Heat treatment and strengthening technology of Belleville spring
1) Heat treatment in protective atmosphere. In China, the heat treatment of spring, oil quenched and tempered steel wire and toughened steel wire with wire less than 15mm are all carried out in protective atmosphere. The surface decarburization and oxidation can be eliminated and the surface quality of materials can be improved by heat treatment in protective atmosphere.
2) Induction heating or protective atmosphere induction heating heat treatment. This process is usually carried out on the wire before the coil spring is formed. Some spring factories put the heat treatment of wire material together with the production of spring to reduce the cost. Induction heating treatment has a good strengthening effect, and the speed of induction heating is fast. It is helpful to refine grains and reduce surface decarburization. It can give full play to and improve the strength and toughness of materials. Extension spring
3) Surface nitriding heat treatment technology. In recent years, in order to achieve reliable fatigue life, high stress valve butterfly spring or other high stress clutch spring also adopts surface nitriding technology. Now, the relatively advanced technology is low temperature gas nitriding technology. Generally, the nitriding temperature is (450-470) ℃, and the gas nitriding time is (5-20) H.
