Abstract: The invention relates to a method for induction bend forming a compression-resistant pipe (I) having a large wall thickness and a large diameter. According to said method, in an initial phase t1, an initial tangent (3) of the pipe (I) is heat-treated by pushing the initial tangent (3) through the inductor (20) without the intervention of the bending lock (31). At the end of the initial tangent (3) the advance of the pipe is stopped at a time t2, and the inductor (20) is moved along the pipe (I) counter to the advance direction while the bending lock (31) is closed on the pipe (I). In order to induce the bending process in a phase t3, the movement speed of the inductor (20) is reduced to zero and the latter is moved to its bending position. At the same time, the advance of the pipe (I) is started. In a phase t4, a pipe bend (4) is produced at a constant process advance speed of the pipe (I).

Abstract: A method for induction bend forming of a compression-resistant pipe (1) having a large wall thickness and a large diameter, in particular, for use in power plants and pipelines, comprises: horizontal placement of the unprocessed pipe (1); feeding the pipe (1) to the passage of a front pipe section through an annular inductor (20) of an electrical induction unit; clamping the front pipe section in a bending lock (31) that is mounted on a bending arm (30), which is pivotable around a vertical axis of rotation (32) arranged laterally to the pipe; current supply to the induction unit for heating a pipe section; and deflecting the bending arm (30) by longitudinal feeding of the pipe (1) until the completion of the pipe bend (3). The pipe (1) is compressed vertically in a pressing unit (50) prior to introduction into the inductor (20), such that a cross-section of the pipe (1) is forced into the shape of a lying oval, and a temperature profile with a lower temperature at an outer side of the bend (3.

Abstract: The invention relates to a method for induction bend forming a compression-resistant pipe (I) having a large wall thickness and a large diameter. According to said method, in an initial phase t1, an initial tangent (3) of the pipe (I) is heat-treated by pushing the initial tangent (3) through the inductor (20) without the intervention of the bending lock (31). At the end of the initial tangent (3) the advance of the pipe is stopped at a time t2, and the inductor (20) is moved along the pipe (I) counter to the advance direction while the bending lock (31) is closed on the pipe (I). In order to induce the bending process in a phase t3, the movement speed of the inductor (20) is reduced to zero and the latter is moved to its bending position. At the same time, the advance of the pipe (I) is started. In a phase t4, a pipe bend (4) is produced at a constant process advance speed of the pipe (I).

Abstract: A pipe manipulator is configured to move a pipe in an apparatus for bending a pipe. The apparatus includes a feeding device, a heating device configured to annularly surround the pipe. at least one bending arm disposed axially downstream from the heating device in a pipe feed direction, and a bending lock disposed on the at least one bending arm and configured to grasp a pipe section to be bent and to move around a bending axis of rotation during a feeding of the pipe. The pipe manipulator includes a receiving sleeve axially displaceable in the pipe feed direction and disposed displaceably in the feeding device at an end of the pipe. The receiving sleeve is configured to reach into the pipe and to firmly clamp the pipe from an inside of the pipe and to guide the pipe in a defined manner axially through the heating device.

Abstract: A machine and method for bending tubes of large diameter in different bending directions, wherein a tube (10) is guided in the axial direction through an annular inductive heating device (7); the tube (10) is secured by a bending lock (4) at the end (11) thereof intended to be bent; at least one bending arm (2), which is mounted rotatably about a vertical axis of rotation (8), is located at the part of the bending machine that is disposed in the advancing direction of the tube (10); the bending lock (4) is indirectly connected to the bending arm (2); the bending lock (4) has a force transmission device between the receiving device for tubes and the bending arm (2); and the force transmission device is connected to the bending arm (2).

Abstract: A pipe manipulator is configured to move a pipe in an apparatus for bending a pipe. The apparatus includes a feeding device, a heating device configured to annularly surround the pipe. at least one bending arm disposed axially downstream from the heating device in a pipe feed direction, and a bending lock disposed on the at least one bending arm and configured to grasp a pipe section to be bent and to move around a bending axis of rotation during a feeding of the pipe. The pipe manipulator includes a receiving sleeve axially displaceable in the pipe feed direction and disposed displaceably in the feeding device at an end of the pipe. The receiving sleeve is configured to reach into the pipe and to firmly clamp the pipe from an inside of the pipe and to guide the pipe in a defined manner axially through the heating device.

Abstract: A device for bending a pipe includes a pipe feed device configured to continuously advance the pipe in a longitudinal direction of the pipe feed device; a bending arm pivotable about a rotation axis and having a pipe holding device securable on the bending arm in a first fixing position and in a second fixing position, the first fixing position disposed on the other side of a centre axis of the bending arm from the second fixing position, the pipe holding device configured to detachably secure the pipe, wherein the feed device and the bending arm are movable relative to one another such that the feed device and the rotation axis can be moved past one another; and a heating device disposed in a pipe feed direction and configured to heat an area of the pipe.

Abstract: The invention relates to a closing unit for tools to be pressed together against opening forces having two tool carriers which can be displaced towards one another. In accordance with the invention, there are two jaws engaging over the tool carrier plates at the side in each case in a closed position while building up a bias. The closing unit is advantageously designed in the form of bias modules for tools.

Abstract: The invention relates to a closing unit for tools to be pressed together against opening forces having two tool carriers which can be displaced towards one another. In accordance with the invention, there are two jaws engaging over the tool carrier plates at the side in each case in a closed position while building up a bias. The closing unit is advantageously designed in the form of bias modules for tools.

Abstract: A process for producing a hollow body provided with a transverse branch, in a forming tool from a tubular metal section, which process uses an internal high pressure forming technique. The process provides for the crown of the branch to be punched out by a platen (which supports the branch during its formation), at an internal pressure which is higher than the maximum production internal pressure (Pilmax). The end face of the platen at its head end is for this purpose of a larger dimension than the active supporting face and has a cutting edge which peripherally surrounds the active supporting face, in the manner of a collar.

Abstract: To produce an elongate hollow metal body with a cross-sectional contour varying in the longitudinal direction by the internal high-pressure forming process in an internal high-pressure forming press, a sheet-metal blank composed of two blank parts of identical area is first produced, each part having, apart from additional joining-area parts provided in the region of the longitudinal edges, in the longitudinal direction at least the length of the longitudinal hollow body and in the transverse direction at most half the length of the respective cross-sectional contour. Subsequently, the two blank parts are laid one on top of the other and are joined together, in particular welded, in the region of the joining-area parts. Thereafter, the sheet-metal blank is expanded by introducing a pressure medium between the two blank parts held within a tool consisting of two dies.