Abstract
This paper deals with the influence of hardness of work materials on behavior of crater wear mainly, flank wear and surface roughness, with various high-speed steel (HSS) hob materials coated with (Al,Ti)N in dry hobbing. Experiments were carried out using a fly tool. The results helped clarify the following points : (1) With chromium molybdenum steel SCM415 which was changed HB131, HB144 and HB161 in hardness, the crater wear decreases with increasing in hardness of work material, with using the three kinds of HSS hob materials, in which a powdered metal HSS SKH10 is effective for the crater wear. (2) With SCM435 which was changed HB172, HB195 and HB214 in hardness, the crater wear is smallest when SCM435 having HB172 was cut, and it was biggest when SCM435 having HB195 was cut. (3) The SCM415 having HB161 and SCM435 having HB172 are suitable irrespective of the change in the hob materials, in terms of the crater wear, the flank wear and the surface finished in dry hobbing.
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