Coiled spring is the abbreviation of spring coiling. Coiled spring is the first process of spring manufacturing, and it is also an important process. The precision of coiling plays an extremely important role in the entire manufacturing process. It basically determines the geometric size of the spring And characteristics and material utilization.

Spring rolling equipment is generally divided into spindle winding spring machine and spindleless spring winding machine

There are single rolling and multiple continuous rolling.

1. A single coil is generally used for springs and oil seal springs for strip manufacturing

2.Multiple continuous rolling is to roll into a series of coil springs at a time, and then cut into individual springs according to the size.

In order to obtain the required dimensional accuracy after cold forming, it is necessary to accurately grasp the springback of various springs of different materials when forming spring design, spring process device design and preparation of process regulations.

There are many factors that affect the amount of rebound, mainly the mechanical properties of the material, the winding ratio of the spring, and the process equipment.

The amount of rebound is directly proportional to the tensile strength fb of the material, and inversely proportional to the elastic modulus E. The larger the σ/E, the greater the amount of rebound. When the mechanical properties of the material are unstable, the amount of rebound is also unstable.

The larger the winding ratio and pitch of the spring, the smaller the plastic deformation, the more unstable the internal stress, and the more difficult it is to control the accuracy of the spring diameter and pitch. Therefore, when winding a spring with a larger winding ratio and pitch , Special attention should be paid to the operation of each process. For example, the speed should be slow when reversing, the coiled spring blank should be light when transporting, and the movement should be as little as possible before stress relief annealing. For spring blanks with a large winding ratio, it is best to roll After it is finished, it is fixed, and after the stress relief annealing is carried out at the same time with the mandrel, it is then removed from the mandrel.