Wear Behavior of MoS₂ Lubricant Layers during Sheet Metal Forming

authored by: Bernd Arno Behrens, Hans Jürgen Maier, Sven Hübner, Christian Bonk, Amer Almohallami, Christin Lummer, Patrick Schein, Hannes Scheland, Moritz Micke-Camuz
Abstract: The increased use of high and ultra-high strength steel and materials with a high adhesion tendency leads to higher demands regarding the wear resistance of forming tools. A promising approach addressing both challenges is to apply MoS₂ dry film lubricant coating systems to the tool surface. These coatings reduce friction and the use of drawing oils and can also be used as an abherent. Once these coatings are exhausted, they can be chemically removed and reapplied. However, the tool life of the coatings cannot be predicted properly, due to their inhomogeneous wear behavior which depends on the forming parameters and differs locally. Moreover, there are carryover effects of MoS₂-particles to already ablated areas. Given the unpredictability of the wear of dry film lubricant coatings, it is not possible to plan the recoating cycles appropriately and thus, the potential of these coatings for commercial applications is limited. In this research, the wear behavior of MoS₂-layers in deep drawing processes was investigated on a test stand with DP800+Z coil material which ensures realistic load conditions at the draw ring radius. Firstly, the wear pattern was determined and locally different contact pressures were recorded and assigned to respective wear areas. Due to bending effects of the sheet material, there are two major areas of wear on the draw ring radius. During wear tests, the wear-dependent coating thickness during wear initiation was determined by using 3D laser scanning microscopy and the friction force was evaluated.
Organisation(s): Institute of Metal Forming and Metal Forming Machines
Institute of Materials Science
Type: Conference article
Journal: Procedia Engineering
Volume: 183
Pages: 357-362
No. of pages: 6
ISSN: 1877-7058
Publication date: 28.04.2017
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: General Engineering
Electronic version(s): https://doi.org/10.1016/j.proeng.2017.04.052 (Access: Open)
: Details in the research portal "Research@Leibniz University"

BibTeX

@article{ca561fc20aa24a8a87b8692909a12f28,
title = "Wear Behavior of MoS2 Lubricant Layers during Sheet Metal Forming",
abstract = "The increased use of high and ultra-high strength steel and materials with a high adhesion tendency leads to higher demands regarding the wear resistance of forming tools. A promising approach addressing both challenges is to apply MoS2 dry film lubricant coating systems to the tool surface. These coatings reduce friction and the use of drawing oils and can also be used as an abherent. Once these coatings are exhausted, they can be chemically removed and reapplied. However, the tool life of the coatings cannot be predicted properly, due to their inhomogeneous wear behavior which depends on the forming parameters and differs locally. Moreover, there are carryover effects of MoS2-particles to already ablated areas. Given the unpredictability of the wear of dry film lubricant coatings, it is not possible to plan the recoating cycles appropriately and thus, the potential of these coatings for commercial applications is limited. In this research, the wear behavior of MoS2-layers in deep drawing processes was investigated on a test stand with DP800+Z coil material which ensures realistic load conditions at the draw ring radius. Firstly, the wear pattern was determined and locally different contact pressures were recorded and assigned to respective wear areas. Due to bending effects of the sheet material, there are two major areas of wear on the draw ring radius. During wear tests, the wear-dependent coating thickness during wear initiation was determined by using 3D laser scanning microscopy and the friction force was evaluated.",
keywords = "3D-Laserscan measurement, Dry film lubricant coatings, wear behavior, wear initiation",
author = "Behrens, {Bernd Arno} and Maier, {Hans J{\"u}rgen} and Sven H{\"u}bner and Christian Bonk and Amer Almohallami and Christin Lummer and Patrick Schein and Hannes Scheland and Moritz Micke-Camuz",
year = "2017",
month = apr,
day = "28",
doi = "10.1016/j.proeng.2017.04.052",
language = "English",
volume = "183",
pages = "357--362",
journal = "Procedia Engineering",
issn = "1877-7058",
publisher = "Elsevier BV",
note = "17th International Conference on Sheet Metal, SHEMET 2017 ; Conference date: 10-04-2017 Through 12-04-2017",
}

Wear Behavior of MoS2 Lubricant Layers during Sheet Metal Forming

Wear Behavior of MoS₂ Lubricant Layers during Sheet Metal Forming