| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a new method of correcting the heat deformation of an annular body capable of easily correcting the annular body in a perfect circular shape, and to provide its hardening method. <P>SOLUTION: In the heat deformation correcting method, the deformation caused when performing the heating treatment of an annular body 10 formed of steel is straightened. After the annular body 10 is subjected to gas soft-nitriding or salt-bath nitriding treatment, the annular body 10 is heated to the temperature equal to or higher than the A<SB>c1</SB>transformation point in such a state that its outside diameter is restrained by an outside diameter restraining die 20. Any distortion or deformation of the annular body 10 before it is heated is completely removed, and the shape of the annular body 10 can be easily corrected to the shape close to the perfect circular shape. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
