With the progress of science and technology, the introduction of technology and the deepening of technological transformation, the processing technology of cylindrical gears has developed rapidly. The processing technology of gear mainly from gear hobbing shaving honing has gradually changed to gear hobbing grinding. Gear hobbing is one of the most widely used gear processing methods at home and abroad. Gear hobbing processing characteristics: the wide use of multi head hobs can greatly improve the gear processing efficiency; Using the hobbing technology of hard tooth surface, not only the machining accuracy is high, but also the fatigue strength of gear tooth surface can be improved; The gear hobbing machine adopts numerical control and digital display device, which can shorten the adjustment time of the machine tool and improve the machining accuracy; The use of superhard hob for dry gear hobbing without cutting fluid reduces the processing cost, improves the production efficiency and is environmentally friendly; Large gear hobbing. Due to the high efficiency and high precision of gear hobbing, the first step of gear processing is often completed by gear hobbing.
Firstly, the gear hobbing principle is introduced, and then the structural parameters of the hob are determined, including the selection of the basic worm of the hob and the selection of the gear hob. The installation requirements of the hob, the adjustment of the installation angle and the determination of the axial position of the hob are introduced. Secondly, the gear error is classified according to the main source of gear hobbing error and the gear rotation direction when the error occurs.
This paper introduces the gear hobbing principle, determines the structural parameters of the hob, including the selection of the basic worm of the hob and the selection principle of the gear hob, and introduces the installation requirements of the hob, the adjustment of the installation angle and the determination of the axial position of the hob. Because the basic involute worm has no tooth profile design error and high machining accuracy, it is more convenient to do the theoretical simulation research of gear hobbing process. Therefore, the hob selected in this subject is involute worm hob. Secondly, the gear error is classified according to the main source of gear hobbing error and the gear rotation direction when the error occurs.