According to the nature of the force, the custom torsion spring can be divided into precision spring, stretch spring, compression spring, torsion spring, bending spring, spiral spring, spring deformation under the action of external force, remove the external force, the spring will be able to restore the state.

Many tools and equipment use the property of precision springs for complex functions. For example, in many buildings, the door hinges are fitted with a return spring that automatically resets when people come in and out. People also make use of this function into automatic umbrella, automatic pencil and other supplies, very convenient. In addition, a variety of buttons and keys are also necessary to reset the spring.

The reset function of the torsion spring manufacturer is the essential reason for the spring to have elastic potential energy. Spring force after the elastic deformation, because of the spring reset function, the spring has elastic potential energy. But if the force is too large, beyond the maximum elastic limit, then the spring's reset function does not exist, and there is no elastic potential energy.

The torsion spring deforms under the action of external force. After the removal of external force, the spring can be restored to its state. A lot of tools and devices use the property of springs for complex functions. For example, in many buildings, the door hinges are fitted with a return spring that automatically resets when people come in and out. People also make use of this function into automatic umbrella, automatic pencil and other supplies, very convenient. In addition, a variety of buttons and keys are also necessary to reset the spring. Elastic deformation is easy to reset, but plastic deformation cannot reset.

The return function of spring is mainly derived from the elastic limit of spring material. The deformation within the elastic limit is elastic deformation, while the deformation outside the elastic limit becomes plastic deformation.