The invention relates to a method for induction bend forming a compression-resistant pipe (1) 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 (1) 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 (1) counter to the advance direction while the bending lock (31) is closed on the pipe (1). 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 (1) is started. In a phase t4, a pipe bend (4) is produced at a constant process advance speed of the pipe (1). In a phase t5, the advance speed of the pipe (1) is reduced and the inductor (20) is accelerated counter to the advance direction while the bending lock (31) is opened. In a phase t6, a final tangent (5) is heated by further advancing the inductor in the opposite direction.
B21D 7/04 - Bending rods, profiles, or tubes over a movably-arranged forming member
B21D 7/16 - Auxiliary equipment, e.g. for heating or cooling of bends
B21D 43/00 - Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profilesAssociations therewith of cutting devices
2.
METHOD FOR INDUCTION BEND FORMING A COMPRESSION-RESISTANT PIPE HAVING A LARGE WALL THICKNESS AND A LARGE DIAMETER ,AND INDUCTION PIPE BENDING DEVICE
For induction bend forming a compression-resistant pipe (1) having a large wall thickness and a large diameter, the pipe (1) is vertically compressed in a press unit (50) before it is introduced into an annular inductor to heat it and a cross-section in the shape of a lying oval is imposed onto the pipe (1) in said press unit. In addition, at least during an interval of the pipe bending process a temperature profile with a lower temperature on an outer surface of the bend and a higher temperature on an inner surface of the bend is set by means of a transverse displacement of the inductor relative to the pipe (1).
B21D 7/025 - Bending rods, profiles, or tubes over a stationary forming memberBending rods, profiles, or tubes by use of a swinging forming member or abutment by a swinging forming member and pulling or pushing the ends of the work
B21D 7/16 - Auxiliary equipment, e.g. for heating or cooling of bends
3.
BENDING MACHINE FOR CREATING BENDS TO THE LEFT AND RIGHT
A machine for bending tubes of large diameter in different bending directions, wherein, for bending, in this machine a tube (10) is guided in the axial direction through an inductive heating device (7) enclosing this tube in an annular manner, 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), the force transmission device is connected to the bending arm (2) such that it can be set so as to allow the distances between the centre axis of the receiving device for tubes and the vertical axis of rotation (8) to be chosen between the smallest distance and greatest distance, whereby a range between a greatest and a smallest bending radius (12) can be set, the machine has at least one further bending lock (5) with a further bending arm (3), a receiving device for tubes and a force transmission device for bending forces from the receiving device to the further bending arm (3), wherein the direction of rotation of the further bending arm (3) is opposed to the direction of rotation of the first bending arm (2), and each of the two bending arms (2, 3) can be moved parallel to one another and perpendicular to the advancing direction of the tubes to be bent.
B21D 7/025 - Bending rods, profiles, or tubes over a stationary forming memberBending rods, profiles, or tubes by use of a swinging forming member or abutment by a swinging forming member and pulling or pushing the ends of the work
B21D 7/16 - Auxiliary equipment, e.g. for heating or cooling of bends
B21D 11/07 - Making serpentine-shaped articles by bending essentially in one plane
The invention relates to a pipe manipulator for loading and unloading pipes, for use in a device for bending pipes of large diameters, wherein in said device for bending pipes, a pipe is guided in the axial direction through an inductively operating heating device that annularly encloses said pipe, a receiving sleeve that can be moved axially in the advancing direction of the pipe is provided at the end of the pipe, said receiving sleeve being rigidly connected to the device for bending pipes, the receiving sleeve reaches into the pipe from the inside and clamps the pipe in place from inside, the receiving sleeve applies the axial force by means of which the pipe is pushed through the inductively operating heating device, the receiving sleeve guides the pipe axially through the inductively operating heating device in a defined manner until the rear end is fixed in the front gripping element on the bending arm.
B21D 7/16 - Auxiliary equipment, e.g. for heating or cooling of bends
B21D 43/00 - Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profilesAssociations therewith of cutting devices
The invention relates to a device and method for bending pipes, said device comprising a feed device (4) for the pipe (2), which feeds the pipe (2) continuously in the longitudinal direction, a heating device (5) located in the feed direction for heating one region of the pipe (2) and a bending arm (7), which can be pivoted about a rotational axis (D) and comprises a holding device (6) for the pipe (2). The pipe (2) can be removably fixed in the holding device (6). The aim of the invention is to provide a device and a method for bending pipes with which the pipe can be bent in different bending directions. To achieve this, the feed device (4) and the bending arm (7) can moved in relation to one another in such a way that the feed device (4) and the rotational axis (D) of the bending arm (7) can be moved past one another.
B21D 7/02 - Bending rods, profiles, or tubes over a stationary forming memberBending rods, profiles, or tubes by use of a swinging forming member or abutment
B21D 7/16 - Auxiliary equipment, e.g. for heating or cooling of bends
6.
METHOD AND DEVICE FOR PRODUCING A CUTOUT OR APERTURE IN THE WALL OF A COMPONENT FORMED ACCORDING TO THE HYDROFORMING PROCESS
The invention relates to a method of producing a cutout or aperture in the wall of a component formed according to the hydroforming process, for example a hollow body which is located in the forming tool (1), by means of a punch (8, 10) which is displaceable from outside to inside or from inside to outside and which is pressed into the wall of the hollow body. In order to carry out a cutting process in the tool, it is proposed that the wall of the initial workpiece or workpiece mounted in the forming tool (1) and fixed and positioned preferably with sealing plungers (3, 4) first of all be precut abruptly by means of the punch (8, 10) except for a residual wall thickness. The forming process is combined with processes of chipless forming for processing the apertures and cutouts and with finishing, which take place in the tool. Furthermore, a corresponding device is proposed.
patents