JP2020192592A - Safety device for press brake and control method for safety device of press brake - Google Patents

Abstract

To provide a safety device for a press brake, which contributes to ensuring safety during or after a bending process.SOLUTION: A safety device for a press brake comprises: an acquisition unit 101, a model processing unit 102, and an interference determination unit 103, and a control unit 104. The acquisition unit 101 acquires a work model and a punch model, into which a plate-like work W and a punch 3 are respectively modeled. The model processing unit 102 moves the punch model, acquired by the acquisition unit 101, to a front side of the press brake 1 in simulation, or increases the punch model in the simulation. The interference determination unit 103 determines whether the work model is in a state of entering the punch model produced by the model processing unit 102 when the work mode is subjected to a bending process by the punch model in the simulation.SELECTED DRAWING: Figure 3

Description

The present invention relates to a press brake safety device and a method for controlling the press brake safety device.

A typical press brake has a pair of upper and lower punches and dies. In the press brake, the punch is lowered, and the work is pressed and bent by the punch and the die. If an operator's hand gets between the punch and the die before bending in such a press brake, there is a risk of injury. Therefore, a safety device for preventing such an injury has been developed (Patent Document 1). The safety device described in Patent Document 1 includes a floodlight and a receiver. The floodlight emits laser light toward the receiver so that it passes between the punch and the die. When the receiver does not receive the laser beam, the safety device described in Patent Document 1 stops the bending operation.

JP-A-2017-189800

According to the safety device described in Patent Document 1, safety before bending is ensured. By the way, although there is a possibility of getting injured by pinching a hand (particularly a finger) between the work and the punch during or after bending, Patent Document 1 refers to safety during or after bending. There is room for improvement.

Therefore, the present invention has been made in view of such a situation, and an object of the present invention is to provide a press brake safety device and a control method of the press brake safety device that contribute to ensuring safety during or after bending. And.

The press brake safety device according to an example of the present invention is a press brake on a simulation of an acquisition unit that acquires a work model and a punch model that model plate-shaped workpieces and punches, respectively, and a punch model acquired by the acquisition unit. In the model processing part that moves the punch model to the front side or enlarges the punch model in the simulation, and in the punch model that the work model is processed by the model processing part when the work model is bent by the punch model in the simulation. An interference determination unit that determines whether or not interference occurs, and a control unit that executes predetermined processing to improve the safety of the press brake when the interference determination unit determines that interference will occur. And.

In the control method of the press brake safety device according to an example of the present invention, a work model and a punch model in which a plate-shaped work and a punch are modeled are acquired, respectively, and the punch model is moved to the front side of the press brake in a simulation. Alternatively, the punch model is enlarged in the simulation, and when the work model is bent by the punch model in the simulation, it is determined whether or not interference occurs in which the work model has penetrated into the punch model. When it is determined that interference will occur, a predetermined process for improving the safety of the press brake is executed.

According to the present invention, it contributes to ensuring safety during or after bending.

FIG. 1 is a configuration example of a press brake according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a scene in which an injury may occur during or after bending. FIG. 3 is a block diagram of an interference determination device according to an embodiment of the present invention. FIG. 4 is a diagram illustrating a work model according to an embodiment of the present invention. FIG. 5 is a diagram illustrating a work model according to an embodiment of the present invention. FIG. 6 is a diagram illustrating a processing example of a punch model according to an embodiment of the present invention. FIG. 7 is a diagram illustrating another processing example of the punch model according to the embodiment of the present invention. FIG. 8 shows a method of determining whether or not there is a risk of injury by pinching a hand between the work and the punch during the bending process of the work or after the bending process is completed. It is a figure which shows an example. FIG. 9 is a diagram showing an example of an image that calls attention to an operator. FIG. 10 is a diagram illustrating an example of a portion that grips the work model in the simulation. FIG. 11 is a diagram illustrating another example of a portion that grips the work model on the simulation. FIG. 12 is a diagram illustrating a region for making a determination according to an embodiment of the present invention. FIG. 13 is a flowchart illustrating an operation example of the interference determination device according to the embodiment of the present invention. FIG. 14 is a flowchart illustrating an operation example of the interference determination device according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings, the same parts are designated by the same reference numerals and the description thereof will be omitted.

(Example of press brake configuration)
A configuration example of the press brake 1 will be described with reference to FIG. In the present embodiment, the length direction means the left-right direction of the press brake 1. The depth direction means the front-rear direction of the press brake 1. In FIG. 1, FF means the direction toward the back side of the press brake 1 (direction approaching the press brake 1), and FR means the direction toward the front side of the press brake 1 (direction away from the press brake 1). U points upward and D points downward.

The press brake 1 shown in FIG. 1 drives a punch 3 against a plate-shaped work W arranged by an operator M, and bends the work W by sandwiching the work W between the punch 3 and the die 5. The press brake 1 includes a pair of side plates 9 that are separated and opposed in the length direction. The side plate 9 is installed by level bolts 13 so that the height with respect to the floor surface F can be adjusted.

Below the press brake 1, a lower table 15 extending in the length direction is provided. A die holder 17 for holding the die 5 is provided on the upper side of the lower table 15. The die 5 can be attached to and detached from the die holder 17. Further, above the press brake 1, an upper table 19 extending in the length direction is provided. The upper table 19 faces the lower table 15 in the vertical direction. A punch holder 21 for holding the punch 3 is provided on the lower side of the upper table 19. The punch 3 can be attached to and detached from the punch holder 21. Although not shown, a hydraulic cylinder (elevating actuator) for raising and lowering the upper table 19 is provided on the upper part of the side plate 9. The mechanism for raising and lowering the upper table 19 may be an electric motor.

A back gauge device 25 for determining the position of the work W with respect to the die 5 is provided in the rear direction of the lower table 15. The back gauge device 25 has an abutting member 27 capable of abutting the end face of the work W.

The press brake 1 includes a foot switch device 29 for raising and lowering the upper table 19. The foot switch device 29 is operated by stepping on the worker M. The foot switch device 29 may be a mobile type or a fixed type.

A guide member 31 extending in the length direction is provided at the lower part of the lower table 15. The guide member 31 is provided with a slide member 37 that can move in the length direction. The slide member 37 is provided with a pedal case 45 so as to be swingable in the vertical direction via a hinge 47.

As an example, a stepping down foot pedal (not shown) and an ascending foot pedal (not shown) are provided in the pedal case 45. The drive of the hydraulic cylinder is controlled by the stepping operation of the lowering foot pedal, and the upper table 19 is lowered. Similarly, the drive of the hydraulic cylinder is controlled by the stepping operation of the ascending foot pedal, and the upper table 19 is ascended. In addition, instead of the descending foot pedal and the ascending foot pedal, one foot pedal having a three-stage structure may be provided.

The press brake 1 is provided with an NC device, and this NC device has a function as an interference determination device 10. The interference determination device 10 is a device for modeling and simulating the components (mainly the work W and the punch 3) used for bending. An image that calls attention to the worker M is displayed on the display 300 according to the simulation result. In addition to the NC device, the interference determination device 10 may be provided on the press brake 1. In the present embodiment, the simulation means, for example, a bending simulation for verifying a bending process in which the work W sandwiched between the punch 3 and the die 5 is plastically deformed when the upper table 19 is lowered. The software used for the simulation is not particularly limited, and for example, HMI (Human Machine Interface), CAM (Computer Aided Manufacturing), or the like is used.

Next, with reference to FIG. 2, a scene in which an injury may occur during or after the bending process will be described.

In the state shown in FIG. 2, from the state shown in FIG. 1, the operator M operates the foot switch device 29 to lower the punch 3 (upper table 19), and the work W is being bent or bent. This is the state after the processing is completed. The completion of the bending process here means the completion of the bending process in a predetermined process.

As shown in FIG. 2, the worker M is injured by pinching a hand (particularly a finger) between the work W and the punch 3 during the bending process of the work W or after the bending process is completed. There is a risk of As described above, the safety is ensured by using the laser beam before the bending process, but it may be difficult to ensure the safety by the laser beam during the bending process or after the bending process. Therefore, the interference determination device 10 according to the present embodiment models and simulates the components (mainly the work W and the punch 3) used for the bending process. Based on the simulation result, the interference determination device 10 may pinch a hand between the work W and the punch 3 during the bending process of the work W or after the bending process is completed. Judge whether or not.

Next, the configuration of the interference determination device 10 (safety device) will be described with reference to FIG. The interference determination device 10 is a general-purpose computer including a CPU (Central Processing Unit), a memory, and a storage. The CPU reads various programs stored in the storage or the like into the memory and executes various instructions included in the programs. The memory is a storage medium such as a ROM (Read Only Memory) and a RAM (Random Access Memory). The storage is a storage medium such as an HDD (Hard Disk Drive). The interference determination device 10 has an acquisition unit 101, a model processing unit 102, an interference determination unit 103, and a control unit 104 as a plurality of information processing functions. The interference determination device 10 also has a function as an NC device.

The acquisition unit 101 acquires various models stored in the database 200 from the database 200. The various models include, for example, a model of the work W to be bent (hereinafter, may be simply referred to as a work model) and a model of the punch 3 used for bending (hereinafter, may be simply referred to as a punch model). There is), a model of the die 5 used for bending (hereinafter, may be simply referred to as a die model) and the like. Punch models include models of various shapes such as gooseneck and sash. Similarly, die models include models of various shapes corresponding to punch models (gooseneck, sash described above).

The work model includes not only a plate-shaped model before bending but also a model in which bending for each process is completed. The plate-shaped model before bending and the model for which bending for each process is completed are stored in a database so as to correspond to the punch model and the die model. The model in which the bending process for each step is completed will be described with reference to FIGS. 4 and 5. When the process has, for example, a first step and a second step, the work model after the first step is represented by WM1 in FIG. 4, and the work model after the second step is represented by WM2 in FIG. If the process has the first to third steps, a work model after the first step, a work model after the second step, and a work model after the third step are stored, although not shown. The various models are pre-modeled and stored in the database 200, but are not limited thereto. The various models may be modeled during the simulation. The database 200 shown in FIG. 3 is stored in the storage of the interference determination device 10.

An example of the timing at which the acquisition unit 101 acquires various models is when the screen of the display 300 transitions to the screen for bending. Before the worker M performs the bending process, the NC device (interference determination device 10) is operated to display a work instruction or a design drawing related to the work W on the display 300 to confirm the work contents. When the screen for confirming this is displayed on the display 300, the acquisition unit 101 acquires various models. After the above confirmation, the operator M presses the start button provided on the interference determination device 10 and steps on the foot switch device 29 to start the bending process.

The model processing unit 102 processes various models acquired by the acquisition unit 101 on a simulation. For example, the model processing unit 102 moves or enlarges the punch model on the simulation.

The interference determination unit 103 determines whether or not the punch model processed by the model processing unit 102 interferes with the work model. In the present embodiment, interference is defined as a state in which a part (or all) of the work model has penetrated into the punch model. That is, the interference determination unit 103 determines whether or not interference occurs in which the work model has penetrated into the punch model processed by the model processing unit 102.

When the interference determination unit 103 determines that interference occurs, the control unit 104 executes a predetermined process for improving the safety of the press brake 1. For example, the control unit 104 slows down the lowering speed of lowering the upper table 19 after the punch 3 comes into contact with the work W. Alternatively, the control unit 104 displays an image on the display 300 that calls attention to the worker M.

(Example of model processing by the model processing department)
Next, a processing example of the model by the model processing unit 102 will be described with reference to FIG.

As shown in FIG. 6, the model processing unit 102 moves the punch model PM to the front side (FR direction shown in FIG. 1) of the press brake 1 in the simulation. The movement amount L to be moved to the front side of the press brake 1 is set to a length that does not allow the operator M to pinch his fingers, for example, 10 mm. However, since the thickness of the finger is different for each worker M, the movement amount L may be set for each worker M. In FIG. 6, the punch model after movement is referred to as PM'. The shape of the punch model PM will be described as a gooseneck.

Next, another processing example will be described with reference to FIG. 7.

As shown in FIG. 7, the model processing unit 102 enlarges the punch model PM on the simulation. The amount Q for increasing the punch model in the simulation is set to 10 mm on the front side of the press brake 1 as in the movement amount L. The amount of the press brake 1 to be increased in a direction other than the front side is not particularly limited. The punch model enlarged in FIG. 7 is referred to as PM.

(Example of determination by the interference determination unit 103)
Next, a determination example by the interference determination unit 103 will be described with reference to FIG.

As shown in FIG. 8, before the punch model PM is moved to the front side (FR direction shown in FIG. 1) of the press brake 1 in the simulation, that is, in the relationship between the punch model PM and the work model WM, the punch is punched in the simulation. There is a gap between the model PM and the work model WM. Therefore, it is difficult to determine whether or not the worker M holds his / her hand between the work W and the punch 3 during the bending process of the work W or after the bending process is completed. Therefore, the interference determination unit 103 grasps the relationship between the punch model PM'moved by the model processing unit 102 and the work model WM. When the work model WM is bent by the punch model PM before being machined (moved) by the model processing unit 102, the work model WM is machined (moved) by the model processing unit 102. It is determined whether or not interference occurs in a state of invading the inside. As shown in the region R of FIG. 8, a part of the work model WM has invaded the punch model PM'after the movement. The work model WM does not show a model related to a specific process, but shows a model related to an arbitrary process. This also applies to FIGS. 10 to 13 described later.

In such a state, the interference determination unit 103 determines that the interference in which the work model WM has invaded the punch model PM'has occurred. In such a state, as described above, the worker M may get injured by pinching his / her hand between the work W and the punch 3 during the bending process of the work W or after the bending process is completed. There is a risk of doing. Therefore, when the interference determination unit 103 determines that interference occurs, the control unit 104 executes a predetermined process for improving the safety of the press brake 1. For example, the control unit 104 slows down the lowering speed of lowering the upper table 19 after the punch 3 comes into contact with the work W. This decrease in the descending speed is executed regardless of the stepping operation of the operator M. As a result, the worker M can know that his / her stepping operation is not reflected, and can know that there is a possibility of injury. As described above, according to the present embodiment, safety during or after bending can be ensured.

Further, as shown in FIG. 9, the control unit 104 may display an image on the display 300 that calls attention to the worker M. The worker M who sees this image can know that there is a possibility of injury and can prepare for the injury. Alternatively, the control unit 104 may use voice to call the worker M to call attention.

As shown in FIG. 8, when the work model WM has invaded the punch model PM', there is no portion for gripping the work model WM on the simulation. Here, even if a part of the work model WM has invaded the punch model PM', there may be a part that grips the work model on the simulation depending on the work model. For example, in the case of the work model WM as shown in FIG. 10 or 11, even if a part of the work model WM has invaded the punch model PM', the work model is simulated as shown in the region R. There is a part that grips the WM. In such a case, the control unit 104 does not execute a predetermined process for improving the safety of the press brake 1. This is because it is unlikely that the worker M will pinch his / her hand between the work W and the punch 3 during the bending process of the work W or after the bending process is completed. The portion where the work model can be gripped on the simulation may be expressed as a portion where the work model does not penetrate into the punch model. If there is a part that can grip the work model in the simulation, it is assumed that there is a part that can be gripped in the actual machine.

As an example, as shown in FIG. 12, the region where the interference determination unit 103 determines whether or not interference occurs in which the work model has penetrated into the punch model is the press brake 1 from the center of the mold. This is the front side of. In the present embodiment, the center of the mold is defined as the tip of the punch 3. In the region from the center of the die to the rear side of the press brake 1, it is not determined whether or not interference has occurred. The reason is that it is not expected that the worker M's hand will enter the area behind the press brake 1 during the bending process of the work W or after the bending process is completed. is there. The region for determining whether or not interference has occurred may be an region above a position separated from the die 5 by a predetermined distance.

If there is a portion of the work model that has not penetrated into the punch model as shown in FIGS. 10 to 11 on the front side of the press brake 1 from the center of the mold, the work model is inside the punch model in the interference determination unit 103. The length of the portion that does not invade the device may be measured to determine whether the measured length is equal to or less than the threshold value. Then, when the measured length is equal to or less than the threshold value, the worker M holds his / her hand between the work W and the punch 3 during the bending process of the work W or after the bending process is completed. Since there is a risk of injury, the control unit 104 can slow down the lowering speed of lowering the upper table 19 or display an image on the display 300 to call attention to the operator M. If the measured length is longer than the threshold value, the control unit 104 does not execute a predetermined process for improving the safety of the press brake 1.

Next, an operation example of the interference determination device 10 will be described with reference to the flowcharts of FIGS. 13 to 14.

In step S101, since the worker M performs the bending process, the screen of the display 300 is switched to the screen for performing the bending process.

Proceeding to step S103, when the screen of the display 300 transitions to the screen for bending, the acquisition unit 101 acquires various models from the database 200. The process proceeds to step S105, and the model processing unit 102 executes the offset process. The offset process is a process of arranging various models in a virtual space so as to correspond to an actual machine. After the offset processing, the model processing unit 102 moves or enlarges the punch model PM toward the front side (FR direction shown in FIG. 1) of the press brake 1 in the simulation (see FIGS. 6 to 7).

The process proceeds to step S107, and the interference determination unit 103 grasps the relationship between the punch model PM'moved by the model processing unit 102 and the work model WM. Specifically, the interference determination unit 103 determines whether or not interference has occurred in which the work model WM has invaded the punch model PM'. If no interference has occurred (NO in step S107), the process proceeds to step S115. on the other hand. If interference has occurred (YES in step S107), the process proceeds to step S109. In step S107, when a part of the work model WM has invaded the punch model PM', the process may proceed to step S109, and all of the work model WM has invaded the punch model PM'. In some cases, the process may proceed to step S109. This flowchart shows a case where a part of the work model WM has invaded the punch model PM'.

In step S109, the interference determination unit 103 measures the length of the portion where the work model does not penetrate into the punch model, and determines whether or not the measured length is equal to or less than the threshold value. As shown in the region R of FIGS. 10 to 11, when the measured length is longer than the threshold value, the interference determination unit 103 determines that there is a portion (grip position) where the work model can be gripped on the simulation. When there is a gripping position (YES in step S109), the interference determination unit 103 stores in the database 200 that there is a gripping position for each step (step S111). On the other hand, when there is no gripping position (NO in step S109), the interference determination unit 103 stores in the database 200 that there is no gripping position for each step (step S113). A series of processes is repeated until the determination of all the bending processes is completed. When the determination of all the steps of the bending process is completed (YES in step S115), the process proceeds to step S117.

If the database 200 stores that there is a gripping position in a predetermined step (for example, the first step) in step S117, the process proceeds to step S123. On the other hand, if it is stored in the database 200 that there is no gripping position in the predetermined step, the process proceeds to step S119. In step S119, the control unit 104 displays an image on the display 300 that calls attention to the worker M as shown in FIG. As a result, the worker M can know that there is a possibility of injury and can prepare for the injury. The process proceeds to step S121, and the control unit 104 hides the image that calls attention.

In step S123, the worker M operates the NC device (interference determination device 10) to display a work instruction or design drawing related to the work W on the display 300, confirms the work content, and then provides the interference determination device 10. Press the start button. The process proceeds to step S125, and if the database 200 stores that there is a gripping position in a predetermined step (YES in step S125), the process proceeds to step S127. In step S127, the operator M steps on the foot switch device 29 to start bending (step S137).

On the other hand, if it is stored in the database 200 that there is no gripping position in the predetermined step (NO in step S125), the process proceeds to step S129. In step S129, the control unit 104 again displays an image on the display 300 that calls attention to the operator M as shown in FIG. As a result, the worker M can know again that there is a possibility of injury and can prepare for the injury. The process proceeds to step S131, and the control unit 104 hides the image that calls attention. The process proceeds to step S133, and the worker M steps on the foot switch device 29 to start the bending process. At this time, the control unit 104 slows down the lowering speed of lowering the upper table 19 after the punch 3 comes into contact with the work W (step S135). This decrease in the descending speed is executed regardless of the stepping operation of the worker M performed in step S133. As a result, the worker M can know that his / her stepping operation is not reflected, and can know that there is a possibility of injury. The process of steps S125 to S137 is repeatedly carried out until the final step of the bending process.

(Action / effect)
The safety device (interference determination device 10) of the press brake 1 according to the present embodiment includes an acquisition unit 101, a model processing unit 102, an interference determination unit 103, and a control unit 104. The acquisition unit 101 acquires a work model WM and a punch model PM that model the plate-shaped work W and the punch 3, respectively. The model processing unit 102 moves the punch model PM acquired by the acquisition unit 101 to the front side of the press brake 1 in the simulation, or enlarges the punch model PM in the simulation. In the simulation, when the work model WM is bent by the punch model PM, the interference determination unit 103 causes interference in which the work model WM has invaded the punch model PM'processed by the model processing unit 102. Determine whether or not to do so. When the interference determination unit 103 determines that interference occurs, the control unit 104 executes a predetermined process for improving the safety of the press brake 1. As a result, safety during or after bending can be ensured.

Further, the control unit 104 slows down the lowering speed of lowering the upper table 19 on which the punch 3 is mounted after the punch 3 comes into contact with the work W. This decrease in the descending speed is executed regardless of the stepping operation of the operator M. As a result, the worker M can know that his / her stepping operation is not reflected, and can know that there is a possibility of injury during or after the bending process. As a result, safety during or after bending can be ensured.

In addition, the control unit 104 calls attention to the worker M who performs the bending process. For example, as shown in FIG. 9, the control unit 104 displays an image on the display 300 that calls attention to the worker M. The worker M who sees this image can know that there is a possibility of injury and can prepare for the injury. Alternatively, the control unit 104 may use voice to call the worker M to call attention. Even when the sound is used, the same effect as when the image is displayed can be obtained.

Further, when the interference determination unit 103 determines that interference occurs, it further determines whether or not there is a portion where the work model does not invade the punch model PM', and the work model is in the punch model PM'. Measure the length of the part that does not penetrate into. When the length measured by the interference determination unit 103 is equal to or less than the threshold value, the control unit 104 executes a predetermined process for improving the safety of the press brake 1. On the other hand, when the length measured by the interference determination unit 103 is longer than the threshold value, the control unit 104 does not execute a predetermined process for improving the safety of the press brake 1. If the length measured by the interference determination unit 103 is longer than the threshold value, a hand is placed between the work W and the punch 3 while the worker M is bending the work W or after the bending work is completed. This is because it is unlikely to pinch. In this way, safe and efficient work can be realized by switching the control according to the length measured by the interference determination unit 103.

Although embodiments of the present invention have been described above, the statements and drawings that form part of this disclosure should not be understood to limit the invention. Various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art from this disclosure.

In the above-described example, as a predetermined process for improving the safety of the press brake 1, the lowering speed at which the upper table 19 is lowered after the punch 3 comes into contact with the work W is slowed down, and the worker M is alerted. Although it has been described that the image is displayed on the display 300, the present invention is not limited to this. The predetermined process for improving the safety of the press brake 1 may be any process that can make the operator M aware that there is a risk of injury. For example, the upper table 19 may be operated regardless of the stepping operation of the operator M. It may be a process of stopping the descent.

When modeling the work model, the plate thickness, bending angle after each process, flange length, etc. are taken into consideration.

1 Press brake 3 Punch 5 Die 9 Side plate 10 Interference judgment device 13 Level bolt 15 Lower table 17 Die holder 19 Upper table 21 Punch holder 25 Back gauge device 27 Butting member 29 Foot switch device 31 Guide member 37 Slide member 45 Pedal case 47 Hinge 101 Acquisition unit 102 Model processing unit 103 Interference judgment unit 104 Control unit 200 Database 300 Display W work

Claims (6)

An acquisition unit that acquires a work model and punch model that model plate-shaped workpieces and punches, respectively.
A model processing unit that moves the punch model acquired by the acquisition unit to the front side of the press brake in the simulation, or enlarges the punch model in the simulation.
On the simulation, it is determined whether or not interference occurs when the work model is bent by the punch model and the work model is invaded into the punch model processed by the model processing unit. Interference judgment unit and
A press brake safety device including a control unit that executes a predetermined process for improving the safety of the press brake when the interference determination unit determines that the interference occurs. The press brake safety device according to claim 1, wherein the control unit slows down the lowering speed of lowering the upper table on which the punch is mounted after the punch comes into contact with the work. The press brake safety device according to claim 1 or 2, wherein the control unit calls attention to an operator performing the bending process. When the interference determination unit determines that the interference occurs, it further determines whether or not there is a portion where the work model does not invade the punch model, and the work model is in the punch model. Measure the length of the non-invading part and
Any of claims 1 to 3, wherein the control unit executes a predetermined process for improving the safety of the press brake when the length measured by the interference determination unit is equal to or less than a threshold value. The press brake safety device according to item 1. The simulation is a bending simulation for verifying a bending process in which the work sandwiched between the punch and the die is plastically deformed by lowering the upper table on which the punch is mounted. The press brake safety device according to any one of 4. Obtain a work model and punch model that model plate-shaped workpieces and punches, respectively.
The punch model is moved to the front side of the press brake in the simulation, or the punch model is enlarged in the simulation.
On the simulation, when the work model is bent by the punch model, it is determined whether or not interference occurs in which the work model has penetrated into the punch model.
A method for controlling a press brake safety device, which comprises executing a predetermined process for improving the safety of the press brake when it is determined that the interference occurs.

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