Spring temper matters needing attention

1, not to raise the temperature to shorten time to temper the spring. 2, hardness: with the increase of tempering temperature, the hardness after rising slightly dropped. Fatigue performance of the best slightly below the hardness of the maximum temperature. 3, reducing: carbon steel spring temper diameter will shrink, so should set aside some sizes in the coil spring. 4, spring heat tint: heat tint is related to temperature and residue on the surface of the steel wire, color uneven temperature distribution and the airflow or the chamber of a stove or furnace, if you expect even color, to manage the furnace and the loading way; If you have any oil or partial fingerprints, will change color after tempering. 5, tempering temperature: generally USES the tempering temperature - in 250 200-280 ℃, if adopted 250 ℃ processing wire, although can improve the strength, but plastic toughness will loss, can lead to tension spring hook or torsional spring bending leg when a fault occurs. 6, compression spring: mild hypothermia after hammering tempering can reduce the deformation. At the beginning of July and tension spring: after tempering treatment stress there will be a loss, loss should be considered when setting deviation allowed. After 8, torsion spring, coil spring 280 ℃ tempering treatment, such as coil spring to rework, after low temperature tempering temperature is 250 ℃. 9: the hook and torsion spring, tension spring arm position will change after tempering, for accurate position requirement, should grasp the variation.
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