发明申请
- 专利标题： SQUARE PIPE, FRAME STRUCTURE, SQUARE PIPE MANUFACTURING METHOD, AND SQUARE PIPE MANUFACTURING APPARATUS
- 专利标题（中）： 方管，框架结构，方管制造方法及方管制造设备
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申请号： US12647758申请日： 2009-12-28
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公开(公告)号： US20100193064A1公开(公告)日： 2010-08-05
- 发明人: Mikio TAKADA
- 申请人： Mikio TAKADA
- 申请人地址： JP TOKYO
- 专利权人： TOPRE CORPORATION
- 当前专利权人： TOPRE CORPORATION
- 当前专利权人地址： JP TOKYO
- 优先权： JP2009-024846 20090205
- 主分类号： F16L9/00
- IPC分类号： F16L9/00 ; B21C37/06 ; B21D17/02
摘要：
A square pipe manufacturing method includes: a first processing step of forming a first intermediate formed product 13 by bending both widthwise end portions of a rectangular metal plate 1; a second processing step of forming a second intermediate formed product 21 by bending both widthwise sides of a bottom surface 11 of the first intermediate formed product 13; a third processing step of obtaining a third intermediate formed product 23 by curving the side wall surfaces 17 to be convex outward in the width direction by pressing the flange parts 7, 7 toward the bottom wall surface 19 and then pressing the curved side wall surfaces 17 inward in the width direction; and a fourth processing step of crush-deforming corners 31, 31, 33, 33 of the third intermediate formed product 23.