Title:
角パイプ、フレーム構造体、角パイプの製造方法、および、角パイプの製造装置
Document Type and Number:
Japanese Patent JP5433243
Kind Code:
B2
Abstract:
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.
Inventors:
Takada Mikiro
Application Number:
JP2009024846A
Publication Date:
March 05, 2014
Filing Date:
February 05, 2009
Export Citation:
Assignee:
Topre Corporation
International Classes:
B21D5/01; B21D47/01
Domestic Patent References:
| JP2003260517A | ||||
| JP7018485U | ||||
| JP2003245717A | ||||
| JP2004034063A | ||||
| JP11290940A |
Attorney, Agent or Firm:
Hidekazu Miyoshi
Iwa Saki Kokuni
Kawamata Sumio
Masakazu Ito
Shunichi Takahashi
Toshio Takamatsu
Iwa Saki Kokuni
Kawamata Sumio
Masakazu Ito
Shunichi Takahashi
Toshio Takamatsu