JPH04135024A - Operating method for detecting mis-registration of material on laser press working - Google Patents

Abstract

PURPOSE:To improve the working efficiency by setting an allowable range for the mis-registration of the material to be worked, comparing the mis-registration detected with the mis-registration detector to the allowable range of mis-registration on the working time, judging, and making as an error of the mis-registration of the material to be worked at the time when the amount of the mis-registration is made beyond the allowable range. CONSTITUTION:The position of the material to be worked just after clamping the material to be worked with the work clamp 5 is set as the standard value of the mis-registration amount (electric voltage) on the mis-registration detector 11a, 11b. The amount of the mis-registration of the material to be worked is continuously observed with the controlling means through the mis-registration detecting device in the working time. The amount of mis-registration detected during the working time is compared and judged with the allowable range of the positioning of the material to be worked which is set preliminarily, and when the amount of mis-registration from the mis-registration detecting device is made to out of the allowable range, the mis-registration of the material to be worked can be judged. Therefore, the shift of the material during working time can be dealt with rapidly, and the working efficiency can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an operating method for detecting material positional deviation in a processing machine such as a laser press.

<Prior Art> One of the general-purpose processing machines for sheet metal materials is a so-called laser press processing machine that combines punching with a punch and fusing processing with a laser beam.

In recent years, FA (factory
Automation is progressing, and even in laser press processing machines, etc., in order to automatically supply processing materials and automate processing, robots for supplying processing materials and robots for setting processing materials in predetermined positions are being introduced. A positioning device is provided.

This positioning device positions the workpiece by sucking the lower surface of the workpiece supplied by the robot with a suction bat and moving it to a predetermined reference position of the laser press machine.

A positioning device in a laser press processing machine will be explained based on FIGS. 8 and 9.

Figure 8 is a perspective view showing the state in which the workpiece clamp of the positioning device in the laser press machine grips the workpiece and the workpiece is processed by the laser press machine, and Figure 9 is the same as in Figure 8. An enlarged view of part D is shown.

A laser press rod 3 is arranged near the top surface of the base 1, and a laser press rod 3 is placed on the side of the laser press rod 3. ! ! A number of work clamps 5 are provided protrudingly. The workpiece clamp 5 is designed to hold the workpiece 7 between a pair of claws, and by contacting between the pair of claws, the workpiece material 7 is moved in the Y-axis direction (the direction in which it moves toward and away from the workpiece clamp 5). A reference plane E that serves as a reference is formed (see FIG. 9). A location pin 9 is provided on the upper surface of the base 1 as a reference in the X-axis direction (longitudinal direction of the laser brace 3), and the location pin 9 has a structure that can be stored within the base 1. Therefore, the workpiece 7 is positioned in the XY-axis directions by coming into contact with the reference surface E of the workpiece clamp 5 and the location pin 9.

A positioning confirmation sensor 11 is attached to the workpiece clamp 5, and the positioning confirmation sensor 11 is turned on when the workpiece 7 hits the reference surface of the workpiece clamp 5.

A right feed confirmation sensor 13 is attached to the base 1 side, and the right feed i confirmation sensor 13 is turned on when the workpiece 7 hits the location pin 9. In other words, when both the positioning confirmation sensor 11 and the right feed confirmation sensor 13 are turned ON, it is assumed that the workpiece 7 has been correctly set in the predetermined position of the laser press processing machine, and the claw of the workpiece clamp 5 is closed by the control unit (not shown). It is now possible to After confirming that the work clamp 5 is closed, the location pin 9 is housed in the base 1. Further, the work clamp 5 normally does not open until laser press processing (a series of operations of punching and laser processing) is completed. However, when using one workpiece 7 effectively, there are cases where the workpiece 7 is turned over 90° midway through use, and in such cases, the workpiece clamp 5 is automatically adjusted by the NC program. be opened. and,
Only at this time, the operator intervenes, flips the workpiece 7, presses the workpiece 7 against the reference surface of the workpiece clamp 5, closes the workpiece clamp 5 again using a start operation switch (not shown), and laser presses the workpiece 7. Continue.

In this way, when opening and closing the work clamp 5, the workpiece material 7
When the workpiece clamp 5 is opened and closed during positioning, and when the operator inverts the workpiece 7 and presses it against the reference surface of the workpiece clamp 5, and starts the machining operation using NC data by pressing a start operation switch (not shown). There is.

Next, an example of a general blanking process using a laser press machine will be explained based on FIG. 10.

FIG. 10 is an explanatory diagram showing an example of blanking processing in a laser press machine.

As shown in FIG. 8, the workpiece 7 is
While being held and positioned, a processing instruction is issued to the laser press processing machine from the aforementioned IIJm section (not shown). When a processing instruction is issued, the laser brace rod 3 moves in the X-Y direction according to the instruction of the NC data. The workpiece 7 is moved along with the movement of the laser brace 3, and the point P1 of x5 and Yl on the workpiece 7, which is used to confirm positional deviation, moves to the first punch position 1. At the moved point P1, round punching is performed using the minimum punch diameter used for cutting the board according to the instructions of the NC data (in this description, the punch diameter is assumed to be the same as that of point P2, which will be described later). Next, move to point P2 on X2, Y2 of product A and perform round punching, then move to point P3 on x1, Y3 and perform the same <P
Perform round punching with a punch diameter of 2. Then, X3 and Y4 are used to pre-punch product A for laser cutting.
Move to point P4 of product A and perform round punching with the smallest punch diameter used within a single product (in this explanation, the punch diameter is the same as P2), then move to point P5 of X2 and Y6 of product B.
Move to and perform round punching with the same punch diameter at point P2, and then press X3 on product B, point P6 at ¥7, x4 on product C,
Pre-punch is performed by moving in the order of point P7 of Y5. In this way, when the same punching instruction is given, punching is performed continuously in the order of products A, B, and C until the punching operation instruction is completed.

Further, when the punch diameter changes, the laser press machine automatically changes the punch diameter and continues punching products A, B, and C in that order. When all the specified punching is completed, product A is changed to product B according to the NC data.
, product C are laser-processed from pre-punch positions P4, P6, and P7 in this order as indicated by arrow Ql.

After the laser press processing (a series of operations of punching and laser processing) of products A, B, and C is completed, the processing position returns to the point P1 of X5 and Yl of the workpiece 7 according to the NC data instruction. This means that the laser press rod 3 returns by the amount of movement in the X-Y axis direction from the X5.71 point until the end of processing. Then, a cross mark is laser cut at the point P1 of the punching positions X5 and Yl by laser processing.

This allows the operator to visually check the misalignment between the punched hole drilled at point P1 at the start of machining and the cross mark laser cut at point P1 after the end of laser machining, and to It is determined whether a shift has occurred in the material 7.

As explained above, in the laser press processing machine, the processing order begins with punching, followed by fusing processing with a laser beam, and finally, the operator checks the positional deviation between the punched hole and the cross mark. It is scheduled to be held in Note that the blanking process shown in FIG. 10 is an example, and in reality punching and laser processing are often performed in a more complicated order, but basically the processing is performed in the above order.

<Problems to be Solved by the Invention> Conventionally, in order to detect the positional deviation of the workpiece 7 during laser press processing, punch holes drilled at the start of processing and cross marks laser cut after the processing is completed are used. Comparisons were made by visual inspection. However, the end face of the workpiece 7 may sag (or warp) due to vibration during punching or a decrease in the locking force of the workpiece 7 after punching as the laser brace rod 3 moves.
, the material 7 to be processed may come into contact with the main body of the laser press processing machine and be lifted from the reference plane E of the workpiece clamp 5, and there is a possibility that positional deviation may occur during processing. However, in the conventional operating method, the series of punching and laser processing operations continues unless an extremely special situation occurs, such as when the workpiece 7 comes off the claw of the workpiece clamp 5, so the process is not completed until all processing is completed. The punch holes and cross marks could not be confirmed. Therefore, there was a problem in that the processed material with the positional shift was processed as it was. It is also possible to cut the cross mark at the beginning of laser cutting, but in this case, the positional shift after cutting the cross mark, which is likely to occur, cannot be detected, making the mark cut meaningless. .

The present invention has been made in view of the above-mentioned circumstances, and provides an operating method for detecting material position deviation in laser press processing, which prevents the workpiece from being continuously processed when position deviation occurs during laser press processing. The purpose is to prevent the occurrence of defective products and improve work efficiency.

<Means for Solving the Problems> In order to achieve the above object, an operating method for detecting material position shift in laser press processing according to the present invention grips a plate-shaped workpiece with a work clamp, and An operating method for detecting a material position shift in laser press machining when moving the workpiece to perform a machining operation, the workpiece clamp being provided with a position of the workpiece immediately after the workpiece is gripped. The amount of device deviation (pressure) detected by the positional deviation detection device is used as a reference value, and the amount of positional deviation (voltage) during subsequent machining work is continuously monitored by the control means via the positional deviation detection device. The method is characterized in that when the amount of positional deviation (voltage) detected during the processing operation is outside a preset allowable range of positional deviation of the workpiece, it is determined as a positional deviation.

<Function> The position of the workpiece immediately after it is gripped by the workpiece clamp is determined by the positional deviation amount (voltage) in the positional deviation detection device.
The amount of positional deviation (voltage) of the workpiece is continuously monitored by the control means via the positional deviation detection device during processing work. The amount of positional deviation (voltage) detected during processing work is compared with the preset allowable positional deviation range of the processing material, and when the amount of positional deviation (voltage) from the positional deviation detection device is out of the allowable range, Misalignment of the processed material is determined.

<Embodiment> Hereinafter, a preferred embodiment of the operating method for detecting material position shift in laser press processing according to the present invention will be described in detail with reference to the drawings.

Figure 2 is a perspective view of a laser press processing machine in which the detection device is attached to the workpiece clamp of the laser press rod;
The figure shows a perspective view of the tolerance measuring instrument.
Components that are the same as those shown in Figure 0 are designated by the same reference numerals.
Duplicate explanations have been omitted.

A pair of positional deviation detection devices 11a, 11b are attached to the left and right sides of the workpiece clamps 5 at both ends to detect the positional deviation of the workpiece 7, and the positional deviation detection devices 11a, llb
are attached to both ends of the workpiece clamp 5 so that detection of positional deviation can be performed optimally. A pair of controllers 13a and 13b are attached to the laser press rod 3, and the controllers 13a and 13b operate in pairs with the displacement sensors incorporated in the detection devices 11a and Ilb, and convert the amount of displacement from the displacement sensors into voltage. In this embodiment, the left and right positional deviation detection devices 11a and 11b and the controllers 13a and 13b each independently operate a tolerance measuring device 1 which is a control means, as shown in FIG.
5. The tolerance measuring device 15 measures the processing material 7 with respect to the initial displacement voltage from the controller 13a113b.
Controller 1 when set to work clamp 5
The difference between the reference displacement voltage from controllers 13a and 13b and the displacement voltage from controllers 13a and 13b when a positional deviation occurs is further compared with the deviation amount value (pressure) within the error tolerance range, and the position is determined. This is a measuring device that outputs deviation error information.

This tolerance measuring device 15 allows the operator to freely specify the deviation amount (voltage) within the material position deviation error tolerance range. Moreover, it is also possible to use a commercially available one as this tolerance measuring device 15.

Next, based on FIG.
b will be explained in more detail.

FIG. 4 shows a side sectional view of the positional deviation detection device.

A detection head bracket (B/K) 17 is attached to the work clamp 5 provided on the laser brace rod 3, and a positional deviation detection device 11a is attached to the detection head bracket (B/K) 17.
(llb) is attached. Detection Rad B/Ni 1
A block 19 of a positional deviation detection device F11a (1lb) is attached to 7, and a slide shaft 21 is slidably inserted into the block 19. A bushing flange 23 is coupled to the outer end of the slide shaft 21. The slide shaft 21 and the bushing flange 23 are biased in the direction of the workpiece 7 (in the direction of arrow R) by a compression spring 25 installed inside the block 19, and the housing 27
serves as a stopper. A displacement sensor 29 is disposed coaxially with the slide shaft 21 in the block 19, and the displacement sensor 29 is connected to the block 19 through a sensor mounting plate 31.
It is fixed to the rear end of the The displacement sensor 29 detects the distance from the slide shaft 21 and accurately outputs the amount of displacement. The displacement sensor 29 is arranged through a nut plate 33 so that adjustment with the sensor mounting plate 31 does not deviate. A connection cord 35 is connected to the displacement sensor 29, and information from the displacement sensor 29 is inputted to each controller 13a, 13b (see FIG. 2) via the connection cord 35.

FIG. 5 is a block detection diagram of the control section used in the present invention.

The control unit includes a CPU 37, a ROM 39 that controls according to the flowchart shown in FIG. 1, a memory (RAM) 41 for storing the operating status of the laser press processing machine and the tolerance measuring device 15, and data for operation instructions, and a laser press processing machine. It is detected from the timer 43 that monitors the operation confirmation state in response to operation instructions, the parallel l1045 that controls the exchange of signals from the laser press processing machine and the tolerance measuring device 15, the serial l1047 that controls the interface with external equipment, etc. .

FIG. 6 is a sectional view showing a state in which the workpiece is set on the reference surface of the workpiece clamp of the laser press processing machine.

A workpiece 7 is gripped by the workpiece clamp 5, and an end of the workpiece 7 is in contact with a reference surface E of the workpiece clamp 5. The bushing flange 23 of the positional deviation detection device 11a (llb) is simultaneously brought into contact with the end of the workpiece 7 that is in contact with the reference surface E, and the bushing flange 23 is pressed in the direction of arrow S by the workpiece 7. It is in a state of being When the bushing flange 23 is pressed against the workpiece 7, the slide shaft 21 coupled to the bushing flange 23
is moved in the direction of the displacement sensor 29, and the moved slide shaft 21 is adjusted so as to stop at a distance of about 1 kakukaku from the displacement sensor (see part F in FIG. 6).

FIG. 7 shows a cross-sectional view showing the state of movement of the slide shaft in the positional deviation detection device.

FIG. 7 shows a state in which the end surface of the slide shaft 21 has moved from point B to point A. The slide shaft 21 moves left and right with respect to point A, and the distance between the displacement sensor 29 and the slide shaft 21 changes due to the movement. Displacement sensor 2
9 detects the amount of change in this distance as the amount of deviation (voltage) of the workpiece 7 from the reference plane E. For example, slide shaft 2
When 1 moves from point A in the direction of right arrow T, it is defined as + change, and conversely, when it moves in the direction of left arrow U, it is defined as monocarbonization. Slide shaft 2 connected to bush flange 23
1 and the tip of the displacement sensor 29 have a precise structure so that the amount of change in distance is directly proportional and detected by voltage.

Further, when carrying out the present invention, the processing material 7 is
As shown in the figure, it is assumed that the workpiece is set at a predetermined position on the reference plane E of the workpiece clamp 5 of the laser press processing machine using a robot hand or the like, and that processing can be performed at any time according to a laser press processing instruction.

Next, an operating method for detecting material position deviation in laser press processing according to the present invention will be explained based on FIG.

FIG. 1 shows a flowchart representing an operating method for detecting material positional deviation.

First, a processing instruction is given to the laser press processing machine by the aforementioned control section (see block 51 in FIG. 1. Hereinafter, only the reference numerals attached to the blocks to be referred to will be described). Then, the laser press processing machine starts processing according to instructions from the stored NC data.

Next, the above-mentioned control section sends an auto-zero signal to the tolerance measuring instrument 15 shown in FIG. do. Due to the sent auto-zero signal, the voltage corresponding to the distance between the displacement sensor 29 of the positional deviation detection device xla (llb) and the slide shaft 21 at point A in Fig. 7 becomes the reference displacement voltage, and that position becomes the reference value for future positional deviations. Become.

The process of 90° reversal processing is controlled so that the processing of the laser press processing machine is temporarily stopped midway through the creation of the NC data, and the work clamp 5 is automatically opened (55.
57) If the machine does not stop at - or if it stops at - but the work clamp 5 is closed, the 90° reversal process is not executed and the control is changed to positional deviation determination process.

When it is determined that 90° reversal processing is to be performed, the process waits until the work clamp 5 is closed (59).

That is, at that point, the operator intervenes, turns the workpiece 7 again by 90 degrees, sets the workpiece 7 on the reference plane of the workpiece clamp 5, and issues an operation instruction using the start operation switch (not shown). When an operation instruction is issued, the operation of the NC data is started, the temporary stop function is canceled, the workpiece clamp 5 is closed, and normal machining is started. The aforementioned control section determines that the 90° reversal process has been executed, and sends the auto-zero signal again to the tolerance measuring device 15 in FIG. 3 (61).

The re-sent auto-zero signal causes the point A in FIG. 7, that is, the displacement sensor 2 of the positional deviation detection device 11a (llb)
The voltage corresponding to the distance between 9 and the slide shaft 21 becomes the reference displacement voltage, and the value 1 becomes the reference value for future positional deviation.

While the laser press processing machine performs processing in the order of punching and laser processing according to the instructions of NC data, the positional deviation detection device 11a
The distance between the displacement sensor 29 (11b) and the slide shaft 2 changes every moment. The detection device 11a (llb) constantly inputs the constantly changing positional displacement voltage to the tolerance measuring device 15.

During the processing work of the laser press machine, the detection device 1
If the voltage from 1a (llb) exceeds the permissible range of positional deviation amount (voltage) set in advance by the tolerance measuring device 15,
Positional deviation error information is output from the tolerance measuring device 15 (63)
. In this case, if the amount of positional deviation is within the allowable range,
Continue to perform normal operations. Further, if the work clamp 5 is open when a positional deviation error is detected, it is determined that an instruction to invert the workpiece by 90 degrees has been generated, and the normal operation is executed as is (65).

Only when a positional deviation error is detected and the work clamp 5 is closed, it is determined that an original material positional deviation error has occurred. In this case, a stop instruction is sent to the laser press processing machine (67). At the same time, an error message indicating that a positional shift has occurred is displayed on the display section of the control section (69).

Thereafter, the processing depends on the operator's judgment, but it is necessary to change the NC data control sequence of the laser press machine only if the processing is to be stopped at that point. In either case of cancellation or continuation, to cancel the error, the stop of the laser press processing machine is canceled by pressing the error cancellation button (71) of the control section described above (73).

After that, an auto-zero signal is immediately sent to the tolerance measuring device 15 (75). In other words, the auto-zero signal resets the reference displacement voltage and position error information when a material misalignment occurs, and the current point A is newly set. (7th
(see figure) becomes the reference displacement voltage, and that position becomes the reference value for future positional deviations.

After the new positional deviation reference value is reset, a new processing instruction is given to the laser press machine (77). Not only when the laser press machine stops or continues operation due to a new processing instruction,
9 until the processing end code (79) of the NC data is detected.
0' inversion processing and positional deviation error detection are repeated.

Although the above description has been made regarding the positional deviation detection devices 11,
By monitoring a plurality of positional deviation detection devices 11a and llb in parallel (in the embodiment, two of them, lla and llb), it is possible to activate an error in any one of the positional deviation detection devices 11a and llb. Positional deviations can be detected precisely.

<Effects of the Invention> As explained above, according to the operating method for detecting material positional deviation in laser pre-processing according to the present invention, the permissible positional deviation range of the processed material is set in advance, and the positional deviation detection device detects the positional deviation during processing work. The amount of device deviation (voltage) detected is compared with the permissible positional deviation range, and when the amount of positional deviation (voltage) is outside the permissible range, it is determined to be a positional deviation error of the processed material. Even when this occurs, the material to be processed will not continue to be processed. As a result, it is possible to quickly respond to material misalignment during processing, prevent the production of defective products, and prevent unnecessary processing (and improve work efficiency).

[Brief explanation of drawings]

Fig. 1 is a flowchart showing the operating method for detecting material position deviation, Fig. 2 is a perspective view showing a laser press processing machine in which a detection device is attached to the work clamp of the laser press rod, and Fig. 3 is a tolerance measurement. FIG. 4 is a side sectional view of the positional deviation detection device, FIG. 5 is a block detection diagram of the control unit used in the present invention, and FIG. Fig. 7 is a cross-sectional view showing the state of movement of the slide shaft in the positional deviation detection device; Fig. 8 is a cross-sectional view showing the positioning device in the laser press machine. A perspective view showing the state in which the workpiece clamp grips the workpiece and the workpiece is processed by the laser press machine. Figure 9 is an enlarged view of section D in Figure 8. Figure 10 is the laser press machine. It is an explanatory view showing an example of blanking processing in a press processing machine. 5... Work clamp, 7... Processing material. 11a, llb...positional deviation detection device. 15... Tolerance measuring device (control means). Patent applicant Oki Electric Industry Co., Ltd. Agent
Patent Attorney Kuninori Funabashi Figure 2 Figure 3 Figure 5 Figure 9 Figure 10

Claims (1)

[Scope of Claims] An operating method for detecting a material position shift in laser press processing when a plate-shaped workpiece is held by a work clamp and the workpiece is moved via the workpiece clamp to perform the work. The position of the workpiece immediately after the workpiece is gripped is used as a reference value for the amount of positional deviation (voltage) detected by the positional deviation detection device provided on the workpiece clamp, and is The amount of positional deviation (voltage) is continuously monitored by the control means via the positional deviation detection device, and the amount of positional deviation (voltage) detected during the processing operation is outside the preset allowable range of positional deviation of the processed material. An operating method for detecting material positional deviation in laser press processing, characterized in that a positional deviation is determined when the material position shifts.