| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for inexpensively quenching an annular member even with a large diameter and a thin wall, so as to cause little deformation. SOLUTION: This heat treatment method is characterized by passing a columnar salient 11b of a holding tool 10 into a central bore of the annular member 1 made of steel, and making a size of a first gap C1 between an internal perimeter surface of the annular member 1 and an outer circumferential surface 21 of the salient 11b, to more than 0% but 0.11% or less of the inside diameter D of the annular member 1. The method is also characterized by sandwiching the annular member 1 between two holding surfaces 22 and 23 of the top and the bottom included in the holding tool 10, and making the size of a second gap C2 between the annular member 1 and the retention surface 23 to 6% or less of a width h of the annular member 1. The annular member 1 is then quenched in a state of being mounted on the holding tool 10. COPYRIGHT: (C)2004,JPO
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