| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for manufacturing the race ring of a rolling bearing, in which in a hardening stage for performing cooling after the induction heating with an aqueous cooling agent, any residual tensile stress is not present in its surface. <P>SOLUTION: As a hardening stage, a race ring is induction-heated to the temperature equal to or higher than the austenitic transformation temperature, and cooling liquid is jetted to the rotating race ring, and the race ring is water-cooled so that the surface temperature of the race ring reaches the temperature range from the temperature higher than the martensitic transformation starting temperature to 500°C, and then, the race ring is gas-cooled until the temperature becomes equal to or lower than the martensitic transformation starting temperature. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
