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Bearing rings need tempering causes and precautions

Source: Time,Time:2014/8/24 18:08:30

The main reason for the need for bearing rings after quenching and tempering are: 1 in order to remove internal stress 2 In order to accelerate the aging effect, prompting the production process in the future, will not be changing the size and shape of the ferrule.
The main reason for the need for bearing rings after quenching and tempering are: 
     1 in order to remove internal stress 
     2 In order to accelerate the aging effect, prompting the production process in the future, will not be changing the size and shape of the ferrule. 
     3 In order to obtain a predetermined hardness. 
     Minimum tempering temperature limit - that began forming temperature Madden body for bearing steel, the temperature close to 140 degrees. Tempering at low temperature, in order to get good results only in a very long incubation time. 
     Tempering temperature rise limit determined by the minimum required hardness of the bearing. 
     When heated above the Mk, Madden decomposition of forming tissue troostite. At this reduced hardness. When tempering temperature of 200 degrees, the hardness decreased little about near three Hrc units. Therefore, if the ferrule correctly quenching, the hardness after quenching 64-65Hrc, then it can be regarded as a minimum hardness 61Hrc. 
     This hardness corresponds generally able to guarantee the best working life of the bearing rings need hardness. 
     In actual operation, the time for tempering the bearing rings is two hours. Tempering applications stove or trough. Box furnace completely unused, because the internal temperature unevenly distributed, especially at low temperatures even more. Should adopt the so-called circulating furnace with forced air circulation. 
     Trough applications have heat quickly and evenly bath tank and fuel tank, but there are disadvantages - rings out from the tank, require special cleaning.
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