ねじ状砥石による平歯車の全歯丈切込みの歯切り加工機構

抄録

The grinding positions of beginning and ending on the wheel surfaces when a involute spur gear is machined by the whole depth of cut with a rack-tooth worm wheel are geometrically and theoretically analyzed. The effects of operating parameters on the stock removal u per unit area at each part on the wheel surfaces are theoretically discussed. Moreover, it becomes clear that the wheel wear on the wheel surfaces depends on u. Other main results are summerized as follows : (1) As for u on the rack-tooth crest, it is becomes the maximum among the wheel surfaces and increases remarkably at the tip of trailing side on the crest. (2) On the rack-tooth surface, u is larger on trailing side than on leading side, small at the dedendum side on both tooth surfaces and becomes the maximum in the neighborhood of its pitch line. (3) Moreover, u increases when work feed speed is large and decreases when radius of generating rolling circle of worm wheel or number of teeth are large. (4) There is the appropriate work feed speed at which wheel wear on tooth crest becomes the minimum. This appropriate speed becomes higher accompanying the increase of number of teeth.