EP3027332A1

EP3027332A1 - Bending tool system

Info

Publication number: EP3027332A1
Application number: EP14780397.7A
Authority: EP
Inventors: Wolfgang Aigner; Stefano Speziali; Thomas Weiss
Original assignee: Trumpf Maschinen Austria GmbH and Co KG
Current assignee: Trumpf Maschinen Austria GmbH and Co KG
Priority date: 2013-07-30
Filing date: 2014-07-29
Publication date: 2016-06-08
Anticipated expiration: 2034-07-29
Also published as: US20160214159A1; US9623464B2; WO2015013734A1; AT514644A1; EP3027332B1; AT514644B1; CN105531047A; CN105531047B

Abstract

The invention relates to a bending machine (1) for bending sheet metal workpieces (2), for example a press brake or a folding machine, comprising at least one tool carrier (3), wherein a plurality of tool parts (5) that can be moved along a horizontal tool receptacle (4) are arranged on at least one tool carrier (3), at least one adjusting device (6) for moving the tool parts (5), and coupling devices (14) associated with the tool parts (5), each for connecting a respective tool part (5) to the adjusting device (6). Furthermore, according to the invention the adjusting device (6) may comprise a threaded spindle (7) extending parallel to the tool receptacle (4) and each coupling device (14) may comprise a spindle nut segment (15), wherein the spindle nut segment (15) can be coupled to the tool part (5) or to the threaded spindle (7).

Description

Bending tool system

The invention relates to a bending machine, as indicated in claim 1.

From EP 0 258 204 A2 a bending machine is known, in which the holding-down punch of the bending cheek is segmented. These individual segments are slidably mounted in a parallel to the Abkantachse leadership of the hold and displaced by means of an actuating rod. In this case, the displaceable segments each have a coupling for connecting the individual segments, optionally with the segment-related recess on the adjusting rod or the holding-down device. The connection between displaceable segment and control rod is produced by a wedge, which can be introduced into a recess on the control rod and thus produces a positive connection between displaceable segment and control rod. A recess on the control rod is associated with a sliding segment, whereby the wedge for establishing the connection between the movable segment and

Adjustment rod can only be introduced if they are placed exactly above each other. Through this segmented hold-down it is possible to work sheet metal workpieces on which already lateral tabs are bent, and which therefore have a U-shaped cross-sectional profile. Furthermore, by the particular shape of the hold-down which have a taper, and sheet metal workpieces are processed, which have an inwardly standing tab on the laterally bent tab and therefore have a C-shaped cross-sectional profile.

The embodiment described in EP 0 258 204 A2 has the disadvantage that the recesses in the control rod are designed such that they must be assigned exactly to a hold-down segment. As a result, the control rod must be positioned exactly above this hold-down segment in order to bring the coupling of the segment into engagement with the control rod. Since all recesses are mounted in the adjusting rod at a fixed distance from each other, the individual segments can not be arbitrarily and independently adjusted, whereby a considerable amount of time to adjust the hold-down can occur. Furthermore, high demands are placed on the control, since the coupling in the form of the wedge at exactly the right time, namely when the recess of the Control rod is above a hold-down, this hold-down must be engaged with the control rod.

The present invention has for its object to provide by segmentation of the Nie- derhalters or the bending tool of a bending machine the ability to edit already pre-bent sheet metal workpieces with laterally bent tabs. Here, these individual segments should be able to be moved quickly and independently of one another in a horizontal direction, in order to keep the machine times as low as possible and thus to increase the efficiency of the machine.

This object of the invention is achieved by the measures according to claim 1. In particular, by several displaceable in a tool holder tool parts, which each have a coupling seinseinrichtung. The coupling device comprises a spindle nut portion, which can be coupled to a threaded spindle, whereby a horizontal movement in the tool line can be introduced.

According to the invention, a bending machine for bending sheet metal workpieces, for example a press brake or a folding machine, comprising at least one tool carrier, wherein a plurality of tool parts displaceable along a horizontal tool holder are arranged on at least one tool carrier. Furthermore, at least one adjusting device for displacing the tool parts and coupling devices associated with the tool parts can be provided for connecting a respective tool part to the adjusting device. The adjusting device may comprise a threaded spindle running parallel to the tool holder and each coupling device may comprise a spindle nut section, it being possible for the spindle nut section to be coupled to the tool part or to the threaded spindle.

An advantage of the embodiment according to the invention is that each tool part comprises a coupling device. Thus, each tool part can be engaged independently of the other tool parts and at any time with the rotating threaded spindle, whereby a rapid adjustment of distances between the individual tool parts is possible. An appropriately designed machine control system makes it possible for several tool parts to engage the threaded spindle at the same time. are bar to adjust them at the same time. It also opens up the possibility that the tool parts can be separated from the engagement with the threaded spindle successively during an adjustment so as to be able to realize distances between the individual tool parts. In a further adjustment process, it is possible again to bring all the tool parts at the same time with the threaded spindle in engagement to these together and below

Retention of the distance between the individual tool parts to adjust. Furthermore, it is of course also possible to bring the individual tool parts in succession in order to minimize the distance between the individual tool parts again. Of course, a variation of these various possibilities can be realized with one another and, for example, one half of the tool parts can be adjusted independently of the second half of the tool parts. A so-called tool part can on the one hand be designed as a bending tool, for example, bending punch or bending die. However, it can also be designed as a hold-down punch or as a counterpart to a hold-down punch, for example for a swivel press brake. Another possibility is that the tool part is designed only as a receptacle in which the other tools are used by means of a mechanical connection.

It can further be provided that the coupling device comprises an actuating device which brings about the engagement of the spindle nut section in the threaded spindle or the tool part and which is connected to the control of the bending machine. It is particularly advantageous if the actuating device is connected to the control of the bending machine, since thereby the machine can be automated. The actuator itself can be performed in several different variants. The actuating device may be, for example, an electromagnetically switchable device. Furthermore, it is conceivable that the actuating device is a hydraulically or pneumatically operated cylinder, or that a small servomotor is used as the actuating device.

Furthermore, it is expedient if the spindle nut section is rotatably mounted in the tool part and is in constant engagement with the threaded spindle, and if the actuating device is a coupling for transmitting torque between the spindle nut section and

Tool part is. The advantage here is that the actuator, if it is designed as a friction clutch can be added at any time and switched away. Thus, in order to move the threaded spindle over the spindle nut section, which can be used as a complete spindle nut may be formed to bring the tool element in a drive connection, no prior synchronization of the threaded spindle and the spindle nut section are performed. The storage of the spindle nut portion is taken over by a rolling bearing, for example ball bearings, through which the spindle nut portion is rotatably connected to the tool element. Since the speed of the threaded spindle will be rather low and also the forces to be transmitted between spindle nut section and tool element will be low, the requirements for the stability of this bearing are negligible, whereby a cost-effective bearing can be used. It is even conceivable that due to the low demands on the bearing a plain bearing can be used, which is cheaper to buy than a roller bearing. The threaded spindle can be formed in this embodiment, for example, as a threaded spindle with trapezoidal thread, which is easy to manufacture. However, in order to increase the positioning accuracy, it is also possible to use a threaded spindle with recirculating ball thread, which is slightly more expensive to buy.

Furthermore, it is possible that the spindle nut portion resting, and relative to the threaded spindle in the radial direction adjustable, is mounted in the tool part and by the actuation device direction with the threaded spindle can be brought into engagement. The advantage here is that the spindle nut portion is not in constant engagement with the threaded spindle, whereby the spindle nut portion also does not need to be stored. In contrast to a variant with revolving spindle nut section, no ball screw can be used in the embodiment described here, but a setting thread, such as a trapezoidal thread must be used. An advantage of using a trapezoidal thread is that this is easy to manufacture in production. The actuating device should be set for such coupling between the threaded spindle and the spindle nut section so that the force with which the spindle nut section is engaged is limited, as it may happen that the switching command is given to the controller at a moment in which the thread crests of the spindle nut section and threaded spindle overlap one another. Therefore, it makes sense if the spindle nut section can slip so far over the thread crest of the threaded spindle until the thread flanks of the spindle nut section and the threaded spindle are engaged. According to a further development can be provided that the threaded spindle comprises at least two independently drivable spindle sections. The advantage here is that the machine times can be further shortened by the independently drivable spindle sections, whereby an advantage in the efficiency of the operation of the machine is achieved. The independently drivable spindle sections can be implemented so that the threaded spindle, for example, is divided in the middle of the machine. Now, both parts of the threaded spindle can be equipped with a motor, whereby they are independently driven. As a result, for example, one spindle section can exhibit a left-hand rotation, while a further spindle section has a right-hand rotation or stops. Furthermore, it is also possible to realize two different adjustment speeds by such an expression.

Furthermore, it can be provided that the threaded spindle has two, in particular, approximately equally long sections with opposite thread directions. The advantage in this embodiment is that the tool parts can be moved symmetrically apart or together with respect to the center plane at the same time, whereby only one drive is required, which drives the threaded spindle.

According to a further development it can be provided that the tool part has a mechanical interface for receiving different tool inserts. This is particularly advantageous because for a necessary tool change not the entire tool part together with coupling device must be changed, but that only the part of the tool must be changed, which has no or only a few mechanical small parts. It can thereby be achieved that the number of tool parts which have a coupling device is kept low, as a result of which the machine can be kept cost-effective and efficient in its use. Furthermore, it is advantageous that a possible tool change can be carried out very quickly. The mechanical interface can be designed as a quick-release coupling. Alternatively or additionally, it can be provided that the tool part is designed as a bending tool or as a hold-down device and / or as a hold-down counterpart. In such an embodiment may be advantageous that a mechanical interface for receiving a bending tool or hold-down on the tool part does not necessarily have to be provided. This embodiment is particularly advantageous when holding down on a bending machine, and their counterparts, or bending tools are in use, which only rarely or not at all have to be changed due to their universal substitutability, or due to customer needs. As a result, the functional integrity of the machine can be further ensured, whereby the complexity of the bending machine is kept as low as possible.

Furthermore, it may be expedient that the position of each tool part can be detected via a measuring device. It is particularly advantageous here that the position detection makes it possible to control the movement of the individual tool parts, since the machine control must be able to access the current position of a tool part, taking into account the desired target position, the spindle rotation direction and rotational speed, and the switching times of the coupling pretend device. The measuring device can be executed in the form of an incremental scale, to which each individual tool part can determine its position by means of an optical path measurement after a reffering. In addition to this possibility of optical position determination, it is also possible to measure the distance, for example via grinding resistors to realize.

In addition, it can be provided that the bending machine has an identifying device, by which at least one tool part and / or at least one tool insert is identifiable. The advantage here is that by the identification of a tool part or a tool insert, the geometry of the tool parts or tool inserts, which can be stored in the machine control can be considered in the calculations for positioning the tool inserts or tool parts. In this case, it may be necessary to identify each of these parts individually to determine its geometry and to position it in cooperation with the measuring device. However, it may also be possible that only one of these elements is identified from a set of identical tool inserts or tool parts, which are always used together in the bending machine, wherein the remaining tool parts or tool inserts need not be specifically identified. The identification device can be provided as an optical device which, for example, reads in a bar code on the individual tool parts or on the individual tool inserts by being movable relative to them. It is also conceivable that the identification device is executed, for example, by the use of RFID components. Furthermore, it can be provided that the drive device of the threaded spindle or the coupling device directions comprise an overload safety device, in particular a friction clutch. It is particularly advantageous in this case that, in the event of a malfunction of the controller, or in the case of a machine breakage, or operating error in which the tool parts get into collision with one another or with other components, the force which is exerted on the tool part can be limited. This can prevent damage to the bending machine. Furthermore, it may be expedient that each tool part has a clamping device for horizontal position assurance. This is particularly advantageous because the tool part, if it should just not be moved, and therefore not engaged with the threaded spindle is not to change its position. Furthermore, such a clamping device can be used so that when a tool part is clamped, another tool part can be moved so far until it rests directly on the clamped tool part without moving it. Thereby, the tool parts can be positioned "abutment" with each other, whereby the gap between the individual tool parts can be brought to zero so as to provide a continuous tool unit Such a clamping device can be provided in the form of a clamping wedge or a pin, rather between the tool part and tool holder produces a frictional connection.

Finally, it can be provided that the clamping device is activated for horizontal position assurance with the actuator. It is advantageous here that no separate control or energy supply is necessary for the actuation of the clamping device, but that the clamping device is released simultaneously as soon as the spindle nut section is brought into engagement with the threaded spindle. Once the operating direction is returned to its rest position and thus the spindle nut section is extended again from its engagement position in the threaded spindle, the clamping device is activated again to secure the tool part in its position.

For a better understanding of the invention, this will be explained in more detail with reference to the following figures. In each case, in a highly simplified, schematic representation:

1 shows a perspective view of an upper and a lower tool carrier with a plurality of tool parts arranged on the tool carrier;

2 shows a cross section of a tool carrier and the tool parts.

Fig. 3 shows a cross section of a tool carrier and the tool parts, with some

Tool parts are spaced apart from each other;

Fig. 4 is a schematic representation of tool parts, which are brought into contact with a preformed in the form of a C-profile sheet metal workpiece;

Fig. 5 is a detailed view of a coupling device of a tool part with rotating spindle nut portion and bearing of the spindle nut portion;

Fig. 6 is a detail of a coupling device of a tool part with lower spindle nut portion and receiving the spindle nut portion.

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

Fig. 1 shows a perspective view of the essential parts of a bending machine 1 for bending sheet metal workpieces 2. Basically, it may be in the illustrated Bie gemaschine to a press brake or a folding machine. As a result, only those parts of the bending machine are shown, which are essential to the invention. So- probably a press brake and a folding machine have in common that they comprise at least one tool carrier 3, in which a tool holder 4 is integrated. In both bending machine variants, there are embodiments in which only one tool carrier 3 is present, or in which two tool carriers 3 are present. In an embodiment in which a tool carrier 3 is present, the sheet metal workpiece 2 is placed on a lower support table and then the tool carrier 3, which is vertically displaceable, moves towards a fixed support table to the sheet metal workpiece 2 between the tool carrier 3 and the support table terminals. In the embodiment shown in Fig. 1, two tool carrier 3 are present, which are used for the machining of a sheet metal workpiece 2, wherein the upper tool carrier 3 is arranged vertically displaceable, and the lower tool carrier 3 is arranged stationary. A tool carrier 3 is always designed so that in the tool holder 4 of the tool carrier 3 a plurality of tool parts 5 can be accommodated, which are arranged horizontally displaceable in the tool carrier 3. The guide connection between the tool holder 4 and the tool part 5 is shown in the present drawings as a dovetail guide. Such a guide arrangement is only one of many possibilities, as a connection between the tool holder 4 and 5 tool part can be made. Of course, all other types of tool guide known to those skilled in the art can also be used.

In order to move the tool parts 5 in the horizontal direction, an adjustment 6 is necessary, which is designed as a threaded spindle 7 in the embodiment according to the invention. In the arrangement shown in Fig. 1, the threaded spindle 7 are divided into two spindle sections 8, which are each driven by a separate drive device 9. Not visible in the illustration is the short section of the threaded spindle 7, in which it is interrupted, and thus the two spindle sections 8, which are arranged on a tool carrier 3, are movable independently of each other. Even with a design with a split threaded spindle 7, it is not necessary that the threaded spindle 7 in the part plane has a bearing, since the threaded spindle 7 is held by the individual tool parts 5 in position. The drive device 9 of the Threaded spindle 7 can be realized for example by an electric motor, in particular servomotor, but it is also conceivable that a hydraulic motor, or other motors are used as a drive device 9. By the threaded spindle 7, which is driven by a drive device 9, in the tool part 5 in a horizontal adjustment direction 10, a movement can be initiated. By adjusting in the horizontal direction and the tool inserts 11, which are connected via a mechanical interface 12 with the tool part 5, moved along.

As a further embodiment, it is also conceivable that, not as shown in Fig. 1, a tool insert 11 is mounted on the tool part 5 and can be moved with this, but that the tool part 5 is formed as a bending tool or hold-down element, and thus no mechanical interface 12 is necessary.

Furthermore, in Fig. 1, an overload protection 13 is indicated, which can be formed for example as a slip clutch and in the event of excessive force acting on the tool part 5 during the adjustment, the drive device 9 can separate from the threaded spindle 7.

Fig. 2 shows the cross section through a bending machine 1, wherein the cutting guide runs exactly at the level of the central axis of the threaded spindle 7. In this figure, the tool carrier 3 with its tool 4 and the tool parts 5 and the tool inserts 11 coupled thereto are shown in section.

The upper tool carrier 3 and the lower tool carrier 3 are identical in the area of the tool holder 4, but only the upper tool carrier is adjustable in a vertical direction. The recorded in the tool holders 3 tool parts 5 with their attached thereto or integrated tool inserts 11 which are slidably received in a horizontal adjustment 10 in the tool holder 4, can be performed the same way in the upper tool carrier 4, and in the lower tool carrier 3. Due to the sectional view, which shows the inner workings of a tool part 5, a coupling device 14 can be seen, in which a spindle nut section 15 is received. In the embodiment shown, the spindle nut portion 15 is formed as a full-circumference spindle nut. Furthermore, an actuating device 16 is shown, which is adapted to connect the spindle nut portion 15 with the tool part 5.

Furthermore, a measuring device 17 is shown schematically, which can detect the position of the individual tool parts 5 and passes it on to the machine control. It can be achieved by the position detection that the machine control of the bending machine 1 can control the coupling device 14 and thus the actuating device 16 on the basis of these measured data. Due to the position detection, it is also possible that no pure control command for the positioning of the tool parts 5 must be used, but a control cycle can be used, which actively and individually predefines and adjusts the positions.

Furthermore, a center plane 18 is shown in Fig. 2, with respect to which the tool inserts 11 are arranged mirrored. This mirrored arrangement or the special shape of a taper of the tool parts 5 has the advantage that not only sheet metal workpieces 2 can be bent with laterally bent tabs, which have a U-shape in the cross-sectional area, but that also sheet metal workpieces 2 to the laterally bent tabs can be bent again bent tabs, which thereby have a cross-sectional area in C-shape. Due to the special shape of the tool inserts 11 can be achieved that the working edge 19 of the tool insert 11 can be brought even in C-shaped sheet metal workpieces into an edge region of these workpieces with the workpiece surface 20 in touch.

Fig. 3 shows a cross section through a bending machine 1 with the same cut as shown in Fig. 2. In this representation, however, the tool parts 5 and the tool inserts 11 mounted thereon, which are located on the right side of the center plane 18, are displaced from the center plane 18 in the adjustment direction 10 to the right on the upper tool carrier 3. As a result, a sheet metal workpiece 2, which has laterally bent tabs 21, be processed in the bending machine 1, since the laterally aufgeoge- NEN tabs 21 can be introduced into the resulting gap between the individual tool inserts 11.

4 shows the schematic representation of a further embodiment in which the laterally bent tabs 21 of the sheet metal workpiece 2 have a further bend so that the cross-sectional view of the sheet metal workpiece 2 results in a C profile. Here it is apparent why it makes sense if tool inserts 11 have a taper towards the top. The tool inserts 11 can be moved so far to the edge of the workpiece surface 20 until the working edge 19 can also engage in the edge region of the laterally bent tabs 21. To insert such a sheet metal workpiece 2, the tool inserts 11 in the adjustment direction 10 in the direction of the center plane 18 must be pushed together. Now the tool carrier 3 with the tool parts 5 mounted thereon and the tool inserts 11 mounted on the tool parts 5 can be moved downwards in a vertical movement direction 22 until the working edge 19 of a tool insert 11 touches the workpiece surface 20 approximately. As a result, the entire tool carrier 3 together with the tool parts 5 and the tool inserts 11 is moved so far down until the tab 21 of the sheet metal workpiece 2 can be introduced into the taper of the tool insert 11. Subsequently, the tool inserts 11 on both sides of the median plane 18 can be shifted apart from the latter in the adjustment direction 10 until they abut approximately on the laterally bent tab 21 of the sheet metal workpiece 2. After this step, the tool carrier 3 can be further moved in the vertical direction of movement 22 down until the working edge 19 of the tool insert 11 or the tool part 5, the workpiece surface 20 of the sheet metal workpiece 2 touches. Finally, the desired bending process can be performed. After completion of the bending process, a reverse order can be used to move the tool insert 11 or the tool part 5 again out of the bent sheet metal workpiece 2 addition.

FIG. 5 shows a detail view of the section through a tool carrier 3 and the tool holder 4 and the tool parts 5 with the tool inserts 11 coupled thereto. In this figure, the tool insert 5 on the right does not have a tool insert 11 via a mechanical interface 12 the tool part 5 is coupled, but the tool part 5 is formed so that the tool insert 11 is integrated in the tool part 5 is. Furthermore, the center plane 18 is shown in Fig. 5, which separates the threaded spindle 7 into two sections 23, which have different thread orientations. As a result, the tool parts 5 can be moved symmetrically apart or together with respect to the center plane 18, whereby only one drive device 9 per threaded spindle 7 is required, which drives the threaded spindle 7. Of course, it is not absolutely necessary that the tool parts 5, which are located to the right of the center plane 18 at the same time and symmetrically with the tool parts 5, which are left center plane 18, are moved. It can also be provided that the positions of the tool parts 5 on both sides of the center plane 18 are not made symmetrical.

Furthermore, in the sectional view, the coupling device 14 is shown, which comprises an actuating device 16. The actuator 16 is executed in the illustrated view as an electromagnetically actuated clutch, which produces a mechanical connection between the tool part 5 and spindle nut portion 15 by frictional engagement. By switching the actuator 16 is simultaneously a clamping device

24 solved, which establishes a connection between the tool part 5 and the tool holder 4 in a rest position of the actuator 16 so that the tool part 5 is not moved unintentionally in the adjustment direction 10. Through these processes, now the spindle nut portion 15, which by rolling bearings

25 is received in the tool part 5, no longer rotate with the threaded spindle 7. As a result, a relative movement between the threaded spindle 7 and the spindle nut section 15 is achieved, in which the spindle nut section 15 is stationary and the threaded spindle 7 rotates. Due to the relative movement between spindle nut portion 15 and threaded spindle 7, as well as by the pitch of the thread of the threaded spindle 7, the tool part 5 is moved in the tool holder 4 along the adjustment direction 10. This adjustment process can be performed simultaneously for several tool parts 5.

In order not to damage the bending machine during this adjustment process, it can be provided that the actuating device 16 is simultaneously designed as a slip clutch and thus constitutes an overload protection 13, which protects the machine against damage. Has now a tool part 5 reaches its final and predetermined position during this adjustment process, the actuator 16 is deactivated, whereby the torque-locking connection between the tool part 5 and spindle nut section 15 is released. As a result, the spindle nut section 15 can again run with the threaded spindle 7. Furthermore, the clamping device 24 is again brought into use by this process in such a way that the tool part 5 is received in a secure manner in the tool holder 4 of the tool carrier 3.

FIG. 6 shows a further embodiment of the tool part 5, which may be independent of itself, and which in turn has the same reference numerals or identical parts for the same parts.

Component designations as used in the preceding Figs. 1-5. In order to avoid unnecessary repetition, reference is made to the detailed description in the preceding FIGS. 1-5. Fig. 6 shows the cross section through a bending machine 1, wherein the cutting guide runs exactly at the height of the central axis of the threaded spindle 7. In this figure, a further embodiment of a tool part 5 is shown, in which the spindle nut portion 15 is not designed as a circumferential spindle nut, but is integrated in the spindle nut portion 15 in a recess 26 of the tool part 5. In this case, the actuating device 16 is designed as a hydraulically or pneumatically actuated cylinder. Of course, other Antiebe can be used as actuator 16. The actuator 16 moves the spindle nut portion 15 so far in the direction of actuation 27 upwards until it is in engagement with the threaded spindle 7. As soon as the spindle nut section 15 is brought into engagement with the threaded spindle 7, the rotational movement of the threaded spindle 7, due to its thread pitch and the relative movement to the spindle nut section 15, is converted into a translational movement in which the tool part 5 moves in the adjustment direction 10 along the Tool holder 4 is moved. If the intended position of the tool part 5 is reached during the adjustment, the actuator 16 is brought back from its actuation position back to its rest position, whereby the spindle nut portion 15 is again moved from the engagement position of the threaded spindle 7. Also in this embodiment, a not shown here Asked clamping device 24 may be provided, which now clamps the tool part 5 relative to the tool holder 4.

The embodiment variant shown in Fig. 6 shows a threaded spindle 7, which is divided in the center plane 18 in two spindle sections 8. These spindle sections are independently driven by a drive device 9, whereby the adjustment of the tool parts 5 right of the center plane 18 independently and in the same direction or in the opposite direction of adjustment 10 as the adjustment of the tool parts 5, which are located on the left side of the center plane 18 , respectively.

In the embodiment variants shown in FIGS. 1-6, the tool parts 5, or the tool inserts 11, are shown as a hold-down punch, or as a counter punch for a folding machine. For the use of such a construction in a press brake, only the upper tool parts 5 or tool inserts 11 have to be designed as bending punches and the lower tool parts 5 or tool inserts 11 as die.

The embodiments show possible embodiments of the tool carrier 3 together with the components arranged thereon, it being noted at this point that the invention is not limited to the specifically illustrated embodiments thereof, but rather various combinations of the individual embodiments are possible with each other and this variation possibility due to Teaching for technical action by objective invention in the skill of those working in this technical field is the expert.

Furthermore, individual features or combinations of features from the different exemplary embodiments shown and described can also represent independent, inventive or inventive solutions. The task underlying the independent inventive solutions can be taken from the description. All information on ranges of values in objective description should be understood to include these arbitrary and all sub-ranges thereof, eg the indication 1 to 10 should be understood to encompass all sub-ranges, starting from the lower limit 1 and the upper limit 10 that is, all portions begin with a lower limit of 1 or greater and end at an upper limit of 10 or less, eg, 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10.

Above all, the individual embodiments shown in FIGS. 1-6 can form the subject of independent solutions according to the invention. The relevant objects and solutions according to the invention can be found in the detailed descriptions of these figures.

For the sake of order, it should finally be pointed out that, for a better understanding of the structure of the bending machine 1, these or their components have been shown partially unevenly and / or enlarged and / or reduced in size.

REFERENCE NUMBERS

bending machine

Sheet metal work

tool carrier

tool holder

tool part

adjusting device

screw

spindle section

driving device

adjustment

tool insert

mechanical interface

Overload protection

coupling device

Spindle nut portion

actuator

measuring device

midplane

working edge

Workpiece surface

flap

Vertical direction of movement

part Of

clamper

roller bearing

recess

operating direction

Claims

Patent claims

1. Bending machine (1) for bending sheet metal workpieces (2), for example, press brake or folding machine, comprising at least one tool carrier (3), wherein on at least one tool carrier (3) a plurality along a horizontal tool holder (4) displaceable tool parts (5) are at least one adjusting device (6) for moving the tool parts (5), and the tool parts (5) associated coupling means (14) for connecting a respective tool part (5) with the adjusting device (6), characterized in that the adjusting device (6 ) comprises a parallel to the tool holder (4) extending threaded spindle (7) and that each coupling device (14) comprises a spindle nut portion (15), wherein the spindle nut portion (15) with the tool part (5) or with the threaded spindle (7) can be coupled.

2. Bending machine according to claim 1, characterized in that the coupling device (14) comprises an engagement of the spindle nut portion (15) in the threaded spindle (7) or the tool part (5) causing actuator (16), which with the control of Bending machine (1) is connected.

3. Bending machine according to claim 1 or 2, characterized in that the spin- delmutterabschnitt (15) is rotatably mounted in the tool part (5) and in constant engagement with the threaded spindle (7), and that the actuating device (16) has a coupling for Torque transmission between the spindle nut portion (15) and the tool part (5).

4. Bending machine according to claim 1 or 2, characterized in that the spindle delmutterabschnitt (15) resting, and relative to the threaded spindle (7) in the radial direction adjustable, in the tool part (5) is mounted and by the actuating device (16) the threaded spindle (7) can be brought into engagement.

5. Bending machine according to one of the preceding claims, characterized in that the threaded spindle (7) at least two independently drivable

Spindle portions (8) comprises.

6. Bending machine according to one of the preceding claims, characterized in that the threaded spindle (7) has two in particular approximately equally long sections (23) with opposite thread directions.

7. Bending machine according to one of the preceding claims, characterized in that the tool part (5) has a mechanical interface (12) for receiving different tool inserts (11).

8. Bending machine according to claim 1-6, characterized in that the tool part (5) is designed as a bending tool or as a hold-down and / or as a hold-down counterpart.

9. Bending machine according to one of the preceding claims, characterized in that the position of each tool part (5) via a measuring device (17) can be detected.

10. Bending machine according to one of the preceding claims, characterized in that the bending machine (1) has an identifying device, by which at least one tool part (5) and / or at least one tool insert (11) is identifiable.

11. Bending machine according to one of the preceding claims, characterized in that the drive device (9) of the threaded spindle (7) or the coupling seinrich- lines (14) comprise an overload protection (13), in particular slip clutch.

12. Bending machine according to one of the preceding claims, characterized in that each tool part (5) has a clamping device (24) for horizontal position assurance.

13. Bending machine according to claim 12, characterized in that the clamping device (24) for horizontal position assurance with the actuating device (16) is activated.