【Summary Description】The selection of spring materials should be determined and priced based on the load nature, stress state, stress size, working temperature, environmental medium, service life, conductivity requirements, process performance, material source, etc. of the spring.
The selection of spring materials should be determined and priced based on the load nature, stress state, stress size, working temperature, environmental medium, service life, conductivity requirements, process performance, material source, etc. of the spring.
When determining the cross-sectional shape and size of materials, priority should be given to selecting series sizes specified in national and ministerial standards, and non-standard series materials should be avoided as much as possible.
Small and medium-sized springs, especially spiral tension springs, should prioritize the use of reinforced steel wire, lead bath isothermal cold drawn steel wire, and oil quenched tempered steel wire, which have high strength, good surface quality, and higher fatigue performance than ordinary quenched steel wire. Tempered steel wire, simple processing, good processability, and stable quality.
Carbon spring steel wire and piano wire generate significant residual stress after cold drawing. The residual stress after spring processing is large, and the size changes greatly after tempering, making it difficult to control the dimensional accuracy. After the oil quenched and tempered steel wire is drawn to the specified size, it is modulated and strengthened, and there is basically no residual stress. Strengthen the steel wire.
For large and medium-sized springs, cold drawn or cold drawn polished steel should be selected for those with high load accuracy and stress requirements. For springs with low load accuracy and stress, hot-rolled steel can be used.
Plate springs are generally made of 55Si2Mn and 60Si2MnA flat steel. 55SiMnVB, 55SiMnMoV. Grades such as 60CrMn and 60CrMnB.
The material cross-section of spiral springs should preferably be circular. Square and rectangular cross-section materials have strong load-bearing capacity and good impact resistance, which can miniaturize springs, but there are few sources of materials. Moreover, the price is relatively high, and unless there are special needs, it is generally recommended not to use this material. In recent years, the development of replacing trapezoidal steel wire with rolled flat steel wire has achieved good results.