Method for manufacturing l-shaped square pipe, device for manufacturing l-shaped square pipe, and l-shaped square pipe

Patent metadata

Field	Value
Publication number	US-2019001388-A1
Application number	US-201615745274-A
Country	US
Kind code	A1
Filing date	Jul 8, 2016
Priority date	Jul 13, 2015
Publication date	Jan 3, 2019
Grant date	—

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, comprising: a groove section forming step for forming a groove section by pressing one surface of a square steel pipe, along the shorter direction of the one surface, towards another surface positioned on the reverse side of the one surface; and a bending step for bending the square pipe so that the sides of the first surface sandwiching the groove section approach each other.

First claim

1 . A method for manufacturing an L-shaped square pipe, the method comprising:
a groove section forming step for forming a groove section by pressing one surface of a square pipe along a shorter direction of the one surface to a side of an other surface located on a reverse side of the one surface; and a bending step for bending the square pipe such that both sides of the one surface sandwiching the groove section approach each other.

2 . The method for manufacturing an L-shaped square pipe according to claim 1 , wherein in
the groove section forming step, the groove section is formed by pressing, to the one surface, a corner portion of a V-shaped portion in a pressing member having the V-shaped portion.

3 . The method for manufacturing an L-shaped square pipe according to claim 2 , wherein
an angle of the corner portion of the V-shaped portion corresponds to a bending angle of the square pipe.

4 . The method for manufacturing an L-shaped square pipe according to claim 1 , the method further comprising,
before the groove section forming step, a buckling line forming step for forming buckling lines by pressing two side surfaces between the one surface of the square pipe and the other surface inward along a longitudinal direction of the side surfaces.

5 . A device for manufacturing an L-shaped square pipe, the device comprising:
a groove section forming device for forming a groove section by pressing one surface of a square pipe along a shorter direction of the one surface to a side of an other surface located on a reverse side of the one surface; and a bending device for bending the square pipe such that both sides of the one surface sandwiching the groove section approach each other.

6 . An L-shaped square pipe, wherein a square pipe is bent through a groove section provided along a shorter direction of one surface thereof.

Assignees

• Nisshin Steel Co Ltd

Inventors

• Tanoue Ryuji

Classifications

• B21D53/74

  frames for openings, e.g. for windows, doors, handbags · CPC title

• E04C2003/0465

  square- or rectangular-shaped · CPC title

• E04C3/06

  with substantially solid, i.e. unapertured, web (E04C3/10, E04C3/11 take precedence {honeycomb girders E04C3/083}) · CPC title

• B21D7/06 Primary

  in press brakes or between rams and anvils or abutments; Pliers with forming dies · CPC title

• B21D11/08

  Bending by altering the thickness of part of the cross-section of the work (B21D11/06 takes precedence) · CPC title