Adaption of tribological behavior of a-C:H coatings for application in dry deep drawing

Journal article
(Online publication)

Publication Details

Author(s): Häfner T, Rothammer B, Tenner J, Krachenfels K, Merklein M, Tremmel S, Schmidt M, Schmidt M
Editor(s): MATEC Web of Conferences
Journal: MATEC Web of Conferences
Publisher: EDP Sciences
Publication year: 2018
Volume: 190
Conference Proceedings Title: 5th International Conference on New Forming Technology (ICNFT 2018)
Pages range: 1 - 10
ISSN: 2261-236X
Language: English


Nowadays the sheet metal forming industry faces challenges regarding efficient usage of resources and sustainability. One strategy to increase the environmental friendliness is to abandon the application of lubricants. The direct contact between tool and workpiece leads to an intensive interaction which increases friction. Especially for deep drawing processes with long sliding distances, this causes distinctive wear. The tool sided application of carbon based coatings is a well-known approach to reduce friction and wear. Former studies have shown a beneficial behavior of hydrogenated amorphous carbon based coatings (a-C:H) to improve the tribological conditions in contact with steel sheets and aluminium alloys under dry conditions. Within this study the coating process and the resulting coating properties will be analyzed. Afterwards mechanical and laser based surface treatment processes prior and after the deposition process will be investigated to reduce the coating roughness. Different roughness values were achieved by varying the surface treatment processes. The laser based finishing enables a reduction of the Spk values by removing single roughness asperities. In order to identify the necessary process parameters for the laser treatment, an analytical model of the material removal was applied. The laser surface treatment achieved similar roughness characteristics compared to mechanical treatment. In this study the tribological behavior of a-C:H coated tools was analyzed under dry conditions within strip drawing tests. The tribological investigations revealed that for dry deep drawing of zinc coated DC04 a broader range of Spk values leads to acceptable tribological conditions whereas for AA5182 a smoother tool surface has to be ensured to prevent adhesion and utilize the full potential of a-C:H coatings.

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

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

External institutions with authors

Bayerisches Laserzentrum gemeinnützige Forschungsgesellschaft mbH (BLZ)

How to cite

Häfner, T., Rothammer, B., Tenner, J., Krachenfels, K., Merklein, M., Tremmel, S.,... Schmidt, M. (2018). Adaption of tribological behavior of a-C:H coatings for application in dry deep drawing. MATEC Web of Conferences, 190, 1 - 10.

Häfner, Tom, et al. "Adaption of tribological behavior of a-C:H coatings for application in dry deep drawing." MATEC Web of Conferences 190 (2018): 1 - 10.


Last updated on 2019-07-02 at 11:37