Influence of laser generated micro textured coated tool surfaces on dry deep drawing processes

Journal article
(Original article)

Publication Details

Author(s): Tenner J, Häfner T, Rothammer B, Krachenfels K, Zhao R, Schmidt M, Tremmel S, Merklein M
Editor(s): Frank Vollertsen
Journal: Dry Metal Forming Open Access Journal
Publication year: 2018
Volume: 4
Conference Proceedings Title: 4
Pages range: 35 - 46
Language: English


The idea of sustainability and resource conservation promotes the development of energy-efficient and low-emission production processes. A lubricant-free sheet metal forming process is considered as one of these environmentally friendly production technologies. Metal forming processes without conventional lubricants shorten process steps and reduce additional costs, such as removal of residual lubrication from the workpiece after forming. In order to realize such a dry forming process and effectively control the material flow, amorphous carbon coatings were applied to the tool surfaces and a brushing process was carried out as a surface finishing process for roughness adjustment. Laser generated micro features on the surface should make an effective contribution to local friction adaptation. The transferability of strip drawing test to strip bending rotation test was successfully demonstrated by dry and oiled blank reference tests. The first modification of the tool sided surface was achieved by applying ta-C and a-C:H layers. The influence of the coatings on the tribological behaviour was determined in strip drawing tests for DC04 and AA5182. Additional friction adaptation is made possible by the fine and flexible laser based micro texturing of the coated tool surface. Experiments were carried out with different coverage and depth of the laser generated features in order to analyze the tribological influence. Flat and deep features with a degree of coverage of 20 %, 35 % and 50 % are considered in order to analyze the factors influencing their tribological behavior. Compared to ta-C coated references, it can be seen that micro features on the ta-C coated tool surface causes a friction reduction for DC04, independent of the features depth. However, deep laser generated features in particular lead to an increase in friction for AA5182, so that this could potentially lead to a selective local increase in friction in the flange area. For the transferability of the tribological system from the flat application case to a curved tool surface, the basics for laser based texturing of cylinder surfaces are illustrated. The limits of the holographic beam shaping technology used for this are demonstrated.

FAU Authors / FAU Editors

Häfner, Tom
Lehrstuhl für Photonische Technologien
Krachenfels, Kim
Institute of Manufacturing Technology
Merklein, Marion Prof. Dr.-Ing.
Institute of Manufacturing Technology
Rothammer, Benedict
Lehrstuhl für Konstruktionstechnik
Schmidt, Michael Prof. Dr.-Ing.
Lehrstuhl für Photonische Technologien
Tenner, Jennifer
Institute of Manufacturing Technology
Tremmel, Stephan Dr.-Ing.
Lehrstuhl für Konstruktionstechnik
Zhao, Rong
Lehrstuhl für Konstruktionstechnik

Additional Organisation
Institute of Manufacturing Technology
Lehrstuhl für Konstruktionstechnik
Lehrstuhl für Photonische Technologien

Research Fields

Neue Materialien und Prozesse
Research focus area of a faculty: Technische Fakultät

How to cite

Tenner, J., Häfner, T., Rothammer, B., Krachenfels, K., Zhao, R., Schmidt, M.,... Merklein, M. (2018). Influence of laser generated micro textured coated tool surfaces on dry deep drawing processes. Dry Metal Forming Open Access Journal, 4, 35 - 46.

Tenner, Jennifer, et al. "Influence of laser generated micro textured coated tool surfaces on dry deep drawing processes." Dry Metal Forming Open Access Journal 4 (2018): 35 - 46.


Last updated on 2018-06-08 at 14:11