Based on the generating principle,the conjugate curves of processed gear,cut by the different tool edges of Ⅰprotuberance type pre-grinding hob,were derived in terms of coordinate conversion.

Profile Machining of Gear Hob and Worm Hob;

The Influence of Design of Hob Cutter Tip on Teeth Bending Strength;

Screw Rotor Hob Accuracy Design;

Caculation of principle error of involute profile processed by Archimedean hobbing cutter;

The equation of single hobbing cutter's locomotion locus and the mathematical model of its instantaneous cutting area are established.

This paper analyses the source of the hobbing gear error and provides the revised quantity of the hobbing cutter for the medium_hard gear according to calculation result and materials concerned.

The structure and material of rolling cutter, the corresponding heat treatment, the edge grinding technology and the machine structure have been improved and renovated.

The new rolling cutter for the recoiling vest-like plastic bag manufacturing device is developed, the structure, material, heat treatment process and edge grinding techniques are improved.

According to the literature about the manufacture models of three kinds,radial feed-rolling cutter,broach and Gleason cutter,the effect of centre point-centre line method,centre deviation method and oblique feed on qualified gear length were inspected.

It raises holbing effidency and tool ide by 100% than that of ordinary hobs.

Based on the research on the meshing between hobs and gears the optimum proflie design method of the pre-gringding hob is given,and the optimum profile of the pre-gringding hob used to cut the quasi high-speed locomotive traction gear has been designed according to the application of the traction and their proceeding technolog.