Bending equipment with bend compensation

Abstract

The present invention relates to a bending device for producing a component by changing the shape of a workpiece made of sheet metal, the bending device comprising a press table and a press rod disposed opposite and parallel to the press table, the press rod being adjustable relative to the press table in a direction perpendicular to the longitudinal extension of the press table by means of a drive device, wherein the press table comprises a body, an adjustment rod with a tool holder, and an actuator arranged between the body and the adjustment rod for elastically changing the shape of the adjustment rod relative to the body. A slotted recess extending parallel to the longitudinal extension of the press table and open toward the press rod is formed in the body, wherein the adjustment rod is accommodated in this recess of the body, and the actuator is arranged between the underside of the adjustment rod and the bottom of the recess of the body.

Description

Technical Field

[0001] The invention relates to a bending device for manufacturing components by changing the shape of a workpiece. Background Art

[0002] A fundamental criterion for evaluating the quality of workpieces produced by changing the shape of the sheet metal parts provided for this purpose on a bending press is that the bending angle is as uniform as possible along the bending edge. To this end, the edge of the bending die must penetrate into the recess of the die to the same extent over the entire bending edge being formed. Firstly, a prerequisite is that the support surfaces or edges of the bending tools acting on the metal sheet remain as parallel to each other as possible during the bending deformation process. Depending on the arrangement of the bending tools on the tool holder of the press plate and on the pressure rod that moves relative to it, as well as the size of the deformation force to be applied, the tool support surfaces will deform or bend as the deformation force is applied. In order to avoid manufacturing errors caused by deformation or bending of the pressure rod, many devices are known in which the press plate is bent outwardly for compensation. The degree of bending is based on the ability to compensate for the bending deformation of the pressure rod and the press plate in the mutually opposing bending tool areas, thereby keeping the tool support surfaces sufficiently parallel to each other.

[0003] Patent EP 1 452 302 B1 therefore describes a corresponding method for correcting the bending process of a bending press, in which the deformation forces generated are measured with the aid of sensors and an additional compensating force is generated with the aid of a hydraulic cylinder arranged in the press table, by which the table of the press table is kept essentially straight. The document relates in particular to a calculation method that can be used when calibrating a correction process for a bending process. The press table of the bending press described here is essentially a sandwich structure. A further table is supported on both sides (i.e. the front and back sides) of the middle table (on top of which a tool holder for the mold is arranged). The side ends of all three table plates are each fastened together to the frame of the bending press. Summary of the Invention

[0004] The object of the present invention is to create a bending device in which a bending of the press rod or the press table can be compensated more reliably.

[0005] The object of the present invention is achieved by a bending device for producing components by changing the shape of a workpiece made of sheet metal. The bending device comprises a press table and a press rod located opposite and parallel to the press table, the press rod being adjustable relative to the press table in a direction perpendicular to the longitudinal extension of the press table by means of a drive. The press table comprises a body, an adjusting rod with a tool holder, and an actuator arranged between the body and the adjusting rod for elastically changing the shape of the adjusting rod relative to the body. A slotted recess extending parallel to the longitudinal extension of the press table and open toward the press rod is formed in the body. The adjusting rod is accommodated in this recess in the body, and the actuator is arranged between the underside of the adjusting rod and the bottom of the body recess. This provides a bending device in which bending deformations of the press rod or the press table can be compensated with increased reliability, even under varying loads during the bending process.

[0006] Advantageously, a development of the bending device is also provided, wherein a channel extending through the fuselage is formed in the fuselage perpendicular to the front wall and the rear wall of the hollowing portion of the fuselage, and wherein an actuator is respectively attached to the bottom of the channel.

[0007] The advantage of the bending device being designed such that the channels with the actuators are arranged equidistantly in the longitudinal extension of the press table is that the compensation of the bending deformation can be controlled more easily in this way.

[0008] By providing the actuators with hydraulic cylinders each having a plurality of pistons, a space-saving design of the counterpressing table can be achieved.

[0009] Advantageously, there is also a further development of the bending device in which threaded holes are formed in the piston of the actuator, by means of which the piston is screwed onto the underside of the adjusting rod. This increases the rigidity or internal stability of the press table.

[0010] It is particularly advantageous to configure the device in such a way that the body of the press table is designed in one piece with an approximately square plate outer shape, since this allows a particularly high rigidity of the body to be achieved.

[0011] In an improved version of the bending device, the hollow part in the fuselage for accommodating the adjusting rod has an approximately basin-shaped extended body in the longitudinal direction of the press table, so that the support point between the front wall and the rear wall of the fuselage in the end area of ​​the longitudinal side also has the same high rigidity.

[0012] By constructing a support point for a rotary bearing with a support bolt (21) between the machine body (15) and the adjusting rod (16) in the longitudinal end area of ​​the press table (3), the spatial position and orientation of the tool holder during the bending forming process can be well and reliably controlled.

[0013] According to a preferred development of the bending device, provision is made for a downwardly open bearing shell to be formed on the underside of the adjusting lever for the bearing point in the longitudinal end region of the press table.

[0014] By designing the device such that a screw is provided for each bearing point, with which the corresponding longitudinal end region of the adjusting rod is tightened against the fuselage, wherein each screw is respectively passed through a supporting bolt and extends transversely to the axis of the supporting bolt, it is ensured that no undesirable mechanical play occurs between the adjusting rod and the fuselage even when loads are applied.

[0015] It is also advantageous if, in the device, a mounting plate is provided for fastening the actuators to the channel bottom, wherein the mounting plate is fastened to the bottom by a plurality of screws located approximately in the center of the recess, and wherein each of the actuators is fastened to the mounting plate by a first row of screws in the front wall region and a second row of screws in the rear wall region. This allows for a cost-effective connection of the actuators to the fuselage.

[0016] An independent solution of the invention is also achieved by configuring the bending device such that a central bearing point for fixing the adjusting lever in the fuselage is formed in the middle of the longitudinal extension of the press table, in the recess of the fuselage.

[0017] It is advantageous here if the lower side of the adjusting lever is screwed against the bottom surface of the recess at the intermediate bearing point.

[0018] In a preferred embodiment of the bending device, a central support bolt is arranged at the central support point, extending perpendicularly to the front wall or the rear wall through the bottom surface area of ​​the fuselage. A central bearing shell with an approximately semicircular cross-section is formed on the underside of the adjusting rod for supporting on the central support bolt. This provides a secure clamping of the adjusting rod in the form of a centrally clamped bracket spaced apart toward the two ends. This also provides a secure securing effect, preventing undesirable displacement of the adjusting rod relative to the fuselage in the longitudinal extension of the press table.

[0019] By virtue of the following construction, i.e., in the longitudinal extension area of ​​the press table facing away from the central support point, a distance is maintained between the bottom of the hollowed-out portion of the fuselage and the underside of the adjusting rod, sufficient movement space can be left for the adjusting rod when pressure is applied to bend during the bending process.

[0020] Advantageously, the device is also developed in which the width of the actuator is less than or at most equal to the thickness of the fuselage. This allows for an overall compact and space-saving design of the press table, in which case the actuator is actually housed in the outer shell of the substantially plate-shaped fuselage.

[0021] It is advantageous to design the bending device so that the actuators have dual-action hydraulic cylinders, via which tensile and compressive forces can be exerted on the adjusting rod. This design has the advantage that, despite the two different types of support points (rotating bearings at the end and central support points), the bending device can be selectively adapted. However, this also makes it possible to apply tensile and compressive forces to the adjusting rod alternately within a row of multiple actuators.

[0022] In one embodiment of the bending device, at least four channels with actuators are arranged in the press table. This embodiment has proven to be particularly useful for controlling the compensation of bending deformations of the press rods.

[0023] It is advantageous to embody the device in such a way that the hydraulic cylinders of the actuators each have at least three pistons, which has the advantage that the actuators can be arranged in a space-saving manner.

[0024] For a better understanding of the present invention, it will be explained in more detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] This is shown in a highly simplified diagram:

[0026] Figure 1 This is the front view of the bending equipment when processing the workpiece;

[0027] Figure 2 A bending device with a device for compensating for deformations of a press plate or a press rod is shown;

[0028] Figure 3 is based on Figure 2 A longitudinal section of the press shown;

[0029] Figure 4 is based on Figure 2 A perspective view of the press table shown, partially shown in exploded view;

[0030] Figure 5 is based on Figure 3 a detailed perspective view of the longitudinal section of the press table;

[0031] Figure 6 is based on Figure 3 a perspective view of a cross section of the press table shown;

[0032] Figure 7 is based on Figure 3 Detail of a longitudinal section through the press table shown. DETAILED DESCRIPTION

[0033] First, it should be noted that in the different embodiments described, identical components are assigned the same reference numerals or the same component names, and the disclosure contained throughout this specification is reasonably applicable to identical components with the same reference numerals or the same component names. Furthermore, positional information selected in this specification, such as top, bottom, side, etc., refers to the current description and accompanying drawings. If the position changes, such positional information should be transferred to the new position.

[0034] Figure 1 The figure shows a front view of the bending device 1 during processing of a workpiece 2. The bending device 1 comprises a press table 3 and a press rod 4 arranged parallel to and opposite to the press table. On the press table 3 and the press rod 4, mutually opposing bending tools are fixed by means of corresponding tool holders. These bending tools are, on the one hand, dies or bending die plates 5 on the press table 3 and, on the other hand, bending punches 6 on the press rod 4 whose position can be adjusted vertically. The first side part 7 and the second side part 8 together with the press table 3 form the stationary machine frame of the bending device 1. With the help of one or more drive devices 9, the press rod 4 moves relative to the press table 3 and in this way generates the necessary forming force for bending the workpiece 2.

[0035] The forces generated in the components of the bending device 1 during the bending process or the deformations generated under the influence of the forces are Figure 1 In the figure, the bending force 10 is represented by the driving device 9 and the deformation resistance 11 of the workpiece 2 is generated by the bending force. Figure 1 In the structure shown, the concave deformation of the press table 3 and the press rod 4 will basically occur during the bending of the workpiece 2. Figure 1 The bending line 12 on the tool side of the press table 3 is shown in the figure, while the second bending line 13 on the press rod 4 is shown in the figure. Along the longitudinal extension of the press table 3 or the press rod 4 (i.e., the bending edge formed by the workpiece 2), the bending film 6 penetrates the bending die 5 at different depths. As a result, the bending edge 14 on the workpiece 2 forms a bending angle of varying sizes.

[0036] Figure 2 A perspective view of a bending device 1 is shown with a device for compensating for deformations of a press table 3 or a press rod 4. For the sake of clarity, the drive 9 as well as the press rod 4 and the bending tools 5, 6 are not shown. Figure 1 ). This figure essentially only shows the stationary housing consisting of the press table 3 and the two side parts 7, 8.

[0037] In the bending device 1 according to the present embodiment, the press table 3 includes a body 15 and an adjusting rod 16 accommodated in a hollowed-out portion of the body 15. In addition, a plurality of actuators 17 distributed along the longitudinal extension direction of the press table are arranged in the body 15 of the press table 3. These actuators 17 are preferably constructed in the form of hydraulic cylinders. As shown in detail in the following figures, the actuators 17 are arranged between the body 15 and the adjusting rod 16. With the help of the actuators 17 in the press table 3, pressure or tension can be applied between the body 15 and the adjusting rod 16 as follows, that is, the bending deformation of the adjusting rod 16 or its tool holder can be adjusted in a targeted manner.

[0038] With the help of Figure 3 and 4 The structure of the press table 3 of the bending apparatus 1 according to the present invention will be described.

[0039] Figure 3 Shown according to Figure 2 The longitudinal section of the press table 3 is shown in FIG. Figure 4 In the figure, the press table 3 is shown in a perspective view and partially in an exploded view. In the body 15 of the press table 3, a hollow portion 18 is constructed for accommodating the adjusting rod 16. When the adjusting rod 16 is placed in the body 15, the adjusting rod 16 is arranged between the front wall 19 and the rear wall 20 of the body 15. The hollow portion 18 for the adjusting rod 16 is formed in the body 15 in the form of a groove and has a roughly basin-shaped body in the longitudinal direction of the press table 3. For this purpose, the body 15 is preferably made in one piece, wherein its outer shape is roughly equivalent to that of a rectangular plate. The hollow portion 18 is open upward (toward the press bar 4). The side of the adjusting rod 16 protruding upward from the hollow portion 18 is constructed in a T-shape and serves as a tool holder for the bending die 5 fixed thereto.

[0040] In the longitudinal end regions of the press table 3, a pivot bearing is formed between the body 15 and the adjusting rod 16. For this purpose, a bearing bolt 21 is provided, which extends through corresponding holes in the front wall 19 and the rear wall 20 of the body 15 of the press table 3. Furthermore, downwardly open bearing shells 22 are formed on the underside of the adjusting rod 16 in the longitudinal end regions of the adjusting rod 16. These two pivot bearings on the bearing bolts 21 allow the adjusting rod 16 and the body 15 to pivot relative to each other at least partially about an axis 23. The pivoting of the adjusting rod 16 and the body 15 in the region of the bearing bolts 21 occurs due to deformation of the adjusting rod 16 or the body 15 during the bending process due to the bending force 10 or the deformation resistance 11.

[0041] In the bending device 1 according to the described embodiment, the deformation of the adjusting rod 16 relative to the machine body 15 is specifically caused by appropriately controlling the actuator 17. For this purpose, a first screw 24 and a second screw 25 are provided, with which the respective longitudinal end regions of the adjusting rod 16 are fixed against the machine body 15 without play. To this end, the first screw 24 and the second screw 25 are screwed into the machine body 15 perpendicularly, transversely to the axis 23 of the support bolt 21, through the adjusting rod 16 and the support bolt 21. With the help of the actuator 17, the bending deformation of the adjusting rod 16 and, thereby, the course of the bending line 12 can be influenced. According to this embodiment, the actuator 17 is formed by a hydraulic cylinder, by which pressure can be generated. To accommodate the actuator 17, according to this embodiment, a channel 26 extending through the front wall 19 and the rear wall 20 is formed in the machine body 15.

[0042] The actuators 17 are each fastened to the bottom 27 of the channel 26 for this purpose. For this purpose, a mounting plate 28 can advantageously be provided on which the actuators 17 are placed. On the other hand, the pressure piston of the actuator 17 rests snugly on the underside 29 of the adjusting rod 16.

[0043] Figure 5 Shown Figure 3 A perspective view of a detail of the press table 3 in the longitudinal section shown. The hydraulic cylinder used as the actuator 17 is a hydraulic cylinder having three cylinders or pistons 30. The three pistons 30 of the hydraulic cylinder are pushed by hydraulic fluid in a common or continuous pressure chamber. Figure 5 It can also be seen that the mounting plate 28 is fixed to the bottom 27 of the channel 26 by means of screws. On the mounting plate 28, a hydraulic cylinder or an actuator 17 is finally fixed respectively by screws.

[0044] exist Figure 6 According to Figure 3 The cross-section of the press table 3 is shown in perspective. For a clearer view, the adjustment rod 16 is not shown here. The adjustment rod is located in the hollow portion 18 (between the front wall 19 and the rear wall 20 of the fuselage 15) in the assembled state. Figure 4 ). In this illustration, the upper end side of the piston 30 can thus be seen. As can already be seen in Figure 5As can be seen in the figure, the mounting plate 28 is fastened to the bottom 27 of the channel 26 by a row of screws, which are positioned approximately in the middle of the recess 18. In contrast, the actuator 17 is fastened to the mounting plate 28 by a first row of screws in the area of ​​the front wall 19 and a second row of screws in the area of ​​the rear wall 20 (not shown). The use of hydraulic cylinders with working elements distributed over three pistons 30 as actuators 17, as described, offers the advantage that these actuators 17 are integrated into the entire body 15 or press table 3. This means that the width 32 of the actuator 17 is less than or at most equal to the thickness 31 of the body 15.

[0045] If with the help of Figures 2 to 4 As shown, the press table 3 of the bending device 1 is provided with four actuators 17 equidistantly distributed along its entire longitudinal extension. By applying pressure from the actuators 17 to the underside 29 of the adjusting rod 16, the adjusting rod 16 can be pushed outward from the recess 18 of the machine body 15, thereby varying and adjusting its bending deformation. This deformation of the adjusting rod 16 counteracts the retaining force of the support bolts 21 in the two end regions of the press table 3. By tightening the screws 24 and 25 in the region of the support bolts 21, the vertical position of the adjusting rod 16 in the region of these support bolts 21 is always maintained at a well-defined position. This means that the screw connection ensures that the bearings on the support bolts 21 are permanently tensioned and thus free of play.

[0046] The body 15 of the press table 3 of the bending device 1 is preferably constructed in one piece. This means that the body 15 is, for example, made of a corresponding metal sheet by cutting to form the hollowing-out portion 18 and the channel 26. This allows for a high rigidity of the body 15. On the other hand, the stability of the connection of the adjusting rod 16 on or in the body 15 can also be increased by securely connecting the piston 30 of the actuator 17 to the underside 29 of the adjusting rod 16. Figure 5 and Figure 6 As shown, threaded holes 33 are formed in the piston 30 on the end face thereof so that a screw connection can be made between these threaded holes and the adjusting rod 16. Furthermore, the body 15 is preferably firmly connected to the two side parts 7, 8 by welding.

[0047] With the help of Figure 2 、 3 and Figures 5 to 7 An independent embodiment of the bending device 1 is described. Figure 7 Shown as Figure 3Detail of the longitudinal section of the press table 3 shown. In this embodiment of the bending device 1, unlike the previous embodiment, no rotary bearing is provided in the longitudinal end region of the press table 3. This means that in this bending device 1, the support bolt 21 and the two screws 24, 25 ( Figure 3 、 4 ). In contrast, in this embodiment of the press table 3, the adjusting rod 16 is fixed in the middle of the longitudinal extension of the press bar in the hollow 18 of the body 15. In the two channels 26 or actuators 17 closer to the middle of the press table 3, the adjusting rod 16 is fixed to the bottom surface 34 of the hollow 18 of the body 15. For this purpose, the adjusting rod 16 is fixed with a bottom 35 ( Figure 4 ) is screwed against the bottom surface 34 of the recessed portion 18. For this screw connection, preferably a third and a fourth screw 36, 37 are provided. In addition, the screw connection can also be reinforced by a central support bolt 38. The support bolt 38 passes through the bottom 34 area of ​​the fuselage 15 perpendicularly to the front wall 19 or the rear wall 20. On the other hand, a central bearing shell 39 ( Figure 4 ).

[0048] The fixing of the adjusting rod 16 to the central bottom surface 34 of the body 15 corresponds to the situation where the bracket is clamped in the center and has free ends facing to both sides. In the longitudinal direction of its two end areas, that is, between the bottom of the hollow part 18 of the body 15 and the underside of the adjusting rod 16, a distance 40 is left. The clearance or value of this distance 40 is at least as large as the value required for the adjusting rod 16 to compensate during the bending process. As also mentioned above, Figure 5 and Figure 6 As described, in addition to being fixed to the bottom plate 26 of the channel 26 , the actuator 17 is also connected to the adjusting rod 16 , for which purpose a screw connection is provided between the threaded hole 33 of the piston 30 of the actuator 17 and the adjusting rod 16 .

[0049] In this embodiment of the bending device 1, the hydraulic cylinder serving as the actuator 17 is suitable for generating both compressive and tensile forces on the adjusting rod 16. This means that, with the aid of the corresponding hydraulic cylinder, the piston 30 can exert pressure in two directions, thereby actively exerting force not only during the outward movement of the piston 30 but also during its retraction. In the bending device 1 according to this embodiment, the actuator 17 can thus be used to exert tensile forces on the adjusting rod 16, which can continuously reduce the distance 40 between the underside of the adjusting rod 16 and the machine body 15. Consequently, the adjusting rod 16 can be deformed, thereby deforming the bending line 12 of the tool holder into a convex shape.

[0050] Although the bending device 1 according to the present invention has been described in the exemplary embodiment with reference to a press table 3 having four actuators 17 arranged therein, a different number of actuators 17 can alternatively be provided. However, in practice, it has proven advantageous to provide four actuators 17 symmetrically and equidistantly distributed along the longitudinal extent of the press table 3. The choice of each hydraulic cylinder having three pistons should not be construed as limiting. Hydraulic cylinders can also be provided with different numbers of pistons 30 that function in the same manner.

[0051] The basic object of the present invention is also achieved by a bending device 1 which, in both embodiments, is structurally prepared for its chosen application. To this end, either the support bolt 21 with screws 24 and 25 is installed in the press table 3, or conversely, the center position of the adjustment rod 16 is securely clamped in the machine body 15 using a central support bolt 38 and two screws 36 and 37.

[0052] These embodiments illustrate possible implementation variations. It should be pointed out that the present invention is not limited to the implementation variations specifically shown, but the various implementation variations can be combined with each other in a variety of ways, and the possibility of variation is within the capabilities of professional and technical personnel in this technical field based on the technical operation teaching of the present invention.

[0053] The scope of protection is determined by the claims. However, the description and drawings serve to interpret the claims. Individual features or combinations of features from the various exemplary embodiments shown and described may constitute inventive solutions. Independent inventive solutions can be found in the description.

[0054] All information about value ranges in this specification should be understood to include any and all sub-ranges thereof. For example, when referring to 1 to 10, it should be understood that all sub-ranges from the lower limit of 1 to the upper limit of 10 are all included, that is, all sub-ranges start at the lower limit of 1 or above and end at the upper limit of 10 or below, for example, 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10.

[0055] Finally, for the sake of clarity, it should be pointed out that elements are sometimes shown out of proportion and / or enlarged and / or reduced in size in order to provide a better understanding of the construction.

[0056] Reference Signs List

[0057] 1 Bending equipment

[0058] 2 Workpiece

[0059] 3 pressure table

[0060] 4 Pressure rod

[0061] 5 Bending die

[0062] 6 Bending punch

[0063] 7 First side

[0064] 8 Second side

[0065] 9 Drive equipment

[0066] 10 Bending force

[0067] 11 Deformation resistance

[0068] 12 First bending line

[0069] 13 Second bending line

[0070] 14 Bend Edge

[0071] 15 Body

[0072] 16 Adjustment rod

[0073] 17 Actuator

[0074] 18 hollowing out

[0075] 19 Anterior wall

[0076] 20 posterior wall

[0077] 21 Support bolt

[0078] 22 bearing

[0079] 23 Axis

[0080] 24 First Screw

[0081] 25 Second screw

[0082] 26 channels

[0083] 27 bottom plate

[0084] 28 Mounting plate

[0085] 29 lower side

[0086] 30 pistons

[0087] 31 thickness

[0088] 32 width

[0089] 33 threaded holes

[0090] 34 Base plate surface

[0091] 35 lower side

[0092] 36 Third screw

[0093] 37 Fourth screw

[0094] 38 Middle support bolt

[0095] 39 Middle bearing

[0096] distance

Claims

1. A bending device (1) for producing a component by changing the shape of a workpiece (2) made of sheet metal, the bending device comprising a press table (3) and a press rod (4) opposite to and parallel to the press table, the press rod being adjustable relative to the press table (3) in a direction perpendicular to the longitudinal extension of the press table (3) by means of a drive device (9), wherein: The press platform (3) comprises a body (15), an adjusting rod (16) with a tool holder, and an actuator (17) arranged between the body (15) and the adjusting rod (16) for elastically changing the shape of the adjusting rod (16) relative to the body (15), wherein a slotted hollow portion (18) extending parallel to the longitudinal extension direction of the press platform (3) and open toward the press rod (4) is constructed in the body (15), wherein the adjusting rod (16) is accommodated in this hollow portion (18) of the body (15), and the actuator (17) is arranged between the lower side (29) of the adjusting rod (16) and the bottom of the hollow portion (18) of the body (15). The invention relates to a device for adjusting a plurality of bearings, wherein the plurality of bearings are connected to each other by a plurality of screws, wherein the plurality of bearings are connected to each other by a plurality of screws, wherein the plurality of bearings are connected to each other by a plurality of screws, wherein the plurality of bearings are connected to each other by a plurality of screws, wherein the plurality of bearings are connected to each other by a plurality of screws, wherein the plurality of bearings are connected to each other by a plurality of screws, wherein the plurality of bearings are connected to each other by a plurality of screws, wherein the plurality of bearings are connected to each other by a plurality of screws, wherein the plurality of screw ...

2. The bending device according to claim 1, characterized in that: In the fuselage (15), a channel (26) extending through the fuselage (15) is constructed perpendicularly to the front wall (19) and the rear wall (20) of the recess (18) of the fuselage (15), wherein an actuator (17) is respectively fixed to the bottom (27) of the channel (26), and the channel (26) is constructed as follows: the bottom (27) of the channel (26) respectively constitutes a partial area of ​​the bottom of the recess (18).

3. The bending device according to claim 2, characterized in that: The channels (26) with the actuators (17) are distributed equidistantly over the entire longitudinal extension of the press table (3).

4. The bending device according to any one of claims 1 to 3, characterized in that: The actuator (17) comprises a hydraulic cylinder, wherein each hydraulic cylinder has a plurality of pistons (30).

5. The bending device according to claim 4, characterized in that: Threaded holes (33) are formed in the piston (30) of the actuator (17), by means of which the piston (30) can be screwed onto the underside (29) of the adjusting rod (16).

6. The bending device according to any one of claims 1 to 3, characterized in that: The body (15) of the press platform (3) is constructed in an integrated manner, and its outer shape is equivalent to a substantially rectangular square plate.

7. The bending device according to any one of claims 1 to 3, characterized in that: The hollow portion (18) in the body (15) for the adjustment rod (16) has a substantially basin-shaped body in the longitudinal direction of the press table (3).

8. The bending device according to claim 2 or 3, characterized in that: In order to fasten the actuators (17) to the bottom (27) of the channel (26), there is a mounting plate (28) respectively, wherein the mounting plate (28) is fixed to the bottom (27) by a plurality of screws located approximately in the center of the hollow (18), and wherein the actuators (17) are each fixed to the mounting plate (28) by a first row of screw connections in the area of ​​the front wall (19) and a second row of screw connections in the area of ​​the rear wall (20).

9. The bending device according to claim 2 or 3, characterized in that: In the middle of the longitudinal extension of the press table (3), a central bearing point for fastening the adjusting rod (16) in the machine body (15) is formed in a recess (18) of the machine body (15).

10. The bending device according to claim 9, characterized in that: At the central support point, the underside (35) of the adjustment lever (16) is screwed against the bottom surface (34) of the recess (18).

11. The bending device according to claim 10, characterized in that: A central support bolt (38) is arranged at the central support point and extends perpendicularly to the front wall (19) or the rear wall (20) through the bottom surface (34) area of ​​the fuselage (15), wherein a central bearing shell (39) is constructed on the underside (35) of the adjusting rod (16) and has an approximately semicircular cross section for supporting on the central support bolt (38).

12. The bending device according to claim 9, characterized in that: In the longitudinal extension region of the press table (3) facing away from the central support point, a distance (40) remains between the bottom of the hollowing-out (18) of the fuselage and the underside of the adjusting rod (16).

13. The bending device according to any one of claims 1 to 3, characterized in that: The value of the width (32) of the actuator (17) is greater than or at most equal to the value of the thickness (31) of the fuselage (15).

14. The bending device according to any one of claims 1 to 3, characterized in that: The actuator (17) comprises a dual-function hydraulic cylinder, by which tension and compression can be selectively applied to the adjustment rod (16).

15. The bending device according to claim 2 or 3, characterized in that: At least four channels (26) with actuators (17) are provided.

16. The bending device according to claim 4, characterized in that: The hydraulic cylinders of the actuator (17) each have at least three pistons (30).

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