Spring does not reach the designated position and the cause of the failure and how to prevent

Spring does not reach the designated position and the cause of the failure and how to prevent in practice and test, the user and the spring manufacturers often unable to push the moving object to set the location of the spring, which means that the spring computing free length becomes shorter. The main reason is that no initial compression, namely make the spring compression to higher or higher level ( If you need) By the greater power and cannot recover after he was released. Free length operation. Shorten the amount referred to as the 'initial compression'. In the repeat 3 - 6 times after compression, no longer shorten the length, namely spring 'location'. After the initial compression spring permanent deformation. In practice, the compression spring should maintain its working length, even if it is beyond the elastic limit. Finished product, therefore, the calculation of spring should be equal to the length of the spring length and the initial amount of compression, it can avoid the spring does not reach the designated position, in order to avoid dangerous stress during spring coil tightly, resulting in abnormal spring show line and not in place. In the process of heat treatment, the finished spring must quenching and tempering. In particular, the workpiece must be placed inside the furnace, in order to prevent the spring shorten because of its own weight.
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