In recent years, with the rapid development of China's manufacturing industry, the demand for industrial products to mold is increasing, mold industry has also made great progress. In stamping die, plastic die, widely used in a large number of elastic components, especially shaped section of steel wire cylindrical spiral compression spring as pushing, unloading, jacking, reset and so on. But in use, due to the early failure of the die spring, not only increase the mold maintenance cost, but also affect the normal production. In addition to the quality problems in spring production, there are also many problems in mold design, assembly and use, which should arouse our great attention.

The torsional spring is a mechanical force storage structure, mainly used in ancient crossbows and other crossbow type long-range weapons. The torsion spring accumulates the force by twisting or rotating the elastic material which is soft and tough, and releases the force by using the lever principle, so that the projectile has certain mechanical energy. Its action: modern torsional spring torsional lever is made of steel with good elasticity more often than not, the form also has a great change, there are hairspring in mechanical interior and exterior, there are power springs in toy gyro gun, there are also torsion bar in tank and car. The torque rod is small in size and large in torque, which makes it an excellent shock absorber for transportation.