The parts adopt the method of reserved processing amount. Use reasonable cooling methods: The influence of the cooling process of the metal on the deformation after quenching is also a very important cause of deformation. The content includes monitoring the operating mechanical bearing status, replenishing or replacing lubricants, and regular disassembly inspections.
Check the state of the raceway surface, the rolling surface, the mating surface, the wear of the cage, the increase of the bearing clearance, and the damage that is not related to the decrease of dimensional accuracy. The part structure should be reasonable: In the cooling process after metal heat treatment, the thin part always cools faster and the thick part cools slowly. Maintenance items during operation include rotating noise, vibration, temperature, lubricant status, etc.
Use appropriate media: Under the premise of ensuring the same hardness requirements, try to use oily media. The stirring method and speed of quenching affect the deformation. Under the same heat treatment conditions, the deformation of the oily medium after the quenching of the aqueous medium is relatively small. Maintenance should be carried out regularly in accordance with the operating standards of the mechanical operating conditions.
For non-separable small ball bearings, use one hand to support the inner ring horizontally, and rotate the outer ring to confirm whether it is smooth. Hot oil quenching has less deformation than cold oil quenching, generally controlled at 100±20℃. Moreover, compared with the oily medium, the water temperature change has a greater influence on the cooling characteristics of the aqueous medium. The faster the cooling rate of metal heat treatment, the more uneven the cooling, the greater the stress, and the greater the deformation of the mold
Tags: mechanical bearing
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