Influence of the roughness geometry of tool surface and the flow stress of coated solid lubricants on tribo-conditions in cold forging

In cold die forging, a sever friction sliding is often locally caused on the tool surface. It is usually preferable to smoothly finish such a portion of the tool surface. Many studies have been performed to maintain good lubrication conditions by catching lubricants to micropockets of the tool surface. This research is aimed at the detailed FEM examination of how the tool surface roughness influences the friction coefficient, the local surface enlargement at the friction surface of material and solid lubricant thinning at the edge of tool–material interface.