MOTHER PIPE FOR HYDRAULIC BULGING, HYDRAULIC BULGING DEVICE USING THE SAME, HYDRAULIC BULGING METHOD, AND HYDRAULICALLY BULGED PRODUCT

WIPO Patent Application WO/2005/070582

A1

A mother pipe (TP2) for hydraulic bulging having such a peripheral length that an outer diameter is gradually increased or decreased from one to the other end thereof in the axial direction, wherein holding parts (TP2a, TP2b) having the peripheral length increasing toward the end face of the pipe on the one end are formed at least on the one end. A parallel part may be formed on the other end where the holding part is not formed. In a method and a device for bulging using the mother pipe, even when the mother pipe having a cross sectional shape largely varying in the axial direction is used, the push- bulging from the end of the pipe in the axial direction is allowed. Thus, a hydraulically bulged product to which hydraulic bulging is applied can obtain an expanding ratio larger than before.

TOMIZAWA ATSUSHI (JP)

PCT/JP2004/000507

August 04, 2005

January 21, 2004

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SUMITOMO METAL IND (JP)
SUMITOMO PIPE & TUBE CO LTD (JP)
MITSUBISHI JIDOSHAKOGYO KABUSH (JP)
TOMIZAWA ATSUSHI (JP)

B21D26/045; B21D51/26; (IPC1-7): B21D26/02

WO1998051428A1

1998-11-19

JPS5273168A	1977-06-18
JP2000301249A	2000-10-31
JP2001321842A	2001-11-20
JP2000045767A	2000-02-15
JPS62199232A	1987-09-02
JP2003001336A	2003-01-07
JPS55154616U	1980-11-07
JPS57165134A	1982-10-12

Mori, Michio (Amagasaki Building 17-23, Higashinaniwa-cho 5-chom, Amagasaki-shi Hyogo 92, JP)

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