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The different types and designs of the springs will of course have different spring tolerances. There are a large number of different types of springs, for example gas springs and tension springs.
Today the accuracy of the tools and there positions are high and therefore depends the geometric spring tolerances most evenness of the spring material. The material properties can also vary to a greater or lesser extent between material heats and material manufacturing batches. The consequence is that spring tolerances below the capability of the material and process lead to extra costs for you.
The best is to use a spring supplier that follow the material and process capability regularly with statistical methods. The supplier shall also provide knowledge and information about type of distributions, probabilities, Cpk values and other statistics for the factors/measurements in spring specifications.
Most types of springs are manufactured by plastic deformation of the spring material. This could possibly be compared with forging, but definitely not with machining. During plastic forming, the material springs back to a certain extent and residual stresses are created.
The plastic deformation and the spring back depends both of the accuracy of the tools and there positions and the elastic and plastic properties of the material. For spring tolerances, you should comply with the DIN standard for springs since this is the standard that best reflects real life conditions.
Article Source: http://www.svenska-artiklar.se
Lesjöfors is an international full-range supplier of standard springs and bespoked springs, wire forms and strip components. Lesjöfors was established in 1675. Spring manufacture started in 1852. These days, Lesjöfors is one of Europe's leading manufacturer of spring products.
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