发明授权
US4213323A Method and apparatus for extruding a burred edge of a hole in a metal
sheet
失效
用于在金属板中挤出孔的毛边的方法和装置
- 专利标题： Method and apparatus for extruding a burred edge of a hole in a metal sheet
- 专利标题（中）： 用于在金属板中挤出孔的毛边的方法和装置
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申请号： US859644申请日： 1977-12-12
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公开(公告)号： US4213323A公开(公告)日： 1980-07-22
- 发明人: Johannes A. G. De Deugd
- 申请人： Johannes A. G. De Deugd
- 申请人地址： NY New York
- 专利权人： U.S. Philips Corporation
- 当前专利权人： U.S. Philips Corporation
- 当前专利权人地址： NY New York
- 优先权： NLX7614120 19761220
- 主分类号： B21C37/29
- IPC分类号： B21C37/29 ; B21D19/08 ; B21D22/00
摘要：
Method and apparatus for extruding burr holes in a metal sheet, in which a punch with a conical end portion and adjoining cylindrical portion of a diameter greater than the inner burr diameter is passed through the burr. The conical end portion has a half apex angle between 10.degree. and 20.degree., and the axial length of the cylindrical portion and the coefficient of friction between the cylindrical portion and the burr wall are selected according to a specified relationship.
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