Spiral tension spring: rolling, stress relief annealing, hook ring production, (tail cutting), stress relief annealing, standing treatment, inspection, surface anti-corrosion treatment, packaging.
Spiral torsion spring: rolling, stress relief annealing, torsion arm manufacturing, tail cutting, stress relief annealing, standing treatment, inspection, surface anti-corrosion treatment, packaging.
The manufacturing process of the spiral drawing and torsion spring described above is to process the hook ring or torsion arm at both ends after winding on the ordinary coil spring. In recent years, many domestic and foreign manufacturers have produced and used computer forming machine or special forming machine. The spring body and tail shape can be completed on the forming machine at one time, so the process of processing hook ring or torsion arm is omitted.
When using the materials that need quenching and tempering after forming, the main difference from the above process is quenching and tempering after forming, and sometimes the spring end processing needs normalizing treatment.
The process with brackets is not fixed, and whether it is carried out depends on the performance requirements of the spring.