Wear Behavior of MoS₂ Lubricant Layers during Sheet Metal Forming

verfasst von

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.

Organisationseinheit(en)

Institut für Umformtechnik und Umformmaschinen
Institut für Werkstoffkunde

Typ

Konferenzaufsatz in Fachzeitschrift

Journal

Procedia Engineering

Band

183

Seiten

357-362

Anzahl der Seiten

6

ISSN

1877-7058

Publikationsdatum

28.04.2017

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Allgemeiner Maschinenbau

Elektronische Version(en)

https://doi.org/10.1016/j.proeng.2017.04.052 (Zugang: Offen)

 

Details im Forschungsportal „Research@Leibniz University“