1. Gear hobbing
Gear hobbing belongs to the generative method, which can be regarded as sprocket rack transmission without meshing clearance. The gear hobbing rotates once, which is equivalent to the rack moving one tooth in the normal direction. The continuous transmission of the hob is like an infinitely long rack in continuous motion. When the hob and the hobbing blank are in meshing transmission strictly according to the gear and rack transmission ratio, the involute tooth profile of the workpiece is formed by the envelope of the hobbing cutter teeth at a series of positions. With the vertical feed of the hob, the required sprocket tooth profile can be cut by rolling. Gear hobbing is a widely used method of gear cutting. It can process involute gears, arc gears, cycloidal gears, sprockets, ratchets, worm gears, and envelope worms. The accuracy can generally reach DIN4~7. The current advanced technology of gear hobbing includes.
(A) Hobbing with a multi-head hob.
(B) Hard tooth surface hobbing technology.
(C) Gear hobbing technology.
High-speed gear hobbing technology.
2. Shaping
Gear shaping is particularly suitable for processing inner sprockets and multiple gears. After using special tools and accessories, it can also process silent sprockets, ratchets, internal and external splines, toothed belt wheels, sector gears, incomplete gears, special gear couplings, racks, face gears, bevel gears, etc. The current advanced gear shaper technology includes.
(A) Multi-tool head shaping technology.
(B) Microcomputer CNC gear shaper.
(c) Hardened gear slotting technology.