公开(公告)号：US4309890A

公开(公告)日：1982-01-12

申请号：US84033

申请日：1979-10-11

申请人： Shigeo Ichikawa ,  Satoru Nomichi ,  Masaki Sinoda

发明人： Shigeo Ichikawa ,  Satoru Nomichi ,  Masaki Sinoda

IPC分类号： B21D5/01 ,  B21D5/10 ,  B21D51/10 ,  B21D53/10 ,  B21C37/06

CPC分类号： B21D51/10 ,  B21D53/10 ,  Y10T29/49673

摘要： A strip material is subjected to an end bending step, and subsequently the bent ends of the strip material, namely, those portions of the strip material which are located adjacent to its abutting ends, are pre-coined to increase the accuracy in the region of the abutting ends, followed by a conventional U-bending and a final coining step, thereby producing a cylindrical material. The use of the pre-coining step for the abutting ends improves the circularity of the cylindrical member.

摘要翻译： 条带材料经受端部弯曲步骤，随后条带材料的弯曲端部，即位于其邻接端附近的条带材料的那些部分被预先制造，以提高在 邻接端部，然后是常规的U形弯曲和最终的压印步骤，从而产生圆柱形材料。 使用用于邻接端部的预压印步骤改善了圆柱形构件的圆形度。