What are the problems of tempering treatment?
Time：2023-11-28
Source： Network
1. Avoid spring tempering by increasing the temperature to shorten the time.
2. Shrinking diameter: the outer diameter of the carbon steel spring will be reduced when it is tempered, so some dimensions should be reserved for the coil spring.
3. Hardness: With the increase of tempering temperature, the hardness decreases after a slight increase. The temperature of good fatigue performance is slightly lower than the temperature of dry hardness.
4. Spring tempering color: The tempering color is related to the temperature and the residue on the surface of the steel wire, and the uneven color is related to the temperature distribution or the airflow in the furnace.
5. If the desired color is uniform, to manage the furnace and loading methods: if there is local oil or fingerprints, it will change color after tempering.
6. Pressure spring: mild low temperature tempering after hammering can reduce deformation.
7. tension spring: after tempering treatment, the initial stress will be lost, and the allowable loss should be considered when setting the deviation.
8. Tempering temperature. Generally, the tempering temperature is 250-280 ℃. If the steel wire is externally treated at 200-250 ℃, although the strength and toughness of the old steel wire can be lost, it can lead to broken rows when bending eyes such as hooks or twisting are pulled.
9. Torsion spring: 280 ℃ tempering treatment is carried out after the coil spring, such as reprocessing after the coil spring, the low temperature tempering temperature is 250 ℃.
10. The hook of the tension spring and the analogy of the torsion spring: the position will change after tempering. If there is an accurate position requirement, the change amount should be mastered.
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