JP4592136B2 - Plate material processing method and plate material processing system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention The board material The present invention relates to a processing method and a plate material processing system.
[0002]
[Prior art]
Conventionally, in a plate material processing system, for example, a nominal value of a workpiece such as a material SPCC and a plate thickness 1.6 is input to an automatic programming device, and an elongation value necessary at the time of bending is calculated based on this nominal value. The developed dimension of the blank material is calculated from the elongation value.
[0003]
In the blanking process before the bending process, the blank material is punched by a punching machine based on the above-described development dimension. Each blank is bent by a bending machine.
[0004]
[Problems to be solved by the invention]
By the way, in the conventional plate material processing system, when the characteristic of the workpiece to be actually processed is far from the nominal value, for example, when the nominal plate thickness is 1.6 mm, the actual plate thickness is 1.5 mm. However, with the elongation value resulting from this difference in plate thickness, it is not possible to obtain the correct unfolded length of the blank with an automatic programming device, so there is a problem that the actual bending dimensions after bending are not within the allowable range. .
[0005]
In bending machines, the thickness of the workpiece is measured by the plate thickness detection function when the workpiece is bent, and this measured thickness is applied to the determination of the D value (ram stroke amount) for calculating the bending angle. Some have. However, this merely uses the thickness information actually measured in the bending machine alone. For example, even if the thickness of the blank material is measured by the thickness detection function at the time of bending, the blank material that has already been punched has a problem in that the development dimension cannot be corrected. Alternatively, there is a problem that it takes time for reworking to correct the blank material.
[0006]
In addition, since the thickness of the workpiece varies depending on the location in the sheet, a difference occurs in the thickness of each blank material. As described above, there is a problem that the bending dimension does not fall within the allowable range. It was.
[0007]
Also, the bending angle should be calculated from the actual plate thickness and material constant rather than the springback amount and stroke amount from the nominal plate thickness and material constants (tensile strength, Young's modulus, n value, f value, etc.). Although it is known that the bending angle is close to the actual one, it cannot be reflected in the developed dimension unless the actual plate thickness and material constant of the workpiece are known before bending. Even if the material constant is obtained from the load / stroke information at the time of the first bending, this information is reflected from the next bending.
[0008]
The present invention has been made to solve the above-mentioned problems, and its purpose is to measure the actual plate thickness and material constant at the time of punching before bending, and efficiently reflect this measurement information in bending. Can be accurately bent Board The object is to provide a material processing method and a plate material processing system.
[0011]
[ Means for solving the problem ]
Claim 1 According to the present invention, the blank material processing method according to the present invention performs the blanking process for each blank material based on the nominal thickness and nominal material constant of the workpiece in the blanking process before bending the workpiece, and detects the ram detected at the time of punching. Calculate the actual plate thickness distribution and material constant distribution of the workpiece based on the stroke and pressure data, and determine the actual plate thickness and material constant of each blank from the plate thickness distribution and material constant distribution. To bend each blank material based on the actual thickness and material constant Around The bending of each blank was calculated based on the actual thickness and material constant of each blank, and the elongation value of each blank was calculated from the elongation value, the nominal thickness of the workpiece, and the nominal material constant. Judge whether the difference from the elongation value is within the allowable value, and blank materials that are within the allowable value average Bending is performed based on the plate thickness and material constant, and the blank material outside the allowable value should be bent based on the actual plate thickness and material constant preferentially for the critical dimension part, or bend processing should be stopped. It is characterized by.
[0014]
Therefore, since the elongation error of each blank material is known in advance, since the bending process is performed according to whether or not this elongation error is within the allowable value, the product accuracy is improved, the work efficiency at the time of bending process is improved, Inspection time after bending is shortened.
[0015]
Claim 2 The plate material processing method of the present invention according to the present invention performs a test punching in the gap between each blank material developed based on the nominal plate thickness of the workpiece and the nominal material constant in the blanking process before bending the workpiece. The actual plate thickness distribution and material constant distribution of the workpiece are calculated based on the detected ram stroke and pressure data, and the actual plate thickness and material constant of each blank are calculated based on the plate thickness distribution and material constant distribution. Each blank is developed and blanked based on the actual plate thickness and material constant, and each blank is bent based on the actual plate thickness and material constant. It is.
[0016]
Therefore, the actual plate thickness distribution and material constant distribution of the workpiece are measured at the time of trial punching before bending, so the actual plate thickness and material constant of each blank material are determined, and this measurement information is accurate for each blank. Reflected in material development and blanking. In addition, since the measurement information is reflected in the bending process, the bending process is performed efficiently and accurately. Further, for example, a mass of a blank material having a small bending error simplifies the inspection time, so that the inspection time after bending is shortened.
[0017]
Claim 3 The plate material processing method of this invention by Said In the plate material processing method, the blanking processing of each blank material described above calculates the elongation value of each blank material based on the actual plate thickness and material constant of each blank material, Judge whether or not the difference from the average elongation value obtained from the blank material having the average plate thickness and material constant is within the allowable value, and the blank material within the allowable value is developed based on the average plate thickness and material constant. Blanking is performed, and blank material outside the allowable value is developed based on actual plate thickness and material constant, and blanking is performed or blanking is stopped.
[0018]
Therefore, since the elongation error of each blank material is known in advance, blanking and bending are performed in accordance with whether or not this elongation error is within an allowable value, thereby improving product accuracy and working during bending. Increases efficiency and shortens inspection time after bending.
[0019]
Claim 4 The plate material processing method of this invention by Said In the plate material processing method, the bending of each blank material described above is based on the actual plate thickness and material constant based on the actual plate thickness and material constant when bending the blank material having the average plate thickness and material constant of each blank material to a predetermined angle. And calculate whether the angle when the other blank is bent with the same stroke amount is within the allowable value for the specified angle, and the blank material within the allowable value is bent with the same stroke amount. The blank material outside the value is characterized in that the bending process is performed with the stroke amount calculated based on the individual plate thickness and material constant, or the bending process is stopped.
[0020]
Therefore, since the bending error in the stroke amount control of each blank material is known in advance, blanking processing and bending processing are performed in accordance with whether or not this bending error is within an allowable value, thereby improving product accuracy. This improves work efficiency during bending and shortens inspection time after bending.
[0021]
Claim 5 The plate material processing method of this invention by Said In the plate material processing method, the bending of each blank material described above calculates the sandwiching angle by calculating the springback amount of the blank material having the average plate thickness and material constant of each blank material, and the other blank materials are the same Judge whether the finished angle after bending up to the sandwiching angle is within the allowable value, blank materials within the allowable value are bent at the same sandwiching angle, blank materials outside the allowable value are individual plate thickness, The amount of springback is calculated based on the material constant, the sandwiching angle is calculated, and bending is performed at this sandwiching angle.
[0022]
Therefore, since the bending error in the sandwiching angle control of each blank material is known in advance, blanking processing and bending processing are performed according to whether or not this bending error is within an allowable value, thereby improving product accuracy. This improves work efficiency during bending and shortens inspection time after bending.
[0023]
Claim 6 The plate material processing system according to the present invention includes an automatic programming device that develops a blank material based on a workpiece thickness and material constant, a punching machine that punches and blanks a workpiece by cooperation of a punch and a die, The actual plate thickness distribution and material constant distribution of the workpiece are calculated based on the ram stroke and pressure data detected at the time of punching the workpiece with a punching machine, and each calculated from the calculated plate thickness distribution and material constant distribution A control device equipped with a plate thickness / material constant calculation device that determines the actual plate thickness and material constant of the blank material, and bending that performs bending of each blank material based on the actual plate thickness and material constant of each blank material With processing machine With The control device determines that the difference between the elongation value of each blank material calculated based on the actual plate thickness and material constant of each blank material and the elongation value obtained from the nominal plate thickness of the workpiece and the nominal material constant is within an allowable value. It is characterized by comprising an elongation error judging means for judging whether or not.
[0026]
Therefore , Therefore, since the bending error of each blank material is known, bending is performed according to whether or not this elongation error is within an allowable value, so that product accuracy is improved, work efficiency is improved during bending, and bending is performed. Later inspection time will be shortened.
[0027]
Claim 7 The plate material processing system of this invention by Said In the plate material processing system, the control device includes a blank material having an elongation value of each blank material calculated based on an actual plate thickness and material constant of each blank material, and an average plate thickness and material constant of each blank material. It is characterized by comprising an elongation error judging means for judging whether or not the difference from the average elongation value obtained from the above is within an allowable value.
[0028]
Therefore , Therefore, the blanking and bending processes are performed according to whether or not the elongation error is within an allowable value, so that the accuracy of the product is improved and the work efficiency during bending is improved. Improvement and shortening of inspection time after bending.
[0029]
Claim 8 The plate material processing system of this invention by Said In the plate material processing system, the control device calculates the stroke amount when bending the blank material having the average plate thickness and material constant of each blank material to a predetermined angle based on the actual plate thickness and material constant, It is characterized by comprising a stroke control bending error judging means for judging whether or not an angle when bending another blank material with the same stroke amount is within an allowable value with respect to a predetermined angle.
[0030]
Therefore , Therefore, since the bending error in controlling the stroke amount of each blank material is known, blanking and bending are performed in accordance with whether or not the bending error is within an allowable value, which improves product accuracy and bending. This will improve the working efficiency and shorten the inspection time after bending.
[0031]
Claim 9 The plate material processing system of this invention by Said In the plate material processing system, the control device calculates the sandwich angle by calculating the springback amount of the blank material having the average plate thickness and material constant of each blank material, and bends the other blank materials to the same sandwich angle. And a pinching angle control bending error determination means for determining whether or not the subsequent finished angle is within an allowable value.
[0032]
Therefore , For this reason, the bending error in controlling the sandwiching angle of each blank material can be understood, so blanking and bending are performed in accordance with whether or not the bending error is within an allowable value, so that product accuracy is improved and bending is performed. This will improve the working efficiency and shorten the inspection time after bending.
[0033]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a plate material processing method and a plate material processing system of the present invention will be described with reference to the drawings.
[0034]
Referring to FIG. 1, the plate material processing system according to the present embodiment is an automatic programming that develops a blank material based on the plate thickness and material constant of workpiece W (tensile strength, Young's modulus, n value, f value, etc.). For example, a turret punch press 3 as a punching machine for punching and blanking a workpiece W in cooperation with the apparatus 1 and the punch P and the die D, and bending of each blank material punched by the turret punch press 3 For example, a press brake 5 is used as a bending machine for performing processing.
[0035]
More specifically, for example, the turret punch press 3 as the punching machine described above has a frame structure in which both sides of the upper frame 13 are supported by side frames 9 and 11 erected on both sides of the base 7. . A disk-shaped upper turret 15 provided with various types of punches P is detachably mounted on the lower portion of the upper frame 13. A lower turret 17 facing the upper turret 15 is rotatably mounted on the upper surface of the base 7, and a large number of dies D facing various types of punches P are arranged in an arc shape on the lower turret 17. And it is detachably mounted. The upper turret 15 and the lower turret 17 are rotated synchronously in the same direction under the control of the control device 19.
[0036]
The positions of the die D and the punch P mounted on the right side portion of the upper turret 15 and the lower turret 17 in FIG. 1 are the processing positions, and the striker 21 is placed on the upper frame 13 above the punch P at the processing position. It can be moved up and down. The striker 21 is connected to a piston rod 27 of a piston 25 that moves up and down in a hydraulic cylinder 23 as a driving device provided in the upper frame 13 via, for example, a ram 29 (pressure member).
[0037]
Further, the turret punch press 3 is provided with a workpiece movement positioning device 31 for moving the workpiece W in the front-rear and left-right directions and positioning the workpiece W at the machining position so as to be controlled by the control device 19. The workpiece movement positioning device 31 is provided with a carriage base 33 which can move in the left and right Y-axis directions in FIG. 1 on the base 7. The carriage base 33 is substantially horizontal and orthogonal to the Y-axis direction. A carriage 35 that is movable in the X-axis direction is provided. The carriage 35 is provided with a plurality of work clamps 37 that clamp the work W at appropriate intervals in the X-axis direction.
[0038]
Therefore, the workpiece W positioned at the machining position is punched by the cooperation of the punch P and the die D when the punch P is struck by the ram 29.
[0039]
Further, as shown in FIG. 2, the control device 19 of the turret punch press 3 has an actual plate thickness distribution of the workpiece W based on ram stroke and pressure data detected when the workpiece W is punched. For example, a plate thickness / material constant detecting unit 39 as a plate thickness / material constant computing device that calculates a material constant distribution and determines the actual plate thickness and material constant of each blank from the calculated plate thickness distribution and material constant distribution. Is provided.
[0040]
Referring to FIG. 2, an encoder 41 is provided below the hydraulic cylinder 23, and a pulse signal proportional to the moving speed is output from the encoder 41 as the ram 29 moves up and down. This pulse signal is input to the position detector 43, and the position detector 43 detects the lower end position of the punch P, that is, the stroke amount of the ram 29. This stroke amount is configured to be transmitted to a plate thickness / material constant detection unit 39 for detecting the plate thickness and material constant of the workpiece W.
[0041]
A servo valve 53 is connected to the pressurizing chamber 45 of the hydraulic cylinder 23 via the pressurizing side hydraulic conduit 47 and the back pressure chamber 49 via the back pressure side hydraulic conduit 51, and a command is issued from the main control unit 55. The pressure oil of the hydraulic pump 57 is supplied to the pressurizing chamber 45 or the back pressure chamber 49 of the hydraulic cylinder 23 by the switching operation of the servo valve 53, so that the ram 29 is driven up and down at a predetermined speed. It is configured.
[0042]
Further, a pressure sensor 59 for detecting a pressing force at the time of punching is connected to the pressurizing-side hydraulic pipe 47, and the pressing force detected by the pressure sensor 59 is transmitted to the above-described plate thickness / material constant detecting unit 39. It is configured to be.
[0043]
With the above configuration, the plate thickness / material constant detection unit 39 is shown in FIG. 3 from the stroke amount sent from the position detection unit 43 and the punching load sent from the pressure sensor 59 when the workpiece W is punched. As shown, a stroke / load diagram is required.
[0044]
From this stroke / load diagram, the load suddenly rises at the position of point A where the punch P contacts the workpiece W, and the actual plate thickness is detected from the detection of the position of this point A.
[0045]
Moreover, a material constant is calculated | required from said stroke and load diagram. For example, the tensile strength (tensile strength) is obtained from the magnitude of the maximum punching load Cmax. Alternatively, the Young's modulus E is obtained from the slope of the elastic deformation region B, and the yield stress σ, N value, F value, maximum tensile stress value, and the like are obtained from the plastic deformation region C.
[0046]
More specifically, the material constants for punching cannot be used directly in the calculation during bending, but the same shape stroke / load diagram is obtained for punching and tensioning for the same material. Therefore, the material constant obtained from the stroke / load diagram by punching can be converted to the material constant by tension.
[0047]
For example, the material constant obtained from the stroke / load diagram obtained in the tensile test of the reference material is the Young's modulus E _0T , Poisson's ratio ν _0T Yield stress σ _0T , N value n _0T , F value f _0T And The material constant in this tension is stored in advance in the memory 61 of the control device 19 of the turret punch press 3.
[0048]
The material constant obtained from the stroke / load diagram obtained by punching the reference material with a reference die for detecting the material constant as described above is the Young's modulus E _0P , Poisson's ratio ν _0P Yield stress σ _0P , N value n _0P , F value f _0P And The material constant for this punching is also stored in advance in the memory 61 of the control device 19 of the turret punch press 3.
[0049]
The material constant obtained from the stroke / load diagram obtained as described above by punching the workpiece W actually used with a reference die for detecting the material constant is the Young's modulus E _1P , Poisson's ratio ν _1P Yield stress σ _1P , N value n _1P , F value f _1P Then, the material constant in tension of the workpiece W actually used is Young's modulus E _1T [= (E _1P / E _0P ) E _0T ], Poisson's ratio ν _1T [= (Ν _1P / Ν _0P ) Ν _0T ], Yield stress σ _1T [= (Σ _1P / Σ _0P ) Σ _0T ], N value n _1T [= (N _1P / N _0P ) N _0T ] F value f _1T [= (F _1P / F _0P ) F _0T ].
[0050]
Referring again to FIG. 2, the control device 19 of the turret punch press 3 includes data from the automatic programming device 1, a stroke / load diagram obtained by the plate thickness / material constant detection unit 39, or a plate thickness distribution. A memory 61 for storing data such as a material constant distribution is provided.
[0051]
Further, the control device 19 includes the actual plate thickness of each blank material determined by the plate thickness / material constant detection unit 39, the elongation value of each blank material calculated based on the material constant, the nominal plate thickness of the workpiece W, For example, an elongation error determination unit 63 is provided as elongation error determination means for determining whether or not the difference from the elongation value obtained from the nominal material constant is within an allowable value.
[0052]
In this elongation error determination unit 63, the actual plate thickness of each blank material determined by the plate thickness / material constant detection unit 39, the elongation value of each blank material calculated based on the material constant, and the average of each blank material It can also be determined whether or not the difference from the average elongation value obtained from the blank material having the plate thickness and material constant is within the allowable value.
[0053]
Further, the control device 19 calculates the stroke amount when bending the blank material having the average plate thickness and material constant of each blank material to a predetermined angle based on the actual plate thickness and material constant, and this same stroke. For example, a D-value bending error determination unit 65 is provided as stroke control bending error determination means for determining whether or not an angle when bending another blank material by an amount is within an allowable value with respect to a predetermined angle.
[0054]
Further, the control device 19 calculates the sandwiching angle by obtaining the spring back amount of the blank member having the average plate thickness and material constant among the blank members, and after bending the other blank members to the same sandwiching angle. For example, a sandwiching angle bending error determination unit 67 is provided as sandwiching angle control bending error determination means for determining whether the finished angle is within an allowable value.
[0055]
Referring to FIG. 1 again, for example, a press brake 5 as a bending machine includes C-shaped frames 69L and 69R which are erected, and can be moved up and down on the lower front surface of the C-shaped frames 69L and 69R. A lower table 71 is provided. A die D is detachably mounted on the lower table 71. On the other hand, an upper table 73 is fixedly provided on the upper front surface of the C-shaped frame 69, and a punch P is detachably attached to the lower portion of the upper table 73.
[0056]
Main cylinders 75L and 75R are provided at the lower part of the C-shaped frame 69, and the tips (upper ends) of the piston rods 77L and 77R attached to the main cylinders 75L and 75R are attached to the lower table 71. ing. The lower table 71 incorporates crowning sub-cylinders 79L and 79R, and is attached to the upper portion of the lower table 71 via piston rods 81L and 81R.
[0057]
Pressure reducing valves 83L and 83R are connected to the main cylinder 75L and the sub cylinder 79L, and the main cylinder 75R and the sub cylinder 79R, and pressure sensors 85L and 85R are connected to the main cylinders 75L and 75R. Position scales 87L and 87R are provided on both side surfaces of the upper table 73, and position sensors 91L and 91R are provided on both side surfaces of the lower table 71 via brackets 89L and 89R.
[0058]
Further, a guide rail 93 is laid on the upper front surface of the lower table 71, and a bending angle measuring device 95 for detecting a bending angle when the workpiece W is bent is provided on the guide rail 93. It is provided to be movable in the direction.
[0059]
The bending angle measuring device 95, pressure sensors 85L and 85R, and position sensors 91L and 91R are connected to the control device 97, respectively.
[0060]
Referring to FIG. 4, a slider 99 is provided on the guide rail 93 so as to be movable and positionable in a direction orthogonal to the paper surface in FIG. A bracket 101 is attached to the slider 99 with a plurality of bolts, and a guide rail 103 is provided on the bracket 101 in the front-rear direction (left-right direction in FIG. 4). A slider 105 that is movable in the front-rear direction along the guide rail 103 is provided. On the slider 105, a measurement indicator 107 is provided.
[0061]
This measurement indicator 107 has a detection head 109, and this detection head 109 is supported so as to rotate integrally with a gear 111 having a rotation center P0 at the center of the front surface of the detection head 109. A worm gear 113 that meshes with the gear 111 is rotatably provided. The worm gear 113 is rotationally driven by a motor 115.
[0062]
Therefore, when the motor 115 rotates the worm gear 113, the gear 111 meshing with the worm gear 113 is rotationally driven, so that the detection head 109 is vertically moved by a desired angle centered on the front center (the vertical direction in FIG. 4). ).
[0063]
Referring to FIG. 5, the detection head 109 has a laser projector 117, which is a light emitting element, at the center, and a first light receiver 119A and a second light receiver 119B made of, for example, photodiodes above and below the laser projector 117. have.
[0064]
Referring to FIG. 5, the case where the detection head 109 is used to detect the bending angle 2 · θ of the workpiece W will be described. The laser beam LB emitted from the laser projector 117 of the swinging detection head 109 is expressed as follows. The light is reflected by the surface of W, received by the first light receiver 119A and the second light receiver 119B, converted into a signal, and transmitted to the control device 97. That is, the control device 97 determines that the angle of the detection head 109 is θ ₁ It is detected that the laser light LB emitted from the laser projector 117 is reflected by the workpiece W and the amount of reflected light received by the first light receiver 119A is maximized.
[0065]
For example, the change in the amount of reflected light received with respect to the rotation angle of the detection head 109 is generally determined when the rotation angle of the detection head is the reference angle θ (θ = 0 degrees in the example shown in FIG. 5). ) In the counterclockwise direction ₁ The amount of light received by the first light receiver 119A is maximized when rotated by a degree, and the rotation angle of the detection head 109 is θ clockwise relative to the reference angle θ. ₂ The amount of light received by the second light receiver 119B is maximized when rotated by a degree.
[0066]
Since the first light receiver 119A and the second light receiver 119B are provided at an equal distance from the laser projector 117, the angle of the detection head 109 when the amount of light received by the first light receiver 119A is maximized, and the second light receiver It can be seen that the laser beam LB from the laser projector 117 is projected perpendicularly to the bent workpiece W at an intermediate position with respect to the angle of the detection head 109 when the amount of light received by the device 119B is maximized. Accordingly, the angle 2θ of the bent workpiece W is 2 · θ = θ ₁ + Θ ₂ More obtained.
[0067]
Referring to FIG. 6, the control device 97 of the press brake 5 includes a CPU 121, and an input device 123 such as a keyboard is connected to the CPU 121 for inputting various data. Is connected to a display device 125 such as a CRT. The CPU 121 is connected to main cylinders 75L and 75R, pressure sensors 59L and 59R, position sensors 91L and 91R, and a measurement indicator 107.
[0068]
The CPU 121 receives the punch tip radius PR, the punch tip angle PA, the punch tip slope length PL, the punch deflection constant PT, the die shoulder radius DR, the die groove angle DA, and the die V width V from the input device 123 as die conditions. A memory 127 to which data such as material, plate thickness T, bending length B, friction coefficient, etc. are inputted and stored is connected.
[0069]
The memory 127 stores the actual plate thickness and material constant of each blank material calculated by the plate thickness / material constant detection unit 39 of the control device 19 of the turret punch press 3 described above, the elongation error determination unit 63, and D. As the results determined by the value bending error determination unit 65 and the sandwiching angle bending error determination unit 67 and the data obtained when determined by the determination units 63, 65, 67, for example, the actual plate thickness of each blank material, The elongation value, stroke amount, spring back amount, sandwiching angle, etc. of each blank material calculated based on the material constants are transmitted from the control device 19 of the turret punch press 3 and are taken in and stored. .
[0070]
The CPU 121 is connected to an arithmetic device 129 that calculates appropriate bending conditions for each blank material based on the data transmitted from the control device 19 of the turret punch press 3. Appropriate bending conditions for each blank material calculated and when the bending process is performed with the press brake 5 at an arbitrary pinching angle, the pressure sensors 59L and 59R, position sensors 91L and 91R, and the measurement indicator 107 detect each of the blank materials. A comparison / determination device 131 is connected to give a command to perform an appropriate bending process by comparing the actual bending load, stroke amount, and sandwiching angle.
[0071]
In this embodiment, the elongation error determination unit 63, the D value bending error determination unit 65, and the sandwiching angle bending error determination unit 67 are provided in the control device 19 of the turret punch press 3, but the control device of the press brake 5 97 may be provided.
[0072]
Next, the board | plate material processing method using the board | plate material processing system of the said structure is demonstrated as 1st Embodiment.
[0073]
Referring to FIG. 7, in the automatic programming apparatus 1, data on the nominal plate thickness and nominal material constant (tensile strength, Young's modulus, n value, f value, etc.) of the workpiece W is input.
[0074]
Based on the nominal plate thickness and the nominal material constant, the elongation value of the blank is calculated and the unfolded dimension is calculated. As shown in FIG. 8, the blank of the blank material is determined for the workpiece W (steps S1 and S2).
[0075]
The machining program including the development data of each blank material in the workpiece W is sent to the control device 97 of the turret punch press 3 as shown in FIG. In the turret punch press 3, blanking is performed by actually punching each blank material based on the above processing program.
[0076]
The plate thickness / material constant detection unit 39 of the control device 19 detects various data of the ram stroke and pressure every time each blank is punched as described above, and each punching position is based on the stroke value and the load. Since the material constants such as the plate thickness and the tensile strength are calculated, the actual plate thickness distribution and material constant distribution of the workpiece W are calculated, for example, as shown in FIG.
[0077]
Accordingly, the actual plate thickness and material constant of each blank material are determined from the above plate thickness distribution and material constant distribution. When each blank material is punched, a blank identification symbol, plate thickness, tensile strength, etc. may be marked at the same time. For example, each blank has a thickness t = 0.8 mm and a tensile strength of 2.94 x 10 ⁸ Pa (30kg / mm ² ), Identification symbols (A), (B), (C)... (Step S3).
[0078]
Moreover, the specific blank material which has average board thickness and tensile strength is extracted in each blank material. For example, of the three blanks, the blank (A) is t = 0.80 mm and the tensile strength is 2.94 × 10. ⁸ Pa (30kg / mm ² ), Blank material (B) is t = 0.81mm, tensile strength 3.04 × 10 ⁸ Pa (31kg / mm ² ), Blank material (C) is t = 0.82mm, tensile strength 3.14 × 10 ⁸ Pa (32kg / mm ² ), The blank material (B) is an average specific blank material (step S4).
[0079]
Next, the control device 19 predicts at least one of the following three bending errors based on the actual plate thickness and material constant of each blank material (step S5).
[0080]
1. The elongation error of each blank is calculated based on the nominal plate thickness and material constant.
[0081]
2. Based on the actual plate thickness and material constant of each blank material, the bending error of each blank material in D value control is calculated.
[0082]
3. Based on the actual plate thickness and material constant of each blank material, the bending error of each blank material in the sandwich angle control is calculated.
[0083]
The above-mentioned “1. Elongation error of each blank material” will be described in more detail. In the plate thickness / material constant detection unit 39 of the control device 19, based on the actual plate thickness and material constant of each blank material, An elongation value is calculated. The difference between the elongation value of each blank material and the elongation value obtained from the nominal thickness of the workpiece W and the nominal material constant is the “elongation error”.
[0084]
The elongation value is obtained from the thickness and material of the blank material [elongation value = f (thickness, material, die V width)].
[0085]
For example, as shown in FIG. 10, the blank material (A) has t = 1.16 mm and tensile strength σ. _A The elongation value is calculated to be 1.11 mm based on the above, the blank material (B) is t = 1.17 mm, the tensile strength σ _B The elongation value is calculated as 1.12 mm based on the above, the blank material (C) is t = 1.18 mm, the tensile strength σ _C Based on this, the elongation value is calculated to be 1.13 mm.
[0086]
The elongation value calculated from the nominal plate thickness and the nominal material constant by the automatic programming device 1 in step S 1 has already been input to the memory 61 of the control device 19. For example, nominal thickness t = 1.20mm, tensile strength σ ₀ When the elongation value calculated from 1 is 1.20 mm, a difference between the elongation value of 1.20 mm and the actual elongation value of each blank material is an “elongation error”.
[0087]
Accordingly, the elongation error is calculated as 0.09 mm for the blank material (A), 0.08 mm for the blank material (B), and 0.07 mm for the blank material (C).
[0088]
The above-mentioned “2. Bending error of each blank material in D value control” will be described in more detail. The plate thickness / material constant detection unit 39 of the control device 19 calculates the average plate thickness and material constant of each blank material. The D value (stroke amount) when the blank material is bent to a predetermined angle is calculated based on the actual plate thickness and material constant. The difference between the angle at which the other blank material is bent with the same stroke amount and the above-mentioned predetermined angle is the “D value control bending error”.
[0089]
For example, as shown in FIG. 11, when the blank (B) having an average plate thickness and plate constant is bent at a predetermined angle of 90 °, the D value is the actual plate thickness and material of the blank (B). Calculated as a constant. Assume that the calculated D value is 2.10.
[0090]
For the other blank materials (A) and (C), the bending angle when bending at the same D value as the calculated D value 2.10 of the above blank material (B) is the same as that of the blank materials (A) and (C). It is calculated based on each actual sheet thickness and material constant. As a result, since the bending angle of the blank material (A) is 90.5 °, the bending error is 0.5 °. Since the bending angle of the blank material (C) is 89.5 °, the bending error is 0.5 °.
[0091]
The above-mentioned “3. Bending error of each blank material in sandwiching angle control” will be described in more detail. The plate thickness / material constant detection unit 39 of the control device 19 calculates the average plate thickness and material constant of each blank material. The spring back amount of the blank material is calculated based on the actual plate thickness and material constant. A sandwiching angle for obtaining a predetermined finishing angle is calculated from the springback amount. The finished angle after other blanks are bent to the same sandwiching angle is calculated based on the actual sheet thickness and material constant. The difference between the finished angle when other blank materials are bent to the same sandwiching angle and the above-mentioned predetermined angle is the “squeezing angle control bending error”.
[0092]
For example, as shown in FIG. 12, the springback amount of the blank (B) having an average plate thickness and plate material constant is calculated to be 2.0 °, and therefore the sandwiching angle for bending to a predetermined angle of 90 ° is 88 °.
[0093]
For the other blanks (A) and (C), the finished angle when the blank material (B) is bent to the same sandwich angle as the calculated sandwich angle of 88 ° is the blank material (A) and (C). It is obtained from the springback amount calculated based on the actual plate thickness and material constant. As a result, since the spring back amount of the blank (A) is 2.5 ° and the finished angle is 90.5 °, the bending error is 0.5 °. Since the spring back amount of the blank material (C) is 1.5 ° and the finished angle is 89.5 °, the bending error is 0.5 ° (up to this point, step S5).
[0094]
Allowable values are set for the above three bending errors, that is, the elongation error of each blank material, the bending error of each blank material in D value control, and the bending error of each blank material in sandwiching angle control. (Step S6).
[0095]
As shown in FIG. 13, for example, as shown in FIG. 13, a message indicating how much the actual error with respect to the allowable value is in the above range and which blank material is within the allowable value is displayed on the display device. It is displayed (step S7).
[0096]
Referring to FIG. 7, whether or not each of the above errors is within an allowable value is determined by the following determination units of the control device 19 (step S8).
[0097]
With regard to “elongation error”, it is determined whether or not the “elongation error” of each blank material is within an allowable value by the elongation error determination unit 63.
[0098]
In the case of a blank material whose “elongation error” is outside an allowable value, the material is bent so that an important dimension portion in the blank material has a predetermined dimension. For example, in order to release an elongation error to the other flange, first, the important dimension portion is bent (step S9). Alternatively, in the case of a blank material whose “elongation error” is outside the allowable value, bending is not performed (step S10).
[0099]
For a blank material whose “elongation error” is within an allowable value, a normal bending process is performed by the press brake 5 (step S11).
[0100]
With respect to “D value controlled bending error”, it is determined by the D value bending error determining unit 65 whether or not the “D value controlled bending error” of each blank material is within an allowable value.
[0101]
If the “D-value controlled bending error” is a blank that is outside the allowable value, an alarm is displayed to the operator. In this case, the operator calculates a D value (stroke amount) with respect to a predetermined angle based on the actual plate thickness and material constant of each blank material. Therefore, since the bending process is performed by the press brake 5 using the D value stroke amount with respect to the predetermined angle, the finished angle surely falls within the allowable value (step S9). Alternatively, in the case of a blank material whose “D value control bending error” is outside the allowable value, bending is not performed (step S10).
[0102]
In the blank material in which the “D value control bending error” is within the allowable value, normal bending is performed by the press brake 5 at the D value based on the average plate thickness and material constant (step S11).
[0103]
With respect to “the sandwiching angle control bending error”, it is determined by the sandwiching angle bending error determination unit 67 whether the “sandwiching angle control bending error” of each blank material is within an allowable value.
[0104]
In the case of a blank material whose “pinch angle control bending error” is outside the allowable value, the spring back amount is obtained based on the actual sheet thickness and material constant of the blank material in the same manner as the D value control described above. A sandwiching angle with respect to a predetermined angle is calculated based on the back amount. Therefore, since the bending process is performed by the press brake 5 using the sandwiching angle with respect to the predetermined angle, the finished angle surely falls within the allowable value (step S9). Alternatively, in the case of a blank material whose “pinch angle control bending error” is outside the allowable value, the bending process is not performed (step S10).
[0105]
In the blank material in which “the sandwiching angle control bending error” is within an allowable value, a normal bending process is performed by the press brake 5 at the sandwiching angle based on the average plate thickness and material constant (step S11).
[0106]
As described above, the actual plate thickness and material constant of each blank material are measured during blanking before blanking, and this measurement information is reflected in the bending process, enabling efficient and accurate bending. Done. Further, for example, a mass of a blank material having a small bending error simplifies the inspection time, so that the inspection time after bending is shortened.
[0107]
Next, as a second embodiment, another plate material processing method using the plate material processing system having the above configuration will be described. It should be noted that the same parts as those of the first embodiment described above are omitted in the description.
[0108]
The difference from the first embodiment is that when detecting the actual plate thickness distribution and material constant distribution of the workpiece W, in the first embodiment, blanking is performed by blanking each blank material with the turret punch press 3 in the first embodiment. Although it is calculated | required, in 2nd Embodiment, it is calculated | required at the time of a test punching process with a discard hole, and the blanking process is performed after determining whether each bending error mentioned above is in tolerance value or not. It is in.
[0109]
Referring to FIG. 14, steps S21 and S22 are the same as steps S1 and S2 in FIG.
[0110]
As shown in FIG. 15, the workpiece W has been determined to be cut off for each blank material, and a trial punching-out hole 133 for measuring plate information is positioned in the gap between the blank materials (step S23). .
[0111]
The machining program including the trial punching hole 133 in the workpiece W and the development data of each blank is sent to the control device 19 of the turret punch press 3. In the turret punch press 3, the discard hole 133 is actually punched based on the above processing program as shown in FIG. However, each blank is not stamped.
[0112]
In the plate thickness / material constant detection unit 39 of the control device 19, the material constants such as plate thickness and tensile strength at each punching position are calculated when each discard hole 133 is punched. The actual plate thickness distribution and material constant distribution of W are calculated. This is almost the same as step S3 in FIG. 7 of the first embodiment.
[0113]
Therefore, the actual plate thickness and material constant of each blank material are determined from the above plate thickness distribution and material constant distribution (step S24).
[0114]
Moreover, the specific blank material which has average board thickness and tensile strength in each blank material is extracted similarly to step S4 of FIG. 7 of 1st Embodiment. Alternatively, a test piece to be crushed is determined as shown in FIG. 17 (step S25).
[0115]
Next, in the control device 19, based on the actual plate thickness and material constant of each of the above-mentioned blank materials, one of three types of “elongation error”, “D value control bending error”, and “sandwich angle control bending error” is selected. At least one of them is predicted.
[0116]
The above-described “elongation error” will be described in more detail. The plate thickness / material constant detection unit 39 of the control device 19 calculates the elongation value of each blank material based on the actual plate thickness and material constant of each blank material. . On the other hand, the “average elongation value” is calculated based on the average plate thickness and the actual plate thickness and material constant of the blank material having the material constant among the blank materials. The difference between this “average elongation value” and the actual actual elongation value of each blank is the “elongation error”.
[0117]
The above “D value control bending error” and “sandwich angle control bending error” are the same as step S5 in FIG. 7 of the first embodiment (step S26).
[0118]
Steps S27 and S28 are the same as steps S6 and S7 in FIG.
[0119]
Referring to FIG. 14, whether or not each error is within an allowable value is determined by the following determination units of control device 19 (step S <b> 29).
[0120]
With regard to “elongation error”, it is determined whether or not the “elongation error” of each blank material is within an allowable value by the elongation error determination unit 63.
[0121]
In the case of a blank material whose “elongation error” is outside the allowable value, the developed dimension is recalculated by the automatic programming device 1 or the like with the elongation value calculated based on the actual thickness and material constant of each blank material ( Step S30). Alternatively, when the blank material has an “elongation error” outside the allowable value, the bending process is not performed (step S31).
[0122]
For the blank material whose “elongation error” is within the allowable value, the development dimension is calculated by the automatic programming device 1 or the like based on the average plate thickness, the blank material having the material constant, or the elongation value of the test piece (step S32).
[0123]
Each blank material is punched by the turret punch press 3 based on the developed dimensions in the above-described step S30 and step S32, and blanking is performed (step S33).
[0124]
Each blank material is bent by the press brake 5 (step S34).
[0125]
In other words, “D value controlled bending error” and “sandwich angle controlled bending error” are determined after it is determined whether “D value controlled bending error” or “sandwich angle controlled bending error” of each blank material is within an allowable value. The bending process is performed in the same manner as in step S9 or step S11 of the first embodiment.
[0126]
Alternatively, if the “D value control bending error” and the “pinch angle control bending error” are blank materials that are outside the allowable values, the bending process is not performed (step S31).
[0127]
As described above, the actual plate thickness distribution and material constant distribution of the workpiece are measured during trial punching before bending, so the actual plate thickness and material constant of each blank are determined, and this measurement information is accurate. This is reflected in the development and blanking of each blank material. In addition, since the measurement information is reflected in the bending process, the bending process is performed efficiently and accurately. Further, for example, a mass of a blank material having a small bending error simplifies the inspection time, so that the inspection time after bending is shortened.
[0128]
In addition, this invention is not limited to embodiment mentioned above, It can implement in another aspect by making an appropriate change.
[0129]
In the embodiment described above, the bending error and the like are calculated in the punching machine control device, but may be calculated by another computer such as a network.
[0131]
[ The invention's effect ]
As can be understood from the above description of the embodiments of the present invention, claim 1 According to the invention, since the actual plate thickness and material constant of each blank material can be measured during blanking before blanking, this measurement information can be reflected in the bending and efficient and accurate bending can be performed. Yes. In addition, for example, a mass of blank material with a small bending error simplifies the inspection time, so that the inspection time after bending can be shortened.
[0132]
Also predict Because it is possible to calculate the elongation error of each blank material, it is possible to perform actual bending according to whether or not this elongation error is within the allowable value, improving product accuracy, improving work efficiency during bending, The inspection time after bending can be shortened.
[0133]
Claim 2 According to the invention, since the actual plate thickness distribution and material constant distribution of the workpiece can be measured at the time of trial punching before bending, the actual plate thickness and material constant of each blank material can be determined. This measurement information can be reflected in the accurate development and blanking of each blank material, and can also be reflected in the bending process, so that an accurate and accurate bending process can be performed.
In addition, for example, a mass of blank material with a small bending error simplifies the inspection time, so that the inspection time after bending can be shortened.
[0134]
Claim 3 According to the invention, since the elongation error of each blank material can be calculated in advance, it is possible to perform bending according to whether or not this elongation error is within an allowable value. The work efficiency can be improved and the inspection time after bending can be shortened.
[0135]
Claim 4 According to the invention, since the bending error in the stroke amount control of each blank material can be calculated in advance, blanking processing or bending processing is performed in accordance with whether or not this bending error is within an allowable value, Product accuracy can be improved, work efficiency during bending can be improved, and inspection time after bending can be shortened.
[0136]
Claim 5 According to the invention, since it is possible to calculate the bending error in the sandwiching angle control of each blank material in advance, blanking processing or bending processing is performed in accordance with whether or not this bending error is within an allowable value, Product accuracy can be improved, work efficiency during bending can be improved, and inspection time after bending can be shortened.
[0137]
Claim 6 According to the invention, since the actual plate thickness distribution and material constant distribution of the workpiece can be measured at the time of punching before bending, the actual plate thickness and material constant of each blank material can be determined. By reflecting this measurement information on the development and blanking of each blank material accurately, or by reflecting it in the bending process, an accurate and accurate bending process can be performed.
In addition, for example, a mass of blank material with a small bending error simplifies the inspection time, so that the inspection time after bending can be shortened.
[0138]
Also , Because it is possible to calculate the elongation error of each blank material, it is possible to perform actual bending according to whether or not this elongation error is within the allowable value, improving product accuracy, improving work efficiency during bending, The inspection time after bending can be shortened.
[0139]
Claim 7 According to the invention , Because it is possible to calculate the elongation error of each blank material, it is possible to perform actual bending according to whether or not this elongation error is within the allowable value, improving product accuracy, improving work efficiency during bending, The inspection time after bending can be shortened.
[0140]
Claim 8 According to the invention , Therefore, since the bending error can be calculated by controlling the stroke amount of each blank material, blanking and bending are performed in accordance with whether or not this bending error is within the allowable value. It is possible to improve the working efficiency during processing and shorten the inspection time after bending.
[0141]
Claim 9 According to the invention , Therefore, since the bending error can be calculated by controlling the sandwiching angle of each blank, blanking and bending are performed in accordance with whether or not the bending error is within an allowable value, which improves product accuracy, It is possible to improve the working efficiency during processing and shorten the inspection time after bending.
[Brief description of the drawings]
FIG. 1 shows an embodiment of the present invention and is a schematic front view of each device used in a plate material processing system.
FIG. 2, showing an embodiment of the present invention, is a block diagram of a control device of a punching machine.
FIG. 3 shows an embodiment of the present invention and is a stroke / load diagram at the time of punching.
4 shows an embodiment of the present invention and is an enlarged side view of a measurement indicator portion of the bending machine in FIG. 1. FIG.
FIG. 5 is a cross-sectional view showing an internal configuration of a detection head according to an embodiment of the present invention.
FIG. 6 is a block diagram of a control device for a bending machine (press brake) according to an embodiment of the present invention.
FIG. 7 is a flowchart showing the first embodiment of the present invention.
FIG. 8 is a plan view of each blank material in the worksheet according to the first embodiment.
FIG. 9 is a thickness distribution diagram of the worksheet according to the first embodiment.
FIG. 10 is an explanatory diagram of “elongation error” in the first embodiment.
FIG. 11 is an explanatory diagram of “D value control bending error” in the first embodiment;
FIG. 12 is an explanatory diagram of a “pinch angle control bending error” according to the first embodiment.
FIG. 13 is an explanatory diagram of a display state of a message according to the first embodiment.
FIG. 14 is a flowchart showing a second embodiment of the present invention.
FIG. 15 is a development plan view of a blank hole and each blank material in the worksheet according to the second embodiment.
FIG. 16 is a state diagram of a punching process of a discarded hole in the worksheet according to the second embodiment.
FIG. 17 is an explanatory diagram showing the position of a test piece on the worksheet according to the second embodiment.
[Explanation of symbols]
1 Automatic programming device
3 Turret punch press (punch machine)
5 Press brake (bending machine)
19 Control device
23 Hydraulic cylinder
29 Lamb
39 Plate thickness / material constant detector (plate thickness / material constant calculation unit)
41 Encoder
43 Position detector
55 Main controller
59 Pressure sensor
61 memory
63 Elongation error determination section (Elongation error determination means)
65 D-value bending error determination section (stroke control bending error determination means)
67 Pinch angle bending error judgment section (Pinch angle control bending error judgment means)
85 Pressure sensor
87 Position scale
91 Position sensor
95 Bending angle measuring device
97 Controller
107 Indicator for measurement
109 Detection head

Claims (9)

In the blanking process before bending the workpiece, punching of each blank material is performed based on the nominal thickness and nominal material constant of the workpiece, and based on the ram stroke and pressure data detected at the time of punching. The actual plate thickness distribution and material constant distribution of the workpiece are calculated, and the actual plate thickness and material constant of each blank are determined based on the plate thickness distribution and material constant distribution. per the performing bending each blank based, bending each blank described above, the actual plate thickness of the blank, to calculate the elongation value of each blank on the basis of material constants, and the elongation value Judge whether or not the difference between the nominal thickness of the workpiece and the elongation value obtained from the nominal material constant is within the allowable value, and the blank material within the allowable value is bent based on the average thickness and material constant, Outside the tolerance The blank key dimensions portions actual plate thickness preferentially a work sheet processing method characterized by abort the or bending performing bending on the basis of material constants that.   In the blanking process before bending the workpiece, trial blanking is performed in the gap of each blank material developed based on the nominal thickness and nominal material constant of the workpiece, and various data on the ram stroke and pressure detected at the trial blanking Based on the above, the actual plate thickness distribution and material constant distribution of the workpiece are calculated, and the plate thickness distribution and material constant distribution are used to determine the actual plate thickness and material constant of each blank material. A plate material processing method comprising: developing each blank material based on a material constant and performing blanking processing, and bending each blank material based on an actual plate thickness and material constant. The blanking processing of each blank material described above calculates the elongation value of each blank material based on the actual thickness and material constant of each blank material, and this elongation value and the average plate thickness and material of each blank material Judges whether the difference from the average elongation value obtained from the blank material with a constant is within the allowable value, and blank material within the allowable value is expanded based on the average plate thickness and material constant and blanked 3. The plate material processing method according to claim 2 , wherein the blank material outside the allowable value is developed based on an actual plate thickness and material constant and blanking is performed or blanking is stopped. The above-mentioned bending of each blank material is calculated based on the actual plate thickness, material constant, and the stroke amount when bending the blank material having the average plate thickness and material constant of each blank material at a predetermined angle. It is judged whether the angle when the blank material is bent with the same stroke amount is within the allowable value with respect to the predetermined angle, and the blank material within the allowable value is bent with the same stroke amount, and the blank is outside the allowable value 3. The plate material processing method according to claim 1, wherein the material is bent with a stroke amount calculated based on the individual plate thickness and material constant, or the bending is stopped. The bending of each blank material described above was performed by calculating the sandwiching angle by calculating the springback amount of the blank material having the average plate thickness and material constant of each blank material, and bending the other blank materials to the same sandwiching angle. Judge whether or not the finished angle is within the allowable value, and bend the blank material that is within the allowable value at the same sandwiching angle. The blank material that is out of the allowable value is based on the individual plate thickness and material constant. calculates the angle sandwiched seeking springback, sheet processing method according to claim 1 or 2, wherein the performing bending at this pinching angle. Automatic programming device that develops blanks based on workpiece thickness and material constants, punching machine that punches and blanks workpieces in cooperation with punches and dies, and punching workpieces with punching machines The actual plate thickness distribution and material constant distribution of the workpiece are calculated based on the detected ram stroke and pressure data, and the actual plate thickness and material of each blank are calculated from the calculated plate thickness distribution and material constant distribution. A control device having a plate thickness / material constant calculating device for determining a constant, and a bending machine for bending each blank material based on the actual plate thickness and material constant of each blank material , the control device The difference between the elongation value of each blank material calculated based on the actual plate thickness and material constant of each blank material and the elongation value obtained from the nominal plate thickness and nominal material constant of the workpiece is within the allowable value. Plate material processing system that characterized in that it comprises an elongation error determination means for determining whether. The said control apparatus is the average elongation calculated | required from the blank material which has the average board thickness of each blank material, and the average board thickness of each blank material, and the material constant calculated based on the actual board thickness and material constant of each blank material. The plate material processing system according to claim 6 , further comprising an elongation error determination unit that determines whether or not a difference from the value is within an allowable value. The control device calculates the stroke amount when bending a blank material having an average plate thickness and material constant among the blank materials to a predetermined angle based on the actual plate thickness and material constant, 7. The plate material processing system according to claim 6 , further comprising stroke control bending error determination means for determining whether an angle when the blank material is bent is within an allowable value with respect to a predetermined angle. The control device calculates the sandwich angle by obtaining the spring back amount of the blank material having the average plate thickness and material constant of each blank material, and the finished angle after bending the other blank materials to the same sandwich angle is The plate material processing system according to claim 6 , further comprising a sandwiching angle control bending error determination unit that determines whether or not the value is within an allowable value.

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