What is the surface treatment function of torsion springs

What is the surface treatment function of torsion springs

What are the surface treatment effects of torsion springs:
(1) Protective atmosphere heat treatment. In my country, the heat treatment of torsion spring, oil quenched tempered steel wire and toughened steel with wire less than 15 mm adopts the heat treatment of protective atmosphere. Protective atmosphere heat treatment can eliminate surface decarburization and oxidation, and improve the surface quality of the material.
(2) Induction heating or protective atmosphere. This process is generally carried out on the wire before the helical torsion spring is formed. Some torsion spring factories combine the heat treatment of the wire with the production of the torsion spring to reduce costs. Induction heating treatment has a good strengthening effect, and the induction heating speed is fast, which helps to refine the crystal grains, reduce surface decarburization, and give full play to and improve the strength and toughness of the material.
(3) Surface nitriding heat treatment technology. In recent years, to achieve reliable fatigue life, high-stress valve torsion springs or other high-stress clutch torsion springs have also adopted surface nitriding technology. The current advanced technology is low-temperature gas nitriding technology, the general nitriding temperature is (450~470)℃, and the gas nitriding time is (5~20)h.

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