JPH10133727A - Method and device for controlling nc machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the handling of an NC machine tool easier. SOLUTION: By state-storing commands 3, 5, 8, and 98 in an NC program, specific positions in a program and positions of a machine tool corresponding to the positions in the NC program are stored. The storage of the positions in the NC program and the positions of the machine tool are updated into the latest positions by the state store commands. When the NC program is interrupted, the position of the machine tool is restored with a state restoration command 0 based on a stored specific position and at the same time, the NC program is searched based on the specific position. Therefore, the handling of the NC machine tool becomes easier and the man-hour of an operator and the product cost are reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a control method and a control device for an NC machine tool.

[0002]

2. Description of the Related Art When machining is performed using an NC machine tool, the NC program may be temporarily interrupted due to unavoidable circumstances during operation, and an operator may enter the NC machine tool. For example, operation confirmation at the time of first product processing (confirmation of interference of jigs and tools) Confirmation of processing state at the time of first product processing (measurement of cutting condition and dimensions of products) Repair of abnormal processing (breakage of tools, tool wear) This corresponds to the measurement of machine accuracy. At this time, the power of the NC machine tool is shut off in order to prevent an accident due to a malfunction of the NC machine tool. Then, after the above operation is completed, the power is connected again after the worker goes out of the NC machine tool, and the machining is continued. At this time, a control device for returning the NC machine tool to a position before the power is cut off is disclosed in Japanese Utility Model Laid-Open No. 1-96005.

[0003]

By the way, when the power of the NC machine tool is cut off, the following problems occur.
The displacement of the operation control shaft of the device occurs. The storage of the processed steps of the NC program is erased. A shift occurs in the command sequence of the NC program.

Therefore, in order to continuously restart the automatic operation based on the NC program from the interrupted state, it is necessary to restore the state (1) to (2) by a manual operation and to return the NC control device and the NC machine tool to a state in which the continuous restart can be performed. is there. In FIG.
An example of a machining NC program and a work procedure for performing a continuous restart after a temporary suspension are shown. The NC program for processing includes one or a plurality of cutting command blocks (step 2, step 2) for actually performing processing after a preparation command (step 1) for setting various conditions is output to the machine tool.
Step 3) is performed. Further, a preparation command (step 4) for performing the next condition setting is output, and subsequently, a cutting command block (step 5) is executed. Thus, the procedure of executing the cutting command block after the preparation command is repeated, and the program is completed after the cutting command block (step 90) is completed.

[0005] In the above-mentioned NC program, for example, when the execution of the program is interrupted in the cutting command block (step 5), the re-continuation procedure is as follows. 1. Determine the restart position. That is, in order to execute the cutting block of (step 5) again, the preparation command (st
Return to ep 4). 2. Manually return the machine tool to the state at the end of the cutting command block (step 3). 3. Manually input information indicating that the program up to (step 3) has been executed to the NC unit. 4. Set the program start position according to the preparation command (step 4). 5. Confirm that there are no mistakes in the re-continuation preparation operations in 1 to 4 above. 6. Restart automatic operation while reducing the feed overwrite of the machine tool. 7. While confirming that there is no mistake in the operation of the machine tool, gradually release the aperture of the feed overwrite and return to the normal operating speed.

As described above, the preparation operation for restarting requires many operation steps for returning the position of the machine tool and manual input for locating the NC program to the interruption position. In addition, the required input content differs depending on the type of the NC machine tool, the condition when the NC program is temporarily suspended, the content of the control command issued after the restart, and the like. Therefore, it is necessary for the operator to master the NC machine tool,
In order to prevent machine interference and processing defects due to incorrect operation,
Preparatory work before restarting automatic driving was very time-consuming, as the work required careful attention.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to easily perform a continuous restart after an NC program is temporarily interrupted due to power cutoff of an NC machine tool. By doing so, it is possible to make the handling of the NC machine tool simpler, to reduce the number of man-hours for the operator, and to reduce the product cost.

[0008]

According to the present invention, there is provided a method for controlling an NC machine tool, comprising the steps of:
Storing a predetermined position on the C program and a position of the machine tool corresponding to the position on the program;
Updating the storage of the position on the program and the position of the machine tool; returning the position of the machine tool based on the predetermined position when the NC program is interrupted; Searching for the program.

According to the present invention, the predetermined position on the currently executed NC program and the storage of the position of the machine tool corresponding to the position on the program are constantly updated, and even if the NC program is interrupted, the predetermined position is maintained. The position of the machine tool and the position on the NC program necessary for continuous restart are grasped from the memory of the machine tool, and the machine tool and the NC are transferred to each position.
Locate the program and restart immediately.

A control device for an NC machine tool according to the present invention for solving the above problems stores a predetermined position on an NC program being executed and a position of the machine tool corresponding to the position on the program. A predetermined position storage means;
When the C program is interrupted, a machine position return unit that returns the machine tool to the storage position based on the storage position of the predetermined position storage unit, and an NC program based on the storage position of the predetermined position storage unit. And program position return means for performing cueing to a predetermined position.

According to the above configuration, the predetermined position storage means grasps the position on the NC program which is always being executed and the position of the machine tool corresponding to the position on the program.
Even when the NC program is interrupted, the machine position return means and the program position return means are operated in accordance with the storage position, and the machine tool is moved to the position of the machine tool required for continuous restart and the position on the NC program. And lead the NC program.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The same or corresponding parts as those in the conventional example are denoted by the same reference numerals, and detailed description is omitted.

As shown in FIG. 4, a control device for an NC machine tool according to an embodiment of the present invention has a machining control means 1, a predetermined position storage means 2, a machine position return means 3, and a program position return means 4. . The machining control means 1 has an NC program (FIG. 1) for operating the NC machine tool 5 to actually perform machining. The predetermined position storage means 2 has a special subprogram (FIG. 2) for storing the position on the currently executed NC program and various setting conditions of the NC machine tool 5 corresponding to the position. Further, the machine position return means 3 is for returning the NC machine tool 5 based on various setting conditions stored in the predetermined position storage means 2 when the NC program is interrupted. Further, the program position return means 4 performs cueing to a predetermined position on the NC program based on the storage position of the predetermined position storage means 2. The machine position return means 3 and the program position return means 4 operate on the same special subprogram (FIG. 3).

First, the processing control means 1 will be described with reference to FIG. The processing control means 1 has a processing NC program (main program) as shown. This NC program corresponds to both the case where machining is started from the beginning and the case where continuous restart is performed. The general flow of the NC program repeats a procedure of executing a cutting command block after a preparation command, similarly to the conventional NC program described with reference to FIG. However, as a feature of this embodiment, between each preparation command and the cutting command block, a state storage command ((3), (5), (8), (8), for storing the setting conditions of the machine tool at that time. 98)). Further, when the NC program execution start command (0) is output, it is determined whether the command is for starting machining from the beginning or relating to continuous restart. State return command (1) is included.

Next, the predetermined position storage means 2 will be described.
The predetermined position storage means 2 has a special subprogram for the state storage processing of FIG. This subprogram corresponds to N in FIG.
When the state storage command is issued in the C program,
Moving to A1 in FIG. 2, for example, the current various setting conditions (the position coordinates of each control axis, the tool number in use, the tool number of the tool to be used next, the rotation state of the spindle, etc.) in the NC machine tool,
(I.e., the position of the machine, which is collectively referred to as the state of use of the cutting coolant). Further, a cutting command block in the NC program corresponding to the setting condition stored in (i) is stored (ii), and a position on the NC program is determined based on the block. Thereafter, the process returns to the cutting command block located immediately after the output of the state storage command in FIG. In the present embodiment, the position of the machine and the position in the NC program stored in the predetermined position storage means 2 are updated to the latest one each time a new state storage command is issued in the NC program. You. Therefore, in the following description, the predetermined position storage means 2 will be referred to as the latest position storage means 2. The stored contents of the latest position storage means 2 are protected by a backup power supply or the like even if the power is shut off.

Next, the mechanical position returning means 3 and the program position returning means 4 will be described. The mechanical position return means 3 and the program position return means 4 operate on a special subprogram of the state return processing shown in FIG. When the state return command (1) is output in the NC program of FIG. 1, this subprogram shifts to B1 of FIG. 3 to determine whether or not the power of the NC machine tool has been cut off (a ). That is, when the NC program execution start command (0) is output and the command is for starting machining from the beginning, there is no power interruption, and the NC
If the command at the start of the execution of the program relates to the continuous restart, it is determined that the power is shut off. In FIG.
If it is determined in a) that the power is not shut off, the process shifts to the first preparation command (2) in the NC program of FIG. 1 and executes the subsequent NC program. When it is determined that the power is shut off, the position of the NC machine tool is moved in accordance with various conditions stored in the latest position storage means 2 (b). Further, the process proceeds to B2, where a desired cutting command block on the NC program is located. Then, the execution of the NC program is restarted.

A procedure for controlling the NC machine tool 5 by executing each of the programs illustrated in FIGS. 1 to 3 will be described below. In the following description, it is assumed that machining is started from the beginning, the NC program is interrupted in the middle, and then the machine is continuously restarted.

First, in FIG. 1, a command (0) at the start of execution of the NC program is output.
1) is output. Then, the process proceeds to the sub-program shown in FIG. 3, and it is determined that the power is not shut off in (a). Then, the process returns to the preparation command (2) in FIG. And
With the state storage command (3), the processing shifts to the subprogram shown in FIG. 2, the machine tool position in the preparation command (2) is stored (i), and the cutting command block following (2) is (4).
(Ii). Then, the cutting command block (4) is executed. Further, in the state storage command (5), the position of the machine tool at this point and the fact that the subsequent cutting command block is (6) are stored. Then, the cutting command block (6) is executed. Next, a preparation command (7) is output. Further, the state program (8) shifts to the subprogram of FIG. 2 and the machine tool position (i) in the preparation command (7) and the cutting command block following the preparation command (7) are (9). (Ii).

Now, it is assumed that power is interrupted during the execution of the cutting command block (9). Thereafter, when the power is connected again, the displacement of the operation control axis of the NC machine, the loss of storage of the processed process of the NC program, the command of the NC program are provided between the machining control means 1 and the NC machine tool 5. Inconveniences such as a sequence shift occur. At this time,
The latest position storage means 2 stores and stores the position of the machine tool in the preparation command (7) and the cutting command block following (9).

Here, for the continuous restart, the execution start command (0) is output in the NC program of FIG. 1 and then the state return command (1) is output. Then, when shifting to the sub-program shown in FIG. 3, it is determined in (a) that the power has been shut off, and in (b), the machine position return means 3 is instructed based on the contents stored in the latest position storage means 2 by N
A position return command for the C machine tool 5 is output. And N
The C machine tool 5 is automatically returned to the position of the machine tool set by the preparation command (7) according to the instruction of the machine position return means 3. Further, the subprogram shifts to B2 and outputs a program position return command to the program position return means 4 based on the contents stored in the latest position storage means 2. Then, the cutting command block (9) on the NC program is searched for. Thereafter, the machining following (10) is performed again according to the NC program shown in FIG.
After completing step 9), the program is completed.

In the NC program shown in FIG. 1, there is no restriction on the position on the program where the state storage command is inserted, and when more state storage commands are inserted, the processing time increases. Automatic operation can be restarted at an appropriate position.

The operation and effect according to the embodiment of the present invention having the above configuration are as follows. NC of processing control means 1
In order to store the latest position on the NC program and the storage of the position of the machine tool corresponding to the position on the NC program, the program returns the state return command ((3), (5), (8), (98)). And
In response to each state return command, the process shifts to the subprogram (FIG. 2) of the latest position storage means 2 to store the current position of the machine tool and the position on the program. Then, the process returns to the NC program. Also, every time a status return command is issued on the NC program, the flow shifts to the subprogram (FIG. 2), and N
The storage of the position on the C program and the position of the machine tool is always updated to the latest one. The memory of this latest position is
It is saved even if the NC program is interrupted.

In the case of continuous restart, first, N
By outputting a command (0) at the start of execution of the C program, and subsequently outputting a status return command (1), the flow shifts to the subprogram shown in FIG. Then, it is determined in (a) whether or not the power is shut off. In the case of a restart, it is confirmed here that the power has been cut off. Therefore, from the stored contents stored in the latest position storage means 2, the position of the machine tool required for continuous restart and the NC program Know your location. Then, by restarting the position of the NC machine tool and searching for the desired NC program, it is possible to quickly restart.

[0024]

According to the present invention, the following effects are obtained. According to the control method for an NC machine tool according to claim 1 of the present invention, the storage of a predetermined position on the currently executed NC program and the position of the machine tool is always updated, and even when the NC program is suddenly interrupted, From the storage of the predetermined position, the position of the machine tool and the position on the NC program required for the continuous restart can be grasped, and the restart can be promptly performed. Therefore, even in an emergency such as when power is cut off, the handling of the NC machine tool becomes easier, and it is possible to reduce the number of man-hours for the worker and the product cost.

According to the NC machine tool control device of the present invention, in the predetermined position storage means, a predetermined position on the currently executed NC program and a machine tool corresponding to the position on the program. Position can be grasped. Then, even when the NC program is suddenly interrupted, the machine position return means and the program position return means are operated in accordance with the storage position, and the position of the machine tool and the position on the NC program required for continuous restart are automatically determined. Can be deduced. Therefore, even in an emergency such as when the power is shut off, the handling of the NC machine tool becomes simpler, and it is possible to reduce the number of man-hours for the worker and the product cost.

[Brief description of the drawings]

FIG. 1 is a flowchart of an NC program used for a control device of an NC machine tool according to an embodiment of the present invention.

FIG. 2 is a flowchart of a special subprogram used for the control device of the NC machine tool according to the embodiment of the present invention.

FIG. 3 is a flowchart of a special subprogram used for the control device of the NC machine tool according to the embodiment of the present invention.

FIG. 4 is a block diagram showing a control device of the NC machine tool according to the embodiment of the present invention.

FIG. 5 is used for a control device of a conventional NC machine tool.
It is a flowchart of an NC program.

[Explanation of symbols]

 2 Predetermined position storage means 3 Machine position return means 4 Program position return means 5 NC machine tool (1) State return instruction (3) State storage instruction (5) State storage instruction (8) State storage instruction (98) State storage instruction

Claims (2)

[Claims] 1. A step of storing a predetermined position on an NC program being executed and a position of a machine tool corresponding to a position on the program, and updating the storage of the position on the NC program and the position of the machine tool. Performing a step of returning the position of the machine tool based on the predetermined position when the NC program is interrupted;
A method for controlling an NC machine tool, including a step of searching for a C program. 2. A predetermined position storage means for storing a predetermined position on an NC program being executed and a position of a machine tool corresponding to the position on the program, and the predetermined position storage means when the NC program is interrupted. A machine position return unit for returning the machine tool to the storage position based on the storage position of the predetermined position storage unit;
A control device for an NC machine tool, comprising: program position return means for performing cueing to a predetermined position on a C program.