It is the newest method of gear finishing. It is cold working process accomplished by rolling the gear in contact and under pressure with three hardened burnishing gears. In this case, a cutter harder than the work and in the form of conjugate gear which meshes with it in such a way that when rotated together, relative sliding between the cutter and the work teeth obtained, is used. The teeth of the cutter are serrated normal to the tooth profiles and in operation, the cutter and work are meshed together as helical gears with the planes of their respective axes crossing. In action one member of the pair is driven and makes the other rotate, the new parallelism of the axes causes sliding action between the teeth. The value of the crossed axis angle controls the finish produced to some extent since smaller the angle, finer the finish. Angles ranging between 8o to 45o are generally found most satisfactory.
Shaving improves gear tooth finish where the cutting process has not provided the required standard, ex that with high-speed hobbing but the cut gear must have small errors only in pitch, profile and concentricity. The process is ideal for automative gearbox gears after hobbing and before hardening. The disadvantage of this process is that the surface of tooth is covered with amorphous or smear metal rather than metal having true crystalline structure.
Shaving improves gear tooth finish where the cutting process has not provided the required standard, ex that with high-speed hobbing but the cut gear must have small errors only in pitch, profile and concentricity. The process is ideal for automative gearbox gears after hobbing and before hardening. The disadvantage of this process is that the surface of tooth is covered with amorphous or smear metal rather than metal having true crystalline structure.
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