公开(公告)号：US06374657B1

公开(公告)日：2002-04-23

申请号：US09699742

申请日：2000-10-30

申请人： William A. Kirk ,  Benjamin Derr

发明人： William A. Kirk ,  Benjamin Derr

IPC分类号： B21D2226

CPC分类号： B21D22/30

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.

摘要翻译： 制造具有形成在其中的至少一个轴向延伸的肋的类型的罐体的方法包括：第一成形步骤，其形成具有侧壁的第一成形步骤，所述侧壁具有形成在其中的至少一个轴向延伸的肋，以及与所述侧壁共同延伸的底部 侧壁并且在边缘处与侧壁相交。 执行该第一成形步骤使得底部的至少一部分相对于边缘凹陷预定深度。 该方法还包括对预成型件进行第二次拉伸操作以形成具有凸起底部的罐体的第二步骤。 重要的是，预定深度足以防止轴向延伸的肋被拉入所述凸起底部。