发明授权
- 专利标题: Method and apparatus for hole punching
- 专利标题(中): 打孔方法和装置
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申请号: US11440050申请日: 2006-05-25
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公开(公告)号: US07690236B2公开(公告)日: 2010-04-06
- 发明人: Atsushi Otaki
- 申请人: Atsushi Otaki
- 申请人地址: JP Tokyo
- 专利权人: Showa Denko K.K.
- 当前专利权人: Showa Denko K.K.
- 当前专利权人地址: JP Tokyo
- 代理机构: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- 优先权: JP2005-153770 20050526
- 主分类号: B21J13/00
- IPC分类号: B21J13/00 ; B21D22/06
摘要:
A hole punching method capable of executing hole punching with high material yield at a low load and preventing occurrence of underfill is provided. The hole punching method includes a step of expanding a hole punching scheduled portion 2 of a raw material 1 disposed in a cavity 12 of a closed die 11 by pressing the hole punching scheduled portion 2 from opposite sides thereof across the hole punching scheduled portion 2 with a pair of large diameter punch and small diameter punch 13 and 15 different in diameter and arranged to as to face each other so that unfilled portions remain in the cavity, a step of penetrating the small diameter punch 13 into the hole punching scheduled portion 2 of the raw material 1 while releasing or after releasing pressurization by the large diameter punch 15 to the hole opening scheduled portion 2, and a step of penetrating the large diameter punch 15 into the hole punching scheduled portion 2 of the raw material 1 while pulling out or after pulling out the small diameter punch 13 penetrated in the hole punching scheduled portion 2 of the raw material 1 from the hole punching scheduled portion 2 of the raw material 1.
公开/授权文献
- US20060288754A1 Method and apparatus for hole punching 公开/授权日:2006-12-28
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