发明授权
- 专利标题: Method of making bump-up can bottom
- 专利标题(中): 制作凸起的方法可以是底部
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申请号: US09699742申请日: 2000-10-30
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公开(公告)号: US06374657B1公开(公告)日: 2002-04-23
- 发明人: William A. Kirk , Benjamin Derr
- 申请人: William A. Kirk , Benjamin Derr
- 主分类号: B21D2226
- IPC分类号: B21D2226
摘要:
A method of making a can body of the type that has at least one axially extending rib formed therein includes a first forming step of creating a preform having a sidewall that has at least one axially extending rib formed therein and a bottom that is coextensive with the sidewall and intersects the sidewall at a rim. This first forming step is performed so that at least a portion of the bottom is recessed by a predetermined depth with respect to the rim. The method further includes a second step of performing a second drawing operation on the preform to form a can body having a bump-up bottom. It is important that the predetermined depth be sufficient to prevent the axially extending rib to be drawn into said bump-up bottom.