Views: 0 Author: WeiGao Transmission Publish Time: 2021-10-26 Origin: WeiGao Transmission
Reducer can be seen in many machines. A good reducer can improve the service life and bearing capacity of the body. According to the structural characteristics of precision reducer and the load properties of gear, hard gear should be widely used. There are many heat treatment methods to obtain hardened gears. Such as surface quenching, integral quenching, carburizing quenching, nitriding, etc., shall be selected according to the characteristics of gear reducer. Precision planetary reducer is composed of three transmission structures: planetary gear, sun gear and inner gear ring. The correct heat dissipation method helps to improve the working efficiency of the equipment. The correct way of heat dissipation helps to improve the working efficiency of the equipment. There are three ways of heat dissipation.
1. Surface quenching
There are two common surface quenching methods: high frequency quenching (for small size gears) and flame quenching (for large size gears). When the hardened layer of surface quenching includes the bottom of the tooth root, the effect is good. The tooth surface hardness can reach 45-55hrc
The use of nitriding can ensure that the gear can achieve high tooth surface hardness and wear resistance under the condition of small deformation. After heat treatment, good finish machining is no longer carried out, and the bearing capacity is improved.
3. Carburizing and quenching
Carburized and quenched gears have relatively large bearing capacity, but finishing process (gear grinding) must be used to eliminate heat treatment deformation to ensure accuracy. Carburized and quenched gears are usually made of alloy steel with carbon content of 0.2% - 0.3% before carburization. The hardness of tooth surface is often in the range of 58-62hrc. If it is lower than 57hrc, the hard surface strength decreases significantly, and if it is higher than 62hr, the brittleness increases. The hardness of the carburized and quenched gear gradually decreases from the gear surface to the deep layer, and the effective carburizing depth is specified 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 improves the hardness of the core, but also lies in the residual compressive stress on the surface. It can reduce the stress in the high compressive stress area, so the tooth root cannot be ground during tooth grinding.
1. Natural cooling
When the general box cannot meet the heat dissipation requirements, heat dissipation fins can be added outside the box, and the setting of heat dissipation fins shall enable the air to circulate naturally.
2. Fan cooling
If the natural cooling of the planetary reducer box alone cannot meet the requirements, the fan can be used for cooling.
3. Water cooling
The oil pool of the precision planetary reducer is equipped with a serpentine water pipe. The serpentine water pipe is generally made of red copper or brass. The pipe is filled with cooling water, which takes away part of the air heat of the lubricating oil.