We have encountered in daily life, after the spring application before long its telescopic working capacity, even there is no elasticity, this is because in the application of the compression exceeds the larger, if the pressure is large to cause the spring fracture, the average number of times in use should not be too much, and should be in the spring acceptable pressure range of application. Also with and without preloading applications, it is said that some people in the whole process of application of spring with gap leads to spring up and down or so vibration causing the spring produced distortion, if there were the preloading, the application of the spring is relatively stable, stainless steel spring is usually not exhaust type can be used, it will lead to wear spring pin and spring, spring causes even fracture.

1. The key factor to harm the spring force is the raw material. The higher the yield of raw material, the higher the fatigue strength of spring. Therefore, in order to ensure the fatigue strength of the spring, the spring material should be studied first.

2, spring surface quality has a great harm to the spring fatigue strength. The cracks and scars caused by spring raw materials in the whole process of manufacturing are often the direct cause of spring fatigue.

3. The next one is the size of the spring. The larger the specification of the raw material, the more defects it will cause. Therefore, the spring manufacturers point out that special attention must be paid to the spring manufacturing specifications when calculating the fatigue strength of the spring.

4, the application of spring and storage of natural environment.