| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of an inver leaf spring for switching with longer service life, aimed at through the restraint of occurrence of cracks. SOLUTION: The manufacturing method of a reverse leaf spring, formed of a freely reversible metal thin plate formed into a dome shape, comprises a first process of punching a strip hoop material 1, and forming an outer shape of the reverse leaf spring 2 and a tying crosspiece 13 tying the reverse leaf spring 2 and a surrounding part; a second process of forming an inside base part 15 by folding a whole periphery of an outer peripheral edge part including a part connecting to the tying crosspiece 13 of the reverse leaf spring 2, and a circular flange part 4 at its outer periphery; and forming a swollen part 3, by making the base part swollen toward the folded direction of the circular flange part 4 to be free in reversing, and a third process of cutting the tying crosspiece 13 and separating the reverse leaf spring 2. COPYRIGHT: (C)2008,JPO&INPIT
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