| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a bearing ring of a rolling bearing, which has a higher heat treatment efficiency and causes less deformation during heat treatment, compared with a conventional method.SOLUTION: First, an inner ring 7 is carburized by induction heating it to a temperature above the A1 transformation temperature under reduced pressure in a primary heat treatment chamber 1 and then cooled to a temperature below the A1 transformation temperature. Next, it is inductively heated to a temperature above the A1 transformation temperature in the induction heating coil 22 of an induction heating section 2. Next, it is subjected to quenching and correction in a secondary quenching and correction section 3. Before it reaches the Ms point in the course of cooling, the inner ring 7 is placed in an outside diameter restraining die 34 and cooled until it reaches the Ms point or below. Next, it is subjected to high-frequency tempering in a tempering section 4. |
