I believe everyone knows that springs can be customized with different materials, but you also know what effect different materials have on the spring. The choice of spring materials should be based on the nature of the spring's load, stress state, stress level, operating temperature, environment. The medium, service life, requirements for conductive magnetic permeability, process performance, material source and price are determined.
When determining the cross-sectional shape and size of materials, the series sizes specified by national standards and ministerial standards should be selected first, and materials with non-standard series specifications should be avoided as much as possible. Medium and small springs, especially helical tension springs, should preferably be strengthened steel wires, lead drawn isothermal cold drawn steel wires and oil-quenched and tempered steel wires. They have higher strength and good surface quality, and their fatigue performance is higher than ordinary quenching. Tempered wire, simple processing, good workmanship and stable quality.
Carbon spring steel wire and piano wire have large residual stress after cold drawing. After processing the spring, there is a large residual stress. After tempering, the dimensional change is large, and it is difficult to control the dimensional accuracy. Oil quenched and tempered steel wire is modulated and strengthened after the steel wire is drawn to a specified size. There is basically no residual stress. After the spring is tempered at low temperature, the dimensional change is small and the heat resistance is better than cold drawn. Reinforced steel wire.
For large and medium springs, for high load accuracy and stress, cold drawn materials or polished steel after cold drawing should be used. For springs with low load accuracy and stress, hot-rolled steel can be used. Leaf springs generally use 55Si2Mn, 60Si2MnA, 55SiMnVB, 55SiMnMoV, 60CrMn, 60CrMnB and other grades of flat steel.
The material section of the coil spring should preferably be a circular section. Square and rectangular cross-section materials have strong bearing capacity and good impact resistance. They can also miniaturize springs, but they have less material sources. And the price is high, except for special needs, generally do not choose this material. In recent years, the development of flattened round steel wire instead of trapezoidal steel wire has been developed with good results.