Gear reducer heat treatment

High-quality gear reducer materials can reasonably increase the service life of the planetary reducer. For the structural characteristics of the precision reducer and the load characteristics of the gears, hard journal gears should be generally selected. There are many heat treatment methods for obtaining hard journal gears, such as surface quenching, overall quenching, carburizing quenching, high-frequency quenching, etc., which should be selected according to the characteristics of the gear reducer.

1. Surface quenching The common surface quenching methods include high-frequency quenching (for small-sized gears) and flame quenching (for large-capacity gears). The case-hardened hardened layer NMRV-NMRV actually works very well when it includes the bottom end of the gear teeth. The journal hardness reaches 45-55HRC.

2. High-frequency quenching The use of high-frequency quenching can ensure that the gears can achieve high journal hardness and wear resistance under the standard of small deformation. After the heat treatment process, very good deep processing is not carried out, and the bearing capacity is improved.

3. Carburizing and quenching Carburizing and quenching gears have a relatively large bearing capacity, but the deep processing process (gear grinding) must be used to reduce the deformation of the heat treatment process to ensure precision. Carburizing and quenching gears are usually made of carbon steel with NMRV-VS a carbon content of 0.2%-0.3% before carburizing, and the journal hardness is often in the range of 58-62HRC. The ductility is improved. The hardness of carburized and quenched gears gradually decreases from the surface of the gear to the deep layer, and a reasonable deep layer of carburizing is required to be from the surface to the deep layer where the hardness is 5.25HRC. The effect of carburizing and quenching on the gear bending fatigue limit level not only gradually increases the core hardness, but also depends on the residual compressive stress on the surface. It can reduce the in-situ stress in the very high compressive stress area, so it is not possible to grind the tooth root when grinding the tooth.