JP4656432B2 - Numerically controlled machine tool and interrupt machining method - Google Patents

Description

  The present invention provides a numerically controlled machine tool for performing interrupt machining when interrupt machining is requested during execution of a machining program, returning the machining state to the original state when interrupt machining is completed, and restarting the interrupted machining And an interrupt processing method.

  In a numerically controlled machine tool, machining is performed according to a machining program (NC program), but there is often a demand to interrupt the machining in the middle of machining according to the machining program and perform another machining. Such processing is called interrupt processing. After interrupted machining is performed, it is necessary to resume the suspended machining. As shown in Patent Document 1, when interrupt processing occurs, the NC state and the interrupt position are stored, and after the interrupt processing is completed, the NC state and interrupt position are restored.

  In order to resume machining interrupted by interrupt machining, the machining program must be decoded and executed from the interrupted location. Therefore, the operator rewrites the machining program, and skips the portion that was machined before the interrupt machining by the modified machining program. Therefore, when interrupt machining is performed, the operator must correct the machining program, which requires labor and time.

  In addition, the machining may be interrupted at a place where it is inconvenient to resume the machining, and the machining may not be resumed. For example, in the case of finish machining by wire-cut electric discharge machining, when interrupt machining is requested, the wire electrode returns to the position where it was cut after interruption machining, so-called disconnection restoration causes streaks or the like in the machining portion Therefore, it is inconvenient to interrupt processing at such a position.

  In Patent Document 2, when machining is interrupted by interrupt machining, execution of an interruptable command is interrupted, and from the first machining feed command in the machining program to the end of machining feed executed immediately before execution of the interruption is skipped. Thus, an NC machining apparatus is disclosed in which a temporary file of a machining program in which the machining program is rewritten is created, and when the machining is resumed, the temporary file is called and executed from the beginning of the machining program.

Japanese Patent No. 3034270 JP 2000-293212 A

  However, in the case of the NC processing apparatus disclosed in Patent Document 2, it is necessary to create a temporary file. Since a temporary file is created from the main program of the machining program, interrupt machining processing cannot be performed unless there is a fast-forward command in the main program. Also, when machining with a subprogram, interrupt machining cannot be performed until the main program is returned. Also, if a command to perform so-called mirror machining or rotation is included in the middle of the main program, the machining program is skipped, so that it moves to a different location from the original command position, and the interrupted machining can be restored. Can not. For this reason, there is a case where interrupt processing cannot be performed substantially, and a long waiting time is required until interrupt processing is executed.

  In particular, in the case of wire-cut electric discharge machining, disconnection cannot be restored after interrupt machining when interrupt machining is requested. For this reason, interrupt processing cannot be performed at a location where disconnection recovery can be performed, and processing must be performed to a position where interrupt processing can be performed. Therefore, a long waiting time is required until interrupt processing is performed.

  In view of the above-described problems, the present invention provides a numerically controlled machine tool that can perform interrupt processing more reliably when interrupt processing is requested during execution of a processing program, and shortens the waiting time for interrupt processing. An object is to provide an interrupt processing method.

The numerically controlled machine tool of the present invention, when there is a request for interrupt machining during execution of a machining program, machining interrupting means for interrupting machining by executing the machining program up to a program block capable of interrupt machining, as recording data indicating the state of the NC device when decrypting the machining program machining program is retracted the processing thread decrypted running including information processing program recorded in the memory and the processing thread programs and retraction means for storing in storage means the current status, the interrupt processing means for performing interrupt processing to start the processing thread that executes decodes the interrupt processing of the machining program, said at shunting means when the interrupt processing is completed The saved recording data stored in the storage means and the saved processing Having a return means for resuming the interrupted have been processed after thread machining state according processing thread program has been directly read by the retracted to return the processing thread that has been said retracted in is returned to the original .

In the interrupt machining method of the present invention, when there is a request for interrupt machining during execution of a machining program, the machining program is executed up to a program block capable of interrupt machining, the machining is interrupted, and the machining program is decoded. Recording data indicating the state of the NC device including information on the machining program recorded in the memory by saving the machining thread being executed and the program of the machining thread are stored in the storage unit as they are in the current state, and an interrupt is made. The interrupt processing is performed by starting a processing thread that decodes and executes a processing program for processing, and when the interrupt processing is completed, the saved recording data stored in the storage means by the saving means and the saving data the retracted once was processing thread program has been the retracted reads as processing threads It was allowed to return, characterized in that to resume the processing that has been returned interrupted based on the machining status in accordance processing thread that has been said retracted.

In addition, the interrupt machining method of the present invention, when there is a request for interrupt machining during the execution of a machining program, when the broken program block can recover from the disconnection in the wire cut electric discharge machining, When the machining is interrupted at the position, and it is impossible to recover from the disconnection, the machining program is interrupted by executing the machining program up to the program block capable of interrupting machining, and the machining processing thread that decodes and executes the machining program is executed. The recorded data indicating the status of the NC device including the machining program information saved in the memory and the machining thread program are stored in the storage means as they are, and the machining program for interrupt machining is decoded and executed. When the interrupt processing is completed by starting the processing thread to perform interrupt processing The processing thread the recording data and the retracted that had been processed threaded program that has been said retracted program is stored in the storage means has been said retracted reading it in avoidance means is returned is the retracted According to the processing thread that has been used, the processing state is restored to resume the processing state.

  When there is a request for interrupt processing, processing is interrupted at a location where interrupt processing can be performed or a location where disconnection can be restored, and the processing thread for decoding and executing the processing program is saved as it is, processing processing for interrupt processing Since the processing thread that has been saved is restored after interrupt processing is started by starting a new thread, interrupt processing is performed at an appropriate location, and there is no need to create a temporary file. If there is no interrupt processing, interrupt processing is possible even in the middle of a subprogram, and the waiting time for interrupt processing is reduced.

  Also, since the machining thread is saved and the recorded data in the machining thread memory and the machining thread program are stored as they are, information such as the mirror and rotation when an interrupt occurs is also recorded. Machining can be resumed even if commands such as mirror machining and rotation are included on the way. In particular, in the case of wire-cut electrical discharge machining, the disconnection return waiting state is recorded and can be returned to the disconnection return position. Is done.

  FIG. 1 shows a part of a numerical control device of a numerically controlled machine tool. FIG. 2 shows an interrupt processing method in the wire cut electric discharge processing method as the interrupt processing method of the present invention. FIG. 3 particularly shows an interrupt processing portion of the interrupt processing method shown in FIG. FIG. 4 shows a machining example of wire cut electric discharge machining.

  When there is a request for interrupt machining during execution of the machining program, the machining interrupting means 1 executes the machining program up to a program block (hereinafter simply referred to as a block) capable of interrupt machining and then interrupts the machining. For this reason, when the machining is resumed after the interruption machining, the machining is not interrupted at a position that is inconvenient for the machining resume.

  The processing interruption means 1 according to the embodiment, when there is a request for interrupt processing during execution of the processing program, can perform disconnection recovery in the decoded block to be executed next, the head of the block Machining is interrupted at a position where disconnection can be restored. Further, when it is impossible to restore the disconnection in the decoded block to be executed next, the machining program is executed up to the block capable of interrupt machining, and then machining is interrupted.

  When the machining is interrupted by the machining interruption unit 1, the saving unit 2 saves the machining processing thread that decodes and executes the machining program. A thread is a smaller module that can be started from one active task. The processing thread is a thread that decodes and executes the processing program. The saving means 2 can save a plurality of processing threads.

  The machining thread stores all information indicating the state of the NC apparatus in the memory when the machining program including the machining program information is decoded during execution. By saving the machining thread, the recording data indicating the state of the NC apparatus when the machining program including the machining program information stored in the memory is decoded and the machining thread program are stored as they are in the storage means (not shown). Is done. The information indicating the state of the NC device is, for example, position information, processing conditions, information on mirrors and rotation, a processing state such as whether or not waiting for disconnection, and a processing program being decoded.

  When the processing thread is saved by the evacuation means 2 and the interrupt processing is performed, the interrupt processing means 3 activates the processing thread that decodes and executes the processing program for interrupt processing to perform the interrupt processing. The interrupt processing thread is a thread that decodes and executes an interrupt processing program.

  The return means 4 returns the machining thread that has been saved by the save means 2 when the interrupting machining is completed, and resumes the machining that has been suspended after the machining state is restored. The return means 4 reads the processing thread recorded data and the program stored in the storage means as they are and restarts them. When the machining state is restored according to the recording data and program of the machining processing thread saved when machining is interrupted, the return means 4 executes the machining program from the interrupted location of the machining program and resumes machining.

  Next, the interrupt machining method of the present invention will be described taking wire cut electric discharge machining as an example. First, the machining thread is activated to decode one block of the machining program (S1). The machining thread stores information necessary for machining, such as machining program information and information indicating the state of the NC device when the machining program is decoded.

  If the decoded block is an instruction to end the processing, the processing ends (S2). If the decoded block is not a command to end the processing, the one block is executed according to the active processing thread (S8). Then, the next block is decoded (S1).

  When there is an interrupt processing request from the operator (S3), it is checked whether or not disconnection recovery is possible in the decoded block (S4). The disconnection recovery is to return to the cut position when the wire electrode is cut in the middle of the machining in the wire cut electric discharge machining so that the machining can be performed again. When it is not wire cut electric discharge machining, the judgment of disconnection return is not performed.

  When disconnection recovery is possible, processing is interrupted at a position where disconnection recovery is possible at the beginning of the block, and a disconnection recovery waiting state is set (S5). The disconnection waiting state is recorded as one piece of information indicating the NC state in the memory of the machining thread. When it is impossible to recover from the disconnection, it is checked whether or not it is a position where machining can be interrupted (S6). If the command is not capable of interrupt processing, one block is executed (S8). If the command can be interrupted, the processing is interrupted. When the processing is interrupted, the interrupt processing shown in FIG. 3 is performed (S7).

  In the interrupt processing, first, the active processing thread is saved (S11). Specifically, machining process thread saving means that all recorded data indicating the status of the NC apparatus including machining program information recorded in the memory of the machining process thread and the program of the machining process thread are kept in the current state. To store it in the storage means. Therefore, when returning the machining thread, machining can be resumed in the state where the machining thread is saved from the interrupted location.

  For example, in the case of multi-piece machining in the wire cut electric discharge machining shown in FIG. 4, when there is a request for interruption machining while machining the point B, the wire electrode is connected in the vicinity of the point A or the point C to connect the point C Suppose that it is possible to recover from disconnection. In that case, the process is performed up to point C, the wire electrode is cut, the process is interrupted, and a disconnection recovery waiting state is set. Then, the machining thread is saved while waiting for disconnection recovery, and the state of the NC device and the machining thread program at the time of interruption are stored. If the disconnection cannot be restored at the point C, the position of the command that can be interrupted is the point A, so each block is executed up to the point A, the processing is interrupted, and the processing thread is saved.

  Next, a processing thread for interrupt processing is activated to decode and execute the processing program for interrupt processing (S12). In the interrupt processing, one block of the interrupt processing processing program is decoded in accordance with the interrupt processing processing thread (S13). If the decoded block is not a command to end processing (S14), it is checked whether there is a request for interrupt processing (S15). If there is no request for interrupt processing, one block is executed (S20).

  When there is a request for interrupt processing from the operator (S15), it is checked whether or not disconnection recovery is possible in the decoded block (S16). When it is not wire cut electric discharge machining, the judgment of disconnection return is not performed. When the disconnection can be restored, the wire electrode is cut at the position of the head portion of the block, the processing is interrupted (S17), and the interrupt processing is performed (S19). When it is impossible to recover from the disconnection, it is checked whether or not it is a position where the machining can be interrupted (S18). If the command is not capable of interrupt processing, one block is executed (S20). If the command is capable of interrupt processing, the wire electrode is cut at a predetermined position to interrupt the processing, and interrupt processing is performed (S19).

  If the decoded block is a command to end processing (S14), the processing thread for interrupt processing is ended (S21). Then, the processing thread that has been saved is returned (S22). Specifically, the return of the machining thread refers to reading the machining thread recording data and the machining thread program stored when the machining thread was saved and restarting the machining thread. It is. Then, the machining state is returned to the original position by moving to the interrupted location according to the stored recording data. When it is necessary to return the disconnection, the wire electrode is connected at a predetermined position and returned to the position where the processing is interrupted. When the machining state is returned to the original state, the machining program is executed from the location where the machining program is interrupted in accordance with the stored recording data, one block is executed, and the interrupted machining is resumed (S8).

  For example, in the case of multi-piece machining in the wire cut electric discharge machining shown in FIG. 4, when the machining is interrupted by cutting to the point C and cutting the wire electrode, the wire electrode is connected in the vicinity of the point A or the point C. Then, it is moved to the point C and the disconnection is restored. Then, processing for one block that has been interrupted from the point C is resumed. Further, when the processing is interrupted by cutting to the point A and cutting the wire electrode, the processing state is returned to the original state by moving to the point A. After moving to point A, the interrupted one block is processed and moved to the next machining start point. Then, the wire electrode is connected at the processing start point to process the next processing shape.

  As described above, the interrupt processing method of the present invention saves the recorded data and the program in the memory of the processing thread that is decoding and executing the program as it is, and interrupts the processing thread for interrupt processing. Is started, interrupt processing is performed, and processing is resumed by returning the processing thread that has been saved after the end of interrupt processing. Therefore, it is not necessary to create a temporary file, interrupt processing can be performed when there is no fast-forward command, or during the middle of a subprogram, and the waiting time for interrupt processing is shortened.

  The present invention is used for a numerically controlled machine tool. In particular, it is used in a numerically controlled wire cut electric discharge machining apparatus. According to the present invention, when there is a request for interrupt processing during execution of a processing program, interrupt processing is performed, and when the interrupt processing is completed, the processing state can be restored and the interrupted processing can be resumed.

It is a block diagram which shows a part of numerical control apparatus of the numerical control machine tool of this invention. It is a flowchart which shows the interruption processing method of this invention. It is a flowchart which shows an interruption process among the interruption process methods shown by FIG. It is a figure which shows the process example of wire cut electrical discharge machining.

Explanation of symbols

1 Processing interruption means 2 Retreat means 3 Interrupt processing means 4 Return means

Claims (3)

When there is a request for interrupt processing during execution of the processing program, processing interrupt means for executing the processing program and interrupting processing up to a program block capable of interrupt processing, and decoding and executing the processing program in the storage unit as it current state and recording data indicating the state of the NC apparatus the processing threads of a program when decrypting the machining program is retracted the processing thread comprises information processing program recorded in a memory The saving means, the interruption processing means for starting the interruption processing thread for decoding and executing the interruption processing machining program, and the interruption means for performing interruption machining, and the saving means stored in the storage means when the interruption machining is completed The saved recording data and the saved processing thread program are saved Numerically controlled machine having a return means for resuming the interrupted optionally machining after machining state is returned to the original in accordance with processing thread that has been said retracted to return the processing thread that has been said retracted Te Mayomidashi . When there is a request for interrupt machining during execution of the machining program, the machining program is executed up to a program block capable of interrupt machining, the machining is interrupted, and the machining processing thread that decodes and executes the machining program is executed. The recorded data indicating the status of the NC device including the machining program information saved in the memory and the machining thread program are stored in the storage means as they are, and the machining program for interrupt machining is decoded and executed. The processing thread is activated to perform interrupt processing, and when the interrupt processing is completed, the saved recording data stored in the storage unit by the saving unit and the saved processing thread are stored. program to return the processing thread that has been said retracted reading as being the sheltering The interrupt processing method characterized by resuming the processing which has been returned interrupted accordance processing thread had the machining state based. If there is a request for interrupt machining during the execution of a machining program, if it is possible to recover from disconnection in wire-cut electrical discharge machining in the decoded program block, machining is interrupted at the beginning of the program block and disconnection recovery is performed. When it is impossible, the machining program is interrupted by executing the machining program up to a program block capable of interrupt machining, and the machining program recorded in the memory is saved by evacuating the machining thread that is decoding and executing the machining program. The recorded data indicating the state of the NC device including the information and the program of the machining process thread are stored in the storage means as they are, and the machining process thread that decodes and executes the machining program for interrupt machining is activated to perform interrupt machining. the performed, is stored in the storage means shunting means when the interrupt processing is completed Oita based on machining state in accordance with the retracted is to return the processing thread that has been said retracted and the recording data has been said retracted once was processing threads of a program is read directly processed thread is the sheltering An interrupt processing method characterized in that the processing is resumed.

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