Abstract: The pipe bending machine comprises a bending template (15) for bending the pipe therearound. The unbent pipe portion is supported on a pipe supporting rail (20) mounted on a pipe supporting rail carrier (25) and being adjustable in height. The height adjustment of the pipe supporting rail (20) is performed by a drive means (28), suited for stepless positioning, which sets the pipe supporting rail (20) to a height predetermined by the CNC control unit. Prior to the bending of the pipe, the height to which the pipe supporting rail (20) is to be moved is determined by the working program in dependance on a set of tool data which has been input into the control unit.

Abstract: For the advance of the slide rail of a pipe bending machine, a hydraulic cylinder (22) is provided. The pressures (P1,P2) on both sides of the piston (23) of the cylinder (22) are detected, and from these pressures, the actual value of the advance force (F) is calculated. A set value generator (49) generates the set value (Fs) of the advance force in dependence on the respective rotational angle (.alpha.) of the bending template. A controller (48) controls a throttle valve (42) such that the actual value (Fi) follows the set value (Fs). Thus, a power control of the slide rail advance is effected.

Abstract: A bending machine for elongate workpieces, particularly a pipe bending machine, comprises a clamping jaw (18) for clamping the workpiece (14) to be bent. During the bending process, this clamping jaw (18) is advanced by a hydraulic piston-cylinder unit (24), the advance force being controlled to a predetermined value. In this manner, the workpiece (14) is subjected to a pressure bending process of high quality.

Abstract: The pipe-bending machine comprises two bending heads (11,12) being configured so as to be mirror-inverted with respect to each other and projecting in cantilever-like manner from a machine frame (10). A cross slide (26) supporting the pipe holding device (25) is displaceable on the machine frame (10). The first bending of the pipe (17) is performed in a first bending head (12). Then, the pipe holding device (29) is displaced to the second bending head (11) where the second bending operation is performed. Thus, several bending operations can be effected successively without there being a need to reclamp the pipe.

Abstract: The pipe bending machine comprises a rotatable bending template (14) and a pivot arm (21) pivotable about the axis of the bending template and supporting a clamping jaw (22). In order to be able to perform rightward bending as well as leftward bendings of a pipe (27), the bending template (14) consists of two template parts (15,16) configured for different bending directions. The clamping jaw (22) also consists of jaw parts (23,24) for different bending directions. On both sides of the bending head, slide rails (32,33) are arranged.

Abstract: A pipe bending machine has a bending template (10) around which a pipe (13) is bent. The bending template (10) is provided with a position sensor (32) that detects the bending path in dependence on the rotational position. A pushing device (17) engages the unbent portion (13a) of the pipe and urges the same towards said bending template (10). The pushing device (17) is provided with a position sensor (30). The position signals (PS1, PS2) of the two position sensors (32, 30) are compared in a control circuit (41) and an actuation signal (SS) is generated for controlling a pressure controller (42) to adjust the pressure of the drive (22) of the pushing device (17). The actuation signal (SS) is generated such that, in the case of equal position signals (PS1, PS2), the drive (22) of the pushing device (17) is supplied with a pressure that determines the upsetting force exerted on the pipe.

Abstract: A pipe bending machine having a support, a bending template, a clamping jaw displaceable relative to the bending template, a clamping member for a pipe, and clamping bodies each provided in a respective one of the bending templates and the clamping jaw and movable relative to one another to an operative position, one of the clamping bodies havign a clamping surface which is provided with different contours for portions of a pipe to be clamped, while the other of the clamping bodies being provided with a clamping surface having only one contour corresponding to the portion of the pipe to be clamped so that the portion of the pipe to be clamped is engaged over its whole surface at the respective side over an angular distance of 180.degree..

Abstract: A method of producing a marking on a pipe for identifying a location of an object to be mounted on the pipe includes forming the marking by a pipe bending machine in which the pipe is bent. For this purpose the pipe bending machine is provided with a marking device.

Abstract: In a tube bending machine including a bending template having a groove receiving a tube portion to be bent and a clamping jaw cooperating with the bending template to bend the tube portion, the template and the clamping jaw each includes a clamping element with interchangeable clamping faces. Each clamping element has a hydraulic drive incorporated in the template and the clamping jaw, respectively.

Abstract: A pipe bending machine comprises a longitudinally extending machine frame having an upper side, a feeding carriage movable at an upper side of the machine frame and carrying device for clamping a pipe, a bending head provided on one end of the machine frame and rotatable about a vertical axis, a bending template mounted on the bending head and formed as a multi-level template having a plurality of bending grooves provided with different bending diameters and arranged at different levels, a device cooperating with the bending template for bending a pipe therebetween, the bending template and the displacing carriage with the clamping sleeve being movable relative to one another in a vertical direction and transversely to a longitudinal direction of the machine frame for using one or another of the bending grooves, the bending template being liftable and lowerable in the vertical direction for exchanging the bending grooves, while the feeding carriage being moved transversely in the longitudinal direction of the

Abstract: A method of producing a marking on a pipe for identifying a location of an object to be mounted on the pipe includes forming the marking by a pipe bending machine in which the pipe is bent. For this purpose the pipe bending machine is provided with a marking device.

Abstract: A tube bending machine comprises a bending table carrying a bending template and a clamping jaw for receiving a tube to be bent therebetween. The template and the clamping jaw are each formed with a recess to receive various clamping members. Each clamping member is movable into and away from the recess in the template or the clamping jaw so that different clamping members having different clamping surfaces are positioned against each other to clamp a tube being bent.

Abstract: Disclosed is a pipe bending machine which for the purpose of increasing the freedom of bending operation, is provided with a stand which supports longitudinally extending flat supporting beam of a relatively low height. The forwardly projecting part of the supporting beam has a lateral extension supporting for rotation the bending table whose center axis of rotation is laterally offset relative to the side wall of the supporting beam. The bending table has a rotation symmetrical configuration and consists of an inner rotary sleeve which acts simultaneously as a cylinder for lifting a two piece bending die. The drive for the bending table, and the drives for sliding shoe cooperating with the bending die are arranged on the projecting part of the supporting beam in a single structural unit.

Abstract: A pipe bending machine has a travelling carriage, a bending template, a bending mandrel arranged in a pipe to be bent near the bending template and having a mandrel rod, a cylinder-piston unit for withdrawing the mandrel, and a measuring device associated with the mandrel rod and arranged to actuate in the event of overloading of the mandrel rod a switch element so as to stop or eliminate the overloading of the mandrel or the mandrel rod.

Abstract: There is disclosed a pipe bending machine comprising a movable clamping unit for holding a pipe to be bent and feeding the pipe along a feed path. A slidable guide rail extends in the longitudinal direction of the feed path to guide the pipe. Bending of the pipe is carried out at a pivotable bending table, which carries a template provided, at two opposite sides thereof and in a single plane, with two curved bending surfaces of different radii. Clamping devices are present for clamping the pipe to either one of the surfaces. A displacing device is provided to displace the template in a horizontal plane and relative to the guide rail to compensate for any eccentricity of the center of curvature of either or each of the surfaces with respect to the pivot axis.

Abstract: A pipe-bending machine has a bending table rotatable about an axis of rotation, a bending form having two opposite curved sections each defining a center of curvature, an oblong hole connecting the two centers of curvature, a retaining bolt coaxial with the axis of rotation of the table and projecting above the upper surface of the latter to engage the oblong hole, and means for shifting the bending form from one working position in which one center of curvature coincides with the axis of rotation of the table into another working position in which the other center of curvature coincides with the axis of rotation, and means for arresting the bending form in its selected working position.

Abstract: A tube feeding device, particularly for use in a bending machine, comprises two units spaced from one another at a predetermined distance to form a tube magazine therebetween. A carriage with a recess to receive one individual tube is positioned at the bottom of the tube magazine. A chain conveyor is provided in the device adapted to receive individual tubes from the recess and transport the tubes toward the bending machine. The carriage is adapted to move towards and away from the chain conveyor to deliver the individual tube to the conveyor which is provided with a plurality of grippers adapted to carry the tubes and to advance them in a vertical direction.

Abstract: A pipe bending machine has a pipe bending mechanism which receives lengths of pipe to be bent from a pipe magazine located laterally of one side of the mechanism. A pipe transfer device is interposed between the bending mechanism and the magazine and transports pipe length from the magazine to the bending mechanism, for which purpose it is so constructed that it can pivot in a plurality of mutually inclined planes.

Abstract: An arrangement for positioning a workpiece having a portion to be located in a predetermined orientation relative to a work station, includes a device for displacing a workpiece so that the above-mentioned portion thereof moves along a predetermined trajectory. A sensing device shuts down the displacing device when the above-mentioned portion of the workpiece is in a desired predetermined orientation relative to a work station.

Abstract: A tube bending machine comprises a bending table mounted on a support turnable about an axis and coaxially carrying an inner bending template surrounded by at least one outer bending template which is shiftable along said axis relative to the inner bending template so that a portion of the tube to be bent may be pressed by clamping means carried by the bending template against the outer surface of the inner or the outer bending template. The bending machine comprises further guide means including a releasable collet for guiding the tube toward the bending templates, the guide means being mounted on the support movable in longitudinal direction of the tube to be bent and in a direction transverse to the longitudinal direction.