Planetary reducer is frequently used in mechanical equipment. Choosing a good material will improve the planetary reducer capacity and prolong the life.

Due to the structural and load characteristics, the planetary reducer should be used hardened gears. There are many heat treatment methods to obtain hardened gears. Such as surface quenching, overall quenching, carburizing quenching, nitriding, etc.

1. Surface quenching

   Common surface quenching methods include high frequency quenching (for small-size gears) and flame quenching (for large-size gears). The effect is best when the hardened layer of surface hardening includes the bottom of the tooth root. The tooth surface hardness can reach 45-55HRC.

2. Nitriding

   Nitriding can ensure that the gear can achieve high tooth surface hardness and wear resistance under the condition of minimum deformation. After heat treatment, the best finishing is no longer performed, which improves the load-bearing capacity.

3. Carburizing and quenching

   The carburized hardened gear has a relatively large load-bearing capacity, but the finishing process (tooth grinding) must be used to eliminate heat treatment deformation to ensure accuracy.

   Carburized hardened gears are commonly used alloy steels with a carbon fraction of 0.2%-0.3% before carburizing. The tooth surface hardness is often in the range of 58-62HRC. If it is lower than 57HRC, the hard surface strength will decrease significantly, and it will be brittle if it is higher than 62HR. Increase. The hardness of carburized hardened gears gradually decreases from the surface of the gear to the deep layer, and the effective carburizing depth is defined as the depth from the surface to the hardness of 5.25HRC.

   The effect of carburizing and quenching on the bending fatigue strength of gears not only increases the hardness of the core, but also lies in the residual compressive stress on the surface. It can reduce the stress in the maximum compressive stress area, so the root part of the tooth cannot be ground during tooth grinding.