Abstract
This paper deals with the influence of hardness of work materials on flank wear and crater wear, when using two types of high-speed steel (HSS) hob materials coated with (Al, Ti) N film with minimal quantity lubrication (MQL) system in hobbing. Experiments were conducted by simulating hobbing by fly tool cutting on a milling machine. The results obtained are summarized as follows. (1) With SCM415 work material which was changed HB131, HB144 and HB161 in hardness, the flank wear and the crater wear are small when cutting work material having comparatively hard HB161 which was rolled irrespective of the change in hob materials and cutting speeds. (2) When using SCM435 work material which was changed HB172, HB195 and HB214 in hardness, the flank wear and the crater wear tend to be small when work material having HB172, which was annealed, was cut. (3) SCM415 having HB161 is suitable for MQL system in hobbing in terms of flank wear and crater wear.
