| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ring-shaped member heat treatment method and a method of manufacturing a ring-shaped member by means of which a manufacturing cost of a hardening apparatus can be suppressed. <P>SOLUTION: The ring-shaped member heat treatment method comprises the steps of: revolving a coil 21, which is disposed so as to face the rolling contact surface 11 of a ring-shaped molding 10 made of steel and which induction-heats the molding 10, relative to the molding 10 along the circumferential direction thereof to form a ring-shaped heated region in which the steel is austenitized on the molding 10; and simultaneously cooling the entire heated region to the temperature of the Ms point or below. In the step of forming the heated region, each region of the rolling contact surface 11 is heated so as to alternate multiple times between a state exceeding the A1 point temperature and a temperature state below the A1 point temperature at which a supercooled austenite state is maintained. <P>COPYRIGHT: (C)2013,JPO&INPIT |
