Title:
PRESS-FORMED PRODUCT
Document Type and Number:
WIPO Patent Application WO/2013/094705
Kind Code:
A1
Abstract:
Provided is a press-formed product capable of inexpensively providing a shock-absorbing member having a high crushing load with respect to a 3-point bending load. The press-formed product of a steel plate (13) is provided with a main body (24) having a hat-shaped cross-sectional surface and also extending in one direction, wherein the cross-sectional surface has a bottom part (20a) and a shoulder part (20c) connected to the bottom part (20a) through an R tangent (25). In the cross-sectional surface, there are first regions (27) spaced apart by a predetermined distance in a direction where the bottom part (20a) extends from the R tangent (25), and second regions (28) which are a part of the bottom part (20a) and connected to the first regions (27). Herein, the first and second regions have a work-hardening distribution satisfying the relationship of Hv1>1.05×Hv2, where Hv1 is an average hardness over a region ranging from the surface of the steel plate (13) in the first region (27) introduced by press-molding the main body (24), up to a depth obtained by multiplying the thickness of the steel plate (13) by 0.2, and Hv2 is an average hardness over a region ranging from the surface of the steel plate (13) in the second region (28), up to a depth obtained by multiplying the thickness of the steel plate (13) by 0.2.
Inventors:
NAKATA MASAHIRO (JP)
SUZUKI TOSHIYA (JP)
TOKUDA TOMOKICHI (JP)
ICHIKAWA MASANOBU (JP)
ICHIMARU NOBUYUKI (JP)
SUZUKI TOSHIYA (JP)
TOKUDA TOMOKICHI (JP)
ICHIKAWA MASANOBU (JP)
ICHIMARU NOBUYUKI (JP)
Application Number:
PCT/JP2012/083141
Publication Date:
June 27, 2013
Filing Date:
December 20, 2012
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
TOYOTA TEKKO KK (JP)
TOYOTA TEKKO KK (JP)
International Classes:
B21D22/26; B21D24/00
Foreign References:
| JP2009061473A | 2009-03-26 | |||
| JP2009208149A | 2009-09-17 | |||
| JP2012051005A | 2012-03-15 | |||
| JP2000042635A | 2000-02-15 | |||
| JP3572950B2 | 2004-10-06 | |||
| JPS63133821U | 1988-09-01 | |||
| JPH0357423U | 1991-06-03 | |||
| JPH1017933A | 1998-01-20 | |||
| JP4208044B2 | 2009-01-14 | |||
| JP2004276031A | 2004-10-07 |
Other References:
See also references of EP 2796221A4
Attorney, Agent or Firm:
HIROSE SHOICHI (JP)
Hirose Shoichi (JP)
Hirose Shoichi (JP)
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Claims: