The Effect Of Strong Pressure On Springs

The deformation of a spring is when the external force exceeds the elastic limit of the spring, and the rebound height is lower than the original height or exceeds 0.6 mm. After the spring deforms, the elastic force and stiffness will also change. Therefore, in order to obtain a suitable spring, sometimes the spring is made higher in the design drawings and subjected to strong compression treatment after production to deform and change the spring. Spring specifications that meet the requirements.
However, there are conditions for improving the bearing capacity of springs through strong compression (tension, torsion) treatment. Due to the strong compression process, only when the surface material of the spring generates beneficial residual stress and strong working pressure will affect compression, and only during strong compression (tension, torsion), the residual stress generated by the spring material and the material with large plastic deformation increase the elastic limit of the spring. However, there is a certain limit to the elastic limit of each material. Once this limit is exceeded, the material will not only undergo plastic deformation, but also undergo "complete yielding" deformation. Many hot springs are strongly compressed by 0.5 under 'complete' conditions σ B (Pull) material. The "yield" is deformed.
The yield limit of different materials also varies. The yield limit value can only be determined after strength calculation and testing. In addition, the effect of strong pressure (tension, torsion) treatment is closely related to the shape and structure of the spring, as well as the process method of strong pressure treatment. In terms of the shape of the spring, it is impossible to improve its load-bearing capacity through strong compression with a large helix ratio or a small helix lift angle. To achieve the maximum spiral ratio and spiral lift angle, it is necessary to design strong pressure. The experiment can be determined. Therefore, it is not just about simply pressing the spring, pulling it, pulling it or twisting it, it can increase the load capacity at once.
Except for high stress springs, general compression, tension, and torsion springs do not have the necessary conditions for strong compression (tension, torsion), but the conditions can be achieved through the "pre high" process of springs. Taking compression springs and torsion springs as examples, by maintaining strong pressure on the "pre height" and "pre angle" of the spring, two goals can be achieved: first, to achieve "compression", "compression", and torsion of the spring; The second is that the height or angle of the spring after strong pressure treatment just meets the design requirements.