Development of a friction model for the tool-chip-workpiece interfaces during dry machining of AISI4142 steel with TiN coated carbide cutting tools

Abstract

This work deals with the identification of a new friction model for high speed dry cutting of AISI4142 steel with TiN coated carbide tools. Both experimental and numerical studies were used to find the relationship between friction coefficient, sliding velocity, contact pressure and contact temperature. A tribometer, based on a plane-sphere contact configuration, has been developed to reach extreme contact conditions similar to the ones occurring during metal cutting. The apparent friction coefficient, provided by the ratio between the tangential and normal forces, is measured. It is assumed that this coefficient can be divided into two components: an adhesive coefficient and a plastic deformation coefficient. The proportion of each component is investigated by means of a numerical model simulating the friction of a sphere with similar contact conditions.