The selection of hollow rotary platform reducer material is beneficial to improve the bearing capacity and service life of gear reducer. In view of the structural characteristics and load properties of gear, hard face gear should be widely used. There are many ways to heat gears to obtain hard tooth surfaces. Such as surface quenching, overall quenching, carburizing quenching, nitriding, etc., should be selected according to the characteristics of gear reducer, the following sanhua with you to understand the quenching process of hollow rotary platform reducer:

1. The nitriding

The adoption of nitriding can ensure the gear in the condition of minimum deformation, high hardness and wear resistance of tooth surface, no finishing after heat treatment, improve the bearing capacity.
       2. Surface quenching
       The common surface quenching methods are high-frequency quenching (for small size gear) and flame quenching (for large size gear). When the surface hardening layer includes the bottom of the root, the effect is obvious. Tooth surface hardness up to 45-55HRC.
       3. Carburizing and quenching
       Carburized and hardened gears have relatively large bearing capacity, but a finishing process (gear grinding) must be used to eliminate heat treatment deformation to ensure accuracy.
Alloy steel with 0.2%-0.3% carbon fraction before carburizing and hardening gear is commonly used. The hardness of tooth surface is usually in the range of 58-62hrC. When it is lower than 57HRC, the strength of hard surface decreases significantly, and when it is higher than 62HRC, the brittleness increases. The hardness of the carburized gear decreases gradually from the surface to the deep layer of the gear, 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 is not only to increase the hardness of the core, but also to increase the residual compressive stress on the surface. It can reduce the stress in the stress area, so the root part can not be ground when grinding teeth.