Gear hobbing is the principle of generative method to process gears. Using a hob to process a pair of wheels is equivalent to a pair of staggered helical wheel meshing. Hobbing gears belong to the generation method, which can be regarded as gear and rack transmission without meshing clearance. When the hobbing gear rotates once, it is equivalent to the rack moving one tooth in the normal direction, and the continuous transmission of the hob is like an infinitely long rack moving continuously. When the hob and the hobbing blank are in strict accordance with the transmission ratio of the gear to the rack, the envelope of the hob teeth at a series of positions forms the involute tooth shape of the workpiece. With the vertical feed of the hob, the desired involute profile can be hobbed.
Gear hobbing is a processing method of gear processing, that is, gear hobbing machine is used to process gears.
In addition, there is gear shaping, that is, gear shaping.