Importance

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Abstract

A method for heat treating a bearing ring includes performing an induction heating treatment and a liquid spraying treatment on a first radial surface so that a radial thickness of the bearing ring is hardened, performing an induction heating treatment on an opposite radial surface so that the temperature near the opposite radial surface reaches 820-950° C., and at the same time spraying liquid on the first radial surface so that the temperature of the first radial surface does not exceed 150° C., spraying liquid on the second radial surface after the induction heating treatment so that the bearing ring forms a hardened second radially outer portion, a hardened second radially inner portion, and a second radially middle portion having a hardness lower than that of the second radially outer portion and the second radially inner portion, and then performing a low-temperature tempering treatment on the bearing ring.

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First Claim