Fundamental Research on Hobbing with Minimal Quantity Lubrication of Cutting Oil Influence of Hardness of Work Materials Under Several Cutting Conditions

Hironori Matsuoka; Takahiro Ryu; Takashi Nakae; Shuuichi Shutou; Tsukuru Kodera
This paper deals with the influence of hardness of work materials on flank wear, crater wear and finished surface roughness when using two types of high-speed steel (HSS) hob tool materials coated with (Al, Ti)N film. Specifically, hobbing with a minimal quantity lubrication (MQL) system is compared with dry hobbing. Experiments were conducted by simulating hobbing by fly tool cutting on a milling machine. The results are summarized as follows. (1) With SCM415 work material changed to hardness HB131, HB144 and HB161 by heat treatment, flank wear and crater wear of the tool are small when cutting comparatively hard HB161 work material, irrespective of the change in hob materials and cutting speeds. (2) With SCM435 work material changed to hardness HB172, HB195 and HB214, flank wear and crater wear tend to be small when cutting annealed HB172 work material. (3) When cutting SCM415 of hardness HB161 and SCM435 of hardness HB172, the finished surface roughness is small and the surface roughness of SCM415 is smaller than that of SCM435. (4) SCM415 of hardness HB161 is suitable for an MQL system in hobbing in terms of flank wear, crater wear and finished surface roughness.
Gear; Cutting; Gear; Hobbing; MQL; Work Material; Hardness; Fly Tool; Flank Wear; Crater Wear; Finished Surface Roughness
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