Bearing ring expansion after a large number of factors and solution heat treatment

About bearing ring expands heat treatment technology, the most troubling is expanding a lot, especially the bearing ring products after heat treatment bilges when a large number of large, light is by increasing the number of bearing ring grinding allowance, grinding, or as a direct result of bearing ring scrap. The bearing ring expansion after heat treatment is a lot of factors? How to solve this problems? China bearing network according to the relative knowledge sharing is as follows. Bearing ring heat bilges after a lot of factors as is known to all, bearing ring before quenching swell is due to the quenching of pearlite and martensite after quenching, volume difference. Steel heat treatment in addition to the organizational transformation also produce thermal stress and organization stress if the instantaneous stress exceeds the organization yield strength will cause plastic deformation change the actual expansion. In addition, the existence of residual austenite and the advent of martensite is also easily effect a lot. After quenching organization formed by the content of various components and the size of the residual stress is decided the main factors of bearing steel quenching tempering size change. Bearing ring expansion after a large number of solution heat treatment ( 1) This additive is added in the hot oil can reduce the bearing ring quenching product assortments of large increase percent of pass. ( 2) Improve quenching oil cooling circulation situation, can reduce the bearing ring expansion after quenching. ( 3) Bearing ring expansion after quenching a lot with the relationship between the structure size of bearing ring some bearing ring is puffy some larger bearing ring. ( 4) Choose cold oil quenching bearing ring product expansion of relatively small.