Material and heat treatment process of elastic element of elastic sleeve pin coupling

The elastic sleeve elastic pin coupling is a nylon pin penetrated into the pin hole on the coupling flange, and it is matched with the half coupling to transmit torque.However, the pin hole needs to be quenched and tempered. Because the transmission time is too long, the pin hole will be enlarged and the tolerance will become larger, resulting in uneven force on the shaft hole of the coupling. Therefore, after the coupling is processed and formed The pin hole needs to be quenched and tempered and dipped in fire.Heating is one of the important processes of heat treatment.There are many heating methods for metal heat treatment,Charcoal and coal have long been used as heat sources, and then liquid and gas fuels have been used. The application of electricity makes heating easy to control, and there is no environmental pollution. These heat sources can be used for direct heating, or indirectly through molten salt or metal, and even floating particles. heating.

When the coupling pin hole is heated, the workpiece is exposed to the air, and oxidation and decarburization often occur (that is, the carbon content of the surface of the steel part is reduced), which has a very adverse effect on the surface performance of the parts after heat treatment.Therefore, metals should usually be heated in a controlled atmosphere or protective atmosphere, molten salt and vacuum, and can also be heated by coating or packaging methods.

The heating temperature is one of the important process parameters of the heat treatment process. The selection and control of the heating temperature is the main issue of the heat treatment quality.The heating temperature varies with the metal material being processed and the purpose of the heat treatment, but it is generally heated above the phase transition temperature to obtain a high-temperature structure.In addition, it takes time for the transformation. Therefore, when the surface of the metal workpiece reaches the required heating temperature, it must be maintained at this temperature to make the internal and external temperatures consistent, so that the microstructure changes. This period of time is called the holding time.When using density heating and surface heat treatment, the heating speed is extremely fast, and there is generally no holding time, while the holding time of chemical heat treatment is often longer.

The pin coupling is a kind of elastic coupling, which mainly relies on the backrest pin to wear the elastic rubber ring and transmit the torque by the elastic body.The quality of the elastomer material has a great influence on the transmission torque of the coupling and the service life of the coupling.Generally, the material of elastomer is divided into three types: polyurethane, poly-deer and black rubber. The most widely used material is polyurethane, and the color is pure yellow.Mainly considering the low cost, high temperature resistance and other advantages are widely loved by customers.The black rubber material is mainly used for low speed and large torque, and it is more suitable to use this elastomer in the case of low temperature resistance.