| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for quenching a ring-shaped article with which the thermal deformation generated with a quenching-treatment can be corrected in the case of applying the quenching-treatment, and this thermal deformation-correction is performed without taking a cost and time to various sizes of the ring-shaped articles and further, this quenching-treatment can efficiently be heated to the quenching temperature and the heating time is shortened and this facility can be made to be small. SOLUTION: The method for quenching the ring-shaped article includes a preheating step S1, a soaking step S2, a primary cooling step S3 and a secondary cooling step S4. In the preheating step S1, the ring-shaped article W is heated to a prescribed preheating temperature near the quenching temperature with an induction-heating. In the soaking step S2, the ring-shaped article W is heated till the quenching temperature with a continuous heating furnace. In the primary cooling step S3, the ring-shaped article W is cooled down to a transformation-correction starting temperature at higher temperature than the martenstic transformation point temperature. In the secondary cooling step S4, the ring-shaped article W is cooled down to the temperature lower than the martenstic transformation point temperature. At that time, one pair of receiving rolls 3 are brought into contact so as to be freely rotated, with one part side of the outer peripheral face of the ring-shaped article W, and from the reverse side thereof, a rotated pressurizing roll 4 is pushed to the article. COPYRIGHT: (C)2009,JPO&INPIT |
