Abstract
In this paper, wear mechanism model and shear plane formation model were built based on the influence of residual micro-void of powder metallurgy material on chip-tool interaction and serrated chip shear plane. In the wear mechanism model, the micro-void in the chip back surface tore and accumulated adhered workpiece material in sticking and sliding zones, respectively. In the occasional random shear model, the micro-void increased the change rate of the speed component near the micro-void to cause the shear plane shifts to the micro-void. Ti-6Al-4V powder metallurgy material was prepared with hot isostatic pressing technology to carry out machining experiment. The wear mechanism model and the occasional random shear model were verified with the research on micro-fluctuation of cutting force, wear morphology of cutting tool, and cross section of serrated chip.
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