Steitz, Manuel ; Klasen, Paul ; Groche, Peter (2015)
Wear behavior of hammer peened surface textures during strip drawing test.
Proceeding of the 34th International Deep Drawing Research Group Conference.
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Kurzbeschreibung (Abstract)

In order to realize an adequate flow of material in deep drawing, low friction and wear should prevail in the area of the blank holder and drawing radius. One approach to meet this requirement is the micro-texturing and subsequent coating of the relevant tool surface. Although the tribological advantages of these resulting micro lubricant pockets are well known 1-3, the texturing of drawing tools is not yet established due to the extensive processing efforts. In this regard, the new surface treatment technology of machine hammer peening (MHP) is able to reduce the processing time in tool production 4 while at the same time micro-texturing the surface.The friction reducing effect of these deterministically positioned and geometrically defined lubricant pockets has been proven in prior studies 5. However, an industrial application of this micro-texturing process is only expedient if the tribologically advantageous effect is long-term stable. Therefore, this paper studies the wear resistance of hammer peened lubricant pockets during loads similar to those of deep drawing with the help of a long-term strip drawing test. Here, a sheet metal strip is pulled through a (textured) cylinder-plane-shaped tool system under defined tribological conditions. With this setup, the local geometrical changes of the lubricant pockets and the global wear development for both coated and uncoated micro-textured tools are evaluated. Afterwards, the wear is compared to a polished sample (reference). Ultimately, the results of the study show that micro-texturing of drawing tools by MHP is tribologically useful and suitable for industrial applications.

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