APPARATUS AND METHOD FOR PRESS-BENDING TUBE MATERIAL

WIPO Patent Application WO/2008/102477

A1

A novel apparatus and method for press-bending a tube material, simultaneously achieving three features that are bending with a large bend radius not requiring a large-scale facility and a die, bending less likely to produce wrinkles and buckling inside a bend, and bending with high productivity. The press-bending apparatus bends a tube material at three points by a punch (12) and a set of rolls (13, 13). The punch (12) has a groove (12a) with a width greater than that of a circular tube (11). The set of rolls (13, 13) are supported by a base (14). The rolls (13, 13) are movable on the base (14) in the direction separating from each other while being in contact with the punch (12). The base (14) has a hollow (14a), and the punch (12) that descends and the circular tube (11) that is bent as the punch (12) descends are allowed to move in the hollow (14a) while the circular tube (11) is bent.

MIZUMURA MASAAKI (JP)
KURIYAMA YUKIHISA (JP)

PCT/JP2007/070505

August 28, 2008

October 16, 2007

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NIPPON STEEL CORP (JP)
MIZUMURA MASAAKI (JP)
KURIYAMA YUKIHISA (JP)

B21D7/06

JPH06198348A	1994-07-19
JPS58185324U	1983-12-09
JPS5495544U	1979-07-06
JPS5511245U	1980-01-24
JPS58215224A	1983-12-14
JPH0332427A	1991-02-13

See also references of EP 2127774A4
"Tube Forming", 30 October 1992, CORONA PUBLISHING CO., LTD., pages: 36 - 64
JOURNAL , OF THE JAPAN SOCIETY FOR TECHNOLOGY OF PLASTICITY, vol. 44, no. 508, 2003, pages 530

AOKI, Atsushi et al. (Toranomon 37 Mori Bldg. 5-1,Toranomon 3-chome, Minato-ku, Tokyo 23, JP)

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