| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for forming an undercut part which achieves shortening of the working steps and the working time, and reduction in the required area for equipment, and contributes to saving energy. SOLUTION: The method for forming the undercut part includes a first press-working step of forming a wall surface part 10a on a metal plate 5 in a direction crossing the surface of the metal plate, a second press-working step of forming a thickened part 11a on the wall surface part by coining a part in a vicinity of the wall surface part on the surface part of the metal plate, and a third press-working step of forming an undercut part 1a by pressing the thickened part by a punch. COPYRIGHT: (C)2011,JPO&INPIT
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