Bending machine for bending flat material and method for bending a standing seam on a flat material using the bending machine

Abstract

Bending machine for bending flat material, comprising a first clamping jaw and a second clamping jaw for clamping the flat material to be bent in a clamping plane and a first bending jaw for bending the flat material, wherein the bending machine includes a counter-holding device for exerting a counter-holding function on the flat material to be bent, which is provided in addition to the first clamping jaw and the second clamping jaw and has a counter-holding element, wherein the counter-holding element is positioned between a park position in which it is located away from the flat material to be bent and the counter-holding function cannot be exercised, and a counter-holding position in which it can be in contact with the flat material to be bent and the counter-holding function can be exercised in such a way that the counter-holding element can counteract a bending force exerted by the first bending jaw when bending the flat material about a bending axis that is spaced away from the clamping plane.applied to the flat material, is movable.

Description

I. Area of ​​application

[0001] The present invention relates to a bending machine for bending flat material and a method for bending a standing seam on a flat material using the bending machine. A bending machine within the meaning of the present invention is also referred to as a folding machine. The flat material that is bent with the bending machine according to the invention can be metallic sheets made of copper, aluminum, steel, or other metals or metal alloys. Bending non-metallic flat materials with the bending machine according to the invention is also conceivable, provided such materials are plastically deformable by bending. II. Technical background

[0002] Bending or folding machines for bending flat material are available in various designs, which differ according to the bending principle on which they are based.

[0003] On the one hand, EP 2 014 381 B1, for example, describes a bending machine in the form of a so-called swivel bending machine, in which an upper or a lower bending beam is swiveled around a bending axis to bend the flat material (hereinafter "swivel principle").

[0004] On the other hand, DE 10 2018 000 344 B3 or DE 20 2020 002 598 U1, for example, describe a bending machine in which bending tools are attached to clamping jaws, whereby the bending tools can be moved linearly in feed planes. Wedges are used to tilt the bending tools relative to a surface of the clamping jaws. The aforementioned wedges, in turn, can be moved linearly relative to the clamping jaws. The superposition of the linear movement of a bending tool in a feed plane on the one hand and the linear movement of a wedge relative to a clamping jaw on the other hand makes it possible to move the respective bending tool along a variety of trajectories (hereinafter "wedge principle").

[0005] The bending machine known from DE 20 2020 002 598 U1 enables a so-called standing seam bending mode, according to which a standing seam to be produced on the flat material is closed or bent. In this case, one of the two clamping jaws, for example the upper clamping jaw 22, is moved according to the Fig. 12 and 13 of DE 20 2020 002 598 U1, the standing seam is lifted from the clamping plane 32 of the flat material in order to exert a counter-holding force against one leg of the not yet closed standing seam. With the aid of an upper bending tool 30, the other leg of the standing seam is then pressed against, so that the standing seam is bent or closed while being counter-held by the upper clamping jaw 22. The closed state of the standing seam is shown in Fig. 14 of DE 20 2020 002 598 U1.

[0006] In the standing seam bending mode, the other leg of the standing seam is bent by a Fig. 12and 13 of DE 20 2020 002 598 U1, which is spaced from the clamping plane 32. In the first bending axis 200 in the sense of DE 20 2020 002 598 U1, which is shown in its Fig. 10 and 11 This is the standard bending axis commonly used in bending machines of the type in question, which is formed by one of the two clamping jaws 22, 24 (namely, the upper clamping jaw 22 when bending upwards, and the lower clamping jaw 24 when bending downwards). Accordingly, the first bending axis 200 lies essentially in the clamping plane 32.

[0007] The clamping jaws of known bending machines must generally be designed in such a way that they can form a standard bending axis or a first bending axis 200 as defined in DE 20 2020 002 598 U1. Suitable geometries or radii must be provided at the front ends or tips of the clamping jaws for this purpose.

[0008] These geometric constraints, which the clamping jaws must adhere to, are disadvantageous when used to hold the leg of a standing seam being closed. For example, the relatively small radii at the front end or tip of the clamping jaw can cause undesirable marks on the surface of the leg of the standing seam, which the clamping jaw is used to hold.

[0009] A free design of the geometry of the clamping cheek solely from the point of view of avoiding impressions of the aforementioned type when holding against a leg of a standing seam is not possible, since the clamping cheek must also be able to perform its standard main function, namely the function of forming the first bending axis 200 within the meaning of DE 20 2020 002 598 U1. III. Description of the invention a) Technical task

[0010] It is therefore the object of the present invention to provide a bending machine for bending flat material and a method for bending a standing seam on a flat material using the bending machine, which makes it possible to achieve the counter-holding against a leg of a standing seam to be closed or bent completely independently of the geometric boundary conditions which are predetermined by the design of a clamping cheek which is intended to form a standard bending axis or first bending axis within the meaning of DE 20 2020 002 598 U1. b) Solution to the task

[0011] This object is achieved by means of a bending machine having the features of claim 1 or by means of a method having the features of claim 15. Further embodiments of the present invention emerge from the subclaims.

[0012] According to the invention, a bending machine for bending flat material is proposed, comprising a first clamping jaw and a second clamping jaw for clamping the flat material to be bent in a clamping plane, and a first bending jaw for bending the flat material. The flat material can be metallic sheet metal or flat material made of non-metallic materials that are plastically deformable by bending.

[0013] Optionally, it is conceivable to provide a second bending beam for bending the flat material in addition to the first bending beam in a conventional manner. The bending machine according to the invention can accordingly be designed as a so-called single bending beam (only a single bending beam is provided for bending the flat material either upwards or downwards) or as a so-called double bending beam (two bending beams are provided, with an upper bending beam for bending the flat material downwards and a lower bending beam for bending the flat material upwards).

[0014] According to the invention, the bending machine comprises a counterholding device for performing a counterholding function on the flat material to be bent, wherein the counterholding device is present both in addition to the first clamping jaw and the second clamping jaw, as well as in addition to the first bending jaw and any second bending jaw provided. The counterholding device has a counterholding element that can be moved back and forth between a parked position and a counterholding position. In the parked position, the counterholding element is arranged away from the flat material to be bent, and the counterholding function cannot be performed.In the counter-holding position, the counter-holding element can be in contact with the flat material to be bent and its counter-holding function can be exerted in such a way that it can counteract a bending force which is applied to the flat material by means of the first bending beam when the flat material is bent about a bending axis which is spaced from the clamping plane.

[0015] The advantage of the bending machine according to the invention is that the design of the counter-holding element of the counter-holding device can be aligned exclusively to the requirements of the counter-holding itself, completely unaffected by the geometric requirements of the two clamping cheeks. In particular, it is possible to avoid marks on the leg of a standing seam and / or to achieve the largest possible contact between the counter-holding element and the flat material during counter-holding. This not only allows the counter-holding force to be distributed over the largest possible area, but also makes it possible to make the process of bending a not yet fully closed standing seam more mechanically stable, since the leg of the standing seam, against which the counter-holding element is held, can be supported over a larger proportion of its total surface.

[0016] In the bending machine according to the invention, the two clamping jaws exclusively perform their conventional function of clamping the flat material to be bent in a clamping plane and forming a conventional standard bending axis or first bending axis as defined in DE 20 2020 002 598 U1. The two clamping jaws of the bending machine according to the invention are not involved in a counter-holding function, particularly in connection with the bending of a standing seam.

[0017] As already mentioned, the bending machine according to the invention can be designed as a single-bender or a double-bender. Furthermore, the bending machine according to the invention can be designed as a swivel bending machine according to the "swivel principle" mentioned above or as a bending machine according to the "wedge principle" mentioned above.

[0018] Advantageously, the counterholding device can be mounted on a machine frame of the bending machine. The machine frame can comprise a machine upper part and a machine lower part, which are movable relative to one another. The counterholding device is preferably mounted on the machine upper part.

[0019] Advantageously, the counterholding element can have a counterholding surface and / or a counterholding line for contact with the flat material to be bent. In particular, the counterholding line can be designed in a curved manner such that the counterholding function provides mechanical stabilization of a not yet fully closed standing seam during the bending process. The counterholding element is preferably designed as an elongated counterholding strip. The counterholding surface can then be designed, for example, as an elongated rectangular surface.

[0020] Advantageously, the counterholding device comprises at least one support arm to which the counterholding element is attached so that it can be supported. Preferably, particularly when the counterholding element is configured as an elongated counterholding strip, the counterholding device comprises a plurality of support arms that jointly support the counterholding element at a plurality of spaced-apart locations.

[0021] Advantageously, the at least one support arm can be moved back and forth along a guide device between a first end position and a second end position. The first end position corresponds to the parking position of the counterholding element, and the second end position corresponds to the counterholding position of the counterholding element. The guide device enables movement of the support arm transversely to a longitudinal direction of the bending machine.

[0022] Preferably, the counterholding device comprises an adjustment device for adjusting a relative position of at least the second end position of the support arm relative to the guide device. By means of the adjustment device, it is at least possible to adjust the support arm in its second end position to a stop position defined by a stop of the guide device.

[0023] The adjustment device essentially allows the spatial position of the counter-holding position of the counter-holding element to be adjusted within the available guide path of the guide device. For example, the relative position of the second end position of the support arm relative to the guide device can be adjusted such that the second end position is still before the stop position.

[0024] It is also conceivable that not only the relative position of the second end position of the support arm relative to the guide device is adjustable, but also the relative position of the first end position of the support arm, corresponding to the parking position, relative to the guide device. However, since the counterholding element is nonfunctional in its parking position, i.e., it does not perform a counterholding function, the exact spatial position of the counterholding element in its parking position is no longer relevant.

[0025] The first end position and the second end position of the support arm mark the two end points of its movement path along the guide device, between which the support arm can be moved back and forth when the counterholding element is moved between the parking position and the counterholding position. In the second end position, the support arm is preferably in the aforementioned stop position. This has the advantage that the counterholding element is held in its counterholding position with greater mechanical stability overall than is the case when the second end position is still before the stop position. This advantage of more mechanically stable holding can be further increased if the support arm is pressed into the stop position with a stop force tailored to the counterholding forces to be applied.

[0026] Advantageously, the stop can be adjustable relative to the machine frame or to the machine head. In this case, adjusting means are provided for adjusting the stop, so that the spatial position of the counterholding element in its counterholding position can be adjusted with the support arm in the respective stop position. For example, it is conceivable to design the guide device comprising the stop to be adjustable relative to the machine frame or to the machine head. In this case, the adjusting means are designed such that their actuation allows the entire guide device to be adjusted relative to the machine frame or to the machine head.

[0027] The adjustment device can advantageously be a conventional turnbuckle. This allows for simple yet precise adjustment of the relative position of the second end position of the support arm relative to the guide device, particularly when the second end position of the support arm is still before the stop position.

[0028] Advantageously, the guide device can be designed as a slotted guide and comprise at least one guide plate that is attached to the machine frame or to the machine head. Preferably, the guide device designed as a slotted guide has two guide plates, and the support arm is arranged at least partially between the guide plates for guiding the support arm between the first end position and the second end position.

[0029] In the guide device designed as a sliding guide, the at least one guide plate or the support arm can have two sliding guide tracks, in particular two elongated holes, for defining a sliding guide path. At least two sliding blocks are then attached to the support arm or to the at least one guide plate, each of which is positively guided in one of the two sliding guide tracks. Accordingly, the support arm is movable in a spatially defined orientation along the sliding guide path between its first end position and its second end position.

[0030] In the case of two guide plates, a total of four slide tracks, two on each of the two guide plates, and a total of four slide blocks, two on each side of the support arm, can advantageously be provided for guiding the support arm.

[0031] The guide device can also be designed as a track guide with at least one track rail that is attached to the machine frame or to the machine head, with the support arm being movable like a carriage along the track rail between its first end position and its second end position. The track rail can be curved in coordination with the feed movement of the counterholding element from its parking position to its counterholding position. The track guide is then a curved track guide.

[0032] Preferably, the counterholding device can have at least one drive element for moving the support arm. The drive element can be, for example, an electric servomotor, a hydraulic cylinder, or a pneumatic cylinder.

[0033] Advantageously, the aforementioned adjustment device can be arranged in a force transmission path between the drive element on the one hand and the support arm on the other, such that it itself participates in the force transmission between the drive element and the support arm. This eliminates the need for a separate adjustment device, which would be present in addition to the elements of the force transmission path, in a space- and cost-saving manner.

[0034] Preferably, the bending machine has a plurality of support arms, i.e., two or more, which jointly support the counter-holding element. The counter-holding device comprises a shaft, at least one first lever, which is connected to the shaft in a rotationally fixed manner, and a plurality of second levers, i.e., two or more, which are each connected to the shaft in a rotationally fixed manner and are each assigned to one of the plurality of support arms.

[0035] In this context, the first lever is operatively connected to the drive element at a point spaced from the shaft, and the second levers are each operatively connected to the respective support element at a point spaced from the shaft. This ensures that, by actuating the drive element, a torque can be transmitted to the first lever, from the first lever to the shaft, and from the shaft to the plurality of second levers, and an actuating force can be applied to the respective support arm in order to move it between its first end position and its second end position. The shaft acts as a synchronizing shaft, which synchronizes the rotary movements of the plurality of second levers and thus the movements of the plurality of support arms.

[0036] The aforementioned adjustment device can be arranged, for example, between the drive element and the first lever. It then enables a joint adjustment of the second end positions of the plurality of support arms. It is preferred to assign each of the plurality of support arms its own adjustment device for adjusting the relative position of at least the second end position of the respective support arm relative to the respective guide device. The respective adjustment device can then be arranged, for example, between the respective second lever and the respective support arm. It then transmits the actuating force for moving the respective support arm from the respective second lever to the respective support arm.

[0037] The present invention also proposes a method for bending a standing seam on a flat material using a bending machine having a first clamping jaw and a second clamping jaw for clamping the flat material to be bent in a clamping plane and a first bending jaw for bending the flat material, wherein the bending machine comprises a counterholding device for exerting a counterholding function on the flat material to be bent, which is present in addition to the first clamping jaw and the second clamping jaw and has a counterholding element, wherein the counterholding element can be moved between a parking position, in which it is arranged away from the flat material to be bent and the counterholding function cannot be exerted, and a counterholding position in which it can be in contact with the flat material to be bent and the counterholding function can be exerted such that the counterholding element can counteract a bending force,which is movable by means of the first bending beam when bending the flat material around a bending axis which is spaced from the clamping plane, and is applied to the flat material.

[0038] The method according to the invention comprises the following steps: a) moving the counterholding element from the parking position into the counterholding position in which it is spaced from the clamping plane and can support a first leg (S1) of the standing seam that is not to be bent, b) bending the standing seam about the bending axis by applying the bending force to a second leg (S2) of the standing seam that is to be bent by means of the first bending cheek (4), and c) counterholding against the bending force during step b) by contacting the first leg (S1) that is not to be bent by means of a counterholding surface or a counterholding line of the counterholding element (6) and thereby supporting it. c) Example of implementation

[0039] An exemplary embodiment of the bending machine according to the invention and the method according to the invention is described below with reference to the accompanying drawings. They show: Fig. 1: a perspective view of an embodiment of the bending machine according to the invention, viewed from the operator's side; Fig. 2: a view of a part of the Fig. 1 shown bending machine with view in Fig. 1 from the left rear; Fig. 3: a perspective view of a part of the embodiment of the bending machine according to the invention according to Fig. 1 in the direction of Fig. 1 from the left rear, showing various elements of the counter-holding device; Fig. 4: an enlarged detailed view of Fig. 3; Fig. 5: a perspective view of a counter-holding device of the bending machine according to the invention with four support arms without other components of the bending machine; Fig. 6: a perspective view of a part of the Fig. 5 shown counterholding device, which shows the mechanism between the shaft and the counterholding element, wherein the guide plates for guiding the support arm shown have been omitted; Fig. 7: a sectional or side view according to the arrows AA in Fig. 2 , wherein the support arm is in its first end position and the counter-holding element is in its parking position; Fig. 8: a sectional or side view according to the arrows AA in Fig. 2, wherein the support arm is in its second end position and the counter-holding element is in its counter-holding position; Fig. 9: an enlarged sectional view of the two clamping cheeks, the first bending cheek and the counter-holding element in preparation for bending a standing seam on a flat material; Fig. 10: a sectional view corresponding Fig. 9 , wherein the first bending beam is in its initial bending position; Fig. 11: a sectional view corresponding to the Figs. 9 and 10 , wherein the first bending beam is shown while it is bending the standing seam; and Fig. 12: a sectional view corresponding to Fig. 9 to 11 , whereby the first bending beam has completely bent the standing seam.

[0040] In the drawings, like reference symbols identify like elements or parts or functionally corresponding elements or parts.

[0041] Fig. 1shows an embodiment of a bending machine 1 according to the invention for bending metallic or non-metallic flat material, which is designed as a so-called double bender with a first bending beam 4 arranged at the top here and a second bending beam 22 arranged at the bottom here. Alternatively, the bending machine 1 could also be designed as a single bender with only one of the two bending beams 4 and 22. As is known for machines of this type, the elongated bending beams 4 and 22 extend in the longitudinal direction L of the bending machine 1. As is also known for machines of this type, the machine operator stands in front of the bending machine 1 in a transverse direction Q of the bending machine 1, which runs perpendicular to the longitudinal direction L and horizontally.

[0042] In the illustrated embodiment, the bending machine 1 has a total of six force application sections 23, with the aid of which bending forces for bending the flat material can be applied to the bending beams 4 and 22 in a known manner. The force application sections 23 can transmit the bending forces to the bending beams 4 and 22 according to the "pivoting principle" mentioned above or according to the "wedge principle" mentioned above. The design of the possible force transmission mechanisms in the force application sections 23 is well known to those skilled in the art from the prior art and will therefore not be explained further here.

[0043] In this context, express reference is made to EP 2 014 381 B1 ("pivoting principle") and to DE 10 2018 000 344 B3 or DE 20 2020 002 598 U1 ("wedge principle") in order to include their disclosure concerning force transmission mechanisms in force introduction sections of the type in question as a disclosure for possible designs of the force transmission mechanism in the force introduction sections 23 in the present disclosure.

[0044] The bending machine 1 shown with its six force application sections 23 is also referred to as a long bending machine.

[0045] The person skilled in the art will also know that bending machines of the type in question, both in the form of double benders and in the form of single benders, always have two clamping jaws for clamping the flat material to be bent in a clamping plane. Fig. 1In its left area, only a small part of a first clamping cheek 2, located above the clamping plane, can be seen. A second clamping cheek 3, located below the clamping plane, is Fig. 1 not recognizable. It is in the Fig. 7 to 12 to see.

[0046] In particular, the Fig. 2 to 6 show a counter-holding device 5 for performing a counter-holding function on the flat material to be bent (cf. Fig. 5 ) or individual components thereof (cf. Fig. 2 to 4 and 6 ).

[0047] In Fig. 5 A counterholding device 5 is shown for performing the counterholding function on the flat material to be bent. In order not to make details in the drawing too small, Fig. 5 a counter-holding device 5 is shown which is shorter than the one used in the bending machine 1 according to Fig. 1is used. In the embodiment shown, it comprises a pneumatic cylinder 17, which acts as the drive element. A drive rod 24 of the pneumatic cylinder 17 is connected to a first lever 20, which in turn is connected in a rotationally fixed manner to a shaft 19. On the shaft 19, Fig. 5 A total of four second levers 21 are arranged, each of which is connected in a rotationally fixed manner to the shaft 19.

[0048] Instead of the pneumatic cylinder 17, the drive element can also be designed in the form of an electric servomotor or a hydraulic cylinder. As the length of the bending machine 1 increases in the longitudinal direction L, two or more drive elements can be arranged at a distance in the longitudinal direction L, if necessary.

[0049] In the detailed representation according to Fig. 6is shown as an example how one of the second levers 21 is seated on the shaft 19 in a rotationally fixed manner. At its end facing away from the shaft 19, the lever 21 is hinged to an adjustment device, which in the embodiment shown is designed as a known turnbuckle 18. The adjustment function of the turnbuckle 18 will be described later. At its end facing away from the lever 21, the turnbuckle 18 is hinged to a support arm 10, which here is designed flat in the manner of a plate. At the end shown in Fig. 6 A counter-holding element in the form of a counter-holding bar 6 is attached to the support arm 10 shown. A retaining clip 7 is used for this purpose. Fig. 5 The counter-holding bar 6 is carried or held by a total of four support arms 10.

[0050] Each of the support arms 10 is movable between a first end position and a second end position by means of a guide device. In the embodiment shown, the guide device is formed by a slotted guide and comprises two guide plates 11, 12, which are best Fig. 4 can be seen. The guide plates 11, 12 are arranged parallel to one another and form a space between them in which the respective support arm 10 is at least partially received.

[0051] For better visibility of the support arm 10, the guide plates 11, 12 are Fig. 6 Not shown in the drawing. In the embodiment shown, each of the two guide plates 11, 12 has two guide tracks, for example in the form of two elongated holes 13, 14. As best seen in Fig. 6As can be seen, the support arm 10 has two sliding blocks on each of its sides, here in the form of two rotatably mounted sliding rollers 15, 16. The sliding rollers 15, 16 have a Fig. 6 The groove can be seen in the figure, into which the contour edges of the slots 13, 14 can engage. Fig. 6 The support arm 10 shown is accordingly equipped with a total of four guide rollers 15, 16, of which only three are visible.

[0052] In the embodiment shown, the guide plates 11, 12 are firmly connected to a machine upper part 8 (see Fig. 1 , 2 and 3 ) which extends in the longitudinal direction L over the entire length of the bending machine 1. The machine upper part 8 is in a known manner relative to the Fig. 1marked machine base 9, so that the clamping cheeks 2, 3 can be moved towards each other in a known manner to clamp the flat material and away from each other to release the flat material.

[0053] The fixed connection of the guide plates 11, 12 with the machine head 8 is achieved by means of holders, which are fastened on the one hand to the machine head 8 and on the other hand to the respective guide plate 11 or 12. Fig. 2 and 3 Holders 25 can be seen, which firmly connect the guide plate 12 to the machine head 8. Corresponding holders are also provided for fastening the guide plate 11 to the machine head 8, but are not shown in the drawings. Mounting brackets 26 are used to fasten the holders 25 to the guide plates 11, 12, which are best seen in the Fig. 3 and 5 can be recognized.

[0054] As in the Fig. 2 to 6As shown, the shaft 19 is supported in several shaft bearings 27. Some of these shaft bearings 27 are attached to the guide plates 11, 12. Others of these shaft bearings 27 are firmly connected to the machine head 8 by means of mounting flanges 28.

[0055] How best to Fig. 2 , 3 and 4 As can be seen, the pneumatic cylinder 17 is supported on a support element 29, which here is designed as an elongated square profile. The support element 29 is in turn attached to the machine upper part 8.

[0056] In the embodiment shown, the entire counter-holding device 5, which is in Fig. 5 can be seen, together with the machine head 8. The support element 29, the fastening flanges 28 (see Fig. 2 to 4), the shaft bearings 27, the guide plates 11, 12, and the mounting brackets 26 are not movable at all relative to the machine head 8. Components of the counterholding device 5 that are movable relative to the machine head 8 are the pneumatic cylinder 17 (slight pivoting movement), the drive rod 24, the first lever 20, the shaft 19 (only rotational, not translational), the second lever 21, the turnbuckles 18, the support arms 10 with their guide rollers 15, 16, and the counterholding bar 6.

[0057] Figs. 7 and 8 show sectional and side views in the direction of the arrows AA in Fig. 2 For reasons of clarity, the Figs. 7 and 8 those parts are omitted which are not relevant for the functionality to be described.

[0058] Fig. 7 shows one of the support arms 10 in a first end position, in which it is bent according to the bent course of the elongated holes 13, 14 in Fig. 7 furthest to the right and furthest to the top. In the first end position of the support arm 10, the counter-holding bar 6 is in a parked position in which it is arranged particularly horizontally away from a flat material F to be bent and cannot perform a counter-holding function on the flat material F. In its parked position, the counter-holding bar 6 is particularly separated from the front or in Fig. 7 left ends of the clamping cheeks 2, 3.

[0059] When the counter-holding bar 6 is in the parking position, the clamping cheeks 2, 3 can thus freely perform their conventional clamping function, in which they clamp the flat material F between them in a clamping plane E and thereby securely hold it for planned bending operations. To perform this conventional clamping function, Fig. 7 the upper clamping jaw 2 is moved downwards in order to clamp the flat material F in the clamping plane E.

[0060] In the first end position of the support arm 10 or in the parking position of the counter-holding bar 6, which is Fig. 7 As shown, the drive rod 24 of the pneumatic cylinder 17 is in its fully retracted position. Accordingly, the lever 20 is in a rotational position corresponding to its end position in the clockwise direction.

[0061] In Fig. 8 is the one in Fig. 7 The support arm 10 shown in the drawing is shown in a second end position, in which it is bent according to the bent course of the elongated holes 13, 14 in Fig. 8 is located furthest to the left and furthest down. When the support arm 10 is moved from its Fig. 7 shown first end position into its Fig. 8 In the second end position shown, the counter-holding bar 6 has moved from its Fig. 7 shown parking position into one in Fig. 8shown counter-holding position. In its counter-holding position, the counter-holding bar 6 can come into contact with or stand on the flat material F to be bent and support it during a bending process.

[0062] In Fig. 8 It is shown how the counter-holding bar 6 from the right counter-holds against an already completely bent or completely closed standing seam of the flat material F. In the counter-holding position according to Fig. 8 the counter-holding bar 6 can thus perform its counter-holding function as intended.

[0063] As in Fig. 8 As can be seen, the drive rod 24 of the pneumatic cylinder 17 has been fully extended to move the support arm 10 to its second end position. The lever 20, which transmits the drive force of the drive rod 24 to the shaft 19, is accordingly in a rotational position corresponding to its counterclockwise end position. Furthermore, Fig. 8the pneumatic cylinder 17 compared to its position in Fig. 7 slightly rotated counterclockwise.

[0064] In the Fig. 9 to 12 a method for bending a standing seam on the flat material F using the bending machine 1 according to the invention is illustrated. Fig. 9 to 12 only the upper bending beam 4 is shown. Since the bending machine 1 is designed as a double bender, it also has the Fig. 1 lower bending beam 22, which is located in the Fig. 9 to 12 was omitted from the drawing.

[0065] If required, the bending beams 4, 22 can have separate bending segments in a known manner at their ends that come into contact with the flat material F during bending, and possibly additional additional bending segments that are detachably mounted at these ends. Such bending segments or additional bending segments are not present in the illustrated embodiment and are not shown in the Fig. 9 to 12therefore not shown.

[0066] Similarly, the clamping cheeks 2, 3 can, if required, have separate clamping segments at their ends which come into contact with the flat material F when clamped in the clamping plane E, which are detachably mounted at these ends. Such clamping segments are also not present in the illustrated embodiment and are not shown in the Fig. 9 to 12 therefore not shown.

[0067] In Fig. 9 The flat material F is shown in a pre-bent state, in which it has an open, ie not yet bent, standing seam. Fig. 9To achieve the state shown for the flat material F, it was bent twice in a conventional manner. To produce a leg S 2, a bend of 135° from top to bottom was first made using the bending beam 4. Subsequently, after shifting the flat material F within the clamping plane E, a leg S 1 was produced using the bending beam 4 shown in Fig. 9 not shown, lower bending beam 22, another bend by 90° from bottom to top. By means of these two bending processes, the Fig. 9 The open standing seam shown was created with the first leg S 1 and the second leg S 2, which have an opening angle of 45° between them. During the two previous bending processes, the flat material F was clamped between the upper clamping jaw 2 and the lower clamping jaw 3 in the clamping plane E.

[0068] The process for bending the standing seam consists in bending the leg S 2 counterclockwise by 45° in the direction of the leg S 1. During this bending process, the bending axis B is located in a known manner at the Fig. 9 upper tip of the standing seam, ie essentially in the intersection line of the legs S 1 and S 2 .

[0069] As can be seen, this bending axis B is not located in the clamping plane E, but is spaced upwards from it essentially by the length of the leg S 1.

[0070] Before the bending of the standing seam in the aforementioned sense is started, the pneumatic cylinder 17 is actuated in such a way that it extends its drive rod 24 and moves the lever 20 into its Fig. 8 This causes a rotational movement in the Figs. 7 and 8counterclockwise torque is transmitted to the shaft 19. The resulting rotating shaft 19 transmits this torque to the multiple levers 21, so that each of the levers 21 moves the associated support arm 10 from its Fig. 7 shown first end position into its Fig. 8 shown second end position. Accordingly, the counter-holding bar 6 held by the support arms 10 moves from its Fig. 7 shown parking position into its Fig. 8 shown counter-holding position.

[0071] When the respective support arm 10 is pressed by means of the respective lever 21, the transmission of the required actuating force to the support arm 10 takes place via the turnbuckle 18. After this feed movement, the counter-holding bar 6 is in its Fig. 9 to 12 shown counter-holding position.

[0072] In the embodiment shown, the counter-holding element consists of an elongated counter-holding bar 6 with a rectangular cross-section, which is best suited to the Fig. 9 to 12 can be seen. The counter-holding bar 6 is firmly connected to the respective support arm 10 via the retaining clip 7. As shown in Fig. 9 to 12 As can be seen, the counter-holding bar 6 rests against the leg S 1 with the short side of its rectangular cross-section from the right. Accordingly, the counter-holding bar 6 rests against the leg S 1 along a flat support band, the width of which here corresponds to the length of the short side of the rectangle, over the entire length of the standing seam running in the longitudinal direction L of the bending machine 1.

[0073] Depending on requirements, the short side of the rectangular cross-section of the counter-holding strip 6 can also be made longer than shown in the present embodiment. This would then result in a wider, flat contact strip, which distributes the counter-holding force over an even larger area and thus even better prevents unwanted marks on the Fig. 9 right side of the leg S1. Since the formation of a flat contact band is independent of the overall geometry of the cross section of the counter-holding strip 6, the cross section of the counter-holding strip 6 can of course also have a cross-sectional shape other than a rectangle, for example a square shape, triangular shape, trapezoidal shape, hexagonal shape or the like.

[0074] To bend the standing seam, the bending beam 4 is first released from its Fig. 9 shown position in the Fig. 10In this bending start position, the bending beam 4 is positioned as shown in Fig. 10 shown on the leg S 2. A bending force is not yet exerted on the leg S 2 in the initial bending position of the bending beam 4.

[0075] The bending beam 4 is then further moved into the Fig. 11 During the movement from the position shown in Fig. 10 shown bending start position into the Fig. 11 In the intermediate position shown, the bending beam 4 applies a bending force to the leg S 2, which bends it counterclockwise around the bending axis B in the direction of the leg S1.

[0076] Starting from the intermediate position according to Fig. 11 the bending beam 4 is finally moved further until it reaches its Fig. 12The end bending position shown is reached, in which the standing seam is completely bent or closed. The overlapping lengths of the legs S 1 and S 2 then essentially lie against each other or run essentially parallel to each other. Fig. 12 The finished standing seam can be seen here. It can also be seen in the bottom left corner of Figs. 7 and 8 to see.

[0077] During the process of bending the leg S 2 from its Fig. 10 shown bending start position into its Fig. 12 In the final bending position shown, the bending force applied by the bending beam 4 to the leg S 2 tends to bend the other leg S 1 clockwise. This is precisely what is prevented by the counter-holding bar 6, which counteracts the aforementioned bending force. Neither the upper clamping beam 2 nor the lower clamping beam 3 are involved in this counter-holding process, in which Fig. 10 to 12from the right. The clamping jaws 2 and 3 of the bending machine 1 can be designed in the same way as those of conventional bending machines or long-edge bending machines, which have long been known from the prior art. The geometry of the counter-holding bar 6, in particular the geometry of the contact surface or a contact line between the counter-holding bar 6 and the leg S 1 , can be designed exclusively according to the requirements of the counter-holding function.

[0078] In the embodiment shown, the support arms 10 are in their respective second end position according to Fig. 8 in a stop position. In this stop position, the cam rollers 15, 16 rest on stops 30, 31, which are in the Fig. 3 and 7 are marked and are protected by the Figs. 7 and 8 left ends of the elongated holes 13, 14.

[0079] The spatial position of the second end position of the respective support arm 10 is determined by the maximum stroke of the drive rod 24 of the pneumatic cylinder 17. By turning the turnbuckle 18, the distance between the lever 21 and the support arm 10 (see Fig. 6 ) can be changed or adjusted in such a way that the link rollers 15, 16 rest against the stops 30, 31 in the second end position of the respective support arm 10 and are pressed against the stops 30, 31 with a certain stop force.

[0080] The stop force can thus be adjusted by turning the turnbuckle 18 depending on the counter-holding forces to be applied in each specific case. The counter-holding bar 6 is thus held in its counter-holding position with particularly high mechanical stability over its entire length during the counter-holding action.

[0081] In addition, the adjustment device, which in the illustrated embodiment is designed as a turnbuckle 18, makes it possible to set a second end position of the respective support arm 10 in which it does not assume its stop position, but rather, after the maximum stroke of the drive rod 24, already remains at a position before reaching the stop position. The link rollers 15, 16 then do not rest against the stops 30, 31 and consequently have no contact with them. In this way, it is fundamentally possible to set a second end position of the support arm 10 that deviates from the stop position, which leads to a counter-holding position of the counter-holding bar 6 that deviates from the counter-holding position of the counter-holding bar 6 assigned to the stop position of the support arm 10.

[0082] If, as in the illustrated embodiment, the stop position of the respective support arm 10 is provided as the second end position, the spatial position of the counter-holding bar 6 in its counter-holding position is determined by the stop position. The relative position of the counter-holding position relative to the stop position cannot be changed by means of the turnbuckle 18.

[0083] In order to be able to adjust the spatial position of the counter-holding bar 6 in its counter-holding position in this case, depending on the counter-holding requirements, the shaft bearings 27, the shaft 19, and the guide plates 11, 12 can be adjustably mounted on the machine head 8 relative to the latter. To adjust the shaft bearings 27, the shaft 19, and the guide plates 11, 12, for example, adjusting means in the form of adjusting screws can be provided on the ends of the guide plates 11, 12 facing away from the counter-holding bar 6 and / or on the shaft bearings 27. Alternatively or additionally, it is conceivable in this context to attach the counter-holding bar 6 to the support arms 10 so that it can be adjusted relative to the latter and to provide adjusting screws for adjusting the counter-holding bar 6. LIST OF REFERENCE SYMBOLS

[0084] 1 Bending machine 2 First clamping jaw 3 Second clamping jaw 4 First bending jaw 5 Counterholding device 6 Counterholding element, counterholding bar 7 Holding clamp for attaching the counterholding bar 6 to the support arm 10 8 Machine upper section 9 Machine lower section 10 Support arm 11 Guide plate 12 Guide plate 13 Slide track, slotted hole 14 Slide track, slotted hole 15 Slide block, slide roller 16 Slide block, slide roller 17 Drive element, servo motor 18 Adjustment device, turnbuckle 19 Shaft 20 First lever 21 Second lever 22 Second bending jaw 23 Force application sections 24 Drive rod of the drive element 17 25 Holder for holding the guide plate 12 26 Mounting bracket for attaching the holder 25 27 Shaft bearing 28Mounting flange for attaching shaft bearings 27 to the machine head 8 29Support element for supporting the drive element 17 30Stop of the slot 13 31Stop of the slot 14 BBending axis EEngagement plane FFlat material LLongitudinal direction of the bending machine 1 QTransverse direction of the bending machine 1 S 1 First leg of the standing seam S 2 Second leg of the standing seam

Claims

1. Bending machine (1) for bending flat material (F), comprising • a first clamping jaw (2) and a second clamping jaw (3) for clamping the flat material (F) to be bent in a clamping plane (E) and • a first bending jaw (4) for bending the flat material (F), characterized in thatthe bending machine (1) comprises a counter-holding device (5) for performing a counter-holding function on the flat material (F) to be bent, which counter-holding device is present in addition to the first clamping cheek (2) and the second clamping cheek (3) and has a counter-holding element (6), wherein the counter-holding element (6) is movable between a parking position, in which it is arranged away from the flat material (F) to be bent and the counter-holding function cannot be performed, and a counter-holding position in which it can be in contact with the flat material (F) to be bent and the counter-holding function can be performed such that the counter-holding element (6) can counter-hold a bending force which is applied to the flat material by means of the first bending cheek (4) when the flat material (F) is bent about a bending axis (B) which is spaced from the clamping plane (E).

2. Bending machine according to claim 1, characterized in thatthe counter-holding device (5) is mounted on a machine frame of the bending machine (1).

3. Bending machine according to claim 2, characterized in that the machine frame comprises a machine upper part (8) and a machine lower part (9) which are movable relative to one another, and the counter-holding device (5) is mounted on the machine upper part (8).

4. Bending machine according to one of the preceding claims, characterized in that the counter-holding element, in particular in the form of a counter-holding strip (6), has a counter-holding surface and / or a counter-holding line for contact with the flat material (F) to be bent.

5. Bending machine according to one of the preceding claims, characterized in that the counter-holding device (5) has at least one support arm (10) to which the counter-holding element (6) is fastened.

6. Bending machine according to claim 5, characterized in thatthe support arm (10) is movable along a guide device (11, 12, 13, 14) between a first end position and a second end position, wherein the first end position corresponds to the parking position of the counter-holding element (6) and the second end position corresponds to the counter-holding position of the counter-holding element (6).

7. Bending machine according to one of claims 6, characterized in that the counter-holding device (5) comprises an adjusting device (18) for adjusting a relative position of at least the second end position of the support arm (10) relative to the guide device (11, 12, 13, 14), so that it is at least adjustable that the support arm (10) in its second end position is in a stop position which is defined by a stop (30, 31) of the guide device (11, 12, 13, 14).

8. Bending machine according to claim 7, characterized in that the adjustment device is a turnbuckle (18).

9. Bending machine according to claim 7 or 8, characterized in thatthe stop (30, 31) is adjustable relative to the machine frame or to the machine head (8) and adjusting means for adjusting the stop (30, 31) are provided, so that a spatial position of the counter-holding element (6) in its counter-holding position can be adjusted when the support arm (10) is in the stop position.

10. Bending machine according to one of claims 6 to 9 in conjunction with claim 2 or 3, characterized in thatthe guide device (11, 12, 13, 14) is designed as a slotted guide and comprises at least one guide plate (11, 12) which is fastened to the machine frame (7) or to the machine head (8), wherein the at least one guide plate (11, 12) or the support arm (10) has two slotted tracks (13, 14), in particular elongated holes, for defining a slotted guide path, and wherein at least two slotted blocks (15, 16) are attached to the support arm (10) or to the at least one guide plate (11, 12), which are each positively guided in one of the two slotted tracks (13, 14), so that the support arm (10) can be moved in a spatially defined orientation along the slotted guide path between its first end position and its second end position.

11. Bending machine according to one of claims 6 to 9 in conjunction with claim 2 or 3, characterized in thatthe guide device is designed as a track guide with at least one track rail which is fastened to the machine frame (7) or to the machine upper part (8), wherein the support arm (10) is movable in the manner of a carriage along the track rail between its first end position and its second end position.

12. Bending machine according to one of claims 6 to 11, characterized in that the counter-holding device (5) has at least one drive element (17) for moving the support arm (10).

13. Bending machine according to claim 12 in conjunction with claim 8 or 9, characterized in that the adjusting device (18) is arranged in a force transmission path between the drive member (17) and the support arm (10) in such a way that it itself participates in the force transmission between the drive member (17) and the support arm (10).

14. Bending machine according to claim 12 or 13, characterized in thatthe bending machine (1) has a plurality of support arms (10) which jointly support the counter-holding element (6), wherein the counter-holding device (5) comprises a shaft (19), at least one first lever (20) which is connected in a rotationally fixed manner to the shaft (19), and a plurality of second levers (21), each of which is connected in a rotationally fixed manner to the shaft (19) and is each assigned to one of the plurality of support arms (10), and wherein the first lever (20) is operatively connected to the drive element (17) at a point spaced from the shaft (19), and the second levers (21) are each operatively connected to the respective support element (10) at a point spaced from the shaft (19), such that by actuating the drive element (17), a torque can be transmitted to the first lever (20), the shaft (19), and the plurality of second levers (21), and an actuating force can be applied to the respective support arm (10).

15. Method for bending a standing seam on a flat material (F) using a bending machine having a first clamping jaw (2) and a second clamping jaw (3) for clamping the flat material (F) to be bent in a clamping plane (E) and a first bending jaw (4) for bending the flat material (F), wherein the bending machine (1) comprises a counterholding device (5) for exercising a counterholding function on the flat material (F) to be bent, which is present in addition to the first clamping jaw (2) and the second clamping jaw (3) and has a counterholding element (6), wherein the counterholding element (6) can be moved between a parking position, in which it is arranged away from the flat material (F) to be bent and the counterholding function cannot be exercised, and a counterholding position, in which it can be in contact with the flat material (F) to be bent and the counterholding function can be exercised in such a way that the counterholding element (6) counteracts a bending force can counter,which is applied to the flat material (F) by means of the first bending beam (4) during bending of the flat material (F) about a bending axis (B) which is spaced from the clamping plane (E), the method comprising the following steps: a) moving the counter-holding element (6) from the parking position into the counter-holding position, in which it is spaced from the clamping plane (E) and can support a first leg (S1) of the standing seam that is not to be bent, b) bending the standing seam about the bending axis (B) by applying the bending force to a second leg (S2) of the standing seam that is to be bent by means of the first bending beam (4), and c) counter-holding against the bending force during step b) by contacting the first leg (S1) that is not to be bent by means of a counter-holding surface or a counter-holding line of the counter-holding element (6) and thereby supporting it.

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