HYDROFORMING DIE ASSEMBLY AND METHOD FOR PINCH-FREE TUBE FORMING

摘要

PURPOSE: A method of hydroforming a metallic tube is provided and at least three separate die structures cooperable to define a die cavity into which a metallic tubular blank is provided. CONSTITUTION: A die assembly having die structures that are cooperable to define a die cavity into which a metallic tubular blank can be disposed. A first die structure is moveable to seal the die cavity, and after the die cavity is sealed, the first and second die structures are moveable to reduce the cross-sectional area of the die cavity and thereby deform the metallic tubular blank within the die cavity.