JPH06143104A - Rework controller in fms - Google Patents

Abstract

PURPOSE:To improve efficiency of the operation of an FMS after work abnormality is generated and after rework is started in a rework controller in the FMS. CONSTITUTION:An abnormality detecting means A4 detects any abnormal workpiece when work abnormality is generated in a work station. A work interruption means A5 interrupts the work of the abnormal workpiece and conveys it to a pallet pool station from the work station in which work abnormality is generated. A rework means A6 conveys the abnormal workpiece to the pallet station from the pallet pool station according to the instruction of a worker, and has the reworking process from a fixed work station carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of processing stations including a numerically controlled machine tool, a pallet loading / unloading device, a work transfer device, a pallet pool station (warehouse), and setup (loading, unloading).
FMS (Flexible Manufacturing System) consisting of stations and central processing unit that controls them
), The present invention relates to a re-machining control device for controlling re-machining of a workpiece in which a machining abnormality has occurred.

[0002]

2. Description of the Related Art In an FMS, pallets can be randomly transferred between a plurality of processing stations, a pallet pool station and a setup station. FIG. 11 is a diagram showing a configuration example of a general FMS,
The instruction to set the workpiece is sent from the central processing unit 1 to the operation panel 3 equipped with the work instruction CRT via the interface 2 and displayed, and the jig or pallet P required for the workpiece is transferred on the transfer line 8. (Palleting) from the pallet pool station 9 along with the carriage 7
The transfer instruction to transfer to the station 4 is the central processing unit 1
Is sent to the transfer control device 6 via the interface 5. When the jig or pallet P is conveyed to the setup station 4, the worker who sees the display of the set instruction attaches the workpiece to the pallet P. Then, the pallet P to which the workpiece is attached is transferred from the setup station 4 via the transfer carriage 7 to a predetermined pallet pool station 9 or processing station ST (i) (i =
A transport command for transporting the pallet loading / unloading device 10 (i) of 1, 2, ..., N) is sent from the central processing unit 1 to the transport control device 6 via the interface 5.

The pallet P to which the workpiece is attached is the pallet loading / unloading device 10 of the processing station ST (i).
After being conveyed to (i), the machining command of the workpiece is sent from the central processing unit 1 to the numerical controller 12 (i) of the machining station ST (i) via the interface 11. Then, the numerical control device 12 that has received the machining command
(I) takes out the pallet in the machine tool MT (i) to the carry-out side of the pallet carry-in / carry-out device 10 (i), draws the carry-in side pallet P into the machine tool MT (i), and performs the machining cycle. Run. After the machining cycle is completed, a machining cycle completion signal is sent from the numerical controller 12 (i) to the interface 1
When it is sent to the central processing unit 1 via 1, the central processing unit 1 determines whether or not there is a next step of the workpiece for which the machining cycle has been completed.

If there is a next process, the pallet P with the workpiece attached thereto is carried in from the pallet carry-in / carry-out device 10 (i) via the carriage 7 to the palletizing station ST (i + 1) for carrying out the machining cycle of the next process. Unloading device 10
A transport command for transporting to (i + 1) is sent from the central processing unit 1 to the transport control device 6 via the interface 5. If there is no next process, the central processing unit 1 issues a transfer command to transfer the pallet P to which the workpiece is attached from the pallet loading / unloading device 10 (i) to the predetermined pallet pool station 9 via the transfer carriage 7. It is sent to the transfer control device 6 via the face 5. The instruction to collect the work is sent from the central processing unit 1 to the operation panel 3 equipped with the work instruction CRT via the interface 2 and displayed, and the pallet P on which the work is attached is sent from the pallet pool station 9. A transport command for transporting to the setup (unloading) station 13 via the transport vehicle 7 is sent from the central processing unit 1 to the transport control device 6 via the interface 5. And the pallet P
When is transferred to the setup station 13, the worker who sees the display of the recovery instruction removes the workpiece from the pallet P.

In such a structure, when a machining abnormality occurs during execution of a machining cycle at a certain machining station, the machining cycle is interrupted and the workpiece is machined to execute the machining cycles of the next and subsequent steps. The workpieces are sequentially conveyed to the stations, but each time they are conveyed, a machining cycle stop signal is sent to the machining station to simply pass the workpiece without executing each machining cycle, and finally to the pallet pool station. Then, if re-machining becomes possible after that, the workpieces are sequentially transported from the machining station that executes the first machining cycle, but a machining cycle stop signal is sent to the machining stations before the machining station where the machining abnormality occurs each time the machine is transported. Is sent, the workpiece is simply passed through without executing each machining cycle that has already been machined, and the machining cycle is executed at the machining station after the machining station where the machining abnormality occurs.

FIG. 12 is a block diagram showing an example of a conventional rework control device in an FMS, and FIG. 13 is a flowchart explaining an example of its operation. When a machining abnormality occurs during machining of a workpiece at the machining station, the abnormality detecting means A1 detects the workpiece and the machining station where the machining abnormality occurs (step S1). Then, the machining bypass means A2 sends a machining cycle stop signal to the machining station each time the workpiece is conveyed to the next machining station (step S2). Then, when the processing abnormality is resolved and the reprocessing becomes possible, the reprocessing bypass means A3
Transports the workpieces sequentially from the first processing station,
It is determined whether or not the machining station to which the workpiece is conveyed is before the machining station where the machining abnormality has occurred (step S3), and if it is after the machining station where the machining abnormality has occurred, the machining cycle of the process is executed. (Step S4), if it is before the machining station where the machining abnormality occurs, a machining cycle stop signal is sent (step S4).
5) When all processing cycles are completed, all processing is completed.

[0007]

DISCLOSURE OF THE INVENTION The conventional FMS described above
In the re-machining control device in the above, if there is a process after the process in which the machining abnormality occurs, the workpiece has to be once transported to each machining station in the subsequent process, and the machining abnormality occurs during re-machining. The workpiece has to be once transported to each processing station in the process prior to the process, and there is a disadvantage in that there are many unnecessary operations. The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a reworking control device for an FMS that can improve the efficiency of the operation of the FMS after the occurrence of a working error and after the start of reworking. Especially.

[0008]

SUMMARY OF THE INVENTION The present invention is an FMS for transporting and processing a workpiece between a plurality of processing stations, a pallet pool station and a setup station.
The above-mentioned object of the present invention is to detect an abnormal workpiece when a processing abnormality occurs at the processing station, and to interrupt the processing of the abnormal workpiece. Machining interruption means for transporting the abnormal workpiece from the machining station where the machining abnormality has occurred to the pallet pool station, and transporting the abnormal workpiece from the pallet pool station to the setup station according to an instruction from an operator. Reprocessing means for performing the reprocessing from the processing station.

[0009]

According to the present invention, the abnormal work which has become a machining abnormality is once conveyed to the pallet pool station, so that the execution of the post-process of the abnormal work is suspended, and the desired process is judged by the operator. Since the rework can be performed, useless operation can be omitted.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an example of a rework control device in an FMS of the present invention, and FIGS. 2 and 3 are flow charts for explaining an example of its operation. Here, the external storage device 14 of the central processing unit 1 used in the device of the present invention.
The data formed in the above will be described. FIG. 4 shows the production plan data B in which the part information of each workpiece to be machined is registered.
1, FIG. 5 is the machining process data B2 in which the machining process of each workpiece is registered, FIG. 6 is the set instruction data B3 in which the information of the workpiece that can be put into the setup station 4 is registered, and FIG. Processing progress data B4 for managing the processing progress,
FIG. 8 shows machining schedule data B5 for registering the workpiece set at the setup station 4, and FIG. 9 shows recovery instruction data B6 for registering information on the workpiece that can be recovered at the setup station 13. FIG. 10 is a relational diagram of these data, and the central processing unit 1 creates set instruction data B3 and machining progress data B4 from the production plan data B1 and the machining process data B2. At this time, the machining progress data B4
Has been initialized and the progress information has not been set.

The central processing unit 1 sends a set instruction of the workpiece to the operation panel 3 equipped with the work instruction CRT via the interface 2 and displays it, and also conveys a jig or pallet P required for the workpiece. A transport command for transporting from the pallet pool station 9 along the line 8 to the setup station 4 via the transport vehicle 7 is sent to the transport control device 6 via the interface 5. When the jig or pallet P is conveyed to the setup station 4, the worker who sees the display of the set instruction attaches the workpiece to the pallet P, and the work instruction CR
Press the set complete button on the control panel 3 equipped with T. Upon completion of this setting, the central processing unit 1 creates the machining schedule data B5, and the machining progress data B4 of the corresponding workpiece.
Setting completion "S" is registered in the transfer control device via the interface 5 to transfer a transfer instruction for transferring the pallet P to which the workpiece is attached from the setup station 4 to the predetermined pallet pool station 9 via the transfer carriage 7. Send to 6.

When the pallet P on which the workpiece is attached is conveyed to the pallet pool station 9, the central processing unit 1 conveys the pallet P on which the workpiece is attached from the pallet pool station 9 according to the machining schedule data B5. A transfer command for transferring to the pallet loading / unloading device 10 (i) of a predetermined processing station ST (i) is sent to the transfer control device 6 via the interface 5, and NC program data corresponding to the workpiece is sent. Through the interface 11 to the numerical control device 12 (i) of the predetermined processing station ST (i). When the pallet P to which the workpiece is attached is conveyed to the pallet loading / unloading device 10 (i) of the machining station ST (i), the central processing unit 1 sends a machining command of the workpiece via the interface 11 to the machining station ST (i).
It is sent to the numerical controller 12 (i) of (i). And
The pallet P on which the workpiece is attached is the numerical control device 12
When the pallet P that was taken into the machine tool MT (i) controlled by (i) and was in the machine tool MT (i) is taken out to the pallet loading / unloading device 10 (i), the numerical controller 12 ( In i), the machining cycle is executed according to the NC program data, and the central processing unit 1 registers "P" during machining in the machining progress data B4 of the corresponding workpiece. After the completion of the machining cycle, the numerical controller 12 (i) sends a machining cycle completion signal to the central processing unit 1 via the interface 11, and the central processing unit 1 outputs the machining progress data B4 of the corresponding workpiece to the completion of machining " Set "O".

Then, the next work is transferred to the pallet loading / unloading device 10 (i), and the pallet P, which has been processed, is transferred from the machine tool MT (i) to the pallet loading / unloading device 10 (i).
In response to (i), the central processing unit 1 determines from the machining process data B2 whether or not there is a next process of the workpiece for which the machining cycle has been completed, and if there is a next process, the pallet P to which the workpiece is attached is palletized. The pallet loading / unloading device 10 of the processing station ST (i + 1) that executes the processing cycle of the next process from the loading / unloading device 10 (i) via the transport carriage 7.
A transport command for transporting to (i + 1) is sent to the transport control device 6 via the interface 5. If there is no next step, a transfer command for transferring the pallet P to which the workpiece is attached from the pallet loading / unloading device 10 (i) to the predetermined pallet pool station 9 via the transfer vehicle 7 is transferred via the interface 5. It is sent to the transport control device 6. Then, the central processing unit 1 creates the collection instruction data B6 and issues the work piece collection instruction through the interface 2 to the work instruction C.
A transfer command is sent via the interface 5 to the operation panel 3 equipped with the RT, and a transfer command for transferring the pallet P to which the workpiece is attached from the pallet pool station 9 to the setup station 13 via the transfer carriage 7. To the device 6. Then, when the pallet P is conveyed to the setup station 13, the worker who sees the display of the recovery instruction removes the workpiece from the pallet P, and the work instruction CR
Press the collection complete button on the operation panel 3 equipped with T. Upon completion of this collection, the central processing unit 1 registers the collection completion "F" in the machining progress data B4 of the corresponding workpiece, and the pallet P from which the workpiece has been removed is transferred from the setup station 13 via the transport carriage 7 to the pallet pool. A transport command for transporting to the station 9 is sent to the transport control device 6 via the interface 5.

When a machining abnormality occurs during machining of a workpiece at the machining station, for example, a machining abnormality occurs in the third process of the third pallet with the part number "W1", the abnormality detecting means A4 causes the abnormal workpiece part number "W1". And the process number "3" are detected (steps S11 and S12), and the recovery instruction data B6 is registered with the recovery instruction "part number" W1 ", process number" 3 ", state" abnormal "" ( Step S1
3). Then, the machining interruption means A5 processes the machining progress data B4.
The part number "W1" and the process number "3" in the column of "P" are left as they are to interrupt the machining of the abnormal workpiece, and the abnormal workpiece is once transported from the machining station to the pallet pool station. Allow (Step S1
4).

Then, the reworking means A6 takes out the part number "W1" and the process number "3" of the abnormal workpiece (step S15), and operates the abnormal workpiece according to the operation of the operation panel provided with the work instruction CRT by the worker. It is conveyed from the pallet pool station to the setup station and its handling is judged (step S16). When the operator presses the re-machining button, the part number "W" in the machining progress data B4
"P" registered in the column of 1 "and the process number" 3 "is rewritten to" S "(step S17), and the machining process data B
The data of the part number "W1" and the process number "3" in 2 is taken out to create a machining schedule and registered in the machining schedule data B5 (steps S18 and S19). As a result, abnormal workpieces are sequentially transported from the processing station of the process in which the abnormality has occurred, and the normal machining cycle is executed.
When all processing cycles are completed, all processing is completed.

On the other hand, if it is determined in step S16 that the operator has pressed the intermediate machining button, the machining process data B
The presence / absence of data of the part number “W1” and the process number “4” (that is, the next process) in 2 is determined (step S20). If there is the data of the next process, the part number in the machining process data B2. The data of "W1" and the process number "4" is taken out (step S21), and "P" registered in the column of the part number "W1" and the process number "3" in the machining progress data B4.
To "O", part number "W1", process number "4"
"S" is registered in the column of (step S22). And
A machining schedule having a part number “W1” and a process number “4” is created and registered in the machining schedule data B5 (step S19). As a result, the abnormal workpiece is sequentially conveyed from the next process where the machining abnormality has occurred, that is, the machining station that executes the machining cycle of the fourth process, and the normal machining cycle is executed. finish. On the other hand, in the determination step S20, if there is no data for the next process, the "P" registered in the columns of the part number "W1" and the process number "3" in the machining progress data B4 is rewritten to "F". (Step S23), all processing is ended. On the other hand, if the worker presses the end button in the determination step S16, the machining progress data B4
"N" is registered in the column of the part number "W1" and the process number "3" and thereafter (excluding the final step) and "F" is registered in the column of the final step (step S24), and all the processes are performed. To finish.

[0017]

As described above, according to the re-machining control device in the FMS of the present invention, when a machining abnormality occurs, re-machining can be performed without performing unnecessary operation, so that it is efficient. Machining becomes possible, and the operating rate of the entire system can be greatly improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a rework control device in an FMS of the present invention.

FIG. 2 is a flowchart illustrating an operation example of the device of the present invention.

FIG. 3 is a partial diagram of FIG.

FIG. 4 is a diagram showing an example of first data used in the device of the present invention.

FIG. 5 is a diagram showing an example of second data used in the device of the present invention.

FIG. 6 is a diagram showing an example of third data used in the device of the present invention.

FIG. 7 is a diagram showing an example of fourth data used in the device of the present invention.

FIG. 8 is a diagram showing an example of fifth data used in the device of the present invention.

FIG. 9 is a diagram showing an example of sixth data used in the device of the present invention.

FIG. 10 is a related diagram of the data shown in FIGS. 4 to 9;

FIG. 11 is a diagram showing a configuration example of a general FMS.

FIG. 12 is a block diagram showing an example of a conventional rework control device in an FMS.

FIG. 13 is a flowchart illustrating an operation example of a conventional device.

[Explanation of symbols]

 A4 Abnormality detection means A5 Processing interruption means A6 Reprocessing means

Claims (1)

[Claims] 1. An FMS that conveys a workpiece between a plurality of machining stations, a pallet pool station and a setup station for machining, and detects an abnormal workpiece when a machining abnormality occurs at the machining station. Detection means, machining interruption means for interrupting the machining of the abnormal workpiece to convey the abnormal workpiece from the machining station in which the machining abnormality has occurred to the pallet pool station, and the abnormal workpiece according to the operator's instruction. And a reworking unit for carrying out the reworking from a predetermined working station by carrying it from the pallet pool station to the setup station.