| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for directly forming a shaft hole having a flange in a metal plate. SOLUTION: The shaft hole forming method for forming a shaft hole having a flange part 17 on a fore end by pressing a metal plate 20 includes an erection-working step of forming an erection part 14 to be erected with respect to a surface of the metal plate 20 by using a burring punch 320 and a burring die 310, and an opening step of opening a part in a vicinity of the fore end of the erection part 14 radially with respect to the axis of a cylindrical part by using an opening punch and an opening die. The erection part 14 erected with respect to the surface of the metal plate and the flange part 17 extending radially from the fore end of the erection part are formed. COPYRIGHT: (C)2007,JPO&INPIT
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