How to find a suitable high temperature resistant bearings?
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Bearing is formed after heat treatment quenching crack is how to return a responsibility?
by：Waxing
2020-11-19
Bearing parts after heat treatment of the common quality defects are: quenching microstructure overheating, less heat, quenching crack, hardness is not enough, heat treatment deformation, surface decarburization, soft point etc.
Jiaxing bearing factory today is mainly to introduce what is the quenching crack and the cause of formation.
Definition: bearing parts in the process of hardening cooling by internal stress of crack according to quenching crack.
Second, the reason: 1.
Due to quenching heating temperature is too high or cooling, the thermal stress and quality of metal volume change of the organization stress is greater than the fracture strength of steel;
2.
The original defects on the surface of the work (
Such as surface microcrack or scratches)
Or steel internal defects (
The non-metallic inclusions such as slag, serious, white spots, shrinkage residual, etc. )
When quenching form stress concentration;
3.
Serious surface decarbonization and carbide segregation;
4 parts after quenching and tempering is insufficient or not timely tempering;
5, the previous process caused by salt stress, cold forging folding, deep turning tool and the oil groove sharp edges, etc.
In conclusion, the causes of quenching crack could be one or more of the above factors, the existence of internal stress is the main reason for the formation of quenching cracks.
Jiaxing bearing group sales co. , LTD is bearing factory in jiaxing at the center of the province of spot directly, specializing in HRB bearing brand, service users, service call, you are welcome to inquire.
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