EP2691195B1 - Bending head for bending rod- and pipe-shaped workpieces - Google Patents

Description

The invention relates to a bending head for bending rod and tubular workpieces, with a rotatable about an axis holder which carries a bending mandrel at one axial end, and with at least two other tools, each having a holding body with the bending mandrel facing the axial End include a bending pin and each of which, in each case independently of the other tools, is rotatable.

From the EP 1 591 174 B1 a bending head for a bending device for rod and tubular workpieces is known, in which the workpiece is clamped between a central bending mandrel and a relative thereto movable clamping device and bent by pivoting the bending mandrel and the clamping device with clamped workpiece. This known bending head operates with a plurality of axes of rotation, one of which serves to rotate the bending mandrel, while another is associated with the pivoting of the clamping device. Another axis of rotation is intended to cause a clamping movement by radially advancing the clamping device against the workpiece (or back). Although this known bending machine can be a bending of the workpiece in two opposite bending directions without changing the bending head, but is very complicated and not very flexible when using a once mounted bending mandrel, with complex components can not be produced.

From the WO 2007/122346 A1 a bending machine for rod and tubular workpieces is known which has a bending head with a circular disc, which carries in its center a bending mandrel and is pivotable about a central bending axis. Further, a jaw is provided which is rotatably mounted about a second axis on the circumference of a turntable, which in turn can be rotated about an axis parallel to the central axis of bending and mounted at a distance from this axis on the circular disc. With this known bending head bending of tubular workpieces with very thin wall thicknesses in two bending directions can be carried out without great effort, but even here the bending of very complex bent parts is not possible.

A bending head of the type mentioned above describes the WO 2010/080522 A2 , This known bending head can work with two or more tools, which are mounted on a turntable on the center of a bending mandrel mounted around it and at a distance from it and formed independently rotatable by their own rotary actuators. This known bending head also allows the production of complicated bending forms, but is very complex in its overall structure at the same time a very large space requirement.

Proceeding from this, the invention aims to develop such a known bending head such that it has a significantly reduced space requirements and a less expensive construction while maintaining its suitability for producing very complex bent parts.

For this purpose, the invention proposes a bending head of the type mentioned, in which the holding body of the tools are arranged concentrically to the holder of the bending mandrel and pivotable about its axis of rotation.

Most preferably, the holding body of the tools are designed as concentric with each other in running hollow shafts, sitting in the radially innermost of the holder of the bending mandrel rotatable.

The inventively provided concentric nesting of the holding body of all tools and the mandrel leads to a telescopic overall arrangement with minimal space requirements, which is further favored by the fact that each tool consists of a holding body with a projecting at the radial end surface bending pin. Since its diameter is usually not very large, and the wall thickness of the holding body to which the bending pin is attached, in the radial direction can also be made relatively small, so that a total in conjunction with the concentric arrangement of the holding body and the mandrel a very considerably smaller space requirement for the bending head according to the invention than in the generic bending head.

Characterized in that the holding body of the individual tools and the holder of the bending mandrel, in each case independently, are rotatable, can be rotated independently during operation of the mandrel and the bending pins, wherein for each of these elements twisting in both directions of rotation is possible. If only two tools are present in the bending head according to the invention in addition to the bending mandrel, each of these can have an extraordinary effect due to these three concentrically arranged individual elements taking into account the two possible directions of rotation large variety of different constellations of mandrel and bending pins are achieved with each other, which is given a remarkably large flexibility. At the same time, the production of very complex bent parts is possible.

If, in a bending head according to the invention, the holding bodies of the tools are designed as concentrically intermeshing hollow shafts in whose radially innermost the holder of the bending mandrel is rotatably seated, a very small space requirement of the bending head according to the invention is achieved without any restriction of its flexibility.

An advantageous embodiment of the bending head according to the invention also consists in that the bending mandrel and / or the bending pins between an active operative position in which they act during bending on the workpiece to be bent, and a non-active rest position parallel to the axis of rotation of the mandrel are adjustable. This ensures that parts of the bending head in addition to the rotational movements that they can perform, are also lowered, which means that the tool rims (single or multiple, independent or shared) or the mandrel lowered below the bending plane and z. B. can be raised again on the other side of an inserted workpiece. Similarly, it is thereby also possible, in the execution of a very specific bending process, a bending pin, which is not required for this bending operation, move out by lowering its holding body from the bending plane, so that it can not interfere with the subsequent bending operation.

In a further advantageous embodiment of the invention can also be provided that is mounted on at least one bending pin to a freely rotatable bending roller, so that what is desirable especially for larger diameters of the workpieces to be deformed, the bending process can be carried out as part of a roll bending ,

It is further preferred if, in a bending head according to the invention, the holding body of the tool with the radially outermost bending pin is rotatably mounted on an upper end wall of a housing and is in driving connection with a first rotary drive mounted on this housing, in particular on its upper end wall. In this case, the holding body of the tool with the radially outermost bending pin preferably has an outer toothing, preferably in the vicinity of the upper surface of the end wall of the housing, which is in meshing engagement with a gear connected to the first rotary drive, wherein, again preferred, the first rotary drive on the side facing away from the bending pins of the tools of the upper end wall of the housing is attached thereto. At this Embodiment is thus driven by the rotary drive drive gear for the holding body of the tool with the radially outermost bending pin, which meshes with an external toothing of this holding body, mounted on the outside of the housing (over the upper end wall), while driving it first rotary drive inside, Thus, on the other side of the upper end wall, arranged and preferably attached to this, wherein the output shaft of this first rotary drive is passed through the upper housing wall to drive the drive gear. This also causes a relatively small footprint of a thus equipped bending head.

A particularly great flexibility of the bending head according to the invention can be achieved in that the holder for the mandrel as well as the holding body for the other tools are each connected to its own rotary drive, so that a complete independence of their movements can be reached.

It is also advantageous if the first rotary drive is connected to a first lifting device, which is designed for stationary mounting on a machine frame of a bending device and, after being mounted there, allows a process of the entire bending head with all its associated facilities parallel to the bending axis ,

Advantageously, in a bending head according to the invention, the holding body of each tool is connected to a device by means of which it can be moved from a non-active rest position to an active operative position (and vice versa), which means moving out of the bending plane or driving it into each of them used tools allows.

It is particularly advisable in the invention further, when the bending mandrel are mounted replaceably on its holder and the tools on their holding bodies, so that also a rapid replacement of the mandrel and / or the bending pins on the tools without great difficulty and with only a small machine downtime can perform.

An advantageous embodiment of the invention also results when the holder of the bending mandrel is connected at its axial end opposite the bending mandrel to a second rotary drive which is attached to a first plate, which in turn by means of a second lifting drive together with the second rotary drive and the holder for the bending mandrel in the direction of the axis of rotation of the latter is movable.

A preferred embodiment of the bending mandrel according to the invention also consists in that the first lifting drive comprises a spindle shaft on the output side, on which a spindle nut attached to the first plate is mounted, wherein the spindle shaft with its axially projecting end portion in a second distance from the first plate by a second Plate rotatable, but stationary in the axial direction of the spindle shaft, is mounted, and the second plate the bending mandrel surrounding the holding body of the tool for the radially innermost bending pin at its end facing away from the bending mandrel rotatable opposite her, but fixed fixed in the direction of the axis of rotation bears. This embodiment makes it possible to move the holder for the radially innermost bending pin relative to the mandrel and the holder of the latter in the longitudinal direction of the axis of rotation of the mandrel, thus in particular the bending pin while maintaining the bending mandrel in the bending plane or the mandrel while maintaining the innermost bending pin lower in the bending plane.

For this purpose, the second lifting drive preferably comprises on the output side a spindle shaft on which a spindle nut attached to the first plate is seated, wherein the spindle shaft is rotatably mounted with its axially projecting end portion in a second plate spaced a distance from the first plate but stationary in the axial direction of the spindle shaft is and the second plate surrounding the bending mandrel holding body of the tool for the radially innermost bending pin at its end facing away from the bending mandrel axially opposite her rotatable, but held stationary in the direction of the axis of rotation bears. This could, with otherwise identical configuration, the spindle shaft of the second lifting drive with its axially projecting end portion but instead of rotatably mounted on the second plate on the housing, but be fixed in its axial direction, which is achievable that then an independent adjustment of the first and second Plate is possible.

Advantageously, the second plate also carries a third rotary drive, by means of which the holder for the radially innermost bending pin can be driven in the direction of rotation. This makes it possible to mount the drive for the holder for the radially innermost bending pin in a particularly space-saving manner within the overall device.

Preferably, a third lifting drive is provided, by means of which the second plate is longitudinally displaceable in the direction of the axis of rotation of the bending mandrel.

It is also advantageous if in the invention, all rotary and lifting drives are covered by a downwardly open housing, protruding on the upper end wall of the bending head to the outside.

In this case, the third lifting drive is preferably provided on the output side with a spindle shaft, on which a spindle nut connected to the second plate is seated, wherein the spindle shaft is rotatably mounted at its axially projecting end, but fixed in the axial direction of the spindle shaft to the upper end wall of the housing. In this embodiment, in a again very space-saving manner directed towards the axis of rotation of the bending mandrel Relatiwerschiebung between the holder for the radially inner bending pin and for the radially outer bending pin (in addition to the bending mandrel in two tools) can be achieved.

In the bending head according to the invention, the bending mandrel may be formed in any suitable manner, but is preferably a multi-radius tool or a four-pin tool.

Fig. 1

eine perspektivische Prinzipdarstellung einer Biegevorrichtung mit einem erfindungsgemäßen Biegekopf;

Fig. 2

eine vergrößerte Darstellung des Biegebereiches mit dem erfindungsgemäßen Biegekopf bei der Biegevorrichtung gemäß Fig. 1;

Fig.3

eine schematische, teils geschnittene, Darstellung eines erfindungsgemäßen Biegekopfes mit allen Hub- und Dreheinrichtungen im Falle eines Biegedornes mit zwei weiteren Werkzeugen, wobei hier der Biegdorn und die Biegestifte gemeinsam in einer Biegeebene liegen;

Fig. 4

die Darstellung aus Fig. 2, jedoch mit aus der Biegeebene nach unten abgesenktem Biegedorn;

Fig. 5

den Biegekopf aus Fig. 3, jedoch mit Absenkung des Biegedornes und des inneren Biegestiftes aus der Biegeebene;

Fig. 6

die Darstellung aus Fig. 5, jedoch mit einem wieder angehobenen Biegedorn, der weiter als in Fig. 3 ausgefahren ist, wodurch in der unteren Ebene des Biegedornes gearbeitet werden kann, und mit einem abgesenkten inneren Biegestift, sowie

die Fig. 7-13

zeigen jeweils prinzipielle Draufsichten auf einen erfindungsgemäßen Biegekopf bei der Herstellung unterschiedlich komplexer Biegeteile.

The invention will now be explained in more detail by way of example with reference to the drawings in principle. Show it:

Fig. 1

a perspective schematic representation of a bending device with a bending head according to the invention;

Fig. 2

an enlarged view of the bending region with the bending head according to the invention in the bending device according to Fig. 1 ;

Figure 3

a schematic, partially cut, representation of a bending head according to the invention with all lifting and rotating devices in the case of a bending mandrel with two other tools, in which case the bending mandrel and the bending pins are together in a bending plane;

Fig. 4

the presentation Fig. 2 but with bending mandrel lowered downwards from the bending plane;

Fig. 5

the bending head off Fig. 3 , but with lowering of the bending mandrel and the inner bending pin from the bending plane;

Fig. 6

the presentation Fig. 5 but with a raised mandrel going further than in Fig. 3 is extended, which can be worked in the lower level of the bending mandrel, and with a lowered inner bending pin, as well

Figs. 7-13

show in each case schematic plan views of a bending head according to the invention in the production of different complex bending parts.

In the following description, the same parts in the different figures are also provided with the same reference numerals throughout.

Fig. 1 shows in an oblique view quite principally a bending machine 1 for processing rod or tubular workpieces 2, which includes a feed and straightening unit 3 and a bending unit 4, which is mounted in the feed direction after the feed and straightening unit 3.

The bending unit 4 comprises a bending head 5, which is mounted within a recess 6 in a bending table 7.

The workpiece 2 is initially conveyed in the direction of arrow A by the feed and straightening unit 3 to a guide device 8 upstream of the bending head 5 in which a cutting device 9 (FIG. Fig. 1 and 2 ) is provided.

Bending table 7 and feed and straightening unit 3 sit on a base 10. In this case, the bending table 7 is arranged obliquely to the floor to allow slipping of the workpiece 2 after processing. In Fig. 1 However, no means for receiving the slipping, machined workpieces 2 is shown.

The in Fig. 2 in a detail enlargement Fig. 1 shown bending head 5 has a centrally disposed bending mandrel 11 which is executed in the embodiment shown as a two-prong tool and at its upper radial end face comprises two mutually 180 ° diagonally offset bending pins 13, 14. The bending pin 13 has a larger diameter than the bending pin 14, so that both bending pins 13, 14 provide two different bending radii available. The two bending pins 13, 14 form together with a mold base 15 a forming mandrel as a bending mandrel 11, wherein the mold base 15 also forms on its outer peripheral surface two diametrically opposite peripheral surfaces, which in turn have two further bending radii. During the bending process can be the workpiece 2 either, as from Fig. 2 can be bent in the upper region of the mandrel 11 by the action of the bending pins 13, 14 or in an underlying plane to the two bending surfaces of the mold base 15 of the bending mandrel 11. Depending on which of the two bending planes, the workpiece 2 is to be bent straight, the bending mandrel 11, parallel in the direction of its axis of rotation 12, shifted so that either the two bending pins 13, 14 or the mold base 15 are in the bending plane.

The bending mandrel 11 is seated on the upper axial end surface 16 of a cylindrical holder 17, as shown in FIGS Fig. 3 to 6 can be seen, each illustrating a schematic, partially sectioned view of such a bending head 5.

The central cylindrical holder 17 of the mandrel 11 sits in turn, like the Fig. 2 to 6 show, rotatable within a trained as a hollow shaft bracket 18, the at her upper, the bending mandrel 11 associated axial end surface 19 carries an axially projecting from this bending pin 20 (see. Fig. 2 and 3 ).

The holder 18, which forms a tool with the bending pin 20, sits in turn, turn rotatable, within an outer holder 21 which, as Fig. 3 shows, also designed as a hollow shaft.

The radially outer bracket 21 formed on the bending head 5 forms at its overhead region a radially recessed portion 22 in which the holder 18 is rotatably mounted and at the axial upper end surface 23 in turn an axially projecting bending pin 24 is mounted.

At the in Fig. 2 As shown, the surface of the mold base 15, from which the bending pins 13 and 14 project, and the axial end surfaces 19 of the holder 18 and 23 of the holder 21 in a continuous plane, wherein the bending of the workpiece 2 in this bending plane and thus, with respect to the bending mandrel 11, is made in the upper bending plane in the interaction of the bending pins 13 and 14.

The special orientation of the bending head 5 from Fig. 2 is also in Fig. 3 shown.

Reference is now made to the illustrations of Fig. 3 to 6 in which the concentric arrangement of the outer holder 21, the middle holder 18 and the inner cylindrical holder 17 is shown for the bending mandrel 11, wherein the drawings of the Fig. 3 to 6 expressly referred to as essential.

The outer holder 21, which carries the radially outer bending pin 24 is mounted on the upper end wall 25 of a downwardly open housing 26, in such a way that it is rotatable relative to this, but immovably mounted in the direction of the axis of rotation 12.

At its lower, directly above the upper end wall 25 of the housing 26 lying portion 21 is the holder with a in the Fig. 3 to 6 not shown external teeth 27 provided with a in the Fig. 3 to 6 also shown only schematically gear 28 is engaged.

The gear 28 is driven by a on the opposite side of the end wall 25 attached to this first rotary drive 29, with which the gear 28 is connected through the end wall 25 therethrough.

The first rotary drive 29 is connected by means of a spindle nut 30 attached to it with a rotary spindle 31, which in turn is fixed at its lower end on a stationary machine housing, such as the base 10 of the bending table 7. By the first lifting drive 32, the first rotary drive 29 can be moved together with the housing 26 and the bracket 21 attached thereto and thus also the entire bending head parallel to the axis of rotation 12 upon rotation of the rotary spindle 31.

As the Fig. 3 to 6 show further, the cylindrical holder 17 is connected to the bending mandrel 11 at its opposite axial (lower) end of the latter with a second rotary drive 33, which in turn is attached to its holder 17 facing the axial end to a first plate 34.

To the first plate 34, a spindle nut 35 is further connected, which is in engagement with a rotary spindle 36, which in turn is driven by a second lifting drive 37.

At its axial end opposite the second lifting drive 37, the rotary spindle 36 is connected to a second plate 45 in such a way that it is mounted rotatably relative thereto but can not be moved in the longitudinal direction of the rotating spindle 36 relative to the second plate 45. Instead of with the second plate 45, the rotary spindle 36 with its projecting axial end but also on the housing 26 rotatable, but fixed in the direction of its longitudinal axis, be connected, in which case the first plate 34 and the second plate 45 each completely independent of each other vertically are adjustable.

As the Fig. 3 to 6 show, the second plate 45 is also connected to the axially lower end surface of the central support 18 such that the latter is rotatably mounted on the second plate 45, but in the longitudinal direction of the rotation axis 12 can not be moved relative to the second plate 45.

The cylindrical holder 17 for the mandrel 11, which runs inside the holder 18 designed as a hollow shaft, passes freely through the second plate 45 through a corresponding opening (not shown in the figures) to the first plate 34, which is mounted below the second plate 45 ,

The second plate 45 is connected on its opposite side of the rotary spindle 36 with respect to the holder 18 to a further spindle nut 38 which meshes with a rotary spindle 39, which is driven at its lower end by a third lifting drive 40. At its opposite axial (upper) end of the rotary spindle 39 is fixed to the underside of the end wall 25 of the housing 26, and relative to this relatively rotatable, but not in the direction of the longitudinal axis of the rotary spindle 39 against the end wall 25 movable. By this arrangement, it is now possible by activation of the third lifting drive 40, the spindle nut 38 and thus the second plate 45 in the longitudinal direction of the rotary spindle 39 (corresponding to parallel to the direction of the axis of rotation 12) to move while the middle bracket 18 (with that of her supported bending pin 20), the central holder 17 and the bending mandrel 11 to move in the direction of the axis of rotation 12.

Furthermore, on the same side of the second plate 45, on which it is connected to the spindle nut 38, also a third rotary drive 41 fixed at its upper end to the second plate 45 fixed. Through the second plate 45 therethrough, the third rotary drive 41 can drive an overlying, upper gear 42 which is connected to a non-rotatably attached to the bracket 18 gear (or external teeth 43 formed there) in engagement, so that the middle bracket 18 in the direction of rotation the third rotary drive 41 can be driven.

The central support 18, which forms a first tool with the bending pin 20 carried by it (a second tool forms the outer holder 21 with the bending pin 24 carried by it), can thus via the third rotary drive 41 relative to the middle holder 17 and the outer Holder 21 is rotated and raised or lowered by means of the third lifting drive 37 by moving the second plate 45.

The central holder 17 with the attached at its upper end bending mandrel 11 is driven via the second rotary drive 33 in the direction of rotation and can be moved by activation of the second lifting drive 37 relative to the second plate 45 parallel to the orientation of the axis of rotation 12 and thus raised or lowered.

In the Fig. 2 shown alignment of the individual parts of the bending head 5 to each other is also in the representation of Fig. 3 given.

In Fig. 4 is now the bending head 5 off Fig. 3 shown here, here by operating the second linear actuator 37, the spindle nut 35 runs on the rotary spindle 36 down, so that the first plate 34 moves down and consequently the second rotary drive 33 with the coupled thereto cylindrical holder 17 together with mandrel 11 on his Topside after proceeding below. This achieves a situation where, like Fig. 4 shows the mandrel 11 is lowered below the bending plane in which the axial end surfaces 19 and 23 of the brackets 18 and 21 are located.

In this case, only the bending pins 20 and 24 are in the bending plane and can perform there the desired bending operation.

Fig. 5 now shows an adjustment of the bending head 5, wherein the bending mandrel 11 even further than the position in Fig. 4 lowered and also the middle bracket 18 has also been lowered so far that the upper bending pin 20 of the middle bracket 18 is lowered below the bending plane.

This is achieved in that after reaching the position in Fig. 4 is shown, subsequently (or simultaneously during in conjunction with Fig. 4 shown lowering the central holder 17) by activating the third lifting drive 40 via its rotary spindle 39, the meshing with her spindle nut 38 and with her the second plate 45 are driven with resting on her middle bracket 18 down. In this way, by lowering the middle bracket 18 and the bending pin 20 borne by it out of the bending plane down, as this Fig. 5 shows.

Thus, now only the bending pin 24 is at the top of the outer holder 21 in the bending plane.

Fig. 6 finally shows the bending head 5 from Fig. 5 , wherein the position shown there compared to now the central cylindrical holder 17 by activation of the second lifting drive 37 in the opposite direction (compared to that for reaching the position in Fig. 4 ) is extended on the rotary spindle 36 and the meshing with her spindle nut 35, the first plate 34 with the second rotary drive 33 and the seated on her central holder 17 with the bending mandrel 11 at its upper axial end in the direction of its axis of rotation 12 upwards. In this case, the mandrel 11 is raised so far that - how Fig. 6 shows - the mold base 15 of the bending mandrel 11 is located in the bending plane and the bending pins 13 and 14 attached to it at the top lie outside the bending plane. In this way, the possibility is given to use the lower bending plane of the bending mandrel 11 in cooperation with the bending pin 24 at the top of the outer holder 21 during the bending operation.

In the FIGS. 7 to 13 are now shown with the illustrated bending head 5 executable bending sequences. Here, different bending mandrels 11 are used, it is worked in different levels of bending mandrel 11 and there are different bending methods used:

The FIGS. 7 and 8 show unwinding about a central mandrel 11 having different bending radii and wherein the radially inner bending pin 20, the workpiece 2 bends around a radius of the central bending mandrel 11, while the radially outer bending pin 24 acts as a counter-holder.

In Fig. 8 the end region of the workpiece 2 is in turn bent by the radially inner bending pin 20 by rotation of the holder 19 around the central bending mandrel 11 around, again the radially outer bending pin 24 acts as a counter-holder.

Fig. 9 shows an arrangement of the bending head 5, in which no longer around the forming jaws of the bending mandrel 11 around, but is bent in its lower bending plane around the mold base 15, which in the embodiment of the Fig. 9 has a circular bending radius. Again, by rotating the inner radial bending pin 20 supporting holder 19, the workpiece 2 is bent around the mold base 15 of the bending mandrel 11 around, again the radially outer bending pin 24 serves as a counter-holder for the workpiece 2 during bending.

Fig. 10 shows a bending process in which the bending mandrel 11 is rotated and at the same time a compensating movement of the bending head 5 takes place, in which case the bending pins 24 and 20 together serve as a counter-holder.

At the in Fig. 11 shown bending process, the tool 2 is bent again on the mandrel 11 in its lower level, with two bending radii are provided, as is made Fig. 11 the representation of the bending mandrel 11 immediately shows.

Fig. 12 shows four stages for rolling the end of a workpiece 2, in which the shortest possible end leg is provided. For this purpose, in addition to the movement of the bending pin 20 is rotated in the last two stages of the bending mandrel 11 and thus reduces the distance between the bending pin 20 and bending mandrel 11.

Finally, in Fig. 13 a wind process shown. The workpiece 2 is advanced and the bending mandrel 11 is turned against the workpiece 2 by turning it with its larger diameter bending pin 13. The two bending pins 20 and 24 serve as a counterhold on both sides of the workpiece 2. With this method, larger bends or helical parts can be produced, wherein by rotation of the mandrel 11 and the diameter of the product produced can be changed.

The lowering of a bending pin is always necessary in the bending head 5 according to the invention when it has to be brought under the workpiece 2 on the other side of the same.

So should z. In Fig. 7 are bent in the other bending direction, serving as a backing bending pin 24 and the bending bending pin 20 can be quickly brought under the workpiece 2 on the other side of the same. Likewise, the bending mandrel 11 can be threaded out of the workpiece 2 by the lowering movement possible with it.

In the bending head 5 according to the invention can in principle also be provided that this in its entirety z. B. also laterally (perpendicular to the conveyed workpiece 2) is movably mounted on the machine position (not shown in the figures). As a result, the flexibility of such a bending head 5 is further increased.

The bending pins may be mounted in the bending head 5 shown as a rigid bending pins or as freely rotatable bending rollers. It can also be used bending pins, which is mounted on a rigid bending pin around this rotatable roller. In the embodiments shown in the figures, however, only rigid bending pins are shown.

In addition, there is still the possibility, as also not shown in the figures, that the bending pins 20, 24 and the bending cam 11 are removably attached to the respectively associated brackets 19 and 20 and the holder 17, so that they easily and quickly interchangeable are, if necessary.

The bending head 5 can be arranged with a vertical orientation of its axis of rotation 12 on the associated bending machine 1. But how the Fig. 1 and 2 Recognize, the bending head 5 is often installed but also with a certain lateral inclination, in which the orientation of the axis of rotation 12 to the vertical at an angle, for example below 20 ° to 30 °, inclined, whereby, in particular also in conjunction with an obliquely arranged bending table 7, a slight removal of the parts after processing by slipping is ensured.

Claims (18)

1. Bending head (5) for bending rod- and pipe-shaped workpieces (2) with a retainer (17) rotatable about a rotational axis (12), said retainer bearing a bending mandrel (11) at one axial end, and with at last two further workpieces (18, 20; 21, 24) which each comprise a retaining body (18, 21) with a bending pin (20, 24) at their axial end facing the bending mandrel (11) and from which each - in each case independently of the other workpieces - is rotatable, characterised in that the retaining bodies (18, 21) of the workpieces are arranged concentrically to the retainer (17) of the bending mandrel (11) and can pivot about its rotational axis (12).
2. Bending head according to claim 1 characterised in that the retaining bodies (18, 20) of the workpieces are constructed as concentric hollow shafts inside each other, in whose radial innermost (18) the retainer (17) of the bending mandrel (11) is rotatably seated.
3. Bending head according to claim 1 or 2 characterised in that the bending mandrel (11) and/or the workpieces (18, 20; 21, 24) can be driven between an active operating position, in which they act upon the workpiece (2) to be bent during the bending procedure, and an inactive idle position parallel to the rotational axis (12) of the bending mandrel (11).
4. Bending head according to any of claims 1 to 3 characterised in that a bending roller is mounted on at least one bending pin (20, 24) about which said roller is freely rotatable.
5. Bending head according to any of claims 1 to 4 characterised in that the retaining body (21) of the workpiece with the radially outermost bending pin (24) is rotatably mounted on an upper terminal wall (25) of a housing (26) and is in drive connection with a first rotary actuator (29) attached to this housing (26).
6. Bending head according to claim 5 characterised in that the retaining body (21) of the workpiece with the radially outermost bending pin (24) has external toothing (27), said toothing being engaged with a gear wheel (28) connected to the first rotary actuator (29).
7. Bending head according to claim 6 characterised in that the first rotary actuator (29) on the side of the upper terminal wall (25) of the housing (26) facing away from the bending pins (20, 24) of the workpieces is attached to same wall.
8. Bending head according to any of claims 1 to 7 characterised in that the retainer (17) for the bending mandrel (11) as well as the retaining bodies (18, 21) for the workpieces are each connected to their own rotary actuator (33, 41, 29).
9. Bending head according to any of claims 5 to 8 characterised in that the first rotary actuator (29) is connected to a first elevating mechanism (32), which is constructed for fixed assembly on a machine framework (10) of a bending device (1).
10. Bending head according to any of claims 3 to 9 characterised in that the retaining body (18, 21) of each workpiece is connected to a mechanism (37, 40), by means of which it can be shifted from its inactive idle position to its active operating position and back again.
11. Bending head according to any of claims 1 to 10 characterised in that the bending mandrel (11) and the workpieces are removably attached to its retainer (17) and to their retaining bodies (18, 21), respectively.
12. Bending head according to any of claims 3 to 10 characterised in that the retainer (17) of the bending mandrel (11) is connected at its axial end opposite the bending mandrel (11) to a second rotary actuator (33), which is attached to a first plate (34), which, for its part, can be driven together with the second rotary actuator (33) and the retainer (17) for the bending mandrel (11) in the direction of the rotational axis (12) of said mandrel by means of a second elevating actuator (37).
13. Bending mandrel according to claim 12 characterised in that the second elevating actuator (37) comprises a spindle shaft (36) on the output side, on which said shaft a spindle nut (35) attached to the first plate (34) is mounted, the spindle shaft (36) with its axially protruding end section being rotatably mounted in a second plate (45) at a distance away from the first plate (34), but mounted in a fixed manner in the axial direction of the spindle shaft (36), and the second plate (45) rotatably supporting the bending mandrel-surrounding (11) retaining body (18) of the workpiece for the radially innermost bending pin (20) at its axial end facing away from the bending mandrel (11) vis-à-vis said plate, but supporting in a fixed manner in the direction of the rotational axis (12).
14. Bending head according to claim 13 characterised in that the second plate (45) also supports yet a third rotary actuator (41), by means of which the holder (18) for the radially innermost bending pin (19) can be driven in a direction of rotation.
15. Bending head according to claim 14 characterised in that a third elevating actuator (40) is provided, by means of which the second plate (45) can be longitudinally slid in the direction of the rotational axis (12).
16. Bending head according to any of claims 5 to 15 characterised in that all rotary (29, 33, 41) and elevating actuators (32, 37, 40) are covered by a housing (26) open downwards, on whose upper terminal wall (25) the bending head (5) juts outwards.
17. Bending head according to claim 16 in combination with any of claims 13 to 15, characterised in that the third elevating actuator (40) has a spindle shaft (39) on the output side, on which a spindle nut (38) connected to the second plate (45) is seated, the spindle shaft (39) being rotatably attached at its axially protruding end, but attached in a fixed manner in the axial direction of the spindle shaft (39) on the upper terminal wall (25) of the housing (26).
18. Bending head according to any of claims 1 to 17 characterised in that the bending mandrel (11) is constructed as a multi-radial workpiece or as a four-pin workpiece.

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