JP2018531155A - Bending device - Google Patents

Abstract

The present invention relates to a bending press (3), in particular a press brake, comprising a machine frame (7), a press beam (13, 16), and a tool holder (19, arranged or formed on the press beam (13, 16). 20) and a bending tool (4) in the form of a punch (5) or die (6), the receiving part (35) of the bending tool (4) being a receiving groove in the tool holder (19, 20) (34) It relates to what is mounted in. The tool holder (19, 20) and the actuating mechanism (41) attached to the bending tool (4) are configured as a linear motor, whereby the bending tool (4) is parallel to the bending edge (31). Can be positioned in any direction (32).

Description

  The present invention relates to a bending press according to claim 1.

  Several devices are known from the prior art that allow a bending tool to be automatically set in a bending press. An operating robot or backstop unit is used to set the bending tool in the bending apparatus. In this case, the bending tool is removed from the tool storage by the operating robot or backstop unit and positioned in the tool holder according to the respective tool holder system. One possibility in this case is that the bending tool is inserted into the tool holder along the longitudinal alignment of the tool holder and positioned thereby. Another possibility is that the bending tool is inserted by the operating robot or backstop unit directly at its end position in a direction perpendicular to the longitudinal alignment, in which case There must be a latching mechanism for inserting the tool.

  The disadvantage of this specification is that the operating robot or backstop unit must have a large working range in order to be able to position the bending tool along the entire length of the tool holder in the longitudinal direction. This makes the operating robot or backstop unit very complex and heavy. Furthermore, the bending tools are removed one by one from the tool storage and inserted into the tool holder, but this is very time consuming.

  Furthermore, devices are known in which a bending tool is inserted into the tool storage by means of an operating device and subsequently positioned in the longitudinal direction of the tool storage by a spindle drive or by a rack.

  The disadvantage of this specification is that the spindle drive or rack is laborious to manufacture and is therefore expensive to procure. Furthermore, a separate holding structure must be employed to hold the bending tool for such a drive method, which again increases the complexity of the manufacturing equipment.

  It is an object of the present invention to provide a bending press having an improved device for setting a tool.

  The above-mentioned problems of the present invention are solved by the measures described in claim 1.

  According to the invention, a bending press, in particular a press brake, has a machine frame, a press beam, a tool holder and a bending tool arranged or formed on the press beam in the form of a punch or die, and a receiving part for the bending tool. Is mounted in the receiving groove of the tool holder. The tool holder and the actuator attached to the bending tool are configured as a linear motor, whereby the bending tool can be positioned in a direction parallel to the bending edge.

  An advantage of the inventive configuration of the bending press is that it is not necessary to provide an external device for moving the bending tool. Moreover, no additional movable members that suffer from wear are required. Thereby, the bending tool can be moved as easily and efficiently as possible in the tool holder. Furthermore, the advantage of being configured as a linear motor is that the individual bending tools can move independently of each other, thereby increasing the flexibility of the bending press.

  Furthermore, it may be suitable for the purpose that the tool holder is configured as a long stator. The advantage in this case is that it reduces the costs for realizing the linear motor as low as possible. In particular, it is not necessary to equip individual bending tool coils.

  Furthermore, the actuating device can be configured as a reciprocating shuttle guided in the tool holder and connectable with the receiving part of the bending tool. The advantage in this case is that it is not necessary to equip each bending tool with a permanent magnet, and only the shuttle that can be connected to the bending tool needs to have a permanent magnet. Thereby, the manufacturing costs for the bending press can be kept low.

  In addition, the shuttle can be connectable with the receiving part of the bending tool by an enterable pin. The advantage in this case is that the shuttle can easily be connected to the bending tool to be moved.

  As an alternative to this, the actuating device can be constructed in one piece with the receiving part of the bending tool. If the actuating device is configured directly in the bending tool, the advantage is that each bending tool can be moved individually and independently of one another. Moreover, no additional member needs to be configured as a shuttle in order to be able to move the bending tool.

  According to another configuration, a cleaning shuttle arranged to clean the receiving groove of the tool holder is arranged in the tool holder, which cleaning shuttle can also act as a linear motor together with the tool holder. . The advantage in this case is that the cleaning shuttle can remove dirt on the tool holder, whereby the bending tool is properly mounted in the tool holder.

  Furthermore, it may be suitable for the purpose that a permanent magnet is arranged in the actuator. The advantage in this case is that the permanent magnet can be easily arranged in the actuator and the linear motor is configured as a synchronous motor.

  Furthermore, a three-phase coil system is arranged in the area of the receiving groove of the tool holder so that the individual bending tools mounted in the tool holder can be moved independently of one another by the control device. Can be controlled. The advantage in this case is that the coil system is mounted in the tool holder so that it takes up as little space as possible and is less susceptible to mechanical damage.

  Furthermore, the coil system can be arranged at the groove bottom of the receiving groove, and the permanent magnet can be arranged on the end face side of the receiving part of the bending tool. The advantage in this case is that the linear motor can be constructed as easily as possible.

  According to an alternative, the coil system is configured on at least one side of the receiving groove, and this permanent magnet can be arranged on at least one side of the receiving part of the bending tool. The advantage in this case is that no normal force component is exerted on the bending tool by the coil system.

  According to another advantageous configuration, the coil system is configured on both sides of the receiving groove, and the permanent magnets are arranged on both sides of the receiving part of the bending tool, both coil systems being located in the center of the tool holder. It can be arranged symmetrically with respect to the plane. In particular, with such a configuration, the force introduced in the bending tool by the coil system is eliminated due to the symmetry, so that sliding friction between the bending tool and the tool holder can be reduced. In particular, the bending tool can thereby move more smoothly in the tool holder.

  Furthermore, it may be advantageous for the coil system to extend over the entire length of the tool holder. Thereby, the bending tool can be moved over the entire length of the tool holder.

  Further, a sensor can be configured and provided to detect the position of the bending tool. The position of the individual bending tools is detected by sensors or can be set using an adjusting device.

  Furthermore, it can be arranged on the sensor and the tool holder. The advantage in this case is that only one sensor used for all the bending tools needs to be provided, and it is not necessary to configure individual sensors in the bending tool for each bending tool.

  Furthermore, a clamping device is configured in the bending tool, which can be released by the magnetic field of the coil system. The advantage in this case is that the clamping device can prevent unintentional movement of the bending tool in the tool holder. In particular, the clamping device can be released by the magnetic field of the coil system. No additional actuation or drive mechanism is required thereby to release the clamping device.

  According to another configuration, the tool holder may have an attachment portion arranged outside the receiving groove, and a coil system may be incorporated in the attachment portion. The advantage in this case is that the attachment part can be easily attached to the tool holder, whereby the coil system can be attached to the tool holder so that it can be removed as required.

  In order to better understand the present invention, the present invention will be described in detail with reference to the drawings.

  Each drawing is shown in a highly simplified schematic representation.

FIG. 1 is a front view of a production facility having a bending press. FIG. 2 is a schematic cross-sectional view of a first embodiment of a bending tool having a tool holder. FIG. 3 is a schematic cross-sectional view of a second embodiment of a bending tool having a tool holder. FIG. 4 is a schematic cross-sectional view of a third embodiment of a bending tool having a tool holder. FIG. 5 is a schematic cross-sectional view of a fourth embodiment of a bending tool having a tool holder. FIG. 6 is a schematic cross-sectional view of a fifth embodiment of a bending tool having a tool holder. FIG. 7 is a schematic cross-sectional view of a sixth embodiment of a bending tool having a tool holder. FIG. 8 is a schematic longitudinal sectional view of an embodiment of a bending tool having a tool holder.

  First, it will be confirmed that in the variously described embodiments, the same members are given the same reference numerals or the same member names, and the disclosures contained throughout the description have the same reference numerals or the same member names. It can be applied to the same member. The posture instructions selected in the description, for example, the top, bottom, side, etc. are based on the directly described and displayed figures, and these posture instructions are applied mutatis mutandis to the new posture when the posture changes.

  FIG. 1 schematically shows an embodiment of a production facility 1 for freely bending a workpiece 2 made from a plate.

  The production facility 1 has a bending tool 4, in particular a press brake, for producing a workpiece 2 or a workpiece between a bending tool 4, for example a punch 5 and a die 6, which can move relative to each other. The punch 5 can also be called an upper die and the die 6 can be called a lower die.

  The machine frame 7 of the bending press 3 includes, for example, a bottom plate 8, on which side plates 9 and 10 standing vertically, spaced apart from each other in a transverse direction and aligned in parallel with each other can be arranged. These side plates 9, 10 are preferably connected to each other in the end region away from the bottom plate 8 by a solid, for example tie beam 11 formed from a plate molding.

  The side plates 9 and 10 may be formed in a substantially C shape in order to form a space for forming the workpiece 2, and are fixed on the front end surface 12 on the side near the bottom of the side plates 9 and 10, particularly the bottom plate 8. An upright press beam 13 can be fixed. This press beam 13 can also be called a press stand. A portion of the bending tool 4 is arranged and held on this. On the side of the front end face 14 away from the bottom plate 8, another press beam 16 that can move relative to the press beam 13 forming the press table, in particular a press ram, can be guided and supported by the linear guide 15.

  Tool holders 19 and 20 for mounting the bending tool 4 can be arranged or formed on end faces 17 and 18 of the press beams 13 and 16 facing each other and extending in parallel with each other.

  The illustrated bending press 3 has two drive means 22 here as drive devices 21 for an adjustable press beam 16, ie a press ram, which drive means 22, for example, from an energy network 23. Energy can be supplied, or supplied by a hydraulic circuit, and further conductively connected to the controller 24. For example, the operation of the bending press 3 is controlled via an input terminal 25 that is conductively connected to the control device 24.

  The drive means 22 may be, for example, a generally known electric spindle drive device 26, which adjusts means 27 for reversible adjustment movement of the upper press beam 16 formed by a press ram. Drive connected. Apart from that, it would also be possible to form an adjustment means that allows the drive means 22 to be operated hydraulically and / or pneumatically. In this case, a cylinder / piston configuration can be used. Other driving means such as an eccentric driving device, a toggle driving device, a rack driving device, and the like are also conceivable.

  All the implementation features or individual features of the above figure description have been set forth to illustrate an exemplary manufacturing facility 1 or bending press 3, and in an essential part of the invention of the following figure description. You can refer to it. Therefore, all the individual features described are not necessarily necessary for the construction of the invention and can be omitted or replaced with other features in order to obtain a functional bending press 3.

  Furthermore, it is shown here in a simplified manner that the bending tool 4, in particular the punch 5 and / or the die 6, can have recesses 28, 29, respectively, for manipulating them. When the bending tool 4 is operated here, the punch 5 and / or the die 6 are taken out of the tool storage by an automated operation device and automatically carried to the insertion positions 30 of the tool holders 19 and 20 of the press beams 13 and 16. It is understood that after being inserted there, it is clamped and held. The insertion position 30 can be defined at any position on the tool holders 19, 20. Furthermore, the insertion position 30 can be selected differently according to the respective needs. In this case, the tool change system which can perform a tool change operation | work in the equipment part required for it can also be mentioned.

  This operating device can be implemented, for example, in the form of a manipulator used for workpiece handling. Furthermore, the operating device can be formed by a backstop unit, which is configured, for example, to accept operating activities. Along with these embodiments and other possible embodiments, it is also possible to use manipulators configured for the purpose of handling bending tools as operating devices.

  The bending tool 4 has a bending edge 31 extending in the longitudinal direction of the bending tool 4. The bending edge 31 also defines the transition of the bending line in the workpiece 2 to be bent. The bending tool 4 is mounted in the tool holders 19 and 20 so as to be movable in a direction 32 parallel to the bending edge 31 as required. In particular, the bending tool 4 can be movable over the entire length 33 of the tool holders 19, 20.

  FIG. 2 shows a cross-sectional view of an embodiment of the bending tool 4 and the tool holders 19, 20, where again the same reference numbers or member names as in FIG. 1 above are used for the same members. To avoid unnecessary repetition, the detailed description in FIG. 1 above is indicated or referenced.

  As can be seen from FIG. 2, the tool holders 19, 20 have a receiving part 34, which can be formed, for example, in the form of a U-shaped groove. Correspondingly, the bending tool 4 has a receiving part 35 configured to be mounted in the receiving groove 34. In particular, the action of the linear motor 36 can be formed between the bending tool 4 and the tool holders 19, 20 by corresponding technical measures. By configuring the linear motor 36, the bending tool 4 can move in a direction 32 parallel to the bending edge 31. In so doing, it is not necessary to install additional mechanically movable members in the tool holders 19, 20 in order to be able to move the bending tool 4.

  For example, as shown in FIG. 2, the linear motor 36 may be configured in the form of a long stator linear motor so that the coil system 36 is disposed within the tool holders 19, 20. The coil system 37 can be arranged, for example, in the region of the groove bottom 38 of the receiving groove 34.

  Furthermore, one or more permanent magnets 39 can be arranged in the bending tool 4 so that they cooperate with the coil system 37 to produce a magnetic force. Such a structure having a coil system 37 that is a stator and a permanent magnet 39 incorporated in the mover is called a synchronous linear motor.

  In another embodiment, it is also conceivable to be configured as an asynchronous linear motor. In such an embodiment, a coil is incorporated in the mover instead of the permanent magnet 39 to induce current.

  Furthermore, the coil system 37 can extend over the entire length 33 of the tool holders 19, 20, in which case a tool storage is arranged alongside the tool holders 19, 20, in which the bending tool 4 Can move. Furthermore, a coil system is also arranged in the tool storage and is used to further transport the bending tool 4 in the tool storage.

  As can be seen from FIG. 2, the permanent magnet 39 can be arranged on the end face side 40 of the receiving part 35 of the bending tool 4. The portion of the receiving portion 35 into which the permanent magnet 39 is inserted can also be called an operating mechanism 41.

  As can further be seen from FIG. 2, the coil system 37 can be directly embedded in the tool holders 19, 20.

  FIG. 3 shows an alternative embodiment of the tool holders 19, 20, where again the same reference numbers or member names as in FIGS. 1 and 2 above are used for the same members. To avoid unnecessary repetition, the detailed description in FIGS. 1 and 2 above is indicated or referenced.

  In the embodiment shown here, the coil system 37 is not configured directly in the tool holders 19, 20, but a coil system receiving member 42 is provided, in which the coil system 37 is inserted, The system receiving member 42 itself is mounted in the tool holders 19 and 20. The coil system receiving member 42 can be configured to improve the magnetic properties of the coil system 37. For example, the coil system receiving member 42 may include an iron core 43 so that, for example, plastic is formed outside the coil system 37.

  Furthermore, a sliding lining 44 is formed on the tool holders 19 and 20 so that the bending tool 4 can be moved easily. In the alternative, a sliding lining 44 may be arranged on the bending tool 4 to work in the same way as in the illustrated embodiment. Instead of the sliding lining 44, a sliding bearing device may be configured.

  FIG. 4 shows another embodiment of the bending tool 4 and corresponding tool holders 19, 20, again with the same reference numerals used in FIGS. Or a member name is used. To avoid unnecessary repetition, the detailed description in FIGS. 1-3 above is indicated or referenced.

  As can be seen from FIG. 4, the coil system 37 can be arranged on the side surface 45 of the receiving groove 34. Correspondingly, the permanent magnet 39 can be arranged on the side surface of the receiving portion 35.

  In another embodiment not shown, the coil system 37 may be disposed on both side surfaces 45 of the receiving groove 34 and the permanent magnet 39 may be disposed on both side surfaces 46 of the receiving portion 35. In this case, the constituent members are preferably formed symmetrically with respect to the central plane 47. The advantage of doing so is that the magnetic force can be eliminated in the transverse direction 48, thereby avoiding an increased friction force between the bending tool 4 and the tool holders 19, 20.

  In particular, in such an embodiment, the permanent magnet 39 or the coil system 37 is arranged such that the bending tool 4 can be easily lifted in the vertical direction when a magnetic movement or magnetic force is actuated. The friction between the tool holders 19, 20 may be reduced.

  Furthermore, in all the embodiments described above, a sensor 49 is configured, which can be adapted to detect the position of the bending tool 4. The sensor 49 can be arranged in the tool holders 19, 20 so that the various bending tools 4 can be identified and detected by the sensor 49. The sensor can be configured as an optical sensor, for example. It is also conceivable that the sensor is configured as a proximity sensor, for example a Hall sensor.

  In an alternative, the sensor 49 can also be arranged in the bending tool 4, in particular so that, for example, an incremental sensor cooperating with the sensor 49 is arranged in the tool holders 19, 20. You can also

  FIG. 5 shows another embodiment of the bending tool 4 and the tool holders 19, 20, again with the same reference numerals or members as used in FIGS. A name is used. In order to avoid unnecessary repetition, the detailed description in FIGS. 1-4 above is indicated or referred to.

  As can be seen from FIG. 5, the actuating mechanism 41 can be configured, for example, in the form of a shuttle 50 guided by the tool holders 19, 20. Guiding the shuttle 50 in the tool holders 19 and 20 may be realized by, for example, a guide roller 51 formed on the side of the shuttle 50. Further, the permanent magnet 39 can be arranged on the lower side of the shuttle 50, for example. The shuttle 50 can have, for example, one or more pins 52, which are formed to create a shape connection between the shuttle 50 and the bending tool 4. Thereby, the bending tool 4 can be moved in the tool holders 19, 20 by the shuttle 50.

  In another embodiment, not shown, the shuttle 50 is provided with an attachment and may therefore be provided as a cleaning shuttle 53 for cleaning the receiving groove 34 of the tool holders 19, 20.

  FIG. 6 shows another embodiment of the bending tool 4 and the tool holders 19 and 20, again for the same members, the same reference numbers or member names as used in FIGS. Is used. To avoid unnecessary repetition, the detailed description in FIGS. 1-5 above is indicated or referenced.

  As can be seen from FIG. 6, a clamping device 54 is configured in the bending tool 4, and the clamping device 54 may serve to clamp the bending tool 4 in the tool holders 19, 20. By clamping the bending tool 4, it is possible to avoid the bending tool 4 from slipping undesirably in the longitudinal direction of the tool holders 19, 20 and shifting its position. The clamping device 54 can be configured to be actuated by the coil system 37, for example. By doing so, the clamping provided by the clamping device 54 can be released when the movement of the bending tool 4 is introduced.

  Such a clamping system can be realized for example by providing a clamping jaw 55 which is arranged in the bending tool 4 and pressed against the tool holders 19, 20 by springs 56. The clamping jaw 55 can be disengaged via the actuation system 57. Actuation system 57 may include, for example, a Bowden wire or lever system, which may be coupled to a permanent magnet or other actuator element. The actuator element can be actuated by a coil system 37.

  FIG. 7 shows another embodiment of the bending tool 4 and the tool holders 19 and 20, again for the same members, the same reference numerals or member names as used in FIGS. Is used. To avoid unnecessary repetition, the detailed description in FIGS. 1-6 above is indicated or referenced.

  In the embodiment according to FIG. 7, the coil system 37 is arranged in the attachment part 58. Here, the attachment part 58 can be arranged on the surface of the tool holders 19 and 20. In this connection, the permanent magnet 39 can be arranged on the side of the bending tool 4. The permanent magnet 39 can cooperate with the attachment part 58 or the coil system 37 arranged in the attachment part 58 according to the embodiment described above.

  Thus, the advantage of implementing using the attachment part 58 is that the attachment part 58 can be installed later in the existing tool holders 19 and 20 as needed.

  FIG. 8 shows a cross-sectional view in the longitudinal direction of the bending tool 4. Again, the same reference numerals or member names as those used in FIGS. 1 to 7 are used for the same members. In order to avoid unnecessary repetition, the detailed description in FIGS. 1-7 above is indicated or referenced.

  As can be seen from FIG. 8, a plurality of permanent magnets 39 can be arranged in the longitudinal direction of the bending tool 4.

  The examples show possible embodiments of the production facility 1, and it should be noted here that the present invention is not limited to the embodiments of the present invention specifically illustrated, but of the individual embodiments. Various combinations are possible, and the possibilities of these variations based on the teachings regarding the technical actions according to the present invention are within the skill of those skilled in the art.

  Furthermore, individual features or combinations of features from the various embodiments shown and described can themselves make their own inventive or inventive solutions.

  The problem underlying the unique inventive solution can be read from the description.

  In the specific description, all instructions regarding a range of values should be understood to include all subranges within that range. For example, it should be understood that the indication of 1 to 10 includes all the partial ranges from the lower limit 1 to the upper limit 10. That is, all subranges begin with one or more of the lower limits and end with 10 or less of the upper limits, for example, 1-1.7 or 3.2-8.1 or 5.5-10.

  1, 2, 3, 4, 5, 6, 7, 8, among others, can be the subject of unique solutions according to the present invention. The problems and solutions of the present invention in this regard can be read from the detailed description of these figures.

  Lastly, for the sake of formatting, these or these components have been shown not to scale and / or enlarged and / or reduced to better understand the structure of the manufacturing facility.

DESCRIPTION OF SYMBOLS 1 Manufacturing equipment 2 Work piece 3 Bending press 4 Bending tool 5 Punch 6 Die 7 Machine frame 8 Bottom plate 9 Side plate 10 Side plate 11 Tie beam 12 Front end surface 13 First press beam 14 Front end surface 15 Linear guide 16 Second press beam 17 End surface 18 End face 19 First tool holder 20 Second tool holder 21 Drive device 22 Drive means 23 Energy network 24 Control device 25 Input terminal 26 Spindle drive device 27 Adjusting means 28 Concave portion 29 Concave portion 30 Insertion position 31 Bending edge 32 Parallel direction 33 Length 34 Receiving groove 35 Receiving part 36 Linear motor 37 Coil system 38 Groove bottom 39 Permanent magnet 40 End face side 41 Actuating mechanism 42 Coil system receiving member 43 Iron core 44 Sliding lining 45 Receiving groove side face 46 Receiving part side face 47 Central face 48 Transverse direction 49 Sensor 5 Shuttle 51 guide rollers 52 pins 53 cleaning shuttle 54 clamping device 55 the clamping jaws 56 spring 57 operating system 58 Attachment portion

Claims (16)

Bending press (3), especially a press brake,
Form of machine frame (7), press beam (13, 16), tool holder (19, 20) arranged or formed in press beam (13, 16), punch (5) or die (6) A bending press, wherein the receiving part (35) of the bending tool (4) is mounted in the receiving groove (34) of the tool holder (19, 20),
The tool holder (19, 20) and the actuating mechanism (41) attached to the bending tool (4) are configured as a linear motor (36), whereby the bending tool (4) is bent edge (31). Bending press characterized in that it can be positioned in a direction (32) parallel to the.   Bending press according to claim 1, characterized in that the tool holder (19, 20) is configured as a long stator.   The actuating mechanism (41) is configured as a shuttle (50) guided in the tool holder (19, 20) and connectable with a receiving part (35) of the bending tool (4). The bending press according to claim 1 or 2.   Bending press according to claim 3, characterized in that the shuttle (50) is connectable to the receiving part (35) of the bending tool (4) by means of an enterable pin (52).   The bending press according to claim 1 or 2, wherein the operating mechanism (41) is configured integrally with the receiving portion (35) of the bending tool (4).   A cleaning shuttle (53) configured to clean the receiving groove (34) of the tool holder (19, 20) is disposed in the tool holder (19, 20), and the cleaning shuttle (53 ) Also acts as a linear motor (36) together with the tool holder (19, 20).   The bending press according to any one of claims 1 to 6, wherein a permanent magnet (39) is arranged in the operating mechanism (41).   A three-phase coil system (37) is arranged in the region of the receiving groove (34) of the tool holder (19, 20), and the coil system (37) is controlled by the control device (24). 20) Bending according to any one of claims 1 to 7, characterized in that the individual bending tools (4) mounted in 20) are controlled to be movable independently of one another. press.   The coil system (37) is disposed at the groove bottom (38) of the receiving groove (34), and the permanent magnet (39) is disposed on the end surface side (40) of the receiving part (35) of the bending tool (4). The bending press according to claim 8, wherein the bending press is arranged.   The coil system (37) is formed on at least one side (45) of the receiving groove (34), and the permanent magnet (39) is at least one of the receiving part (35) of the bending tool (4). Bending press according to claim 8, characterized in that it is arranged on the side (46).   The coil system (37) is formed on both side surfaces (45) of the receiving groove (34), and the permanent magnet (39) is formed on both side surfaces (46) of the receiving portion (35) of the bending tool (4). 11. Bending press according to claim 10, characterized in that both coil systems (37) are arranged symmetrically with respect to the center plane (47) of the tool holder (19, 20).   The bending press according to any one of claims 8 to 11, characterized in that the coil system (37) extends over the entire length (33) of the tool holder (19, 20).   Bending press according to any one of the preceding claims, characterized in that a sensor (49) is constructed, which sensor is provided for detecting the position of the bending tool (4).   Bending press according to claim 13, characterized in that the sensor (49) is arranged in the tool holder (19, 20).   A clamping device (54) is configured in the bending tool (4), the clamping device (54) being releasable by a magnetic field of a coil system (37). The bending press according to any one of the above.   The tool holder (19, 20) has an attachment part (58) arranged outside the receiving groove (34), and a coil system (37) is incorporated in the attachment part (58). The bending press according to any one of claims 1 to 15, wherein the bending press is provided.

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