| 摘要 |
PROBLEM TO BE SOLVED: To prevent a crack from being caused in the part to be worked when the plasticity working accompanied with the elongation like a burring process is applied to a metallic shell or other metallic plate member of a miniature disk cartridge. SOLUTION: Slits S are previously formed around a bottom hole 21 formed on the metallic plate member 20 prior to the burring process. COPYRIGHT: (C)2004,JPO
|
