Patent ID: 8650922
Filing Date: 2014-02-18
Classification: B21D

Abstract:
1. A pipe bending machine which feeds a pipe to a gap between a support roller and a bending roller, and successively performs bending operations with bend diameters greater than a diameter of the support roller while changing a position of a center of the support roller in synchronization with a turning angle of the bending roller, the pipe bending machine comprising: an XY slide mechanism being placed on a frame and including, a turntable device being placed on the XY slide mechanism, the turntable device having a turntable on an upper side and configured to rotate the turntable, by rotation of a C2-axis servomotor; a central shaft fixed to the turntable; the support roller supported by an upper end portion of the central shaft; a cylindrical shaft placed on the turntable and rotatably supported by the central shaft; the bending roller arranged on an upper end face of the cylindrical shaft; and a bending device configured to rotate the cylindrical shaft around the central shaft by rotation of a C1-axis servomotor; wherein the XY slide mechanism is configured to bend the pipe by moving the center of the support roller by a first predetermined angle along a semicircular arc having a diameter equal to a difference between each of the bend diameters of the pipe and the diameter of the support roller, rotating the support roller by the first predetermined angle, turning the bending roller by the first predetermined angle around the support roller, and further turning the bending roller by a second predetermined angle around the support roller by rotating the cylindrical shaft by rotation of the C1-axis servomotor, the rotating of the support roller by the first predetermined angle and the turning of the bending roller by the first predetermined angle are realized by rotating the turntable by rotation of the C2-axis servomotor in synchronization with the movement of the center, and the turning of the bending roller by the second predetermined angle is realized by rotating the cylindrical shaft by rotation of the C1-axis servomotor.