切りくずかみこみによるホブ切れ刃損傷と対策(機械要素,潤滑,工作,生産管理など)

抄録

The simulation program developed in the former report that calculates the clearance between cutting edge of hob and tooth flank of gear blank is applied to some practical industrial problems of dry hob cutting, i.e. chipping failure of cutting edge of carbide hob and bad coarse surface finish of hobbed tooth flank of product gears. The output of the simulation explains the mechanism of such actual failures in detail. The "Distance of Single Edge Cutting" of a hob tooth is proposed to be an index of pinching and crushing of chips intruded into the clearance between hob cutting edge and tooth flank of gear blank. Influencing factors on it is investigated and the bases for finding countermeasures are shown. This method has been applied to some practical cases of problem in mass-production of automotive gears, and good result was confirmed.