Patent ID: 6662613
Filing Date: 2003-12-16
Classification: B21D

Abstract:
A long member bending apparatus comprising:a bending head for bending a long member in a curved shape; a material supply unit for supplying the long member to the bending head; and a control system for controlling the bending head and the material supply unit, wherein the bending head comprises: a base plate having a guide pipe, through which a guide hole for passing the long member supplied from the material supply unit therethrough is formed, standing upright at the center thereof; a movable plate having a die, which applies a bending force to the long member supplied from the guide pipe forward while passing it therethrough, disposed at the center thereof; and six extendable units including hydraulic cylinders interposed between the base plate and the movable plate and universal joints disposed to both the ends of each hydraulic cylinder, wherein the six extendable units join the universal joints to the peripheral edge portions of the base plate and the movable plate so as to be formed in an approximate truss state and construct a parallel link mechanism for causing the movable plate to execute a motion having three degrees of freedom of translational movement and three degrees freedom of rotation with respect to xyz coordinates set on the base plate by expanding and contracting the hydraulic cylinders.