公开(公告)号：US20100193064A1

公开(公告)日：2010-08-05

申请号：US12647758

申请日：2009-12-28

申请人： Mikio TAKADA

发明人： Mikio TAKADA

IPC分类号： F16L9/00 ,  B21C37/06 ,  B21D17/02

CPC分类号： E04B2/58 ,  B21C37/0803 ,  B21C37/0815 ,  B21C37/155 ,  E04C3/32

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.

摘要翻译： 方管制造方法包括：第一处理步骤，通过弯曲矩形金属板1的宽度方向两端部形成第一中间成形品13; 第二处理步骤，通过弯曲第一中间成形品13的底面11的宽度方向两侧来形成第二中间成形品21; 第三处理步骤，通过将凸缘部分7,7压向底壁表面19，然后将弯曲的侧壁表面17按压，使侧壁表面17弯曲成宽度方向向外凸出来获得第三中间成形品23 在宽度方向向内; 以及第三中间成形品23的角部31,31,33,33的压溃变形的第四加工工序。