EP3362201B1 - Method for operating a bending press and such a bending press - Google Patents

Description

The invention relates to a manufacturing device, in particular a bending press, and a method for forming a workpiece made of sheet metal according to the preamble of claims 1 and 9.

In production systems for bending sheet metal, such as bending presses or press brakes, different bending tools must be used in the tool holders of the press table and the press beam, depending on the type and scope of the bending processes to be applied to a workpiece. In addition, press brakes with automatic tool changing systems are now also known. These have manipulation devices with appropriately designed grippers for picking up and moving the bending tools between a tool store and the tool holders in the press table or in the press beam. Different principles of action can be used for the grippers, for example mechanical grippers or grippers using the action of force from electromagnets or vacuum are known.

In certain bending processes or bending work, it is also common to arrange and fix several bending tools close together in the tool holders of the press table and the press beam. To change tools, the fixation of the tool holders must first be released again. When changing the bending tools it can happen--specifically if a single bending tool segment is to be removed--that adjacent segments stick to one another. This is the case, for example, if oil residue penetrates between the side surfaces of the bending tool segments or if they stick to one another due to the formation of residual magnetism. This results in malfunctions, particularly in the case of automatic tool changing systems. For example, it can happen that the other, adhering bending tool segment is moved along part of the transport path and finally remains in an unforeseeable place. Or the initially adhering bending tool segment detaches, tips over and falls out of the tool holder, which can even damage it. In further As a result, manual intervention is unavoidable in order to restore proper operation. Such malfunctions are therefore particularly disadvantageous, particularly in the case of automatic tool changing systems.

In the document EP 1 658 908 A1 describes a bending device for bending workpieces in the manner of a bending press. The bending tools can be transported back and forth between a tool store and the tool holders in the bending beam, inserted into the bending beam or picked up from there with the aid of a tool exchange device. In this type of bending device, it is provided that a large number of processing stations are each formed from a plurality of bending tools arranged next to one another. For this purpose, a pivotable separator is arranged on the stop device for positioning the workpiece to be machined. The separator can be moved together with the anchor device to the right or left, forwards or backwards and up and down. With the help of a wedge-shaped end area of the finger-like protruding separator, bending tools arranged close together can be divided into groups and then shifted in the direction of the longitudinal extent of the tool holders. The separator thus acts as a transport device for laterally moving the bending tools in the tool holders.

It is the object of the invention to create a manufacturing device or a method for operating a manufacturing device or bending press for forming a tool made of sheet metal, through which the functional reliability is increased.

This object of the invention is achieved by a method for operating a bending press for forming a workpiece made of sheet metal, the bending press being configured with a table beam and a press beam opposite the table beam and aligned parallel thereto, and with tool holders on the table beam and on the press beam for fastening Bending tools are formed, solved. The method also provides that the bending press includes a stop device for positioning the workpiece to be machined, a tool changing system with a tool store and with a transport device, the transport device being used to move the bending tools back and forth between the tool store and the tool holders can, and wherein the stop device is formed with a tool clamping device. When exchanging an arrangement of two or more bending tools, before the removal of a first bending tool to be moved with the transport device or before the insertion of a first bending tool to be used with the transport device, the tool clamping device of the stop device is brought into contact with a second bending tool and this second bending tool is thereby placed in held in its current position by the tool holder. In this case, the first bending tool and the second bending tool are arranged directly adjacent to one another in a position fastened in the tool holder. This procedure has the advantage that the bending tools to be manipulated are always held in a defined position and orientation when being exchanged. This is despite the fact that the clamping device associated with the tool holders is deactivated while the bending tools are being changed.

It is also advantageous that in the method the stop device comprises a stop body and the stop body is brought into contact with the second bending tool.

An advantageous development of the method provides that the stop body of the stop device comprises a carrier in an end region facing the tool holders and a tool clamping device is arranged on an underside of the carrier and the tool clamping device is brought into contact with the second bending tool. The use of the tool clamping device offers the possibility of designing its contact surfaces with a higher frictional connection, for example by designing them with increased surface roughness.

It is also advantageous if the bending tool to be moved is stored in the tool store or the bending tool to be inserted into the tool holder is removed from the tool store. This ensures that the bending tools are in a secure position and alignment, even when they are not being used.

Furthermore, the method provides that the transport device is designed with a gripper and the first bending tool for transport from the transport device in the tool holder runs parallel to the longitudinal extent of the tool holder direction is pulled or pushed. This has the advantage that the groove-like tool holders simultaneously serve as guideways for the transport of bending tools to be replaced.

The procedure in which a control device is formed and the stop device is moved by a motor driven by control commands from the control device is also advantageous.

According to a development of the method, the transport device is also moved by control commands from the control device. This has the advantage that the tool change of the bending tools can take place automatically.

The method can also provide for a second transport device to be formed and for the arrangement of the two or more bending tools to be shifted by the second transport device into an adjustment range that can be reached by the stop device before the first bending tool to be moved is removed. This has the advantage that the achievable range of action for the bending tools to be exchanged is increased.

The object of the invention is also achieved independently by a bending press for forming a workpiece made of sheet metal with a table beam and a press beam aligned opposite the table beam and parallel thereto and with tool holders formed on the table beam and on the press beam for fastening bending tools and with at least one stop device for Positioning of the workpiece to be machined solved. The bending press is also designed with a tool changing system that includes a tool store and a transport device for moving the bending tools between the tool store and the tool holders. It is also provided that the stop device comprises a stop body with a stop edge and a carrier, with a tool clamping device being attached to an underside of the carrier, and with the tool clamping device being arranged on an end region of the stop device facing the tool holder. This has the advantage that the tool clamping device can achieve greater frictional engagement between the stop device and the bending tools to be held.

According to an advantageous development of the bending press, it is provided that the tool clamping device protrudes horizontally beyond an end region of the carrier facing the tool holder. Since the tool clamping devices protrude in the direction of the bending device beyond the end of the carrier, the bending tools can also be held in place with the tool clamping device by pressing in the horizontal direction.

The further development according to which the bending press is designed with the tool store for storing bending tools is also advantageous.

It is also advantageous if the transport device is designed with a gripper for gripping the bending tool, with a range of movement of the gripper extending between the tool holder and the tool store. According to a development of the bending press, it is provided that a second transport device is formed, with a movement range of the second transport device running parallel to the longitudinal extension of the tool holder.

The bending press is advantageously designed with a control device, with the stop device being adjustable by control commands from the control device.

Another advantage is the further development of the bending press, according to which the transport device and the gripper can be adjusted by control commands from the control device.

According to a further embodiment variant of the bending press, it is provided that the tool clamping device is made of rubber or a rubber-like material. This achieves the advantage that a higher frictional connection can be ensured or that damage to surfaces of the stop device on the one hand and of bending tools on the other that are brought into contact with one another can be avoided.

According to a further alternative embodiment variant of the bending press, it is provided that the bending tool is designed with a hole and the tool clamping device is designed with a bolt that can be inserted into the hole. As a result, the holding of a bending tool in the tool holder can be achieved by positive engagement of the tool clamping device in the bending tool.

For a better understanding of the invention, it is explained in more detail with reference to the following figures.

Fig. 1

eine Biegepresse zur Umformung eines Werkstücks;

Fig. 2

die Biegepresse gemäß Fig. 1 mit einem Werkzeugspeicher für Biegewerkzeuge in Frontalansicht;

Fig. 3

eine erste Stellung der Biegewerkzeuge an der Biegepresse am Beginn eines Werkzeugwechsels;

Fig. 4

das Fortbewegen eines Biegewerkzeugs an der Biegepresse bei dem Werkzeugwechsel;

Fig. 5

die Biegewerkzeuge an der Biegepresse vor dem Wegbewegen eines zweiten Biegewerkzeugs;

Fig. 6

das Ankoppeln des Greifers des Werkzeugwechselsystems der Biegepresse an das zweite Biegewerkzeug;

Fig. 7

das Fortbewegen des zweiten Biegewerkzeugs von der Biegepresse;

Fig. 8

die Biegepresse gemäß Fig. 1 beim Einsetzen von Biegewerkzeugen mit einem ersten Biegegesenk;

Fig. 9

das Heranbewegen eines zweiten Biegewerkzeugs bei dem Werkzeugwechsel an der Biegepresse;

Fig. 10

das Positionieren des zweiten Biegewerkzeuges in einer an den ersten Biegewerkzeug anliegenden Stellung;

Fig. 11

das Festhalten des zweiten Biegewerkzeuges vor dem Entfernen des Greifers der Transporteinrichtung;

Fig. 12

das Zurückziehen des Greifers bzw. der Transporteinrichtung;

Fig. 13

das Heranbewegen eines dritten Biegewerkzeuges mit der Transporteinrichtung;

Fig. 14

ein weiteres Ausführungsbeispiel des Werkzeugwechselsystems der Biegepresse mit einer zweiten Transporteinrichtung für die Biegewerkzeuge;

Fig. 15

das Verschieben einer Anordnung mehrerer nebeneinander liegender Biegewerkzeuge mit der zweiten Transporteinrichtung auf der Werkzeugaufnahme;

Fig. 16

ein Detail der Biegepresse gemäß Fig. 1 mit einer Anschlageinrichtung einer alternativen Ausführungsform;

Fig. 17

ein weiteres Ausführungsbeispiel der Biegepresse mit einem alternativen Werkzeugwechselsystem;

Fig. 18

ein Detail der Biegepresse gemäß Fig. 1 mit einer Anschlageinrichtung einer weiteren alternativen Ausführungsform.

They each show in a greatly simplified, schematic representation:

1

a press brake for forming a workpiece;

2

the bending press according to 1 with a tool store for bending tools in a front view;

3

a first position of the bending tools on the bending press at the beginning of a tool change;

4

moving a bending tool on the press brake when changing tools;

figure 5

the bending dies on the press brake prior to moving away a second bending die;

6

the coupling of the gripper of the tool changing system of the bending press to the second bending tool;

7

moving the second bending die away from the press brake;

8

the bending press according to 1 when using bending tools with a first bending die;

9

the approach of a second bending tool during the tool change on the bending press;

10

positioning the second bender in a position adjacent to the first bender;

11

holding the second bending tool in place prior to removing the gripper of the conveyor;

12

the retraction of the gripper or the transport device;

13

bringing up a third bending tool with the transport device;

14

a further embodiment of the tool changing system of the bending press with a second transport device for the bending tools;

15

the displacement of an arrangement of a plurality of bending tools lying next to one another with the second transport device on the tool holder;

16

a detail of the bending press according to 1 with an anchor device of an alternative embodiment;

17

another embodiment of the bending press with an alternative tool changing system;

18

a detail of the bending press according to 1 with a stop device of a further alternative embodiment.

As an introduction, it should be noted that in the differently described embodiments, the same parts are provided with the same reference numbers or the same component designations, it being possible for the disclosures contained throughout the description to be applied to the same parts with the same reference numbers or the same component designations. The position information selected in the description, such as top, bottom, side, etc., is related to the figure directly described and shown and these position information are to be transferred to the new position in the event of a change of position.

The 1 1 shows a production plant formed by a bending press 1 or a press brake for producing or forming a workpiece 2. For this purpose, the bending press 1 has a table beam 4 fastened to a machine frame 3 and a press beam 5 that can be adjusted relative to the table beam 4. A bending die 6 is attached to the table beam 4 and a bending punch 7 to the press beam 5 as bending tools. With the help of a drive arrangement 8 and a linear guide arrangement 9, the press beam 5 with the bending punch 7 attached to it is guided against the table beam 4 with the bending die 6 and thus acts on the workpiece 2 lying between the bending die 6 and the bending punch 7.

A control device 10 is provided to control the course of the forming process or the bending press 1 as a whole. The control device 10 can in turn be operated by a user of the bending press 1 via an input terminal 11 . In addition to controlling the drive arrangement 8 for moving the press beam 5 up and down, the control device 10 can also be connected to other components of the bending press 1 in order to control them. Thus, according to this exemplary embodiment, the bending press 1 comprises a stop device 12 as such a controlled component. This comprises a stop body 13 with a vertically running stop edge 14 and a carrier 15. The stop edge 14 and the carrier 15 of the correspondingly positioned stop body 13 allow an exact alignment of the workpiece 2 when it is placed in the bending press 1 or on the bending die 6 before the forming process is carried out. In the 1 this situation can be seen on the undeformed workpiece 2 represented by dashed lines. The adjustment of the anchor device 12 is preferably motor-driven and corresponding to an activation by the control device 10.

When changing the workpiece 2 to be produced on the bending press 1, it may be necessary to exchange the bending tools, ie the bending die 6 and the bending punch 7, and to reposition the stop body 13 of the stop device 12. An exchange of the bending tools is made possible in that tool holders 19, 20 are provided on mutually opposite and mutually parallel end faces 17, 18 of the table beam 4 and the press beam 5.

The tool holders 19, 20 essentially have groove-shaped receiving slots which run in the direction of the longitudinal extent of the table beam 4 or the press beam 5. With the aid of suitable clamping devices (not shown) with which the tool holders 19, 20 are formed, the bending dies 6 and the bending punches 7 can each be clamped in the table beams 4 and the press beams 5, respectively. It is also provided in particular for the tool holder 20 of the press beam 5 that the clamping device is designed in two stages. In a first stage, the attachment is initially only loosened. This prevents the bending punch 7 from falling out of the receiving slot when the clamping of the tool holder 20 is released. It is thus possible that when the clamping of the tool holders 19, 20 is released, the bending tools, bending die 6 and bending punch 7, can be displaced laterally in the direction of the longitudinal extent of the receiving slots of the tool holder 19, 20. This possibility of laterally displacing the bending tools in the receiving slots of the tool holders 19, 20 also provides a basis for the construction of bending presses 1 with automated tool changing devices.

The bending press 1 includes an automated tool changing system, wherein the stop body 13 of the stop device 12 is designed according to the invention with a tool clamping device 21 . This tool clamping device 21 is used when bending tools on the tool holders 19, 20 are to be exchanged. It is particularly advantageous when two or more bending tools are arranged side by side in one of the tool holders 19, 20. The stop device 12 can be moved or displaced in such a way that finally the tool clamping device 21 selectively comes into contact with one of the bending dies 6 in such a way that this bending die 6 is held in its current position.

The Figures 2 to 7 show a sequence of manipulation steps of an automated tool change of a bending press 1 with a tool changing system. The representations according to Figures 2 to 7 show frontal views of the bending press 1 according to FIG 1 . The bending press 1 with the tool changing system also includes a tool store 22 for receiving or storing bending dies 6 or bending punches 7. A transport device 23 is also provided, with which individual bending tools are moved back and forth between the tool store 22 and the tool mounts 19, 20 can become. For this purpose, the transport device 23 is designed with a gripper 24 with which the bending dies 6 or the bending punches 7 can be gripped and moved. According to this embodiment, the transport device 23 is formed by a telescopic arm. This has a range of movement directed parallel with respect to the longitudinal extent of the tool holders 19 , 20 . A bending die 6 gripped by the gripper 24 can thus be pulled or pushed in the tool holder 19 in the manner of a linear guide. According to this exemplary embodiment, the gripper includes an electromagnet, by activating which a bending die 6 can be gripped or coupled to the gripper 24 . Alternatively, gripping by the gripper 24 can also take place in some other way, for example by mechanical clamping. Another alternative are suction cups, which can grip the bending tools with the help of a vacuum pump.

The 2 shows an initial situation of the bending press 1 after the end of a manufacturing process or before the start of a tool change. In order to be able to move the bending dies 6 out of their current position in the tool holder 19, the clamping device of the tool holder 19 is first deactivated or released.

By extending the telescopic arm of the transport device 23, the gripper 24 is moved towards a first bending die 6 to be moved ( 3 ). Meanwhile, the anchor device 12 can be repositioned. The stop device 12 is maneuvered in such a way that finally the tool clamping device 21 comes to rest on a second bending die 6 adjacent to the first bending die 6 to be moved. For this purpose, the stop device 12 is preferably raised and moved horizontally to such an extent that the tool clamping device 21 comes to rest on the underside of the carrier 15 of the stop body 13 over the adjacent, second bending die 6 . By lowering the stop device 12 with the tool clamping device 21 and finally applying a corresponding vertical pressing force 25, the second bending die 6 adjacent to the first bending die 6 is clamped or held in place.

Finally, by activating the electromagnet, the gripper 24 couples to the first bending die 6 to be moved, and retracting the telescopic arm of the transport device 23 pulls it in the direction of the tool store 22, where the bending die 6 can be placed. ( 4 ).

The stop device 12 is then raised again with the tool clamping device 21 and moved laterally until the tool clamping device 21 comes to rest over the third bending die 6 and this is now held in place by pressing it down with the tool clamping device 21 .

As in 6 shown, the second bending die 6 can now be grasped and moved by the gripper 24 ( 7 ).

The tool change described is preferably automated according to the control device 10 ( 1 ) issued control commands. The anchor device according to the invention 12 takes over the temporary holding of bending tools in the tool holders 19, 20 during the tool change on the bending press 1 as an additional function. This procedure can be used to prevent two or more of the bending tools from accidentally sticking to each other when moving individual bending tools with the transport device 23 . Experience has shown that such sticking of bending tools can lead to a detachment or separation of bending tools sticking to one another at a later point in time or at an unforeseeable position on the route between the tool holders 19, 20 and the tool store 22, and this is automated tool change taking place is disturbed or blocked as a result. In the worst case, it can also happen that bending dies 6 fall out of the tool holder 19 and are damaged. In any case, such disturbances make it necessary for an operator to intervene in order to be able to continue the proper operation of the bending press 1 again.

According to an embodiment variant of the tool changing system of the bending press 1, it can also be provided that the support 15 of the stop body 13 of the stop device 12 acts on its own as a tool clamping device.

A block made of rubber, in particular hard rubber, or a component made of a similar material having elastic properties is advantageously used as the tool clamping device 21 . In this way, the frictional connection between the contact surfaces can be improved. However, this can also prevent damage to the parts that come into contact with one another or overloading of the mechanics or the drive of the anchorage device 12 .

Based on the following Figures 8 to 13 the repositioning of an arrangement of bending dies 6 on the tool holder 19 of the table beam 4 is described. The 8 shows the positioning of the first bending die 6 on the tool holder 19. Before the gripper 24 of the transport device 23 is released from the bending die 6 and moved back, the stop device 12 is brought into contact with the bending die 6 so that it is held in the desired position. As soon as the pressing force 25 is exerted on the bending die 6 by the stop device 12, the electromagnet of the gripper 24 can be deactivated and the gripper 24 can then be removed from the bending die 6.

Holding the bending die 6 with the stop device 12 can prevent the bending die 6 and the gripper 24 from sticking together because of any residual magnetism that may remain despite switching off the electromagnet of the gripper 24 .

The 9 shows how a second bending die 6 is moved with the aid of the transport device 23. The first of the two bending dies 6 now remains held by the stop device 12 until the second bending die 6 has brought into contact with the first bending die 6 and has come to a standstill ( 10 ). The stop device 12 is then adjusted in such a way that its tool clamping device 21 finally comes to rest on the second bending die 6 and this is held in place ( 11 ). After the electromagnet of the gripper 24 of the transport device 26 has been deactivated, the telescopic arm of the transport device 26 is retracted again ( 12 ).

In 13 shows how a third bending die 6 is brought up to the two first bending dies 6 with the aid of the transport device 26 . Holding a bending die 6 while moving another bending die 6 to assemble an arrangement of bending tools ensures that bending tools that have already been positioned cannot be knocked over or possibly shifted.

The tool change carried out automatically in this way on the bending press 1 is finally completed by the arrangement of the bending tools in the respective tool holders 19, 20 being fixed together by activating the clamping devices of the tool holders 19, 20 (not shown). Such an activation of the clamping device of the tool holder 19, 20 usually takes place simultaneously over the entire longitudinal extent of the tool holders 19, 20 or of the table beam 4 and the press beam 5.

As an alternative to holding bending tools with the stop device 12 during the tool change on the bending press 1, a selective activation of the tool holders 19, 20 own clamping devices could also be provided. For this purpose, the clamping devices could be formed, for example, by a large number of bolts which are arranged over the longitudinal extension of the tool holder 19, 20 and can be moved in and out laterally.

In the 14, 15 a further and possibly independent embodiment of the bending press 1 is shown, with the same reference numerals or component designations as in the preceding ones being used for the same parts Figures 1 to 13 be used. In order to avoid unnecessary repetition, reference is made to the detailed description in the foregoing.

The Figures 14 and 15 show a further embodiment of the tool changing system of the bending press 1. The bending press 1 comprises a second transport device 26 in addition to the transport device 23 with the gripper 24. As in FIG 14 shown, the bending dies 6 are so far outside of an adjustment range 27 that can be reached by the stop device 12 that it is not possible to hold them with the tool clamping device 21 . With the aid of the transport device 26 , the arrangement of the bending dies 6 lying next to one another can initially be shifted as a whole into the region of the adjustment region 27 of the stop device 12 in the tool holder 19 . Following the tool change, as above based on the Figures 2 to 7 described, are made.

The based on Figures 14 and 15 The situation described in which an arrangement of bending dies 6 or bending punches 7 (not shown) lying next to one another is outside of the adjustment range 27 of the stop device 12 is due to the design of the bending press 1 described in the exemplary embodiment. The table beam 4 with the tool holder 19 and the press beam 5 with the tool holder 20 are arranged on the side walls of the machine frame 3 in such a way that the tool holders 19, 20 or the table beam 4 or the press beam 5 project laterally beyond the machine frame 3 or protrude laterally.

The 16 shows a detail of the press brake 1 according to FIG 1 with a stop device 12 corresponding to an alternative embodiment of the tool clamping device 21.

According to this exemplary embodiment, the tool change takes place in an arrangement of bending dies 6 arranged next to one another in that the second bending die 6 immediately adjacent to the moving, first bending die 6 by applying a horizontal Direction acting pressing force 28 is held in its current position in the tool holder 19. This is achieved by the anchor device 12 from behind (ie from the left according to 16 or. 1 ) is brought up to the bending die 6 until finally the tool clamping device 21 comes to rest on the bending die 6 . The tool clamping device 21 is fastened to the carrier 15 on the underside of the carrier 15 of the stop body 13 . The tool clamping device 21 is preferably fastened to an end region of the carrier 15 facing the bending die 6 in such a way that the tool clamping device 21 protrudes horizontally beyond the end region of the carrier 15 pointing towards the bending die 6 . Because the tool clamping device 21 protrudes beyond the end region of the carrier 15, it is achieved that when the bending tools are held in place, only the tool clamping device 21 comes into contact with them.

Due to the procedure described, a pressing force 25 ( 3 ) or pressing force 28 ( 16 ) exercise, the static friction acting between the bending tools and the tool holders 19, 20 is correspondingly increased, whereby any adhesion forces acting between bending tools lying against one another are overcome. This prevents bending tools sticking to one another from being moved along with the movement of a bending tool from an arrangement of bending tools lying next to one another.

The 17 shows another embodiment of a bending press 1 with a tool changing system. The tool changing system according to this exemplary embodiment comprises a transport carriage 29 with a pivotable gripping arm 30. A vertical guide 31 and a horizontal guide 32 are also provided for the transport carriage 29 of the tool changing system, with the aid of which the transport carriage 29 can be moved. The bending tools 6 , 7 can be moved back and forth between the tool holders 19 , 20 and the tool store 22 by means of the gripping arm 30 of the transport carriage 29 . In this method for changing tools in the bending press 1, it is provided that during the removal of bending dies 6 with the gripping arm 30 of the transport carriage 29, a bending die 6 adjacent to the bending die 6 to be moved is held by the stop device 12 or by the tool clamping device 21 in the tool holder 19 being held. In contrast to the exemplary embodiments according to FIG 1 until 16 With this tool changing system, the bending tools 6, 7 are not pushed back and forth in the tool holders 19, 20, but are directly removed or inserted by the gripper arm 30. A removal or insertion that takes place in this way is usually also referred to as "pick and place".

The described procedure with holding bending tools when changing tools can thus be used in both cases, i.e. both when the bending tools are moved in the tool holders 19, 20 and when they are removed directly with the aid of a gripper arm 30.

The 18 shows a detail of the press brake 1 according to FIG 1 with a stop device 12 of a further alternative embodiment. The bending tool formed by the bending die 6 is held in place by a positive connection between the tool clamping device 21 of the stop device 12 and the bending die 6 . For this purpose, the bending die 6 has a hole 33 running perpendicular to the longitudinal extension of the tool holder 19 . On the other hand, the tool clamping device 21 includes a bolt 34. By adjusting the stop device 12, the bolt 34 of the tool clamping device 21 can be inserted into the hole 33 of the bending tool or the bending die 6 shown and this can thus be held in its respective position in the tool holder 19 with a positive fit.

This use of the stop device 12 when changing the bending tools on the bending press 1 has the particular advantage that only minor structural adaptations are required for this. In the cheapest variant, the stop device 12 or its support 15 is used to hold the respective bending tools in the tool holders 19, 20. This saves both costs and space. The only requirement is that the stop device 12 can be adjusted in all three spatial directions relative to the table beam 4 of the bending press 1 . The adjustment of the stop device 12 with the tool clamping device 21 is preferably motor-driven and according to the control commands of the control device 10, ie preferably automatically.

The task on which the independent inventive solutions are based can be found in the description.

All information on value ranges in the present description is to be understood in such a way that it also includes any and all sub-ranges, e.g. the information 1 to 10 is to be understood in such a way that all sub-ranges, starting from the lower limit 1 and the upper limit 10, are also included , i.e. all subranges start with a lower limit of 1 or greater and end with an upper limit of 10 or less, e.g. 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10.

Finally, for the sake of clarity, it should be pointed out that, for a better understanding of the structure of the bending press 1, it or its components are sometimes shown not to scale and/or enlarged and/or reduced. <b>List of Reference Signs</b> 1 bending press 31 vertical guidance 2 workpiece 32 horizontal guidance 3 machine frame 33 Hole 4 table beam 34 bolt 5 press beam 6 bending die 7 bending stamp 8th drive arrangement 9 guide arrangement 10 control device 11 input terminal 12 anchor device 13 stop body 14 stop edge 15 carrier 16 17 face 18 face 19 tool holder 20 tool holder 21 tool clamping device 22 tool storage 23 transport device 24 gripper 25 Power 26 transport device 27 Area 28 Power 29 transport carriage 30 gripper arm

Claims (17)

1. A method for operating a bending press (1) for forming a workpiece (2) of sheet metal, wherein the bending press (1) is configured to have a table beam (4) and a press beam (5) opposite the table beam (4) and aligned parallel thereto, and wherein tool holders (19, 20) for fastening bending tools (6, 7) are formed on the table beam (4) and on the press beam (5), and wherein at least one stop device (12) is formed for positioning the workpiece (2) to be processed, and wherein the bending press (1) comprises a tool-changing system with a tool storage (22) and with a transport device (23), wherein the bending tools (6, 7) can be moved back and forth between the tool storage (22) and the tool holders (19, 20) with the transport device (23), characterized in that the stop device (12) is configured to have a tool clamping device (21), and that, when an arrangement of bending tools (6, 7) is exchanged, before the removal of a first bending tool (6, 7) to be moved away by the transport device (23) or before the insertion of a first bending tool (6, 7) to be inserted by the transport device (23), the tool clamping device (21) of the stop device (12) is brought into contact with a second bending tool (6, 7) and, thereby, this second bending tool (6, 7) is retained in the tool holder (19, 20) in its instantaneous position, wherein the first bending tool (6, 7) and the second bending tool (6, 7) are arranged directly adjacent to one another in a position fixed in the tool holder (19, 20).
2. The method according to claim 1, characterized in that the stop device (12) comprises a stop body (13) and the stop body (13) is brought into contact with the second bending tool (6, 7).
3. The method according to claim 2, characterized in that the stop body (13) of the stop device (12) comprises a carrier (15) in an end region facing the tool holders (19, 20), and the tool clamping device (21) is arranged on an underside of the carrier (15), and the tool clamping device (21) is brought into contact with the second bending tool (6, 7).
4. The method according to one of the preceding claims, characterized in that the bending tool (6, 7) to be moved away is deposited in the tool storage (22) or the bending tool (6, 7) to be inserted into the tool holder (19, 20) is removed from the tool storage (22).
5. The method according to one of the preceding claims, characterized in that the transport device (23) is configured to have a gripper (24) and the first bending tool (6, 7) is pulled or pushed for transport by the transport device (23) in the tool holder (19, 20) in a direction running parallel to the longitudinal extension of the tool holder (19, 20).
6. The method according to one of the preceding claims, characterized in that a controller (10) is formed and the stop device (12) is moved in a motor-driven manner by control commands of the control device (10).
7. The method according to one of the preceding claims, characterized in that the transport device (23) is moved by control commands of the controller (10).
8. The method according to one of the preceding claims, characterized in that a second transport device (26) is formed and the arrangement of the bending tools (6, 7) is displaced into an adjustment region (27) which can be reached by the stop device (12) before the removal of the first bending tool (6, 7) to be moved away from the second transport device (26).
9. A bending press (1) for forming a workpiece (2) of sheet metal, having a table beam (4) and a press beam (5) opposite to the table beam (4) and aligned parallel thereto, and having tool holders (19, 20) formed on the table beam (4) and on the press beam (5) for fastening bending tools (6, 7), and having at least one stop device (12) for positioning the workpiece (2) to be processed, and having a tool-changing system which comprises a tool storage (22) and a transport device (23) for moving the bending tools (6, 7) between the tool storage (22) and the tool holders (19, 20), wherein the stop device (12) comprises a stop body (13) having a stop edge (14) and a carrier (15), characterized in that a tool clamping device (21) is fastened to an underside of the carrier (15), wherein the tool clamping device (21) is arranged at an end region of the stop device (12) facing the tool holder (19, 20).
10. The bending press (1) according to claim 9, characterized in that the tool clamping device (21) projects beyond an end region of the carrier (15) facing the tool holder (19, 20) in the horizontal direction.
11. The bending press (1) according to one of claims 9 to 10, characterized in that the tool storage (22) is configured for storing bending tools (6, 7).
12. The bending press (1) according to one of claims 9 to 11, characterized in that the transport device (23) is configured to have a gripper (24) for gripping the bending tool (6, 7), wherein a movement range of the gripper (24) extends between the tool holder (19, 20) and the tool storage (22).
13. The bending press (1) according to one of claims 9 to 12, characterized in that a second transport device (26) is formed, wherein a movement range of the second transport device (26) runs parallel to the longitudinal extent of the tool holder (19, 20).
14. The bending press (1) according to one of claims 9 to 13, characterized in that a controller (10) is formed, wherein the stop device (12) is adjustable by control commands of the controller (10).
15. The bending press (1) according to one of claims 9 to 14, characterized in that the transport device (23) and the gripper (24) are adjustable by control commands of the controller (10).
16. The bending press (1) according to one of claims 9 to 15, characterized in that the tool clamping device (21) is made of rubber or a rubber-like material.
17. The bending press (1) according to one of claims 9 to 15, characterized in that the bending tool (6, 7) is configured to have a hole (33) and the tool clamping device (21) is configured to have a bolt (34) insertable into the hole (33).

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