Krachenfels Kim
Kim Krachenfels, M. Sc.
Profile
Projects
Lubricant free forming with tailored tribological conditions
(Third Party Funds Group – Sub project)Theincreasing demand for environmentally friendly and economical processesmotivates research into lubricant-free deep drawing. This shortens the processchain by omitting the application of lubricants and the cleaning of components.The central challenges in lubricant-free forming are substantial increases infriction and tool wear due to direct workpiece-to-tool contact. In thiscontext, the objective is to reduce wear and friction by means of tool-sidedcoatings. On a newly developed application-oriented test rig, it has beenproven that these modifications are suitable for the wear-free production ofmore than 3,000 components and thus a significant increase in tool lifecompared to uncoated tools.
Lubricant free forming with tailored tribological conditions
(Third Party Funds Group – Sub project)Within lubricant free forming an intensive interaction of workpiece and tool surface occurs. The aim of this research project is the realization of dry forming processes by developing and applying innovative tribological systems. The challenges of dry forming such as increased friction accompanied by increased wear are met by tool based surface modifications in a tailored tool approach. In the first period of the project forming of steel sheets is investigated in a lubricant-free deep drawing process. In order to test the transferability of derived correlations to other workpiece material classes also an aluminum alloy is tested. In basic experiments under laboratory conditions the fundamental understanding of lubricant free forming is generated by the analysis and description of the occurring tribological effects. At the same time the test results serve as input values for the simulation based design of the segmented tool for manufacturing the demonstrator cup. In the FE simulation tribological relevant tool areas are identified. Subsequently, required surface properties for each tool segment are derived in an inverse approach. The requirements represent the targets for the development of tailored surface modifications. In order to guarantee reasonable wear resistance the suitability of DLC coating systems for lubricant free deep drawing is assessed. In some tool areas lubricant free forming requires an extraordinary high wear resistance of the coatings. In this regard the laser induced heat treatment of DLC coatings is investigated for the local enhancement of wear resistance. Furthermore, for the purpose of controlling the material flow tool based surface structures will be developed and applied by laser ablation. While developing the surface coatings and structures the frictional and wear behavior of the different modification types are investigated by carrying out model tests under laboratory conditions. In particular, the influences of the factors tool material, surface structure and coating on the tool behavior are quantified. For determination of the limits of dry forming process the interactions of tool behavior and occurring process loads are investigated in the laboratory tests. The derived correlations between the process loads, the surface modifications and the resulting tool behavior are used for the local adjustment of the tribological conditions within the lubricant free model process. In order to validate these correlations the friction and wear behavior of the segmented tool is determined in the deep drawing process for the investigated steel and aluminum grade. The results of the first period of the project represent the basis for qualification of tailored tribological systems for the application in lubricant free forming processes.
Publications
2020
Lubricant free forming with tailored tribological conditions
In: Dry Metal Forming Open Access Journal 6 (2020), p. 228-261
Open Access: https://www.trockenumformen.de/app/download/10606371/DMFOAJ_6_2020_228-261_Henneberg.pdf
URL: https://www.archiv.mfk.tf.fau.de?file=pubmfk_5eecb95410d59 , , , , , , , , , :
2019
Analysis of tribological behavior of surface modifications for a dry deep drawing process
In: Dry Metal Forming Open Access Journal 5 (2019), p. 13-24
Open Access: https://www.trockenumformen.de/publikationen/dmfoaj-2019/
URL: https://www.archiv.mfk.tf.fau.de?file=pubmfk_5de11a374a235
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Experimental investigation of tool-sided surface modifications for dry deep drawing processes at the tool radii area
In: Procedia Manufacturing 29 (2019), p. 201-208
ISSN: 2351-9789
DOI: 10.1016/j.promfg.2019.02.127
URL: https://www.archiv.mfk.tf.fau.de?file=pubmfk_5cb878045af3a
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Influence of varying sheet material properties on dry deep drawing process
In: IOP Conference Series: Materials Science and Engineering 651 (2019), p. 1-8
ISSN: 1757-8981
DOI: 10.1088/1757-899X/651/1/012012
URL: https://www.archiv.mfk.tf.fau.de?file=pubmfk_5de0c762989e3
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Investigation of the tribological performance of a-C:H coating systems by modifying adhesive layer for application in dry deep drawing
International Tribology Conference Sendai 2019 (Sendai, 17. September 2019 - 21. September 2019)
URL: https://www.archiv.mfk.tf.fau.de?file=pubmfk_5db14676ba9fc
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Laser based techniques to adapt the tribological conditions in dry deep drawing
International Conference on Advanced Optical Technologies (Erlangen, 13. March 2019 - 15. March 2019)
URL: https://www.archiv.mfk.tf.fau.de?file=pubmfk_5db142cda21ed , , , , , , :
2018
Adaption of tribological behavior of a-C:H coatings for application in dry deep drawing
In: MATEC Web of Conferences 190 (2018), p. 1 - 10
ISSN: 2261-236X
DOI: 10.1051/matecconf/201819014002
URL: https://www.archiv.mfk.tf.fau.de?file=pubmfk_5bb2fd875f1a8
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Nachhaltige Blechumformung durch Trockentiefziehen
In: wt Werkstattstechnik - Online 108 (2018), p. 652-656
ISSN: 1436-4980
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Influence of laser generated micro textured coated tool surfaces on dry deep drawing processes
In: Dry Metal Forming Open Access Journal 4 (2018), p. 35 - 46
Open Access: http://www.drymetalforming.de/
URL: https://www.archiv.mfk.tf.fau.de?file=pubmfk_5a869448addd0 , , , , , , , :