EP3790678B1 - Method using a manufacturing device for shaping sheet metal - Google Patents

Description

The invention relates to a method for operating a production facility for forming sheet metal workpieces in accordance with the features of the preamble of claim 1.

Manufacturing equipment for forming workpieces from sheet metal, also referred to as bending machines for die bending or swivel bending or press brakes, have two press beams aligned parallel to one another, on which bending tools are arranged. The press beams are usually equipped with several bending tools arranged in pairs. A workpiece positioned between these bending tools is deformed by bringing them against one another or pressing them against one another, with an edge being produced in the workpiece. Corresponding bending tools - lower tool and upper tool - are also referred to as matrix and patrix.

To produce complex components, several bending operations are carried out one after the other on one and the same workpiece in a suitable sequence of manufacturing steps. Each individual such manufacturing step for carrying out a bending process includes several phases or individual measures. These include: bringing the stops into the starting position; Place the workpiece on the lower tool and place it against the stops; press upper tool against workpiece and lower tool; raise upper tool; Remove workpiece. To carry out a further production step, the stops are repositioned and the phases mentioned are repeated accordingly.

It is also already known in the prior art to provide automated or semi-automated control of the operation of these machines in such production facilities or bending machines. For this purpose, it is usual, for example, for an operator to place the workpiece in the machine and bring it to rest against the stops, whereupon the press beams are moved together after pressing a foot switch and the workpiece is thus formed. After further actuation of the foot switch, the next production step is initiated. The necessary adjustments and repositioning of the stops or also of support brackets takes place automatically on the basis of a program stored in the control. Only the triggering of the stroke or the movement of the press beams and the switching to the next production step are carried out by the operator on their own initiative.

On the other hand, solutions for monitoring the working area of press brakes are also known, in which light barriers or similar sensor arrangements are provided, which are intended to prevent collisions between machine components, but above all injuries to operators when the position of machine parts or bending tools changes automatically or semi-automatically. Such a method or a corresponding device is described in the document WO 2018/018058 A1 described by the same applicant. This document serves as the basis for the two-part form of claim 1.

With the known workpiece processing machines, increased attention and concentration of the operating personnel is still required, at the same time removing the workpiece from the machine after a completed production step, bringing it into a new alignment and reinserting it into the machine and the production program on time in the next switch production step.

The document U.S. 2002/092333 A1 describes a method and a device for forming a workpiece made of sheet metal with a production device with two press beams and bending tools attached thereto. In the bending press described, the workpiece to be machined is handled, ie it is inserted and removed from the bending press, automatically with the aid of a gripper mechanism. The workpiece placed in the processing area of the bending press is monitored by a non-contact sensor system and its alignment is thus checked. The non-contact measurement is carried out with a laser or camera system. This detects an edge of the workpiece, whereupon the alignment of the workpiece is corrected by the gripper mechanism as required. The method and the device make the use of rear stops unnecessary.

The document WO 2012/119175 A1 describes a device and a method for positioning a workpiece on a vertical press brake for a subsequent bending operation. In this case, the workpiece is fed or approached to a stop device arranged on the rear side of the press brake and the workpiece is temporarily held on the stop device with the aid of a holding device. The necessary movement or feeding of the workpiece between the bending tools is carried out by means of a handling device. The special feature of a combination of a holding device with the stop device is specifically designed for the processing of only slightly rigid workpieces, ie workpieces that deform slightly during handling due to their own weight.

The object of the present invention is to specify an improved method for operating a production facility or a workpiece processing machine, through which operation can be simplified and with which greater safety can be achieved.

• Positionieren von Anschlägen zur Ausrichtung des Werkstücks in einem Bearbeitungsbereich;
• Einlegen des Werkstücks in den Bearbeitungsbereich durch Auflegen auf ein Unterwerkzeug und Anlegen bzw. Auflegen des Werkstücks an den Anschlägen durch eine Bedienperson;
• Durchführen der Biegeumformung durch Andrücken bzw. Anpressen eines Oberwerkzeugs gegen das Werkstück und das Unterwerkzeug durch Gegeneinanderbewegen der Pressbalken;
• Auseinanderbewegen der Pressbalken;
• Entnehmen des Werkstücks aus dem Unterwerkzeug durch die Bedienperson.

The object is achieved by a method according to claim 1 for producing a component, by forming a workpiece from sheet metal and using a production device such as a press brake with two press bars aligned parallel to one another, with bending tools attached to the press bars and with a control device with a production program for the semi-automatic operation of the production facility, wherein at least two production steps, each with a bending deformation, are carried out. Each of these production steps includes the measures or phases:

• Positioning stops for aligning the workpiece in a machining area;
• Insertion of the workpiece in the machining area by placing it on a lower tool and placing or placing the workpiece on the stops by an operator;
• Carrying out the bending deformation by pressing an upper tool against the workpiece and the lower tool by moving the press beams towards one another;
• moving the press beams apart;
• The operator removes the workpiece from the lower tool.

After a first production step, the execution of a subsequent, second production step of the production program is started, with at least one camera capturing the processing area and an image recognition program determining the position and orientation of the workpiece from the images received from the camera and, based on the the position and orientation of the workpiece determined by the image recognition program, the subsequent, second production step is started by the production program.

According to the invention, the positioning of the stops is carried out automatically by the control device on the basis of instructions in the production program.

This has the advantage that manipulation times for resetting the stops can be optimized.

It is advantageous that the execution of the bending deformation is started automatically by the control device when the image recognition program has determined that the workpiece has been placed in the processing area and has been brought into contact with the stops. This has the particular advantage of relieving the operator, as he can now concentrate entirely on inserting and aligning the workpiece to be processed and, for example, it is very unlikely that the workpiece will slip while a switch is otherwise required to be pressed to start the movement of the press beam.

Also advantageous is the procedure in which the execution of the bending deformation is automatically stopped by the control device when the image recognition program has determined that the desired deformation state of the workpiece has been reached and that the control device then moves the press beams apart.

The procedure in which the second production step following the first production step is not started until it has been determined by the image recognition program The fact that the workpiece has been completely removed from the observation area has the advantage of a particularly high level of operational reliability.

The measure whereby the positioning of the stops is already started in the second production step following the first production step when the image recognition program has determined that the distance between the workpiece and the bending tools is greater than a value of a predetermined minimum distance that is specified in the Manufacturing program has been established, has the advantage of a corresponding gain in time and thus enables an overall higher productivity.

With the further measure that during the positioning of the stops they are only moved by the control device so quickly that the specified minimum distance is not undershot, a sufficient safety distance can be maintained at all times.

The procedure is also advantageous, whereby in a third production step, the operator first places the workpiece in the machining area and only then the stops are positioned by the control device, with the bending forming being started by the control device when it has been detected by the image recognition program is that the positioning of the stops is complete.

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

Fig. 1

eine Biegepresse als Ausführungsbeispiel einer Fertigungseinrichtung;

Fig. 2

einen Querschnitt der Biegepresse gemäß Fig.l;

Fig. 3

ein Zeitlaufschema eines Fertigungsprogramms zur Herstellung eines Bauteils auf der Biegepresse;

Fig. 4

ein Detail der Biegepresse mit dem Werkstück in einem vierten Fertigungsschritt des Fertigungsprogramms;

Fig. 5

ein Zeitlaufschema einer zweiten Betriebsweise der Biegepresse;

Fig. 6

ein Zeitlaufschema einer dritten Betriebsweise der Biegepresse;

Fig. 7

ein Zeitlaufschema einer vierten Betriebsweise der Biegepresse;

Fig. 8

ein Detail der Biegepresse mit dem Werkstück in einem Fertigungsschritt der Betriebsweise gemäß Fig. 7.

They each show in a greatly simplified, schematic representation:

1

a bending press as an embodiment of a manufacturing facility;

2

a cross section of the bending press according to Fig.l;

3

a timing diagram of a manufacturing program for manufacturing a component on the bending press;

4

a detail of the bending press with the workpiece in a fourth production step of the production program;

figure 5

a timing diagram of a second mode of operation of the press brake;

6

a timing diagram of a third mode of operation of the press brake;

7

a timing diagram of a fourth mode of operation of the press brake;

8

a detail of the press brake with the workpiece in a manufacturing step according to the mode of operation 7 .

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 directly described and illustrated figure and these position information are to be transferred to the new position in the event of a change in position.

the 1 shows a bending press 1 as an exemplary embodiment of a production facility or a workpiece processing machine. The bending press 1 has a lower press beam 2 and an upper press beam 3 in a known manner. The lower, fixed press beam 2 is therefore often referred to as a table beam. The upper press beam 3, on the other hand, is adjustably guided on the machine frame 4 in the vertical direction (Z-direction). The upper press beam 3 can be lowered onto the lower press beam 2 with the aid of a suitable motor drive, for example with the aid of hydraulic cylinders (not shown). To carry out a bending deformation on a workpiece 5, a lower bending tool 6 (a die) and an upper bending tool 7 (a patrix) are attached to the two press beams 2, 3 in pairs. A bending deformation of the workpiece 5 takes place then by moving the two press beams 2, 3 towards each other, with the upper bending tool 7 (abbreviated: "upper tool") being pressed against the workpiece 5 and the lower bending tool 6 (abbreviated: "lower tool") until the desired extent of deformation of the Workpiece 5 is reached.

In addition to the bending tools 6, 7 that bring about the actual bending, which act on the workpiece 5 through the relative displacement of the press beams 2, 3, the bending press 1 also includes one or more stops 8, 9, against which edges or sides of the workpiece 5 rest and thus can be aligned. The stops 8, 9 are usually also referred to as "rear stops", since they are arranged behind the press beams 2, 3 from the perspective of an operator standing in front of the bending press 1. After the stops 8, 9 have been appropriately positioned relative to the bending tools 6, 7, an operator can bend or bend the workpiece 5 very easily and yet with great accuracy.

To operate the bending press 1 , it is designed with a control device 10 and an operator terminal 11 . The operating states of the press brake 1 can be displayed to an operator on a screen 12 of the operator terminal 11 and the operator is thus able to prepare production steps to be carried out with the press brake 1 via an input device 13 . This preparation for a new production step can consist of a repositioning of the stops 8, 9, for example. For this purpose, the stops 8, 9 can be adjusted by means of a motor and the operator can reposition the stops 8, 9, for example by directly entering the new coordinates.

The machine settings required for the individual production steps are usually stored in a production program 14 in the control device 10 . The operator can call up the production program 14 on the operator terminal 11 and display it. The corresponding production steps can be selected and the setting of the new operating state of the bending press 1 can be started. After inserting the workpiece 5, ie placing the workpiece 5 on the lower tool 6 and placing it on the stop surfaces of the stops 8, 9, the bending deformation can then be started by moving the press beams 2, 3 against one another. In the case of conventional bending presses, the operator has a separate, for example formed by a foot switch switch available. By actuating the switch, the up and down movement of the upper press beam 3 can be started.

In the bending press 1 according to this exemplary embodiment, the control device 10 is also configured with an image recognition program 15 . The image recognition program 15 is suitable for analyzing images recorded from a processing area 16 in the vicinity of the bending tools 6, 7 or the workpiece 5 and, with the aid of automatic pattern recognition, for determining the current processing status of the workpiece 5 or the current phase of the production step to be carried out. At least one first camera 17 is arranged on the bending press 1 to capture the processing area 16 . During operation of the bending press 1, images of the processing area 16 recorded by the camera 17 are analyzed by the image recognition program 15 and the operating states recognized by the image recognition program 15 in the phases of the production steps are used to control the sequence of the production program 14 itself.

When the operator places the workpiece 5 in the processing area 16, the image recognition program 15 can be used to automatically determine whether the initially undeformed workpiece 5 has been brought into contact with the stops 8, 9 and has therefore reached its original length. If this has been determined by the image recognition program 15, the start of the next phase in the production program 14, namely the bending by moving the press beams against one another, can be initiated automatically. Finally, by evaluating the images from the camera 17 by the image recognition program 15, it can also be determined by the latter whether the desired state of deformation of the workpiece 5 has been reached, whereupon - again automatically - the next phase in the production step of the production program 14, namely moving the press beams apart , is caused. The operator does not need to operate a switch for this purpose. This switching to the next phase of a production step, and also the switching from a first production step to the next production step of the production program 14, is carried out automatically by the control device 10, with the respective analysis results from the image recognition program 15 serving as a basis for this.

the 2 shows a cross section of the press brake 1 according to FIG 1 .

In addition to the first camera 17 which is arranged in front of the upper press beam 3 (to the right of the press beam 3 as shown), a second camera 18 (to the left of the press beam 3) is also arranged behind the upper press beam 3 according to this exemplary embodiment. An optical axis 19 of the camera 17 and an optical axis 20 of the camera 18 are directed obliquely from above onto the processing area 16 or the workpiece 5 in the processing area 16 . Each of the two stops 8, 9 is attached to a stop device 21 and can be adjusted in the three spatial directions X, Y, Z and thus repositioned with the help of this device. For this purpose, the stop device 21 has guideways 22 directed in the X, Y and Z directions and servomotors 23 interacting therewith.

Through the representation in 2 two different points in time of two successive phases of a first production step F1 of the production of a component from the workpiece 5 are shown simultaneously. The position of the undeformed workpiece 5—shown in solid lines—corresponds to the end of the phase “inserting the workpiece 5 into the machining area 16 and placing it against the stops 8, 9”. The position of the workpiece 5 in the bent state - shown in dashed lines - corresponds to the end of the bending or the end of the phase "press upper tool 7 against workpiece 5 and lower tool 6".

• P1: Positionieren der Anschläge 8, 9 zur Ausrichtung des Werkstücks 5 in dem Bearbeitungsbereich 16;
• I1: Einlegen des Werkstücks 5 in den Bearbeitungsbereich 16 durch Auflegen auf das Unterwerkzeug 6 und Anlegen bzw. Auflegen des Werkstücks 5 an den Anschlägen 8, 9;
• B1: Durchführen der Biegeumformung durch Andrücken des Oberwerkzeuges 7 gegen das Werkstück 5 und das Unterwerkzeug 6 durch gegeneinander bewegen der Pressbalken 2, 3;
• O1: Auseinander bewegen der Pressbalken 2, 3;
• R1: Entnehmen des Werkstücks 5 aus dem Unterwerkzeug 6.

A total of at least five measures or phases can be distinguished in the first production step F1 as well as in every further production step. These phases are:

• P1: Positioning of the stops 8, 9 for aligning the workpiece 5 in the machining area 16;
• I1: Placing the workpiece 5 in the machining area 16 by placing it on the lower tool 6 and placing or placing the workpiece 5 on the stops 8, 9;
• B1: carrying out the bending deformation by pressing the upper tool 7 against the workpiece 5 and the lower tool 6 by moving the press beams 2, 3 towards one another;
• O1: moving the press beams 2, 3 apart;
• R1: Removal of the workpiece 5 from the lower tool 6.

The monitoring of the observation area 16 with the cameras 17, 18 and the evaluation of the images by the image recognition program 15 now make it possible for the completion of phase I1, i.e. the phase in which the workpiece 5 is inserted, to be automatically determined by the image recognition program 15 and Control device 10, the following phase B1, that is, the implementation of the bending deformation, is also started automatically. As a result, the end of phase B1 is also determined by image recognition program 15 and phase O1 is automatically started by control device 10 . Finally, the image recognition program 15 also determines whether the workpiece 5 has been removed from the lower tool 6, whereupon the control device 10 can start the next, second production step F2 of the production program 14 ( 3 ). This second production step F2 also begins again with a positioning of the stops 8, 9 in a phase P2, whereupon the further phases I2, B2, O2 and R2 are carried out in an analogous manner with the participation of the image recognition program 15.

• P: Positionieren der Anschläge 8, 9;
• I: Einlegen des Werkstücks 5;
• B: Durchführen der Biegeumformung;
• O: Auseinander bewegen der Pressbalken und
• R: Entnehmen des Werkstücks 5.

the 3 shows a schematic representation of the time course of two or more successive manufacturing steps F1, F2, etc. of a manufacturing program 14 for manufacturing a complex component from the workpiece 5. Each of these manufacturing steps F1, F2 includes the phases:

• P: positioning of the stops 8, 9;
• I: Insertion of the workpiece 5;
• B: performing bending deformation;
• O: Moving apart the press beam and
• R: Removal of the workpiece 5.

Equipping bending press 1 with at least one camera 17, 18 and using image recognition program 15 in control device 10 means that a further, separate switch and the actuation of the switch by the operator during production steps F1, F2 and the phases P, I, B, O and R of individual production steps can be omitted. The operator can confine himself to placing the workpiece 5 in the machining area 16 in phase I1 and bringing it to rest on the lower tool 6 and the stops 8, 9. The image recognition program 15 automatically determines whether the workpiece 5 is in the correct position, and the control device 10 then automatically directs the phase B1 by starting the bending deformation a. The start of bending at the beginning of phase B1 is thus only initiated indirectly by the operator by placing the workpiece 5 in the processing area 16 and bringing it fully to rest on the lower bending tool 6 and the stops 8, 9.

The time at which this phase B1 starts therefore also depends entirely on the movements of the operator with which he places the workpiece 5 in the machining area 16 . This point in time is just the end of phase I1 at which the image recognition program 15 establishes that the workpiece 5 has been brought into full contact with the lower bending tool 6 and the stops 8 , 9 . The situation is analogous with the removal of the workpiece 5 by the operator in phase R1. Like the duration of phase I1, the duration and end of phase R1 also depend on the operator's movements. This vagueness of the duration of the phases I1, Rl and the phases I2 and R2 of the subsequent manufacturing step F2 is therefore in the 3 represented by a jagged progression of the lateral lines of these phases.

By using the image recognition program 15 to control the production program 14, delays that would otherwise occur when an operator operates switches to advance between the phases of the production steps F1, F2 can be completely eliminated. The above statements on the first production step F1, with the phases P1, I1, B1, O1 and R1, also apply in an analogous manner to the second production step F2, with the corresponding phases P2, I2, B2, O2 and R2, and possibly also for other subsequent manufacturing steps F3, F4, etc.

the 4 shows the workpiece 5 in the processing area 16 of the bending press 1 during the fourth production step F4. The shape of the workpiece 5 and the current position of the bending tools 6, 7 corresponds—according to the notation used above—to the end of phase B4, ie the fourth bending deformation has just been completed on the workpiece 5. At the end of the fourth production step F4, phases O4 and R4 must now be carried out. through the 4 a production program 14 with at least four production steps F1, F2, F3 and F4 is illustrated by way of example.

According to the execution of the method as in the 3 shown, it is provided that the second production step F2 or its first phase P2 of repositioning the stops 8, 9 is only started when the workpiece 5 has been completely moved out of the processing area 16 in phase R1. Ie only when the image recognition program 15 has determined that the workpiece 5 has been completely removed from the lower tool 6 or from the machining area 16 does the control device 10 advance the production program 14 to phase P2.

the figure 5 shows a schematic time course of a second embodiment of the method for operating the bending press 1. It is provided that the phase P2 of repositioning the stops 8, 9 of the second production step F2 before the end of the phase Rl of removing the workpiece 5 from the Processing area 16 is started. For this purpose, a value of a minimum distance between the workpiece 5 and the stops 8, 9 in the X-direction is defined in the production program 14. The next phase P2, ie the repositioning of the stops 8, 9, can thus start earlier, namely when the image recognition program 15 determines that the workpiece 5 is at a greater distance from the bending tools 6, 7 than the value of the has reached the specified minimum distance. In the timing scheme of figure 5 This starting of phase P2, triggered by monitoring the distance, is represented graphically by an overlap of the phases R1 and P2 or by an overlap of the phases R2 and P3.

the 6 shows a time course diagram of a third exemplary embodiment of the operation of the bending press 1. In the production program 14, a value for a minimum distance between the workpiece 5 and the stops 8, 9 is again specified and monitoring is carried out by evaluating the images from the cameras 17, 18 using the image recognition program 15. In this procedure, the distance between the workpiece 5 and the stops 8, 9 is continuously monitored over time, so that the movement or the speed of the movement of the stops 8, 9 is coupled to that of the workpiece 5—almost in real time can. The movement of the stops 8, 9 also starts here only when the distance exceeds the value of the specified minimum distance. However, it is also provided that the speed of the movement of the stops 8, 9 is only so great that the predetermined minimum distance is not fallen below again will. The movement of the stops 8, 9 takes place more or less at a safety distance from the workpiece 5 moved by the operator. Accordingly, the duration of the repositioning of the stops 8, 9 in phase P2, as well as phase R1, can depend on the movements of the operator ( indicated by a jagged progression of the lateral lines of the phases R1 and P2).

Based on the following Figures 7 and 8 a fourth embodiment of the operation of the press brake 1 will be described. In this procedure, the production program 14 contains a second production step F2 with a so-called “Z-bending” of the workpiece 5. In order to carry out a subsequent, third production step F3, it may be necessary, as in 8 shown the workpiece 5 is first placed on the lower bending tool 6 (corresponds to phase I3) and the stops 8, 9 can only then be moved up to the lower bending tool 6 and the workpiece 5 (corresponds to phase P3). In this case, the start of the subsequent bending in phase B3 is triggered by the control device 10 when the image recognition program 15 has determined that the repositioning of the stops 8, 9 and thus phase P3 is complete.

As further embodiment variants of the mode of operation of the bending press 1, combinations of the above modes of operation with the use of stops 8, 9 monitored by sensor elements can also be provided. The stops 8, 9 are equipped with force measuring elements or contact switches, for example. Continuous monitoring of the measurement signals of such sensor elements by the control device 10 makes it possible to automatically initiate a countermeasure in the event of a collision with incorrectly positioned machine parts, but above all in the event of a collision or if a part of an operator's body is pinched.

The exemplary embodiments show possible variants, it being noted at this point that the invention is not restricted to the specifically illustrated variant embodiments of the same.

The scope of protection is determined by the claims.

All information on value ranges in the present description should be understood to include any and all sub-ranges, e.g. the information 1 to 10 should be understood to mean that all sub-ranges, starting from the lower limit 1 and the upper limit 10, are also included , ie 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 some elements are shown not to scale and/or enlarged and/or reduced in size for a better understanding of the structure.

list of reference numbers

1

bending press

2

press bar

3

press bar

4

machine frame

5

workpiece

6

bending tool

7

bending tool

8th

attack

9

attack

10

control device

11

operator terminal

12

screen

13

input device

14

production program

15

image recognition program

16

editing area

17

camera

18

camera

19

optical axis

20

optical axis

21

stop device

22

guideway

23

actuator

Claims (7)

1. A method for producing a component by forming a workpiece (5) from sheet metal using a manufacturing device (1) with two press beams (2, 3) oriented in parallel with one another, with bending tools (6, 7) mounted on the press beams (2, 3), and with a controller (10) having a manufacturing program (14) for the semi-automatic operation of the manufacturing device (1), wherein at least two manufacturing steps (F1, F2) are each performed using bend-forming, and wherein one manufacturing step (F1, F2) comprises the measures:

   - positioning stops (8, 9) for orienting the workpiece (5) in a processing region (16), wherein the positioning of the stops (8, 9) is carried out automatically by means of the controller (10) based on commands of the manufacturing program (14);

   - placing a workpiece (5) into the processing region (16) by placing it on a lower tool (6) and positioning the workpiece (5) against and/or placing it on the stops (8, 9) by means of an operator;

   - carrying out the bend-forming operation by pressing an upper tool (7) against the workpiece (5) and the lower tool (6) by means of moving the press beams (2, 3) against each other;

   - moving the press beams (2, 3) apart;

   - removing the workpiece (5) from the lower tool (6) by means of the operator;

   wherein, after a first manufacturing step (F1), the performance of a subsequent, second manufacturing step (F2) of the manufacturing program (14) is started, wherein the processing region (16) is captured by at least one camera (17, 18),

   characterized in that the position and orientation of the workpiece (5) is determined by an image recognition program (15), and, based on the position and orientation of the workpiece (5) determined by the image recognition program (15), the subsequent, second manufacturing step (F2) is started by the manufacturing program (14) by repositioning the stops (8, 9).
2. The method according to claim 1, characterized in that the performance of the bend-forming operation is automatically started by the controller (10) if the image recognition program (15) has determined that the workpiece (5) has been placed in the processing region (16) and positioned against the stops (8, 9).
3. The method according to claim 1 or 2, characterized in that the performance of the bend-forming operation is automatically stopped by the controller (10) if the image recognition program (15) has determined that the desired deformation state of the workpiece (5) is achieved, and that afterwards, the controller (10) carries out the movement of the press beams (2, 3) away from each other.
4. The method according to claim 1, characterized in that the second manufacturing step (F2) following the first manufacturing step (F1) is only started once the image recognition program (15) has determined that the workpiece (5) has been fully removed from the processing region (16).
5. The method according to claim 1, characterized in that positioning the stops (8, 9) during the second manufacturing step (F2) following the first manufacturing step (F1) is already started if the image recognition program (15) has determined that the workpiece (5) has a greater distance from the bending tools (6, 7) than a value of a predefined minimum distance, wherein the value of the minimum distance is specified in the manufacturing program (14).
6. The method according to claim 5, characterized in that during the positioning of the stops (8, 9), they are moved by the controller (10) only at a speed at which they do not fall under the predefined minimum distance.
7. The method according to claim 1, characterized in that in a third manufacturing step (F3), the workpiece (5) is first placed into the processing region (16) by the operator, and only afterwards, the stops (8, 9) are positioned by means of the controller (10), wherein the bend-forming operation is started by the controller (10) once the image recognition program (15) has determined that the positioning of the stops (8, 9) is complete.

Images