Title:
Ｌ字型角管の製造方法、Ｌ字型角管の製造装置およびＬ字型角管
Document Type and Number:
Japanese Patent JP6416049
Kind Code:
B2
Abstract:
Provided is a method for manufacturing an L-shaped square pipe that ensures adequate strength even without welding, a device for manufacturing the L-shaped square pipe, and the L-shaped square pipe. Provided is a method for manufacturing an L-shaped square pipe 1A, comprising: a groove section forming step for forming a groove section 5 by pressing one surface 1a of a square steel pipe 1, along the shorter direction of the one surface 1a, towards another surface 1b positioned on the reverse side of the one surface 1a; and a bending step for bending the square pipe so that the sides of the first surface 1a sandwiching the groove section 5 approach each other.
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Inventors:
Ryuji Tagami
Application Number:
JP2015139858A
Publication Date:
October 31, 2018
Filing Date:
July 13, 2015
Export Citation:
Assignee:
Nisshin Steel Co., Ltd.
International Classes:
B21D7/00; B21D11/08
Domestic Patent References:
| JP200147140A | ||||
| JP2003103307A | ||||
| JP2004330282A | ||||
| JP2005305523A | ||||
| JP61162323U | ||||
| JP1241329A | ||||
| JP3929095B1 |
Foreign References:
| GB1481712A |
Attorney, Agent or Firm:
Hayashi Ichiyoshi
Akihiro Kitamura
Akihiro Kitamura