Characterization of the Friction Coefficient and White Layer at the Tool-Chip-Workpiece Interface Using Experimental and Numerical Studies during Friction Tests of AISI 1045

摘要

In this paper, a new experimental set-up able to simulate similar tribological phenomena as the ones occurring at the tool-chip-workpiece interface in metal cutting has been applied to the characterization of the tool-chip-workpiece interface during dry cutting of an AISI1045 with TiN coated carbide tools. Several friction tests have been made according to the sliding velocity. It has been shown that the apparent friction coefficient and the heat flux transmitted to the pin were strongly influenced by the sliding velocity. Metallographic studies of the machined sub-surface have been performed to understand the evolution of white layer formation. Tow phenomena have been observed: the first phenomenon is the plastic deformation from the low sliding velocity and the second phenomenon is obtained for the sliding velocity a bove of 60 m/min. White layer has been observed in this second regime. In additionally, the present paper employs the finite element method to extract local parameters around the spherical pin from experimental macroscopic measurements. A 3D ALE numerical model simulating the frictional test has been associated in order to determine the plastic strain and the contact temperature to better understand the tribological phenomena.