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The reducer for the gear hardness requirements are very high, so the hardness of the gear is very important. There are many heat treatment methods for gear with hard tooth surface, which should be selected according to the characteristics of planetary gear reducer.
1. Surface quenching
The common surface quenching methods are high frequency quenching and flame quenching. High frequency quenching for small size gear, flame quenching for large size gear. When the surface quenching layer including the bottom of the tooth root, the effect is the best, the tooth surface hardness can reach 45~55HRC.
2, carburizing quenching
The gear with this quenching method has the relative best bearing capacity, and the gear with grinding is used to eliminate the deformation of heat treatment to ensure the accuracy of the gear. This makes a lot of sense in the field of speed reduction. Carburized quenching gear tooth surface hardness is usually in the range of 58~62HRC, lower than 57HRC tooth surface strength will be greatly reduced, higher than 62HRC gear brittle. From the tooth surface to the deep layer should be gradually reduced, and the effective carburizing depth for the surface to the deep layer should be gradually reduced, and the effective carburizing depth for the surface to the hardness of 52.5HRC depth. It is worth mentioning that the role of carburizing quenching in the gear tooth bending fatigue strength in addition to the increase of the hardness of the center, there is residual compressive stress on the surface of the gear after treatment, its role can reduce the stress in the maximum tensile stress zone of the gear tooth. In this way, when grinding teeth can not grind the root part, hobbing to use the amount of grinding hob.
3, nitriding
The gear with nitriding technology is not easy to deform, and can achieve high hardness and strong wear resistance. After heat treatment, no further finishing is required, which improves the carrying capacity. This is of special significance for the internal gears, which are not easily ground.
According to the different characteristics of the reducer, different heat treatment methods are selected. If you need reducer accessories, please feel free to contact us
