Cutting Forces and Surface Quality in Precision Milling of Hardened Steel with Cubic Boron Nitride Cutting Tools

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Hadi Sutanto

Abstract

Understanding the effects of cutting parameters on cutting forces and surface quality is very important for the evaluation of the machined surface. This paper presents an experimental study of cutting forces and surface quality in precision milling of hardened steel (60 HRC) using cubic boron nitride (CBN) cutting tools. The observations are mainly concentrated on the effect of cutting speed and feed rate with constant depth of cut. The results show that the surface finish produced by CBN cutting tools were affected by cutting parameters and compatible with the results of grinding process. The changes of micro-hardness in the sub-surface of milled surface show gradual profiles which mean higher fatigue strength in the performance of the parts. In general, the results of measurement of residual stresses near the machined surface of hardened steel are compressive stress. Based on these results it can be concluded that precision milling of hardened steel is a suitable grinding process.

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Research Articles