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Experimental Investigation on the Effect of Workpiece Hardness and Cutting Speed on Surface Roughness in Hard Turning With CBN Tools

Hard turning is considered as a new machining process aimed at turning hardened steels with high surface qualities. This process is a good alternative for many grinding applications which were previously done through traditional machining processes. The goal of this paper is to test the empirical feasibility of using this new method instead of grinding in many industrial applications, and to determine the effects of independent parameters such as hardness of parts and cutting speeds on the surface quality and tool wear in hard turning operations. Hence parts made of AISI 4140 alloyed steel are exposed to different thermal treatments to achieve different hardness rates in the range of hard turning operations. These parts are then machined with CBN cutting tools and CNC lathing machines at different cutting speeds, and results are compared in terms of surface roughness.