In mechanical and electrical products, there are three major types of springs with the largest consumption
1. The spring of motor vehicle is mainly automobile;
2. Spring of electronic products based on daily electrical appliances;
3. The spring of optical device with camera, copier and camera as the main part
Motor vehicle springs are mainly developed in the direction of high strength to reduce mass; electronic springs are mainly developed in the direction of miniaturization; while optical springs are mainly developed in the direction of both high strength and small shape. The corresponding spring design methods, materials and processing technology have been developed