Study on Scattering in Flank Wear of Cutting Tools (2nd Report) -Thermal Fatigue Deterioration of Wear Surface-

摘要

In this paper, a thermal fatigue experiment and a numerical analysis of thermal stress have been performed to investigate the cause of scattering in flank wear of carbide cutting tools. The results obtained are as follows : (1) Repeated temperature changes on the flank wear land, induced by tool vibration, make carbide tips uniformly deteriorate. (2) Worn tools increase not only the initial wear but also the rate of flank wear. (3) It is possible to identify the thermal fatigue effect on the scattering in the wear rate as the change of the parameter in the tool wear characteristic equation as proposed in the previous paper. (4) Repeated temperature changes give rise to a change of principal stress of 士100 MPa in the vicinity of the frank wear land. The thermal stress thus produced, which is around one-fifteenth of the tensile fracture strength of carbides, does not by itself cause the flank wear to be scattered.