In mechanical and electrical products, the largest amount of spring three major categories:
1)the motor vehicles spring mainly used in car;
2)Electronic products spring mainly used in Household electrical appliances;
3)Optical device spring mainly used in Cameras, copiers and cameras
Motor vehicle spring 's develop tend to the direction of high-strength.,in order to reduce the quality. spring of electronic products primarily to small shape the direction of development;optical device spring mainly toward both high strength but also the small shaped the direction of development. Spring design methods, materials and processing technology have developed