NUMERICAL ANALYSIS OF HOBBING IN UNFINISHED SPACE

抄録

The hobbing theory of generating the involute gear teeth has been often reported. However, a hobbing mechanism of enlarging the unfinished tooth space has been rarely investigated, because this mechanism is very complicated and the cutting behaviors are different with each tooth and even in the position on one tooth profile. In order to make clear the causes of the tooth wear and the hobbing vibration, it is necessary to know the cutting behaviors at any point on the edge. This paper describes a method of calculating the length and the thickness to be cut on each point closely divided along the tooth profile without neglecting the tip roundness. This method can be applied to any hobbing condition, e. g. to the cases of spur or helical gear, and the conventional or the climb hobbing. Some examples analyzed by this method are compared with the practical hobbing results, and then some suggestions for both wear and vibration analyses are given.