Mb. De Rooij et Dj. Schipper, Analysis of material transfer from a soft workpiece to a hard tool: Part I- Lump growth model, J TRIBOL, 123(3), 2001, pp. 469-473
An important mechanism reducing the lifetime of the deepdrawing tools is ma
terial transferred from the workpiece to the tool, resulting in the buildup
of lumps on the tool surface. In this study a lump growth model, based on
transfer mechanisms observed in experiments, is developed. The development
of the summit height distribution of the tool surface is calculated from th
e growth behavior of the individual lumps. Important parameters influencing
material transfer are determined from the calculated summit height distrib
utions. It follows that lump growth can be decreased and, under certain con
ditions prevented, by a higher (surface) hardness of the workpiece. a lower
roughness of the tool surface, a lower nominal contact pressure, and a low
er shear strength of the interface. These results are in general agreement
with results obtained from experiments. Experimental results are presented
in an accompanying paper (de Rooij and Schipper, 2000).