Coil spring pogopin production process

　　The coil spring is the first and most important process in spring manufacturing. The precision of coiling plays an extremely important role in the entire manufacturing process, which basically determines the geometric size and characteristics of the spring and the utilization rate of materials.

　　The spring rolling equipment is generally divided into a mandrel rolling spring machine and a mandrelless spring rolling machine.

　　Rolling methods include single rolling and multiple continuous rolling. A single coil is generally used for springs made of strip materials and oil seal springs, etc.; multiple continuous coils are rolled into a series of coil springs at one time, and then cut into individual springs according to 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 during forming during spring design, spring process device design and process specification. There are many factors affecting the springback, mainly including the mechanical properties of the material, the winding ratio of the spring and the process device.

　　The amount of springback is proportional to the tensile strength fb of the material and inversely proportional to the elastic modulus E. The greater the σ/E, the greater the amount of springback. When the mechanical properties of the material are unstable, the springback is also unstable. stainless steel spring

　　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 precision of the spring diameter and pitch. Therefore, when rolling a spring with a large winding ratio and pitch, special attention should be paid to the operation of each process. For example, slow down when reversing, light when handling coiled spring blanks, move as little as possible before stress relief annealing, etc. For the spring blank with a large winding ratio, it is best to fix it after rolling, and then remove it from the mandrel after stress-relieving annealing at the same time with the mandrel.

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