发明申请
- 专利标题： Method for press punching a hole in sheet metal and press die
- 专利标题（中）： 冲压金属板和冲压模具孔的方法
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申请号： US10320708申请日： 2002-12-17
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公开(公告)号： US20040112188A1公开(公告)日： 2004-06-17
- 发明人: Masatoshi Oishi
- 主分类号： B26D001/00
- IPC分类号： B26D001/00 ; B26D003/00 ; B26F001/14
摘要：
A punch unit for a press die for punching a hole in sheet metal includes: a piercing punch provided with a sharp projection; a plunger for pressing the piercing punch; a cylinder for supporting the piercing punch and the plunger slidably in a punching direction; and a coil spring for retracting the piercing punch and the plunger. Also disclosed are a press die for punching a hole in sheet metal and a punching method using the punch unit.
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