Potential of Joining Dissimilar Materials by Cold Formed Pin-Structures - Kraus, Martin; Merklein, Marion (Journal of Materials Processing Technology, 2020)
Joining dissimilar materials brings established joining techniques to their limits due to different thermal expansion, unequal stiffness/strength and chemical incompatibilities. The use of pin-structures has proven an appropriate strategy to join multi-material-systems in laboratory scale. At present, the industrial application of this joining technology is limited due to the time-consuming pin manufacturing process and the inadequately researched achievable joint strengths. In this study, extrusion of the pin-structures from sheet metal is used to investigate an approach that can be directly integrated into existing production processes and does not require auxiliary joining elements. With direct-pin-pressing and caulking, two different joining strategies are analysed to join multi-material systems of sheet steel (DC04, t0 = 2 mm) and aluminium (EN AW 6016-T4, t0 = 2 mm). The basic feasibility of the joining technique is experimentally proven by using single-pin-structures. The joint strength is analysed by tensile shear tests, micro sections and failure patterns. Based on the experimental results, a failure criterion for the joint is defined. Parallel to the experiments, numerical finite element models (FE-models) for the single-pin-joint are developed and validated. In a further step, numerical investigations for multi-pin-structures are carried out in order to derive predictions on achievable joint strengths with this joining technique. It is shown that the form-fit is crucial for the joint strength. Thus, 93 % higher shear strength is achieved for caulked joints. By multi-pin-structures the strength can be increased considerably. For a 5 × 3 pin-structure, shear strength of 9.9 kN can be achieved.
CRIS-Team Scopus Importer:2020-05-22
Keywords: Forming; Joining; Multi-material-system; Pin extrusion

Potential of Joining Dissimilar Materials by Cold Formed Pin-Structures - Kraus, Martin; Merklein, Marion (AJP 2019, 2019)

Potential of Orbital Formed Tailored Blanks for Industrial Application - Hetzel, Andreas; Lechner, Michael; Aman, Alexander; Büdicker, Kai; Merklein, Marion (Steel in Cars and Trucks (SCT), 2022)
Due to economic and ecologic framework conditions like fuel reduction or sustainability, the manufacturing industry is facing greater challenges than ever before. One way to meet these challenges is the combination of lightweight construction and functional integration with an increased material efficiency. Nowadays, components like synchronizer rings or clutch plates are manufactured by machining, producing scrap and thus reducing the efficiency drastically. Orbital forming is an innovative manufacturing process, providing the possibility to efficiently produce functional components with a varying sheet thickness. Thereby, a tumbling motion of the punch reduces the contact area between workpiece and tool, thus enabling a significantly lower process force. The material distribution is realized by a tangential and radial material flow into the cavities. Until now, orbital formed Tailored Blanks have only been investigated as semi-finished products used in a single-stage process combination of deep drawing and upsetting. With regard on the potential for an industrial application, a Tailored Blank layout with different functional elements is introduced. The demonstrator for this investigation is manufactured out of the case-hardenable steel C10 and is depicting a clutch disc carrier with both-sided cyclic as well as rotational-symmetric material thickenings. To evaluate the industrial applicability, the components are analyzed regarding their geometrical and mechanical properties and are compared to the target contour. To demonstrate the operational advantages of the orbital formed components in comparison to conventionally manufactured parts, the fatigue life is evaluated as indicator for the functional behavior.<br
Keywords: Sheet-Bulk Metal Forming; Tailored Blank; Orbital Forming; Endurance Strength; Functional Component; Lightweight Design; Industrial Application

Potential of shear-clinching technology for joining of three sheets - Wiesenmayer, Sebastian; Merklein, Marion (Journal of Advanced Joining Processes, 2021)
The load-specific design of car bodies often requires the joining of more than two sheets. However, due to the additional interfaces and the mutual influence of the joining partners, joining of multi-layer sheets is challenging. This applies for welding technologies and in particular for joining by forming processes, which are often limited by the mechanical properties of the joining partners or require additional fasteners. The shear-clinching technology combines shear-cutting and clinching and therefore allows the joining by forming of high-strength materials without additional fasteners or pre-holing. Yet, the process has only been analyzed for two sheets. Thus, the potential of the technology for joining three sheets is investigated within the scope of this work. Starting from a two-sheet joint with punch-sided AA5182-O and die-sided DP600, the upper and the lower sheet are subsequently replaced by two sheets with half the thickness. The shear-clinching process, the joint formation and the resulting load-bearing capacity are analyzed for the joining of three sheets and compared to the two-sheet reference. Shear-clinching of three sheets with DP600 in the middle and the bottom layer was successfully conducted. Under shear load, the load-bearing capacity is comparable to the two-sheet specimens. However, applying tensile load leads to a two-staged failure of the joint and therefore to lower testing forces. When the force is applied to the top and the bottom layer, the joint strength is distinctly reduced, independent from the load direction.<br
Keywords: Joining; Forming; High-strength steel; Aluminum

Potenziale und Grenzen der Simulation in der Fertigungstechnik - Merklein, Marion; Andreas, Kolja; Gröbel, Daniel; Hildenbrand, Philipp; Müller, Martin; Noneder, Johannes; Zimmermann, Andrea; Schneider, Thomas; Vierzigmann, Ulrich (Tagungsband 15. RoundTable - Simulating Manufacturing, 2014)
LFT Import::2019-08-05 (2021)

Praxisnahe Versagensbeschreibung in der Blechumformung - Vergleich zwischen dem mikromechanischen Schädigungsmodell nach Gurson-Tveergard-Needleman und dem Grenzformänderungsschaubild - Gröbel, Daniel; Rösel, Sebastian; Merklein, Marion; Butz, A. (Umformen, Schneiden, Verbinden im Leichtbau - Machbarkeit - Produktivität - Qualität - Tagungsband T36 des 33. EFB-Kolloquiums Blechverarbeitung am 16. und 17. April 2013 in Fellbach, 2013)
LFT Import::2019-08-05 (1889)

Präzisionslaserstrahlfertigungstechnik für den Maschinenbau - Geiger, Manfred; Hoffmann, Peter (Berichtsband zum FORLAS-Berichtskolloquium am 28.6.1995 in Erlangen, 1995)
LFT Import::2019-08-05 (511)

Präzisionslaserstrahlfertigungstechnik für den Maschinenbau. - Geiger, Manfred; Reinhart, G.; Hoffmann, Peter; Schultz, Markus (Abschlußbericht zum Bayerischen Forschungsverbund Lasertechnik FORLAS., 1997)
LFT Import::2019-08-05 (680)

Precipitation behaviour and mechanical properties during short‑term heat treatment for tailor heat treated profiles (THTP) of aluminium alloy 6060 T4 - Fröck, Hannes; Graser, Matthias; Milkereit, Benjamin; Reich, Michael; Lechner, Michael; Merklein, Marion; Kessler, Olaf (Materials Science Forum, 2017)
Precipitation hardening aluminium alloys are widely used for automotive applications. To enhance the application of aluminium profiles, improved formability is needed. Tailor Heat Treated Profiles (THTP) with locally different material properties attempt to increase formability e.g. in bending processes. Tailoring of local properties is obtained by a local short-term heat treatment, dissolving the initial precipitate state (retrogression) and still allowing subsequent ageing. In the present study, the dissolution and precipitation behaviour of the aluminium alloy EN AW-6060 T4 was investigated during heating with differential scanning calorimetry (DSC). Heating curves from 20 to 600 °C with heating rates of 0.01 up to 5 K/s were recorded. Interrupted heat treatments with different maximum temperatures were performed in a deformation dilatometer. Immediately afterwards, tensile tests were carried out at room temperature. The course of the recorded mechanical properties as a function of the maximum temperature is discussed with regard to the dissolution and precipitation behaviour during heating. Finally, the aging behaviour of the investigated alloy was recorded after different typical short-term heat treatments and is discussed with reference to the DSC‑curves. The correlation of the microstructure and the mechanical properties enables the derivation of optimal parameters for the development of THTP through a local softening.
CRIS-Team Scopus Importer:2023-03-29
Keywords: Differential scanning calorimetry; Dissolution; EN AW-6060; Precipitation; Re-aging; Tailor heat treated profiles (THTP)

Precise Cutting of critical Contour Elements - Geiger, Manfred; Biermann, Stefan; Nuss, Rudolf; Hoffmann, Peter (Conf. on Lasers and Electro-Optics (CLEO 89), 1989)
LFT Import::2019-08-05 (429)

Precise cutting of Sheet Metal with CO2- Laser - Nuss, Rudolf; Biermann, S; Geiger, Manfred (Sheet metal tubes section, 1987)
LFT Import::2019-07-15 (191)

Precise Material Properties as a Prerequisite for FE-Analysis of the Hydroforming of Tailored Welded Blanks - Tolazzi, Massimo; Merklein, Marion (Steel Research International, 2005)
Tailored welded blanks are already used in the series production of deep drawn parts, and are now considered also for other forming technologies, like for example hydroforming. As new materials come into the market, also their combinations in the production of new tailored welded blanks increase, improving on the one hand the possibilities of matching material and functional requirements, but making the material characterisation more difficult on the other hand. For this reason new methods for a fast, precise and flexible characterisation of the mechanical and tribological properties of tailored welded blanks are needed. In particular the FE‐analysis, a powerful instrument for the definition and optimisation of forming processes, needs precise and reproducible material data in order to deliver accurate results. Therefore, when working with tailored welded blanks, it is crucial that the weld line is modelled using mechanical and tribological properties which refer to its structure and surface. This work summarises the methods used for the characterisation of the mechanical properties of the weld line at the chair of manufacturing technology in Erlangen and presents the results obtained for four different steel grades (FeP04, ZStE340, DP450 and TRIP800) and the tailored welded blanks obtained by their combinations. The accuracy of the results obtained in tensile and in friction tests were verified in simple experiments by comparing results from the tests with results from the finite element analysis. These were seen to be in very good accordance, confirming the accuracy of methods used in the material characterisation.
LFT Import::2019-07-16 (1175)
Keywords: Finite element analysis; Friction coefficients; Tailored welded blanks; Tensile test

Precise Positional Adjustments with Laser-Induced Shock Waves - Bechtold, Peter; Roth, Stephan; Schmidt, Michael (Photonics Spectra, 2008)
A micro- and nanoscale adjustment process to achieve precise positioning within defined tolerances has been developed at the Bayerisches Laserzentrum. The adjustment process uses ultrashort laser pulses to induce a microshock wave in the workpiece, resulting in a highly controllable, subnanometer deformation of the piece. This process can be used in different materials, and the interaction mechanism is almost nonthermal. This adjustment process has negligible thermal impact on the workpiece.
LFT Import::2019-07-29 (1520)

Precision Machining of Ceramics with XeCl Excimer Laser Radiation - Geiger, Manfred; Lutz, Norbert (Production Engineering - Annals of the WGP, 1994)
LFT Import::2019-08-05 (599)

Precision of P/M-Parts a System Property - Vollertsen, Frank; Geiger, Manfred (Powder Metallurgy Int. 22, 1990)
It is necessary for determination of the precision of P/M parts to consider the whole system consisting of powder, the compaction press, and sintering furnace. All system parameters such as composition variations, scatter in compaction force and deviations from sintering time and temperature contribute to the final scatter in length, i.e., to dimensional accuracy. It is shown that the green density and the amount of liquid phase are the main factors determining dimensional accuracy after liquid phase sintering. The shape accuracy is primarily determined by friction forces during compaction and sintering and by the slumping effect. It is easier to control dimensional behaviour than the shape of a sintered part. A method is presented to calculate the dimensional accuracy from experimental data in order to find the critical parameters of a given system.
LFT Import::2019-08-05 (740)

Prediction of Damage in Small Curvature Bending Processes of High Strength Steels Using Continuum Damage Mechanics Model in 3D Simulation - Tsoupis, Ioannis; Hildering, Sven; Merklein, Marion (Production Engineering, 2013)
Sheet metal bending of modern lightweight materials like high-strength low-alloyed steels (HSLA) is one major challenge in metal forming, because conventional methods of predicting failure in numerical simulation, like the forming limit diagram (FLD), can generally not be applied to bending processes. Furthermore, the damage and failure behaviour of HSLA steels are changing as the fracture mechanisms are mainly depending on the microstructure, which is very fine-grained in HSLA steels composed with different alloying elements compared to established mild steels. Especially for high gradients of strain and stress over the sheet thickness, as they occur in small curvature bending processes, other damage models than the FLD have to be utilised. Within this paper a finite element (FE) 3D model of small curvature bending processes is created. The model includes continuum damage mechanics model in order to predict and study occurring failure by means of ductile coherence loss of the material and crack formation with respect to influencing process parameters. Damage parameters are determined by inverse numerical identification method. The FE-model is strain based validated considering the deformation field at the outer bending edge of the specimen by using an optical strain measurement system. The Lemaitre based damage model is calibrated against the experimental results within metallographic analysis adapting the identified damage parameters to the bending process und thus adjusting the crack occurrence in experiment and simulation. Using this model the bendability of common HSLA steel, used for structural components, is evaluated with respect to occurring damage and failure by numerical analysis. © 2012 German Academic Society for Production Engineering (WGP).
LFT Import::2019-07-29 (1854)
Keywords: Bending; Continuum damage law; High strength steel; Numerical simulation

Prediction of Service Life and Failure Probability o Cold Forging Tools - Geiger, Manfred; Falk, Bernd (CIRP Annals - Manufacturing Technology, 2001)
LFT Import::2019-07-15 (863)

Prediction of service life of cold forging tools failing by fatigue - Engel, Ulf; Falk, Bernd (Production Engineering, 1999)
LFT Import::2019-07-16 (1994)

Prediction of stochastical failure characteristics of cold forging tool systems - Voelkl, R.; Falk, Bernd (Simulation of materials processing: Theory, Methods and applications, 2001)
LFT Import::2019-07-15 (842)

Prediction of tool life in cold forging - Engel, Ulf; Falk, Bernd (Proceedings of the 2nd ESAFORM Conference on Material Forming, 1999)
None
LFT Import::2019-08-05 (1992)

Presshärten von Tailor Welded Blanks: Werkstoffauswahl, Eigenschaften und Verbindungstechnik - Deinzer, Günter; Stich, A.; Lamprecht, Klaus; Schmid, G.; Rauscher, M.; Merklein, Marion; Lechler, Jürgen (3. Erlanger Workshop Warmblechumformung, 2008)
LFT Import::2019-07-29 (1546)

Pressschweißen von Aluminium-Stahl-Mischverbindungen - Schmid, D.; Neudel, Christian; Zäh, Michael; Merklein, Marion (Lightweight Design, 2012)
LFT Import::2019-07-29 (1824)

Prestressing of cold forging tools for parts with functional elements - Killmann, Martin; Merklein, Marion (XL. Colloquium on Metal Forming, 2022)
An increasing demand for complex part geometries poses challenges to the fatigue strength of cold forging tools. When producing functional elements like gears or carriers, local stress peaks occur in the forging dies. To avoid fatigue failure, an analysis of the stress state and adequate prestressing strategies for non-circular symmetrical cold forging tools are necessary. Therefore, a model process for the closed-die forging of four functional elements is introduced and the resulting stress state analysed numerically. While high compressive stresses and radial displacements are present between the functional elements, there is a tensile stress area with tangential stresses critical for fatigue failure at the head of the functional elements. To counteract this, a local prestressing of functional elements by stress pins is proposed. The pins are pressed into the tool, locally creating radial compressive and tangential tensile stresses. They are well suited for geometries with functional elements, because there are no undesired interactions between pin and process tensile stresses. Even the stress state in tools for more complex part geometries with a higher number of functional elements can be improved that way. However, the height of the local prestressing is still limited by tensile stresses around the pin. <
Keywords: Cold forging; tooling; prestressing; stress pins

Principles for the Heart Treatment Layout of Ultrafine-Grain Aluminium Blanks with Locally Adapted Mechanical Properties - Merklein, Marion; Vogt, Uwe (Proceedings of the COMA 2010, 2009)
EAM Import::2019-03-08

Problem specific design of actuators for micro adjustment - Hagenah, Hinnerk; Wurm, Thomas (Advanced Materials Research, 2005)
Ongoing miniaturisation of functional parts in electronic, optical and mechanical devices results in an increasing demand for precision. By means of laser beam forming of especially designed sheet metal parts within an assembly the needed high accuracy can be reached. The use of the so called actuators, their mounting within the assembly and their activation through laser irradiation are well known steps. The design however is a sophisticated process so far depending on the experience of the designer. It is often determined in a time consuming iterative process. In this paper concepts and methods for an assistance system for the designer of actuator geometries using kinematic chains will be presented.
LFT Import::2019-07-16 (1125)
Keywords: Actuator; Design; Micro adjustment

Proceedings of ceramics with excimer lasers - Lutz, Norbert; Geiger, Manfred (Proceedings of the 3rd European Conference on Laser Treatment of Materials (ECLAT), Erlangen, 1990)
LFT Import::2019-08-05 (737)

Process-adapted temperature application within a two-stage rivet forming process for high nitrogen steel - Kuball, Clara-Maria; Uhe, Benedikt; Meschut, Gerson; Merklein, Marion (Proceedings of the Institution of Mechanical Engineers Part L-Journal of Materials-Design and Applications, 2022)

Process analysis for deep drawing of tailored heat treated blanks - Kerausch, Michael; Merklein, Marion (Proceedings of the 8th International Conference on Technology of Plasticity (ICTP), 09.-13.10., Verona, Italy, 2005)
This paper will summarize the results of a development to improve the forming performance of hardenable aluminum alloys in deep drawing processes. Experimental investigations show the feasibility to change the mechanical properties with a laser heat treatment by influencing the precipitation structure. This enables to manufacture so called Tailored Heat Treated Blanks (THTB) by a local heat treatment. Introducing mechanical property gradients improves the drawing capabilities of THTB significantly relative to homogenous blanks in the naturally aged condition T4. In case that the deformation zone is softened, the maximum drawing force is reduced, while the force transferring area is not affected by the selective heat treatment. Accordingly the total process energy for drawing THTB is lower in comparison to the conventional deep drawing process. As a result the probability of bottom fracture is reduced and a higher drawing ratio can be attained.
LFT Import::2019-08-05 (1220)

Process and Damage Behaviour of High Strength Steels in Shearing Operations - Hildering, Sven; Tsoupis, Ioannis; Merklein, Marion (Tagungsband XXXII. Verformungskundliches Kolloquium, 2013)
LFT Import::2019-08-05 (1879)

Process Chain towards Laminated Object Manufacturing with Metal Foil - Prechtl, Martin; Otto, Andreas; Geiger, Manfred; Graf, D. (LANE 2004, Proceedings of the 4th International Conference on Laser Assisted Net Shape Engineering, 2004)
LFT Import::2019-08-05 (1053)

Process Characterization and Material Flow in Microforming at Elevated Temperatures - Egerer, Emil; Engel, Ulf (Journal of Manufacturing Processes, 2004)
LFT Import::2019-07-16 (1024)
Keywords: Cup Backward Extrusion; Formability; Forming Behavior; Microforming; Micropart; Upsetting; Warm Forming

Process Combination for the Manufacturing of Toothed, Thin-Walled Functional Elements by Using Process Adapted Semi-finished Products - Vogel, Manfred; Schulte, Robert Karl; Lechner, Michael; Merklein, Marion (Springer International Publishing, 2021)
The scientific objective is the analysis of a process combination for the manufacturing of toothed, thin-walled functional elements from process-optimized semi-finished products. By using an upsetting, orbital forming as well as a modified flexible rolling process, tailored blanks with flow-optimized properties are manufactured. In this context, a defined material flow control plays a decisive role for the forming of different geometries. In order to pursue a holistic approach, the process limits as well as the potential of the individual processes are identified. With the application of such blanks, geometrically complex components with functional elements such as gears or carriers are formed in a new combined deep-drawing and upsetting process. The aim is to reduce the number of steps in the process chain and thus save energy and resources. Thereby, different levels of functional integration are taken into account with regard to the geometry and arrangement of the functional elements, but also combinations of both.

Process Control in Laser Beam Cutting and Welding of Car Body Sheets Using a Five-Axes - Geiger, Manfred; Deinzer, Günter; Hoffmann, Peter; Biermann, Stefan (Proceedings of the 32nd International Symposium on Automotive Technology and Automation : ISATA´99 : Automotive Mechatronics Design & Engineering, Croydon, England, 1990)
LFT Import::2019-08-05 (505)

Process design for hydroforming of sheet metal pairs using a closed loop controlled finite element simulation - Kohlbauer, Rainer; Hagenah, Hinnerk; Geiger, Manfred (Proceedings of the 10th International Conference on Sheet Metal, SheMet 2003, 2003)
LFT Import::2019-08-05 (928)

Process design for the forming of semi-tubular self-piercing rivets made of high nitrogen steel. - Kuball, Clara-Maria; Uhe, Benedikt; Meschut, Gerson; Merklein, Marion (Procedia Manufacturing, 2020)
The aim to reduce pollutant emission has led to a trend towards lightweight construction in car body development during the last years. As a consequence of the resulting need for multi-material design, mechanical joining technologies become increasingly important. Mechanical joining allows for the combination of dissimilar materials, while thermic joining techniques reach their limits. Self-piercing riveting enables the joining of dissimilar materials by using semi-tubular rivets as mechanical fasteners. The rivet production, however, is costly and time-consuming, as the rivets generally have to be hardened, tempered and coated after forming, in order to achieve an adequate strength and corrosion resistance. A promising approach to improve the efficiency of the rivet manufacturing is the use of high-strength high nitrogen steel as rivet material because these additional process steps would not be necessary anymore. As a result of the comparatively high nitrogen content, such steels have various beneficial properties like higher strength, good ductility and improved corrosion resistance. By cold bulk forming of high nitrogen steels high-strength parts can be manufactured due to the strengthening which is caused by the high strain hardening. However, high tool loads thereby have to be expected and are a major challenge during the production process. Consequently, there is a need for appropriate forming strategies. This paper presents key aspects concerning the process design for the manufacturing of semi-tubular self-piercing rivets made of high-strength steel. The aim is to produce the rivets in several forming stages without intermediate heat treatment between the single stages. Due to the high strain hardening of the material, a two stage forming concept will be investigated. Cup-backward extrusion is chosen as the first process step in order to form the rivet shank without forming the rivet foot. Thus, the strain hardening effects in the area of the rivet foot are minimized and the tool loads during the following process step can be reduced. During the second and final forming stage the detailed geometry of the rivet foot and the rivet head is formed. In this context, the effect of different variations, for example concerning the final geometry of the rivet foot, on the tool load is investigated using multistage numerical analysis. Furthermore, the influence of the process temperature on occurring stresses is analysed. Based on the results of the investigations, an adequate forming strategy and a tool concept for the manufacturing of semi-tubular self-piercing rivets made of high-strength steel are presente
Keywords: high nitrogen steel; self-piercing riveting; joining by forming; bulk forming; tool design

Process Design of Aluminum Tailor Heat Treated Blanks - Kahrimanidis, Alexander; Lechner, Michael; Degner, Julia; Wortberg, Daniel; Merklein, Marion (Materials, 2015)
LFT Import::2019-07-29 (2141)
Keywords: Lightweight design; Material model; Tailor heat treated blanks

Process Diagnostics for Laser Soldering of Fine-Pitch Components on MIDs - Fröhlich, Thomas; Fleckenstein, Marc (Proceedings of the 3rd International Congress on Molded Interconnected Devices MID 1998, 1998)
LFT Import::2019-08-05 (1377)

Processing of 316L hybrid parts consisting of sheet metal and additively manufactured element by Powder Bed Fusion using a laser beam - Papke, Thomas; Merklein, Marion (Procedia CIRP, 2020)
The approach of 316L hybrid parts consisting of sheet metal with additively manufactured element is investigated regarding relative density, warpage and bonding strength between additively manufactured element and sheet metal. Process parameters for manufacturing hybrid parts with relative density of 99.9 % are identified. Warpage is a critical aspect for hybrid parts, which increases with increasing volume energy density. Regarding a proper part design, knowledge of dependencies of bonding strength is essential. The bonding strength is influenced by relative density of the additively manufactured element and remains on one level for increasing volume energy density.
CRIS-Team Scopus Importer:2020-10-30
Keywords: Additive Manufacturing; Hybrid Part; Part Characterization; PBF-LB/M; Sheet Metal; Stainless Steel

Processing of AISI H11 Tool Steel Powder Modified with Carbon Black Nanoparticles for the Additive Manufacturing of Forging Tools with Tailored Mechanical Properties by Means of Laser Metal Deposition (LMD) - Hentschel, Oliver; Siegel, Laurids; Scheitler, Christian Josef; Huber, Florian; Junker, Daniel; Gorunow, Andrej; Schmidt, Michael (Metals, 2018)

Processing of Aluminium Foam for Lightweight Construction - Geiger, Manfred; Hahn, Markus (Production Engineering, 2003)
LFT Import::2019-07-15 (962)

Processing of Aluminium Foam Sandwich Tailored Blanks - Dörfler, Stephan Manuel; Otto, Andreas; Merklein, Marion; Geiger, Manfred (Proceedings of the Advanced Metallic Materials, 2003)
LFT Import::2019-08-05 (966)

Processing of Aluminium Foam Tailored Blanks - Dörfler, Stephan Manuel; Otto, Andreas; Geiger, Manfred (Cellular Metals - Manufacture, Properties, Applications, 2003)
LFT Import::2019-07-15 (959)

Processing of Compounds and Silica-Layers with an Excimer-Laser-Processing Centre - Geiger, Manfred; Rebhan, Thomas; Lutz, Norbert; Hutfless, Joachim (Proceedings of the EUREKA 205 International Workshop Excimer Laser Applications, 1993)
LFT Import::2019-08-05 (413)

Process-Integrated Component Microtexturing for Tribologically Optimized Contacts Using the Example of the Cam Tappet—Numerical Design, Manufacturing, DLC-Coating and Experimental Analysis - Orgeldinger, Christian; Reck, Manuel; Seynstahl, Armin; Rosnitschek, Tobias; Merklein, Marion; Tremmel, Stephan (Lubricants, 2024)

Process-machine interactions in cold forging – calculation of press / tooling stiffness and its integration into FE process simulation - Kroiß, T.; Völkl, Ralf; Engel, Ulf; Geiger, Manfred (Proc. of the 9th International Conference on Technology of Plasticity (ICTP), 2008)
In this paper a new approach for the calculation of the axial stiffness for the complete system consisting of stroke-controlled press and tooling system in combination with an axially symmetric cold forging process is presented. Two stroke-controlled presses, one with a C-frame, the other in a stiff 4-columns design, were examined both showing a nearly linear behavior. The analyzed example process is full forward extrusion. The stiffness is determined indirectly using the evolution of the workpiece length depending on the actual punch stroke that changes due to the forming load and the resulting deflection. For the stiffness calculation experiments and a FE simulation of the example process are applied. The calculated stiffness was integrated into FE process simulation using a spring element. The comparison between experimental and simulation results shows a very good agreement.
LFT Import::2019-08-05 (497)

Process Mechanics in Friction Stir Welding of Magnesium Alloys: Experimental and Numerical Analysis - Buffa, Gianluca; Fratini, Liven; Gnibl, Tobias; Wieland, Michael; Merklein, Marion (Key Engineering Materials, 2012)
Light weight construction is a major task within automotive and aircraft industry due to lower fuel consumption or increase the possible payload. Structural or exterior shell components are more and more manufactured out of aluminum alloys for this reason. A further weight reduction could be achieved by the substitution of aluminum alloys by magnesium alloys. Also the application of blanks with a varying thickness is a possibility to realize light weight design. To combine the advantages of weight reduction by the use of magnesium alloys and tailored welded blanks (TWBs), an effective joining technique is required. Friction Stir Welding can be used for difficult to be welded magnesium alloys to manufacture magnesium TWBs. During this process the different thickness of the two sheets can cause an unequal heat distribution below the tool, affecting material flow and therefore components strength. In the paper the main results of a numerical and experimental campaign on Friction Stir Welding of AZ31 magnesium alloy tailored blanks are presented. The numerical simulation was validated by experimental observations and the occurring bonding conditions have been analyzed in both approaches.© (2012) Trans Tech Publications.
LFT Import::2019-07-29 (1778)
Keywords: Friction stir welding; Material flow; Numerical simulation; Tailored welded blanks

Process model for the design of bent 3-dimensional free-form geometries for the three-roll-push-bending process - Vatter, Peter; Plettke, Raoul (Procedia CIRP, 2013)
LFT Import::2019-07-29 (1851)
Keywords: 3D; FE; Free-form bending; Process design; Three-roll-push-bending

Process Modeling in Cold Forging Considering Process Machine Interactions and Scatter of Influencing Factors - Kroiss, Thomas (Proc. 4th Form. Technol. Forum, 2011)
LFT Import::2019-08-05 (1729)

Process Modeling In Cold Forging Considering The Process-Tool-Machine Interactions - Kroiss, Thomas; Engel, Ulf; Merklein, Marion (Proc. of the 10th Int. Conf. on Numerical Methods in Industrial Forming Processes; AIP Conference Proceedings 1252, 2010)
In this paper, a methodic approach is presented for the determination and modeling of the axial deflection characteristic for the whole system of stroke-controlled press and tooling system. This is realized by a combination of experiment and FE simulation. The press characteristic is uniquely measured in experiment. The tooling system characteristic is determined in FE simulation to avoid experimental investigations on various tooling systems. The stiffnesses of press and tooling system are combined to a substitute stiffness that is integrated into the FE process simulation as a spring element. Non-linear initial effects of the press are modeled with a constant shift factor. The approach was applied to a full forward extrusion process on a press with C-frame. A comparison between experiments and results of the integrated FE simulation model showed a high accuracy of the FE model. The simulation model with integrated deflection characteristic represents the entire process behavior and can be used for the calculation of a mathematical process model based on variant simulations and response surfaces. In a subsequent optimization step, an adjusted process and tool design can be determined, that compensates the influence of the deflections on the workpiece dimensions leading to high workpiece accuracy. Using knowledge on the process behavior, the required number of variant simulations was reduced. © 2010 American Institute of Physics.
LFT Import::2019-08-05 (499)
Keywords: Cold Forging; Press Deflection; Process Modeling; Process-Tool-Machine Interactions

Process Modelling of Laser Ablation Ferrous Materials - Schubart, Doris; Vollertsen, Frank; Kauf, Michael; Geiger, Manfred (Proc. of the EuroLaser Academy, 1995)
LFT Import::2019-08-05 (575)

Process Optimizing Adaptive Optics for the Beam Delivery of High Power CO2 Lasers - Hoffmann, Peter; Schuberth, Stefan; Geiger, Manfred (Proc. of the Conf. OE/Technology 92, Nr. 1834, 1992)
LFT Import::2019-08-05 (484)

Process Optimizing CO2-Laser Beam Welding Using Adaptive Optics - Geiger, Manfred; Schuberth, Stefan; Hoffmann, Peter; Hutfless, Joachim (CO2-Laser Beam Welding Using Adaptive Optics, 1994)
LFT Import::2019-07-15 (603)

Process-Oriented Adaptation of Laser Beam Brazing to Production Techniques - Geiger, Manfred; Hanebuth, Henning; Hoffmann, Peter (Production Engineering, 1995)
LFT Import::2019-07-15 (543)

Process-oriented validation of hardening models in a cyclic bending test - Rosenschon, Martin; Merklein, Marion (International Conference on the Technology of Plasticity, ICTP 2017, 17-22 September 2017, Cambridge, United Kingdom, 2017)
None
LFT Import::2019-08-05 (2273)
Keywords: Kinematic hardening; Metal forming; Modelling

Process parameter interaction in microforming - Eichenhüller, Bernd; Engel, Ulf; Geißdörfer, Stefan (Proceedings of the 11th ESAFORM2008 conference on material forming, 2008)
Microforming processes, size effects and the influence of distinctive parameters on the forming process are been investigated for a long time. This paper presents some results of parameter interactions influencing the microforming process. The effects and interactions of five selected parameters are investigated for a full backward extrusion of small pins by means of a full factorial experimental design. The temperature-pin diameter interaction is used to give an example of an obvious and significant parameter interaction. © Springer/ESAFORM 2008.
LFT Import::2019-08-05 (326)
Keywords: Cu-ETP; Microforming; Parameter interaction; Size effects

Process parameters optimisation in sheet hydroforming - Tolazzi, Massimo; Geiger, Manfred (Innovation in Metal Forming, 2004)
LFT Import::2019-07-16 (1077)

Process Strategies for Sheet Metal Hydroforming of Lightweight Components - Geiger, Manfred; Vahl, Meik; Novotny, Stefan; Bobbert, S. (Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 2001)
LFT Import::2019-07-15 (832)
Keywords: Aluminium; Elevated temperature; Finite element simulation; Hydroforming; Magnesium; Process control; Sheet metal forming

Product Development of an Oil Level Sensor - Advantages of Laser Technology - Eßer, Gerd; Schultheis, H. (Proceedings of the 4th International Congress on Molded Interconnect Devices - MID 2000, September 27-28, Erlangen, 2000)
LFT Import::2019-08-05 (755)

Production and analysis of electrically conductive polymer – Carbon-black composites for powder based Additive Manufacturing - Düsenberg, Björn; Tischer, Florentin; Seidel, Anne Marie; Kopp, Sebastian-Paul; Schmidt, Jochen; Roth, Stephan; Peukert, Wolfgang; Bück, Andreas (Procedia CIRP, 2022)
In laser powder bed fusion, micro-particles are selectively fused by a laser to produce parts, layer-by-layer. While this process offers a high freedom of design, the variety of commercially available materials, especially composites are limited. Conductive polymers blends, are very interesting for many applications, especially as sensors with freely definable shape. First, the amount of carbon-black needed to make the composite electrically conductive has to be determined; this limit is called percolation threshold (PT). The PT depends on many properties, such as particle size and shape of both polymer and carbon-black and will be determined experimentally. In this work, polypropylene is dry mixed with different types of micron sized carbon blacks. The PT and the conductivity is determined by means of impedance spectroscopy. Finally, layers are printed to evaluate the processability of the new composite.<br
Keywords: polypropylene; carbon black; percolation threshold

Production of Cams by a P/M Route. - Vollertsen, Frank; Engel, Ulf (Powder Metallurgy International, 1992)
The production of cams for an integral camshaft by means of powder metallurgical methods is described. The problems of strength, wear resistance, working accuracy (especially carbon control) and production costs are discussed. The choice of an alloy which contians no expensive elements is essential for the reduction of production costs. For wear resistance not only the properties under normal lubrication but also the emergency running properties have to be taken into account.
LFT Import::2019-07-16 (1966)

Production of gears by cold forging - Zimmermann, Andrea; Engel, Ulf; Merklein, Marion; Neher, R. (Int. Conf. on Gears, VDI-Berichte 2199.2, 2013)
LFT Import::2019-08-05 (1917)

Production of Microparts by Cold and Warm Forming - Engel, Ulf; Egerer, Emil; Geiger, Manfred (Proceedings of the CIRP Seminar on Micro and Nano Technology, 2003)
LFT Import::2019-08-05 (941)

Produktionsentstehung eines ölstandssensors in MID-Technik: Vorteile der Laserstrukturierung - Eßer, Gerd; Müller, Joachim (Fachseminar - Innovative Produktgestaltung mit MID, 18.01. und 05.04., 2001)
LFT Import::2019-08-05 (880)

Produktionsmanagement als effizientes Werkzeug zur Vernetzung von Forschungsprojekten - Ziegler, Christian; Stockinger, Andreas; Stoll, Tobias; Wittmann, Stefan; Weickmann, Johannes; Schmidt, Jürgen; Schuck, Marcus; Cojutti, Massimo; Al-Sheyyab, Ahmad (Zeitschrift für wirtschaftlichen Fabrikbetrieb, 2007)
LFT Import::2019-07-16 (1501)

Profilbiegen mit kinematischer Gestalterzeugung - Arnet, Horst (Friedrich-Alexander-Universität Erlangen-Nürnberg, 1999)
As part of the work, a new profile bending process was developed, in which the profiles are pressed into an elastic polyurethane matrix by means of a bending roller and can thus be flexibly bent using defined tool relative movements between the roller and the matrix. Due to the kinematic design and the associated flexibility, the developed technology is particularly suitable for the generation of variable curvature curves that vary over the profile length for small to medium lot sizes. The basic investigations carried out show a strong dependence of the locally achieved curvature on the respective immersion depth, on the cross-sectional geometry and on the material properties of the profile, on the current profile contour in the area of the contact surface of the profile on the die and on the position on the die. Only knowledge of the real position of the strain-free fiber in the profile creates the prerequisite for an assignment between profile and tool coordinates, which is required for process control. Alternatively, the method of finite elements or neural networks can be used to calculate the required tool relative movements. Both approaches were implemented, implemented in the planning system and verified experimentally. Using the example of producing a frame structure from curved profiles, it was demonstrated how a new bending task can be realized in a short time by using the flexible technology and the developed planning metho

Profilbiegen mit Polyurethanmatrize - Prozeßführung und Formgebungsmöglichkeiten. - Geiger, Manfred; Arnet, Horst; Vollertsen, Frank (Blech, Rohre, Profile, 1996)
LFT Import::2019-07-15 (634)

Prognose der mechanischen Bauteileigenschaften bei Presshärtprozessen anhand mikrostruktureller und umformtechnischer Zusammenhänge - Springer, R.; Lechler, Jürgen; Stöhr, Thomas; Karbasian, H.; Schaper, M.; Merklein, Marion; Brosius, A.; Tekkaya, A.E. (Tagungsband 3. Erlanger Workshop Warmblechumformung, 2008)
LFT Import::2019-08-05 (196)

Projektübergreifende Zusammenarbeit im Arbeitskreis 1 des Forschungsverbunds ForWerkzeug - Wagner, Kay; Hagemann, F.; Tomic, D. (Der Schnitt- & Stanzwerkzeugbau, 2007)
LFT Import::2019-07-16 (1486)

Properties of Tool Steels for Application in Hot Stamping - Niederhofer, Philipp; Eger, Kathrin; Schwingenschlögl, Patrik; Merklein, Marion (Steel Research International, 2019)
Hot stamped high-strength steel components for car bodies become increasingly important due to the need to save weight for multiple reasons such as fuel conservation regulations. Tribological systems in tools for hot stamping depend on process parameters and may include, e.g., mechanical and thermal loads as well as adhesive and abrasive wear. Furthermore, the process cycle time should be as short as possible due to economic reasons. Commonly used hot work tool steels mainly suffer from rather low wear resistance, whereas in terms of process cycle time, a high thermal conductivity is desired. Thus, solutions showing optimized combination of key properties for application in hot stamping such as wear resistance, high thermal conductivity, toughness, and hardening behavior need to be found. In this contribution, novel high thermal conductivity hot work tool steels, especially designed for application in hot stamping, are presented and some key properties are compared, e.g., to those of conventional hot work tool steels like 1.2367, which is commonly used in this application. Furthermore, tribological investigations are performed in laboratory tests according to ASTM G65 and G75 as well as a flat strip-drawing test setup using sheets of 22MnB5 under hot stamping conditions.
CRIS-Team WoS Importer:2019-12-10

Proprietà meccaniche di una tecnologia di giunzione innovativa tipo shear-clinching per strutture leggere automobilistiche in acciaio ad altissima resistenza e leghe di alluminio - Hörhold, Réjane; Müller, Martin; Merklein, Marion; Meschut, Gerson (Rivista Italiana della Saldatura, 2017)
Comfort- And safety-related requirements lead to weight increase of automotive structures. Modern constructions in automotive body in white (BIW) production confront this upward weight spiral with multi-material design. This restricts conventional thermal joining technologies. The basic idea of mechanical joining technologies is a force- And formfitting joint. Clinching technologies create a joint only by plastic deformation. The formability of the joining partners limits this technology, especially when joining ultra-highstrength steels (UHSS) in multi-material design. State of the art to realise this is multistage clinching with pre-hole. Industrial applications in BIW are, e.g. the brackets for mouldings in the upper windscreen frame of Daimler's S-class and the battery holder of Daimler's M-class. Innovative shear-clinching enables joining by forming hot formed UHSS and ductile aluminium in a single-stage process. The spherical punch-sided tool set prevents any harm of the punch-sided ductile material. The cutting die initialises a crack in the die-sided material with limited formability. This paper presents detailed studies on the mechanical behaviour of state of the art multi-stage clinching with cylindrical and tapered pre-hole under quasistatic and fatigue testing methods to evaluate the influence of the interlock. These results were compared to the single-stage shear-clinching technology to derive further recommendations.
CRIS-Team Scopus Importer:2023-03-29
Keywords: Aluminium alloys; High strength steels; Laboratory for material and joining technology; university of paderborn; paderborn; germania.; vehicle bodies; Mechanical fastening; Nonwelded joints

Prototype Manufacturing of Helical Needles for Suture in Deep Wound Cavities - Plettke, Raoul; Vipavc, Daniel; Grüner, Martin; Hagenah, Hinnerk; Merklein, Marion (Proc. 1st Int.Conf. Design and Processes for medical devices PROMED, 2012)
LFT Import::2019-08-05 (1837)

Prototypen und Kleinserien in der Umformtechnik - Potenziale und Herausforderungen für die Zukunft - Eßer, Gerd (Blech, Rohre, Profile, 2000)
LFT Import::2019-07-15 (754)

Prozessangepasste Lösungen für den Einsatz von Leichtbauwerkstoffen in der Blechumformung - Celeghini, Martino; Kerausch, Michael; Kreis, Oliver; Merklein, Marion; Geiger, Manfred (Robuste, verkürzte Prozessketten für flächige Leichtbauteile. Tagungsband zum Industriekolloquium 2003 des SFB 396, Erlangen, 15.-16.10, 2003)
LFT Import::2019-08-05 (960)

Prozessfenster zur Verarbeitung alternativer Stahlgüten im Presshärtprozess - Merklein, Marion; Svec, Thomas (7. Erlanger Workshop Warmblechumformung, 2012)
LFT Import::2019-08-05 (1841)

Prozessgrundlagen für die Halbwarmumformung - Neugebauer, R.; Geiger, Manfred; Hartwig, H.; Bitter, Stefan (Tagungsband der Konferenz Neue Entwicklung in der Massivumformung, 2003)
LFT Import::2019-08-05 (953)

Prozeßinnovationen durch den Einsatz prozeßoptimierender Optiken - Geiger, Manfred; Hoffmann, Peter; Schuberth, Stefan (Bericht zum Laser 93 -Fachseminar Prozeßoptimierende adaptive Optiken, 1993)
LFT Import::2019-08-05 (407)

Prozesskettenverkürzung in der Blechumformung - Merklein, Marion; Geiger, Manfred; Blankl, Andreas; Cojutti, Massimo; Vogt, Uwe (Robuste, verkürzte Prozessketten für flächige Leichtbauteile. Tagungsband zum Industriekolloquium des SFB 396, 2006)
LFT Import::2019-08-05 (1283)

Prozeßkontrolle beim Laserstrahl-Mikroschweißen - Brassel, Jan-Oliver (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2002)
The content of the thesis aims at the creation of ready-to-use technology solutions which bring about an increase in both technical availability and welding quality for industrially used Nd: YAG laser micro-welding systems. For this purpose, a new, multisensory diagnostic system for beam guidance and shaping was developed. Based on trained neural networks and fuzzy technology, robust tools for automatic process monitoring and process control could then be created. The final development of solutions for online control of the micro-welding process ensures that the error rate is minimized and that the depth of the weld seam is sufficient for the single pulse lap join

Prozeßkontrolle und -steuerung beim Laserstrahlschweißen mit den Methoden der nichtlinearen Dynamik - Geisel, Mark (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2002)
A new process control for laser welding applications is introduced. This method, known as resonant stimulation, effects the laser welding process by small laser power modulations which result in an increased weld seam quality. A systematic approach for the determination of suitable control parameter is explained on the basis of the transfer function of the laser welding proces

Prozeßmodellierung und Technologieentwicklung beim Abtragen mit CO2-Laserstrahlung - Schubart, Doris (Friedrich-Alexander-Universität Erlangen-Nürnberg, 1999)
The aim of the investigations of this work was to improve the process efficiency in laser beam ablation for the production of molds and dies by progress in process control. Three strategies were offered to solve this task. The two removal mechanisms, oxide chips and melt removal, had to be qualified separately, or coordinated efficiently in a two-stage process. Based on the qualitative modeling of the interaction mechanisms of the sub-processes oxide chipping and melt removal, technological improvements were theoretically developed and verified in the course of this process development. For the melt removal, the feasibility of the required technological targets was demonstrated using an in-house developed removal nozzle as well as the demonstration of completely new possibilities for increasing efficiency. Accordingly, the resonant excitation by means of focus position oscillation during melt removal, in addition to a clear process stabilization, causes the defined and reproducible structuring of the workpiece surface. From this, on the one hand, the need for further basic scientific investigations (Nonlinear Dynamics) and, on the other hand, the technological potential in tribological structuring applications can be derive

Prozessorientierte Werkstoffcharakterisierung für die numerische Auslegung von Blechumformperationen - EFB-Forschungsbericht Nr. 484 - Merklein, Marion; Lenzen, Matthias; Brosius, Alexander; Kuesters, Niklas (Europäische Forschungsgesellschaft für Blechverarbeitung e.V., 2018)
Die realitätsnahe Abbildung des Werkstoffverhaltens ist ein wichtiger Aspekt der numerischen Prozessauslegung mit Hilfe der Finiten-Element-Methode. Mit den Werkstoffen AA5182, AA6016, DC06, DX54 sowie DP600 werden ein tiefziehdominierter Kreuznapf und ein streckziehdominierter Stützträger numerisch und experimentell untersucht. Die entwickelte Parameteridentifikation verbessert die Abbildungsgenauigkeit für Stahlwerkstoffe, die in Versuchen einen stark umformgradabhängigen Verlauf der Anisotropie aufweisen. Zur Bewertung werden die Größen Blechdickenverteilung und Flanscheinzug herangezoge
Keywords: Werkstoffcharakterisierung; Blechumformung

Prozeßsicherung durch magnetinduktive überwachung mechanischer Blecheigenschaften. - Schwind, Michael; Engel, Ulf (Blech, Rohre, Profile, 1994)
LFT Import::2019-07-16 (1973)

Prozesstechnische Untersuchungen zum Rührreibschweißen metallischer Werkstoffe - Giera, Artur (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2008)
The presented work exhibits friction stir welding as an innovative welding technique for similar and dissimilar materials as steel and aluminium in sheet thicknesses of about 1 mm. By welding in the solid phase hot cracks, inclusions or blowholes are completely avoided. This enables on the one hand high quality assemblies regarding the technical requirements and on the other hand cost efficient the assemblies as subsequent machining is unnecessar

Pulvermetallurgische Herstellung und Eigenschaften verschleißfester Bauteile - Vollertsen, Frank; Engel, Ulf; Leithner, K.;; Geiger, Manfred; Geiger, R. (Metall, 1989)
LFT Import::2019-07-15 (441)

Pulvermetallurgische Verarbeitung eines übereutektoiden verschleißfesten Stahls - Vollertsen, Frank (Friedrich-Alexander-Universität Erlangen-Nürnberg, 1990)
Bei der pulvermetallurgischen Herstellung von Massenformteilen stellen die Werkstoffkosten einen wesentlichen Faktor für die Gesamtkosten eines Produkts dar. In dieser Arbeit wurde daher ein kostengünstiger Werkstof

Qualification of a new test for wear investigation on coated tools - Schrader, Tobias; Merklein, Marion; Engel, Ulf (Proc. 4th Int. Conf. on Tribology in Manufacturing Processes (ICTMP), 2010)
LFT Import::2019-08-05 (203)

Qualification of Laser Based Additive Production for Manufacturing of Forging Tools - Junker, Daniel; Hentschel, Oliver; Schmidt, Michael; Merklein, Marion (Journal of Manufacturing Review, 2015)
Mass customization leads to very short product life cycles, so the costs of a tool have to be amortized with a low number of workpiecesEspecially for highly loaded tools, like those for forging, that leads to expensive productsTherefore more economical production processes for tool manufacturing have to be investigatedAs laser additive manufacturing is already used for the production of moulds for injection moulding, this technology maybe could also improve the forging tool productionWithin this paper laser metal deposition, which is industrially used for tool repair, will be investigated for the use in tool manufacturingTherefore a mechanical characterization of parts built with different laser process parameters out of the hot work tool steel 1.2709 is made by upsetting tests and hardness measurementsSo the influence of the additive manufacturing process on the hardness distribution is analysed
LFT Import::2019-08-05 (2110)

Qualifizierung des Potentials von Verfestigungseffekten zur Erweiterung des Umformvermögens aushärtbarer Aluminiumlegierungen - Nguyen, Manh Hung (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2015)
High strength aluminum alloys are essential for the lightweight construction of present car models. Due to its high strength characteristics these alloys show a low forming behavior. The present work focuses the effects of precipitation hardening of close to series 6xxx-series aluminum alloys. With respect to the developed working principles of the local hardening the user is able to create an optimized properties distribution of the sheet metal and therefore to enhance the formability of the part. The risk of failure falls and the effective costs sinks due to reduced scrap as well raising the productivity of the manufacturing of the car body par

Qualifizierung einer Prozesskette zum Laserstrahlsintern metallischer Bauteile - Niebling, Frank (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2005)
lnvestigation of the temperature- and stress field at laser sintering of metal parts. A two step process - laser sintering at low area energies followed by an infiltration - is usually faster and more economical than the conventional laser sintering process. Additionally the process stability at laser sintering was improved by an optimisation of the process parameter

Qualifizierung laser-additiv gefertigter Komponenten für den Einsatz im Werkzeugbau der Massivumformung - Junker, Daniel (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2021)
Shortened product life cycles and a raised degree of customization require an increased use of flexible manufacturing processes for production. Due to this, additive manufacturing technology is constantly gaining significance within production. Therefore, in this thesis the possibility of using laser-based additive manufacturing processes in toolmaking for bulk metal forming is investigated. The focus is on the resulting material properties, as these are significant for use in toolmaking. In particular, the behavior under tensile and compressive loads as well as the hardness are analyzed. The corresponding structure is identified by using microscopy. The analyzed structures are manufactured by Laser Beam Melting in powder bed and Laser Metal Deposition welding. Furthermore, the influence of a post-heat-treatment is part of the investigations. Based on the results, the potential of additive manufacturing for toolmaking for bulk metal forming is derived and the use of an additively manufactured tool is proven for a selected production sequence through use in serial productio

Qualität des Laserschnitts - Biermann, Stefan; Nuss, Rudolf; Geiger, Manfred (Maschinenmarkt, 1988)
LFT Import::2019-07-15 (268)

Qualitätsmanagement komplexer Verbundforschungsprojekte - Al-Sheyyab, Ahmad; Blankl, Andreas; Leitz, Karl-Heinz; Vogt, Uwe; Weickmann, J.; Wittmann, Stefan (QZ Qualität und Zuverlässigkeit, 2007)
LFT Import::2019-07-16 (1446)

Qualitätssicherung im Werkzeugbau: Messung der Werkzeugvorspannung mittels Ultraschall - Putz, Alexander; Popp, Uwe; Engel, Ulf (wt Werkstattstechnik - Online, 2004)
LFT Import::2019-07-16 (1063)

Qualitätssicherung in der Blechberarbeitung - magnetinduktive Überwachung der mechanischen Blechkennwerte - Schwind, Michael; Engel, Ulf; Geiger, Manfred (Blech, Rohre, Profile, 1993)
LFT Import::2019-07-15 (446)

Qualitätssicherung in der Laserstrahlschweißtechnik - Hoffmann, Peter; Deinzer, Günter; Geiger, Manfred (Blech, Rohre, Profile, 1992)
LFT Import::2019-07-15 (483)

Quality Control during Excimer Laser Material Processing - Geiger, Manfred; Lutz, Norbert; Rebhan, Thomas; Hutfless, Joachim (Proceedings of Gas Flow and Chemical Lasers, 1993)
LFT Import::2019-07-15 (411)

Quality determining variables at friction stir welding of the aluminium alloy EN-AW 6082 - Klausecker, Roland; Otto, Andreas; Dörfler, Stephan Manuel (Advanced metallic materials and their joinig, 25.-27.10.2004, Bratislava, Slovakei, 2004)
LFT Import::2019-08-05 (1087)

Randerscheinungen rücken ins Zentrum - Diehl, Alexander; Engel, Ulf; Geiger, Manfred (Mikroproduktion, 2005)
LFT Import::2019-07-16 (1238)

Rapid Prototyping für Aluminium-Bleche - Geiger, Manfred; Vollertsen, Frank (VDI-Berichte, 1994)
LFT Import::2019-07-15 (605)

Rapid Prototyping in Profile Forming by Means of Laser-Inducted Thermal Stresses - Geiger, Manfred; Kraus, Jürgen; Hoffmann, Peter; Vollertsen, Frank (Rapid Prototyping in the Automative Industries, Proc. Of the 28th ISATA, 1995)
LFT Import::2019-08-05 (557)

Rapid Prototyping of Ceramic Parts by Selective Laser Curing - Sindelar, T.; Buhler, P.; Niebling, Frank; Otto, Andreas; Greil, Peter (Shaping II, Second International Conference on Shaping of Advanced Ceramics, 2002)
LFT Import::2019-08-05 (1704)

Rapid Prototyping von keramischen Bauteilen: Der SLC-Prozess - Niebling, Frank; Sindelar, R.; Otto, Andreas; Prechtl, Martin; Travitzky, N.; Geiger, Manfred; Greil, Peter (Keramik im Fahrzeugbau, 2003)
LFT Import::2019-07-15 (938)

Rapid tooling beim IHU - Prier, M.; Engel, B.; Geiger, Manfred; Celeghini, Martino (7. Forum Innenhochdruckumformen. Darmstadt, 2001)
LFT Import::2019-08-05 (915)

Rapid Tooling by Laminated Object Manufacturing of Metal Foil - Prechtl, Martin; Otto, Andreas; Geiger, Manfred (Advanced Materials Research, 2005)
The technology of Laminated Object Manufacturing (LOM) is not very new. For hundreds of years wooden parts are built by stacking layers together. Nowadays also paper, plastic, ceramic composite and metal sheets are treated in layers. For the manufacture of prototypes and especially technical tools, e. g. moulds for gravity casting, die casting or injection molding, out of metallic foil however the low self stiffness of this material is a great challenge. In this case it is useful to produce the parts in a two step process. The first subprocess is the stacking of the layers, which can be realised by laser beam spot welding to determine the position of the layer in combination with generating the defined contour by a laser beam cutting process. This procedure is done in a fully automated machine where the CAD-file of the desired part and the building parameters like the laser parameters and the cutting velocity are needed as input. However the stability of the produced green part is insufficient for most kind of application. Hence, a second sub-process to enhance the mechanical properties of the part is necessary. This can for example be realised by high temperature soldering or by diffusion welding in a furnace with inert gas or vacuum. During these kinds of joining processes the green part is homogeneously pressed with the help of a powder bed and at the same time it is tempered for a defined term. In this paper the principle of sheet metal LOM is described as well as the process chain of Laminated Object Manufacturing of metal foil. For each sub-process of metal foil LOM the results of the experimental work for qualifying and optimizing the sub-process are shown. Finally some examples of possible applications especially in the field of Rapid Tooling and Rapid Manufacturing are discussed.
LFT Import::2019-07-16 (1245)
Keywords: Diffusion welding; Laser cutting; Laser welding

Rapid tooling - Current Status and Future Trend - Eßer, Gerd; Niebling, Frank; Geiger, Manfred (Proceedings of the 3rd International Conference on Industrial Tools (ICIT 2001), 23.-26. April Slatina, Celje, Slowenien, 2001)
LFT Import::2019-08-05 (858)

Realisierung schmierstofffreier Tiefziehprozesse durch maßgeschneiderte Werkzeugoberflächen - Tenner, Jennifer (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2019)
Since lubricants and cleaning detergents contain environmentally harmful substances and lead to longer process chains due to the necessity of lubricating and cleaning of formed parts the scope of this work was the realization of dry deep drawing. Motivated by the ecological and economical potentials of lubricant free forming, the consequences of the abandonment of lubricants were analyzed in forming tests with a zinc coated deep drawing steel and two aluminum alloys. Especially the direct contact of aluminum alloys with the tools led to wear and damage on the sheet surfaces due to an increased friction and adhesion tendency. In order to reduce friction, the tool surfaces were finished with different strategies and coated with varying amorphous carbon based coatings. Several strip drawing and dry deep drawing tests revealed that a low tool roughness leads to beneficial tribological behavior independent from the sheet material. However, a tungsten doping of the coatings results in increased tool wear. The influence of laser generated micro structures depends on their depths and degree of coverage. Tribological correlations were analyzed under dry conditions and it was shown that dry deep drawing can be realized depending on the properties of the contact partners and the selected surface modification

Recent Developments in Laser System Technology for Welding Applications - Hoffmann, Peter; Geiger, Manfred (CIRP Annals - Manufacturing Technology, 1995)
Further spreading of laser welding technology essentially needs an improvement of the reliability of the welding systems and an enlargement of applicability even at complicated workpiece structures. With this paper measures are proposed in order to meet these goals: - stabilization of the laser source by a closed loop control of the laser power - optimization of the laser beam guiding and forming by use of Adaptive Optics. © 1995 CIRP.
LFT Import::2019-07-15 (565)
Keywords: laser; quality assurance; welding

Rechnergestützte Anpassung von Laserstrahlschneidbahnen an Bauteilabweichungen - Kach, Andreas (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2004)
Usually offline-programmed machining paths for laser cutting of complex-shaped parts have to be corrected manually in the prototype manufacture. The correction is sometimes necessary because the actual workpiece’s geometry differs from the nominal geometry used in offline-programming systems. For this reason the Dr.-Thesis develops a method for·computer-aided adaptation of machining paths for laser cutting to workpiece deviation

Rechnergestützte Fertigungsvorbereitung für komplexe Blechbiegeteile - Geiger, Manfred; Geißler, Uwe; Hoffmann, Martin (CIM-Management, 1990)
LFT Import::2019-07-15 (724)

Rechnergestützter Entwurf von Aktorsystemen für die lasergebundene Mikrojustage - Plettke, Raoul; Hagenah, Hinnerk; Geiger, Manfred (Simulation und Visualisierung 2007. Proceedings of the 18th Conference on Simulation and Visualization (SimVis), 2007)
LFT Import::2019-08-05 (139)

Rechnergestützte Werkzeugplanung für Blechbiegeteile - Geiger, Manfred; Franke, Volker (Blech, Rohre, Profile, 1995)
LFT Import::2019-07-15 (538)

Reduzierung der Durchflußmengenstreuung laserstrahlerzeugter Bohrungen - Geiger, Manfred; Hoffmann, Peter; Bartl, Norbert; Schmidt-Hebbel, Robert (Abtragen und Bohren mit Festkörperlasern, 1993)
LFT Import::2019-07-15 (405)

Regelung der Fokuslage beim Schweißen mit CO2-Hochleistungslasern unter Einsatz von adaptiven Optiken - Schuberth, Stefan (Friedrich-Alexander-Universität Erlangen-Nürnberg, 1998)
The aim of the work was the development of a control system for the process-optimized tracking of the focus position during laser beam welding and the verification of the functionality on a commercial laser system. With the optomechanical component used, the adaptive optics, it was possible for the first time to bring about highly dynamic changes in the focus position axially to the workpiece surface, to establish the correlation with the plasma signal and to derive an innovative control strategy. For the control concept, the laser-induced plasma is recorded using plasma diagnostics, used as a measurement variable and processed in a digital signal processor system in order to calculate the control variable “focus position” for actuating the actuator. The strong plasma fluctuations and the complex influence of the process parameters on the plasma signal during laser beam welding make it necessary to use a new control principle, which allows a reliable extraction of the focus position. This control principle is based on an on-line focus position detection developed in the context of this thesis, which ensures process control by the high dynamics of the actuator and the evaluation of the modulation in the plasma signa

Reibrührschweißen - Innovativ in der festen Phase verbinden - Geiger, Manfred; Merklein, Marion; Giera, Artur (Zeitschrift für wirtschaftlichen Fabrikbetrieb, 2005)
LFT Import::2019-07-16 (1241)

Reibungsreduzierung in EHD-Kontakten durch mikrostrukturierte Bauteiloberflächen - Auslegung, Gestaltung und umformtechnische Herstellung - Tremmel, Stephan; Marian, Max; Zahner, Michael; Weschta, Martin; Engel, Ulf; Wartzack, Sandro; Merklein, Marion (58. Tribologie-Fachtagung. 2017, Son-derband Abschlusskolloquium „Ressourceneffiziente Konstruktionselemente“ SPP 1551 der DFG, 2017)
Gezielt eingebrachte, definierte Oberflächenmikrostrukturen bieten in elastohydrodynamischen (EHD) Kontakten Potential zur Reibungsreduzierung und können damit die Energieeffizienz technischer Systeme erhöhen. Um die größtmögliche Wirksamkeit zu erreichen, sind diese Oberflächenmikrostrukturen auf die jeweilige Anwendung abzustimmen. Die Realisierung theoretisch genauer Mikrostrukturen ist zudem durch die Fertigungstechnik limitiert. Des Weiteren bestimmt das Verschleißverhalten der Mikrostrukturen im Einsatz die Bauteillebensdauer. Für einen wirksamen Einsatz über den gesamten Produktlebenszyklus hinweg bedarf es somit eines grundlegenden Verständnisses der Zusammenhänge zwischen Gestaltung, Herstellung und Einsatzverhalten oberflächenstrukturierter Bauteile. Vor diesem Hintergrund werden im vorliegenden Beitrag ein Simulationsansatz zur Untersuchung der Wirkweise von Oberflächenmikrostrukturen vorgestellt sowie eine Methodik abgeleitet, die die systematische Auslegung und Gestaltung von Oberflächenstrukturen erlaubt. Die Methodik erlaubt die Berücksichtigung individueller tribologischer Belastungskollektive und fertigungstechnischer Restriktionen. Die Fertigungsrestriktionen bei der Strukturerzeugung wurden im Hinblick auf industrielle Maßstäbe für einen Mikroprägeprozess ermittelt. Auf Basis tribologischer Untersuchungen auf einem Nocken/Stößel-Komponentenprüfstand erfolgt die Beurteilung des Reibungs- und Verschleißverhaltens der mikrostrukturierten Bauteil
LFT Import::2019-08-05 (2259)
Keywords: Elastohydrodynamik; Mikrostrukturen; Mikroprägen

Relevanzanalyse zur Berücksichtigung der kinematischen Verfestigung in Tiefziehprozessen mit geschlossenem Profil - Lafarge, Rémi; Ahmed, Usama; Brosius, Alexander; Lenzen, Matthias; Jäckisch, Manuel; Merklein, Marion (Europäische Forschungsgesellschaft für Blechverarbeitung e.V., 2021)
In diesem Forschungsprojekt wird ein kinematischer Indikator entwickelt, der auf der Basis einer isotropen FE-Simulation den möglichen Fehler aufgrund der Nichtbeachtung der kinematischen Verfestigung während des Umformprozesses ermittelt. Dieser Indikator kann in frühen Machbarkeitsstudien eingesetzt werden, ohne dass die notwendige Werkstoffcharakterisierung im Vorfeld durchgeführt werden muss. Auf diese Weise können das Produkteinführungsrisiko und die Entwicklungskosten minimiert werden. Im vorliegenden Projekt wird der Einfluss nichtlinearer Dehnpfade mit Hilfe von Tiefzieh- und Streifenzugbiegeversuchen untersucht. Anschließend werden die komplexen nichtlinearen Dehnpfade mit Hilfe eines an der Professur Formgebende Fertigungsverfahren, TU Dresden, entwickelten Indikators analysiert, wobei die experimentellen Ergebnisse mit dem Indikator verglichen werden, der den Einfluss des Modells der kombinierten Verfestigung im Gegensatz zum rein isotropen oder kinematischen Materialmodell vorhersagt. Um das angestrebte Ziel zu erreichen, ist das laufende Projekt in drei Teile gegliedert. Zunächst werden Experimente für zwei verschiedene Tiefziehverfahren und das Streifenzugbiegeverfahren durchgeführt. Diese Prozesse werden dann in LS-DYNA mit verschiedenen Verfestigungsgesetzen simuliert, die ein vollständig isotropes, ein kombiniertes und ein vollständig kinematisches Materialmodell umfassen. Die in den Experimenten gemessenen geometrischen Eigenschaften werden dann mit verschiedenen simulierten Verfestigungsmodellen verglichen. Anschließend wird der Einfluss der kinematischen Verfestigung mit Hilfe eines analytischen Indikators analysiert, der die Bereiche zeigt, die am stärksten von der kinematischen Verfestigung beeinflusst werden und der auch den Unterschied der Zielwerte als Ergebnis des isotropen und kombinierten Verfestigungsgesetzes anzeigt. Die in diesem Projekt durchgeführten Arbeiten und Ergebnisse umfassen: Extrahieren der geometrischen Parameter, die Biegewinkel für U-Profil-Proben, Biegeradius für streifenzugbiegeumgeformte Proben und Blechdicke für Kreuznapf-Proben umfassen, zum Vergleich mit drei verschiedenen Verfestigungsgesetzen; Untersuchung des Einflusses der kinematischen Verfestigung als Folge eines nichtlinearen Dehnungsweges mit Hilfe eines analytischen Indikators. Die FE-Simulationen zeigen, dass die aus dem Modell des kombinierten Verfestigungsmaterials extrahierten Ergebnisse den experimentellen Ergebnissen für Tiefzieh-, Streifenzugbiege- und Kreuznapf-Proben weitaus näherkommen. Darüber hinaus ist es mit den Indikatorberechnungen gelungen, die Bereiche vorherzusa-gen, die anfällig für eine Beeinflussung durch die kinematische Verfestigung sind. Solche Regionen werden durch höhere bzw. niedrigere Werte des kinematischen Indikators repräsentier

Representing Process Knowledge Using a Hybrid Fuzzy Rule Approach - Geiger, Manfred; Menzel, Thomas; Novotny, Stefan (Production Engineering. Annals of the German Academic Society for Production Engineering, 2000)
LFT Import::2019-08-05 (771)

Requirements towards future laser systems for flexible manufacturing - Eßer, Gerd; Otto, Andreas; Geiger, Manfred (LANE 2004, Proceedings of the 4th International Conference on Laser Assisted Net Shape Engineering, 2004)
LFT Import::2019-08-05 (1106)

Research activities in field of materials forming behaviour and failure mechanisms - Merklein, Marion; Kuppert, Andreas; Biasutti, Manfredi; Lupino, Roberto (testXpo - 18. International Forum for Materials Testing (19.10.2009), 2009)
LFT Import::2019-08-05 (200)

Researching of commonalities and differences in cold forging of spur and helical gears - Kiener, Christoph; Merklein, Marion (Production Engineering, 2019)
Modern automobiles are equipped with a large number of gear transmissions. In the powertrain, for example, they are used as multi-stage manual transmissions and in the interior for mirror and seat adjustment. Machining manufacturing processes—like gear hobbing and shaping—represent the state of the art in gear manufacturing due to high manufacturing accuracy and flexible machining possibilities. With regard to economic, ecological and technical aspects, cold forging offers a promising production technology. In conventional transverse and forward extrusion processes, the ejection process is a challenge due to high forces and a negative influence on the gearing accuracy. One variant of forward extrusion is the so-called “Samanta” process, whereby an additional ejection step is avoidable by sequential forming of the gears. For the establishment of this process in industry, the increase of the achievable gearing accuracy and the achievable tool life is of major relevance. Thus, a deeper process understanding as well as knowledge about the influences on the process results is beneficial. In this context, the aim of this research work is to produce spur and helical gears by the “Samanta”-process. In addition to the resulting component properties, the characteristics of the process are determined. On this basis, commonalities and differences in cold forging of spur and helical gears are investigated to gain a principle process understanding. These findings are also used to derive possible approaches for improving component and process properties in future research work. The results reveal that cold forging of spur and helical gears by the “Samanta”-process results in characteristic properties and specific challenges within the gear types. Furthermore, a geometric adaptation in the gearing area of the used die promises enormous potential for a positive influence on the process results for both types of gearing.
CRIS-Team Scopus Importer:2019-05-24
Keywords: Cold forging; Gears; Tool

Research of Adapted Tool Design in Cold Forging of Gears - Kiener, Christoph; Merklein, Marion (International Journal of Material Forming, 2019)
LFT Import::2019-07-29 (2383)

Residual effects of ultrasonic assistance in metal forming - Jäckisch, Manuel; Merklein, Marion (1st International Conference on Engineering Manufacture 2022 (EM 2022), 2022)
Characterized by a high material utilization and short cycle times, cold forming processes enable a high efficient and an environmentally compatible production. Nevertheless, an increasing use of high strength materials and a growing demand for complex part geometries pose new challenges to well established forming operations. Thus, there is a demand for innovative processes and process adaptions that extend existing process ranges. A promising measure is the application of ultrasonic assistance. Superimposing a high frequency oscillation to the forming process leads to an immediate material softening, enabling a significant reduction of the process forces. Even though this softening effect is well known and has been addressed in several investigations, the underlying mechanisms remain subject of current research. Besides this temporary softening, there are also residual effects, indicating a permanently altered material state after ultrasonic assistance. Present studies indicate both, residual hardening and softening in the context of ultrasonic-assisted forming. The goal of this contribution is an in-depth analysis of the influence of ultrasonic assistance in metal forming with regard to residual effects. This contributes to clarifying the underlying mechanisms. Therefore, stepwise ultrasonic-assisted compression tests with varying amplitudes and oscillation interval durations are carried out. Focusing on the strain hardening, particular interest is given to variances of the strain hardening exponent as well as the resulting hardness after forming. By comparing the results to conventional compression tests, ultrasonic-induced effects are determined. Moreover, by means of the stepwise conducted experiments the influence on the microstructure is determined for different strain conditions.<br
Keywords: ultrasonic; metal forming; copper; brass

Residual effects of ultrasonic-assisted compression testing on pure copper - Jäckisch, Manuel; Michalski, Markus; Merklein, Marion (AIP Conference Proceedings, 2019)
Due to the rising demand for weight and volume reduction, the usage of high strength materials becomes more and more common. Regarding process forces, the application range of existing presses is limited in forming such metals. One approach to reduce the process forces considerably is superimposing the tool movement with ultrasonic vibration. Although the immediate occurring force and mean stress reduction were first discovered in 1955 by Langenecker and Blaha and are known phenomena, underlying effects of ultrasonic-based material softening remain object of current research. Prominent theories explaining the acoustic softening are stress superposition as well as surface and volume effects. By carrying out ultrasonic-assisted compression tests with 20 kHz oscillation frequency on pure copper, this study intends to determine permanently altered material characteristics. Therefore, compression testing with varying oscillation interval as well as amplitude is conducted and force-displacement-curves are analyzed. In comparison to conventional upsetting, an initial softening effect occurs after the unique presence of ultrasonic-assistance. Moreover, metallographic analyses support former findings. With regard to the examination of material flow as well as grain deformation, permanent microstructure alteration is found. In this way, temporary process-related and permanent material-induced effects are separated.
CRIS-Team Scopus Importer:2019-07-23

Residual Stresses and Distortion due to Laser Beam Welding - Geiger, Manfred; Deinzer, Günter (LSEN, F.O.; Proc. 4th NOLAMP Conf. on Laser Material Processing, 1993)
LFT Import::2019-08-05 (391)

Resonant Simulation of Laser Welding Processes - Geiger, Manfred; Geisel, Mark; Otto, Andreas (Production Engineering, 1998)
LFT Import::2019-07-16 (1589)

Review on mechanical joining by plastic deformation - Meschut, Gerson; Merklein, Marion; Brosius, Alexander; Drummer, Dietmar; Fratini, Livan; Füssel, Uwe; Gude, Maik; Homberg, Werner; Martins, Paulo A. F.; Bobbert, Mathias; Lechner, Michael; Kupfer, Robert; et al. (Journal of Advanced Joining Processes, 2022)
Mechanical joining technologies are increasingly used in multi-material lightweight constructions and offer opportunities to create versatile joining processes due to their low heat input, robustness to metallurgical incompatibilities and various process variants. They can be categorised into technologies which require an auxiliary joining element, or do not require an auxiliary joining element. A typical example for a mechanical joining process with auxiliary joining element is self-piercing riveting. A wide range of processes exist which are not requiring an auxiliary joining element. This allows both point-shaped (e.g., by clinching) and line-shaped (e.g., friction stir welding) joints to be produced. In order to achieve versatile processes, challenges exist in particular in the creation of intervention possibilities in the process and the understanding and handling of materials that are difficult to join, such as fibre reinforced plastics (FRP) or high-strength metals. In addition, predictive capability is required, which in particular requires accurate process simulation. Finally, the processes must be measured non-destructively in order to generate control variables in the process or to investigate the cause-effect relationship. This paper covers the state of the art in scientific research concerning mechanical joining and discusses future challenges on the way to versatile mechanical joining processe
Keywords: Mechanical Joining; Joining processes; Pin-Joining; Clinching; Self-piercing riveting; Versatility

Richten von Blechformteilen mittels laserinduzierten thermischen Spannungen - Hoffmann, Peter; Kraus, Jürgen; Geiger, Manfred (Laser in der Technik. Vorträge des 11. Internationalen Kongresses (LASER 93), 1993)
LFT Import::2019-08-05 (424)

Robot-assisted surface treatment strategies of AA6014 sheet metal for accumulative roll bonding - Zettl, Bastian; Merklein, Marion (ESAFORM 2021 - 24th International Conference on Material Forming, 2021)
The application of high strength aluminum sheet metal components in automotive and aviation products effectively saves material and thus weight. Material strengthening can be realized by accumulative roll bonding (ARB), which belongs to the severe plastic deformation processes. Through repeated rolling steps a multilayered sheet metal is produced, which possesses increased strength due to its ultra-fine grained microstructure. Prior to each rolling step a surface treatment via wire brushing is mandatory for removing the oxide layer and roughening the sheet surface, which enables the bonding between the unique layers during rolling. The necessary surface treatment of the sheets is not fully understood by the current state of the art. In the past, it was not possible to achieve a defined and stable surface finish, because the brushing operation was done manually. The improvement of the process stability is essential to determine the relationship between the input parameters for brushing and the resulting bond strength of multilayered ARB sheets. For this reason, a robot-controlled surface treatment is introduced. The investigated material is the precipitation-hardened aluminum AA6014 with a sheet thickness of 1 mm. A suitable brushing kinematic under constant load is implemented and its effects on the surface properties are investigated by roughness measurements. The investigation shows, that the parameter combination leads to comparable or even higher roughness values than through manual brushing. Through 16 consecutive brushing paths a homogeneous and sufficient high surface roughness is realized, which enables material bonding in the rolling step. Thus, the research results indicate, that the robot-assisted surface treatment of ARB sheet metal is a promising method for a better automation and reproducibility of the brushing and the overall ARB process.
CRIS-Team Scopus Importer:2021-11-26
Keywords: Accumulative roll bonding; Robot-assisted brushing; Roughness; Surface treatment

Robuste, verkürzte Prozessketten für flächige Leichtbauteile - Herausforderung für Forschung und Entwicklung - Kerausch, Michael; Geiger, Manfred (Robuste, verkürzte Prozessketten für flächige Leichtbauteile. Tagungsband zum Industriekolloquium 2003 des SFB 396, 2003)
LFT Import::2019-08-05 (998)

Robustness Analysis of Pin Joining - Römisch, David; Zirngibl, Christoph; Schleich, Benjamin; Wartzack, Sandro; Merklein, Marion (Journal of Manufacturing and Materials Processing, 2022)
The trend towards lightweight design, driven by increasingly stringent emission targets, poses challenges to conventional joining processes due to the different mechanical properties of the joining partners used to manufacture multi-material systems. For this reason, new versatile joining processes are in demand for joining dissimilar materials. In this regard, pin joining with cold extruded pin structures is a relatively new, two-stage joining process for joining materials such as high-strength steel and aluminium as well as steel and fibre-reinforced plastic to multi-material systems, without the need for auxiliary elements. Due to the novelty of the process, there are currently only a few studies on the robustness of this joining process available. Thus, limited statements on the stability of the joining process considering uncertain process conditions, such as varying material properties or friction values, can be provided. Motivated by this, the presented work investigates the influence of different uncertain process parameters on the pin extrusion as well as on the joining process itself, carrying out a systematic robustness analysis. Therefore, the methodical approach covers the complete process chain of pin joining, including the load-bearing capacity of the joint by means of numerical simulation and data-driven methods. Thereby, a deeper understanding of the pin joining process is generated and the versatility of the novel joining process is increased. Additionally, the provision of manufacturing recommendations for the forming of pin joints leads to a significant decrease in the failure probability caused by ploughing or buckling effects.
CRIS-Team Scopus Importer:2022-11-04
Keywords: joining by forming; pin joining; robustness analysis; versatile joining process

Robust, shortened process sequences for sheet light weight parts - Geiger, Manfred; Merklein, Marion; Kerausch, Michael; Celeghini, Martino (Proceedings of the 5th International Conference on Industrial Tools, 2005, Velenje, Slowenien, 2005)
LFT Import::2019-08-05 (1177)

Scale-up of Innovative Forming Solutions from Scientific Fundamentals to Industrial Applications - Merklein, Marion; Lechner, Michael; Böhm, W.; Degner, Julia (2016)
LFT Import::2019-08-05 (2219)

Scaling effects in sheet metal forming. - Kals, Roland; Vollertsen, Frank; Geiger, Manfred (Proc. of the 4th Int. Conf. on Sheet Metal, 1996)
LFT Import::2019-08-05 (661)

Scannerspiegel trifft Adaptive Optik - Neue Systemtechnik zur schnellen 3D-Strahlablenkung - Urmoneit, U.; Dirscherl, Manfred; Guggenmos, M. (Laser in der Elektronikproduktion & Feinwerktechnik - Tagungsband des 9. Erlanger Seminars LEF 2006, 2006)
LFT Import::2019-08-05 (1272)

Schädigungs- und Versagensverhalten hochfester Leichtbauwerkstoffe unter Biegebeanspruchung - Tsoupis, Ioannis (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2017)
A general methodology for the simulation-based determination of damage and failure under bending load for materials with high lightweight potential was developed within this work. In this context, a fundamental understanding about the damage and failure mechanisms during bending sharp radii was simultaneously created both in experimental and simulation-based studies. The developed methodology and the acquired knowledge make a device contribution to design bending dominated forming operations economically, accurately and reliably in practice as well as to predict and prevent the probability of damage and failure prior to manufacture and production in the futur

Scherschneiden und Biegen metallischer Kleinstteile - Materialeinfluss und Materialverhalten - Eckstein, Ralf (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2003)
Sheet metal working processes are also applied for the production of metallic parts with dimensions smaller than 1 mm. The specific characteristics of such processes are investigated carrying out punching and bending experiments. The influence of the anisotropy of the workpiece material and the tool geometry on springback, material flow and sheared edge is presented. The results make an improved process design and a higher accuracy of the workpieces possibl

Schlüsseltechnologie Laser: Innovationen für den Fahrzeugleichtbau - Geiger, Manfred; Hoffmann, Peter; Schultz, Markus (ECLAT 1996, Laser treatment of materials, 1996)
LFT Import::2019-07-15 (647)

Schneiden und Schweißen von Karosserieteilen mit CO2-Hochleistungslasern - Hoffmann, Peter; Geiger, Manfred (Industrieanzeiger, 1990)
LFT Import::2019-07-15 (735)

Schweißen von Kunststoffen mittels Laserstrahlung - Frick, Thomas; Komlodi, Attila (Tagungsband des SYSWELD Forums 2005, 2005)
LFT Import::2019-08-05 (1203)

Section bending between a rigid roller and an elastic pad. - Arnet, Horst; Geiger, Manfred; Vollertsen, Frank (Sheet Metal 1997, Univ. of Ulster, Nordirland, 08.04.-10.04.1997, 1997)
LFT Import::2019-08-05 (686)

Selective application of different forming temperatures for individual process stages in a rivet manufacturing process with high nitrogen steel - Kuball, Clara-Maria; Uhe, Benedikt; Meschut, Gerson; Merklein, Marion (2nd International Conference on Advanced Joining Processes, 2021)

Selective Laser Curing: a new approach towards ceramic prototypes - Otto, Andreas; Niebling, Frank (LIM 2003, Proceedings of the 2nd International WLT-Conference on Lasers in Manufacturing, 2003)
LFT Import::2019-08-05 (942)

Selective Laser Curing of Preceramic Polymers - Sindelar, R.; Niebling, Frank; Buhler, P.; Greil, Peter; Geiger, Manfred (Laser Assisted Net shape Engineering, 2001)
LFT Import::2019-07-15 (874)

Selective Soldering of SMDs with Laser Diodes by the Use of Geometry Adapted Intensity Distributions. - Fröhlich, Thomas; Hierl, Stefan (Proc. of Laser Assisted Net Shape Engineering LANE 97, 1997)
LFT Import::2019-08-05 (711)

Selektives Laserstrahllöten in der industriellen Praxis - Fröhlich, Thomas (Laser, 2000)
LFT Import::2019-07-15 (761)

Self-piercing riveting using rivets made of stainless steel with high strain hardening - Uhe, Benedikt; Kuball, Clara-Maria; Merklein, Marion; Meschut, Gerson (Forming the Future - Proceedings of the 13th International Conference on the Technology of Plasticity. The Minerals, Metals & Materials Series., 2021)

Sensitivitätsanalyse des 3-Rollen-Schubbiegens auf Basis der Finite Elemente Methode - Vatter, Peter (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2015)
The three-roll-push-bending process is a kinematic bending process, which can be used to manufacture almost arbitrarily curved 3-dimensional tube components. A disadvantage compared to conventional tool-bound bending processes is the lower repeat accuracy. This book informs operators as well as machine designers about the causes of process deviations. Additionally, the cause-effect relationship between the input parameters and the geometry parameters is described. By this, measures can be deduced to enhance the process robustness in industrial applicatio

Sensorgesteuerte Laserverfahren in der medizinischen Therapie - Tangermann-Gerk, K.; Eßer, Gerd (Berichte aus der Medizintechnik - 3. Symposium: Neue Technologien für die Medizin - Forschung - Praxis - Innovation, 2001)
LFT Import::2019-07-15 (906)

Sensoriken zur Schwerpunktslagebestimmung der optischen Prozessemissionen beim Laserstrahltiefschweißen - Dietrich, Simon (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2019)
Über die Lage der Prozessemissionen kann beim Laserstrahltiefschweißen auf den aktuellen Zustand des Prozesses und die Qualität der entstehenden Schweißnaht zurückgeschlossen werden. In dieser Arbeit werden die Grundlagen für die Auslegung und Konzeption solcher Onlinesensoren dargestellt. Je nach verwendeter Laserstrahlquelle und Optik ergeben sich unterschiedliche Anforderungen an die Sensoreigenschaften. Für die unterschiedlichen Bedingungen werden verschiedene Messprinzipien dargestellt und erläuter

Seriennahe Auslegung der Prozesskette zur wärmeunterstützten Umformung von Aluminiumblechwerkstoffen - Sulzberger, Andreas (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2013)
The book gives an overview of the potential of the heat supported deformation of aluminum sheet metal materials. By means of the method it is possible to improve the form-changing capabilities of aluminum. The component is pre-formed in a first forming step, locally heat-treated and then drawn to its final geometry. The reader is given insight into the process significantly affecting aspects such as the designing and application of surface inductors and the characterization of temperature-resistant lubricants. In addition, a procedure is defined, with which it is possible to determine the heat treated area

Seriennahe Auslegung von Aluminium Tailored Heat Treated Blanks - Vogt, Uwe (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2009)
By the means of Tailored Heat Treated Blanks (THTB) the forming limits of aluminum alloys can be enhanced significantly, which in turn allows more cost efficient manufacturing processes. The dissertation covers the local heat flow - material interactions, which occur creating the THTB, as well as the pertaining process windows and design principle

Shear-Clinching of Multi-Element Specimens of Aluminium Alloy and Ultra-High-Strength Steel - Han, Daxin; Hörhold, Réjane; Müller, Martin; Wiesenmayer, Sebastian; Merklein, Marion; Meschut, Gerson (Key Engineering Materials, 2018)
The newly developed joining-by-forming technology "shear-clinching", features a potentially single-stage process for joining UHSS without requiring any additional elements. Foundational studies have focused on the functionality of shear-clinching at a one-element sample. To ensure the safety of the industrial application of the shear-clinching technology, an investigation with component-like samples with several joints is required. This paper presents a detailed analysis of the material behaviour during the shear-clinching process with multi-element specimens to evaluate the influence of the neighbouring joints. In order to describe the influence of the neighbouring joints, the deformations resulting from the bending and material displacement are recorded without contact after the joining process: locally around the joining point and globally over the entire sample size. To minimize such bending effects, a tool-sided adaptation is provided. The results show the high potential of shear-clinching joining by UHSS and give further recommendations for future multi-material application.
LFT Import::2019-07-29 (2302)
Keywords: Clinching; Joining by forming; Lightweight; Multi-element specimen; Multi-material mix

Shear-clinching of the high-strength aluminum alloy AA7075 with laser-assisted retrogression - Wiesenmayer, Sebastian; Merklein, Marion (Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 2022)
Due to their extraordinarily high specific strength, aluminum alloys of the 7000 series are coming into focus of car manufacturers. In an aged state, the limited formability of the alloys poses a challenge for joining by forming processes, which are of particular importance for the realization of multi-material lightweight structures. The innovative shear-clinching technology has proven to be suitable for joining die-sided high-strength steels and punch-sided aluminum alloys. Yet, the process is limited by the formability of the upper joining partner. Due to the high strength of AA7075 in the artificially aged T6 temper, the material flow is obstructed during the joining sequence and failure occurs. The formability of the hardenable alloy can be enhanced by the performance of short-term heat treatment prior to joining. For this purpose, a laser is a suitable heat source, allowing the effective heating of small areas. Within this study, the influence of the temperature during the heat treatment with a diode laser on the material properties of AA7075 is investigated by uniaxial tensile tests and metallographic analyses. Moreover, the joinability of the alloy as well as the resulting joint formation and strength in dependence on the process control during the heat treatment are analyzed. Softening of the alloy enhances with increasing heat treatment temperatures. However, in comparison to the T6 temper, the ductility does not increase. For temperatures of 300 degrees C and higher, the joinability of AA7075 after the heat treatment is given. Still, for 300 degrees C cracks are initiated, compromising the joint quality. Despite the occurrence of cracks, the highest joint strength is achieved after a heat treatment at 300 degrees C, as for higher temperatures, the material's strength becomes distinctly lower.
CRIS-Team WoS Importer:2022-12-23

Sheet-bulk Metal Forming a New Process for the Production of Sheet Metal Parts with Functional Components - Schaper, M.; Lizunkova, Y.; Vucetic, M.; Cahyono, T.; Hetzner, Harald; Opel, Simon; Schneider, J.; Koch, T.; Plugge, B. (Metallurgical and Mining Industry, 2011)
The first results of different new sheet-bulk forming methods are presented in the article. It is shown how an additional superimposing of oscillation can be attached to the forming punch in order to improve the forming limit of the sheet material. New coating and atmospheric plasma-nitriding methods for processing of the forming tools (for improving of hardness and wear resistance) are also represented in the article. © Metallurgical and Mining Industry, 2011.
UnivIS-Import:2015-03-09:Pub.2011.tech.FT.FT-KLMEFK.sheetb
Keywords: Atmospheric plasma-nitriding; Pvd/pacvd coatings; Reduce the forming forces; Sheet-bulk metal forming

Sheet-Bulk Metal Forming - Gröbel, Daniel; Schneider, Thomas; Merklein, Marion (60 Excellent Inventions in Metal Forming, 2015)
Sheet-Bulk Metal Forming (SBMF) is an innovative class of forming processes which enables the manufacturing of functional components out of sheet metal. This is achieved by the application of sheet and bulk forming operations on sheets of 1 to 5 mm initial thickness with an intended three dimensional material flow. SBMF products are characterized by profound functional integration and subsequently possess a high lightweight potential. In contrast to alternative production technologies, SBMF formed products feature the advantage of improved mechanical properties due to strain hardening and an unbroken fiber course. Furthermore the possibility to produce high accuracy netshaped parts in mass production with a shortened process chain qualifies SBMF as adequate method to meet present and future demands of production.
LFT Import::2019-08-05 (2073)

Sheet-bulk metal forming – forming of functional components from sheet metals - Merklein, Marion; Gröbel, Daniel; Löffler, Maria; Schneider, Thomas; Hildenbrand, Philipp (Proceedings of the 4th International Conference on New Forming Technology, 2015)
LFT Import::2019-08-05 (2116)

Sheet-Bulk Metal Forming of Preformed Sheet Metal Parts - Schneider, Thomas; Merklein, Marion (Key Engineering Materials, 2011)
Due to ecological and economic challenges there is a rising demand on closely-tolerated complex functional components. Regarding short process chains and improved mechanical properties conventional forming processes are often limited. A promising approach to meet these requirements can be seen in the combination of traditional sheet and bulk metal forming processes, to form sheet metals out of the sheet plane with typical bulk forming operations. The challenge of applying conventional bulk forming operations on sheet metal is the interaction between regions of high and low deformation, which is largely unknown in literature. To analyze this topic fundamentally, a process combination of deep drawing and upsetting is developed for manufacturing tooth-like elements at pre-drawn cups. To fully understand material flow out of the sheet plane into the tooth cavity and to identify and qualify process factors depending on the functional elements' geometry and friction, a single upsetting stage forming a simplified model of the blank is virtually analyzed with finite-element simulation. By inhibiting the forming history of the pre-drawn blank, the upsetting process can be investigated without interactions with a previous deep drawing operation. © (2011) Trans Tech Publications.
LFT Import::2019-07-29 (1634)
Keywords: Deep drawing; Finite element simulation; Sheet-bulk metal forming; Upsetting

Sheet-bulk metal forming - potential and challenges of a new class of forming processes - Schneider, Thomas; Merklein, Marion (Proceedings of PLASTICITY ’15: The Twenty First International Symposium on Plasticity and its Current Applications, 2015)
LFT Import::2019-08-05 (2052)

Sheet-Bulk Metal Forming Processes - State of the Art and its Perspectives - Merklein, Marion; Hagenah, Hinnerk; Schneider, Thomas (TTP 2013 - Tools and Technologies for Processing Ultra High Strength Materials, 2013)
LFT Import::2019-08-05 (1907)

Sheet Hydroforming: Analytical Modeling and Experimental Verification of Complex Structures - Geiger, Manfred; Merklein, Marion; Tolazzi, Massimo (Production Engineering - Annals of the WGP, 2005)
LFT Import::2019-08-05 (1233)

Sheet Metal 2009 - Shirvani, Bez; Duflou, Joost R.; Merklein, Marion; Micari, Fabrizio; Griffiths, Benjamin J.; et al. (Trans Tech Publications, 2009)
Volume is indexed by Thomson Reuters CPCI-S (WoS). Collections of peer-reviewed papers are always excellent sources of knowledge and new ideas for researchers working in both universities and industry. The present collection, in particular, provides interdisciplinary and international resources; thus encouraging the close cooperation of materials scientists, and manufacturing and computer engineers and promoting the diffusion of research results, and technology transfer, in all areas of Sheet Metal Processing and Characterizatio

Sheet Metal 2011 - Duflou, Joost R.; Merklein, Marion; Micari, Fabrizio; Shirvani, Bez; et al. (Trans Tech Publications, 2011)
This work contains the proceedings of the 14th International Conference on Sheet Metal, held in Leuven, Belgium, from the 18th to the 20th April, 2011. Volume is indexed by Thomson Reuters CPCI-S (WoS). The objective of the International Conferences on Sheet Metal is to provide a forum where researchers, academics and industrialists can discuss and promote both the early dissemination of research results, and technology-transfer in sheet-metal processing. The conference provides an opportunity for those working on experimental research, as well as those involved in analytical and numerical modeling, to present their work. The contents therefore provide an unequalled overview of the fiel

Sheet Metal 2013 - Leacock, Alan G.; Duflou, Joost R.; Merklein, Marion; Micari, Fabrizio; et al. (Trans Tech Publication, 2013)
The collection provides an outlet for both industry and academia alike to present their latest findings in the area of sheet metal forming. Volume is indexed by Thomson Reuters CPCI-S (WoS). There are 69 peer reviewed contributions from Industry and academia representing 23 Countries. The research presented covers a diverse field from the fundamental testing and characterisation of sheet metals to the development of new and innovative forming processe

Sheet Metal 2015 - Merklein, Marion; Duflou, Joost R.; Leacock, Alan G.; Micari, Fabrizio; Hagenah, Hinnerk (FAU University Press, 2015)
Collection of selected, peer reviewed papers from the 16th International Conference on Sheet Metal (SheMet 2015), March 16-18, Erlangen-Nürnberg, Germany. The 70 papers are grouped as follows: Chapter 1: Keynote; Chapter 2: Forming; Chapter 3: Bending; Chapter 4: Incremental Forming; Chapter 5: Hot Stamping; Chapter 6: Sheet-Bulk Metal Forming; Chapter 7: Materials Testing; Chapter 8: Modelling; Chapter 9: Cutting and Joining; Chapter 10: Planning; Chapter 11: MatProFutu
Keywords: Forming of Sheet Metal; Hot Stamping; Incremental Forming; Materials Testing; Modelling; Sheet Metal; Sheet-Bulk Metal Forming

Sheet Metal 2021 - Merklein, Marion; Duflou, Joost; Fratini, Livan; Hagenah, Hinnerk; Martins, Paulo A.F.; Meschut, Gerson; Micari, Fabrizio (Trans Tech Publications, 2021)
This volume holds selected papers of the 19th International Conference on Sheet Metal 2021, which provided an excellent platform for the exchange of knowledge for scientists and industry representatives from all over the world. The conference addressed current research and future trends concerning topics related to sheet metals. Besides innovative mechanical joining technologies and the latest developments concerning bonding and welding, the wide-ranging field of sheet metal forming was one of the major issues of the conference. Moreover, SheMet 2021 dealt with research activities regarding incremental forming. As manufacturing technologies are closely associated with the materials to be processed, characterization also represented a key topi
Keywords: Alloy; Bending; Bonding; Forming; Friction; Hardness; Incremental Forming; Joining; Mechanical Properties; Rolling; Sheet Metal; Simulation; Steel; Stress; Surface; Welding

Sheet Metal 2023 - Merklein, Marion; Hagenah, Hinnerk; Duflou, Joost; Fratini, Livan; Evangelista Martins Prado, Gustavo Marcondes; Meschut, Gerson; Micari, Fabrizio (Material Research Forum, 2023)
The book presents recent advances in the following areas: High speed cutting and forming of sheet metals, Incremental forming, Joining by forming, Material characterization, Modelling, Presses and press tools, Processes, Quality and reliability, Sustainabili

Sheet Metal 2025 - Meschut, Gerson; Bobbert, Mathias; Duflou, J. R.; Fratini, Livan; Hagenah, Hinnerk; Martins, Paulo A.F.; Merklein, Marion; Micari, Fabrizio (Materials research Forum LLC, 2025)
The 21st edition of the SheMet Conference again summarizes ongoing research in the field of sheet metal processing. It is also bridging the gab to industrial application by contributions more oriented to realization. The focus is in the field of forming, simulation, incremental forming, machine learning, characterization, welding and additive manufacturing, polymers and composites, sustainability and joining. The book is holding the papers presenting the key findings and aspects of the given presentations.<br

Sheet metal forming - a new kind of forge for the future - Geiger, Manfred; Merklein, Marion (Key Engineering Materials, 2007)
Within the last years in sheet metal forming a trend towards forming at elevated temperatures as well as temperature assisted forming technologies can be observed. This development is caused by the increasing need on light and high strength materials in order to fulfill the demands of light weight structures. The decision which kind of temperature assistance is the most useful in order to improve the formability of the material depends on a hugh number of process influencing parameters, like e.g. the material itself, the geometry of the component, the number of forming operations etc.. In this paper the general possibility to separate different temperature assisted forming processes with regard to the used materials will be introduced. The different forming procedures will be explained and discussed. Examples with an industrial relevance are shown.
LFT Import::2019-07-16 (1467)
Keywords: Elevated temperature; Hot stamping; Sheet metal forming

Sheet metal forming limits as classification problem - Jaremenko, Christian; Huang, Xiaolin; Affronti, Emanuela; Merklein, Marion; Maier, Andreas (Proceedings of the 15th IAPR International Conference on Machine Vision Applications, 2017)
Forming limit diagrams are used to evaluate the formability of metal sheets and describe the maximum strain to failure in terms of major and minor strain. The main idea is the detection of the onset of necking in limited areas of the investigated sheet metals. Current methods introduce location-or time-dependency or may require user interaction. Within this contribution we interpret the onset of necking as classification problem and show that a support vector machine performs comparable to a human experts group. Best results reach up to 87.5 % avg. precision and 84.9 % avg. recall, using all available 2D-information, while being time- and location-independent.
UnivIS-Import:2017-12-18:Pub.2017.tech.IMMD.IMMD5.sheetm

Sheet Metal Hydroforming of Complex Components with a Ring-Shaped Geometry - Tolazzi, Massimo; Geiger, Manfred (Sheet Metal 2003, Proceedings of the 9th International Conference on Sheet Metal, 2003)
LFT Import::2019-08-05 (949)

Short Term Effects of Laser Forming in Aluminium Alloys - Geiger, Manfred; Merklein, Marion (Production Engineering, 2000)
LFT Import::2019-07-15 (772)

Simulacao ajuda a determinar pârametros na hidroconformacao de chapas métalicas - Kohlbauer, Rainer (Máquinas e Metais, 2003)
LFT Import::2019-07-16 (1019)

Simulation-Based Determination of Deflection Characteristic of Tooling System and its Modeling in FE Simulation of Cold Forging Process - Kroiß, Thomas; Engel, Ulf; Merklein, Marion (Steel Research International, 2010)
LFT Import::2019-08-05 (722)

Simulation based Evaluation of the Accuracy for Sheet Metal Bending caused by the Bending Stage Plan - Hagenah, Hinnerk (Proceedings of the 36th CIRP Seminar on Manufacturing Systems, Progress in Virtual Manufacturing Systems, 2003)
LFT Import::2019-08-05 (929)

Simulation-Based Investigation of the Heat Exchange Within a Partial Hot Stamping Process - Reihani, Alborz; Badroosian, Darwin; Heibel, Sebastian; Schweiker, Thomas; Merklein, Marion (Lecture Notes in Mechanical Engineering, 2024)
Studies on crash performance show that hot stamped components with homogeneous mechanical properties can reach their limits in highly stressed car body areas. To face this challenge, hot stamped components can be optimized by integrating ductile areas. A suitable technology for adjusting tailored properties is based on a special furnace chamber within a multi-chamber furnace in which a cooled aluminum mask protects the blank locally from incident heat radiation. Simultaneously, the mask absorbs the blank’s own radiation. In addition to the temperature and radiation properties, this heat exchange depends in particular on the orientation and position of the radiating surfaces in the furnace chamber. For this reason, the mask distance to the blank can influence the width and characteristics of the transition zone after partial hot stamping. In order to predict the correlation between hard and ductile area, the process of partial hot stamping with varying mask distances is modelled in LS-DYNA® and validated experimentally. The results indicate that it is feasible to simulate the influence of the mask distance on the resulting hard, soft and transition zone after partial hot stamping. Furthermore, the results demonstrate that transition zones on a partially hot stamping part can be designed more flexibly, thus extending the limits in terms of part complexity.
CRIS-Team Scopus Importer:2023-10-20
Keywords: Finite-Element Simulation; Heat Treatment; Hot Stamping; Tailored Properties

Simulation based optimisation of the accuracy of sheet metal bending parts caused by the manufacturing plan - Geiger, Manfred; Hagenah, Hinnerk; Menzel, Thomas (Proceedings of the 2nd CIRP International Seminar of Intelligent Computation in Manufacturing Engineering ICME 2000, 2000)
LFT Import::2019-08-05 (764)

Simulation der Versagensformen Verschleiß und Bruch. - Engel, Ulf; Hänsel, Matthias; Sobis, Tomasz; Geiger, Manfred (Werkstatt und Betrieb, 1992)
LFT Import::2019-07-16 (1963)

Simulation der Werkzeuglebensdauer bei Ermüdungsversagen - Killmann, Martin; Merklein, Marion (36. Jahrestreffen der Kaltmassivumformer 2023, 2023)
Wie funktioniert eine Lebensdauerberechnung? Welche Materialparameter werden dafür benötigt? Wie können Materialparameter experimentell ermittelt werden? Wie kann eine Lebensdauersimulation in der Praxis eingesetzt werden?<br

Simulation in Microforming - Engel, Ulf; Geißdörfer, Stefan (Proceedings of the 5th International Conference on Industrial Tools, 2005)
LFT Import::2019-08-05 (1140)

Simulation of a Full Forward Extrusion Process from Metal Strip - Merklein, Marion; Stellin, Tommaso; Engel, Ulf (AIP Conference Proceedings, 2011)
The interest on mass production of small complex metal components is currently fostered by fields like electronics and micromechanics. A possible approach is seen in a multi-step bulk forming process, limited among scaling problems by handling difficulties between the forming stages. A radical simplification of the positioning of the workpiece is seen in a process in which a metal strip acts both as raw material and support of the workpiece through the different forming stages. Within the study of this method, a full forward extrusion process from metal strip has been simulated with the goal of getting the basic knowledge about the strip behavior and process performance. The influence of the main geometric and tribological features has been evaluated designing a full factorial plan. The role of the radius of curvature of the tool edges and of the factor of friction have become the points of main interest in the optimization of the process. © 2011 American Institute of Physics.
LFT Import::2019-07-29 (1636)
Keywords: full forward extrusion; metal strip forming; microforming

Simulation of laser beam forming of large work pieces - Komlodi, Attila; Otto, Andreas (LIM 2005, Proceedings of the 3rd International WLT-Conference on Lasers in Manufacturing, 2005)
LFT Import::2019-08-05 (1187)

Simulation of Light Propagation within Glass Fiber Filled Thermoplastics for Laser Transmission Welding - Hohmann, Martin; Devrient, Martin; Klämpfl, Florian; Roth, Stephan; Schmidt, Michael (2014)

Simulation of Microforming Processes - An Advanced Approach Apllying a Mesoscopic Model - Geißdörfer, Stefan; Engel, Ulf; Geiger, Manfred (Proceedings of the 8th International Conference on Technology of Plasticity (ICTP), 2005)
LFT Import::2019-08-05 (1250)

Simulation of Microforming Processes by Applying a Mesoscopic Model - Geißdörfer, Stefan; Engel, Ulf; Geiger, Manfred (Proceedings of the 4th International Conference on Multi-Material Micro Manufacture, 2008)
LFT Import::2019-08-05 (1532)

Simulation of Warm Forming Processes - Bitter, Stefan; Falk, Bernd; Geiger, Manfred (Proceedings of the AMPT '01 Advances in Materials and Processing Technologies, 2001)
LFT Import::2019-08-05 (856)

Simulationsbasierte Bestimmung der zu erwartenden Maßhaltigkeit für das Blechbiegen - Hagenah, Hinnerk (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2003)
Employing Monte-Carlo simulation the expected accuracy of sheet metal bending is estimated. The simulation results are summarised as capability indices. Unavoidable rework is known prior to manufacture thus increasing planning certainty. Furthermore the so far unused optimisation potential in bending stage planning can be accessed and exploited with the assistance of this syste

Simulationsbasierte Lebensdauervorhersage für Werkzeuge der Kaltmassivumformung - Falk, Bernd (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2000)
The partition of automobile components produced by cold forging shows a significant potential of economic growth. Especially so-called Near-Net-Shape- and Net-Shape-Parts, which feature geometrical properties close to the rated values have a special importance. From an industrial view the necessity exists to predict not only the tool lifetime but also the lifetime scatter during the product development period. In this context the numerical process simulation enables the estimation of tool load and forms the basis for every lifetime calculation. The methods which have been applied until now for lifetime prediction of cold forging tools can be denoted as deterministic methods. In general, they lead only to an insufficient prediction accuracy. Furthermore, the stochastic characteristics of the primary parameters of influence cannot be considered in an efficient manner. Therefore, it was the primary goal of this thesis to develop a sufficient method for the lifetime calculation of cold forging tools. Beside the principle demand, the improvement of the prediction accuracy, a so-called stochastic-deterministic method enables it to the trace back the stochastic lifetime characteristic of the tool system to the scatters of the primary parameters of influenc

Simulationsbasierte Optimierung eines Ultraschallmessverfahrens zur Bewertung der Montagequalität armierter Werkzeuge für die Kaltmassivumformung - Putz, Alexander; Kühnicke, E. (Tagungsband der DACH-Jahrestagung, 2005)
LFT Import::2019-08-05 (1036)

Simulationsbasierte Untersuchung eines neuartigen Fügekonzepts für Rotoren elektrischer Maschinen - Frey, Philipp; Hildering, Sven; Tsoupis, Ioannis; Stellin, Tommaso; Merklein, Marion (Tagungsband 17. RoundTable - Simulating Manufacturing, 2016)
LFT Import::2019-08-05 (2171)

Simulationsgestütze Analyse komplexer Strukturen beim IHU von Blechen - Geiger, Manfred; Vahl, Meik (Tagungsunterlagen zum Seminar Virtual Materials Processing des Kompetenzzentrums Neue Materialien Nordbayern GmbH, 2002)
LFT Import::2019-08-05 (1707)

Simulationsgestütze Bewertung des Einflusses von Technologieinnovationen auf die Produktion - Geiger, Manfred; Menzel, Thomas (Modellierung der Produktion. Abschlusskolloquium zum DFG - Schwerpunktprogramm. Hannover, 7. und 8. März, 2000)
LFT Import::2019-08-05 (770)

Simulationsgestützte Auslegung maßgeschneiderter wärmebehandelter Aluminiumhalbzeuge - Merklein, Marion; Hagenah, Hinnerk; Lechner, Michael; Kuppert, Andreas (16. Workshop Simulation in der Umformtechnik, 2013)
LFT Import::2019-08-05 (1886)

Simulationstechniken: Kostengünstig Optimieren - Arbak, Murat; Wagner, Kay; Ersoy, K. (FORM + Werkzeug, 2007)
LFT Import::2019-07-16 (1465)

Simulative Auslegung der Spann- und Fixierkonzepte im Karosserierohbau: Bewertung der Baugruppenmaßhaltigkeit unter Berücksichtigung schwankender Einflussgrößen - Konrad, Tobias (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2019)
This research work investigated which material and process factors have a significant influence on the dimensional accuracy of assemblies. The main aim of this study was the development of cause-effect relations in order to design the clamping and fastening concepts of assemblies. The result is a method, which is independent of the assembly and with which the influence of framing stations' parameters can be estimated. Recommandations in the form of process windows were generated for the future design process of assemblies, enabling lower shape deviations. An improvement of the dimensional accuracy of principal and real add-on parts were realized by optimizing the statistically distributed input variables of the clamping and fastening processes. This research topic will keep his high importance in the future as adapting the clamping and fixture concept produces less costs than tool change

Simulative Optimization of the Rubber Pad Bending - Nock, Marco (NUMIFORM 2004, Materials Processing and Design. Proceedings of the NUMIFORM, 2004)
LFT Import::2019-08-05 (1048)

Simulative Prognose der Geometrie indirekt pressgehärteter Karosseriebauteile für die industrielle Anwendung - Hippchen, Paul (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2014)
The prediction of the part geometry and its final mechanical properties by means of the finite element method is one of the most important aspects in vehicle development. By means of the thermo-mechanical and metal-physically coupled material model introduced in this work, the mechanisms and boundary conditions of the indirect hot stamping process can be calculated close to reality. Thus the part geometry can be predicted in order to develop and assure geometrical compensation methods. Furthermore the final mechanical properties can be calculated for mapping to the finite elements used in crash simulations to assure the vehicle design in terms of passive safet

Simulative Prognose der Geometrie nassgepresster Karosseriebauteile aus Gelege-Mehrschichtverbunden - Amann, Christoph (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2019)
This thesis focused on the development of a simulation approach for predicting process-induced deformations of wet moulded car body parts. The approach not only captures the well-known deformation modes spring-in and warpage, but also an up to now insufficiently analysed bending deformation. Besides the development of an efficient FE discretisation strategy, the influence of process-related factors like radii correction and fibre reorientations was investigated. To this end, the sub-process simulations for forming and geometry prediction were coupled. The aforementioned simulation method was validated by analysing several CFRP body in white components that show the well-known spring-in deformation as well as a dominant bending deformation. Based on the validated simulation approach, recommendations towards the future design of CFRP parts with high geometrical accuracy could be mad

Simultaneous Laser Soldering of SMDs: A new Approach for MIDs - Hierl, Stefan; Hirt, W. (Proceedings of the 3rd International Congress on Molded Interconnected Devices MID 1998, 1998)
LFT Import::2019-08-05 (1606)

Simultanes Löten von Anschlußkontakten elektronischer Bauelemente mit Diodenlaserstrahlung - Fröhlich, Thomas (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2002)
Laser soldering in electronics production is a selective and contact-free soldering method for leaded components and allows even joining in a thermally sensitive environment. Special beam forming and guiding units combined with several diode lasers are integrated in a laser soldering system which has advantages for an automated soldering system with a high productivit