Guideline for the determination of forming limit curves - Liebertz, H.; Duwel, A.; Illig, R.; Hotz, W.; Keller, S.; Koehler, A.; Staubwasser, L.; Steinbeck, G.; Vegter, H. (Proceedings of IDDRG, 24.-26.05., Sindelfingen, Germany, 2004)
LFT Import::2019-08-05 (1095)

Halogen Beam Assisted Welding of 3D Shaped Polymers in Automotive Applications - Frick, Thomas; Schmidt, Michael; Hofmann, Thomas (LAMP 2006, Proceedings of the 4th International Congerss on Laser Advanced Materials Processing, Mai 2006, Kyotot, Japan, 2006)
LFT Import::2019-08-05 (1380)

Herausforderungen beim Systemdesign optischer Datenübertragungssysteme für hohe Datenraten - Rank, M.; Stark, Markus (LEF 2006, Laser in der Elektronik- & Feinwerkproduktion, 2006)
LFT Import::2019-08-05 (1332)

Herausforderung Materialmix - neue Lösungen durch Lasertechnologie - Berchtold, L.; Mys, I. (Laser in der Elektronikproduktion & Feinwerktechnik LEF 2004, 2004)
LFT Import::2019-07-16 (1072)

Herstellung flächiger Verbundbauteile mit Metallschaumkernen - Körner, Carolin; Heinrich, Frank; Singer, Robert; Otto, A.; Schöberl, T.; Geiger, Manfred (Sonderforschungsbereich 396 - robuste verkürzte Prozessketten für flächige Leichtbauteile - 1. Berichtskolloquium 24./25.Mai, 2000)
LFT Import::2019-08-05 (785)

Herstellung von Serienwerkzeugen mittels Metallfolien-LOM - Seidel, S. (3D-Erfahrungsforum Innovation im Werkzeug- und Formenbau, 2007)
LFT Import::2019-07-16 (1455)

High-power laser welding of contaminated steel sheets - Geiger, Manfred; Kägeler, Christian; Schmidt, Michael (Production Engineering, 2008)
A deep penetration laser welding process differs from a heat conduction laser welding process in the generation of a steam capillary through the material. The so called keyhole is formed if high energy densities of the laser beam vaporize the base material, leading to a vapor-filled channel which is surrounded by a liquid weld pool. The shape and the oscillations of the keyhole are affected by various physical parameters of the welding process. Under constant process conditions a balance of pressure keeps the capillary open. If the material is contaminated by a layer with physical properties differing from the bulk material (e.g. oil), the equilibrium is disturbed in a negative way. The coating evaporates during the melting of the base material, resulting in vapor locks at the capillary and the weld pool, leading to pores and failures along the weld seam. In order to understand and avoid this effect, it is the aim to analyze and describe the failure generating mechanisms. Additionally, a control method of the laser power is investigated which influences the keyhole's oscillations and could suppress an unwanted collapse. © German Academic Society for Production Engineering (WGP) 2008.
LFT Import::2019-07-29 (1541)
Keywords: Laser welding; Process oscillations; Production process

How Basic Research Contributes to Eco-friendly Application of Manufacturing Technologies. - Engel, Ulf (Proc. of the 3rd Int. Workshop on Environmental Conscious Manufacturing - Ecology and Economy in Metal Forming and Cutting (ICEM'97), Den Bosch, Netherlands, Sept. 29 - Oct. 1, 1997)
LFT Import::2019-08-05 (705)

Hybrides Laserdurchstrahlschweißen von Kunststoffen - Hofmann, Alexander (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2006)
The present work develops a hybrid Welding method for polymers employing laser Radiation as well as Radiation emitted by halogen lamps. lt is based upon the conventional laser Transmission contour Welding, with its process stability and Efficiency being increased by the hybrid Irradiation System. In the work, a hybrid Welding System will be introduced and the influence of the hybrid Irradiation principle on the seam strength, the gap-bridging ability and the Formation of residual stresses will be investigated. Enhancing the conventional laser Transmission Welding by the hybrid variant, Welding large and complexly shaped products shall become feasible no

Hybridschweißen - Chancen für die Fertigung von 3D-Makroschweißungen - Hofmann, Achim; Frick, Thomas; Schmidt, Michael (Laser in der Elektronikproduktion & Feinwerktechnik - Tagungsband des Erlanger Seminars LEF 2006, 2006)
LFT Import::2019-08-05 (1330)

Hybridschweißen von Kunststoffen - Durch den kombinierten Einsatz von Laserstrahlung und Heizstrahlung beim Schweißprozess eröffnen sich völlig neue Anwendungsfelder - Geiger, Manfred; Brandmayer, O.; Frick, Thomas (Joining Plastics - Fügen von Kunststoffen, 2007)
LFT Import::2019-07-16 (1482)

Hybridschweißen von Kunststoffen - eine neue Technologie zum Fügen von Makrobauteilen - Frick, Thomas; Schmidt, Michael; Hofmann, Thomas (Automobiltechnik in Bayern, 2006)
LFT Import::2019-07-16 (1359)

Improvement of the Reliability of Laser Beam Micro Welding as Interconnection Technique. - Glasmacher, Matthias; Pucher, Hans-Jörg; Geiger, Manfred (Proceedings of the OE/LASER Optoelectronics and Lasers, 1996)
LFT Import::2019-08-05 (659)

Improving the Fatigue Resistance of Cold Forging Tools by FE-Simulation and Computer Aided Die Shape Optimization - Geiger, Manfred; Hänsel, M; Rebhan, T (Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 1992)
It is the intention of the present article to point out a new method for computer aided tool optimization as part of computer integrated tool manufacturing. Based on the results of finite element (FE) analysis and subsequent tool failure simulation, it is possible to optimize the FE model of a tool already at the stage of construction, in order to enhance the service life and process reliability. The permissible degree of freedom for any shape correction, of course, is mainly limited by constructive constraints of the tool and the properties of the material flow during the extrusion process. Thus the resulting optimized geometry has to he considered as a possible constructive alternative. However, analytical as well as practical solutions already show that a parabolical or elliptical curved surface contour, replacing a regular radius, not only improves the fatigue resistance but may have a positive influence on material flow behaviour, friction forces and resulting tool loads as well (1). The influence imposed on the material flow by the geometrical modification of the die shape will be clarified in future by the results of FE process simulation. A renewed simulation run, employing the optimized shape, may be conducted immediately after the optimization process. Along with current material research, the simulation of tool failure based on the finite element method (FEM) analysis of forging techniques (FE process simulation) therefore represents a promising direction for future developments (2-4). © 1992, Institution of Mechanical Engineers. All rights reserved.
LFT Import::2019-07-15 (374)

Individuelle, laserstrahlgesinterte Kunststoffimplantate aus Polyetheretherketon - Schmidt, Michael; Rechtenwald, T.; Pohle, D. (Medizintechnik in Bayern, 2006)
LFT Import::2019-07-16 (1287)

Inferenzmaschine für ein Biegestadienplanungssystem - Geiger, Manfred; Hoffmann, M; Kluge, B (ZWF (1992), Nr. 87/5, 1992)
LFT Import::2019-08-05 (377)

Influence of Various Atmospheres on the Laser Micro Welding Process of Electronic Contacs - Geiger, Manfred; Fleckenstein, Marc (Production Engineering. Annals of the German Academic Society for Production Engineering, 2001)
LFT Import::2019-08-05 (865)

Innovative Lasermaterialbearbeitung mit neuen, hoch brillanten Laserstrahlquellen - Grimm, Alexander; Zimmermann, Maik (Neue Materialien, Verfahren und Produkte in Bayern, 2008)
LFT Import::2019-07-29 (1556)

Innovative Technologien und Prozesse - Teil 2 - Albert, F.; Boiger, M.; Brenner, P.F.; Mys, R. (PLUS, 2004)
LFT Import::2019-07-16 (1070)

In-Prozesserfassung der axialen Fokuslage bei beliebigen Laserprozessen - Hohenstein, Ralph (Tagungsband zum Workshop Inline-Qualitätssicherung beim Laserstrahlfügen, 2006)
LFT Import::2019-08-05 (1289)

Integration of Diagnostics in High Power Laser Systems for Optimization of Laser Material Processing - Biermann, S; Hutfless, J; Geiger, Manfred (SPIE- High Power Lasers. Int. Conf. OE/Laser 91, 1991)
Experimental investigations on high power CO2-laser systems has been carried out. To ensure the processing quality and to allow a fast reaction in case of an accident a diagnostic system was developed and realized with integrating special equipment for on-line and off-line diagnostics for laser beam, gasflow and workpiece temperature.
LFT Import::2019-08-05 (229)

Integrierte Fertigung durch Umformen, Trennen und Fügen in einem Werkzeug - Geiger, Manfred; Kreis, Oliver (Autonome Produktion, 2003)
LFT Import::2019-07-15 (996)

Integrierte Fertigung - Verfahrensintegration durch Innenhochdruck-Umformen, Trennen und Laserstrahlschweißen in einem Werkzeug sowie ihre tele- und multimediale Präsentation. - Kreis, Oliver (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2002)
This thesis presents a methodology for the modeling of processes and process chains and shows exemplarily the development of a shortened process chain for the manufacturing of sheet light weight parts, that integrates the processes preforming by hydroforming, mechanical shear cutting, joining by laser beam welding and hydrocalibrating in one single tool. A scientific-based tele- and multimedia presentation enables a knowledge transfer anywhere at any time with a high clearness, flexibility and learning efficiency. In vorliegender Arbeit wird eine Vorgehensweise zur Modellierung von Prozessen und Prozessketten allgemein dargestellt und exemplarisch eine verkürzte Prozesskette zur Herstellung flächiger Leichtbauteile entwickelt. Die Prozesskette besteht aus den Prozessen Vorformen mittels Innenhochdruck-Umformen (IHU), Trennen durch mechanisches Scherschneiden, Fügen mittels Laserstrahlschweißen und Ausformen/Kalibrieren durch IHU. Eine wissenschaftlich fundierte tele- und multimediale Präsentation ermöglicht ein zeit- und ortsungebundenes E-Learning mit hoher Anschaulichkeit, Flexibilität und Lernwirksamkei
Keywords: Didaktik; Innenhochdruck-Umformen; Laserstrahlschweißen; Multimedia; Prozesskettenverkürzung; Verfahrensintegration

Integriertes Bestück- und Laserstrahl-Lötsystem mit prozessbegleitender Qualitätssicherung - Geiger, Manfred; Albert, F. (Produktionssysteme in der Elektronik, 2005)
LFT Import::2019-07-16 (1224)

Internationale Forschung Umformtechnik - Geiger, R.; Geiger, Manfred (Industrieanzeiger, 1976)
LFT Import::2019-07-15 (336)

Introduction: High Power Lasers and Systems for Manufacturing - Otto, Andreas (LIM 2003, Proceedings of the 2nd International WLT-Conference on Lasers in Manufacturing, 2003)
LFT Import::2019-08-05 (994)

Investigating a laser welding process with methods of non-linear dynamics - Kägeler, C.; Klämpfl, F.; Otto, Andreas; Schmidt, Michael (Proceedings of the 4th International WLT-Conference on Lasers in Manufacturing, 2007)
LFT Import::2019-08-05 (1416)

Investigations on the Sheet Bending Process with Elastic Tools - Geiger, Manfred; Engel, U; Vom Ende, A (Journal of Materials Processing Technology, 1991)
The forming process investigated in this study is the bending of U-shaped parts with a rigid punch and an elastic die. The methods of the finite element approach used for the process simulation are described. One of the most important input data for such an analysis is the material characterization especially the description of the rubber-like behavior of the die. The experimental and theoretical procedures to determine the material constants are presented. The process simulation is performed for three sheet materials and different values of sheet thickness and die hardness. In comparison with some experimental results it is shown that the FEM-approach is suitable to simulate the characteristic features of the whole process such as e.g. the dependence of bend angle on material and thickness of the sheet. Furthermore the observed curvature of the bent part can be understood in terms of the calculated stress distributions on the interfaces between punch and sheet, and sheet and die respectively. The process force resulting from simulation can be taken as an upper bound. Thus, the methods discussed in this study are suited to improve the understanding of the process and to assist the engineer in designing a particular bending operation. © 1991.
LFT Import::2019-07-15 (238)

Kaltmassivumformung metallischer Kleinstteile - Werkstoffverhalten, Wirkflächenreibung, Prozeßauslegung- - Meßner, Arthur (1998)
Microparts with a wide variety of shapes and functions are used in large numbers in the fields of electronic production and micro mechanics. The production of those parts by means of metal forming has several advantages compared to alternative manufacturing methods. The aim of this project was to transfer the process knowledge from conventional metal forming to microforming, thus establishing guidelines for process design. In order to determine size dependent effects on metal forming behavior, basic tests like tension, upsetting and ring upsetting experiments were performed, using scaled specimen, ranging from macro to micro dimensions. Significant size effects could be found, which result mainly from the fact that microstructure and surface topography do not change with part dimensions. Based on these findings models were developed to describe the miniaturization effects on friction and material behavior. Furthermore, these models were implemented into existing FEM software to provide the basis for size dependent numerical simulation. Finally, the experimental findings from the previously performed basic test were verified for a more complex process, the solid forward extrusion. As before, also the extrusion process was performed with scaled specimen and scaled tooling. The smallest of these tools produces a part with a diameter of 0.3 mm, starting from a billet of 0.5 mm diameter and represents the worlds smallest extrusion too

Kaltmassivumformung - VDI-Tagung 1976 - Geiger, Manfred (VDI-Tagung 1976, 1977)
LFT Import::2019-08-05 (337)

Karosseriefügetechnik heute - Herausforderung und Lösungen - Schmidt, Michael (Tagungsband 4. Fachtagung Fortschritte im Automobil-Rohbau, 2006)
LFT Import::2019-08-05 (1354)

Kleinst-Produktionslinie zur Fertigung hochpräziser faseroptischer Mikroteile - Zimmermann, M.; Weber, Manuel; Wolf, W.; Junker, S.; Menschig, A. (LEF 2006, Laser in der Elektronik- & Feinwerkproduktion, 2006)
LFT Import::2019-08-05 (1296)

Kombinationen von Lasermaterialbearbeitung und Blechumformung - Otto, Andreas (LaserOpto, 2001)
LFT Import::2019-07-15 (901)

Kombiniertes Schneiden und Schweißen von Blechteilen im Automobilbau - Geiger, Manfred (2. Int. Anwenderforum Laser-Materialbearbeitung für den Automobilbau, 1990)
LFT Import::2019-08-05 (504)

Kurze Pulse in der Industrie - Trends in Markt und Technologie - Schmidt, Michael; Kägeler, C.; Heider, J. (11. Seminar LEF 2008, Laser in der Elektronikproduktion & Feinwerktechnik, 2008)
LFT Import::2019-08-05 (1522)

Lamellierte Aktiv-Werkzeugelemente in flexiblen Blechumformwerkzeugen - Geiger, Manfred; Euringer, Maximilian (Blech, Rohre, Profile, 1998)
LFT Import::2019-07-16 (1587)

Laser assisted bending and roll forming - Geiger, Manfred (Proceedings og the International Conference LANE 2004, 2004)
LFT Import::2019-08-05 (1065)

Laser based rework in electronics production - Albert, F.; Mys, I.; Schmidt, Michael (Laser-based Micropackaging, Proceedings of SPIE, 2007)
Despite the electronic manufacturing is well-established mass production process for a long time, the problem of reworking, i.a. reject and replace of defect components, still exists. The rework operations (soldering, replacement and desoldering) are performed in most cases manually. However, this practice is characterized by an inconsistent quality of the reworked solder joints and a high degree of physiological stress for the employees. In this paper, we propose a novel full-automated laser based soldering and rework process. Our developed soldering system is a pick-and-place unit with an integrated galvanometer scanner, a fiber coupled diode laser for quasi-simultaneous soldering and a pyrometer-based process control. The developed system provides soldering and reworking processes taking into account a kind of defect, a type of electronic component and quality requirements from the IPC-610 norm. The paper spends a great deal of efforts to analyze quality of laser reworked solder joints. The quality depends mainly on the type and thickness of intermetallic phases between solder, pads and leads; the wetting angles between pad, solder and lead; and finally, the joint microstructure with its mechanical properties. The influence of the rework soldering on these three factors is discussed and compared to conventional laser soldering results. In order to optimize the quality of reworked joints, the different strategies of energy input are applied.
LFT Import::2019-08-05 (1407)
Keywords: Electronics; Quasi-simultaneous soldering; Rework; Soldering

Laser Based Welding and Brazing in Automotive Production - Albert, F.; Grimm, A.; Kägeler, C.; Schmidt, Michael (Proceedings of the 3rd International Conference on Laser Technologies in Welding and Materials Processing LTWMP, 2007)
LFT Import::2019-08-05 (1406)

Laser Beam Cutting of Aluminium Foam Sandwiches - Schöberl, T.; Otto, Andreas (Proceedings of Laser Assisted Net Shape Engineering, 2001)
LFT Import::2019-08-05 (840)

Laser Beam Cutting with Solid State Lasers and Industrial Robots - Geiger, Manfred; Gropp, A (Proc. of the 4th European Conf.on Laser Treatment of Materials (ECLAT) (1992), Göttingen, Oberursel : DGM Informationsgesellschaft, 1992)
LFT Import::2019-08-05 (372)

Laser Beam Joining of Silicon - Kaufmann, S. (Laser Assisted Net Shape Engineering 3, 2001)
LFT Import::2019-08-05 (892)

Laser Beam Soldering of Fine Pitch Technology Packages with Solid Solder Deposits. - Pucher, Hans-Jörg; Glasmacher, Matthias; Geiger, Manfred (Proceedings of the OE/LASER Optoelectronics and Lasers, 1996)
Micro electronics is a key technology attracting the attention of information, communication, automation and data processing technologies. Ongoing miniaturization combined with an increasing number of I/Os has inevitably lead to ever finer lead geometries. Therefore the demands put upon the surface mount technology are increasing continuously. Processing of high lead count fine pitch packages, for example those which are applied in high-capacity computers, has not increased the demands put upon the assembly process only, but also on the connecting techniques. By reflow soldering with laser beam radiation the benefits from the tool 'laser beam' are used extensively, for example contact and force free processing, strictly localized heating and the good controllability thereof, formation of fine crystalline and homogeneous structures, etc. Within the scope of this paper the fundamentals of laser beam soldering are discussed for fine pitch lead frames (pitch 300 micrometers ) for plastic packages, made by a modified CuFe2P alloy with a 5 micrometers Sn90Pb plating, on solid solder depths (Sn63Pb) performed by the so called High-Pad process. These investigations are unique in the field of laser beam soldering and are carried out by means of a Nd:YAG-laser. A pyrometer is used for detection of the emission of the temperature radiation of the joining area for process control. The additional use of a high-speed camera gives a detailed description of the melting and wetting process. The influence of laser beam parameters and the volume of the solid solder deposits on the joining result are presented. ©2005 Copyright SPIE - The International Society for Optical Engineering.
LFT Import::2019-08-05 (668)
Keywords: Electronics production; Fine pitch technology packages; Laser beam soldering; Reflow soldering and wetting process; Solid solder deposits

Laserbearbeitung in der Elektronikproduktion für die Automobilindustrie - Albert, F.; Niemeier, J.; Herenz, A. (Tagungsband LEF 2006, 2006)
LFT Import::2019-08-05 (1278)

Laser Direct-Writing of AlN Substrates - Illyefalvi-Vitez, Z.; Geiger, Manfred (Proc. of the 10th ISHM, 1995)
LFT Import::2019-08-05 (568)

Laserdurchstrahlschweißen transparenter Polymerbauteile - Polster, Steffen (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2009)
Durch das Laserschweißen transparenter Polymerbauteile mittels räumlich definierten Energieeintrags ohne Zusatzmaterialien wird der Weg zum Einsatz des Laserdurchstrahlschweißens in der Mikrosystemtechnik und Medizintechnik geebnet. Dieser schnelle Fügeprozess erlaubt kurze Prozesszeiten und vermeidet die Handhabung von zusätzlichen Verbindungshilfsmitteln, wodurch ein zuverlässiger und wirtschaftlicher Fügeprozess möglich wir

Lasergestützte Fertigungsverfahren - Innovationen für die Mikrotechnik von morgen - Fleckenstein, Marc; Schmidt, Michael; Geiger, Manfred (Proceedings of the 5th International Laser Marketplace 2001, 21. Juni, 2001)
LFT Import::2019-08-05 (859)

Laser in der Elektronikproduktion - News und Highlights - Schmidt, Michael (LEF 2005, Laser in der Elektronikproduktion & Feinwerktechnik, 2005)
LFT Import::2019-08-05 (1231)

Lasermaterialbearbeitung im Automobilbau - Kaufmann, S.; Fleckenstein, Marc (VDI-Z Integrierte Produktion, 2001)
LFT Import::2019-07-15 (893)

Lasermaterialbearbeitung in Erlangen - Von den Grundlagen zur Anwendung - Otto, Andreas (Laser in der Elektronikproduktion & Feinwerktechnik, 2001)
LFT Import::2019-07-15 (902)

Laser Micro Adjustment of Fiber Collimator Arrays - Zimmermann, M.; Schmidt, Michael; Rank, M.; Schaefer, L. (Proceedings of the 4th International WLT-Conference on Lasers in Manufacturing, 2007)
LFT Import::2019-08-05 (1491)

Laser Micro Adjustment Technology - Possibilities and Challenges for Novel Applications - Schmidt, Michael; Bechtold, P. (Proceedings of the 3rd Pacific International Conference on Application of Lasers and Optics 2008, 2008)
LFT Import::2019-08-05 (1519)

Laser Micro Soldering and Welding: Future-Oriented Joining Methods - Fleckenstein, Marc; Schmidt, Michael (Proceedings of the APEX 2000, March 12-16, 2000)
LFT Import::2019-08-05 (760)

Laser Micro Welding for Surface Mount Technology: High Quality for Applications in Harsh Environment - Fleckenstein, Marc (Proceedings of the IMAPS-Europe Prague 2000, June 18-20, 2000)
LFT Import::2019-08-05 (759)

Laser micro welding of copper and aluminium - Mys, I.; Schmidt, Michael (Laser-based Micropackaging, Proceedings of SPIE, 2006)
Aluminum combines comparably good thermal and electrical properties with a low price and a low material weight. These properties make aluminum a promising alternative to copper for a large number of electronic applications, especially when manufacturing high volume components. However, a main obstacle for a wide use of this material is the lack of a reliable joining process for the interconnection of copper and aluminum. The reasons for this are a large misalignment in the physical properties and even more a poor metallurgical affinity of both materials that cause high crack sensitivity and the formation of brittle intermetallic phases during fusion welding. This paper presents investigations on laser micro welding of copper and aluminum with the objective to eliminate brittle intermetallic phases in the welding structure. For these purposes a combination of spot welding, a proper beam offset and special filler material are applied. The effect of silver, nickel and tin filler materials in the form of thin foils and coatings in a thickness range 3-100 urn has been investigated. Use of silver and tin filler materials yields to a considerable improvement of the static and dynamic mechanical stability of welded joints. The analysis of the weld microstructure shows that an application even of small amounts of suitable filler materials helps to avoid critical, very brittle intermetallic phases on the interface between copper and solidified melt in the welded joints.
LFT Import::2019-08-05 (1316)
Keywords: Aluminum; Copper; Dissimilar metals; Filler material; Laser micro welding

Laser micro welding of dissimilar Cu-Al materials for electronic contacts - Mys, I.; Schmidt, Michael (Proceedings of the 4th International Conference on Laser Assisted Net Shape Engineering LANE 2004, 2004)
LFT Import::2019-08-05 (1075)

Lasers in electronics and optics manufacturing - Research at the Bavarian Laser Center - Schmidt, Michael; Geiger, Manfred (Proceedings of the 5th International Conference Beam Technologies and Laser Applications, St. Petersburg, Russland, 2006)
LFT Import::2019-08-05 (1355)

Laser Spot Welding and Soldering of Micro Components to 3-Dimensional Circuit Substrates - Ostendorf, A.; Kulik, C.; Zeadan, M.; Schmidt, Michael; Horn, Michael (5th International Congress on Molded interconnect Devices (MID), 2002)
LFT Import::2019-08-05 (1716)

Laserstrahlbasiertes Reparaturlöten für die automatisierte Nacharbeit an defekten elektronischen Baugruppen - Albert, F.; Schmidt, Michael (GMM-Fachbericht, 2004)
LFT Import::2019-07-16 (1068)

Laserstrahlbasiertes Reparaturlöten in der Elektronikproduktion - Albert, F.; Esser, G. (Tagungsband Fachtagung Optische Technologien für die Mikroproduktion, 2003)
LFT Import::2019-08-05 (973)

Laserstrahlbasiertes Reparaturlöten in der Elektronikproduktion - Albert, F.; Schmidt, Michael (LEF 2004, Laser in der Elektronikproduktion und Feinwerktechnik, 2004)
LFT Import::2019-07-16 (1071)

Laserstrahl-Mikroschweißen als alternatives Fügeverfahren zur Leadkontaktierung - Geiger, Manfred; Glasmacher, Matthias; Pucher, Hans-Jörg (Tagungsband SMT/ASIC/Hybrid 94, 1994)
LFT Import::2019-08-05 (470)

Laserstrahl-Mikroschweißen in der Cu-Leadframe-Montage: Möglichkeiten und Restriktionen - Westphäling, T.; Schmidt, Michael (LEF 2000, Laser in der Elektronikproduktion & Feinwerktechnik, 2000)
LFT Import::2019-07-15 (806)

Laserstrahlschneiden von Aluminiumschaum Sandwichmaterial - Otto, Andreas (ICCT 2002, Internationale Schneidtechnische Tagung, Hannover, 2002)
LFT Import::2019-08-05 (1698)

Laserstrahlschweißen - Trends und aktuelle Entwicklungen - Otto, Andreas; Hohenstein, Ralph (Laser Technik Journal, 2007)
LFT Import::2019-07-16 (1443)

Laser-supported rapid tooling - Tools for the manufacture of functional Components with Net Shape Properties. - Geiger, Manfred; Coremans, Arjan (Proceedings of the International Conference on Industrial Tools. Maribor, Slowenien, 21. - 22.04.1997, 1997)
LFT Import::2019-08-05 (716)

Lasertechniek in synergie met omvormtechnik - Coremans, Arjan; Geiger, Manfred (MB Produktietechniek, 1995)
LFT Import::2019-07-15 (513)

Laser Trimming of Fibre Arrays - Schmidt, Michael (Proceedings of the 1st International Symposium on Laser-Micromachining, 2006)
LFT Import::2019-08-05 (1356)

La técnica de conformación en la 41a Asamblea General del CIRP - Geiger, Manfred; Cser, L (Alambre, 1992)
LFT Import::2019-07-15 (363)

Les techniques de formage lors de la 41ème-assemblée générale du CIRP - Geiger, Manfred; Cser, L (Le tréfilé, 1992)
LFT Import::2019-07-15 (364)

Logistics from IMS towards virtual factory - Cser, L.; Geiger, Manfred (Journal of Materials Processing Technology, 2000)
This paper shows some aspects of the design and control in logistic systems of typical processes in traditional integrated systems, IMS and virtual factories in the sheet metal industry. Main components of the virtual factory are logistics and the information technology background. By globalisation of production, factory inside logistics is replaced by a global logistic concept. In this paper those logistic concepts are summarised, which can be used in designing of material flow, optimising the parameters as well as in performance evaluation for closed loop production of sheet metal processing. The information flow, connected with the material flow, is also represented in the survey. Shared data structures and telecommunication are essential parts of the control strategy in logistic systems.
LFT Import::2019-07-15 (750)

Magnetinduktive Prüfung der Halbzeugqualität in der Blechverarbeitung. - Geiger, Manfred; Engel, Ulf; Schwind, M. (Blech, Rohre, Profile, 1992)
LFT Import::2019-07-16 (1964)

Magnetinduktive Prüfung der Halbzeugqualität in der Blechverarbeitung - Geiger, Manfred; Engel, U; Schwind, M (Blech, Rohre, Profile, 1992)
LFT Import::2019-07-15 (369)

Marking of Silicate Glasses with Excimer Lasers Radiation - Influence of Glass Properties and Laser Parameters - Buerhop, C; Lutz, N; Weißmann, R; Geiger, Manfred (Proc. of the 4th European Conf. on Laser Treatment of Materials (ECLAT), Oberursel : DGM Informationsgesellschaft, 1992)
LFT Import::2019-08-05 (359)

Maschinenbau an der Universität Erlangen-Nürnberg - Kreis, Oliver (Technik in Bayern, 2007)
LFT Import::2019-07-16 (1382)

Materialbearbeitung mit Hochleistungslasern - Geiger, Manfred; Christiansen, J.; Brand, H.; Bergmann, H.W. (FLE-Symposium, 1988)
LFT Import::2019-08-05 (255)

Materialspezifische Vorraussetzung für das Lasersintern von Polyetheretherketonen als Knochenersatz für den Schädelbereich - Pohle, Dirk; Rechtenwald, T.; von Wilmowsky, Cornelius; Neukam, Friedrich Wilhelm; Münstedt, Helmut (BIOmaterialien, 2007)
LFT Import::2019-07-16 (1427)

Maximale bezogene Stempelkraft beim Hohl-Vorwärts-Fließpressen von Stahlwerkstoffen bei Raumtemperatur - Widmann, M.; Geiger, Manfred (Industrieanzeiger, 1978)
LFT Import::2019-07-15 (347)

Mechanical Properties of Three-Dimensional Laser Sintered Bone Substitutes of Polyetheretherketone - Pohle, D.; Rechtenwald, T.; Damm, Cornelia (Proceedings of 20th European Conference on Biomaterials, Nantes, France, 2006)
LFT Import::2019-08-05 (1285)

Meßapparatur für Kriechversuche unter thermisch inhomogener Belastung. - Engel, Ulf (DVM Berichts¬band der Tagung "Werkstoffprüfung 1983", 1983)
LFT Import::2019-08-05 (1956)

Metal Forming at the 41st CIRP General Assembly - Geiger, Manfred; Cser, L (Wire, 1992)
LFT Import::2019-07-15 (365)

Metal Forming at the 45th CIRP General Assembly. - Geiger, Manfred; Coremans, Arjan (Wire, 1996)
LFT Import::2019-07-15 (638)

Metal Forming Technology at the 44th CIRP General Assembly - Geiger, Manfred; Coremans, Arjan (Wire, 1995)
LFT Import::2019-07-15 (525)

Metallumformung mit dem Laserstrahl - eine Innovation mit Zukunft - Geiger, Manfred (Marktchance Individualisierung, 2003)
LFT Import::2019-07-16 (1008)

Micro Cutting of Thin Sheets with Single Mode Fiber Lasers - Zimmermann, M.; Mys, I.; Schmidt, Michael (Proceedings of the 5th International Conference on Laser Assisted Net Shape Engineering, 2007)
LFT Import::2019-08-05 (1477)

Microdeflectometry - a novel tool to acquire three-dimensional microtopography with nanometer height resolution - Häusler, Gerd; Richter, Claus; Leitz, Karl-Heinz; Knauer, Markus C. (Optics Letters, 2008)
We introduce "microdeflectometry," a novel technique for measuring the microtopography of specular surfaces. The primary data are the local slope of the surface under test. Measuring the slope instead of the height implies high information efficiency and extreme sensitivity to local shape irregularities. The lateral resolution can be better than 1 μm, whereas the resulting height resolution is in the range of 1 nm. Microdeflectometry can be supplemented by methods to expand the depth of field, with the potential to provide quantitative 3D imaging with scanning-electron-microscope-like features. © 2008 Optical Society of America.
LFT Import::2019-07-29 (1515)

Microforming - Effects of Miniaturization - Tiesler, Nicolas; Engel, Ulf (Metal Forming, 2000)
LFT Import::2019-07-15 (804)

Microforming - size effects in friction and their influence on extrusion processes - Tiesler, Nicolas (Wire, 2002)
LFT Import::2019-07-16 (1663)

Mikro-LOM-Lasergestützter Schichtaufbau in der Feinwerktechnik - Seidel, S.; Schmidt, Michael (LEF 2006, Laser in der Elektronik- & Feinwerkproduktion, 2006)
LFT Import::2019-08-05 (1331)

Modelle zur beschleunigten Simulatin des Laserstrahlumformens im Makrobereich - Pitz, Indra; Otto, Andreas (Simulation and Visualization 2008 - Proceedins of the 2008 Simulation and Visualization Conference, 2008)
LFT Import::2019-08-05 (1517)

Modelling of Laser BEam Forming of Large Sheet Metal Parts - Pitz, Indra; Otto, Andreas; Geiger, Manfred (Proceedings of the LANE 2007, 2007)
LFT Import::2019-08-05 (1436)

Modell zur Vorhersage des Werkstoffversagens durch Bruch und Verschleiß - Geiger, Manfred; Engel, U; Sobis, T; Hänsel, M (PSU: Bericht zum Workshop des Gemeinschaftsprojekts Prozeßsimulation in der Umformtechnik PSU, 1991)
LFT Import::2019-08-05 (237)

Moderne Alternativen in der Blechbearbeitung - Geiger, Manfred; Wissmeier, H. J (Werkstattstechnik, 1982)
LFT Import::2019-07-12 (173)

Moderne Blechumformung - Offen für neue fachübergreifende Denkansätze - Geiger, Manfred; Coremans, Arjan (Blech, Rohre, Profile, 1995)
LFT Import::2019-07-15 (526)

Multifunctional micro-optical elements for laser beam homogenizing and beam shaping - Bich, A.; Rieck, J.; Dumouchel, C.; Roth, S.; Weible, K. J.; Eisner, M.; Voelkel, R.; Zimmermann, M.; Rank, M.; Schmidt, Michael; Bitterli, R.; Ramanan, N.; et al. (Proc SPIE, 2008)
Refractive, diffractive and reflective micro-optical elements for laser beam shaping and homogenizing have been manufactured and tested. The presented multifunctional optical elements are used for shaping arbitrary laser beam profiles into a variety of geometries like, a homogeneous spot array or line pattern, a laser light sheet or flat-top intensity profiles. The resulting profiles are strongly influenced by the beam properties of the laser and by diffraction and interference effects at the micro-optical elements. We present general design rules for beam shaping and homogenizing. We demonstrate the application of such multifunctional micro-optical elements for a variety of applications from micro-laser machining to laser diagnostic systems.
LFT Import::2019-08-05 (1547)
Keywords: Beam homogenizer; Flat-top; Laser light sheet; Linear diffuser; MEMS; Micro-optics; Microlens arrays; Micromirrors; Spot array generator

Näherungsrechnung zur Ermittlung des Spannungs- und Bewegungszustands beim Fließen eines starrplastischen Werkstoffes - Geiger, Manfred; Steck, E (Industrieanzeiger, 1967)
LFT Import::2019-07-12 (168)

Near-Field 3D Position Sensing using Optical Fibers - Geiger, Manfred; Hohenstein, Ralph (Production Engineering Research and Development - Annals of the German Academic Society for Production Engineering, 2008)
LFT Import::2019-08-05 (1525)

Neue Entwicklungen in der Umformtechnik - Fachdokumentation des Fortschritts - Lange, K; Geiger, Manfred (Industrieanzeiger, 1968)
LFT Import::2019-07-12 (167)

Neue Konzepte zur überwachung und Regelung von Laserstrahlschweißprozessen - Otto, Andreas; Geiger, Manfred; Hohenstein, Ralph (4. Laseranwenderforum 2002, 2002)
LFT Import::2019-08-05 (1699)

Neuere Entwicklungen im Bereich der Massivumformung - Geiger, R.; Geiger, Manfred (Draht, 1977)
LFT Import::2019-07-15 (340)

Neuere Möglichkeiten zur Auslegung vorgespannter Fließpreßmatrizen - Geiger, Manfred; Lange, K. (Draht, 1978)
LFT Import::2019-07-15 (345)

Neue systemtechnische Entwicklungen im Bereich Laserstrahlhartlöten - Grimm, A.; Schmidt, Michael; Hoffmann, P. (Hart- und Hochtemperaturlöten und Diffusionsschweißen (LÖT 2007), 2007)
LFT Import::2019-07-16 (1410)

Neue Technologien in der Blechbearbeitung - Geiger, Manfred; Hoffmann, M (Tisza, M: Kardos, K: Proc. 5th Int. Conf. on Metal Forming (ICMF 91), 1991)
LFT Import::2019-08-05 (242)

Neuronale Netze in der Blechumformung - Backes, F.; Geiger, Manfred; Lenard, J.; Cser, L. (Blech, Rohre, Profile, 1995)
LFT Import::2019-07-15 (512)

Nicht-thermische Mikrojustiertechnik mittels ultrakurzer Laserpulse - Dirscherl, Manfred (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2007)
Laser micro adjustment is a very versatile and flexible technique for contact free and high accuracy positioning of single components or of systems which already are in assembled state. In this thesis, a novel process concept is investigated by theoretical and experimental research which is based on ultrashort laser pulses and therefore does not rely on thermal effects like all currently known and established laser forming method

Nonmetallic, bioactive bone replacement materials and their individual shaping by use of Selective Laser Sintering - Pohle, D.; Rupprecht, S.; Rechtenwald, T.; Münstedt, H. (Proceedings of the 17th Aachen Colloquium on Biomaterials, 4.-5. March, 2004)
LFT Import::2019-08-05 (1113)

Non-thermal Micro Adjustment Using Ultrashort Laser Pulses - Bechtold, P.; Schmidt, Michael (Journal of Laser Micro Nanoengineering, 2007)
In the field of micro technology highest accuracies have to be attained regarding position, angles and distances. To achieve this task within reasonable expenses roughly tolerated assembly followed by high-precision adjustment is often applied. As the final tolerances tend to get smaller in the same manner as the dimension of the devices common adjustment processes are reaching limits rapidly. To provide a better solution for this discrepancy the Bavarian Laser Centre investigates a new process of highly accurate, contact-free and time-efficient micro adjustment for a wide variety of materials using ultrashort laser pulses. The process mechanism is based on the effect that an ultrashort laser pulse of high intensity is able to produce plasma on the surface of the absorbing bulk material in nearly isochoric manner. The following expansion of the plasma into the confining medium excites shock waves propagating into the bulk material due to recoil effects. These shock waves, which rapidly decay to compressional waves, induce near-surface plastic deformation which results in bending the actuator's free end away from the laser beam. With suitable actuators this can be used for highly accurate adjustment. Results of previous investigations show that the bending angle can achieve accuracies in the scale of a few 10 μrad while allowing maximum deflections of a few degrees. Up to now copper, steel, silicon and pyrexglass have been successfully deformed with this process.
LFT Import::2019-07-16 (1473)
Keywords: Actuator; Laser bending; Micro adjustment; Shockwave; Ultrashort pulse laser

Non-thermical micro adjustment usind ultrashort laser pulses - Bechtold, P.; Schmidt, Michael (Proceedings of LPM2007 - The 8th International Symposium on Laser Precision Microfabrication, 2007)
LFT Import::2019-08-05 (1409)

Numerical Simulation of Metal Forming Processes for the Production of Microparts - Engel, Ulf; Messner, A. (Wire, 1998)
The application of the metal forming technology for the production of microparts is still characterized by an empirical process design. To improve this situation the numerical process simulation seems to be a suitable instrument. A simply applicable concept for a size dependent description of the flow stress is proposed which requires the experimental determination of the flow stresses of two different specimen dimensions. The application of this concept for the numerical simulation of the flat upsetting process of smallest cylindrical billets yields a force-displacement curve excellently coinciding with the experimental results.
LFT Import::2019-07-16 (1373)

Observation of process oscillations during high power laser welding - Kägeler, C.; Albert, F.; Mys, I.; Grimm, A.; Urmoneit, U. (Proceedings of the LANE 2007, 2007)
LFT Import::2019-08-05 (1445)

Optical Measurement of SMT-Leads for Optimized Assembly. - Breitenbach, Frank; Glasmacher, Matthias (Proc. of Laser Assisted Net Shape Engineering LANE 1997, 1997)
LFT Import::2019-08-05 (697)

Optical properties of plastics and their role for the modelling of the laser transmission welding process - Geiger, Manfred; Frick, T.; Schmidt, Michael (Production Engineering, 2009)
Laser transmission welding of plastics is a joining technique which permits the welding of plastic parts with low process inherent thermal and mechanical stresses. In order to compute the temperature fields during the welding process a simulation model of the process is established. Especially the optical and thermal properties of the welded materials are necessary as input parameters in order to model the process properly. While the thermal properties of polymers are well-investigated, there is little knowledge about the optical properties of plastics. The optical properties of different amorphous and semi-crystalline thermoplastics are therefore investigated in dependence on material temperature and additive concentration. Based on these data it is possible to analytically describe the absorption of laser energy in plastics. The computation of temperature fields during welding is carried out for polypropylene and the results are then compared with experimentally accomplished welding tests. The calculated results show good accordance with the experimentally determined melt pool geometries of welded specimens and prove the compatibility of the computation model with the experimental analysis. © German Academic Society for Production Engineering (WGP) 2008.
Created from Fastlane, Scopus look-up
Keywords: Laser transmission welding; Process modelling; Production process

Optimierung der System- und Prozeßtechnik beim Laserstrahlsintern von Metallpulvern zur direkten Herstellung metallischer Prototypen. - Coremans, Arjan (Berichtsband zum Abschlußkolloquium "Präzisionslaserstrahlfertigungstechnik für den Maschinenbau", 1997)
LFT Import::2019-08-05 (701)

Personalmarketing durch Firmenkontaktmessen - Kreis, Oliver; Christoph, F.; Lippert, Ch.; Schönbude, H. (Technik in Bayern, 2002)
LFT Import::2019-07-16 (1660)

Prediction of the life of bulk forming tools - Engel, Ulf (Proceedings of the 19th Riso Int. Symp. On Material Science - Modelling of Structure and Mechanics of Materials from Microscale to Product, 1998)
LFT Import::2019-08-05 (1372)

Prediction of Tool Failure from a Probabilistic Point of View - Engel, Ulf (Journal of Materials Processing Technology, 1994)
Tool performance and tool life are important criteria in the designing and optimizing of forming processes. Tool behaviour and service life can be analysed by computer aided modelling, taking the whole process into consideration. However, the result of such a process simulation is usually a single value of life time, not reflecting the high degree of its uncertainty that characterizes the life time, as is well known from practice. Thus, the necessity of taking into account the stochastic characteristics of tool life is quite evident. The objective of failure analysis should be the prediction of life time for a well defined level of confidence. A systematic approach to this problem reveals that the evolution of failure probability can be derived by quantifying the interaction of load on the tool and tool strenght, both being influenced by deterministic as well as stochastic factors. Hence, a promising way to come to a reliable failure prediction is given by the combination of mechanical/numerical methods and statistical analysis, i.e. by the integration of statistics into process simulation. The benefit of such an approach is illustrated by two examples in which statistical methods are applied to achieve an improvement of tool performance. In the first example the reduction of strenght dispersion is shown to be very effective in decreasing the failure probability. Provided that the stochastic character of both load and strenght can be quantified, the most promising measures to reduce strength dispersion can be found by process simulation. In the second example the shape optimization of a cold-forging die is considered. The effect of optimization can only be asssessed if the topographical features of the tool surface are taken into account, which can be realized by applying a combination of fracture mechanics and statistical concepts. The result is again a quantifiable probability of failure. © 1994.
LFT Import::2019-07-16 (1947)

Prediction of Tool Failure from a Probabilistic Point of View. In: Journal of Materials Processing Technology - Engel, U; Geiger, Manfred (Proc. of the Int. Conf. on Cold and Warm Forging Technology, Okt. 1992, Columbus, Ohio, USA, 1992)
LFT Import::2019-08-05 (361)

Proceedings of SPIE, Solutions for a further Miniaturization - Schmidt, Michael; Otto, Andreas (Micromachining and Microfabrication Process Technology VI. Santa Clara, USA, 2000)
LFT Import::2019-08-05 (802)

Process control in laser manufacturing - Dream or reality - Schmidt, Michael; Albert, F.; Frick, Thomas; Grimm, A.; Kägeler, C.; Rank, M.; Tangermann-Gerk, K. (ICALEO 2007 - Laser Materials Processing Conference, 2007)
Looking at the status of control techniques in laser manufacturing processes one has to focus on the sensor technique, the computing hardware and the algorithms available. Sensor technology has evolved in the last years. Now fast two-dimensional sensors like CMOS cameras can be applied whereas five year ago mostly one dimensional sensors like photodiodes were common. Even three dimensional sensors are being developed and might have a good potential in future applications. The use of such sensors has shown varying success in different processes. Thus this article deals with materials processing like welding and brazing of metals and plastics welding as well as with medical applications like cutting human tissue.
LFT Import::2019-08-05 (1494)

Process Design for Hydroforming of Lightweight Metal Sheets at Elevated Temperatures - Novotny, Stefan; Geiger, Manfred (Journal of Materials Processing Technology, 2003)
Lightweight materials like aluminium and magnesium alloys offer a high potential for weight reduction in automotive and other transportation vehicle construction. The high alloy percentages in aluminium alloys and the hexagonal structure of magnesium, however, lead to a relatively low formability of the sheet materials which can be enhanced by conducting the forming processes at elevated temperatures up to the recrystallisation temperature. This strategy is commonly used in rolling and forging, but still rises problems in sheet forming. In a research project at the chair of manufacturing technology the process of hydroforming of aluminium and magnesium sheet material shall be enhanced to be conducted at elevated temperatures. Based on material tests to determine the behaviour of different aluminium and magnesium alloys at elevated temperatures, appropriate hydroforming strategies for these materials have to be developed. Laboratory systems for the uniaxial tension test, the free hydraulic bulging of sheet material and for strip drawing, all at elevated temperatures, were built up and used as models for the design of a production system for hydroforming with a warm pressure fluid. The tests were also simulated with an FEM-system to show the restrictions and the potentials of simulation tools for this production strategy, aiming at the subsequent simulation of the complete hydroforming process. © 2003 Elsevier Science B.V. All rights reserved.
LFT Import::2019-07-15 (926)
Keywords: Aluminium; Elevated temperature; FEM simulation; Hydroforming; Lightweight construction; Magnesium

Processing of Three-Dimensional Laser Sintered Polyetheretherketone Composites and Testing of Osteoblast Proliferation in vitro - Pohle, D.; Ponader, S.; Rechtenwald, T.; Schmidt, Michael; Schlegel, K.; Münstedt, H.; Neukam, F.W.; Nkenke, E.; von Wilmowsky, C. (Macromolecular Symposia, 2007)
The following investigation focuses on polyetheretherketone (PEEK) for bone substitutes intended for maxillofacial surgery. Different three-dimensional discs with a diameter of 12 mm and a height of 3 mm were laser sintered. As filler materials nano-sized carbon black and β-tricalciumphosphate powder with an average grain size of 35 μm were used. Human osteoblasts were cultivated on the discs and examined with scanning electron microscopy. Cell vitality and cell growth was investigated. The data shows that PEEK surfaces does not suppress osteoblast proliferation. Copyright © 2007 WILEY-VCH Verlag GmbH & Co. KGaA.
LFT Import::2019-08-05 (1423)
Keywords: High performance polymers; Human osteoblast; In vitro proliferation; Laser sintering (LS); Polyetheretherketone (PEEK)

Process Integration by Hydroforming, Cutting and Laser Beam Welding in One Single Tool - Geiger, Manfred; Kreis, Oliver (Production Engineering, 2003)
LFT Import::2019-07-15 (954)

Process Sensing and Control - Otto, Andreas; Hohenstein, Ralph (Proceedings of the LANE 2007, 2007)
LFT Import::2019-08-05 (1414)

Production of microparts - size effects in bulk metal Forming, similarity theory. - Geiger, Manfred; Meßner, Arthur; Engel, Ulf (Production Engineering, 1996)
LFT Import::2019-07-15 (650)

Prozessgeregelte Mikrobearbeitung mit Laserstrahlung in der Elektronikproduktion - Geiger, Manfred; Otto, Andreas; Fleckenstein, Marc; Mys, I.; Schmidt, Michael (Produktionssysteme in der Elektronik - Sonderforschungsbereich 356 - Bericht des Forschungsverbundes 1999 - 2001, 2001)
LFT Import::2019-08-05 (867)

Prozeß- und Systemtechnik zum Laserstrahl-Mikroschweißen - Glasmacher, Mathias (Friedrich-Alexander-Universität Erlangen-Nürnberg, 1998)
Since the importance of microelectrical as well as micromechanical components as parts of industrial products is still increasing, suitable joining techniques must be available. Especially for metallic components laser micro welding offers interesting properties, e.g. high temperature strength of the joints, small-dimension capability and applicability of a broad spectrum of materials. To fulfil the high quality demands the entire processing chain has to be optimized. Within this dissertation the special example of contacting leads of housed electronic components with the tracks of the printed circuit is investigated in detail. The aim is a comprehensive provision of system as well as process related knowledge to perform controlled joining processes applying pulsed laser power. Based on FE-simulations of the temperature fields and discussion of the coupled effects of absorption and oxidation new devices and working strategies were developped. In detail, there are a module for touch-down-force related coplanarity check, a device for pulse shaping, a control for turning mirrors, a backreflection diagnosis integrated in the welding head as well as an imaging ratio-pyrometer. Applying this knowledge technological investigations were performed to join comb shaped specimen with the copper tracks on different typical substrates of the electronics production. Thereby the demands as well as the potential of this special process were derive

Qualitative und quantitative Bewertung der Crashtauglichkeit von höchstfesten Stählen - Laumann, Till (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2010)
Within this work an evaluation method was developed which allows the characterization of the deformation behaviour of high strength steels and the risk versus brittle material failure within dynamic exposure by means of a material parameter. The material parameter can be used as well for the construction as for the quality contro

Quality Assurance for Laser Beam Microbonding in Electronic Production - Geiger, Manfred; Glasmacher, Matthias; Pucher, Hans-Jörg (Production Engineering, 1994)
LFT Import::2019-07-15 (471)

Rechnerunterstützte Auslegung von Pressengestellen - Ergebnisse einer Modelluntersuchung - Geiger, Manfred (Industrieanzeiger, 1974)
LFT Import::2019-07-12 (164)

Recording of Geometrical SMD-Parameters for Optimized Assembly. - Breitenbach, Frank (Image and Multidimensional Digital Image Processing (IMDSP), Proceedings, 1998)
LFT Import::2019-08-05 (1366)

Relability Analysis of Cold Forging Tools. - Engel, Ulf (Chipless 2000 Advancing Chipless Component Manufacture, Proceedings of the 9th International Cold Forging Congress, 1995)
LFT Import::2019-08-05 (1970)

Reliability of Cold Forging Tools. - Engel, Ulf (Wire, 1997)
Tool reliability - a measure of the tool capacity to operate without failure - is an important criterion in the designing and optimization of bulk forming processes taking into account the stochastic nature of tool life. The concept of juxtaposition of load and strength including the combination of numerical process simulation and statistical methods yields an appropriate instrument not only to estimate the reliability but also to identify those primary parameters of influence controlling most significantly the tool life for a given level of confidence.
LFT Import::2019-07-15 (706)

Remote-Schweißen im Automobilbau - Schmidt, Michael; Grimm, A.; Kägeler, C. (Technik in Bayern, 2006)
LFT Import::2019-07-16 (1352)

Residual Stresses and Distortion during Laser Beam Welding - Measurement and Strategies to Minimize - Geiger, Manfred; Deinzer, G (Proceedings of the 3rd European Conference on Residual Stresses, 1992)
LFT Import::2019-07-15 (368)

Residual stresses and thermal stability of laser beam sintered metal parts. - Coremans, Arjan; Groot, D. (Proc. of Laser Assisted Net Shape Engineering LANE 1997 (1997), 1997)
LFT Import::2019-08-05 (698)

Robust and shortened process sequences for sheet light weight parts - Geiger, Manfred; Otto, Andreas (Proceedings of the Int. Workshop on Environmentally Conscious Manufacturing - Ecology and Economy in Metal Forming and Cutting (ICEM-98), 1998)
LFT Import::2019-08-05 (1593)

Schneiden von Al- und Ti-Werkstoffen mit CO2-Lasern - Juckenath, B.; Bergmann, H.W.; Geiger, Manfred (Laser/Optoelektronik in der Technik, 1989)
LFT Import::2019-07-15 (435)

Selective Laser Sintering of PEEK - Schmidt, Michael; Pohle, D.; Rechtenwald, T. (Annals of the CIRP, 2007)
Polyetheretherketone (PEEK) is a good choice especially for manufacturing medical instruments or implants. These parts are typically produced by conventional manufacturing methods, like injection moulding. Selective Laser Sintering (SLS) could offer more flexibility. It enables the direct manufacturing of products with complex geometries. Although SLS of polymers like polyamide or polystyrene is a standard industrial process already, laser sintering of PEEK remains a challenge. This article will show for SLS of PEEK the necessary adaptations in systems technology and material modifications and discuss a step-by-step process implementation. Process boundaries are shown concerning temperature and energy input. The high influence of porosity, which could be varied from zero to 15 %, on mechanical properties is shown.
LFT Import::2019-08-05 (1421)
Keywords: Biomedical; Polymer; Selective Laser Sintering (SLS)

Selective Laser Sintering of Polyetheretherketone for bone substitutes - Pohle, D.; Rechtenwald, T.; Kaschta, Joachim; Münstedt, H. (Proceedings of the 10th International Conference on Polymers in Medicine and Surgery, 6.-8. September, Cambridge, 2004)
LFT Import::2019-08-05 (1114)

Sheet Metal 2005 - Geiger, Manfred; Duflou, Joost R.; Kals, H.J.J.; Shirvani, Bez; Singh, U.P. (Trans Tech Publications Ltd, 2005)
Proceedings of the 11th International Conference on Sheet Metal 2005, held at the Friedrich-Alexander University Erlangen-Nürnberg, Germany, 08-08 April 2005. <br
Keywords: Aluminum (Al); Finite Element Model (FEM); Forming; Laser; Sheet Metal; Simulation; Welding

Sheet Metal 2007 - Micari, Fabrizio; Geiger, Manfred; Duflou, Joost R.; Shirvani, Bez; Fratini, Livan; et al. (Trans Tech Publications, 2007)
Volume is indexed by Thomson Reuters CPCI-S (WoS). Collections of peer-reviewed papers always make excellent sources of knowledge and new ideas for researchers coming from both universities and industry. The present collection in particular provides interdisciplinary and international resources, thus encouraging the close cooperation of material scientists, 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 Forming at Elevated Temperatures - Neugebauer, Stephan; Altan, T.; Geiger, Manfred; Kleiner, M.; Sterzing, A. (CIRP Annals - Manufacturing Technology, 2006)
Due to the need to significantly reduce the part weights in automotive manufacturing, the use of lightweight materials becomes ever more important. Unfortunately, these materials are often associated with a limited cold formability. Due to this fact, production of large, complex sheet metal components using forming technology frequently entails increased expenditures. Moreover, processing high-strength materials requires correspondingly high processing forces and pressures. In order to find a solution to counter the disadvantages mentioned above, the use of elevated temperatures as a process parameter in forming operations represents a potential solution approach. The following paper will give an overview about research activities in the field of forming operations at elevated temperatures.
LFT Import::2019-07-16 (1329)
Keywords: Forming; Metal; Temperature

Simulation der Versagensformen Verschleiß und Bruch bei Werkzeugen der Kaltmassivumformung - Engel, U; Hänsel, M; Sobis, T; Geiger, Manfred (Werkstatt und Betrieb, 1992)
LFT Import::2019-07-15 (362)

Simulation des Abtrags von Polyimi mit Excimerlasern - Otto, Andreas; Kickelhain, J. (LEF 2000, 2000)
LFT Import::2019-07-15 (798)

Simulation des Laserstrahlschneidens von Kunststoffen - Geiger, Manfred; Müller, R; Foerster, A (Werkstattstechnik, 1991)
LFT Import::2019-07-15 (249)

Simulation des Laserstrahlschneidens von Werkstoffen mit geringer Wärmeleitfähigkeit - Geiger, Manfred; Müller, R (Laser/Optoelektronik in der Technik, 1991)
LFT Import::2019-07-15 (248)

Simulation of Laser Beam Formng of Large Aluminium Plates - Pitz, Indra; Otto, Andreas (Thermal Forming and Welding Distortion - Proceedings of the IWOTE 2008: International Workshop on Thermal Forming and Welding Distortion, 2008)
LFT Import::2019-08-05 (1523)

Simulation of Tool Life Cycle - Cser, L.; Geiger, Manfred (Proceedings of the 26th Plenary Meeting of the ICFG, 1993)
LFT Import::2019-08-05 (380)

Simulationsgestützte Prozessauslegung für das Umformen lokal wärmebehandelter Aluminiumplatinen - Kerausch, Michael (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2007)
Tailored Heat Treated Blanks (THTB) are aluminium blanks that have locally adapted mechanical properties specifically optimized for the forming process. The strength distribution is set by a local, short-term heat treatment modifying the mechanical properties of the aluminium sheet. Hence, THTB allow enhancing forming limits significantly leading to shorter and more robust manufacture process chain

Simulation und Diagnostik beim Laserstrahlschweißen - Otto, Andreas; Graumann, C.; Kern, M.; Martinen, D.; Voß, O. (Strahl-Stoff-Wechselwirkung bei der Laserstrahlbearbeitung 2, Strahltechnik, 1998)
LFT Import::2019-07-16 (1613)

Singlemode-Faserlaser brilliert beim Feinschneiden - Zimmermann, M.; Mys, I.; Schmidt, Michael (Mikroproduktion, 2007)
LFT Import::2019-07-16 (1493)

Small scale and micro featured functional prototypes generated by laser sintering of polyetheretherketone - Rechtenwald, T.; Krauß, H.J.; Pohle, D.; Schmidt, Michael (Proceedings of the XII. Conference on Micromachining and Microfabrication Process Technology, San Jose (USA), 22.-24., 2007)
Functional prototypes produced via laser sintering already address the sub millimeter region with resolutions in the low micrometer range. The manufacturing process is very suitable for small scale, micro featured functional polymer parts because of its ability to generate complex and fine shaped geometries including undercuts and pores. The parts are built up layer by layer from three-dimensional data generated by CAD programs or by micro computer tomography as a copy of already existing parts. Up to now this field is dominated by polyamide, a semi-crystalline polymer. This thermoplastic material covers a wide range of applications but requirements concerning a high temperature resistance above 200 °C and tensile strengths above 50 N/mm 2 are not fulfilled despite glass fillings. A change in the sintering material can solve this issue. Investigations show that polyetheretherketone (PEEK) which is a high performance polymer with a melting temperature of 346°C can be used for laser sintering. Manufacturing small sized and micro featured parts with enhanced temperature and mechanical properties is possible using an adapted system technology. For minimum vertical outer features a value of about 250 μm was found, expanded outer features like walls show a width of 650 μm. A first low boundary for hole-diameters in the feeding 3D-data set was found. As a basic boundary for minimum geometrical features a core roughness average of about 23.3 μm could be measured.
LFT Import::2019-08-05 (1426)
Keywords: Functional prototypes; Laser sintering; PEEK; Polyetheretherketone; Polymer; Rapid prototyping; SLS

Sommerfest der Technischen Fakultät - Kreis, Oliver; Heuler, A. (Technik in Bayern, 2005)
LFT Import::2019-07-16 (1207)

Stand und Entwicklungstendenzen bei der Laseranwendung in der Blechbearbeitung - Geiger, Manfred; Coremans, Arjan (Blechbearbeitung, VDI Berichte, 1994)
LFT Import::2019-08-05 (463)

Starker Anstieg an Bewerberzahlen an der Uni Erlangen-Nürnberg - Geiger, Manfred; Kreis, Oliver (t&m - Technologie & Management, 2002)
LFT Import::2019-07-16 (1666)

STING - aktiv für Studenten und Jungingenieure (Interview) - Kreis, Oliver (Siemens-Welt, 2002)
LFT Import::2019-07-16 (1712)

Strength Improvement of Cemented Carbides by Hot Isostatic Pressing (HIP) - Engel, Ulf; Hübner, H. (Journal of Materials Science, 1978)
HIP treatment after sintering increases the strength of the investigated cemented carbide alloy by a factor of two whereas hardness, fracture toughness, and work of fracture remain unchanged. HIP does not affect the microstructural parameters of the carbide skeleton and the binder phase, but the residual pores are eliminated entirely. Failure of both the as-sintered and post-densified material occurs by a pure Griffith mechanism. The strength-flaw size relationship is established experimentally and is shown to obey exactly Griffith's basic strength equation. The strength is controlled by the largest microstructural defects, i.e. pores in the as-sintered material, and coarse WC grains and inclusions in the HIP-treated specimens. © 1978 Chapman and Hall Ltd.
LFT Import::2019-07-16 (1793)

Strength vs Load -A General Concept to Estimate and to Improve the Reliability of Tools in Bulk Metal Forming - Engel, Ulf (): ICIT’97 Conference Procee¬dings (Int.Conf.on Industrial Tools, April 21-22,1997 Maribor, Slov) Vol. I, Celje Slovenia, 1997)
None
LFT Import::2019-08-05 (1982)

Synergies of laser material processing and metal forming - Geiger, Manfred; Otto, Andreas (Characterization of Manufacturing, Proceeding of the Workshop, Ljubljana 25-26. Mai, Processes: Synergetics and Data Processing Methods, 2000)
LFT Import::2019-08-05 (773)

Synergy of Laser Material Processing and Metal Forming - Geiger, Manfred (CIRP Annals - Manufacturing Technology, 1994)
It will be shown, on the basis of selected examples in the field of metal forming, how metal forming and laser beam processing can be combined in a synergetic way. A characteristic of metal forming is its ability for large scale manufacturing with high quality. Laser material processing is characterized by a high process, product, and quantity flexibility. Synergetic combinations of both processes enable completely new solutions for products and technologies. Although most of these developments are still in their initial phase, the first industrial applications have already proved their potential economical viability. © 1994 CIRP.
LFT Import::2019-07-15 (459)
Keywords: Forming; Laser Material Processing; Sheetmetal

Systemanalyse des dynamischen Prozessverhaltens beim Laserstrahlschweißen - Hohenstein, Ralph; Otto, Andreas; Geiger, Manfred (Strahl-Stoff-Wechselwirkung bei der Laserstrahlbearbeitung 2, Strahltechnik, 1998)
LFT Import::2019-07-16 (1607)

Tailored Blanking mit Kernverbunden aus aufschäumbaren Aluminiumhalbzeug - Otto, Andreas (Symposium Metallschäume, 2000)
LFT Import::2019-08-05 (749)

Tailored Blankingwith AFS - Welding Unfoamed AFS Precursor Material - Schöberl, T.; Otto, Andreas (International Conference on Metal Foams and Porous Metal Structures, 2001)
LFT Import::2019-08-05 (841)

Tailored Blanks aus Aluminium Foam Sandwich - Braune, Robert; Beichert, C; Otto, Andreas (UTF-Science, 2000)
LFT Import::2019-07-15 (748)

Techniken in der Klein- und Mittelserienfertigung von Blechteilen - Geiger, Manfred; Geißler, U (Technische Rundschau, 1991)
LFT Import::2019-07-15 (239)

Technological Comparison of CO2- and Nd:YAG-Laser Manufacturing Systems - Geiger, Manfred; Gropp, A; Hoffmann, P (Proc. of Laser Applications in the Automotive Industries (25th ISATA), 1992)
LFT Import::2019-08-05 (373)

Technologieintegration zur Herstellung von Serienwerkzeugen mittels Metallfolien - LOM - Seidel, S. (RTejournal - Forum für Rapid Technologie, 2007)
LFT Import::2019-07-16 (1481)

Tecnica della formatura alla 41a Assemblea Generale del CIRP - Geiger, Manfred; Cser, L (Il filo metallico, 1992)
LFT Import::2019-07-15 (366)

Temperaturfeldberechnungen beim Laserstrahlschweißen von Kunststoffen - Frick, Thomas (Laser in der Elektronikproduktion & Feinwerktechnik 2007, Tagungsband LEF 2007, 2007)
LFT Import::2019-08-05 (1484)

Temperaturfest kontaktieren - Geiger, Manfred; Schmidt, Michael (Laser-Praxis, 1998)
LFT Import::2019-07-16 (1596)

Temperaturgeregeltes Laserstrahlhartlöten mit Hochleistungsdiodenlasern - Grimm, A. (DVS-Berichtsband - Tagungsband zur 6. Jenaer Lasertagung 2008, 2008)
LFT Import::2019-08-05 (1555)

Theoretische und experimentelle Untersuchungen zum Kriech¬verhal¬ten thermisch inhomogen belasteter hohlzylindrischer Prüfkörper. - Engel, Ulf; Illschner, B. (Zeitschrift für Werkstofftechnik, 1986)
LFT Import::2019-07-16 (1950)

Thermoelement- Sensorik- ein Lagesensor für CO2- Hochleistungslaser - Geiger, Manfred; Hutfless, J; Hoffmann, P (Strahltechnik (3. Int. Konferenz Strahltechnik, Karlsruhe), DVS- Bericht, 1991)
LFT Import::2019-08-05 (245)

Three Dimensional Simulation of Laser Beam Welding - Koch, Holger Michael; Leitz, Karl-Heinz; Otto, Andreas (Proceedings of the LANE 2007, 2007)
LFT Import::2019-08-05 (1444)

Tool Life and Tool Quality - A Status Report of the ICFG Subgroup - Cser, L.; Racz, P.; Engel, Ulf (ICIT'97 Conference Proceedings, Int. Conf. on Indusrial Tools, 1997 Maribor, Slov, April 21-22, 1997)
LFT Import::2019-08-05 (704)

Tool Life and Tool Reliability in Bulk Metal Forming. - Engel, Ulf (Int. Conf. and Exhibition on Design and Production of Dies and Molds (Istanbul, Turkey, June 19-21, 1997). Ankara, Turkey, 1997)
LFT Import::2019-08-05 (708)

Tool Life und Tool Quality in Bulk Metal Forming - Cser, L.; Lange, K.; Geiger, Manfred; Kals, J.A.G. (Wire, 1993)
LFT Import::2019-07-15 (390)

Tool Quality in Bulk Metal Forming - Cser, L.; Geiger, Manfred; Lange, K.; Kals, J.A.G. (Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 1993)
LFT Import::2019-07-15 (384)

Towards Clean Forming Techniques (Keynote Paper) - Geiger, Manfred (Annals of the CIRP, 1995)
LFT Import::2019-08-05 (517)

Towards Extended Free-Standng Crystalline Silicon Thin-Films by Laser Joining - Kunz, T.; Burkert, I.; Zimmermann, M. (22nd European Photovoltaic Solar Energy Conference, 2007)
LFT Import::2019-08-05 (1479)

Towards Zero-Defect Manufacturing of Small High-Precision Metal Parts - Ravenswaaij, R.; van Tijum, R.; Hora, P.; van den Boogaard, T.; Engel, Ulf (Towards Zero Failure Production Methods by Advanced Modeling Techniques and a Process Integrated Virtual Control, 2013)
LFT Import::2019-08-05 (1933)

Transiente Prozesse beim Laserstrahlschneiden - Otto, Andreas; Geiger, Manfred (Strahl-Stoff-Wechselwirkung bei der Laserstrahlbearbeitung 2, Strahltechnik, 1998)
LFT Import::2019-07-16 (1614)

Trend in laser technology for electronics production and precision mechanics - Otto, Andreas (LANE 2001, Proceedings of Laser Assisted Net Shape Engineering 3, 2001)
LFT Import::2019-08-05 (903)

Tribology in Microforming - Engel, Ulf (ICTMP 2004, Proceedings of the 2nd International Conference on Tribology in Manufacturing Processes, Nyborg, Denmark, 2004)
LFT Import::2019-08-05 (1102)

Tribology in Microforming. - Engel, Ulf (Wear, 2006)
As the tribological conditions between tool and workpiece in metal working are of greatest importance for process feasibility and process quality this is even more true when the process is scaled from conventional down to micro dimensions. As can be shown by scaled friction tests the friction is increased by a factor of 20 and more which will have a distinct impact on all factors characterising the process. This cannot be described by the conventionally used friction laws but can be explained by the model of open and closed lubricant pockets characterising the surface topography. In the present paper, it will be shown that - starting from this model - the size effect in friction can be described by the general friction law developed by Wanheim/Bay. © 2005 Elsevier B.V. All rights reserved.
LFT Import::2019-07-16 (1969)
Keywords: Friction law; Microforming; Size effect; Tribology

Ultrashort Pulse Laser Bending - Dirscherl, Manfred; Eßer, Gerd; Schmidt, Michael (Journal of Laser Micro Nanoengineering, 2006)
Accurate positioning of smallest components represents an up-to-date key assignment in micro-manufacturing. It has proven to be most time and cost efficient to initially assemble the components with widened tolerances before precisely micro-adjusting them in a second step. The use of laser induced contact-free deformations for micro-adjustment of functional components such as recording heads or sensors has already been established for several industrial applications. The fact, however, that laser bending or shrinking processes normally rest upon thermal tensions has been found unfavorable. To overcome the drawbacks of thermal laser bending, such as time consuming cooling periods or thermally induced damage, a new laser micro-adjustment method, based on a fundamentally different mechanism is currently being researched and qualified. Instead of temperature gradients, specific effects achievable by surface structuring with ultrafast laser systems are utilized to achieve highly accurate micro-deformations. To explain the background of this novel technique, fundamental particularities of ultrashort-pulse laser material interactions are discussed using both theoretical models and practical observations. Results from extensive experimental studies are presented, revealing the potential of micro-adjustment with ultrafast lasers, concerning its precision, range and positioning speed.
LFT Import::2019-07-16 (1274)
Keywords: Laser bending; Laser micromachining; Light matter interaction; Micro-adjustment; Shockwaves; Ultrashort pulse laser

Umformen in der Fertigungstechnik - Entwicklungstendenzen bei Verfahren und Maschinen - Lange, K.; Geiger, Manfred; et al. (Industrieanzeiger, 1971)
LFT Import::2019-07-11 (154)

Umformtechnik auf der 41. CIRP- Generalversammlung - Geiger, Manfred; Cser, L (Umformtechnik 25/4, 1991)
LFT Import::2019-08-05 (236)

Umformtechnik auf der 42. CIRP-Generalversammlung - Geiger, Manfred; Cser, L. (Umformtechnik, 1993)
LFT Import::2019-07-15 (388)

Umformtechnik auf der 44. CIRP-Generalversammlung. - Geiger, Manfred; Coremans, Arjan (Blech, Rohre, Profile, 1995)
LFT Import::2019-07-15 (527)

Umformtechnik auf der 45. CIRP-Generalversammlung. - Geiger, Manfred; Coremans, Arjan (Blech, Rohre, Profile, 1995)
LFT Import::2019-07-15 (528)

Umformtechnische Herstellung metallischer Kleinstteile - Werkstoffverhalten und Wirkflächenreibung - Geiger, Manfred; Meßner, Arthur; Engel, Ulf (Tagungsband 2. Sächsische Fachtagung Umformtechnik, 1995)
LFT Import::2019-08-05 (1984)

Untersuchung der prozessbestimmenden Strahl-Stoff-Wechselwirkungen beim Laserstrahlschweißen von Kunststoffen - Frick, Thomas (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2007)
The purpose of this study is an optimization of the contour Lasar polymer welding process in terms of improved gap bridging capability, Based on the investigation of the Laser beam / matter interaction a FE-based process simulation model is established, which allows the investigation of alternative radiation strategies. It can be demonstrated that an improved gap bridging capability is possible by using a line-shaped focal geometr

Untersuchungen an einem Gestellmodell - Roll, K.; Felgner, W.; Geiger, Manfred (Industrieanzeiger, 1975)
LFT Import::2019-07-15 (331)

Untersuchungen zum Blechbiegen mit elastischem Werkzeug - Geiger, Manfred; vom Ende, Arnold; Engel, Ulf (Blech, Rohre, Profile, 1992)
LFT Import::2019-07-15 (480)

Untersuchung und Berechnungen der Spannungen und Verformungen von mechanisch weggebundenen Pressen. Beitrag zur rechnerunterstützten Auslegung von Pressgestellen - Geiger, Manfred (VDW-Bericht, 1975)
LFT Import::2019-07-12 (169)

Use of pre-pulse in laser spot welding of materials with high optical reflection - Mys, R.; Geiger, Manfred (Laser Precision Microfabrication LPM 203, Proceedings of SPIE, 2003)
Laser micro welding has become a standard manufacturing technique, particularly in industry sectors, such as automotive and aerospace electronics or medical devices, where the requirements for strength, miniaturization and temperature resistance are constantly rising. So far the use of laser micro welding is limited due to the fluctuation of the quality of the welded joints, because the welding results for material with high optical reflection and thermal conductivity, such as copper and copper alloys, depend very strongly on the condition of the material surface. This paper presents investigations on the use of a laser pre-pulse in spot welding of electronic materials with Nd:YAG laser. In order to achieve reproducible joining results two strategies are followed-up. The first one utilizes a reflection-based process control for measuring the reflection during the short pre-pulse. The intensity of the reflected light is used to calculate an appropriated welding pulse power, which corresponds to the measured relative absorption. Adjustment of laser parameters according to the condition of the surface is done in real time before laser main pulse. A second possibility for the stabilization of copper welding is the employment of a short and powerful laser pre-pulse before laser main pulse. This pre-pulse affects the workpiece surface and creates more reproducible absorption conditions for the main pulse, independent from the initial situation on material surface.
LFT Import::2019-08-05 (1009)
Keywords: Laser micro welding; Pre-pulse; Process control; Sensors

Using test plans for bayesian modeling - Deventer, Rainer; Denzler, Joachim; Niemann, Heinrich; Kreis, Oliver (Machine Learning and Data Mining in Pattern Recognition, 2003)
When modeling technical processes, the training data regularly come from test plans, to reduce the number of experiments and to save time and costs. On the other hand, this leads to unobserved combinations of the input variables. In this article it is shown, that these unobserved configurations might lead to un-trainable parameters. Afterwards a possible design criterion is introduced, which avoids this drawback. Our approach is tested to model a welding process. The results show, that hybrid Bayesian networks are able to deal with yet unobserved in- and output dat
Keywords: Bayesian network; Laserbeam welding; Manufacturing process; Modeling

Verallgemeinerte Ansätze der elementaren Plastizitätstheorie zur Kraftberechnung bei Umformvorgängen - Geiger, Manfred; Geiger, R. (Industrieanzeiger, 1973)
LFT Import::2019-07-12 (159)

Verbesserung der Arbeitsgenauigkeit bei der Herstellung von Blechteilen mit U-förmigen Querschnitt durch Biegen mit elastischer Matrize - vom Ende, Arnold; Engel, Ulf; Geiger, Manfred (Blech, Rohre, Profile, 1989)
LFT Import::2019-07-15 (442)