Press brake control device and bending speed calculation method

Abstract

When performing bending on a workpiece using a press brake, an appropriate bending speed corresponding to the workpiece is calculated. 【Solution means】The press brake control device 1 includes a storage unit 3 that stores the processing conditions 11 when performing bending on a workpiece using the press brake 7, and a control unit 5 that calculates the bending speed when performing bending on a workpiece using the press brake 7 based on the processing conditions 11. The control unit 5 acquires the plate thickness of the workpiece from the processing conditions 11, sets an appropriate value of the upward bounce speed at which the operator can work comfortably among the upward bounce speeds of the gripping portion where the operator grips the workpiece based on the plate thickness of the workpiece, calculates a speed conversion parameter for converting the upward bounce speed into the bending speed based on the processing conditions 11, and calculates the bending speed based on the appropriate value of the upward bounce speed and the speed conversion parameter.

Description

Technical Field

[0001] The present invention relates to a press brake control device and a bending speed calculation method.

Background Art

[0002] Generally, in an NC device, the initial value of the bending speed when performing bending work on a workpiece with a press brake is uniformly set to the same value. Although it is possible to change the bending speed according to the workpiece size, etc., it is difficult for inexperienced operators to change it to an appropriate bending speed. Therefore, in the bending device described in Patent Document 1, the bending speed was calculated based on the average value of the working speed of the operator during bending work.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above-described conventional bending device, since the bending speed is calculated based on the average value of the working speed of the operator, the springback speed may be too fast for a large-sized workpiece, and there is a possibility that the operator cannot work comfortably. Therefore, the conventional bending device has a problem that it cannot calculate an appropriate bending speed according to the workpiece.

Means for Solving the Problems

[0005] A first aspect of one or more embodiments includes a storage unit that stores processing conditions when bending a workpiece with a press brake, and a control unit that calculates a bending speed when bending the workpiece with the press brake based on the processing conditions. The control unit acquires the plate thickness of the workpiece from the processing conditions, sets an appropriate bounce-up speed value at which an operator can work comfortably among the bounce-up speeds of the gripping portion that grips the workpiece based on the plate thickness of the workpiece, calculates a speed conversion parameter for converting the bounce-up speed to the bending speed based on the processing conditions, and calculates the bending speed based on the appropriate bounce-up speed value and the speed conversion parameter. It is a press brake control device.

[0006] A second aspect of one or more embodiments is a bending speed calculation method for calculating a bending speed when bending a workpiece with a press brake based on processing conditions when bending the workpiece with the press brake. The method includes acquiring the plate thickness of the workpiece from the processing conditions, setting an appropriate bounce-up speed value at which an operator can work comfortably among the bounce-up speeds of the gripping portion that grips the workpiece based on the plate thickness of the workpiece, calculating a speed conversion parameter for converting the bounce-up speed to the bending speed based on the processing conditions, and calculating the bending speed based on the appropriate bounce-up speed value and the speed conversion parameter.

Advantages of the Invention

[0007] According to the press brake control device and the bending speed calculation method according to one or more embodiments, an appropriate bending speed corresponding to the workpiece can be calculated when bending the workpiece with a press brake.

Brief Description of the Drawings

[0008]

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DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, with reference to the drawings, the press brake control device and the bending speed calculation method according to the present embodiment will be described.

[0010] [Configuration of Press Brake Control Device] Referring to FIG. 1, the configuration of the press brake control device according to the present embodiment will be described. FIG. 1 is a block diagram showing the configuration of the press brake control device according to the present embodiment. As shown in FIG. 1, the press brake control device 1 includes a storage unit 3 and a control unit 5, and is connected to the press brake 7.

[0011] The press brake control device 1 is an NC (Numerical Control) device that controls the bending process of the press brake 7. In particular, it calculates the bending speed when the press brake 7 moves the upper and lower tables relative to each other for bending. The press brake control device 1 is composed of a computer having a memory, a processor such as a CPU (Central Processing Unit), and various interfaces.

[0012] The storage unit 3 is a memory that stores the processing conditions 11 when bending the workpiece with the press brake 7. The processing conditions 11 are data recording the conditions for bending the workpiece performed by the press brake 7, including the workpiece length L, workpiece width W, and bending length B of the workpiece 20 shown in FIG. 2. In addition, it at least includes the plate thickness, mass, material, and die information of the workpiece 20. The die information at least includes the depth value (D value) and the groove width of the die (V width). Further, the processing conditions 11 also include the proper value of the springback speed described later.

[0013] The workpiece length L is the length from the bending line 21 of the workpiece to the gripping portion 23 where the operator grips the workpiece, and the bending length B is the length of the bending line 21 of the workpiece. Note that the workpiece length L is the length of the workpiece 20 in the direction perpendicular to the bending line 21, and the workpiece width W is the length of the workpiece 20 in the direction parallel to the bending line 21. In addition, the processing conditions 11 include the developed dimensions of the workpiece and, as bending line information, the bending angle, bending direction, elongation value, inner diameter, etc.

[0014] Furthermore, the storage unit 3 stores a processing program 13 that records the process of performing the bending process of the workpiece with the press brake 7. In particular, the processing program 13 records data on the bending speed set in the past.

[0015] The control unit 5 is a controller that controls the bending process of the workpiece performed by the press brake 7. In particular, the control unit 5 calculates the bending speed when bending the workpiece with the press brake 7 based on the processing conditions 11. The bending speed is the speed at which the punch or die of the press brake 7 moves up and down when bending the workpiece.

[0016] Specifically, the control unit 5 obtains the thickness of the workpiece from the processing conditions 11, and based on the thickness of the workpiece, sets an appropriate bounce-up speed value at which the operator can work comfortably among the bounce-up speeds of the gripping portion where the operator grips the workpiece. Then, the control unit 5 calculates a speed conversion parameter for converting the bounce-up speed into the bending speed based on the processing conditions 11, and calculates the bending speed based on the appropriate bounce-up speed value and the speed conversion parameter.

[0017] The control unit 5 is composed of a controller having a memory, a processor such as a CPU (Central Processing Unit), and various interfaces. The memory and various interfaces are connected to the processor via a bus. By executing the program stored in the memory by the processor, the control unit 5 executes the process of calculating the bending speed.

[0018] The press brake 7 is a processing machine that performs a bending process on the workpiece by pressing the workpiece with a punch arranged on the upper table and a die arranged on the lower table. The press brake control device 1 controls the press brake 7 to perform a bending process on the workpiece according to the processing program 13 stored in the storage unit 3. In particular, the press brake 7 performs a bending process on the workpiece at the bending speed set by the press brake control device 1.

[0019] [Method for Calculating Bending Speed] Next, a method for calculating the bending speed by the press brake control device 1 according to the present embodiment will be described. FIG. 3 is a flowchart showing the processing procedure of the bending speed calculation process by the press brake control device 1.

[0020] As shown in FIG. 3, in step S101, the control unit 5 sets an appropriate value for the bounce-up speed. The appropriate value for the bounce-up speed is the bounce-up speed at which the operator can work comfortably among the bounce-up speeds of the gripping portion that grips the workpiece, and a plurality of appropriate values for the bounce-up speed are stored in the storage unit 3 in advance.

[0021] Here, a method for setting the appropriate value for the bounce-up speed will be described with reference to FIG. 4. FIG. 4 is a diagram showing the evaluation results by the operator of the bounce-up speed in the bending process. As shown in FIG. 4, when the plate thickness t of the workpiece is 0.6 mm, 1.0 mm, and 3.2 mm respectively, the bending process is performed while changing the workpiece length L to 600 mm, 1200 mm, and 1700 mm, and the results of the operator's evaluation of each bounce-up speed U are described.

[0022] In FIG. 4, the x marks indicate the bounce-up speeds at which the operator could not work comfortably, for example, when processing defects such as waist breakage occurred or when the operator felt that the bounce-up speed was too fast. The ○ marks indicate the bounce-up speeds at which the operator felt that they could work comfortably.

[0023] As shown in FIG. 4, when the plate thickness t of the workpiece is 0.6 mm, the operator feels that they can work comfortably when the bounce-up speed U is around 370 mm / sec. On the other hand, when the plate thickness t is 1.0 mm or more, the operator feels that they can work comfortably when the bounce-up speed U is around 520 mm / sec. Therefore, when the plate thickness t is less than 1.0 mm, the appropriate value for the bounce-up speed U 0 is set to 370 mm / sec, and when the plate thickness t is 1.0 mm or more, the appropriate value for the bounce-up speed U 0 is set to 520 mm / sec.

[0024] In this way, the appropriate value for the bounce-up speed U 0 at which the operator can work comfortably is set in advance and stored in the storage unit 3. Therefore, the control unit 5 acquires the plate thickness t of the workpiece from the processing condition 11 of the storage unit 3, and based on the acquired plate thickness t of the workpiece, the appropriate value for the bounce-up speed U 0Set it. In particular, the storage unit 3 stores a plurality of proper spring-up speed values U set according to the plate thickness t of the workpiece, so the control unit 5 selects and sets any one of the plurality of proper spring-up speed values U based on the plate thickness t of the workpiece. 0 Since it stores 0 , the control unit 5 selects and sets any one of the plurality of proper spring-up speed values U based on the plate thickness t of the workpiece. 0 Select and set any one from among them.

[0025] In step S103, the control unit 5 determines whether the workpiece length L is greater than a predetermined value. If it is greater than the predetermined value, it proceeds to step S105; if it is less than or equal to the predetermined value, it proceeds to step S107.

[0026] In step S105, when it is determined in step S103 that the workpiece length L is greater than the predetermined value, the control unit 5 calculates a correction value LA set to a value smaller than the workpiece length L. When the workpiece length L becomes larger exceeding the predetermined value, the operator will grip the side surface of the workpiece instead of the gripping portion 23 shown in FIG. 2. That is, the length from the bending line 21 to the portion actually gripped by the operator becomes shorter. Therefore, when the workpiece length L is greater than the predetermined value, a correction value LA that is a value smaller than the workpiece length L is calculated.

[0027] For example, as shown in FIG. 5, when the workpiece length L is 1200 mm or less, the operator grips the gripping portion 23 in FIG. 2, so the length Lx from the bending line 21 to the portion actually gripped by the operator coincides with the workpiece length L. That is, Lx = L (L ≤ 1200).

[0028] On the other hand, when the workpiece length L exceeds 1200 mm, the operator grips the side surface of the workpiece from the side, so the length Lx from the bending line 21 to the portion actually gripped by the operator becomes smaller than the workpiece length L. Therefore, the predetermined value is set to 1200 mm, and when the workpiece length L is greater than 1200 mm, the correction value LA is set. This correction value LA can be expressed by the following formula (1). Here, a and b are positive constants. [Equation 1] Lx = LA = aL + b (L > 1200) (1)

[0029] When the work length L is greater than 1200 mm, this formula (1) is set by examining where the operator actually grips the side of the work. As shown in FIG. 5, the correction value LA is set to a value smaller than the work length L. For example, when the work length L is 1500 mm, the correction value LA is 1300 mm, so it is set to a value smaller than 1500 mm.

[0030] In step S107, the control unit 5 calculates a speed conversion parameter f(L) that converts the bounce-up speed to the bending speed based on the processing condition 11. Here, with reference to FIG. 6, the calculation method of the speed conversion parameter f(L) will be described. As shown in FIG. 6, when performing a bending process on the work 20, the following relationship of formula (2) holds among the depth value D, the groove width V of the die, and the moving distance H of the gripping portion 23.

Number

[0031] That is, the ratio of the distance bent downward (depth value D) to the moving distance H of the gripping portion 23 is approximately equal to the ratio of half of the groove width V of the die to the distance obtained by subtracting half of the groove width V from the work length L.

[0032] When formula (2) is expanded, it becomes the following formula (3).

Number

[0033] When formula (3) is further calculated, it becomes the following formula (4), and D / H becomes the speed conversion parameter f(L). As shown in formula (4), the speed conversion parameter f(L) can be calculated by obtaining the groove width V of the die and the work length L from the processing condition 11.

Number

[0034] Therefore, the control unit 5 acquires the groove width V of the die used in the press brake 7 from the processing condition 11 and the workpiece length L which is the length from the bending line of the workpiece to the gripping portion, and calculates the speed conversion parameter f(L) based on the groove width V of the die and the workpiece length L.

[0035] Also, when the correction value LA of the workpiece length L is calculated in step S105, as shown in FIG. 7, the gripping portion 23 changes to the gripping portion 23A. Therefore, the speed conversion parameter f(L) may be calculated by the following formula (5) by replacing the workpiece length L in formula (4) with the correction value LA.

Equation

[0036] That is, when the workpiece length L is greater than a predetermined value, the control unit 5 calculates a correction value LA set to a value smaller than the workpiece length L, and calculates the speed conversion parameter f(L) based on the groove width V of the die and the correction value LA.

[0037] In step S109, the control unit 5 calculates the reference bending speed F 0 The reference bending speed F 0 can be calculated by converting the bounce-up speed appropriate value U 0 set in step S101 to the bending speed with the speed conversion parameter f(L). Specifically, the reference bending speed F 0 can be calculated by the following formula (6), and can be calculated by multiplying the bounce-up speed appropriate value U 0 and the speed conversion parameter f(L).

Equation

[0038] Also, when the correction value LA of the workpiece length L is calculated in step S105, the reference bending speed F 0 can be calculated by the following formula (7) by replacing the workpiece length L with the correction value LA.

Number

[0039] In step S111, the control unit 5 obtains the mass M of the workpiece from the processing condition 11, determines whether the mass M of the workpiece is greater than or equal to a predetermined value. If it is greater than or equal to the predetermined value, it proceeds to step S113. If it is less than the predetermined value, it proceeds to step S115. The mass M may be recorded in the processing condition 11 in advance, or the area of the workpiece may be recorded in the processing condition 11, and the mass M may be obtained by multiplying this area by the plate thickness and the specific gravity. Further, the workpiece may be photographed by a camera provided on the press brake 7, the area of the workpiece may be obtained by image processing, and the mass M may be calculated by multiplying this area by the plate thickness and the specific gravity.

[0040]

[0041] When the mass M of the workpiece is less than, for example, 25 kg, bending can be performed without problems at the reference bending speed F 0 , but when it exceeds 25 kg, the burden on the operator becomes large at the reference bending speed F 0 , and verification results show that many people feel that the reference bending speed F 0 is fast.

[0042] Therefore, as shown in FIG. 8, the predetermined value is set to 25 kg, and when the mass M is 25 kg or more, the mass deceleration parameter f(M) is calculated. The mass deceleration parameter f(M) can be expressed by the following formula (8). Here, c and d are positive constants. [Equation 8] f(M)=-cM + d (8)

[0043] ​As shown in Fig. 8 and Equation (8), the mass deceleration parameter f(M) is 1 when the mass M is less than 25 kg, and f(M) decreases as the mass M increases when the mass M is 25 kg or more. Therefore, the calculated bending speed becomes slower as the mass M increases when the mass M is 25 kg or more.

[0044] In step S115, the control unit 5 acquires the work width W and the bending length B which is the length of the bending line of the work from the processing condition 11, and determines whether or not the bending line ratio B / W which is the ratio of the bending length B to the work width W is less than a predetermined value. Then, if the bending line ratio B / W is less than the predetermined value, the process proceeds to step S117, and if it is greater than or equal to the predetermined value, the process proceeds to step S119.

[0045] In step S117, when the bending line ratio B / W is less than the predetermined value in step S115, the control unit 5 calculates a width deceleration parameter f(B) for decelerating the bending speed.

[0046] When the bending length B becomes smaller than the work width W, there is a possibility of buckling even when bending is performed at the reference bending speed F 0 Therefore, as a result of verification, it was found that when the bending length B is less than 0.3 times the work length W, it is necessary to slow down the bending speed.

[0047] Therefore, as shown in Fig. 9, the predetermined value is set to 0.3, and the width deceleration parameter f(B) is calculated when the bending line ratio B / W is less than 0.3. The width deceleration parameter f(B) can be expressed by the following Equation (9). Here, e and g are positive constants. [Equation 9] f(B)=e(B / W)+g (9)

[0048] As shown in FIG. 9 and Equation (9), the width deceleration parameter f(B) becomes f(B)=1 when the bending line ratio B / W is 0.3 or more, and f(B) decreases as the bending line ratio B / W decreases when the bending line ratio B / W is less than 0.3. Therefore, the calculated bending speed becomes slower as the bending line ratio B / W decreases when the bending line ratio B / W is less than 0.3.

[0049] In step S119, the control unit 5 calculates the bending speed F. Specifically, the control unit 5 calculates the bending speed F using the following equation (10). [Equation 10] F = F 0 ×f(M)×f(B) (10)

[0050] That is, the bending speed F can be calculated by multiplying the reference bending speed F 0 by the mass deceleration parameter f(M) and the width deceleration parameter f(B). Therefore, when the mass deceleration parameter f(M) and the width deceleration parameter f(B) are "1" without proceeding to steps S113 and S117, the bending speed F becomes the reference bending speed F 0 . That is, the control unit 5 calculates the bending speed F based on the bounce-up speed appropriate value U 0 and the speed conversion parameter f(L).

[0051] Also, when the mass deceleration parameter f(M) is calculated in step S113, the bending speed F is calculated by multiplying the reference bending speed F 0 by the mass deceleration parameter f(M). Therefore, the control unit 5 calculates the bending speed F based on the bounce-up speed appropriate value U 0 and the speed conversion parameter f(L) and the mass deceleration parameter f(M).

[0052] Furthermore, when the width deceleration parameter f(B) is calculated in step S117, the bending speed F is calculated by multiplying the reference bending speed F 0 by the width deceleration parameter f(B). Therefore, the control unit 5 calculates the bending speed F based on the bounce-up speed appropriate value U 0The bending speed F is calculated based on the speed conversion parameter f(L) and the width deceleration parameter f(B).

[0053] Also, when both the mass deceleration parameter f(M) and the width deceleration parameter f(B) are calculated in steps S113 and S117, the bending speed F is the reference bending speed F 0 multiplied by the mass deceleration parameter f(M) and the width deceleration parameter f(B). Therefore, the control unit 5 calculates the bending speed F based on the bounce-up speed appropriate value U 0 the speed conversion parameter f(L), the mass deceleration parameter f(M), and the width deceleration parameter f(B).

[0054] In step S121, the control unit 5 sets the bending speed for the press brake 7. The control unit 5 may set the bending speed F calculated in step S119 directly for the press brake 7, or may set it using a preset F value.

[0055] Generally, in an NC device, values F1 to F9 are set as default F values for the bending speed. Therefore, the press brake control device 1 may also set values F1 to F9 as default F values and use these F values to set the bending speed of the press brake 7. For example, among the F values smaller than the bending speed F calculated in step S119, the closest F value may be set for the press brake 7.

[0056] Also, when setting the bending speed, since data on the bending speed set in the past is recorded in the machining program, the control unit 5 outputs an alarm to the operator when the bending speed set in the past is faster than the bending speed F calculated in step S119. For example, as shown in FIG. 10, an alarm message may be displayed on the operation screen, or an alarm may be notified simultaneously. When the bending speed is set for the press brake 7 in this way, the calculation process for the bending speed according to this embodiment ends.

[0057] [Effects of the Embodiment] As described in detail above, in the press brake control device 1 according to the present embodiment, the control unit 5 acquires the plate thickness t of the workpiece from the processing conditions 11, and based on the plate thickness t of the workpiece, the appropriate value U of the springback speed at which the operator can work comfortably 0 is set. Then, the control unit 5 calculates a speed conversion parameter f(L) for converting the springback speed into the bending speed based on the processing conditions 11, and calculates the bending speed F based on the appropriate value U 0 of the springback speed and the speed conversion parameter f(L). Thereby, the appropriate value U of the springback speed at which the operator can work comfortably 0 is set based on the plate thickness t of the workpiece, and this appropriate value U 0 of the springback speed is converted to calculate the bending speed F, so that an appropriate bending speed according to the workpiece can be calculated.

[0058] Conventionally, when the size of the workpiece is large, the springback speed may be too fast for the operator to work comfortably. Also, when the bending speed is high, the thinner the plate thickness, the more likely it is that a processing defect called "waist breakage" occurs, in which the portion near the bending line is distorted. On the other hand, if the bending speed is too slow, the time for the operator to support until the bending is completed becomes long, so the tact time increases and the productivity decreases. However, in the press brake control device 1 according to the present embodiment, since an appropriate bending speed according to the workpiece can be calculated, the operator can work comfortably, and the occurrence of processing defects and the decrease in productivity can be prevented.

[0059] Also, in the press brake control device 1 according to the present embodiment, the control unit 5 acquires the mass M of the workpiece from the processing conditions 11, and when the mass M of the workpiece is equal to or greater than a predetermined value, calculates a mass deceleration parameter f(M) for decelerating the bending speed. Then, the control unit 5 calculates the bending speed F based on the appropriate value U 0 of the springback speed, the speed conversion parameter f(L), and the mass deceleration parameter f(M). Thereby, even when the mass of the workpiece increases, an appropriate bending speed according to the workpiece can be calculated, so that the operator can work comfortably, and the occurrence of processing defects and the decrease in productivity can be prevented.

[0060] Furthermore, in the press brake control device 1 according to the present embodiment, the control unit 5 obtains the work width W and the bending length B of the work from the processing conditions 11, and calculates a width reduction parameter f(B) for reducing the bending speed when the ratio of the bending length B to the work width W is less than a predetermined value. Then, the control unit 5 calculates the bending speed F based on the proper springback speed value U 0 and the speed conversion parameter f(L) and the width reduction parameter f(B). As a result, even when the bending length B becomes smaller than the work width W, an appropriate bending speed corresponding to the work can be calculated, so that the operator can work comfortably, and the occurrence of processing defects and the reduction of productivity can be prevented.

[0061] Also, in the press brake control device 1 according to the present embodiment, the storage unit 3 stores a plurality of proper springback speed values U 0 set according to the plate thickness t of the work, and the control unit 5 selects and sets any one of the plurality of proper springback speed values U 0 based on the plate thickness t of the work. As a result, an appropriate proper springback speed value U 0 can be set only by selecting from the storage unit 3.

[0062] Furthermore, in the press brake control device 1 according to the present embodiment, the control unit 5 obtains the groove width V of the die and the work length L from the processing conditions 11, and calculates a speed conversion parameter f(L) based on the groove width V of the die and the work length L. Thereby, the springback speed can be appropriately converted into the bending speed according to the work length L.

[0063] Also, in the press brake control device 1 according to the present embodiment, when the work length L is greater than a predetermined value, the control unit 5 calculates a correction value LA set to a value smaller than the work length L, and calculates a speed conversion parameter f(L) based on the groove width V of the die and the correction value LA. As a result, even when the work length L becomes longer and the operator grips the side surface of the work, an appropriate speed conversion parameter f(L) can be calculated.

[0064] Furthermore, in the press brake control device 1 according to the present embodiment, the storage unit 3 stores a machining program 13 that records the process of performing bending of the workpiece with the press brake 7, and the machining program 13 records data on the bending speed set in the past. When the bending speed set in the past is faster than the calculated bending speed F, the control unit 5 outputs an alarm to the operator. Thereby, even when a high bending speed has been set in the past for reasons such as work efficiency, the operator can be alerted.

[0065] As described above, embodiments of the present invention have been described, but it should not be understood that the descriptions and drawings forming a part of this disclosure limit the present invention. Various alternative embodiments, examples, and operation techniques will be apparent to those skilled in the art from this disclosure.

Explanation of Reference Numerals

[0066] 1 Press brake control device 3 Storage unit 5 Control unit 7 Press brake 11 Machining conditions 13 Machining program 20 Workpiece 21 Bending line 23, 23A Gripping portion B Bending length D Depth value F Bending speed H Moving distance of the gripping portion L Workpiece length LA Correction value U Springback speed V Groove width W Workpiece width

Claims

1. A memory unit that stores processing conditions when bending a workpiece with a press brake; A control unit that calculates a bending speed when bending the workpiece by the press brake based on the processing conditions, The control unit is A plate thickness of the workpiece is obtained from the processing conditions, and based on the plate thickness of the workpiece, a proper jump-up speed value is set that allows the operator to work comfortably among the jump-up speeds of a gripping portion that grips the workpiece by the operator; Calculating a speed conversion parameter for converting the jump speed into the bending speed based on the processing conditions; The bending speed is calculated based on the appropriate jump speed value and the speed conversion parameter. Press brake control device.

2. The control unit is A mass of the workpiece is obtained from the processing conditions, and when the mass of the workpiece is equal to or greater than a predetermined value, a mass deceleration parameter for decelerating the bending speed is calculated; The bending speed is calculated based on the appropriate jump speed value, the speed conversion parameter, and the mass deceleration parameter. The press brake control device according to claim 1.

3. The control unit is A workpiece width and a bending length, which is a length of a bending line of the workpiece, of the workpiece are obtained from the processing conditions, and when a ratio of the bending length to the workpiece width is less than a predetermined value, a width deceleration parameter is calculated to decelerate the bending speed; The bending speed is calculated based on the jump-up speed proper value, the speed conversion parameter, and the width deceleration parameter. The press brake control device according to claim 1 or 2.

4. The memory unit stores a plurality of appropriate jump-up speed values ​​set according to the plate thickness of the workpiece, The control unit selects and sets one of the plurality of appropriate jump-up speed values ​​based on the plate thickness of the workpiece. The press brake control device according to claim 1.

5. The control unit acquires a groove width of a die used in the press brake and a work length, which is a length from a bend line of the work to the gripping portion, from the processing conditions, and calculates the speed conversion parameter based on the groove width of the die and the work length. The press brake control device according to claim 1.

6. The control unit calculates a correction value set to a value smaller than the work length when the work length is greater than a predetermined value, and calculates the speed conversion parameter based on the groove width of the die and the correction value. The press brake control device according to claim 5.

7. The storage unit stores a processing program that records a process for performing bending processing on the workpiece by the press brake, The processing program records data of the bending speed previously set, The control unit outputs a warning to the operator when the previously set bending speed is faster than the calculated bending speed. The press brake control device according to claim 1.

8. A bending speed calculation method for calculating a bending speed when bending a workpiece with a press brake based on processing conditions when bending the workpiece with the press brake, comprising: A plate thickness of the workpiece is obtained from the processing conditions, and based on the plate thickness of the workpiece, a proper jump-up speed value is set that allows the operator to work comfortably among the jump-up speeds of a gripping portion that grips the workpiece by the operator; Calculating a speed conversion parameter for converting the jump speed into the bending speed based on the processing conditions; The bending speed is calculated based on the appropriate jump speed value and the speed conversion parameter. How to calculate bending speed.

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