1. The concept of tempering:

The hardened steel heated to the following a Ac1 temperature, heat preservation time cooling to room temperature heat treatment process called tempering.

2. The purpose of tempering:

(1) the tempering process: after quenching rings into back to the stove (common fan air furnace, with the oven, oil furnace and XiaoYan furnace)

Heated to temper temperature, heat preservation 2 ~ 3 h, in the air in the free cooling.

(2) the tempering of the objective: to relieve quenching stress, prevent cracking; Stable organization, and stable size; Improve toughness.

(3) high temperature tempering: some bearing with organization, performance and dimension stability specific requirements, the need of high temperature tempering treatment.

 
(4) the heat treatment of bearing rings in the grinding process, will produce the grinding stress. Grinding stress make after heat treatment residue in the internal stress metal collar to distribution, will lead to the precision of the collar is changed, even produce surface cracking. Grinding again immediately after the tempering temperature with less than 20 ~ 30 ℃ temperature again tempering (but need to take measures to avoid oxidation and affect surface roughness), can in time to eliminate grinding stress, further stabilize organization, and improve the precision of collar stability. This kind of tempering that additional tempering.



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