JPH0542685B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a numerically controlled machine tool such as a machining center, in which when a subprogram is called and executed multiple times from a main program, any step within the subprogram is executed. The present invention relates to a machining restart control method in a numerically controlled machine tool, which can easily instruct and execute machining start from .

(b) Background of the Technology When a numerically controlled machine tool is used to machine a workpiece based on a machining program, the machining operation of the workpiece may be interrupted in the middle of the machining program for various reasons. In this case, when machining is restarted, it is necessary to restart machining of the workpiece from the interrupted step of the machining program.

This kind of work can be done easily if the machining program consists only of the main program, but
The main program calls the subprogram,
Furthermore, the called subprogram (hereinafter, the subprogram called by the main program will be referred to as the "first subprogram") is further called another subprogram (hereinafter, the subprogram called by the first subprogram will be referred to as the "second subprogram"). program"
It is called. ), the task becomes complicated.

(c) Prior art and problems Conventionally, when resuming machining in the middle of a machining program, the user simply searches for the sequence number attached to the interrupted step in the machining program or the specific machining (drilling, punching), etc. and find out,
A method has been proposed for restarting machining from that step (Japanese Patent Laid-Open No. 186805/1983).

However, since subprograms are usually repeatedly executed multiple times, when resuming machining from a step in the middle of the first or second subprogram, it is not possible to search simply by sequence number. It was not possible to specify whether to execute from the first time. That is, for example, in FIG. 2, the main program MPR calls the first subprogram SUB1, and the first subprogram SUB1 calls the second subprogram SUB2.
When calling the second subprogram SUB2,
When restarting machining from the 10th execution of the step with the sequence number SEQ of N0240, the operator cannot specify the number of executions of subprogram SUB2 when restarting machining. Machining cannot be restarted immediately even if the step is searched for (this is because the search operation is performed in the order of execution of the machining program PRO.
The main program MPR is executed sequentially from the top of Figure 2. First, the sequence number SEQ of the main program MPR is N0500, and the first subprogram SUB
1, and further enters the second subprogram SUB2 with sequence number SEQ of N0125, and the search operation ends when the sequence number SEQ of N0240 of the subprogram SUB2 is first found. Therefore, if the machining is restarted at this point, the machining after restarting will be performed from the first execution of the second subprogram SUB2, which will cause an inconvenience. ), and an additional 9 search operations are performed by the operator in the machining program.
It wasn't until I repeated the entire PRO that I was able to reach my desired step. Therefore, while the target step is being searched, the operator is unable to leave the machine because he or she has to instruct the machine to search, and it takes a lot of time and a lot of effort on the part of the operator to restart machining. There was.

Also, on the other hand, once the desired sequence number
Once SEQ has been searched, there is a way to manually change the machining program PRO itself without repeating the search operation. For example, the command (symbol L03 at the end of each step,
L05, L02, etc. indicate the number of times the called program is repeated. That is, the instruction "M98P1000L05" in the step with the sequence number SEQ of N0125 of the first subprogram SUB1 instructs to repeatedly execute the second subprogram SUB with the program number P1000 five times. )
By changing , the remaining number of executions is adjusted and the machining program PRO is changed as if the subprogram had been executed multiple times. In the example in Figure 2, the second subprogram SUB2
In the 10th execution of the sequence number SEQ
restarts machining from N0240, the sequence number SEQ of the main program MPR changes the number of repetitions of N0500 from L03 to L02, and the first subprogram
By changing the number of repetitions of SUB1 with sequence number SEQ of N0125 from L05 to L03,
Sequence number of second subprogram SUB2
The step with SEQ N0240 is in the same state as if it had already been executed nine times. Here, there is also a method of restarting the machining from sequence number N0240, but this method involves changing the program, so it is easy to make mistakes and is very dangerous.

Furthermore, there is a method of restarting machining from a point other than a specific program block, such as when steps in a subprogram are not assigned step identification symbols such as sequence numbers SEQ, but this method involves changing the program. Therefore, it is impossible to specify every step, making it easy to make mistakes and pose great risks.

(d) Purpose of the Invention In order to eliminate the above-mentioned drawbacks, the present invention eliminates the troublesome task of having an operator repeatedly command a search operation for the step at which machining should be restarted until the number of repetitions at which machining should be restarted is reached. The object of the present invention is to provide a simple and highly reliable machining restart control method in a numerically controlled machine tool that does not require unnecessary and error-prone program changes.

(e) Structure of the Invention In other words, the present invention provides a program identification code of a subprogram for which processing is to be restarted, a step identification code closest to the start step, and the number of offset steps from the step identification code to the start step; A memory is provided to store the number of times the subprogram is repeatedly executed until the machining of the start step is restarted, and when the step identification symbol of the start step is not attached when the machining is restarted,
A start step is specified from the program identification symbol of the subprogram stored in the memory, the nearest step identification symbol, and the offset step number, and the specified start step reaches the number of executions stored in the memory. The machining program is continuously and virtually executed from the beginning until the start step, and when the start step has been virtually executed a predetermined number of times, the interrupted machining is actually resumed from the start step. Ru.

(f) Embodiments of the invention Hereinafter, embodiments of the invention will be specifically described based on the drawings.

Fig. 1 is a control block diagram of a machining center to which the machining restart control method for a numerically controlled machine tool according to the present invention is applied, and Fig. 2 shows an example of the relationship between the main program, the first subprogram, and the second subprogram in the machining program. 3 is a front view showing the display control panel of the machining center shown in FIG. 1, and FIG. 4 is a flowchart showing an example of a machining restart control program.

Machining center 1, which is a numerically controlled machine tool
As shown in FIG. 1, it has a main control section 2, and the main control section 2 is connected via a bus line 3 to a keyboard 5, a display 6, a machining restart control section 7, a machining program memory 9, and a tool. A route calculation section 10, a mechanism operation control section 11, etc. are connected. A restart position memory 12, a counter 13, and a processing restart control program memory 15 are connected to the processing restart control section 7.
The mechanism operation control section 11 is provided with a main shaft 17, a table 19, an ATC device (not shown), etc., which constitute the mechanism section 16, and can be freely controlled by the mechanism operation control section 11.

Since the machining center 1 has the above configuration, machining by the machining center 1 is performed based on the machining program PRO stored in the machining program memory 9. That is, the main control section 2
The machining program PRO read out from the machining program memory 9 by
PASS is calculated and output to the mechanism operation control section 11. In the mechanism operation control section 11, the tool path calculation section 1
Spindle 1 based on the tool path PASS calculated at 0.
7. Driving and controlling the table 19 etc. to execute machining corresponding to the machining program PRO.

By the way, the machining program PRO in the machining program memory 9, as shown in FIG. subprogram SUM1, and further the first subprogram SUB
It has a second subprogram SUM2 as a subroutine called and executed by SUM1. Main program MPR, subprogram
A program number PNO for identifying each program is attached to the first step of SUB1 and SUB2, and a sequence number SEQ is attached to the main step of each program. Therefore, the program number PNO and the program number
If the sequence number SEQ in the program corresponding to PNO is known, one step in the machining program PRO can be specified. Note that the steps in the machining program PRO have sequence numbers SEQ.
may not be attached, but in that case, by specifying the number of steps from the step with the nearest sequence number SEQ as the offset step number, the machining program PRO
It is possible to specify every step in the process.

In the case of the machining program PRO shown in Fig. 2, its execution begins with reading out the main program MPR, and sequentially moving the machining program downward from the steps in the upper part of the main program MPR.
PRO is being executed, but the steps in the middle,
That is, in the step with sequence number SEQ N0500, the command "M98P0100L03" is stored. This command calls the program P0100 (the calling command is M98) and executes it three times (the execution command is L03, and the number at the end indicates the number of times the called program has been executed). The main control unit 2 calls the program whose program number PNO is P0100 in the machining program memory 9 as the first subprogram SUB1, and executes it three times. The sequence number SEQ is also included in the step of the subprogram SUB1.
There is a command to call another program in N0125 and N0175, and in N0125, the program number
Call the program whose PNO is P1000 as the second subprogram SUB2 and execute it repeatedly five times,
In N0175, the same program whose program number PNO is P1000 is used as the second subprogram SUB2.
This is a command to call and execute twice as follows. That is, when executing this machining program PRO, the first subprogram SUB1 is executed three times,
The second subprogram SUB2 will be executed 21 times.

During machining based on this machining program PRO,
Execute the second subprogram SUB2 9 times, 10
If the operator interrupts the machining operation at the step with the sequence number SEQ N0240 for the 10th time and then attempts to restart the machining from the step N0240 of the 10th subprogram SUB2, the operator
Press the machining restart instruction button 5a on the keyboard 5 built into the display control panel 20 shown in the figure to output the machining restart command RS to the main control unit 2 and the program number of the program for which machining should be restarted.
PNO (in this case, P1000) and the program number
Sequence number assigned to the step at which machining should be restarted in a program compatible with PNO
Enter SEQ (N0240 in this case) and the number of repetitions N (10 in this case) when restarting machining using the numeric keypad or the like. In addition, the sequence number SEQ
When restarting machining from a step that is not marked with a sequence number, enter the number of steps from the step with the nearest sequence number SEQ as the offset step number OS. in this way,
Various information entered from the keyboard 5 is stored in the third
As shown in the figure, it is displayed on a display 6 built into a display control panel 20, and is also stored in a restart position memory 12 via a machining restart control section 7.

On the other hand, the main control unit 2 receives the machining restart command RS.
A machining restart control program is sent to the machining restart control section 7.
A command is given to restart machining from a predetermined step based on the RMP. The machining resumption control section 7 reads the machining resumption control program RMP from the machining resumption control program memory 15 and executes it. As shown in FIG. 0
Initialize and then start the machining program.
The main program MPR in PRO is sequentially searched from its first step in the same way as machining based on the normal machining program PRO, and in step S2 the program number PNO of the program currently being read and the restart position memory 12 are searched. It is determined whether the program numbers PNO of the programs stored in the program for restarting machining according to the operator's instructions match. In this case, the program number PNO of the program currently being read is P0001, and the program number PNO specified by the operator is
P1000, so the two do not match, and the step goes to step S3, where the step is virtually processed only inside the numerically controlled machine tool (that is, without actually driving the mechanical parts 16 such as the spindle 17 and table 19). ,
Execute virtually inside the machine. ) Executes internal processing operations and enters the next step in step S4. In this way, while the steps of the main program MPR are executed one after another, the first subprogram SUB1 is called at sequence number N0500, and the subprogram SUB2 is virtually executed. The sequence number of the subprogram is N0125, and the second subprogram SUB2 is called and its virtual execution begins, but in the subprogram SUB2, its program number PNO is the restart position memory 12.
Since it matches the program number PNO stored in the subprogram SUB2, step S5 is entered and the sequence number PNO in the subprogram SUB2 is entered.
It is determined whether SEQ matches the sequence number SEQ in the restart position memory 12, which is specified by the operator and should restart machining. If the two do not match, the process goes to step S3, where the relevant step is virtually processed within the machine, and the process goes to the next step at step S4.

In the meantime, the execution of the machining program PRO reaches sequence number N0240, which is the step at which the operator has instructed to restart machining. Then,
Step S6 is entered from step S5, and the machining restart control section 7 increments the counter 13 by one. Next, in step S7, it is determined whether or not the count value T of the counter 13 matches the number of repeated executions N in the restart position memory 12.
Determine whether the counting work by
If they do not match, the process returns to step S3 and performs the internal processing of that step. In this way, the count value T of the counter 13 is set to the restart position memory 12.
Step S3 until it matches the number of repetitions N in
When the count value T matches the number of repeated executions N in the restart position memory 12, this step becomes the step at which the machining instructed by the operator should be restarted. To be more specific, in the case of this embodiment, the program with program number P0100 instructed by sequence number N0500 of the main program MPR is completely internally processed once, and then the second execution is started, and the subprogram is An instruction is issued to repeat the second subprogram SUB2 at the step with the sequence number N0125 of SUB1 five times, and then the subprogram SUB
2 is completely executed twice, and when the third execution starts and the sequence number reaches N0240, the count value T of the counter 13 becomes 10, which matches the number of repeated executions N in the restart position memory 12.

Therefore, in step S7, the counter 13
It is determined that the counting work has been completed, and the processing restart control unit 7 immediately starts the second subprogram.
Processing resumes from the predetermined step specified by the SUB2 operator. If no sequence number SEQ is attached to the step where machining should be resumed, the target step is searched from the steps with the nearest sequence number based on the offset step number OS input by the operator. and ask. In this case as well, what the counter 13 counts is the step with the nearest sequence number that served as the reference for inputting the offset step number OS.

When restarting machining, the machining program PRO repeatedly and virtually executes the program to restart machining a number of times equivalent to the number of repetitions N specified by the operator, so the numerically controlled machine tool The machining program PRO is in the same execution state as when the machining was interrupted, and it is possible to immediately execute the machining program PRO and properly execute the machining program PRO for the part after the machining was interrupted.

Note that the above embodiment is based on the machining program PRO.
is the main program MPR and the first subprogram called by the main program MPR
Although we have described the case where the machining program PRO is composed of SUB1 and the second subprogram SUB2 called by the first subprogram SUB1, the present invention is applicable no matter what kind of subroutine calling structure the machining program PRO has. Of course it is possible.

(g) Effect of the Invention As explained above, according to the present invention, the program identification symbols (including codes and characters) such as the program number PNO of the subprograms SUB1 and SUB2 for which machining should be restarted, and the nearest start step. A step identification symbol (including codes and characters) such as the sequence number SEQ of the step, the number of offset steps OS from the step identification symbol to the start step, and the number of times N of repeated execution of the subprogram until processing is resumed at the start step. A memory such as a restart position memory 12 is provided to store a program identification symbol of the subprogram stored in the memory when the step identification symbol of the start step is not attached when machining is restarted.
A start step is specified from the nearest step identification symbol and the offset step number, and the specified start step is executed continuously and virtually from the beginning of the machining program until the number of executions stored in the memory is reached. When the start step has been virtually executed a predetermined number of times, the interrupted machining is actually restarted from the start step. , the identification symbol of the step, and the number of repetitions N, it is now possible to immediately execute the machining program PRO from the point at which the appropriate number of repetitions has been reached. Not only does the operator not have to go through the trouble of repeatedly instructing search operations until the desired value is reached, it also eliminates the need to change programs that are prone to errors, making it a simple and reliable method for numerically controlled machine tools. It is now possible to provide a machining restart control method, and in addition, in the machining program PRO, the step at which machining should be restarted may not have any step identification symbol such as the sequence number SEQ of the start step. In this case, the operator can specify the number of steps from the step with the nearest step identification number as the offset step number OS.
It becomes possible to specify every step.

[Brief explanation of the drawing]

Fig. 1 is a control block diagram of a machining center to which the machining restart control method for a numerically controlled machine tool according to the present invention is applied, and Fig. 2 shows an example of the relationship between the main program, the first subprogram, and the second subprogram in the machining program. 3 is a front view showing the display control panel of the machining center shown in FIG. 1, and FIG. 4 is a flowchart showing an example of a machining restart control program. 1... Numerical control machine tool (machining center),
9...Machining program memory, 12...Memory (resume position memory), N...Number of executions, PNO...Program identification symbol (program number), SEQ...Step identification symbol (sequence number), MPR...Program (main program), SUB1, SUB2...Program (subprogram), PRO...Machining program, OS...Number of offset steps.

Claims (1)

[Scope of Claims] 1. It has a machining program memory that stores a machining program consisting of a main program and subprograms with identification symbols, and is capable of restarting and executing machining from any starting step in the subprogram. In a numerically controlled machine tool that performs machining, the program identification code of the subprogram for which machining is to be restarted, the step identification code closest to the start step, the number of offset steps from the step identification code to the start step, and the machining at the start step. A memory is provided to store the number of times the subprogram is repeatedly executed until restarting, and when the step identification symbol of the start step is not attached when machining is restarted, the program identification symbol of the subprogram stored in the memory is provided. , specify a start step from the nearest step identification symbol and the offset step number, and execute the machining program continuously and virtually from the beginning until the specified start step reaches the number of executions stored in the memory. and when the start step has been virtually executed a predetermined number of times,
A method for controlling restart of machining in a numerically controlled machine tool, wherein the interrupted machining is actually restarted from the start step.