Effects of the Microsopic Roundness of the Cutting Edge on the Cutting Phenomena : 2nd Report, Stress Distribution on the Surface of a Cutting Edge

Abstract

In order to verify the existence of the burnishing action due to the microscopic roundness of the cutting edge as reported in the first report, we tried to find the stress distribution on the surface of the tool point. Preparing a cuting tool made of epoxy resin as photoelastic material, and cutting a lead pipe with it, we have made the stress distribution in the tool material clear by the photoelastic experiments. Namely, at the middle point of the roundness, the shearing stress changes its sign showing the existence of the burnishing action and the considerable normal stress concentration occurs.