Abstract: A stretch bending device that can conduct accurate bending without using heavy material. A tension application mechanism 62 comprises first and second drive sources for movably supporting both ends of a guide member 12 with respect to a pair of arm members 28, 30 and moving the guide member 12 along the arm members 28, 30. Between the arm members 28, 30, a work piece 6 is arranged. There are tension sensor 98 for detecting tension applied to the work piece 6 and position sensors for detecting positions of the guide member 12. Torque of the first drive source is controlled based on the tension detected by the tension sensor 98, and the second drive force is controlled based on the positions detected by the position sensors.

Abstract: There is disclosed a bending device, in which working data of feeding pitch between bending points, bending direction angle and bending angel is prepared from design data of a work, and a dividing point is determined to share the bending process by first and second joint type robots at one place of a straight line of the work able to be held by a chuck mechanism. After trial working, the working data is corrected. During the working, the first and second joint type robots having joints rotatable around axes parallel with the axial direction of the work are moved to the bending position. The work is held by a bending die and a clamping die rotatable around the bending die of a bending mechanism attached to the tip end of each joint type robot, and bent/worked by rotating the clamping die.

Abstract: There is disclosed a bending device, in which working data of feeding pitch between bending points, bending direction angle and bending angle is prepared from design data of a work, and a dividing point is determined to share the bending process by first and second joint type robots at one place of a straight line of the work able to be held by a chuck mechanism. After trial working, the working data is corrected. During the working, the first and second joint type robots having joints rotatable around axes parallel with the axial direction of the work are moved to the bending position. The work is held by a bending die and a clamping die rotatable around the bending die of a bending mechanism attached to the tip end of each joint type robot, and bent/worked by rotating the clamping die.

Abstract: There is disclosed a bending device, in which working data of feeding pitch between bending points, bending direction angle and bending angle is prepared from design data of a work, and a dividing point is determined to share the bending process by first and second joint type robots at one place of a straight line of the work able to be held by a chuck mechanism. After trial working, the working data is corrected. During the working, the first and second joint robots having joints rotatable around axes parallel with the axial direction of the work are moved to the bending position The work is held by a bending die and a clamping die rotatable around the bending die of a bending mechanism attached to the tip end of each joint type robot, and bent/worked by rotating the clamping die. When moving to the next moving position, each joint is rotated to change the attitude of the bending mechanism, and the bending mechanism is moved along the work while the work remains between the bending die and the clamping die.

Abstract: A bulging device and a bulging method for bulging a workpiece into an accurate shape, and preventing the generation of cracks therein. High pressure liquid is supplied to the interior space of a workpiece and from an external pressure supply mechanism to the outer space of the workpiece in cavity. An internal pressure detection sensor or an external pressure detection sensor is controlled according to the detected pressure, thereby controlling the pressure of the interior space of the workpiece or the pressure of the outer space of the workpiece in the cavity. Alternatively, position sensors for detecting displacement of pushing dies are provided such that the pressure of the interior space of the workpiece or the pressure of the outer space of the workpiece in the cavity is controlled according to the detected displacement.

Abstract: A bending device which can reduce a change in bend radius caused by movement of a bending jig and which can twist an elongate material using a simple construction. The bending device has a positioning jig 6 with a clearance opening formed therein for passing a material 1, positioning jig 6, for receiving the material, a bending jig 12 with a clearance opening for passing the material 1. The bending jig is supported on a sliding mechanism 26 movable in a plane perpendicular to a material supply direction controlled by a sliding drive mechanism 32. The device is also provided with a first bending mechanism 51 for pivoting the bending jig 12 around a first axis orthogonal to the length of the elongate material and a second bending mechanism 55 for pivoting the bending jig 12 around a second bending axis 52 orthogonal to the length of the material and the first bending axis to bend the material 1.

Abstract: There is proposed is a bending device which has a simple structure, easily performs a control and provides a high degree of freedom in bending. The bending device is provided with a positioning jig 6 with a clearance hole 4 formed therein for passing a material 1 to a bending jig 34 for contacting an outer periphery of the material supplied from the positioning jig 6. A rotary body 18 is rotated by a rotating drive source 22 coaxially with the material passed through the clearance hole 4 in the positioning jig 6. The bending jig 34 is attached to a member 30 pivotably supported by the rotary body 18, and pivoted by a cylinder 38, to bend the material 1.

Abstract: A hydraulic device provided with a plurality of hydraulic actuators directly connected to a hydraulic pump for control. A hydraulic pump is operable in both rotational directions when the electric motor is rotated forwards and in reverse. Ports of each hydraulic actuator are connected via a connecting line in parallel with ports of the hydraulic pump. A plurality of electromagnetic valves are provided in the connecting lines to the hydraulic actuators. By opening or closing each electromagnetic valve, the operation of the associated hydraulic actuator is controlled. The operation direction of each hydraulic actuator is controlled by rotating the electric motor clockwise or counterclockwise. Further, a position sensor is provided for detecting displacement of the specified hydraulic actuator and the electric motor is controlled based on a signal transmitted from the position sensor.