Method of producing polygonal closed cross-section structural component with a curved form and polygonal closed cross-section structural component produced by the method

Patent metadata

Field	Value
Publication number	US-2016243603-A1
Application number	US-201414913786-A
Country	US
Kind code	A1
Filing date	Aug 22, 2014
Priority date	Aug 26, 2013
Publication date	Aug 25, 2016
Grant date	—

Abstract

A method of producing a polygonal closed cross-section structural component includes press-forming a metal sheet into a gutter-shaped pre-processed part with a curved form along its longitudinal direction having plural ridge lines corresponding to corner portions of the polygonal closed cross-section in a cross-sectional form developed by cutting the component at a position corresponding to the ridge line located at the innermost side in the radial direction to provide a flange portion extending along the ridge line at the resulting respective ends, and press-forming the pre-processed part to deform inwardly in the cross-sectional direction at a position of one or more of the plural ridge lines to butt the ridge lines located at the innermost side and the flange portions to each other.

First claim

1 - 3 . (canceled)

4 . A method of producing a polygonal closed cross-section structural component with a curved form along its longitudinal direction having plural ridge lines corresponding to corner portions of the polygonal closed cross-section and two flange portions extending in parallel to a flat face including a ridge line located at an innermost side in a radial direction of the curved form of the component along the longitudinal direction among the above ridge lines from a metal plate, comprising:
press-forming the metal sheet into a gutter-shaped pre-processed part with a curved form along its longitudinal direction having plural ridge lines corresponding to the corner portions of the polygonal closed cross-section of the component in a cross-sectional form developed by cutting the component at a position corresponding to the ridge line located at the innermost side in the radial direction to provide a flange portion extending along the ridge line at the resulting respective ends, wherein each of the ridge lines corresponding to the corner portions has a radius of curvature equal to or smaller than a radius of curvature of the corresponding ridge line of the component to have a length equal to or shorter than the length of the corresponding ridge line; and press-forming the pre-processed part to deform inwardly in the cross-sectional direction at a position of one or more of the plural ridge lines to butt the ridge lines located at the innermost side and the flange portions to each other.

5 . The method according to claim 4 , wherein a polygonal line of a groove-shaped cross-section is press-formed along one or more of the plural ridge lines of the pre-processed part at such a ridge line to deform the pre-processed part inwardly in the cross-sectional direction at a position of such a ridge line.

6 . A polygonal closed cross-section structural component with a curved form produced by the method as claimed in claim 4 .

7 . A polygonal closed cross-section structural component with a curved form produced by the method as claimed in claim 5 .

Assignees

• Jfe Steel Corp

Inventors

• Shinmiya Toyohisa
• Kishigami Yasuhiro
• Yamasaki Yuji

Classifications

• B21D47/01 Primary

  beams or pillars · CPC title

• B21D47/04

  composite sheet metal profiles · CPC title

• B21D5/02 Primary

  on press brakes without making use of clamping means · CPC title

• B21D22/02

  Stamping using rigid devices or tools · CPC title

• B21C23/12

  Extruding bent tubes or rods · CPC title