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

摘要

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.