JPH08257641A - Method and device for correcting go size for working of work with sheet metal working machine - Google Patents

Abstract

PURPOSE: To rapidly and exactly obtain the set sizes of correct back gages by subjecting a sheet metal work to trial working at the time of initial setting of the back gages, measuring the sizes, inputting the actually measured sizes to an NC unit and determining correction rates. CONSTITUTION: The back gages 1 are first set in the normal initial positions and the trial bending, etc., of the work W are executed in sheet metal working. The height sizes(a), (b) of the two pieces of the right and left flanges 5 of the work product are measured as a result thereof and whether the sizes are correct to the prescribed values or not is checked. The actual working operation is started if the results are correct. The actually measured sizes are inputted to the NC unit if the results are not correct. The control section of the NC unit executes calculation in accordance with a set program and emits driving commands to respective ball screw mechanisms to automatically correct the go sizes of the right and left back gages 1, 1. The trial bending is executed again in the corrected back gage positions and the sizes thereof are measured. The actual production working operation is started if the results are correct.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for correcting a dimension of a workpiece as machined by a back gauge device of a sheet metal working machine such as a press brake, a shearing machine and a punch press.

[0002]

2. Description of the Related Art As an example of this type of sheet metal working machine, in a sheet metal work bending machine such as a press brake, the work rear end for the operator is hit by a pair of left and right back gauge devices as conventionally known. By touching,
It is configured to set a predetermined bending line position (passage dimension).

FIG. 1 is a top view showing the outline of the main part. W is a sheet metal work to be bent, and an example of a simple product of the bent groove is shown in FIG. The work W has a bending line whose bending line is the bending process V of the lower die D of the press brake.
At a predetermined distance (dimension) L, a pair of left and right back gauges 1 are arranged behind the die D (in the x direction) on the machine frame in the horizontal left and right directions so as to be set in the groove position. It is configured.

In the figure, reference numeral 2 is a stretcher member in which left and right back gauges (contact portions) 1 are respectively arranged, and both ends of the stretch member 2 are provided on a pair of post members 3 (not shown). Each of them is configured to be movable in the front-rear direction by a motor driven by a ball screw mechanism.

X is the longitudinal machine center line of the press brake, M is the distance between the ball screw mechanisms on both post members 3, B is the width (folding length) of the work W, Y _L , Y _R
Indicates respective distances from the machine center line X of the left and right back gauges 1, and P indicates a work W bending position center point.

Due to such a positional relationship, the product W is constructed so that the bent flange portion 5 having the right and left regular height dimensions a and b as shown in FIG. 2 can be obtained during the actual working of the press brake. ing.

However, in practice, the back gauge 1
Even though the parallelism of the punches is set correctly as shown in FIG. 1, the punch which is the upper die depending on the product shape or the presence or absence of burrs on the edge of the workpiece W contacting each back gauge 1. The left and right rising dimensions a and b of the bending flange portion 5 processed by the die (not shown) and the lower die D may be slightly different from the required dimensions. In order to correct this, as shown in an example of a schematic plan view of the main part of FIG. 3, the center line of the V-shaped groove for bending of the lower die,
When the left and right back gauge contact surfaces are located on both the left and right posts, the respective correction values for obtaining the predetermined dimensions are calculated and input to the respective initial dimensions L and L2 values. The position needs to be corrected.

Conventionally, the input value for correcting the abutting position of the back gauge 1 is based on the measured value by the operator himself performing the trial bending of the work W, measuring the dimension of the processed product. I had to calculate.

[0009]

However, in order to correct this kind of difference in the left and right dimensions, it depends on the bending length and bending position of the work W, so that this measurement and It takes time and labor to perform the calculation, and the calculation is relatively difficult for the site worker.

The present invention has been made in view of the problems of the conventional example as described above in the sheet metal working machine of this type. When the workpiece is machined in the sheet metal working machine equipped with the back gauge device of this type, The purpose of the present invention is to provide a means for improving the production efficiency by quickly and accurately calculating and setting the correct back gauge setting dimension in accordance with the result of the trial machining at the time of initial setting of the back gauge.

[0011]

For this reason, in the present invention, in a sheet metal working machine for setting the dimensions of sheet metal processing by bringing the rear edge of the sheet metal work into contact with a pair of left and right pack gauges, Based on the left and right back gauges respectively set at the initial positions, trial processing of the sheet metal work is performed, and the dimension values of the left and right of the processed work are measured as described above. By inputting the calculation program into the NC device, the respective correction amounts for the left and right passage dimensions of the initial position are automatically calculated, and the respective initial positions of the left and right back gauges are set to correct correction values. Adopting a method for correcting the dimension of a sheet metal working machine having the above-mentioned steps for setting and a NC device for executing this method. More, it is intended to achieve the above purpose.

[0012]

According to the method and apparatus of the present invention as described above, the dimension values of the test-machined workpiece at the initial setting position of the back gauge are actually measured and automatically input by the predetermined program by inputting them to the NC apparatus. Since each correction amount is calculated in, and the correct correction position is set quickly,
It becomes possible to shift to production processing work in a single hour, and production efficiency can be improved.

[0013]

EXAMPLES The present invention will be described below with reference to the left-right height dimension a of the processing flange 5 portion shown in FIG.
An example of an embodiment of the method / apparatus for correcting the through-dimension in the case of the product having b will be described with reference to FIGS. 3 and 4 to 6.

FIG. 4 is an xy diagram for explaining the principle of dimensional correction as shown in FIG. 3, FIG. 5 is a flowchart of the procedure for carrying out the same, and FIG. 6 is an actual correction value calculation for position correction. The example of a display screen of the NC apparatus operation part for performing is shown.

In the xy diagram of FIG. 4, the symbols are set as follows: YL: the position of the left back gauge 1 YR: the position of the right back gauge 1 F: the flange length set value P: Bent position center point of work W B: Bent length position of work W M: Distance between the ball screw mechanisms on the left and right posts 3 on the x axis a: Actual measured flange height (left end of work W) b: Flange Height measurement value (right end of work W) L ': correction amount of normal L value L ₂ ': correction amount of L ₂ value θ: abutting angle of work W before and after correction with respect to the left and right directions When used, the correction amounts L ′ and L ₂ ′ to the L and L ₂ values are finally obtained by the following relational expressions in FIG. These calculation procedures are programmed in the NC device, and automatic calculation is easily performed by inputting the actually measured values of the left and right flange heights a and b of the trial bending work W to the NC device operation part (see below-described figure). 5 and 6).

[0016]

[Equation 1]

Next, based on the flowchart of FIG.
As described above, the procedure for performing the dimension correction will be described. First, in step S1, prior to the actual shift to the production / processing operation,
The back gauge 1 is set to the regular initial position and the trial bending of the work W is performed.

Next, in step S2, the actual flange heights a and b at the two right and left positions of the work product are measured based on this result, and it is confirmed whether these dimensions are correct with respect to a predetermined value. If this result is correct, the process goes straight to step S6 to shift to the next actual production / processing work, but if not correct, the process proceeds to step S3 to input the measured dimensions a and b into the operation unit of the NC device. To do.

As a result, the NC device operating portion performs an operation based on these values in step S4 based on a predetermined setting program to automatically correct the dimensions of the left and right back gauges. Issues a drive command to the screw mechanism. Next, in step S5, trial bending is performed again at each of the corrected back gauge positions, the a and b dimensions are measured again, and if this is accurate, the process proceeds to the production processing of step S6. On the other hand, if it is inaccurate, the process returns to step S3 to repeat the above operation.

The above sequence is displayed on the display unit of the NC unit operation unit as shown in FIG. 6, for example, and the actual worker performs predetermined measurement and input according to the instruction,
Dimensional correction can be performed very easily as described above.

(Other Embodiments) In the above embodiment, for the sake of convenience of explanation, the case of the product example having the flange portion 5 of the simple shape shown in FIG. Of course, the present invention is not limited to this, and it is also possible when the work W has a plurality of bent portions on each side, or is not limited to only bending such as a press brake, and the shearing machine is not limited thereto. Needless to say, the present invention can be applied to various sheet metal working machines such as a punch press having a back gauge device that requires setting of dimension lines according to the intended processing as in the present embodiment.

[0022]

As described above, according to the method and apparatus of the present invention, in the sheet metal working machine for setting the size of the workpiece as it is machined by using the back gauge device, the left and right machining parts of the trial machining product of the workpiece are processed. By inputting the actual measurement values into the NC device, the required correction dimensions are automatically obtained by a predetermined program, and the correct positions of the left and right back gauges are automatically adjusted. Can improve the work efficiency and
Accurate street dimensions can be obtained by a single test process,
It is possible to eliminate the waste of materials and time due to repeated trial and error as in the past.

[Brief description of drawings]

1] Top view of back gauge device

[Fig. 2] Example of product

[Fig. 3] Schematic top view of main parts when correcting back gauge position

FIG. 4 is an x, y diagram showing the dimension correction principle.

FIG. 5 is a sequence flowchart of a correction execution order.

[Fig. 6] Display screen side of NC device operation unit

[Explanation of symbols]

1 Back gauge 2 Stress member 3 Post member 4 V-shaped groove bottom of die 5 Flange a Flange length measured value (left end) b Flange length measured value (right end) B Workpiece bending length D Die L passing dimension value L ² Street dimension value (L when the back gauge is inclined
L'L value correction amount L ² 'L ² value correction amount M x Distance between the left and right ball screw mechanisms on the x axis Y _L Left back gauge position Y _R Right back gauge position F Flange length Setting value P Work bending position center point

Claims (2)

[Claims] 1. A left and right back gauges set at initial positions respectively in a sheet metal working machine for setting dimensions according to sheet metal working by bringing a rear edge of a sheet metal work into contact with a pair of left and right back gauges. On the basis of the above, a trial machining of the sheet metal work is performed, the dimension values of the left and right sides of the machined work are measured, and these measured values are input to an NC device in which a predetermined calculation program is incorporated. According to the above, each step for automatically calculating the respective correction amounts for the left and right passage dimensions of the initial position and setting the respective initial positions of the left and right back gauges to the correct correction value is provided. Dimension correction method according to the work processing of the sheet metal processing machine. 2. An input unit for executing the correction method according to claim 1 for inputting each of the measured values, and a predetermined calculation program for calculating each of the correction amounts based on these measured values. And a machining unit for a sheet metal working machine work, which comprises an NC device including a drive command unit for correcting the back gauge position by these correction values and a display unit for instructing the input. Dimension correction device.