EP3052256B1 - Bending press and bending method - Google Patents

Description

The invention relates to a bending press according to the preamble of claim 1 and a method for forming a workpiece according to the preamble of claim 13.

The so-called swivel bending and swing bending presses used for this purpose have long been in use, especially in the production of sheet metal housings or sheet metal profiles they are long known prior art (eg EP 1 797 973 A1 ).

An important factor in this case is to be able to carry out forming angles of more than 90 ° on the workpiece so that bending angles of at least 90 ° can be achieved even after an unavoidable return spring of a workpiece that occurs during unloading.

This requires that a bending edge arranged on the bending cheek of a swivel press brake be moved in a first step at a distance at jaws or holddowns, which is the workpiece hold and then in a second step is moved transversely in the direction of the hold-down to form a forming angle on the workpiece to be able to effect as 90 °. Since this is not possible with a simple straight guide of the bending beam, have folding machines on consuming and complicated guides and drives in order to perform such combined movements of the bending cheek can. This complexity of the bending-beam drive also often brings limitations of the possible bending length and the machinable workpiece thickness.

The object of the invention is to provide a bending press which has the advantages of the known pivoting bending method, but has a simple structure and has the said limitations only to a lesser extent.

The object of the invention is achieved by a generic bending press, in which the bending beam guide is designed as a linear guide and a rectilinear trajectory of the bending edge causes and the forming edges of both jaws are adjustable by means of a transverse guide the clamping bar and an adjustment along an adjustment, which is connected to the trajectory approximates the bending edge. This relative movement of Clamping bar transversely to the movement path of the bending beam can be done at right angles or obliquely to the movement path of the bending beam. In such a bending press, the complicated movement of the bending cheek of a swing bending press relative to the fixed jaws holding the workpiece is replaced by a combination of simple movements of the bending beam and the jaws. The fact that the workpiece has to be moved with the jaws in this case, as a disadvantage much less significant than the advantages achieved thereby. The transverse guidance of the jaws or the latter carrying the clamping bar can be structurally very simple, as well as the linear guide of the bending beam.

The straight guide of the bending beam is preferably oriented in the vertical direction, but there are also embodiments possible in which the straight guide obliquely to the vertical direction or horizontally.

The leadership of the clamping bar does not necessarily have to be rectilinear, but can also cause a movement in the form of a curve that approximates the linear trajectory of the bending beam. For example, a movement of the clamping bar along a part of a circular path can take place.

An embodiment with little additional effort for the parallel adjustability of the two clamping bars is achieved when the transverse guide comprises the clamping bar guide of the second clamping bar and one of them structurally separate clamping bar guide of the first clamping bar, the adjustment paths of the clamping bar parallel to each other. Since a clamping bar guide and a clamping bar drive is required in any case for carrying out the clamping operation, it can be advantageously used in this specific embodiment also for the purposes of transverse guidance. The clamping bar guide of the first clamping bar can be constructed structurally simple the same as the clamping bar guide of the second clamping bar.

An embodiment which requires only small adjustment forces for the transverse adjustment, is achieved when the clamping bar guides are formed as mutually parallel linear guides and extend in a helix angle, in particular between 10 ° and 30 °, to the bending guide. Neglecting the effects of friction results in a Helix angle of 30 ° with respect to the adjusting force in the direction of the jaw guide a twice as large force component for the transverse adjustment.

An alternative design of the bending press is that the transverse guide of the clamping bar runs approximately at right angles to the bending beam guide. As a result, a clear separation of clamping bar guide and clamping bar drive on the one hand and transverse guide with adjustment on the other hand given. The respective guides and drives can be designed optimized for the respective requirement. The transverse guide and the adjustment require in contrast to the clamping bar only a small work path, which is why a variety of structural solutions can be chosen, such. Linear guides, eccentric guides, etc.

A stable synchronization of the movement of the two clamping bars is achieved when the clamping bar guides are arranged on a clamping bar frame, which is adjustable relative to the machine frame by means of the transverse guide and the adjusting transversely, ie at right angles or obliquely to the trajectory of the bending edge. Any differences in the movements of the clamping bar by two separate acting on the clamping bar frame drives can be avoided if a common central adjustment is provided for adjusting the clamping bar frame.

An assembly-friendly embodiment of a bending press is achieved when the bending beam guide on a first frame part, in particular O-frame, and the clamping bar guide and the transverse guide on a second thereto spaced second frame part, in particular O-frame are arranged. The two O-frames are connected by suitable side stands.

A slim and material-saving embodiment of a bending press is provided when the bending beam guide and the jaw guide and the transverse guide on opposite outer sides of a central frame part, in particular an O-frame, are arranged. The power flow between the bending beam and clamping bar in this case takes place over a short distance directly over the central frame part.

To be able to perform both positive bending and negative bending in an opposite direction without turning the workpiece, it is advantageous if two oppositely adjustable bending beam are arranged for bending in opposite directions on the machine frame.

Since in each case only one bending beam is used, it is further possible that two mutually distanced and oppositely oriented bending beam are arranged on a common beam frame, in particular O-frame, and this is rectilinearly adjustable by means of the bending beam guide. The common beam frame has a high deformation stiffness and can be performed very accurately, which also gives increased bending accuracy.

To facilitate adaptation of the bending parameters to the respective bending task, in particular to the thickness of a workpiece, it is advantageous if a horizontal distance between the clamping bar and the bending beam is adjustable. Particularly in the case of thick workpieces, the bending process can be carried out at an increased distance and thus with a longer lever arm, e.g. at least three times the material thickness of the workpiece to be introduced, whereby the bending drive can be spared or can be made smaller.

The flexible applicability of a bending press is substantially increased if the forming edges on the jaws and / or the bending edge on the bending beam from tool segments in the form of bending tools and clamping tools are assembled and thereby easily different lengths of the bending edge or the Umformkanten can be realized. For this required setup operations can e.g. also be automated with spindles for tool movement.

In order to be able to easily feed large workpieces of the bending press and curved workpieces can be removed easily from the bending press, it is advantageous if the machine frame between the clamping bar and the bending beam or a free through hole is formed for a workpiece. As a result, it can be bent in a certain way in the pass, because workpieces do not have to be removed again on the feed side.

The object of the invention is further achieved by a method for forming a workpiece, in which this is clamped between a first jaw with a first forming edge and a second jaw with a second forming edge so that a portion protrudes between the forming edges and then a bending edge of a adjustable bending beam is guided past the Umformkanten at a distance, whereby the portion is angled relative to the clamped between the jaws part of the workpiece. According to the invention, the bending edge is guided during bending along a rectilinear trajectory and, after the bending edge has passed the forming edges, the latter has been displaced along an adjustment path which approaches the trajectory of the bending edge.

An easily practicable variant of the method is that after the bending edge has passed the Umformkanten, the adjustment of the bending edge is largely or completely stopped and simultaneously or immediately thereafter the Umformkanten are guided at a right angle to or across the trajectory of the bending edge , In this case, the lower jaw or the lower clamping bar requires no adjustability in the vertical direction and a vertical adjustment of the workpiece during the forming process is not required.

An alternative embodiment of the method may be that after the bending edge has passed the forming edges, the forming edges are guided at a skew angle transversely to or across the trajectory of the bending edge and the adjustment of the bending edge coupled with the movement of Umformkanten until the completion of the forming process will continue. The transverse guidance of the clamping bar can be accomplished in this case solely by two parallel clamping bar guides.

For a better understanding of the invention, this will be explained in more detail with reference to the following figures.

Fig. 1

das Verfahren zum Umformen eines Werkstückes vor Beginn des Umformvorganges;

Fig. 2

das Verfahren zum Umformen eines Werkstückes am Ende des Umformvorganges;

Fig. 3

eine Ansicht einer möglichen Ausführungsform einer erfindungsgemäßen Biegepresse;

Fig. 4

eine Schnittdarstellung einer möglichen Ausführungsform einer Biegepresse;

Fig. 5

eine Schnittdarstellung einer weiteren möglichen Ausführungsform einer Biegepresse;

Fig. 6

eine Schnittdarstellung einer weiteren möglichen Ausführungsform einer Biegepresse.

In each case, in a highly simplified, schematic representation:

Fig. 1

the method for forming a workpiece before the beginning of the forming process;

Fig. 2

the method for forming a workpiece at the end of the forming process;

Fig. 3

a view of a possible embodiment of a bending press according to the invention;

Fig. 4

a sectional view of a possible embodiment of a bending press;

Fig. 5

a sectional view of another possible embodiment of a bending press;

Fig. 6

a sectional view of another possible embodiment of a bending press.

In the Fig. 1 and 2 the inventive method for forming a workpiece 1 is shown, wherein in Fig. 1 the state before the beginning of the forming process and in Fig. 2 the state is shown at the end of the forming process. It is a special embodiment of the known as swivel bending forming process.

In this case, the workpiece 1 is clamped between a first clamping jaw 2 and a second clamping jaw 3, so that a partial section 4 can be angled relative to the remaining workpiece 1 during the subsequent forming process. The workpiece 1 consists of at least partially planar material that is suitable for a bending deformation. On the jaw 2 a forming edge 5 is formed, which is effective when the portion 4 is angled downwards, and is formed on the second jaw 3, a second forming edge 6, which is effective when the portion 4 is angled upward. In the illustrated embodiment, the jaws 2, 3 have a shoe-like cross-section, whereby a workpiece 1 on the Umformkanten 5, 6 can be bent beyond a right angle. The bending of the section 4 by means of a bending beam 7, which has a bending edge 8. In Fig. 1 and 2 In this case, a bending beam 7 is shown with a bending edge 8, which is provided for an angling of the section 4 down.

The forming edges 5, 6 are provided with a radius which also influences the smallest possible inner radius of the bent workpiece at the forming point.

During the forming process, the bending beam 7 is moved approximately at right angles to a horizontal workpiece plane 9 downward, wherein the bending edge 8 has a horizontal distance 10 to the forming edges 5, 6.

The distance 10 is at least as large as a workpiece thickness 11 selected, and is preferably 1.5 times to 8 times the workpiece thickness 11. Especially with thick workpieces 1, a greater distance 10, the initiation of the forming process by better leverage facilitate.

In the forming process according to the invention, the bending edge 8 is guided along a rectilinear trajectory 12, even after it has passed the two forming edges 5 and 6 and thereby the portion 4 is brought into an angled position. With fixed clamping jaws 2, 3, with such a linear trajectory 12 of the bending edge 8 of the section 4 can be angled up to 90 ° maximum, if a distance 10 is selected, which corresponds approximately to the workpiece thickness 11, by an unavoidable springback after removal of the bending edge. 8 can thus be achieved with the rectilinear movement of the bending edge 8 only a deformation angle smaller than 90 °. In the forming methods known from the prior art, therefore, the bending beam 7 with the bending edge 8 after passing through the Umformkanten 5, 6 deviating from the rectilinear trajectory 12 with a movement component parallel to the workpiece plane 9 to the jaws 2, 3, whereby the subsection 4 can be formed over a deformation angle of 90 ° beyond. This requires that the guidance of the bending beam 7 must allow movements both in the vertical direction and in the horizontal direction.

In contrast to this method known from the prior art, in the method according to the invention, the bending edge 8 remains even after passing through the forming edge 5, 6 on its rectilinear trajectory 12, and an angling of the portion 4 is caused beyond 90 °, that the Forming edges 5, 6 of both clamping jaws 2, 3 are adjusted together with the clamped workpiece 1 along an adjustment path 13, which approximates the trajectory 12 of the bending edge 8 and in Fig. 2 is shown by an arrow.

Thus, while in the known forming method of the pivoting bending of the bending beam 7 must perform a relatively complicated movement to achieve an angled movement of the bending edge relative to the Umformkanten 5, 6, it is simplified in the process according to the invention characterized in that the bending beam 7 and the jaws. 2 , 3 only just trajectories must put back, making the necessary guides structurally simple.

The workpiece 1 that is angled downwards from the bending edge 8 in front of the transverse movement of the clamping edges 5, 6 is indicated by dashed lines in FIG. The subsequent reduction of the distance 10 between clamping jaws 2, 3 and the bending beam 7 and the forming edges 5, 6 and the bending edge 8 after passing through the Umformkanten 5, 6 results accordingly from a transverse to the rectilinear trajectory 12 relative movement between the jaws. 2 It is possible that during this relative movement of the bending beam 7 is at a standstill and only the jaws 2, 3 are moved with the clamped workpiece 1, but it is also possible that the rectilinear movement of the bending edge. 8 is continued along the trajectory 12 and at the same time the jaws 2, 3 are adjusted along a transverse to the movement path 12 adjusting, whereby a rectangular or oblique relative movement between the bending beam 7 and jaws 2, 3 results. Accordingly, the adjustment path 13 of the clamping jaws 2, 3 is not necessarily oriented at right angles to the movement path 12 of the bending edge 8, but may also run obliquely to it along a straight line or along a curved path, for example a circular path, which runs obliquely to the movement path 12. In Fig. 2 is shown with dotted arrow such a curved adjustment path 14, which can be generated for example by means of an Exzenterlagerung the jaws 2, 3 or the machine parts carrying these.

In the Fig. 1 and 2 is further shown with a double arrow, the clamping movement 15 of the jaw 3 relative to the jaw 2. An alternative embodiment of the method is also in Fig. 2 indicated, in which the bending beam 7 a deviating from the vertical direction, but again straight with dashed arrow indicated trajectory 16 is moved along and the jaws 2, 3 pass through with the clamped workpiece 1 a relation to the vertical direction oblique adjustment 17. The adjusting movements of the bending beam 7 and the clamping jaws 2, 3 can be coupled by a control device so that there is an optimal relative to the forming process relative movement.

Fig. 3 shows a rear view of a bending press 18 according to the invention with the basis of the Fig. 1 and 2 described forming process can be performed.

The bending press 18 comprises a machine frame 19, in which already with reference to Fig. 1 and 2 described, adjustable bending beam 7 and two clamping jaws 2, 3 supporting clamping beams are mounted adjustable. The illustrated machine frame 19 comprises at its front side 20 a plate-shaped O-frame 21 and at its rear side 22 likewise a plate-shaped O-frame 23. The recesses in the O-frames 21 and 23 form a passage opening 24 which extends through the bending press 18 extends and allows the feeding of a workpiece 1 to the clamping bar or the bending beam 7 and, for example, also allows the discharge of the bent workpiece on the back 22.

On the front side 20 of the bending press 18, a support device 25 is arranged in the illustrated embodiment, which can carry the outside of the bending press 18 located part of a workpiece 1 and optionally also in addition to the running of the jaws 2, 3 with the clamped workpiece 1 movements synchronously, to avoid unwanted work piece deformations. This adjustment of the support device 25 is in Fig. 3 indicated by double arrows in the main coordinate directions.

The machine frame 19 further comprises side stand, which connect the two O-frames 21, 23 in the illustrated embodiment. Gaps between structural components of the machine frame 19 may be closed by covers, whereby a largely closed machine exterior is given.

Fig. 4 shows a cross section through a further embodiment of a bending press 18, with which a workpiece 1 can be angled.

A workpiece 1 can be introduced through a through hole 24 in the machine frame 19 in the interior of the bending press 18, where it is held by a clamping device 26 for carrying out the forming process. The clamping device 26 comprises a first clamping bar 27 which carries the first clamping jaw 2 and a second clamping bar 28 which carries the second clamping jaw 3. The second clamping bar 28 is adjustable relative to the first clamping bar 27 by means of a clamping bar guide 29 and a clamping bar drive 30. The first lower clamping bar 27 is extended in this embodiment to an O-frame 31 which extends into the upper half of the bending press 21 and carries the fixed part of the clamping bar guide 29. This includes, for example, a linear guide rail, with which the upper second clamping bar 28 is guided in the vertical direction in the machine frame 19. The clamping bar drive 30 is formed in the illustrated embodiment by a hydraulic cylinder 32, but may alternatively be performed by a spindle drive with electric motor.

The adjustable bending beam 7 is mounted by means of a bending beam guide 33 in the form of a linear guide 34 adjustable on the machine frame 19 and is driven by a bending beam drive 35, here in the form of a hydraulic cylinder 36. The bending edge 8 at the lower end of the bending beam describes a rectilinear trajectory 12 (see Fig. 1, 2 ), which runs in the illustrated embodiment in the vertical direction. By means of an oblique bending beam guide 33, a movement path 12 deviating from the vertical direction could also be possible. As in Fig. 4 Furthermore, the bending edge 8 may be formed by a bending tool 37 removably mounted on the bending beam 7. Furthermore, the bending edge 8 can be adjusted in length by juxtaposition of such bending tools 37 to the required bending task.

In Fig. 4 is further indicated by dashed lines that below the first bending beam 7, a further bending beam 38 may be provided with a further bending edge 39, with a workpiece 1 can also be angled upwards. On the presentation of the bending beam guide and the bending beam drive is omitted for reasons of clarity at this point.

To that on the basis of Fig. 1 and 2 already described bending process 27 and 28 are mounted by means of a transverse guide 40 and an adjustment 41 relative to the machine frame 19 in the horizontal direction adjustable. As a result of this adjustability, a section of the workpiece 1 angled off with the aid of the bending beam 7 or the bending edge 8 can be angled over a deformation angle of greater than 90 °.

The adjusting drive 41 is supported on the one hand on the machine frame 19 and on the other hand on the O-frame 31, which is connected to the lower clamping bar 27 and the clamping bar guide 29 with the upper clamping bar 28. The O-frame 31 is guided on its underside and its top over the transverse guide 40 on the machine frame 19, wherein as a transverse guide 40 in the illustrated embodiment, a linear guide is provided. As an alternative to this embodiment, a transverse guide 40 would also be possible by means of eccentric mounting on the machine frame 19, as a result of which an in Fig. 2 already shown, arcuate adjustment 14 for approaching the jaws 2, 3 to the path of movement of the bending edge 8 is possible.

The adjusting drive 41 is realized in the illustrated embodiment by two hydraulic cylinders 42 which perform synchronized movements and thereby ensure a uniform horizontal adjustment. In this embodiment of a bending press 18 is advantageous that the lower jaw 2 has no vertical component of movement during the forming process and therefore a clamped workpiece 1 must be moved only in the horizontal direction. A vertical adjustment of a support device 25 is not required in this case.

Fig. 4 shows further that the markers 2, 3 can be composed of attached to the clamping bar 27, 28 clamping tools 43.

In Fig. 5 a further and optionally independent embodiment of a bending press 18 is shown, again for the same reference numerals or component designations as in the preceding Fig. 1 to 4 be used.

In the in Fig. 5 1, the machine frame 19 comprises two O-frames 21 and 23 which are spaced apart from one another and between which cooperating clamping beams 27 and 28 and the alternatively used bending beams 7 and 38 are arranged to be adjustably mounted.

The bending beams 7, 38 carry, as already based on Fig. 4 Bending tools 37, with which an adapted for the respective bending task bending edge 8 or 39 is formed. The bending tools 37 can thereby be automatically guided, for example, by means of movement spindles 44 along the bending beam 7, 38.

The bending beams 7 and 38 are adjustably mounted by means of linear guides 34 on the inside of the O-frame 23 and further driven by means not shown Biegebalkenantrieben 35, for example in the form of hydraulic cylinders or spindle drives with electric motor drive-connected.

The clamp jaws 2, 3 bearing clamping bar 27 and 28 are mounted on the inside of the other O-frame 21, wherein the clamping bar guide 29 of the upper clamping bar 28 with respect to the bending beam guide 33 in the form of the linear guide 34 is arranged obliquely.

The obliquely arranged clamping beam guide 29 is in this embodiment part of the transverse guide 40, which further includes a clamping bar guide 45 of the lower clamping bar 27. This is aligned parallel to the clamping bar guide 29 of the upper clamping bar 28, which is why a workpiece 1 clamping clamping bars 2 and 3 can be adjusted exactly synchronously with each other. These are in Fig. 5 not shown Klemmbalkenantriebe provided, for example, include hydraulic cylinders or spindle drives with electric motors. The adjustment drive 41 for the clamping bar 27 and 28 is formed in this embodiment by the two synchronized beam drives. Alternatively, it is also possible to mechanically lock the two clamping bars 27 and 28 at clamping therebetween workpiece 1 against each other and both clamping bars 27, 28 by means of only one clamping bar drive, thereby also an adjustment 41 for the transverse movement of the clamping bar 27 and 28 relative to Bending beam movement can be formed. As Fig. 5 shows further, a support element 46 may be provided at the lower clamping bar 27 be that forms part of a support device 25 for a workpiece 1. The two O-frames 21 and 23 are interconnected via side posts 47 or other cross connectors, whereby the power flow between the two O-frames 21 and 23 is made.

The inclination of the clamping beam guides 29 and 45 may be made for example by wedge-shaped spacers 48, on which bearing rails for the linear guides of the clamping bar guides 29, 45 are attached. An existing between the linear guide 34 of the bending beam 7, 38 and the clamping bar guides 29, 45 helix angle 49 is in particular between 10 ° and 30 °.

In Fig. 6 is a further and optionally independent embodiment of the bending press 18 is shown, again for like parts, the same reference numerals or component designations as in the preceding Fig. 1 to 5 be used. In order to avoid unnecessary repetition, the detailed description in the previous ones will be used Fig. 1 to 5 referred or referred.

The embodiment according to Fig. 6 has one according to the embodiment according to Fig. 5 similar kinematics of the bar movement, but it is different from Fig. 5 a central, plate-shaped frame member 50 is provided, on whose opposite outer sides 51 and 52, the bending beam guides 33, 34 and the clamping bar guides 29 and 45 are arranged. The power flow from the Umformkanten to the bending edge takes place in this embodiment directly over the central frame member 50 and can be dimensioned weaker in this embodiment, the side stand 47 due to the lower load. In this embodiment, the central frame part 50 is embodied, for example, as an O-frame and results in a very large bending clearance both in front of and behind the bending tools.

In the described embodiments, it is further possible that two mutually distanced and oppositely oriented bending beam 7, 38 are arranged on a common beam frame, in particular O-frame, and this is rectilinearly adjustable by means of the bending beam guide 33 in the form of linear guide 34.

For the sake of order, it should be pointed out that in order to better understand the structure of the bending press 18, these or their components have been shown partially unevenly and / or enlarged and / or reduced in size

The embodiments show possible embodiments of the bending press 18, which should be noted at this point that the invention is not limited to the specifically illustrated embodiments thereof, but also various combinations of the individual embodiments are possible with each other and this variation possibility due to the teaching of technical action representational invention in the skill of those skilled in this technical field.

Furthermore, individual features or combinations of features from the different exemplary embodiments shown and described can also represent independent, inventive or inventive solutions.

The task underlying the independent inventive solutions can be taken from the description.

Finally, it should be noted that in the differently described embodiments, the same parts are provided with the same reference numerals or the same component names, the revelations contained in the entire description can be mutatis mutandis to the same parts with the same reference numerals or identical component names. Also, the location information chosen in the description, such as top, bottom, side, etc. related to the immediately described and illustrated figure and these position information in a change in position mutatis mutandis to transfer to the new location.

All information on ranges of values in objective description should be understood to include these arbitrary and all sub-ranges thereof, eg the indication 1 to 10 should be understood to encompass all sub-ranges, starting from the lower limit 1 and the upper limit 10 that is, all portions begin with a lower limit of 1 or greater and end at an upper limit of 10 or less, eg, 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10.

Above all, the individual in the Fig. 1, 2 ; 3 ; 4 ; 5 ; 6 shown embodiments form the subject of independent solutions according to the invention. The relevant objects and solutions according to the invention can be found in the detailed descriptions of these figures. <B> Reference Numbers </ b> 1 workpiece 31 O-frame 2 jaw 32 hydraulic cylinders 3 jaw 33 Bending beam guidance 4 section 34 linear guide 5 forming edge 35 Bending beam drive 6 forming edge 36 hydraulic cylinders 7 bending beams 37 bending tool 8 bending edge 38 bending beam 9 workpiece level 39 bending edge 10 distance 40 width guide 11 workpiece thickness 41 adjustment 12 trajectory 42 hydraulic cylinders 13 adjustment path 43 Tightening tool 14 adjustment path 44 spindle 15 clamping movement 45 Clamping bar guide 16 trajectory 46 Support element 17 adjustment path 47 kickstand 18 bending press 48 spacer 19 machine frame 49 helix angle 20 front side 50 frame part 21 O-frame 51 outside 22 back side 52 outside 23 O-frames 24 passage opening 25 support device 26 clamping device 27 clamping bars 28 clamping bars 29 clamping beam guide 30 clamping bar drive

Claims (15)

1. A bending press (18) for forming a workpiece (1), comprising a fixed machine frame (19), a clamping device (26) arranged on the latter comprising a first clamping beam (27), which comprises a first clamping jaw (2) with a first shaping edge (5), and a second clamping beam (28) adjustable relative thereto by means of clamping beam guide (29) and a clamping beam drive (30), which comprises a second clamping jaw (3) with a second shaping edge (6), wherein the workpiece (1) can be clamped between the clamping jaws (2, 3), and at least one bending bar (7, 38) adjustable by means of a bending bar guide (33) and a bending bar drive (35) relative to the machine frame (19) with at least one bending edge (8, 39), the movement path (12) of which moves at a distance (10) past the shaping edges (5, 6) of the clamping jaws (2, 3) and by means of which a portion (4) of the workpiece (1) projecting between the shaping edges (5, 6) can be angled relative to the part of the workpiece (1) clamped between the clamping jaws (2, 3), characterized in that the bending bar guide (33) is designed as a linear guide (34) and produces a straight movement path (12) of the bending edge (8, 39) and the shaping edges (5, 6) of both clamping jaws (2, 3) by means of a transverse guide (40) of the clamping beams (27, 28) and an adjusting drive (41) are adjustable along an adjustment path (13, 14, 17) which approaches the movement path (12) of the bending edge (8).
2. The bending press (18) according to claim 1, characterized in that the transverse guide (40) comprises the clamping beam guide (29) of the second clamping beam (28) and a structurally separate clamping beam guide (45) of the first clamping beam (27), wherein the adjustment paths (13, 14, 17) of the clamping beams (27, 28) run parallel to one another.
3. The bending press (18) according to claim 2, characterized in that the clamping beam guides (29, 45) are designed as mutually parallel straight guides and run at an inclination angle (49), in particular between 10° and 30°, relative to the bending bar guide (33).
4. The bending press (18) according to claim 1, characterized in that the transverse guide (40) of the clamping beam (27, 28) runs approximately at a right angle to the bending bar guide (33).
5. The bending press (18) according to claim 1 or 4, characterized in that the clamping beams (27, 28) are arranged on a clamping beam frame, in particular an O-frame (31), which is adjustable relative to the machine frame (19) by means of the transverse guide (40) and the adjusting drive (41) transversely to the movement path (12) of the bending edge (8, 39).
6. The bending press (18) according to one of the preceding claims, characterized in that the bending bar guide (33, 34) is arranged on a first frame part, in particular an O-frame (23), and the clamping beam guide (29, 45) and the transverse guide (40) are arranged on a second frame part spaced apart therefrom, in particular an O-frame (21).
7. The bending press (18) according to one of claims 1 to 6, characterized in that the bending bar guide (33) and the clamping jaw guide (29, 45) and the transverse guide (40) are arranged on opposite outsides (51, 52) of a central frame part (50), in particular an O-frame.
8. The bending press (18) according to one of the preceding claims, characterized in that on the machine frame (19) two opposite adjustable bending bars (7, 38) are arranged for angling in opposite directions.
9. The bending press (18) according to one of claims 1 to 7, characterized in that two spaced apart and mutually oriented bending bars (7, 38) are arranged on a common bar frame, in particular an O-frame, and the latter can be adjusted in a straight line by means of the bending bar guide (33).
10. The bending press (18) according to one of the preceding claims, characterized in that a horizontal distance (10) between the clamping beams (27, 28) and bending bars (7, 38) can be adjusted.
11. The bending press (18) according to one of the preceding claims, characterized in that the shaping edges (5, 6) on the clamping jaws (2, 3) are composed of tool segments in the form of clamping tools (43) and/or the bending edge (8, 39) on the bending bar (7, 38) of tool segments in the form of bending tools (37).
12. The bending press (18) according to one of the preceding claims, characterized in that in the machine frame (19) between the clamping beams (27, 28) and the bending bar or bars (7, 38) a free opening (24) for a workpiece (1) is provided from the front side (20).
13. A method for forming a workpiece (1), in which said workpiece is clamped between a first clamping jaw (2) with a first shaping edge (5) arranged on a first clamping beam (27) and a second clamping jaw (3) with a second shaping edge (6) arranged on a second clamping beam (28) in such a manner that a portion (4) projects between the shaping edges (5, 6) and afterwards a bending edge (8, 39) of an adjustable bending bar (7, 38) is guided at a distance (10) past the shaping edges (5, 6), whereby the portion (4) is angled relative to the part of the workpiece (1) clamped between the clamping jaws (2, 3), characterized in that the bending edge (8, 39) is guided on angling along a straight movement path (12) and, after the bending edge (8, 39) has passed the shaping edges (5, 6), the shaping edges (5, 6) of both clamping jaws (2, 3) are adjusted along with the clamped workpiece (1) by means of a transverse guide (40) of the clamping beams (27, 28) and an adjusting drive (41) along an adjustment path (13, 14, 17) which approaches the movement path (12) of the bending edge (8, 39).
14. The method according to claim 13, characterized in that after the bending edge (8, 39) has passed the shaping edges (5, 6), the adjusting movement of the bending edge (8, 39) is largely or completely stopped and, at the same time or immediately after, the shaping edges (5, 6) are moved closer at a right angle perpendicular to or perpendicularly over the movement path (12) of the bending edge (8, 39).
15. The method according to claim 13, characterized in that once the bending edge (8, 39) has passed the shaping edges (5, 6), the shaping edges (5, 6) are moved closer at an inclination angle (49) perpendicular to or perpendicularly over the movement path (12) of the bending edge (8, 39) and the adjusting movement of the bending edge (8, 39) coupled with the movement of the shaping edges (5, 6) is continued until the completion of the shaping process.

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