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Surface treatment technology of planetary gear reducer
Sep 10, 2018

The choice of planetary gear reducer material is conducive to improving its bearing capacity and service life.

In view of the structural characteristics of the Starred-River reducer and the load characteristics of the gears, hard tooth face gears should be widely used. There are many ways to obtain hardened gear heat treatment. Such as surface quenching, integral quenching, carburizing quenching, nitriding, etc., should be selected according to the characteristics of gear reducer.


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1. Surface quenching

The common surface quenching methods are high frequency quenching (for small gears) and flame quenching (for large gears). The hardened layer with surface hardening includes the bottom of the tooth root, and the effect is good. The hardness of the tooth surface can reach 45-55HRC.


2. Nitriding

Nitriding can ensure that the gear has high hardness and wear resistance under the condition of small deformation, and no good finishing is carried out after heat treatment, thus improving the bearing capacity.


3. Carburizing and quenching

Carburized and quenched gears have relatively large bearing capacity, but must be used to eliminate the heat treatment deformation by finishing process (grinding teeth) to ensure accuracy.

The hardness of the alloy steel whose carbon content is 0.2% - 0.3% before carburizing is usually in the range of 58-62 HRC. If the hardness is lower than 57 HRC, the hardness of the alloy steel decreases significantly and the brittleness increases when the hardness is higher than 62 HRC. The hardness of carburized and quenched gears decreases gradually from the surface to the deep layer, and the effective carburized depth is defined as the depth from the surface to the hardness of 5.25 HRC.


The effect of carburizing and quenching on the bending fatigue strength of gears lies not only in the hardness of the center but also in the residual compressive stress on the surface. It can reduce the stress in the large compressive stress zone, so the tooth root part can not be worn when grinding.

 *For more detailed parameters,size,price.Pls contact the Hangzhou Starred-River Machinery Co., Ltd.

Tel:+86-571-89988766

E-mail:802@china-sr.com

Website:http://www.srgearboxes.com

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