DEFORMED ELEMENT PIPE FOR HYDRAULIC BULGING, HYDRAULIC BULGING DEVICE USING THE ELEMENT PIPE, HYDRAULIC BULGING METHOD USING THE ELEMENT PIPE, AND HYDRAULIC-BULGED PRODUCT

Title:

DEFORMED ELEMENT PIPE FOR HYDRAULIC BULGING, HYDRAULIC BULGING DEVICE USING THE ELEMENT PIPE, HYDRAULIC BULGING METHOD USING THE ELEMENT PIPE, AND HYDRAULIC-BULGED PRODUCT

Document Type and Number:

WIPO Patent Application WO/2004/041458

Kind Code:

A1

Abstract:

A deformed element pipe for hydraulic bulging having a peripheral length with an outer diameter gradually increasing or decreasing from one to the other axial side thereof and having a parallel part formed at least one end thereof, and a hydraulic bulging device and a hydraulic bulging method using the element pipe, the device and the method whereby, for example, even when a deformed steel pipe having a cross sectional shape varying in the axial direction as in a tapered pipe is hydraulically bulged, a bulging in which an internal pressure loading and an axial pressing are combined with each other can be performed to provide a larger expansion ratio than before and the joining and plug-in connection thereof to the other part can also be easily performed.

Inventors:

TOMIZAWA ATSUSHI (JP)
KOJIMA MASAYASU (JP)

Application Number:

PCT/JP2003/014284

Publication Date:

May 21, 2004

Filing Date:

November 10, 2003

Export Citation:

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Assignee:

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

International Classes:

B21D26/033; B21D26/045; (IPC1-7): B21D26/02

Foreign References:

JP2002035855A	2002-02-05
JP2002045924A	2002-02-12
JP2001321842A	2001-11-20
JP2000045767A	2000-02-15
JPS5147567A	1976-04-23
JP2003001336A	2003-01-07
JPH0939864A	1997-02-10
JPS5273168A	1977-06-18
JPS6137327A	1986-02-22
EP1022073A1	2000-07-26

Other References: