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Several forging techniques for improving service performance of Datong spring

Release time:2021-04-10 16:56:43  Views: 767

With the increase of industrial products, Datong spring products have become more and more abundant, the amount of Datong spring has gradually increased, and the technology related to Datong spring has gradually matured. How to increase the performance is a problem faced by Datong spring manufacturers. Here are some common forging skills shared by Dongguan Datong spring factory

1、 Thermomechanical treatment: thermomechanical treatment is the combination of deformation strengthening and heat treatment strengthening of steel to further improve the strength and toughness of steel. Thermomechanical treatment can be divided into high temperature, medium temperature and low temperature. High temperature thermomechanical treatment is quenching immediately after deformation in stable austenite state, and can also be combined with forging or hot rolling, The strength and fatigue life of automobile leaf spring made of 60Si2Mn steel are greatly improved after high temperature thermomechanical treatment (930 ℃ + 18% thermal variable, oil quenching) and high temperature rapid tempering at 650 ℃ for 3.25min

2、 Austempering of Datong spring: for Datong spring with small diameter or enough hardenability, austempering can be used. It can not only reduce the center change, but also improve the strength and toughness. It is better to conduct another tempering after austempering to improve the elastic limit. The tempering temperature is the same as that of Austempering

3、 Shot Peening: shot peening is one of the most widely used methods to improve the surface quality of Datong spring. Datong spring requires high surface quality. Surface defects such as scratch, folding and oxidation decarburization often become the stress concentration place and fatigue fracture source of Datong spring when working. If the surface of Datong spring is shot peened with fine steel shot at high speed, shot peening can be carried out, It not only improves the surface quality and strength of Datong spring, but also makes the surface in the state of compressive stress, so as to improve the fatigue strength and service life of Datong spring

4、 Low temperature carbonitriding: for coil spring, tempering combined with low temperature carbonitriding (soft nitriding) can significantly improve the fatigue life and corrosion resistance of Datong spring

5、 Relaxation treatment of Datong spring: Datong spring works under the action of external force for a long time. Due to stress relaxation, it will produce a small amount of permanent (plastic) deformation. Especially for Datong spring working at high temperature, the phenomenon of stress relaxation is more serious at high temperature, which reduces the accuracy of Datong spring. This is not allowed for general precision Datong spring, This kind of Datong spring should be relaxed after quenching and tempering. Heat treatment process: the Datong spring is preloaded to make its deformation exceed the deformation that may occur when it works. Then it is heated under the condition of 20 ℃ higher than the working temperature and kept for 8 ~ 24h

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