Push-through bending method and bending device by this method

TLDR: In this paper, the authors propose to bend a tube with an arbitrary bend radius by pushing through in the state that the central axis of a guide cylinder and the center of the bearing part of die are shifted and using the die of bearing part with the sectional shape of tube.

Abstract: PURPOSE:To enable bending with an arbitrary bend radius by bending tube, etc. by pushing through in the state that the central axis of a guide cylinder and the center of the bearing part of die are shifted and using the die of bearing part with the sectional shape of tube. CONSTITUTION:In the state that the center axis of the guide cylinder 2 and the center of the bearing part 3a of the die 3 are relatively shifted, that is, the state that a offset (u) is provided, bending is executed by pushing the pipe through the guide cylinder 2 and the die 3. By using only one die with the bearing part which is formed corresponding to the cross sectional shape of tube, etc., continuous bending with the arbitrary bend radius is possible only by controlling the offset. The highly exact position control becomes possible, because securing the offset is enough only by the straight movement of the die or guide cylinder. And the deformation of sectional shape is restrained by performing bending while the outer peripheral part of tube, etc. is constrained with the die and compressive force is loaded. Thereby, the exact bending corresponding to the specifications can be realized.