Table of Contents
Lubricants, Volume 5, Issue 1 (March 2017)
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Cover Story (view full-size image) In sheet metal forming, problems with lubricant film breakdown and galling are significant issues. [...] Read more. In sheet metal forming, problems with lubricant film breakdown and galling are significant issues. The present study elucidates the influence of trapped lubricant on a textured tool surface, which enables the substitution of hazardous lubricants by less harmful lubricants, thus preventing galling. The shallow, oblong pockets, perpendicular to the sliding direction with varying plateau width between them, were manufactured by milling of the hardened tools. The pockets were tested in a tribologically severe strip reduction test emulating the ironing of a deep drawn cup. By comparing measured drawing loads, an optimum tool texture was identified. Higher speeds and oil viscosity further enhanced the lubricant supply from the pockets. View the paper here.