QUENCHING METHOD AND DEVICE OF RING-SHAPED ARTICLE

摘要

A quenching method of a ring-shaped article in which thermal deformation due to quenching treatment can be corrected during quenching treatment without taking a cost and time, and ring-shaped articles of various sizes can be quenched. The quenching method of a ring-shaped article comprises a step (S1) for heating a ring-shaped article (W) to quenching temperature, a primary cooling step (S2) for cooling the ring-shaped article (W) heated to the quenching temperature down to a deformation correction starting temperature higher than the martensitic transformation point temperature, and a secondary cooling step (S3) for cooling the ring-shaped article (W) cooled down to the deformation correction starting temperature further down to a temperature lower than the martensitic transformation point temperature while pressing a pressure roll (4) rotating about the central axis of rotation parallel with the center of the ring-shaped article (W) against the outer circumferential surface of the ring-shaped article (W) from the side facing the middle point of a pair of receiving rolls (3) through the ring-shaped article (W) under such a state as the pair of receiving rolls (3) are touching the outer circumferential surface of the ring-shaped article (W) to roll freely about the central axis of rotation parallel with the center of the ring-shaped article (W).