About bearing collar heat treatment swelling technology, the most troubling is the amount of swelling, especially bearing collar products after heat treatment swelling a large amount of large, light by increasing the bearing collar grinding allowance, grinding times, or directly lead to bearing collar scrap. What are the factors of the bearing collar heat treatment after a large amount of expansion? How to solve this problem occurs? I share the following knowledge based on understanding. Bearing collar heat treatment after the expansion of a large number of factors As we all know, bearing collar quenching swelling is due to the quenching before the pearlite and quenching after the martensite organization of the specific tolerance difference caused. Steel heat treatment in addition to tissue transformation also produces thermal stress and tissue stress if the transient stress exceeds the yield strength of the tissue will cause plastic deformation to change the actual amount of swelling. In addition, the presence of residual austenite and the appearance of non-martensite also affects the amount of expansion. The content of the various components in the organization formed after quenching and the size of the residual stress is the main factor that determines the change in the quenched and tempered size of the bearing steel. Bearing rings after heat treatment swelling a large number of solutions (1) in the hot oil additive can reduce the expansion of bearing rings quenching products to improve the expansion of a large number of qualified rate. (2) Improve the cooling cycle of quenching oil, can reduce the amount of expansion of bearing rings after quenching. (3) bearing collar quenching expansion and bearing collar structure size of the larger relationship between some bearing collar expansion and some bearing collar shrinkage. (4) The choice of cold oil quenching of the bearing collar product expansion is relatively small.

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