How to improve the service life of precision springs.sewing thimble Production

　　At present, precision springs are more and more widely used, the quality of each manufacturer is also different, and the service life of each precision spring is also different. So how to improve the service life of precision springs? The following methods can be used.

　　Isothermal quenching of springs: For springs with small diameters or sufficient hardenability, isothermal quenching can be used, which can not only reduce the change of heart, but also improve the strength and toughness. After isothermal quenching, it is best to perform another tempering, which can increase the elastic limit, and the tempering temperature is the same as the isothermal quenching temperature.

　　Spring relaxation treatment: The spring works under the action of external force for a long time. Due to stress relaxation, a small amount of (plastic) deformation will occur. Especially for springs working at high temperature, the stress relaxation phenomenon is more serious at high temperature, which reduces the accuracy of the spring. This is not allowed for general precision springs. Therefore, such springs should be relaxed after quenching and tempering. Heat treatment process: preload the spring so that its deformation exceeds the deformation that may occur when the spring is working. Then heat at 20°C higher than the working temperature for 8~24h.

　　Deformation heat treatment: Deformation heat treatment combines the deformation strengthening and heat treatment strengthening of the steel to further improve the strength and toughness of the steel. Deformation heat treatment is divided into high temperature, medium and low temperature. High temperature deformation heat treatment is to quench immediately after deformation in a stable austenite state, and it can also be combined with forging or hot rolling, that is, quenching immediately after hot forming. The automobile leaf spring made of 60Si2Mn steel is subjected to high temperature deformation heat treatment (930 ° C + thermal variable 18%, oil quenching), and then adopts high temperature rapid tempering at 650 ° C × 3.25min, and its strength and fatigue life are greatly improved.

　　Shot peening: Shot peening is one of the most widely used methods to improve the surface quality of springs. Springs require high surface quality, and surface defects such as scratches, folds, and oxidative decarburization tend to become stress concentrations and fatigue fracture sources during spring operation. If the surface of the spring is blasted with small steel shot at high speed and shot peened, it will not only improve the surface quality of the spring, but also improve the surface strength, so that the surface is in a state of compressive stress, thereby improving the fatigue strength and service life of the spring.

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