JP2002028727A - Bending method and its bender - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bending method by a bender and its bender capable of improving an actual working time and a precision by automatically calculating a L value. SOLUTION: Trial bending is conducted based on a D value and the L value calculated by an arithmetic part on the basis of CAD information, a bending angle and a flange length of a product P bent by trial bending are measured, the measured values are inputted in conformance with the cross sectional shapes displayed on display pictures for respective processes, when a comparison/ judgment part compares the measured values to objective values of the bending angle/flange length and then judges that the measured values and the objective values are not equal, correction values are calculated based on the differences between the measured values and the objective values, bending is conducted for the D value/L value based on the corrected values. Further, when the comparison/judgment part compares the bent angle/flange length to the corrected D value/L value and then these are not equal, measurement and correction are repeated, and then bending is conducted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a vender,
More specifically, the present invention relates to a vendor that performs automatic processing by NC.

[0002]

2. Description of the Related Art Conventionally, in bending by a bender, an operator performs trial bending, measures angles and dimensions,
In general, the L value is calculated and calculated in consideration of the elongation value or the like, and the L value is generally input for each process (or for all processes). The deviation of the L value increases with the number of times of bending, the order, and the like. However, the automatic calculation is not performed, and the operator currently calculates the L value.

[0003]

However, while the setup time is being reduced by increasing the precision of the bender and the automatic die changing system, processing of a more complicated product using a step bend or the like is required. Seems to increase. Alternatively, the task of processing a repeat product is expected to be greatly increased by NC, but there is a problem that the effect is reduced by half since there is a large variation between machines.

An object of the present invention is to pay attention to the above-mentioned problems of the prior art, and to automatically calculate an L value correction to improve the actual machining time and the accuracy. It is an object of the present invention to provide a bending method and a vendor by a vendor capable of performing the bending.

[0005]

In order to achieve the above object, a bending method by a bender according to the present invention according to claim 1 determines a bending order and a mold on the basis of CAD information, and then determines a bending order and a die for each step. The D value and the L value are calculated, a test bending is performed based on the calculated D value and the L value, the bending angle and each flange length by the test bending are measured, and the measured values are displayed for each process. Along with inputting according to the display screen, a correction amount of the bending angle or the flange length is calculated for each process from the difference between the actual measurement value and the target value, and displayed on the display screen. The bending process is performed based on the D value and the L value corrected for each bending process.

Therefore, test bending is performed based on the D value and L value calculated based on the CAD information, and the bending angle and the flange length of the product bent by the test bending are measured and displayed for each process. Enter the actual measurement value according to the display screen to be compared, and compare the actual measurement value with the target values of the bending angle and the flange length, and if they cannot be considered to be equal, based on the difference between the actual measurement value and the target value. Calculate the correction value,
Bending is performed on the D value and L value corrected based on this correction value.

According to a second aspect of the present invention, there is provided a bending method by a bender according to the first aspect of the present invention, based on the D value and the L value corrected for each bending step in consideration of the correction amount. The bending angle and the flange length processed in the above are compared with the target values, and when it is determined that they are not the same, the actual measurement and the correction amount are calculated again, and in consideration of this correction amount, each bending process is performed. The bending process is performed based on the corrected D value and L value.

Accordingly, the bent angle and the flange length are measured in consideration of the D value and the L value calculated in consideration of the correction amount, and the measured value is compared with the target value to determine if the values are not the same. Calculates the amount of correction, and repeats the correction of the L value and the D value to perform bending.

[0009] The vendor of the invention according to claim 3 is a CAD system.
A bender that determines a bending order and a mold based on information and performs bending by controlling an NC device,
The apparatus calculates a D value and an L value for each process, and measures a bending angle and a flange length of a test-bent product based on the D value and the L value, and calculates an actual measurement value for each process. A display screen for displaying a cross-sectional shape for each step, and input means for inputting the actual measurement values, and the actual measurement values of the bending angle and the flange length input by the input means are calculated by the calculation unit. And a comparison judging unit that compares the target value with the target value. The arithmetic unit calculates a correction amount from the measured value and the target value.

Therefore, a trial bending is performed based on the D value and the L value calculated by the arithmetic unit based on the CAD information, and a bending angle and a flange length of a product bent by the trial bending are actually measured. When the measured value is input from the input means in accordance with the cross-sectional shape displayed on the display screen for each case, and the comparison / determination unit compares the measured value with the target values of the bending angle and the flange length, and cannot determine that they are equal. In, the calculation unit calculates a correction value based on the difference between the actually measured value and the target value, and performs bending on the D value and the L value corrected based on the correction value. Further, the comparison / judgment unit compares the bent angle and flange length with the corrected D value and L value, and if they are not the same, repeats actual measurement and correction to perform bending.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 3 and 4 show the press brake 1 as a bender. Here, since the press brake 1 can be a commonly used press brake, a detailed description thereof will be omitted and only a brief description will be given. The press brake 1 has side plates 3 on the left and right sides. An upper table 5 is provided on an upper front surface of the side plate 3 and a lower table 7 is provided on a lower front surface of the side plate 3.

An upper mold 9 is removably mounted on the upper table 5, and a lower mold 11 is mounted on the lower table 7.
The upper table 5 is moved up and down by a driving means 13 (see FIG. 2), and the work W is bent in cooperation with the upper mold 9 and the lower mold 11.

Further, the press brake 1 is provided with a back gauge device 15 for determining the position (L value, see FIG. 7) of the work W in the front-rear direction (left-right direction in FIG. 4) so as to be movable and positionable in the front-rear direction. Have been.

With the above configuration, the work W is positioned by bringing the work W into contact with the back gauge device 15 positioned at the determined L value, and the work W is positioned and bent to a predetermined position.

An NC device 17 is provided adjacent to the press brake 1, and controls the operation of the driving means 13 in the press brake 1 and the operation of the back gauge device 15.

FIG. 2 shows the configuration of the NC unit 17. The NC unit 17 is a CPU 1 serving as a central processing unit.
The CPU 19 is connected to input means 21 such as a keyboard for inputting various data, and display means 23 having a display screen such as a CRT for outputting various information. ing.

The CPU 19 has a memory 25 for storing input data, machining programs, and the like, an arithmetic unit 27 for calculating correction values and the like as described later, an actually measured bending angle and flange length. Is compared with the target value. Further, a D value command unit 31 for controlling the distance between the upper die 9 and the lower die 11 to control the driving means 13 to obtain a desired bending angle, and a back gauge device 15 for obtaining a desired flange length. An L value command unit 33 for controlling the front / rear position is connected.

Next, a bending method by a bender according to the present invention will be described with reference to FIG. First, a three-dimensional view, a development view, and the like are created based on the input CAD information (step S1, see FIG. 5), the bending order is determined and displayed on the display screen of the display unit 23 (see step S2, FIG. 6). ). The bending order can be determined automatically, or may be input by an operator. In FIG. 6, two-dot chain lines and-indicate bending lines.

From the work data (material, flange length, bending length, angle, etc.) in the inputted CAD information, the relative distance between the upper mold 9 and the lower mold 11 as shown in FIG. 7 is obtained. A bending program for calculating the D value and the L value that is the position of the back gauge device 15 is determined (step S3, see FIG. 8).

Then, trial bending is performed (step S).
4). In the NC device 17, since the bending order is all determined, when the L value (or the shape and the three-dimensional drawing) is input, the bending process is performed by obtaining the L values of all the processes by automatic calculation.

Referring to FIG. 9, each flange length L1,
L2 and L3 are measured using calipers and the bending angle is measured (step S5). The flange lengths L1, L2, L3 and the bending angles measured in step S5 are input (step S6), and displayed on the display screen of the display means 23 together with the L value, the shape of the product P, and the like (see FIG. 10). .

The calculation unit 27 of the NC unit 17 calculates a correction amount based on the difference between the input measured value and the target value (step S7) and displays it on the display screen of the display unit 23 (see FIG. 11). ). The D value correction amount β is βi = f ₀ (θ _0i
−θ _i ), the L value correction amount α is calculated from α _i = L _0i −L _i . Here, θ _0i is the target bending angle in step i, θ _i is the measured value of the bending angle in step i, L
_0i is the target L value in step i, _{L i} denotes the measured value of the L value in step i.

Then, main bending is performed on the new work based on the correction amounts α and β obtained in step S7 (step S8). It is determined whether the target angle and the flange length have been obtained in the main bending (step S9), and if they have been obtained, the bending process is terminated (step SE). If it is determined that it has not been obtained, the process returns to step S6 and the subsequent steps are repeated.

From the above results, the operator has been calculating the L value correction amount for each process in consideration of the bending order and the like one process at a time.
Automatically calculates the correction amount, so that the actual machining time can be improved, the accuracy can be improved, and input errors and calculation errors can be eliminated, and variations among machines can be reduced.

It should be noted that the present invention is not limited to the above-described embodiment of the present invention, but by making appropriate changes,
It can be implemented in other aspects. That is, the above-described correction amount calculation and the like are performed not only by the NC device 17 but also by the C
It can also be calculated in AM.

[0027]

As described above, in the bending method by the bender according to the first aspect of the present invention, the test bending is performed by the D value and the L value calculated based on the CAD information, and the bending is performed by the test bending. Actually measure the bending angle and flange length of the product, input the actual measurement value according to the display screen displayed for each process, compare this actual measurement value with the target value of the bending angle and flange length, If they cannot be considered equal, a correction value is calculated based on the difference between the actual measurement value and the target value, and the D corrected based on this correction value is calculated.
Since the bending process is performed for the L value and the L value,
It is not necessary to calculate the correction amounts of the L value and the D value for each process, and the processing efficiency can be improved. In addition, since the L value and the D value are corrected by automatic calculation, input errors and calculation errors can be prevented, and processing accuracy can be improved.

In the bending method by the bender according to the second aspect of the invention, the angle and flange length bent by the corrected D value and L value are compared with the target D value and L value. Since the bending is performed by repeating the actual measurement and the correction, the bending can be performed with high precision.

According to a third aspect of the present invention, the vendor
Test bending is performed based on the D value and the L value calculated by the calculation unit based on the D information, and the bending angle and the flange length of the product bent by the test bending are actually measured. An actual measurement value is input from the input means in accordance with the cross-sectional shape shown, and the comparison / determination unit compares the actual measurement value with the target values of the bending angle and the flange length. Since a correction value is calculated based on the difference between the actual measurement value and the target value, and the D value and the L value corrected based on the correction value are subjected to bending,
This eliminates the need for the operator to calculate the correction amounts of the L value and the D value for each process, thereby improving the processing efficiency. Also, since the L value and D value are corrected by automatic calculation,
Processing errors can be improved by preventing input errors and calculation errors. Furthermore, the bent angle and flange length are compared with the corrected D value and L value, and if they are not the same, the actual measurement and correction are repeated to perform the bending process, so that high-precision bending process is performed. Can be. Also,
Since the measured value is input according to the display screen displayed for each process, it is possible to prevent an input error from occurring and to input easily.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a bending method by a bender according to the present invention.

FIG. 2 is a block diagram showing a configuration of a control device in the vendor according to the present invention.

FIG. 3 is a front view showing the entirety of the vender according to the present invention.

FIG. 4 is a side view as viewed from a direction IV in FIG. 3;

FIG. 5 is an NC device showing CAD information.

FIG. 6 is an explanatory diagram showing a state in which a bending order is determined.

FIG. 7 is an explanatory diagram of an L value and a D value.

FIG. 8 is an explanatory diagram illustrating determination of a bending program.

FIG. 9 is a cross-sectional view showing measured values after test bending.

FIG. 10 is an explanatory diagram showing a state where an actual measurement value is input.

FIG. 11 is an explanatory diagram showing calculated correction values.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Press brake (bender) 9 Upper die (die) 11 Lower die (die) 17 NC device 21 Input means 27 Operation part 29 Comparison judgment part P Product

Claims (3)

[Claims] After determining a bending order and a mold based on CAD information, a D value and an L value are calculated for each step,
Trial bending is performed based on the calculated D value and L value,
The bending angle and the length of each flange by this trial bending are measured, and the measured values are input according to the display screen displayed for each process, and the bending is performed for each process from the difference between the measured value and the target value. Calculating a correction amount of the angle or the flange length, displaying the correction amount on the display screen, and performing bending based on the D value and the L value corrected for each bending process in consideration of the correction amount. Bending method by vendor. 2. A bending angle and a flange length processed based on a D value and an L value corrected for each bending process in consideration of the correction amount are compared with the target values to determine that they are not the same. If the correction is performed, the actual measurement and the correction amount are calculated again, and the bending is performed based on the D value and the L value corrected for each bending process in consideration of the correction amount. A bending method by the bender according to 1. 3. A bender that determines a bending order and a mold based on CAD information and performs a bending process under the control of an NC device, and calculates a D value and an L value for each process; A display screen for displaying the cross-sectional shape of each process in order to actually measure the bending angle and the flange length of the test-bent product based on the D value and the L value and to input the measured value for each process; Input means for inputting a value, and a comparison judging section for comparing the measured values of the bending angle and the flange length inputted by the input means with the target values calculated by the calculating section, A unit for calculating a correction amount from the actual measurement value and the target value.