Valve springs are widely used. In electromechanical products, there are many types of springs. With the development of high-speed railways and the upgrading of vehicle shock absorption systems, the technology of hot-formed springs as vehicle suspensions has been greatly improved.

Automobile springs are mechanical parts that use elasticity to work. Generally made of automobile spring steel. It is used to control the movement of parts, alleviate impact or vibration, store energy, measure the size of force, etc. It is widely used in machines and meters. The types of automobile springs are complex and diverse. According to the shape, there are mainly spiral automobile springs, scroll automobile springs, and plate automobile springs.

If you compress a spiral rod instead of bending a straight rod, the energy stored in the metal car spring will be greater. According to the biography of Brunelleschi, he made a mouthful of alarm clocks, which used several generations of automobile springs. Someone pointed out that there was a picture of this alarm clock in a mechanical manual at the end of the 15th century with some peculiar spiral car spring clock pictures. This type of car spring is also used in modern mousetraps. Clocks with coil springs must have been in use around 1460, but they are basically royal luxury products. About a century later, clocks with car springs became a symbol of the middle class.

Large-scale springs and leaf springs, mainly railway rolling stock, trucks and construction machinery, and car seat springs, are mainly formed by hot-rolling, which is an important aspect of the spring manufacturing industry. This type of spring is mainly developed in the direction of high strength and high precision to stabilize product quality.