Development drawing correction method

Abstract

To provide a development correction method capable of correcting a development for V bending to a development for L bending. [Solution] The one-sided elongation value of the V-bend of two flanges formed when workpiece 1 is V-bent at a first bend line BL using a press brake, and the one-sided elongation value of the L-bend of two flanges formed when workpiece 1 is L-bended at the first bend line BL using a panel bender are calculated in advance. A computer offsets the position of the first bend line BL in a first developed drawing used to bend workpiece 1 at the first bend line BL using a press brake by a distance based on the difference between the one-sided elongation value of the V-bend and the one-sided elongation value of the L-bend, and sets this position as a second bend line BL'. The computer corrects the first developed drawing to a second developed drawing used to bend workpiece 1 at the second bend line BL' using a panel bender by replacing the first bend line BL in the first developed drawing with the second bend line BL'.

Description

[Technical Field]

[0001] The present invention relates to a development correction method. [Background technology]

[0002] When bending a plate-shaped workpiece, a press brake such as that described in Patent Document 1 may be used, or a panel bender such as that described in Patent Document 2 may be used. Bending in which the workpiece is sandwiched between a punch and a die in a press brake and bent is called V-bending, while bending in which the workpiece is clamped by a plate holder in a panel bender and bent with a bend beam is called L-bending. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2024-61620 [Patent Document 2] Japanese Patent Application Publication No. 2019-118913 Summary of the Invention [Problem to be solved by the invention]

[0004] When bending a workpiece using a press brake, a development drawing for a V-bend must be prepared, and when bending the workpiece using a panel bender, a development drawing for an L-bend must be prepared. Preparing two different types of development drawings like this is cumbersome. If it were possible to correct one development drawing to the other, it would be sufficient to prepare one type of development drawing, eliminating the hassle of preparing two types of development drawings. There is a need for a development drawing correction method that can correct a V-bend development drawing to an L-bend development drawing, or an L-bend development drawing to a V-bend development drawing. [Means for solving the problem]

[0005] One aspect of one or more embodiments provides a development view correction method in which a V-bend elongation value of two flanges formed when a plate-shaped workpiece is V-bent at a first bend line by a press brake to a predetermined angle, and an L-bend elongation value of two flanges formed when the workpiece is L-bended at the first bend line by a panel bender to the predetermined angle are determined in advance, and a computer corrects the first development view to a second development view to be used to bend the workpiece at the second bend line by the other of the press brake and the panel bender by replacing the first bend line in the first development view with the second bend line, the second bend line being offset by a distance based on the difference between the V-bend elongation value and the L-bend elongation value. [Effects of the Invention]

[0006] According to one or more embodiments of the development correction method, a development for a V bend can be corrected to a development for an L bend, or an L bend development can be corrected to a development for a V bend. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view showing a plate-shaped workpiece to be bent by a press brake or a panel bender. [Figure 2] FIG. 2 is a diagram showing a state in which the workpiece shown in FIG. 1 has been bent by a press brake. [Figure 3] FIG. 3 is a side view showing a product shape obtained by the bending process shown in FIG. [Figure 4] FIG. 4 is a development view of a V-bend for obtaining the product shape shown in FIG. [Figure 5] FIG. 5 is a side view showing the workpiece shown in FIG. 1 in a state before being bent by a panel bender. [Figure 6] FIG. 6 is a side view showing a state in which the workpiece shown in FIG. 1 has been bent by a panel bender. [Figure 7] FIG. 7 is a side view showing one-sided elongation values ​​in L-bending when the workpiece shown in FIG. 1 is bent by a panel bender. [Figure 8] FIG. 8 is a development view for L-bending. [Figure 9] FIG. 9 is a side view showing a development correction method according to one or more embodiments, which corrects a development for a V bend to a development for an L bend. [Figure 10] FIG. 10 is a side view showing a development correction method according to one or more embodiments, which corrects a development for an L-bend into a development for a V-bend. [Figure 11] FIG. 11 is a flowchart showing a process of bending a workpiece by selecting a press brake or a panel bender as the machine for bending the workpiece using the development view correcting method according to one or more embodiments. [Figure 12] FIG. 12 is a diagram showing the state of a workpiece before bending, for explaining a method for calculating the one-sided elongation value in L-bending. [Figure 13] FIG. 13 is a diagram showing a state in which a workpiece is bent at 90 degrees, for explaining a method for calculating the one-sided elongation value in an L-bend. [Figure 14] FIG. 14 is a diagram showing a state in which the workpiece has been bent at an obtuse angle. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, a development view correcting method according to one or more embodiments will be described with reference to the accompanying drawings.

[0009] Assume that a plate-shaped workpiece 1 shown in FIG. 1 is bent using a press brake along a bend line BL indicated by a dashed line. The workpiece 1 is sheet metal. As shown in FIG. 2, the press brake clamps the workpiece 1 between a punch 11 and a die 12, and bends the workpiece 1 to a predetermined angle, for example, 90 degrees, by lowering the punch 11 toward the die 12. The regions formed by bending the workpiece 1, from one end of the workpiece 1 to the bend line BL and from the other end to the bend line BL, are referred to as flanges 2 and 3, respectively.

[0010] Figure 3 is a side view of workpiece 1 bent at 90 degrees. The dimension of flange 2 is X, and the dimension of flange 3 is F. If the length L1 of workpiece 1 shown in Figure 1 is (X+F), and workpiece 1 is bent using a press brake, the dimension of flange 2 will not be X, and the dimension of flange 3 will not be F. This is because flanges 2 and 3 are both slightly elongated by the bending process using the press brake. The elongation values ​​of both flanges 2 and 3 are called the one-sided elongation value, and this one-sided elongation value is d. The one-sided elongation value d is common to flanges 2 and 3. The one-sided elongation value d is the one-sided elongation value of the V-bend in flanges 2 and 3.

[0011] FIG. 4 shows a development of workpiece 1 for V-bending, taking into account the one-sided elongation value d. The development shown in FIG. 4 corresponds to a side view of workpiece 1 before bending workpiece 1 to obtain the product shape shown in FIG. 3. As shown in FIG. 4, flange 2 has a dimension Xd, and flange 3 has a dimension Fd. The one-sided elongation value d may be a measured value measured in advance, an empirical value, or a calculated value by a computer such as an NC device that controls the press brake.

[0012] Assume that the plate-shaped workpiece 1 shown in FIG. 4 is bent using a panel bender along the bend line BL indicated by the dashed line. As shown in FIG. 5, the panel bender clamps the flange 2, which has dimension Xd, with a pair of plate clamps 21 along the bend line BL, and brings the bend beam 22 into contact with, for example, the end of the flange 3, which has dimension Fd. The bend beam 22 does not have to be at the end of the flange 3. As shown in FIG. 6, the bend beam 22 is raised and moved toward the plate clamps 21 to bend the workpiece 1. When the workpiece 1 is bent in this way, the dimension X' of the flange 2' differs from the dimension X, and the dimension F' of the flange 3' differs from the dimension F. Therefore, even if the workpiece 1 is bent using the panel bender using the V-bend development of the workpiece 1 shown in FIG. 4, the product shape shown in FIG. 3 cannot be obtained.

[0013] FIG. 7 shows the one-sided elongation values ​​for L-bending of workpiece 1 using a panel bender. The one-sided elongation value for flange 2' is d1, and the one-sided elongation value for flange 3' is a negative value, d2. The one-sided elongation values ​​d1 and d2 are the one-sided elongation values ​​for L-bending of flanges 2' and 3'. A computer such as an NC device that controls the panel bender can calculate the bending radius between flanges 2' and 3' when workpiece 1 is L-bended based on conditions such as the material and thickness of workpiece 1 and the distance between plate holder 21 and bend beam 22. The computer can calculate the one-sided elongation values ​​d1 and d2 based on the bending radius. The method for calculating the one-sided elongation values ​​d1 and d2 will be described in detail later.

[0014] Fig. 8 shows a development view of the workpiece 1 for L-bending, taking into account the one-sided elongation values ​​d1 and d2. As shown in Fig. 8, the dimension of flange 2' is X-d1, and the dimension of flange 3' is F-d2.

[0015] Using Figure 9, we will explain a development correction method for correcting a development for a V-bend to a development for an L-bend. When workpiece 1 is V-bent at bend line BL, the dimension of flange 2 is Xd, and the dimension of flange 3 is Fd. Although flanges 2' and 3' are not shown in Figure 9, when workpiece 1 is L-bent, the dimension of flange 2' is X-d1, and the dimension of flange 3' is F-d2. Although d≠d1 and d≠d2, it can be seen that 2d = d1 + d2. Therefore, by offsetting the bend line BL for a V-bend by a distance (d1-d) so that flange 2 is shorter and flange 3 is longer, it is possible to create a bend line BL' for an L-bend. The distance (d1-d) is the offset amount.

[0016] One or more embodiments of a method for correcting a development for a V-bend to a development for an L-bend are as follows. The development for a V-bend shown in FIG. 4 is defined as the first development. The bend line BL for a V-bend is defined as the first bend line, and the bend line BL' for an L-bend is defined as the second bend line. Flanges 2 and 3 obtained when workpiece 1 is V-bent along the first bend line by a press brake are defined as the first and second flanges, respectively. Flanges 2' and 3' obtained when workpiece 1 is L-bent along the first bend line by a panel bender are defined as the third and fourth flanges, respectively. The third flange is the flange clamped by plate holder 21 of the panel bender, and the fourth flange is the flange bent by bend beam 22 of the panel bender.

[0017] The one-sided elongation value d is the first one-sided elongation value, and the one-sided elongation values ​​d1 and d2 are the second and third one-sided elongation values, respectively. The first one-sided elongation value common to the first and second flanges is determined in advance. The second one-sided elongation value of the third flange and the third one-sided elongation value of the fourth flange are determined in advance.

[0018] The computer determines the position of the second bend line as a position obtained by offsetting the position of the first bend line in the first developed drawing by a distance obtained by subtracting the first one-sided elongation value (d) from the second one-sided elongation value (d1) so that the third flange is shorter and the fourth flange is longer. The computer corrects the first developed drawing to a second developed drawing for an L-bend by replacing the first bend line in the first developed drawing with the second bend line.

[0019] According to the development correcting method according to one or more embodiments shown in FIG. 9, a development for V bending can be corrected to a development for L bending.

[0020] A method for correcting a development drawing for an L-bend to a development drawing for a V-bend will be described using Figure 10. When correcting a development drawing for an L-bend to a development drawing for a V-bend, the bending line BL for the L-bend can be made to be a bending line BL' for a V-bend by offsetting the bending line BL by a distance (d1-d) so that flange 2' is longer and flange 3' is shorter.

[0021] A method for correcting a development for an L-bend to a development for a V-bend according to one or more embodiments is as follows. The development for an L-bend shown in FIG. 8 is defined as the first development. The bend line BL for an L-bend is defined as the first bend line, and the bend line BL' for a V-bend is defined as the second bend line. When workpiece 1 is bent into an L-bend along the first bend line by a panel bender, flanges 2' and 3' are defined as the first and second flanges, respectively. The first flange is the flange clamped by plate clamp 21, and the second flange is the flange bent by bend beam 22. When workpiece 1 is bent into a V-bend along the first bend line by a press brake, flanges 2 and 3 are defined as the third and fourth flanges, respectively.

[0022] The one-sided elongation values ​​d1 and d2 are the first and second one-sided elongation values, respectively, and the one-sided elongation value d is the third one-sided elongation value. The first one-sided elongation value of the first flange and the second one-sided elongation value of the second flange are determined in advance. The third one-sided elongation value common to the third and fourth flanges is determined in advance.

[0023] The computer determines the position of the second bend line as a position obtained by offsetting the position of the first bend line in the first developed drawing by a distance obtained by subtracting the third one-sided elongation value (d) from the first one-sided elongation value (d1) so that the third flange is longer and the fourth flange is shorter. The computer corrects the first developed drawing to a second developed drawing for a V-bend by replacing the first bend line in the first developed drawing with the second bend line.

[0024] According to the development correcting method according to one or more embodiments shown in FIG. 10, a development for an L-bend can be corrected to a development for a V-bend.

[0025] The above-described development correction method for correcting a development for a V bend to a development for an L bend, and the development correction method for correcting a development for an L bend to a development for a V bend, can be summarized as follows: The one-sided elongation value of the V bend in the two flanges formed when workpiece 1 is V-bent at a predetermined angle at the first bend line by a press brake, and the one-sided elongation value of the L bend in the two flanges formed when workpiece 1 is L-bent at a predetermined angle at the first bend line by a panel bender are determined in advance.

[0026] The computer sets the second bend line to a position obtained by offsetting the position of the first bend line in a first development used to bend workpiece 1 to a predetermined angle at the first bend line by one of a press brake and a panel bender by a distance based on the difference between the one-sided elongation value for a V bend and the one-sided elongation value for an L bend. By replacing the first bend line in the first development with the second bend line, the computer corrects the first development to a second development used to bend the workpiece to a predetermined angle at the second bend line by the other of a press brake and a panel bender.

[0027] Using the flowchart shown in Figure 11, a process for selecting whether to bend a workpiece using a press brake or a panel bender when a development drawing for V-bending has been created will be described. In Figure 11, when the process starts, an operator or a computer determines a one-sided elongation value d for V-bending in step S1. The computer creates a development drawing for V-bending in step S2. The computer that executes the process in step S2 is preferably a computer that is equipped with and executes a CAD (Computer Aided Design) / CAM (Computer Aided Manufacturing) program.

[0028] In step S3, the operator selects a machine to bend the workpiece. If the operator selects a press brake, the operator determines that the machine to bend the workpiece will be the press brake in step S11. In step S12, the press brake bends the workpiece using a development drawing for V-bending, and the process ends.

[0029] When the operator selects a panel bender, the operator determines in step S21 that the machine that will bend the workpiece is the panel bender. The NC device of the panel bender, which is an example of a computer, calculates the one-sided elongation values ​​d1 and d2 for the L-bend in step S22, and calculates the offset amount for the bend line BL in step S23. In step S24, the NC device offsets the position of the bend line BL in the development drawing for the V-bend to correct it to an L-bend development. In step S25, the panel bender bends the workpiece using the development drawing for the L-bend, and the process ends.

[0030] In FIG. 11, if the computer creates an L-bend development drawing instead of steps S1 and S2, steps S22 to S24 can be omitted, and a step of correcting the L-bend development drawing to a V-bend development drawing can be provided between steps S11 and S12.

[0031] 12 and 13, the calculation method for the one-sided elongation values ​​d1 and d2 in L-bending will be described. As can be seen from FIGS. 7 and 8, d1 = X' - X and d2 = F' - F. When workpiece 31 shown in FIG. 12 is divided by bend line BL, the dimension of flange 32 is X and the dimension of flange 33 is F. Between flanges 32 and 33, there is an arc portion 33R that becomes the bend R when workpiece 31 is L-bent. If the bending angle of workpiece 31 is 90 degrees, the dimension of flange 32 shown in FIG. 13 is X' = X + R, and d1 = R.

[0032] If the angle of arc portion 33R indicated by the dashed line is φ [rad], the length of arc portion 33R is R×φ, and the length of flange 33 excluding arc portion 33R is FR×φ. The length of flange 33 shown in Figure 13 is FR×φ+R, and since d2 = F' - F, d2 = FR×φ+RF = R(1-φ). The one-sided elongation values ​​d1 and d2 of the L-bend in step S22 shown in Figure 11 can be calculated geometrically in this way.

[0033] 14 shows a case where the bending angle of the workpiece 31 is an obtuse angle. Even if the predetermined bending angle of the workpiece 31 is an obtuse angle, the one-sided elongation values ​​d1 and d2 of the L-bend can be calculated geometrically.

[0034] The present invention is not limited to one or more of the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. [Explanation of symbols]

[0035] 1 Work 2,2',3,3' flange 11 Punch 12 Die 21 Board holder 22 Bend beam

Claims

1. a V-bend elongation value of two flanges formed when a plate-shaped workpiece is V-bent at a predetermined angle along a first bend line by a press brake, and an L-bend elongation value of two flanges formed when the workpiece is L-bent at the predetermined angle along the first bend line by a panel bender are previously determined; The computer a position of the first bend line in a first development view used to bend the workpiece to the predetermined angle at the first bend line by one of the press brake and the panel bender, offset by a distance based on the difference between the one-sided elongation value of the V-bend and the one-sided elongation value of the L-bend, and By replacing the first bending line in the first developed drawing with the second bending line, the first developed drawing is corrected to a second developed drawing used to bend the workpiece to the predetermined angle at the second bending line by the other machine of the press brake and the panel bender. How to correct the development drawing.

2. the two flanges formed when the workpiece is V-bent at the first bend line to the predetermined angle by the press brake are called first and second flanges, and the two flanges formed when the workpiece is L-bent at the first bend line to the predetermined angle by the panel bender are called third and fourth flanges; the third flange is a flange that is clamped by a plate holder of the panel bender, and the fourth flange is a flange that is bent by a bend beam of the panel bender; the V-bend elongation value is a first elongation value common to the first and second flanges, the L-bend one-sided elongation value is a second one-sided elongation value that is a one-sided elongation value of the third flange, and a third one-sided elongation value that is a one-sided elongation value of the fourth flange, When the first development is a development used to V-bend the workpiece at the first bending line to the predetermined angle by the press brake, The computer The position of the first bend line in the first developed view is offset by a distance obtained by subtracting the first one-sided elongation value from the second one-sided elongation value so that the third flange is shorter and the fourth flange is longer, and the offset position is defined as the second bend line; By replacing the first bending line in the first developed drawing with the second bending line, the first developed drawing is corrected to the second developed drawing used for bending the workpiece at the second bending line to the predetermined angle by the panel bender. The development correction method according to claim 1 .

3. The two flanges formed when the workpiece is bent in an L-shape at the first bend line to the predetermined angle by the panel bender are called first and second flanges, and the two flanges formed when the workpiece is bent in a V-shape at the first bend line to the predetermined angle by the press brake are called third and fourth flanges, the first flange is a flange that is clamped by a plate holder of the panel bender, and the second flange is a flange that is bent by a bend beam of the panel bender; the L-bend one-sided elongation value is a first one-sided elongation value that is a one-sided elongation value of the first flange, and a second one-sided elongation value that is a one-sided elongation value of the second flange, the V-bend elongation value is a third elongation value common to the third and fourth flanges, When the first development view is a development view used for bending the workpiece into an L-shape at the first bend line by the panel bender to the predetermined angle, The computer The position of the first bending line in the first developed view is offset by a distance obtained by subtracting the third one-sided elongation value from the first one-sided elongation value so that the third flange is longer and the fourth flange is shorter, and the offset position is defined as the second bending line; By replacing the first bend line in the first development with the second bend line, the first development is corrected to the second development used to V-bend the workpiece at the second bend line by the press brake to the predetermined angle. The development correction method according to claim 1 .

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