Spring is widely used in mechanical and electrical products, spring type and variety, with the rapid development of high-speed railway, vehicle damping system upgrade, as hot spring forming technology of vehicle suspensionhas greatly improved.

Spring is a kind of flexibility to work in the use of mechanical parts. General automobile spring steel. To control the mechanical movement, easing impact or vibration, energy storage, the size of the measuring force, widely used in machinery, instrument. Types of automobile spring is complicated, according to the shape, the main spiral spring, scroll spring in automobile, automobile spring