JP3318875B2 - Processing part correction processing method of processing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for correcting a processing portion of a processing machine.

[0002]

2. Description of the Related Art Conventionally, a boring machine as shown in FIG. 5 is generally known. This processing machine 1 includes a plurality of cutting tools (processing portions) 3 projecting in the radial direction at the tip of a processing shaft 2.
a to 3d are attached. The machining axis 2
Is a part to be processed 5a of the work 4 which is rotatable around an axis.
It is provided movably on the .about.5d side. Each of the cutting tools 3a to 3d is provided with a corresponding one of the processed parts 5a to 5d.
d is processed. In order to perform boring of the processed parts 5a to 5d of the work 4 by such a processing machine 1, the bobbin 3 is moved to the processed parts 5a to 5d side while rotating the processing shaft 2, and cut at the tips of the cutting tools 3a to 3d. . Here, although the cutting tools 3a to 3d are formed of a hard material, they wear due to multiple use. Therefore, it is necessary to correct the cutting tools 3a to 3d so that the processed parts 5a to 5d of the work 4 are always finished to appropriate dimensions. In the correction process, when the machining axis 2 is pulled out from the work 4, the tool 3 is connected to the rear end of the bits 3a to 3d, and the bits 3a to 3d are driven by a pulse motor or the like.
This is performed by further projecting from the outer peripheral surface of. The amount of protrusion is a fixed amount set in advance.

FIG. 6 shows a state in which the workpiece 4 is transported. The measuring machine 7 is adjacent to the processing machine 1 and the workpiece 4 is moved.
Is placed on the conveyor 8 and the measuring machine 7
Transported to the side. That is, the workpiece 4 processed at the processing station 9 of the processing machine 1 is transported by the conveyor 8 to the measuring station 11 of the measuring machine 7 via the idler station 10. In the idler station 10 between the processing station 9 and the measurement station 11, there is a workpiece 4 which has finished processing and is waiting for measurement. In the example shown in FIG. 6, there are three idler workpieces 4. In the measuring station 11, the measuring device 7 measures the inner diameter of each of the processed parts 5a to 5d of the workpiece 4, and when it is determined by the control device (not shown) that the correction processing of the cutting tools 3a to 3d is necessary, Correction signal 12 for processing machine 1
Is output, processing is stopped, and correction processing is performed.

Conventionally, when the correction signal 12 is output, it is set as shown in FIG. In FIG. 7, an area in the center is a correction unnecessary area 13, and the bytes 3a to 3a are not required.
3d is an area in which an extremely good processed product is obtained without being worn until the correction processing is required. In addition, above and below the correction unnecessary area 13, the obtained processed product can be used as a product, but correction necessary areas (-OK, + OK) 14, 15 which need to correct the bytes 3a to 3d are required. Is provided. Upper correction required area (-OK) 14
Is an area that needs to be corrected mainly due to wear of the cutting tools 3a to 3d.
Is in a state where the amount of protrusion of the cutting tools 3a to 3d is insufficient. On the other hand, the lower correction required area (+ OK) 15
Is an area that needs to be corrected due to an abnormal mounting of the cutting tools 3a to 3d, and when the measurement data is in the correction necessary area 15, the cutting tools 3a to 3d are in a state of excessive protrusion. Furthermore, above and below the correction required areas 14 and 15,
Defective regions (-NG, + NG) 16 and 17 are provided. When the measurement data is in these defective areas 16 and 17, the obtained processed product cannot be used as a product.

At the start of machining, if there is no abnormal mounting of the cutting tools 3a to 3d, etc., and the measurement is normal, the measured data (shown by a plot in FIG. 7) is in the correction unnecessary area 13. However, when machining is performed a number of times, the cutting tools 3a to 3d gradually wear, and as the inside diameter of the workpieces 5a to 5d of the work 4 decreases, the measurement data gradually approaches the upper correction required area 14.

Heretofore, conventionally, as shown by reference numeral 18 in FIG. 7, a correction signal 12 caused by wear of the cutting tools 3a to 3d has three points (the number of points (The setting is optional) It was set to output when entering. Then, for example, when the correction signal 12 is output only for a certain byte 3a, the other byte 3b
No correction processing is performed for the elements 3 to 3d, only the cutting tool 3a is corrected, and the process is shifted to the machining process again.

[0007]

However, as described above, the correction signal 12 is output only when the actual measured data after processing always enters the correction required area 14 at three consecutive points. Then, the timing of the correction processing may be delayed. That is, due to variations in accuracy of the processing machine 1 and the measuring machine 7, variations also occur in the measurement data. Therefore, in spite of the fact that the time to perform the correction processing has already arrived, the measurement data may not continuously enter the correction required area 14 and the correction signal 12 may not be output. As a result, the number of processed products having slightly lower processing accuracy (measured data is in the correction required area 14) is increased, and processed products (measured data are in the defective area 16) that cannot be used as a product. Sometimes it occurred.

This is also due to the fact that the idler station 10 exists between the processing station 9 and the measuring station 11. That is, even when the variation of the measurement data is small, as shown in FIGS. 6 and 7, when the measurement data continuously enters three points in the correction required area 14, the measurement standby 3 which has already finished the processing is completed. The works 4 exist in the idler station 10. Therefore, even if the correction signal 12 is output, the bytes 4a to 3b before the correction process are applied to the three idler workpieces 4.
In some cases, the workpiece is processed with d, and the processing accuracy is slightly lower, resulting in a processed product that cannot be used as a product.

On the other hand, in order to prevent the above-described delay in the correction processing, a lower limit value line 19 (see FIG.
), And the correction required area 14 is expanded to increase the correction signal 1.
2 may be set so as to be output earlier.
However, in consideration of the variation of the measurement data and the existence of the idler work 4, the lower limit value line 19 must be set to be considerably low in order to surely prevent the delay of the correction processing. In this case, the output of the correction signal 12 may be too early, and the number of correction processes increases. When the number of times of the correction processing increases, a processed product of an appropriate size can always be obtained, but the time required for the correction processing operation becomes unnecessarily long, and there has been a problem that the production efficiency is significantly reduced.

Further, when the correction signal 12 is output only for a certain byte 3a, even if the correction process for the other bytes 3b to 3d occurs immediately thereafter, the processing is performed by the other bytes 3b to 3d. Each processed part 5b
When the measurement data of .about.5d is not in the correction required area 14, only the byte 3a was corrected, so that the number of times of correction processing was significantly increased, and the production efficiency was extremely poor.

The present invention has been made in view of such a conventional problem, and provides a method of correcting a processed portion of a processing machine which can always obtain a processed product having an appropriate size and has high production efficiency. The purpose is to:

[0012]

In order to solve the above-mentioned problems, according to the present invention, after a workpiece having a plurality of workpieces is processed by a processing machine having a processing section corresponding to each of the workpieces, In measuring the processing state of the work and correcting the processing part of the processing machine based on the measured data, for each processed part, its displacement characteristic is obtained from a plurality of preceding latest and continuously measured data obtained continuously. determined, the prediction of the respective workpiece portions of the workpiece to be continued after-out based, the displacement characteristics
Calculates the prediction data that is the measurement result, and when the prediction data for a certain workpiece reaches the correction required area,
Outputs a correction signal for the processed part that processes the processed part
In and correction process, and the time, even with the entire processing unit in which the predictive data is processed and another portion to be processed has been reached the correct staging area is a stage before the correction necessary area, the compensation signal and output, it was decided to compensation processing.

[0013]

In the correction processing method having the above-mentioned structure, the displacement characteristic (average straight line) of each processed part is statistically obtained from the latest latest and plurality of measurement data obtained continuously. Data variations are averaged. Then, a correction signal is output when not the actual measurement data but the prediction data for a certain workpiece predicted based on the displacement characteristics reaches the correction required area. At this time, if the prediction data for the other processed part has reached the correction preparation area, a correction signal is simultaneously output to the processing part for processing the processed part in that part, and the correction signal is output. The correction processing is simultaneously performed on all the output processed parts. Therefore, the correction process can be performed at an appropriate time without fail, and the number of correction processes can be reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 4 is a block diagram of the correction processing device used in the present embodiment. The correction processing device includes the processing machine 1, the measuring machine 7, and the control device 20. The processor 21 of the control device 20 has an input / output interface 2
The processing machine 1 and the measuring machine 7 are connected to each other via the second processing machine 2.
The processor 21 performs data processing such as obtaining displacement characteristics of measurement data, and has a memory 23 for storing programs and various data. Further, the processor 21 is connected with a CRT 24 for displaying a graph in which measurement data is plotted, and a keyboard 25 for inputting set values and the like.

Next, the procedure of the correction process according to this embodiment will be described with reference to FIGS. That is, FIGS. 1 and 2 show the processing procedure of the processor 21, and the processing is started when the boring processing by the processing machine 1 is started. First, the work 4 processed is the measuring station 1
After being conveyed to 1, the inside diameter of each hole is measured by the measuring device 7, and the measurement data is read as shown in FIG. 3 (step 26). Then, the number of the read measurement data is the number (for example, five) necessary for obtaining the average straight line (displacement characteristic) by the statistical processing of the measurement data, that is, the correction that can effectively determine whether the correction processing is necessary or not. It is determined whether or not the number of valid data has been read (step 27). If the number of corrected valid data is insufficient (NO in step 27), step 26 is repeated.
On the other hand, when the number of correction effective data reaches a predetermined number (step 2).
Then, the average straight line, that is, the displacement characteristic is obtained by statistical processing from the latest n pieces of measurement data in the correction effective data (step 28). Here, the number of measurement data (n pieces) for obtaining the average straight line is limited to, for example, 20 pieces. At the beginning of processing when the number of measurement data pieces is less than 20, an average straight line is obtained from the number of measurement data pieces obtained up to that time. .
However, the minimum correction effective data number (5) is required.
In addition, the latest latest data obtained continuously is used as the 20 measurement data. FIG. 3 shows two workpieces 5
In the graph plotting each measurement data for a and 5b, M indicates an average straight line. A plot indicated by a white circle indicates predicted data of the work 4 in the idler station 10.

When the average straight line M is obtained, it is determined whether or not the slope K of the average straight line M is outside a preset limit (step 29). (YES at S29), after an alarm is output mainly indicating that the wear condition of the cutting tool 3 is abnormal (step 3).
1) If it is determined that the slope K is within the limit (NO in step 29), the variation width L of each measurement data is obtained (step 30). The variation width L is a vertical distance from the average straight line M in each measurement data used for obtaining the average straight line M, and when the variation width L of certain measurement data exceeds a set limit value (step (YES at 30), after an alarm signal is output mainly assuming that the cutting tool 3 is abnormally attached (step 32), and when the variation width L does not exceed the limit value (step 32). NO) Proceed to the next as it is.

Based on the average straight line M, the transport speed of the workpiece 4 transported at a constant speed, and the number of idler workpieces 4 present in the idler station 10,
At that time, the prediction data of the following work 4 which is in the processing station 9 and is not yet measured by the measuring machine 7 is calculated (step 33). That is, the processing accuracy of the processed parts 5a to 5d of the work 4 of the processing station 9, that is, when the work 4 is conveyed to the measuring station 11, the processed parts 5a to 5d of the work 4 are processed. It is predicted how much measurement data is obtained in 5d.

Thereafter, it is determined whether or not the predicted data of the workpiece 4 in the processing station 9 reaches the correction required area 14 beyond the lower limit line 19 (correction limit value) of the correction required area 14 in FIG. A determination is made (step 34). Here, when it is determined that the prediction data does not exceed the lower limit value line 19 (N in step 34).
O), the process returns to step 26 and reading of the measurement data is continued. On the other hand, when it is determined that the prediction data exceeds the lower limit value line 19 (YES in step 34), the correction amounts of the bytes 3a to 3d are calculated (step 3).
5) The correction amount is stored (step 36). In FIG. 3, H indicates a correction amount, and the correction amount H is a byte 3a to 3a.
The prediction data is added and determined by the amount exceeding the lower limit value line 19 so that the projection amount of 3d becomes the initial value. FIG. 3 shows an example of a case where the predicted data reaches the correction required area 14 for the processed portion 5a of the work 4. That is, the correction amount H is calculated and stored only for the byte 3a. Steps 26 to 36 described above are performed for each of the processed parts 5a to 5d of the work 4.

Thereafter, as shown in FIG. 1, the above-mentioned steps 26 to 36 are carried out for all the correction points (each of the workpieces 5a to 5).
It is determined whether or not d) has been processed (step 3).
7) If there is an unprocessed part (N in step 37)
O) Steps 26 to 36 are repeated until the processing for all correction points is completed. All processed parts 5a ~
When steps 26 to 36 are completed for 5d (YES in step 37), it is determined whether or not the correction amount H is stored for any of the bytes 3a to 3d (step 38). When the correction amount H is not stored for any of the bytes 3a to 3d, steps 26 to 36 are repeated for all the processed parts 5a to 5d.

On the other hand, if the correction amount H has been stored for any of the bytes 3a to 3d (Y in step 38).
ES), the prediction data for the processed parts 5a to 5d to be processed by the other bytes 3a to 3d are stored in the correction preparation area 14a.
(See FIG. 3) is determined (step 39). In the example shown in FIG. 3, the prediction data for the processed portion 5a has reached the correction required area 14, and the predicted data for the processed portion 5b is in the correction preparation area 14a.
Has been reached. As shown in FIG.
a has been reached (YE in step 39).
S) For the processed portion 5b, the correction amount h of the corresponding cutting tool 3b is calculated (Step 40), and the correction amount h is stored (Step 41). This correction amount h is byte 3
The prediction data is subtracted and determined by the amount not reaching the lower limit value line 19 so that the protrusion amount of b becomes the initial value. On the other hand, for the processed parts 5c and 5d for which it has been determined that the prediction data has not reached the correction preparation area 14a (NO in step 39), the correction amount h is not calculated or stored.

In step 42, step 3
4 for all the processed parts 5b to 5d other than those for which it is determined that the prediction data has reached the correction required area 14.
It is determined whether or not steps 39 to 41 have been processed.
When it is determined that the processing has not been completed for any of the processed parts 5b to 5d (NO in step 42), the above steps 39 to 41 are performed until all the processing is completed. On the other hand, when it is determined that the processing has been completed for all the processed parts 5b to 5d (YES in step 42), the correction signal 12 is output (step 43). At this time, the correction signal 12 is the byte 3a of the byte in which the prediction data is determined to have reached the correction required area 14 in step 34.
In step 39, the prediction data is stored in the correction preparation area 1
The byte 3b, which has been determined to have reached 4a, is output simultaneously. After the correction signal 12 is output, the machining is temporarily stopped, and the byte correction device 6 performs a predetermined correction process on the bits 3a and 3b. After the correction processing, the processing is started again, and the correction processing procedure shown in FIGS. 1 and 2 is repeated.

As described above, according to the present embodiment, the average straight line M is statistically obtained from the latest and most recent actual measurement data, so that the dispersion of the measurement data is averaged. Then, based on the average straight line M, the workpieces 5 a to 5 having the workpiece 4 in the machining station 9 predicted.
The correction signal 12 is output when the prediction data for d exceeds the lower limit value line 19 of the correction required area 14. At this time, if the prediction data for the other processed parts 5a to 5d has reached the correction preparation area 14a, the correction signals 12 are simultaneously transmitted to the bytes 3a to 3d corresponding to the processed parts 5a to 5d. Is output, and the correction process is simultaneously performed on all the bytes 3a to 3d from which the correction signal 12 has been output. Further, the correction amounts H and h are calculated by the bytes 3a.
It is calculated so that the protrusion amount of 3d becomes the initial value. Therefore, variations in measurement data and idler work 4
, The delay of the correction timing due to the presence of the correction is eliminated, and the correction processing by the appropriate correction amounts H and h is surely performed at the appropriate timing. I
If the predicted data reaches the correction required area 14
Not only the bytes 3a to 3d corresponding to the parts 5a to 5d,
Workpiece 5 whose predicted data has reached correction preparation area 14a
Bytes 3a to 3d corresponding to a to 5d
By performing the correction processing, the correction in the processing machine 1 is performed.
Low number of treatments and good production efficiency.

[0023]

As described above, according to the correction processing method of the present invention, the displacement characteristic of each of the processed parts is obtained from the latest latest and plural actual measurement data obtained continuously. At the time when the prediction data for a certain processing part reaches the correction required area, if the prediction data for the other processing parts has reached the correction preparation area, all the processing parts corresponding to those processing parts are simultaneously processed. Since the correction processing is performed by outputting the correction signal, the correction processing can be performed at an appropriate time, and as a result, a processed product having an appropriate size can be always obtained . Furthermore, the number of correction processes is reduced,
It is also possible to improve production efficiency.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating a correction processing procedure according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating a correction processing procedure of the embodiment.

FIG. 3 is a graph showing measurement data and the like of the embodiment.

FIG. 4 is a block diagram showing a correction processing device used in the embodiment.

FIG. 5 is a schematic configuration diagram illustrating a processing and correction processing state of a processing unit in the processing machine.

FIG. 6 is a plan view showing a transfer state of a work.

FIG. 7 is a graph displaying measurement data and the like of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Processing machine 3a-3d Byte (processing part) 4 Work 5a-5d Worked part 6 Byte correction device 7 Measuring machine 9 Processing station 10 Idler station 11 Measurement station 12 Correction signal 13 No correction required area 14a Correction preparation area 14, 15 Correction Required area 16, 17 Defective area 19 Lower limit line 20 Controller M Average straight line

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Atsuhiko Hayakawa 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Co., Ltd. (56) References JP-A-59-93255 (JP, A) 22472 (JP, B2) JP-B-56-28650 (JP, B2) (58) Field surveyed (Int. Cl. ⁷ , DB name) B23Q 15/04 G05B 19/404

Claims (1)

(57) [Claims] After a workpiece having a plurality of workpieces is machined by a machining machine having machining sections corresponding to the respective machining sections, a machining state of the workpiece is measured, and machining of the machining machine is performed based on the measured data. Upon part to the correction process, for each of the processing portions, the displacement characteristics obtained from the latest and the plurality of measurement data preceding obtained continuously-out group <br/> Dzu the displacement characteristics, to continue after the workpiece Predicted in each processed part of
Calculating a predicted data as a measurement result, when the prediction data for the work unit reaches the correction required region, the
A correction signal is output for the processing part that processes the
And correction process, and at that point, even with the entire processing unit in which the predictive data is processed and another portion to be processed has been reached the correct staging area is a stage before the correction necessary area, it outputs a compensation signal and, compensation processing processing unit correction method processing machine, characterized by.