Title:
METHOD OF HYDROFORMING WORK
Document Type and Number:
WIPO Patent Application WO/2008/130055
Kind Code:
A1
Abstract:
A method of hydroforming work that allows obtaining of a hydroforming molded
item of large tube expansion ratio and complex configuration and allows the working
through a reduced number of working steps. The method of hydroforming work is
includes fitting a metal tube to a split mold, clamping the mold and applying an
internal pressure and a push force along the axis of the tube to the metal tube.
In the first hydroforming step, the metal tube is expanded in one direction of
a cross section of the metal tube so as to obtain an intermediate product that,
in the entirety of a tube expanded area along the axis of the tube, has a circumferential
length ranging from 90 to 100% of the circumferential length of a product configuration
and that, in the above one direction, has a height greater than that of the product
at at least a portion along the axis of the tube. Thereafter, in the second hydroforming
step, the intermediate product is formed into the final product while reducing
the height thereof in the above one direction in the entirety or a part along the
axis of the tube. Further, in the event of a bent configuration, a bending step
is implemented between the first hydroforming step and the second hydroforming
step.
Inventors:
MIZUMURA MASAAKI (JP)
KURIYAMA YUKIHISA (JP)
KURIYAMA YUKIHISA (JP)
Application Number:
PCT/JP2008/057992
Publication Date:
October 30, 2008
Filing Date:
April 18, 2008
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
MIZUMURA MASAAKI (JP)
KURIYAMA YUKIHISA (JP)
MIZUMURA MASAAKI (JP)
KURIYAMA YUKIHISA (JP)
International Classes:
B21D26/033; B21D26/043
Foreign References:
| JP2004255445A | 2004-09-16 | |||
| JP2003088927A | 2003-03-25 | |||
| JP2002219525A | 2002-08-06 | |||
| JP2002153917A | 2002-05-28 | |||
| JP2002100318A | 2002-04-05 | |||
| JP2002219525A | 2002-08-06 | |||
| JP2006006693A | 2006-01-12 |
Other References:
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, vol. 45, no. 524, 2004, pages 715
See also references of EP 2143508A4
See also references of EP 2143508A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (Toranomon 37 Mori Bldg.5-1, Toranomon 3-chome, Minato-k, Tokyo 23, JP)
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