Press brake control device and bending speed calculation method

Abstract

A press brake control device (1) comprises: a storage unit (3) that stores a processing condition (11) for when a workpiece is bent using a press brake (7); and a control unit (5) that calculates a bending speed for when the workpiece is bent using the press brake (7) on the basis of the processing condition (11). The control unit (5): acquires the thickness of the workpiece from the processing condition (11); within a range of repellency speeds at which a gripping portion for the operator to grip the workpiece repellently moves upward, sets an appropriate value for the repellency speed that allows an operator to comfortably work, on the basis of the thickness of the workpiece; calculates a speed conversion parameter for converting the repellency speed to the bending speed on the basis of the processing condition (11); and calculates the bending speed on the basis of the appropriate value of the repellency speed and the speed conversion parameter.

Description

Press brake control device and bending speed calculation method

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

[0002] In general, in an NC device, the initial value of the bending speed when bending a workpiece with a press brake is set to the same value. Although the bending speed can be changed according to the workpiece size, it is difficult for an inexperienced worker to change the bending speed to an appropriate value. Therefore, the bending device described in Patent Document 1 calculates the bending speed based on the average working speed of the worker during the bending process.

[0003] Japanese Patent Application Laid-Open No. 2002-137018

[0004] However, in the conventional bending apparatus described above, the bending speed is calculated based on the average working speed of the worker, so for a large workpiece, the jump speed may be too fast, making it difficult for the worker to work comfortably. Therefore, the conventional bending apparatus has the problem of being unable to calculate an appropriate bending speed for the workpiece.

[0005] A first aspect of one or more embodiments is a press brake control device that includes a memory 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, wherein the control unit obtains the thickness of the workpiece from the processing conditions, sets an optimum bounce speed value for the bounce speed of the gripping portion that grips the workpiece, which allows the worker to work comfortably, based on the thickness of the workpiece, calculates a speed conversion parameter that converts the bounce speed to the bending speed based on the processing conditions, and calculates the bending speed based on the optimum bounce speed value and the speed conversion parameter.

[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 bending speed calculation method obtaining a thickness of the workpiece from the processing conditions, setting an optimum bounce speed value at which an operator can work comfortably among bounce speeds of a gripping portion that grips the workpiece based on the thickness of the workpiece, calculating a speed conversion parameter that converts the bounce speed to the bending speed based on the processing conditions, and calculating the bending speed based on the optimum bounce speed value and the speed conversion parameter.

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

[0008] FIG. 1 is a block diagram illustrating the configuration of a press brake control device according to an embodiment. FIG. 2 is a top view illustrating the structure of a workpiece. FIG. 3 is a flowchart illustrating the processing steps of a bending speed calculation process performed by a press brake control device according to an embodiment. FIG. 4 is a diagram illustrating the results of an operator's evaluation of the bounce speed during bending. FIG. 5 is a diagram illustrating the relationship between the length of the workpiece and the length from the bend line to the portion actually gripped by the operator. FIG. 6 is a diagram illustrating the movement of the workpiece during bending. FIG. 7 is a diagram illustrating the movement of the workpiece during bending when the workpiece is long. FIG. 8 is a diagram illustrating a mass deceleration parameter calculated by a press brake control device according to an embodiment. FIG. 9 is a diagram illustrating a width deceleration parameter calculated by a press brake control device according to an embodiment. FIG. 10 is a diagram illustrating an example of a warning message displayed by the press brake control device according to an embodiment.

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

[0010] [Configuration of the press brake control device] The configuration of the press brake control device according to this embodiment will be described with reference to Fig. 1. Fig. 1 is a block diagram showing the configuration of the press brake control device according to this embodiment. As shown in Fig. 1, the press brake control device 1 includes a memory unit 3 and a control unit 5, and is connected to a 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, and in particular calculates the bending speed when the press brake 7 moves the upper and lower tables relatively to perform the bending process. The press brake control device 1 is configured by 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 processing conditions 11 when bending a workpiece with the press brake 7. The processing conditions 11 are data recording the conditions for bending a workpiece performed with the press brake 7, and include the workpiece length L, workpiece width W, and bending length B of the workpiece 20 shown in FIG. 2, as well as the plate thickness, mass, material, and die information of the workpiece 20. The die information includes at least the depth value (D value) and the die groove width (V width). The processing conditions 11 also include an optimum jump-up speed value, which will be described later.

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

[0014] Furthermore, the memory unit 3 stores a processing program 13 that records the process of performing bending processing on a workpiece using the press brake 7, and in particular, the processing program 13 records data on bending speeds that have been set in the past.

[0015] The control unit 5 is a controller that controls the bending of the workpiece performed by the press brake 7. In particular, the control unit 5 calculates the bending speed when bending the workpiece by 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 acquires the thickness of the workpiece from the processing conditions 11, and sets an appropriate jump-up speed value that allows the worker to work comfortably among the jump-up speeds of the gripping portion that grips the workpiece based on the thickness of the workpiece. Then, the control unit 5 calculates a speed conversion parameter that converts the jump-up speed into a bending speed based on the processing conditions 11, and calculates the bending speed based on the appropriate jump-up speed value and the speed conversion parameter.

[0017] The control unit 5 is configured with 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. The control unit 5 executes a process of calculating the bending speed by having the processor execute a program stored in the memory.

[0018] The press brake 7 is a processing machine that performs bending processing on a workpiece by applying pressure to the workpiece with a punch arranged on an upper table and a die arranged on a lower table. The press brake control device 1 controls the press brake 7 to perform bending processing on the workpiece in accordance with a processing program 13 stored in the memory unit 3. In particular, the press brake 7 bends the workpiece at a 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 this embodiment will be described. Fig. 3 is a flowchart showing the processing procedure for calculating the bending speed by the press brake control device 1.

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

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

[0022] In Figure 4, the x marks indicate jump-up speeds at which the worker was unable to work comfortably, for example, when a processing defect such as bending occurred or when the worker felt that the jump-up speed was too fast. The ◯ marks indicate jump-up speeds at which the worker felt they could work comfortably.

[0023] As shown in Figure 4, when the workpiece thickness t is 0.6 mm, the worker feels comfortable working at a jump-up speed U of about 370 mm / sec. On the other hand, when the workpiece thickness t is 1.0 mm or more, the worker feels comfortable working at a jump-up speed U of about 520 mm / sec. Therefore, when the workpiece thickness t is less than 1.0 mm, the optimum jump-up speed U ０ is set to 370 mm / sec, and when the plate thickness t is 1.0 mm or more, the appropriate jump-up speed value U ０ is set to 520 mm / sec.

[0024] In this way, the optimum jumping speed U is set as the jumping speed at which the worker can work comfortably. ０ is set in advance and stored in the memory unit 3. Therefore, the control unit 5 acquires the workpiece thickness t from the processing conditions 11 in the memory unit 3, and calculates the optimum jump-up speed value U based on the acquired workpiece thickness t. ０ In particular, the storage unit 3 stores a plurality of optimum values ​​U of the jump-up speed set according to the plate thickness t of the workpiece. ０Since the value of the jump speed optimum value U is stored, the control unit 5 can calculate a plurality of jump speed optimum values ​​U based on the workpiece thickness t. ０ Select one of them and set it.

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

[0026] In step S105, if 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 that is set to a value smaller than the workpiece length L. When the workpiece length L exceeds the predetermined value, the worker begins to grip the side of the workpiece rather than the gripping portion 23 shown in FIG. 2. In other words, the length from the bending line 21 to the portion that the worker actually grips becomes shorter. Therefore, when the workpiece length L is greater than the predetermined value, the control unit 5 calculates a correction value LA that is smaller than the workpiece length L.

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

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

[0029] This formula (1) is set by examining where on the side of the workpiece the worker actually grips when the workpiece length L is greater than 1200 mm. As shown in Fig. 5, the correction value LA is set to a value smaller than the workpiece length L. For example, when the workpiece 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) for converting the jump speed into a bending speed based on the processing conditions 11. Here, a method for calculating the speed conversion parameter f(L) will be described with reference to Fig. 6. As shown in Fig. 6, when bending the workpiece 20, the relationship of the following formula (2) holds among the depth value D, the groove width V of the die, and the movement distance H of the gripping portion 23.

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

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

[0033] Further calculation of equation (3) results in the following equation (4), where D / H is the speed conversion parameter f(L). As shown in equation (4), the speed conversion parameter f(L) can be calculated by obtaining the die groove width V and workpiece length L from the machining conditions 11.

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

[0035] Furthermore, if the correction value LA for the workpiece length L has been calculated in step S105, the gripping portion 23 changes to the gripping portion 23A as shown in Fig. 7. Therefore, the workpiece length L in equation (4) can be replaced with the correction value LA, and the speed conversion parameter f(L) can be calculated using the following equation (5).

[0036] That is, 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 the speed conversion parameter f(L) based on the die groove width V and the correction value LA.

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

[0038] Furthermore, if the correction value LA for the workpiece length L has been calculated in step S105, the workpiece length L is replaced with the correction value LA, and the reference bending speed F is calculated using the following equation (7). ０ can be calculated.

[0039] In step S111, the control unit 5 obtains the mass M of the workpiece from the processing conditions 11 and determines whether the mass M of the workpiece is equal to or greater than a predetermined value. If the mass M is equal to or greater than the predetermined value, the process proceeds to step S113. If the mass M is less than the predetermined value, the process proceeds to step S115. The mass M may be pre-recorded in the processing conditions 11, or may be calculated by recording the area of ​​the workpiece in the processing conditions 11 and multiplying this area by the plate thickness and specific gravity. Furthermore, the mass M may be calculated by photographing the workpiece with a camera provided on the press brake 7, determining the area of ​​the workpiece through image processing, and multiplying this area by the plate thickness and specific gravity.

[0040] In step S113, the control unit 5 calculates a mass deceleration parameter f(M) for decelerating the bending speed if the mass M of the workpiece is equal to or greater than a predetermined value in step S111.

[0041] When the mass M of the workpiece is less than 25 kg, for example, the reference bending speed F ０ However, when the bending load exceeds 25 kg, the standard bending speed F ０ The burden on the worker is large at the standard bending speed F ０ The verification results showed that more people perceive it as faster.

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

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

[0044] In step S115, the control unit 5 acquires the workpiece width W and the bend length B, which is the length of the bend line of the workpiece, from the processing conditions 11, and determines whether the bend line ratio B / W, which is the ratio of the bend length B to the workpiece width W, is less than a predetermined value. If the bend line ratio B / W is less than the predetermined value, the process proceeds to step S117, and if it is equal to or greater than the predetermined value, the process proceeds to step S119.

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

[0046] When the bending length B becomes smaller than the workpiece width W, the reference bending speed F ０Therefore, as a result of verification, it was found that when the bending length B is less than 0.3 times the workpiece length W, the bending speed must be slowed down.

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

[0048] 9 and equation (9), the width deceleration parameter f(B) is equal to 1 when the bending line ratio B / W is 0.3 or more, and when the bending line ratio B / W is less than 0.3, f(B) decreases as the bending line ratio B / W decreases. Therefore, when the bending line ratio B / W is less than 0.3, the calculated bending speed decreases as the bending line ratio B / W decreases.

[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): F=F [Equation 10] ０ ×f(M)×f(B) (10)

[0050] That is, the bending speed F is the reference bending speed F ０ The bending speed F can be calculated by multiplying the mass deceleration parameter f(M) and the width deceleration parameter f(B). Therefore, if 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 is calculated by multiplying the mass deceleration parameter f(M) and the width deceleration parameter f(B) by "1". ０ That is, the control unit 5 determines the optimum jump-up speed U ０ and the speed conversion parameter f(L), the bending speed F is calculated.

[0051] Also, when the mass deceleration parameter f(M) is calculated in step S113, the bending speed F is set to the reference bending speed F ０ The optimum jump-up speed U ０The bending speed F is calculated based on 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 set to the reference bending speed F ０ and the width deceleration parameter f(B). ０ The bending speed F is calculated based on the speed conversion parameter f(L) and the width deceleration parameter f(B).

[0053] In addition, 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 set to the reference bending speed F. ０ is calculated by multiplying the mass deceleration parameter f(M) and the width deceleration parameter f(B). ０ The bending speed F is calculated based on 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 a 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 the bending speed F 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, in the press brake control device 1, values ​​F1 to F9 may be set as default F values, and these F values ​​may be used to set the bending speed of the press brake 7. For example, the closest F value among F values ​​smaller than the bending speed F calculated in step S119 may be set to the press brake 7.

[0056] Furthermore, when setting the bending speed, data on previously set bending speeds is recorded in the processing program, so the control unit 5 outputs an alarm to the operator if the previously set bending speed 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 issued at the same time. Once the bending speed is set in the press brake 7 in this manner, the bending speed calculation process according to this embodiment ends.

[0057] [Effects of the embodiment] As described above in detail, in the press brake control device 1 according to this embodiment, the control unit 5 acquires the thickness t of the workpiece from the processing conditions 11, and determines the optimum jump-up speed U that allows the operator to work comfortably based on the thickness t of the workpiece. ０ Then, the control unit 5 calculates a speed conversion parameter f(L) for converting the jump-up speed into a bending speed based on the processing conditions 11, and sets an appropriate jump-up speed value U ０ The bending speed F is calculated based on the speed conversion parameter f(L). ０ is set based on the workpiece thickness t, and the optimum jumping speed U ０ 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 workpiece size is large, the jump speed may be too fast, making it difficult for the worker to work comfortably. Furthermore, when the bending speed is fast, the thinner the plate, the more likely it is that a processing defect called "hip buckling" will occur, in which the part close to the bending line is distorted. On the other hand, if the bending speed is too slow, the worker must support the workpiece for a long time until bending is complete, which increases the takt time and leads to reduced productivity. However, the press brake control device 1 according to this embodiment can calculate an appropriate bending speed according to the workpiece, allowing the worker to work comfortably and preventing processing defects and reduced productivity.

[0059] In the press brake control device 1 according to this embodiment, the control unit 5 acquires the mass M of the workpiece from the processing conditions 11, and calculates a mass deceleration parameter f(M) for decelerating the bending speed when the mass M of the workpiece is equal to or greater than a predetermined value. ０ The bending speed F is calculated based on the speed conversion parameter f(L) and the mass deceleration parameter f(M). This makes it possible to calculate an appropriate bending speed for the workpiece even when the workpiece mass is large, allowing the worker to work comfortably and preventing the occurrence of processing defects and a decrease in productivity.

[0060] Furthermore, in the press brake control device 1 according to this embodiment, the control unit 5 acquires the workpiece width W and bending length B from the processing conditions 11, and calculates a width deceleration parameter f(B) for decelerating the bending speed when the ratio of the bending length B to the workpiece width W is less than a predetermined value. ０ The bending speed F is calculated based on the speed conversion parameter f(L) and the width deceleration parameter f(B). As a result, even if the bending length B becomes smaller than the workpiece width W, an appropriate bending speed can be calculated according to the workpiece, allowing the worker to work comfortably and preventing the occurrence of processing defects and a decrease in productivity.

[0061] In addition, in the press brake control device 1 according to this embodiment, the memory unit 3 stores a plurality of appropriate jump-up speed values ​​U set according to the plate thickness t of the workpiece. ０ The control unit 5 stores a plurality of optimum jump-up speed values ​​U based on the plate thickness t of the workpiece. ０ In this way, by simply selecting from the storage unit 3, an appropriate jump-up speed appropriate value U ０ can be set.

[0062] Furthermore, in the press brake control device 1 according to this embodiment, the control unit 5 acquires the die groove width V and the workpiece length L from the processing conditions 11, and calculates the speed conversion parameter f(L) based on the die groove width V and the workpiece length L. This makes it possible to appropriately convert the jump speed into a bending speed according to the workpiece length L.

[0063] Furthermore, in the press brake control device 1 according to this embodiment, 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 die groove width V and the correction value LA. This makes it possible to calculate an appropriate speed conversion parameter f(L) even when the workpiece length L is longer and the worker begins to grip the side of the workpiece.

[0064] Furthermore, in the press brake control device 1 according to this embodiment, the memory unit 3 stores a processing program 13 that records the process of bending a workpiece with the press brake 7, and data on bending speeds that have been previously set is recorded in the processing program 13. The control unit 5 outputs an alarm to the worker if the bending speed that was previously set is faster than the calculated bending speed F. This makes it possible to alert the worker even if a high bending speed was previously set for reasons such as work efficiency.

[0065] Although the embodiments of the present disclosure have been described above, the descriptions and drawings that form part of this disclosure should not be understood to limit this disclosure. Various alternative embodiments, examples, and operating techniques will become apparent to those skilled in the art from this disclosure.

[0066] The disclosure of this application is related to the subject matter described in Japanese Patent Application No. 2024-043413, filed on March 19, 2024, the entire disclosure of which is incorporated herein by reference.

Claims

1. A press brake control device comprising: a memory 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, wherein the control unit obtains the thickness of the workpiece from the processing conditions, and based on the thickness of the workpiece, sets an optimum bounce speed value for a bounce speed of a gripping portion that grips the workpiece, at which the worker can work comfortably, calculates a speed conversion parameter that converts the bounce speed into the bending speed based on the processing conditions, and calculates the bending speed based on the optimum bounce speed value and the speed conversion parameter.

2. The press brake control device according to claim 1, wherein the control unit obtains the mass of the workpiece from the processing conditions, calculates a mass deceleration parameter for decelerating the bending speed when the mass of the workpiece is equal to or greater than a predetermined value, and calculates the bending speed based on the optimum bounce speed value, the speed conversion parameter, and the mass deceleration parameter.

3. The press brake control device according to claim 1 or 2, wherein the control unit obtains the work width of the work and the bending length, which is the length of the bending line of the work, from the processing conditions, and calculates a width deceleration parameter for decelerating the bending speed when the ratio of the bending length to the work width is less than a predetermined value, and calculates the bending speed based on the optimum jump-up speed value, the speed conversion parameter, and the width deceleration parameter.

4. A press brake control device as described in claim 1, wherein the memory unit stores a plurality of optimum bounce-up speed values ​​set according to the thickness of the workpiece, and the control unit selects and sets one of the plurality of optimum bounce-up speed values ​​based on the thickness of the workpiece.

5. The press brake control device according to claim 1, wherein the control unit acquires the groove width of the die used in the press brake and the work length, which is the length from the 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.

6. The press brake control device according to claim 5, wherein 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 die groove width and the correction value.

7. A press brake control device as described in claim 1, wherein the memory unit stores a processing program that records the process of performing bending processing on the workpiece using the press brake, the processing program records data on the bending speed that was previously set, and the control unit outputs an alarm to the operator if the bending speed that was previously set is faster than the calculated bending speed.

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, the bending speed calculation method comprising: obtaining a thickness of the workpiece from the processing conditions; setting, based on the thickness of the workpiece, an optimum bounce speed value at which an operator can work comfortably among the bounce speeds of a gripping portion that grips the workpiece; calculating, based on the processing conditions, a speed conversion parameter that converts the bounce speed into the bending speed; and calculating the bending speed based on the optimum bounce speed value and the speed conversion parameter.

Images