Choosing a good planetary reducer material will help improve the bearing capacity and service life of the gear reducer.
Aiming at the structural characteristics of precision reducers and the load characteristics of gears, hard toothed surface gears should be widely used. There are many methods for obtaining heat treatment of hard toothed gears. Such as surface hardening, overall hardening, carburizing hardening, nitriding, etc., should be selected according to the characteristics of the gear reducer.
Gear reducer
Surface hardening
Common surface hardening methods include high frequency hardening (for small size gears) and flame hardening (for large size gears). The surface hardened layer works best when it includes the bottom of the tooth root. Tooth surface hardness can reach 45-55HRC.
2.Nitriding
The use of nitriding can ensure that the gear achieves high tooth surface hardness and wear resistance under the conditions of minimal deformation. The best finishing is no longer performed after heat treatment, which improves the bearing capacity.
3.Carburizing and quenching
Carburizing and quenching gears have a relatively large load-bearing capacity, but the finishing process (grinding) must be used to eliminate heat treatment deformation to ensure accuracy.
Carburizing and quenching gears commonly use alloy steel with a carbon fraction of 0.2% -0.3% before carburizing. The tooth surface hardness is usually in the range of 58-62HRC. If it is lower than 57HRC, the hardness of the hard surface is significantly reduced. increase. The hardness of carburized hardened gears gradually decreases from the gear surface to the deep layer, and the effective carburizing depth is specified as the depth from the surface to a hardness of 5.25 HRC.
The role of carburizing and quenching in the bending fatigue strength of gears is not only to increase the core hardness, but also to the residual compressive stress on the surface. It can reduce the stress in the area of maximum compressive stress, so the tooth root cannot be ground when grinding
