EP2380674A2 - Expandable bending head - Google Patents

Abstract

The head (1) has holders (4a, 4b) movably supported on a carriage (3) against each other in a pull-out position. A bending core (13) comprises bending core sections, and bending fingers (12a, 12b) are arranged at holders and swivelable around the core sections on a circular curve type path. Middle points of the path are coincided with each other in the pull-out position, where the bending fingers are swivelable in the path. Drives (9a, 9b) i.e. numerical control drives, are supported at the holders. The bending fingers are designed as bending rollers or sliding pieces.

Description

• einen Biegekern,
• einen ersten Biegefinger und einen zweiten Biegefinger, wobei die Biegefinger an gegenüberliegenden Seiten um den Biegekern verschwenkbar sind,
• und einen verfahrbaren Schlitten, an welchem der Biegekern und die zwei Biegefinger gelagert sind.

The invention relates to a bending head for the plastic deformation of Biegegut, in particular for meandering plastic deformation of tubular Biegegut comprising

• a bending core,
• a first bending finger and a second bending finger, wherein the bending fingers are pivotable on opposite sides about the bending core,
• and a movable carriage on which the bending core and the two bending fingers are mounted.

Such a bending head is from the DE 101 10 217 A1 known.

When plastic deformation of Biegegut so-called bending heads (also bending units) called used. The bending material, usually tubular or rod-shaped and of a coil-shaped stock ("coil") provided unwound and pre-directed, is applied to the bending head to a bending core (this is the actual tool) and forced to the contour of the bending core. Most bending cores have a groove, which facilitates the positioning of the bending material.

When deforming the Biegeguts usually more bending heads are used simultaneously. The bending of the Biegeguts to the bending core is done by a combination of bending core processes (when Biegegut clamped) and the bending of the Biegeguts with so-called bending fingers. The bending finger moves the Biegegut according to the contour of the bending core on the side facing away from the bending core.

In the manufacture of meander-shaped structures from bent material, e.g. For the production of solar modules or other heat exchangers, several meander loops are pulled successively. For the formation of a meander loop, two outer bending heads and a middle bending head engage the initially straight material to be bent. The outer bending heads are contracted and the center bending head is moved with a carriage away from the line of connection of the contracting outer bending heads. While the outer bending heads have only one bending finger, the middle bending head needs two bending fingers, which depart opposite sides of the bending core, corresponding to both arms of the meander loop.

The shape of the finished meander loop depends essentially on the middle bending head. In particular, the middle bending head determines the distance between the two arms of the meander loop and the formation of the loop end, usually as a 180 ° bend or two 90 ° bends with a straight intermediate section.

The requirements for the shape of the meander loop are different depending on the application of the meandering structure to be produced. However, a conventional middle bending head fits exactly only one shape of a meander loop, usually with a 180 ° bend due to coincident bending centers (axes of rotation) of the bending fingers. If, for example, a structure of meander loops with two 90 ° bends and a straight intermediate section with this bending head are to be manufactured, a new bending core with two separate bending core sections of semicircular profile and a filler piece is usually mounted therebetween. The bending fingers are radially offset so that their circular paths pass the 90 ° bends of the bending core sections. However, the bending fingers can not run the same radius as the bending core actually pretends, because the bending centers (axes of rotation or centers) of the bending fingers and the bending core sections fall apart. This reduces the bending quality (for example, due to pipe penetration). If the spacing of the meander loops (i.e., the length of the intermediate piece) becomes too great, the bending head must be replaced with a bending head designed specifically for the desired shape, or two separate center bending heads (each with a bending finger) must be used. In both latter cases, high costs arise through additional components and large conversion costs.

The DE 198 53 294 A1 describes a device for stretch bending of metal rods. The metal rod is applied to two counter bearings and gripped by two clamping means. The clamping means are each arranged on a bending arm which can be pivoted about an axis by a motor. The bending arms are each slidable on sliders to allow different center lengths between the bending points on the metal rod.

The US 2,414,926 describes a tube bending machine in which several bending cores can be moved together with forming rollers by means of carriages on a frame against each other.

The DE 1 280 553 A describes a multi-part bending tool for pipes with two mold blocks, a bearing piece arranged between them, two forming rollers and a clamping block. To demould a bent pipe, the mold blocks are pulled together towards the support piece.

Abandonment of erection

The invention has for its object to enable the production of different shapes of meander loops, in particular with a 180 ° bend or two 90 ° bends, with little effort, especially low conversion costs, with high bending quality.

Brief description of the invention

This object is achieved by a bending head of the type mentioned, which is characterized in that the bending head comprises a first holder and a second holder, wherein the holders are mounted on the carriage against each other,
in that the bending core comprises a first bending core section and a second bending core section,
wherein the first bending finger is arranged on the first holder and the first bending finger is pivotable about the first bending core portion,
and wherein the second bending finger is arranged on the second holder and the second bending finger is pivotable about the second bending core portion, that the bending fingers are each pivotable in a circular arc around their respective bending core portion, and that the holders are slidable on the carriage in a contracted position , in
which the centers of the circular arc-shaped tracks, on which the bending fingers are each pivotable, coincide.

With the present invention, a bending head is provided, with which an adaptation to different shapes to be made of loops of bending material can take place, in particular as a middle bending head in a bending machine with two further outer bending heads, on which meander-shaped structures are manufactured.

The bending head has two brackets, which can be moved against each other on the slide. On these brackets are (at least) the bending fingers mounted together with their traversing mechanism for descending the contour of the deformed Biegeguts directly or indirectly. By setting a suitable distance of the brackets, an adaptation to the size of a loop, in particular the distance between the arms of a meander loop, take place, so that the same bending fingers and the same traversing mechanisms of the bending fingers can be used for different shapes of meander loops. Thus, essentially the same bending head can be used for different shapes of loops to be manufactured, wherein in particular the bending centers of the bending core sections and the bending fingers can be brought into coincidence, so that a high bending quality can be achieved.

In the context of the invention it is provided that the bending fingers are each pivotable about a circular arc-shaped path about their respective bending core portion. The circular path corresponds to the most important, required in practice form of the deformed Biegeguts; The bending core sections are then typically also circular arc-shaped (usually each with a semicircular profile) is formed. Furthermore, it is provided that the holders are displaceable on the carriage in a contracted position, in which the centers of the circular arc-shaped tracks, on which the bending fingers are each pivotable, coincide. As a result, 180 ° bends can be made at the loop ends of the Biegeguts.

Preferred embodiments of the invention

Preferred is an embodiment of the bending head according to the invention, in which the first bending core section and the second bending core section are fastened to the carriage independently of the holders. The bending core sections are not displaceable together with the brackets in this embodiment. The bending core sections may be attached directly or indirectly to the carriage. In this embodiment, the bending core is partially or completely rebuilt or exchanged upon a change of the shape to be fabricated of a loop. Rebuilding or replacing only the bending core is much easier and less expensive than replacing the entire bending head or adding another center bending head. Characterized in that in this embodiment, the bending core sections do not ride on the brackets, in and Ausfädelmechaniken on the bending core (such as a sharing and moving apart of the bending core "in the groove") can be made easier.

An advantageous development of this embodiment provides that the bending core sections are formed integrally together and are releasably secured to the carriage, in particular screwed or clamped. One-piece here means that the two opposite bending core sections are formed on a single component or a single, completely assembled and completely removable assembly (without prejudice to any division of the bending core "in the groove"). For different meander distances then different bending cores must be kept ready to change; the one-piece construction but facilitates this change. Any intermediate sections and counter sections with which a Buckling or bulging of Biegegut between spaced bending core portions is prevented, are preferably integrated into the single component or the only assembly.

An alternative, likewise advantageous development provides that the first bending core section and the second bending core section are formed separately,
in particular wherein on the carriage receptacles, such as elongated holes, are formed, in which the first and the second bending core portion can be fastened at different intervals. In this case, the same bending core portions can be used at different loop sizes (intervals of the meander arms), thereby saving tooling costs.

Particularly advantageous is an embodiment in which the first bending core portion is arranged on the first holder, and the second bending core portion is arranged on the second holder. Also in this case, the first and second bending core portions are formed separately. In this embodiment, the bending core sections need to be converted (offset) or replaced when adapted to a new loop size (a new distance of the meander arms) with the same bending radius. This will further facilitate the customization. Typically, in this embodiment, also loading and Einfädelmechaniken the bending core (such as a division of the bending core sections "in the groove") and their drives partially or completely transferred to the brackets.

Also preferred is an embodiment in which the bending fingers are each pivotable on a circular arc-shaped path about their respective bending core portion in an angular range of at least 100 °. With the angular range of at least 100 ° an overbending angle of at least 10 ° can be ensured, so that even with long meandering the elastic return springs of the arms can be compensated during deformation, especially when parallel meander arms are required.

Very particularly preferred is an embodiment in which the bending fingers are each guided directly or indirectly with a bow guide on their respective holder. The sheet guides are particularly space-saving, in particular, the establishment of a contracted position of the brackets is easily possible. The sheet guide may comprise a rail (or more rails) and be designed in particular as a roller guide or as a sliding guide. Alternatively, lever guides are conceivable.

A preferred embodiment provides that in each case a drive, in particular a servomotor, is mounted on the holders, with which the respective bending finger is pivotable directly or indirectly on the respective holder. The fact that the drive is mounted on the respective holder, the drive is not affected by an adjustment of the distance of the brackets.

Preference is given to a development of this embodiment, in which the bending fingers are each arranged on a base piece, which is mounted pivotably on the associated holder,
in particular, wherein the base piece has an external toothed ring, in which a toothed wheel of the respective drive engages. This arrangement has proven itself in practice. By displacing the bending fingers on the base pieces, the radius with which the bending fingers are moved can also be adapted; this can be recordings and / or
Fixing holes may be provided on the base piece. As an alternative to sprocket and gear other power transmission means can be used, such as a toothed belt.

Particularly preferred is still an embodiment which provides that the bending head comprises an intermediate piece, which is insertable in a spread position of the brackets between the bending core and forms together with the bending core sections a preferably flush and preferably straight running system for the Biegegut, in particular wherein the Bending head further comprises a counterpart, which lies opposite the intermediate piece, so that between the intermediate piece and the counterpart the Biegegut can be clamped.

With the intermediate piece, the installation of the Biegeguts can be done better defined. With the counter piece can be made a backup against buckling / bulging.

Particularly advantageous is an embodiment in which the bending core sections and optionally the intermediate piece in a plane in which the Biegegut is guided, are formed divided and can be opened for unthreading of the Biegeguts perpendicular to this plane, in particular pneumatically or hydraulically. By this division "in the groove" can be done in a simple and fast way, the Biegegut so to speak "through the bending head" to change from the production of a loop to the next. Pneumatic drives have proven to be particularly cost effective here.

According to a preferred embodiment, the bending fingers are designed as bending rollers or sliders. Bending rolls (usually made of steel) have proven to be particularly suitable for deforming bent products made of steel. Sliders, which are made of plastic, are mainly used in the deformation of bending material made of copper or aluminum, in particular copper pipes or aluminum pipes.

Also advantageous is an embodiment in which the distance of the holders on the carriage is continuously adjustable, in particular by means of a hand wheel or by means of a servo or servo motor. Due to the stepless adjustment, an adaptation to any size of loops can be made. A handwheel mechanism is particularly cost-effective; with motorized drives an automation of the adaptation is facilitated.

In the context of the present invention, the use of a bending head according to the invention described above for meandering plastic deformation of Biegegut, in particular of tubes falls. By choosing the distance of the brackets can easily be adapted to a desired size of a Biegegutschlaufe to be produced (such as the distance between two adjacent meander). Tubular Biegegut usually has a circular cross-section; but there are also other cross-sections, such as oval or square pipe profiles possible.

According to a preferred variant of the use according to the invention, by adjusting the spacing of the supports, the bending material is optionally provided with a 180 ° bend in a contracted position or provided with two 90 ° bends in a spread position. Such a change in the shape of the loop end can be done with very little effort with the bending head according to the invention.

Further advantages of the invention will become apparent from the description and the drawings. Likewise, according to the invention, the above-mentioned features and those which are still further developed can each be used individually for themselves or for a plurality of combinations of any kind. The embodiments shown and described are not to be understood as exhaustive enumeration, but rather have exemplary character for the description of the invention.

Detailed description of the invention and drawing

Fig. 1 a

eine schematische, perspektivische Darstellung einer Ausführungsform eines erfindungsgemäßen Biegekopfs, in zusammengezogener Position von Halterungen, mit unverformtem Biegegut;

Fig. 1 b

den Biegekopf von Fig. 1a, in einer Ansicht von oben;

Fig. 1 c

den Biegekopf von Fig. 1a, in einer Ansicht von vorne;

Fig. 2

den Biegekopf aus der Ansicht von Fig. 1c, nach Verformen des Biegeguts;

Fig. 3a

den Biegekopf von Fig. 1a, in einer Ansicht von der Seite, bei geschlossenem Biegekern;

Fig. 3b

den Biegekopf aus der Ansicht von Fig. 3a, bei geöffnetem Biegekern;

Fig. 4a

den Biegekopf aus der Ansicht von Fig. 1a, mit einem mehrteiligen Biegekern, in gespreizter Position der Halterungen, mit unverformtem Biegegut;

Fig. 4b

den Biegekopf von Fig. 4a, in einer Ansicht von vorne;

Fig. 5

den Biegekopf aus der Ansicht von Fig. 4b, nach einem Verformen des Biegeguts;

Fig. 6a

eine schematische Vorderansicht zum Biegekern von Fig. 1a;

Fig. 6b

eine schematische Vorderansicht zum Biegekern von Fig. 4a;

Fig. 7a

eine schematische Vorderansicht einer Biegemaschine, in der ein erfindungsgemäßer Biegekopf eingesetzt wird, in einer Ausgangsstellung;

Fig. 7b

die Biegemaschine von Fig. 7a, in einer Stellung mit gezogener Mäanderschleife.

The invention is illustrated in the drawing and will be explained in more detail with reference to embodiments. Show it:

Fig. 1 a

a schematic perspective view of an embodiment of a bending head according to the invention, in the contracted position of brackets, with undeformed Biegegut;

Fig. 1 b

the bending head of Fig. 1a in a view from above;

Fig. 1 c

the bending head of Fig. 1a in a view from the front;

Fig. 2

the bending head from the view of Fig. 1c , after deformation of the Biegeguts;

Fig. 3a

the bending head of Fig. 1a in a view from the side, with the bending core closed;

Fig. 3b

the bending head from the view of Fig. 3a with open bending core;

Fig. 4a

the bending head from the view of Fig. 1a , with a multi-part bending core, in the spread position of the brackets, with undeformed Biegegut;

Fig. 4b

the bending head of Fig. 4a in a view from the front;

Fig. 5

the bending head from the view of Fig. 4b , after deformation of the Biegeguts;

Fig. 6a

a schematic front view of the bending core of Fig. 1a ;

Fig. 6b

a schematic front view of the bending core of Fig. 4a ;

Fig. 7a

a schematic front view of a bending machine, in which a bending head according to the invention is used, in an initial position;

Fig. 7b

the bending machine of Fig. 7a , in a position with drawn meander loop.

The FIGS. 1a to 1c show schematically an embodiment of a bending head 1 according to the invention for deforming Biegegut 2.

On a carriage 3 are two holders 4a, 4b against each other in a (here horizontal) direction VR (parallel to the x-direction, the directions x, y and z form an orthogonal system) slidably mounted with linear guides 5. The distance between the plate-shaped holders 4a, 4b is adjustable with a handwheel 6 (and a transmission, not shown, such as a left / right spindle); in the contracted position shown here, the distance is zero. The carriage 3 with all structures, in particular both brackets 4a, 4b, with a non-illustrated drive (such as an NC drive) in a (here) vertical plane (approximately in the directions x and z) movable. The bending head 1 is substantially symmetrical with respect to its left (first) and right (second) sides.

On the holders 4a, 4b, in turn, base pieces 7a, 7b are mounted pivotably on arcuate sheet guides 8a, 8b. The essentially plate-shaped base pieces 7a, 7b can in each case via its own drive 9a, 9b, here an NC motor, are driven, each of which is mounted on the associated holder 4a, 4b and movable with this. The transmission of power from the NC motors to the base pieces 7a, 7b takes place in each case via a toothed wheel 10a, 10b and a ring gear 11a, 11b on the base piece 7a, 7b ("gear and pinion"). Note that the left side base piece 7a with its ring gear 11a is set slightly forward with respect to the ring gear 11b of the right side base piece 7b, so that the base pieces 7a, 7b can be slightly pivoted one over the other; the formation of the sprockets 11, 11 b for over-bending is then simplified and it is a symmetrical structure of the bending head 1 allows.

On the base pieces 7a, 7b, respectively, a bending finger 12a, 12b is fixed, wherein the bending fingers 12a, 12b are formed here as sliders. The bending fingers are in a starting position on Biegegut 2.

The Biegegut 2 continues to rest on a bending core 13. This bending core 13 has two mutually opposite bending core sections 14a, 14b, which merge (here) on the same component (with respect to the bending core sections "one-piece" design of the bending core) and can be mentally distinguished by a vertical bisector HA of the bending core 13. The bending core 13 has a groove 15 for the guidance of the Biegeguts 2 and is divided along this groove (see Fig. 3a, 3b ).

The bending core 13 is circular in cross-section here (see. Fig. 1 c) , so that a 180 ° bend of the Biegeguts 2 is prepared; the bending core portions 14a, 14b together form a circle with center point M. The supports 4a, 4b are in a contracted position such that the centers Ma, Mb of the arcuate sheet guides 8a, 8b coincide and also with the center M ("bending center") of the Biegekerns 13 match.

By a method of the base pieces 7a, 7b on the arcuate sheet guides 8a, 8b, the bending fingers 12a, 12b also pivot on a circular path in each case; For this purpose, the gears 10a, 10b by means of the drives (NC motors) 9a, 9b in the in Fig. 1c turned direction.

Fig. 1c shows the bending head, and Fig. 2 the bending head 1 after a pivoting of the base pieces 7a, 7b and the bending fingers 12a, 12b. With the pivoting of the base pieces 7a, 7b relative bending down of the Biegeguts 2 at the outer ends by other (external) bending heads is accompanied (not shown), wherein the bending head 1 is moved away from a connecting line of the two other (outer) bending heads. Due to the contracted brackets 4a, 4b and the coincidence of the centers Ma, Mb, a 180 ° bend (without a straight intermediate section) sets in the Biegegut 2.

It should be noted that the bending material 2 is also more than 90 ° at each bending finger 12a, 12b (90 ° is in Fig. 2 shown) can be bent ("overbending"), in particular in order to obtain a total of 180 ° bending after an elastic spring back of the Biegeguts 2. The sprockets 11 a, 11 b would still allow an overbending of about 10 °.

The FIGS. 3a and 3b illustrate the divisibility of the bending core 13 "in the groove" (here in the y direction with respect to an xz plane) in a side view ("tool splitting"). The bending core 13 has a rear half 18a and a front half 16b (these halves are here integral with respect to the two opposing bending core portions, therefore, the bending core 13 as a whole is also referred to as one piece with respect to the bending core portions, which is preferable for 180 ° bending When manufacturing two 90 ° bends, a three-part design of each half is preferred). The both halves 16a, 16b are in the closed position (FIG. Fig. 3a ) lying together and together form the groove 15 for the Biegegut 2.

In an open position ( Fig. 3b ), the front half 16b is forward of the rear half 16a (in FIG Fig. 3b to the right) so far away that the Biegegut 2 can be easily led out through the resulting gap 17 from the bending head, approximately laterally (in Fig. 3b about to the viewer). For mutual operation of the halves 18a, 16b, two pneumatic cylinders 17a, 17b are used, the associated travel mechanism is not shown in detail.

The FIGS. 4a and 4b show the same bending core 1 as in Fig. 1 a and Fig. 1c but converted to a shape of a grinding end of the bending material 2 to be deformed with two 90 ° bends with a straight intermediate section. Only the differences become Fig. 1a and Fig. 1c explained.

The bending core 13 here has two separate and spaced apart bending core sections 14a, 14b, each having a semicircular profile. Between the bending core portions 14a, 14b, an intermediate piece is inserted (in the FIGS. 4a and 4b covered, cf. to Fig. 6b ). The spacing of the bending core sections 14a, 14b with respect to the centers M 'and M "(" bending centers ") of the semicircular profiles is AB The bending core sections 14a, 14b and the intermediate piece are here directly on the carriage 3 (and not on the supports 4a, 4b ) attached.

To adapt to the distance AB of the bending core portions 14a, 14b, the brackets 4a, 4b are set in a spread position with also the distance AB; the adjustment was made by means of the hand wheel 6. The centers Ma, Mb of the circular paths of the sheet guides 8a, 8b then also have the distance AB and coincide with the centers M ', M "of semicircular profiles of the bending core sections 14a, 14b together. The bending finders 12a, 12b mounted on the holders 4a, 4b can then be moved by means of the base pieces 7a, 7b on circular paths around their respective bending core portion 14a, 14b (or its center at M ', M ").

After deformation of the Biegeguts 2, see. Fig. 5 , And in particular when pivoting the bending fingers 12a, 12b and the base pieces 7a, 7b then turns at the end of a loop straight intermediate portion 18 (shown in phantom, since actually covered by the inclusion of the front half of the bending core 16b, see. Fig. 3b ), followed by two 90 ° bends.

Fig. 6a and Fig. 6a show again schematically the conditions at the bending core 13 in the situations of Fig. 1a-1c and Fig. 4a-4b in a front view, without occlusions.

In the configuration for a 180 ° bend of Biegegut 2, see. Fig. 6a , a bending core 13 is provided with a fully circular profile, around which the bending finders 12a, 12b are guided on both sides on a circular path with coinciding centers Ma, Mb. The bending core 13 can be understood as comprising two bending core sections 14a, 14b with a semicircular profile, wherein the bending core sections 14a, 14b adjoin or overlap one another.

In the configuration for two spaced 90 ° bends of Biegegut 2, see. Fig. 6b , Bend core 13 comprises two bending core portions 14a, 14b with semicircular profile, which are spaced from each other, see. Distance AB. Between the bending core portions 14a, 14b, a straight intermediate piece 19 ("filler") is inserted, which is flush with the bending core portions 14a, 14b. The intermediate piece 19 opposite is a straight counterpart 20, wherein between the intermediate piece 19 and the counterpart 20 just enough space for the Biegegut 2 remains. The brackets (not shown here), on which the bending fingers 12a, 12b can be pivoted, were placed in a spread position, so that the centers Ma, Mb of the tracks of the bending fingers 12a, 12b by the distance AB corresponding to the distance AB of the bending core sections 14a, 14b fall apart.

Fig. 7a shows a schematic side view of a bending machine 70, in which a bending head 1 according to the invention as a central bending head when pulling meander loops (here with 180 ° bends) is used. In a starting position, a first outer bending head 71 and a second outer bending head 72 and the middle bending head 1 are applied to the still undeformed, straight Biegegut 2 and take it (of the bending heads are simplifying only the bending cores indicated). Subsequently, the outer bending heads 71, 72 are relatively moved towards each other (in the example shown, only the first outer bending head 71 moves to the right), and the middle bending head 1 is pulled up here from the line connecting the outer bending heads 71, 72, but remains in the middle between the outer bending heads 71, 72. As a result, the Biegegut 2 is pulled in a loop up, see. to Fig. 7 b. In the same way several loops can be pulled one behind the other so that a meandering structure is created.

Claims (16)

Bending head (1) for the plastic deformation of bending material (2), comprising a bending core (13), a first bending finger (12a) and a second bending finger (12b), wherein the bending fingers (12a, 12b) are pivotable on opposite sides about the bending core (13), - and a movable carriage (3) on which the bending core (13) and the two bending fingers (12a, 12b) are mounted, characterized,
that the bending head (1) comprises a first bracket (4a) and a second holder (4b), wherein the supports (4a, 4b) on the carriage (3) are mounted relative to one another,
in that the bending core (13) comprises a first bending core section (14a) and a second bending core section (14b),
wherein the first bending finger (12a) is arranged on the first holder (4a) and the first bending finger (12a) is pivotable about the first bending core portion (14a),
and wherein the second bending finger (12b) is arranged on the second holder (4b) and the second bending finger (12b) is pivotable about the second bending core portion (14b),
in that the bending fingers (12a, 12b) are each pivotable on a circular arc-shaped path about their respective bending core section (14a, 14b),
and that the brackets (4a, 4b) on the carriage (3) are displaceable in a contracted position, in which the centers (Ma, Mb) of the arcuate paths, on which the bending fingers (12a, 12b) are each pivotable, coincide. Bending head (1) according to claim 1, characterized in that the first bending core section (14a) and the second bending core section (14b) independently of the holders (4a, 4b) are secured to the carriage (3). Bending head (1) according to claim 2, characterized in that the bending core portions (14a, 14b) are integrally formed together and are releasably secured to the carriage (3). Bending head (1) according to claim 2, characterized in that
in that the first bending core section (14a) and the second bending core section (14b) are formed separately. Bending head (1) according to claim 1, characterized in that the first bending core portion (14a) is disposed on the first support (4a), and the second bending core portion (14b) is disposed on the second support (4b). Bending head (1) according to one of the preceding claims, characterized in that the bending fingers (12a, 12b) in each case on a circular arc-shaped path about their respective bending core portion (14a, 14b) are pivotable in a diaper region of at least 100 °. Bending head (1) according to one of the preceding claims, characterized in that the bending centers of the bending core sections (14a, 14b) and the bending fingers (12a, 12b) are in coincidence. Bending head (1) according to one of the preceding claims, characterized in that the bending fingers (12a, 12b) are each guided directly or indirectly with a sheet guide (8a, 8b) on their respective support (4a, 4b). Bending head (1) according to one of the preceding claims, characterized in that on the holders (4a, 4b) each have a drive (9a, 9b), in particular a servomotor, is mounted, with which the respective bending fingers (12a, 12b) directly or is indirectly pivotable on the respective holder (4a, 4b). Bending head (1) according to claim 9, characterized in that the bending fingers (12a, 12b) are each arranged on a base piece (7a, 7b) which is pivotably mounted on the associated holder (4a, 4b). Bending head (1) according to one of the preceding claims, characterized
in that the bending head (1) comprises an intermediate piece (19) which can be inserted in a spread position of the holders (4a, 4b) between the bending core sections (14a, 14b) and together with the bending core sections (14a, 14b) is preferably flush and preferred straight running system for the bending material (2) is formed. Bending head (1) according to one of the preceding claims, characterized in that the bending core sections (14a, 14b) and optionally the intermediate piece (19) are formed in a plane in which the Biegegut (2) is guided divided and for unthreading of the Biegeguts (2) can be opened perpendicular to this plane, in particular pneumatically or hydraulically. Bending head (1) according to one of the preceding claims, characterized in that the bending fingers (12a, 12b) are designed as bending rollers or sliders. Bending head (1) according to one of the preceding claims, characterized in that the distance (AB) of the holders (4a, 4b) on the carriage (3) is infinitely adjustable. Use of a bending head (1) according to one of the preceding claims for meander-shaped plastic deformation of bending material (2), in particular of pipes. Use according to claim 15, characterized in that by adjusting the distance (AB) of the brackets (4a, 4b) optionally the Biegegut (2) in a contracted position with a 180 ° bend is provided or provided in a spread position with two 90 ° bends.

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