| 摘要 |
PROBLEM TO BE SOLVED: To reduce a manufacturing cost by reducing the length of an ironing-working, in the ironing-working method for forming a cup shape part of a worked product by applying plastic deformation. SOLUTION: A bar-shaped molding die 20 provided with a guide surface forming part 22 for forming the guide surface on the inner surface of the cup shape part 10 of the worked product W and a clearance forming part 23 for forming the clearance part on the inner surface of the cup shape part continued to the tip end part from the guide surface, is inserted into the cup shape part of an intermediate blank WN of the worked product, and passed through in a die 30 provided with an ironing hole 31 having a tapered surface 31a and then, the inner surface of the cup shape part is plastically deformed into the shape abutted on the outer surfaces of the guide surface forming part and the clearance forming part. The most tip position A of the ironing as the most tip end side in the position abutted on the intermediate blank in the tapered surface, is set near on the line crossing at the right angle with the tapered surface passed through the boundary position B of the guide surface forming part and the clearance forming part. COPYRIGHT: (C)2006,JPO&NCIPI
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