PRESS-MOLDING METHOD - NIPPON STEEL & SUMITOMO METAL CORP

Title:

PRESS-MOLDING METHOD

Document Type and Number:

WIPO Patent Application WO/2014/112056

Kind Code:

A1

Abstract:

This method press-molds a final molded article that is provided with a top plate section, a vertical wall section, and a flange section, and that has at least one curved section in the lengthwise direction thereof. The press-molding method has: a first molding step that, when forming the top plate section, the vertical wall section, the curved section, and the flange section, in a plane perpendicular to a high-strength steel plate and containing a horizontal line linking the center of the curve of the curved section and the intersection section of the flange section and the vertical wall section, the flange section is worked in a bending manner at the intersection section until the angle of the flange section with respect to the horizontal line becomes α1; and a second molding step that additionally bends/works the flange section at the intersection section after the first molding step until the angle of the flange section with respect to the horizontal line in the plane becomes α2. The additional bending angle β, which is α1 - α2, is caused to be in a predetermined range, reducing warping and torsion of the final molded article.

Inventors:

UCHIYAMA SHIGERU (JP)
TANAKA YASUHARU (JP)
MIYAGI TAKASHI (JP)
OGAWA MISAO (JP)

Application Number:

PCT/JP2013/050692

Publication Date:

July 24, 2014

Filing Date:

January 16, 2013

Export Citation:

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Assignee:

NIPPON STEEL & SUMITOMO METAL CORP (JP)

International Classes:

B21D5/01; B21D53/88

Foreign References:

JP2006015404A	2006-01-19
JP2008023601A	2008-02-07
JP2004025273A	2004-01-29
JPH11290951A	1999-10-26
JP2006289480A	2006-10-26
JP2004195535A	2004-07-15

Other References: