| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a forged product without causing dent and lap. SOLUTION: A blank 10 has convex-surface parts 13 composed of a plurality of steps at a portion corresponding to a cylindrical part of the forged product. The position of a boundary 14 between a first step 13a and a second step 13b from the outer periphery of the convex surface part composed of the plurality of steps is made smaller than the inner diameter of the cylindrical part in the forged product, and the interval between the respective steps in the plurality of steps is connected with a smooth curve surface. Thus, the forged product can be produced without causing any dent at the bottom part and any lap at the edge part of the cylindrical part. COPYRIGHT: (C)2007,JPO&INPIT
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