APPARATUS AND METHOD FOR MANUFACTURING A LARGE-CALIBER PRODUCT USING HYDROFORMING

WIPO Patent Application WO/2012/102417

A1

The present invention relates to an apparatus and method for manufacturing using hydroforming, which can minimize the sealing force applied in the axial direction of a product when a large-caliber product is manufactured. The apparatus for manufacturing using hydroforming includes: upper and lower molds on which a tube-type steel material having a large inner caliber is seated; first and second axial punches disposed so as to be forwardly movable from both sides of the tube-type steel material, respectively, the first and second axial punches having front surfaces that are insertable into each other, respectively; first and second pressurization cylinders defining a sealed space, which is surrounded by the two axial punches, and a pressurizing space, which is surrounded by the inner surface of the tube-type steel material and the two axial punches, by forwardly moving the first and second axial punches such that the first and second axial punches are inserted into each other; and a hydroforming control part for supplying a fluid into the pressurizing space through an oil-pressure passage defined by at least one of the first and second axial punches so as to pressurize the inner surface of the tube-type steel material, thereby forming a large caliber product.

CHUNG GI SUK (KR)
CHOI HAN HO (KR)
OH JIN HO (KR)
KANG YEON SIK (KR)

PCT/KR2011/000486

August 02, 2012

January 24, 2011

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POSCO (KR)
CHUNG GI SUK (KR)
CHOI HAN HO (KR)
OH JIN HO (KR)
KANG YEON SIK (KR)

B21D26/033; B21D26/041; B21D26/045

JP2005262307A	2005-09-29
KR100815724B1	2008-03-20
KR20030034912A	2003-05-09
JPS5788919A	1982-06-03

See also references of EP 2669023A4

SHINSEGI PATENT LAW FIRM (KR)
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