METHOD OF MANUFACTURING CLOSED STRUCTURAL MEMBER, PRESS-FORMING DEVICE, AND CLOSED STRUCTURAL MEMBER

Title:

METHOD OF MANUFACTURING CLOSED STRUCTURAL MEMBER, PRESS-FORMING DEVICE, AND CLOSED STRUCTURAL MEMBER

Document Type and Number:

WIPO Patent Application WO/2010/035887

Kind Code:

A1

Abstract:

A method of efficiently manufacturing a closed structural member by using a reduced number of parts and manufacturing processes for the closed structural member. In a hem pressing step, a punch (84) is further lowered to the press position side to insert a pair of flange sections (20, 22) into a slit groove (102) and to bend a hem projection (28). This causes a flange section (22) to be clamped by the hem projection (28) to thereby join the flange section (20) to the flange section (22). At the same time as above, a metallic plate is pressed by a pair of press-forming surfaces (96) of the punch (84) to form a pair of shoulder sections (26) of a blank (24) into a predetermined shape. As a result, the flange section (20) can be fixed (joined at the hem projection (28) thereof) to the flange section (22) and, at the same time, the pair of shoulder sections (26) of the blank (24) can be pressed into a predetermined shape.

Inventors:

HIGAI KAZUHIKO (JP)
YAMASAKI YUJI (JP)
HIRA TAKAAKI (JP)
OCHI KATSUHIRO (JP)

Application Number:

PCT/JP2009/067129

Publication Date:

April 01, 2010

Filing Date:

September 24, 2009

Export Citation:

Click for automatic bibliography generation Help

Assignee:

JFE STEEL CORP (JP)
HIGAI KAZUHIKO (JP)
YAMASAKI YUJI (JP)
HIRA TAKAAKI (JP)
OCHI KATSUHIRO (JP)

International Classes:

B21D47/01; B21D22/26; B21D39/02

Foreign References:

JP2006247748A	2006-09-21
JP2000515432A	2000-11-21
JPS5124666U	1976-02-23
JP2007176361A	2007-07-12
JPH05228557A	1993-09-07

Other References: