According to the control means spring forming process adopted can be divided into two kinds: hot and cold rolling method, of which processing line diameter larger than 8.0mm wire rod for forming by coil method, and the wire diameter is less than 8.0mm wire by cold roll forming method. Cold roll wire forming process is called cold forming processing, applied in the daily production is the spring general forming process, many hardware spring factory and workshop are using this method to complete the spring forming process.
  Over the years, our company has accumulated rich experience in the spring forming process, brought the gospel to many hardware and spring processing enterprises. For small diameter spring forming such as wire diameter less than 8.0mm below the spiral spring or spring steel strip, the heat treatment or cold variant machined after reinforcement, namely cold drawing of cold roll forming method. Because of cold drawn steel wire with high strength, using the cold drawing of cold roll forming method with the help of cold drawn steel wire deformation to complete the work hardening, and finally to complete this spring manufacturing process of cold forming. The cold spring steel wire according to self hardening process can be divided into the following three kinds of circumstances:
  First, patenting the cold drawing wire forming
  The cold drawing spring steel wire drawing three times, so that the total deformation reached about 50%, then through high temperature heating to Ac3 above the austenitizing temperature, then the isothermal treatment in lead bath 450-550 ℃, the austenite transforms to sorbite. The yield strength of spring wire reaches 1600Mpa, the cold roll forming, and to eliminate the stress by 200-300 ℃ annealing.
  Forming the second, oil tempered steel wire
  The first to reach the required size of wire drawing, oil quenching and tempering process, and then the. The spring steel wire is not as strong as patenting steel wire, but the performance is uniform, and the corresponding low cost. Use of cold roll forming, can be to stress treatment can be.
  Third, forming annealed wire
  The first wire drawing to the required size, and then annealing. The softening of tissue after cold roll forming the annealed wire, then after quenching and tempering treatment in to obtain mechanical properties required by the.
  Mechanical properties of spring in the molding processing to achieve the required are usually of the corresponding heat treatment. Among them, heat treatment is the metal material is placed in a certain medium to be heated, heat preservation and cooling treatment, by changing the metallographic structure of metal surface or internal, to a metal heat processing control and its performance. In recent years, many domestic and foreign manufacturers by computer spring machine or special forming machine to complete the spring forming, the spring body and tail structure in the CNC spring forming machine is a complete process, saves the processing of hook and loop or arm twisting process.
  Dongguan Kaichuang precision spring Machinery Co. Ltd.is a professional set spring machine manufacturers stand on one's own R & D and production of computer numerical control spring machine, has a history of ten years of development, a variety of computer spring machine cover industry line diameter between 0.15-8.0mm, with strong technical strength, its strong high-quality brand quality and perfect after sale service to win the favor and recognized by domestic and foreign customers of all. The relevant information from Kaichuang spring machine: http://www.kcmcnc.com/en.