JP2017157194A - Numerical controller for machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a numerical controller for a machine tool which improves a real-time property and is capable of performing proper processing operation at a high execution speed.SOLUTION: A numerical controller comprises: an analysis section 72 for analyzing a processing program and each of multiple auxiliary programs; a command element extraction section 74 for judging the presence/absence of relevancy between the auxiliary programs; a load calculation section 76 for calculating processing times of the processing program and each of the multiple auxiliary programs; an execution order calculation section 78 for calculating an execution order of the processing program and the multiple auxiliary programs in such a manner that the auxiliary programs having mutual relevancy are executed within the same execution cycle; and an execution processing section 80 for executing the processing program and the auxiliary programs in the calculated execution order.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a numerical control device for a machine tool. More specifically, the present invention executes a machining program at a predetermined execution cycle and at least one auxiliary program among a plurality of auxiliary programs within the execution cycle of the machining program. The present invention relates to a numerical control device of a machine tool that executes a program.

  The present applicant has already started a machining process according to a program repeatedly executed periodically, such as a sequence program for performing sequence control of a multi-axis machine tool, and controls the motion (motion) of each axis. Numerical values that allow both axis motion (motion) control and sequence control to be executed easily without requiring a special device to convert the program to be executed by describing all NC programs in the NC program format. The control device was successfully developed and patented (see Patent Document 1).

  In addition, for example, in the control software, a control software execution system that can be executed efficiently by giving flexibility to a method for specifying a task to be executed and giving an appropriate processing time to each task. A control method has been proposed (see Patent Document 2).

  In this connection, it is possible to obtain a parallel scheduling result for a program with a large number of tasks in a short time by extracting a task having a large difference in task processing time depending on the program execution condition as an analysis target. A parallel scheduling device has also been proposed (see Patent Document 3).

  Furthermore, in the method of giving priority to processes and preferentially processing high priority processes, among the multiple execution stages for each unit time, programs are executed in order from the execution stage with the highest priority until the end of the unit time. Also proposed is a program execution processing method and apparatus capable of improving the processing capacity by fully utilizing the CPU capacity when a large number of programs are executed by allocating resources necessary for execution of the program. (See Patent Document 4).

Japanese Patent No. 3764436 Japanese Patent No. 3727637 Japanese Patent No. 5381302 Japanese Patent No. 5469128

  In the control system of a conventional numerical control device, when an automatic cutting device is taken as an example, processing of non-cutting time from a processing program consisting of cutting time for actual processing and non-cutting time for performing preparatory operation and measurement of processing, etc. By removing the program and executing the machining program related to the excluded non-cutting time within the execution period of the automatic operation of the machining program related to the cutting time for actually performing machining, the cycle time with respect to the execution period of the machining program Can be shortened.

  That is, in such a control system of a numerical control device, processing of a program that acquires position information, signal information, and the like and realizes a desired machining operation is performed according to the state of automatic driving. Accordingly, in the execution processing of the machining program, real-time performance is required, and processing operation needs to be performed at a high-speed execution cycle.

  An execution process that satisfies the real-time property and needs to be completed within the execution cycle will be described with reference to FIG. In the following, a program for performing machining preparation operation and measurement is referred to as an auxiliary program, and only a program for actually performing machining is referred to as a machining program. Here, FIG. 8 is an explanatory diagram showing a state in which the auxiliary program executed within the execution cycle of the machining program completes the execution process within the execution cycle in the conventional numerical control device.

  In FIG. 8, “automatic operation execution processing” indicates an execution processing state related to automatic operation of the machine tool by the machining program, and “auxiliary program 1 execution processing”, “auxiliary program 2 execution processing”, “auxiliary program 3 execution processing”. "" Indicates an execution processing state of the auxiliary program executed within the execution cycle of the machining program.

  In this case, if the number of applications to be operated increases during the execution process of automatic operation by the machining program as the machining of the machine tool is advanced, naturally the execution process to be completed within the execution cycle Increase. Therefore, if the execution process is not completed within the execution cycle, the system will be down, so that it is necessary to reduce the load of the process executed within the increasing execution cycle to avoid this.

  FIG. 9 shows an example of mitigating the load of processing executed within the increasing execution cycle. In this case, “auxiliary program 3 execution processing” is executed in the next execution cycle, the load in the execution cycle is simply leveled, and the execution processing of auxiliary program 1 and auxiliary program 2 that can be processed in the execution cycle is performed. The execution process of the auxiliary program 3 as an increased load is shifted to the next execution cycle to reduce the load within the initial execution cycle.

  FIG. 10 is an explanation related to the execution process of the auxiliary program 3. In this case, the execution process of a highly relevant auxiliary program is illustrated. For example, an application that executes “auxiliary program 3” using the operation result of “auxiliary program 1” among “auxiliary program 1”, “auxiliary program 2”, and “auxiliary program 3” that are individually executed. When the “auxiliary program 3” is executed in the next execution cycle by reducing the processing load as shown in FIG. 9, the variables # 100 and # 101 related to the processing load are included. From the start of “auxiliary program 1” to the completion of “auxiliary program 3” including variables # 100 and # 101 related to the load of the reading process, at least two processing cycles are required for the processes related to variables # 100 and # 101. become. As described above, there is a problem in that the actual machine tool operation is delayed depending on the execution order of the auxiliary programs, and the real-time property is impaired.

  The present invention has been made in consideration of the above-described problems. For a plurality of auxiliary programs executed within the execution cycle of the machining program, the relevance of each auxiliary program is analyzed, and the execution order thereof is determined. It is an object of the present invention to provide a numerical control device for a machine tool that is determined and excellent in real-time property and capable of performing an appropriate processing operation at a high execution speed.

  An aspect of the present invention is a numerical control device for a machine tool that executes a machining program at a predetermined execution cycle and executes one or more auxiliary programs among a plurality of auxiliary programs within the execution cycle, On the basis of the analysis result of the decoding unit for analyzing each of the machining program and the plurality of auxiliary programs, on the basis of the analysis result of the decoding unit, on the basis of the analysis result of the decoding unit A processing time of the machining program and a plurality of processing times of the machining program so that the load calculation unit for calculating the processing time of the machining program and the processing time of each of the plurality of auxiliary programs and the auxiliary program having relevance are executed within the same execution cycle An execution order calculation unit that calculates the execution order of the machining program and the plurality of auxiliary programs according to the processing time of each auxiliary program Provided in accordance with the calculated execution order, the execution processing unit for executing machining programs and auxiliary programs, the.

  According to this configuration, the decoding unit and the command element extraction unit determine whether or not there is a relationship between the plurality of auxiliary programs, while the load calculation unit calculates the processing time of the machining program and the auxiliary program, The execution order of the machining program and the auxiliary program is calculated and executed based on the presence / absence of the property and the processing time of the machining program and the auxiliary program. As a result, it is possible to perform an appropriate process at a high execution speed with excellent real-time performance for executing the auxiliary program.

  In addition, the command element extraction unit extracts variables that are commonly used in two or more auxiliary programs based on the analysis result of the decoding unit, and the auxiliary programs that commonly use the variables are related to each other. You may decide. Thereby, it is possible to accurately determine the relevance between the auxiliary programs.

  Furthermore, the command element extraction unit sets the degree of association between auxiliary programs having higher relevance as the number of variables used in common increases based on the analysis result of the decoding unit, and the execution order calculation unit The execution order may be calculated so that auxiliary programs having high degrees are adjacent to each other.

  Thus, auxiliary programs having a high degree of association have a large number of variables used in common, and the execution speed of the auxiliary programs can be improved by executing these auxiliary programs within the same execution cycle.

  Furthermore, the command element extraction unit sets a priority for determining the execution order between the auxiliary programs having relevance based on the analysis result of the decoding unit, and the execution order calculation unit determines whether the auxiliary programs having high relevance are The execution order may be calculated so that they are adjacent and in the order of priority.

  As a result, among auxiliary programs having relevance, an auxiliary program having a low priority can be processed using the processing result of the auxiliary program having a high priority, so that an execution processing error of the auxiliary program is suppressed. be able to.

  Furthermore, for each auxiliary program that uses variables in common, the command element extractor uses the commonly used variables for writing, or uses the commonly used variables for reading. The priority of the auxiliary program that is used for writing the variables that are used in common, and the priority of the auxiliary program that is used for reading the variables that are used in common You may set it high.

  Thereby, since the variable written by the auxiliary program executed first is read by the auxiliary program executed later, an execution processing error of the auxiliary program can be prevented.

  Further, when the machining program and the auxiliary program are executed in the execution processing unit, the machining program and the auxiliary program have different load calculation units that measure the processing time of the machining program and the processing time of the auxiliary program. The execution order may be reviewed based on the processing time of the machining program and the processing time of the auxiliary program measured by different load calculation units.

  As a result, when the actual processing time measured by a different load calculation unit is different from the processing time calculated by the load calculation unit from the analysis result of the decoding unit, the execution order can be reviewed at any time. Execution order can be set according to time. Therefore, real-time performance of the auxiliary program execution processing can be improved and processing can be performed at a higher speed than the auxiliary program.

  Further, the command element extraction unit extracts a continuation command indicating a command for performing the repetition process based on the analysis result of the decoding unit, and the execution order calculation unit repeatedly executes the auxiliary program having the continuation command in the execution processing unit. The execution order may be calculated so that Thereby, the auxiliary program having the continuation command can be repeatedly executed.

  Furthermore, when an auxiliary program having a continuation command is being executed in the execution processing unit, it has a different load calculation unit that measures the processing time of the auxiliary program having a continuation command. The execution order may be reviewed based on the processing time of the auxiliary program having the continuation command measured by the different load calculation unit.

  The auxiliary program having a continuation command has a different processing time because the load varies depending on the control content that is actually executed every time it is repeatedly executed. Therefore, the load calculation unit calculates the processing time when the load becomes maximum for the auxiliary program having the continuation command. For this reason, the processing time when the auxiliary program having the continuation command is actually executed may be shorter than the processing time calculated by the load calculation unit. By measuring the actual processing time of the auxiliary program having a continuation command by a different load calculation unit and reconsidering the execution order based on the measured processing time, calculating the execution order according to the actual processing time Can do. Therefore, real-time performance of the auxiliary program execution processing can be improved and processing can be performed at a higher speed than the auxiliary program.

  Still further, the execution order calculation unit sets a processing time during which the machining program and the auxiliary program can be executed within the execution cycle as a limit value of the processing load, and the auxiliary program executed within the processing time of the machining program and the execution cycle. The order of execution may be calculated so that the sum of the processing times is equal to or less than the limit value.

  As a result, when the auxiliary program is executed within the machining program execution cycle, the processing of the auxiliary program can be terminated before the next machining program is executed, and system down can be avoided.

  The load calculation unit measures the processing time of the machining program when the machining program is being executed in the execution processing unit, and the execution order calculation unit determines the execution order according to the measured processing time of the machining program. May be calculated.

  Since the auxiliary program is executed after the processing of the machining program is completed, the processing time of the machining program that is executed first is measured, and the auxiliary program that is executed later is measured according to the processing time of the actual machining program. Execution order can be set. Therefore, it is possible to calculate the execution order according to the processing time of the actual machining program. Therefore, real-time performance of the auxiliary program execution processing can be improved and processing can be performed at a higher speed than the auxiliary program.

  According to the present invention, it is excellent in real-time property, and an appropriate processing operation can be performed at a high execution speed.

It is a principal part control system diagram of the numerical control apparatus of the machine tool which executes and processes a plurality of auxiliary programs in the execution cycle of the machining program concerning the present invention. It is a block system diagram of a control system for executing and executing a machining program and a plurality of auxiliary programs according to the present invention. It is explanatory drawing which shows the calculation processing method of the relevance degree, priority, and program load of a some auxiliary program in the numerical control apparatus of this invention. It is explanatory drawing which shows the method of determining the execution order of an auxiliary program based on the example of calculation of the relevance degree of several auxiliary programs shown in FIG. 3, a priority, and a program load. It is explanatory drawing which shows another Example of the calculation processing method of the relevance degree of an auxiliary program, a priority, and a program load in the numerical control apparatus of this invention. It is explanatory drawing which shows the method of determining the execution order of an auxiliary program based on the calculation example of the relevance degree of a some auxiliary program with a continuation command shown in FIG. 5, a priority, and a program load. It is explanatory drawing which shows the review method with respect to determination of the execution order of the auxiliary program with a continuation command shown in FIG. It is explanatory drawing which shows the execution processing state of the auxiliary program which a some auxiliary program completes within an execution period in the conventional numerical control apparatus. It is explanatory drawing which shows the execution processing state of the auxiliary | assistant program by simple leveling in case the some auxiliary | assistant program is not completed within an execution period in the conventional numerical control apparatus. It is explanatory drawing which shows the relationship of several auxiliary programs in the conventional numerical control apparatus.

  A preferred embodiment as a numerical control device for a machine tool according to the present invention will be exemplified and described in detail below with reference to the accompanying drawings.

  FIG. 1 shows a main part control system diagram of a numerical controller for a multi-axis machine tool according to an embodiment of the present invention.

  The numerical control device 10 includes a CPU 12, and the CPU 12 controls each unit of the numerical control device 10. The CPU 12 reads a system program stored in the ROM 14 via the bus 16 and controls each unit of the numerical control device 10 according to the system program. In the ROM 14, various system programs for executing processing in an edit mode and processing for automatic operation necessary for creating and editing a machining program and the like are written in advance. The RAM 18 stores temporary calculation data, display data, various data input by the operator via the LCD / MDI unit 20, and the like.

  The SRAM 22 is backed up by a battery (not shown), and is configured as a non-volatile memory that retains a stored state even when the power of the numerical controller 10 is turned off. The program for measuring the initial position and the program for correcting the thermal displacement of the machine tool, A machining program, which will be described later, read via the interface 24, a machining program input via the LCD / MDI unit 20, and the like are stored.

  The interface 24 is an interface for an external device that can be connected to the numerical controller 10, and is connected to an external device 26 such as an external storage device. A machining program, a thermal displacement measurement program, and the like are read from the external storage device. A PMC (programmable machine controller) 28 controls an auxiliary device or the like on the machine tool side with a sequence program built in the numerical controller 10. That is, in accordance with the M function, S function, and T function commanded by the machining program, necessary signals are converted on the auxiliary device side of these sequence programs and output from the I / O unit 30 to the auxiliary device side. Auxiliary devices such as various actuators are activated by this output signal. In addition, it receives signals from various switches on the operation panel provided in the machine tool body, performs necessary processing, and passes it to the CPU 12.

  Image signals such as the current position of each axis of the machine tool, alarms, parameters, and image data are sent to the LCD / MDI unit 20 and displayed on the display. The LCD / MDI unit 20 is a manual data input device provided with a display, a keyboard and the like, and the interface 32 receives data from the keyboard of the LCD / MDI unit 20 and passes it to the CPU 12.

  The interface 34 is connected to a manual pulse generator 36. The manual pulse generator 36 is mounted on the operation panel of the machine tool so as to precisely position the movable part of the machine tool by controlling each axis by a distributed pulse based on manual operation. used.

  The X and Y axis control circuits 50, 52 and 54 for moving a table (not shown) constituting the machine tool receive the movement commands for each axis from the CPU 12, and servo the commands for each axis. Output to amplifiers 44, 46 and 48. The servo amplifiers 44, 46, 48 receive this command and drive the servo motors 38, 40, 42 of each axis of the machine tool. The servomotors 38, 40, 42 of each axis incorporate a pulse coder (not shown) for position detection, and a position signal from this pulse coder is fed back as a pulse train.

  The spindle control circuit 60 receives a spindle rotation command to the machine tool and outputs a spindle speed signal to the spindle amplifier 58. The spindle amplifier 58 receives the spindle speed signal, rotates the spindle motor 56 of the machine tool at the commanded rotational speed, and drives the tool.

  A position coder 62 is coupled to the spindle motor 56 by a gear or a belt. The position coder 62 outputs a feedback pulse in synchronization with the rotation of the main shaft, and the feedback pulse is read by the CPU 12 via the interface 64. The clock circuit 66 is a clock device adjusted to be synchronized with the current time.

  FIG. 2 shows a block system diagram of a control system for executing a machining program and an auxiliary program in the numerical control device for a machine tool according to the present invention.

  The machining program is a program related to automatic operation processing in which machining is performed by a machine tool, and the auxiliary program is a program related to processing for performing machining preparation operation and measurement. The machining program is executed at a predetermined execution cycle. The auxiliary program is executed within the execution cycle of the machining program.

  A plurality of auxiliary programs are prepared for each process. The plurality of auxiliary programs are normally executed in a predetermined execution order, but the execution order is rearranged according to the relationship between auxiliary programs described later. The auxiliary program includes an auxiliary program that is executed only once according to processing, and there is an auxiliary program that includes a continuation command that is a command that is repeatedly executed. The order of execution of the auxiliary programs is further rearranged based on this continuation command.

  A program 70 shown in FIG. 2 is a machining program and an auxiliary program, and is stored in the SRAM 22. Here, the program 70 is analyzed (program analysis) by the decoding unit 72 in the CPU 12 to create execution data. Next, in the command element extraction unit 74 in the CPU 12, the degree of relevance with other auxiliary programs is determined from the individual auxiliary programs analyzed by the program, and the result is stored in the SRAM 22 as “relevance”. . Further, the command element extraction unit 74 in the CPU 12 determines the “relevance” and the “priority” for determining the execution order between the auxiliary programs having the relevance, and then repeatedly commands during the machining process. The “continuation command” to be expressed is extracted. Data related to these relevance levels, priority levels, and continuation commands may be stored in, for example, the RAM 18 shown in FIG. Further, the processing time of the machining program and the processing time of the auxiliary program are calculated by the load calculation unit 76 in the CPU 12, and the calculation result is stored in the RAM 18.

  Then, the execution order calculation unit 78 in the CPU 12 calculates the execution order of the machining program and the auxiliary program from the “relevance” and “priority”, as well as “processing time” and “continuation command”. When the execution order calculation result is obtained, the processing program and the auxiliary program are executed through the execution processing unit 80 based on the execution order calculated by the execution order calculation unit 78.

  In this case, the processing time of the machining program and the processing time of the auxiliary program are measured by the different load calculation unit 82 for the machining program and the auxiliary program executed by the execution processing unit 80 in the CPU 12, and the execution is performed. The order calculation unit 78 may be fed back and the execution order of the machining program and the auxiliary program may be reviewed as appropriate.

  Next, an embodiment of processing for calculating the execution order of the machining program and the plurality of auxiliary programs will be described.

Example 1
FIG. 3 shows a calculation processing method for the degree of association, priority, and program load of the auxiliary program. The upper part of FIG. 3 shows commands such as statements and variables described in each auxiliary program, the middle part shows variables extracted from each auxiliary program by the command element extraction unit 74, and the lower part shows the relevance and priority of each auxiliary program. Shows degree and program load information.

  The meaning of each instruction of each auxiliary program shown in the upper part of FIG. 3 is as follows. In the present embodiment, the description of the auxiliary program is in the NC program format proposed by the present applicant in the aforementioned Patent Document 1.

|| 1ZDO: Start of auxiliary program 1 # 100 = # 5021: Substitute the machine coordinate value of the X axis (first axis) for # 100 # 101 = # 5022: Machine coordinate of the Y axis (second axis) for # 101 Assign value:
ZEND: End of auxiliary program 1

|| 2ZDO: Start of auxiliary program 2 N1 ...
N2 ...
:
ZEND: End of auxiliary program 2

|| 3ZDO: Start of auxiliary program 3 # 102 = # 100 + # 101: Substitute the addition result of # 100 and # 101 into # 102 N1.
N2 ...
:
ZEND: End of auxiliary program 3

  In the command shown in the upper part of FIG. 3, the command element extraction unit 74 uses variables relating to processing loads used in individual auxiliary programs such as the auxiliary programs 1 to 3 as common data between the auxiliary programs. Search for missing. Specifically, the command element extraction unit 74 extracts variables from the auxiliary programs 1 to 3 from the program analysis result. Next, the command element extraction unit 74 determines whether or not the auxiliary programs are related. In the example shown in FIG. 3, since variable # 100 and variable # 101 of auxiliary program 1 and auxiliary program 3 are common, it is determined that they are highly related (present), and there is no common variable in auxiliary program 2. Relevance is judged to be low (no). Next, in the command element extraction unit 74, the degree of relevance between each auxiliary program and other auxiliary programs is scored and held, and the “relevance” is determined. The higher the relevance, the higher the “relevance”. In this case, since the auxiliary program 1 and the auxiliary program 3 share two variables, the degree of association is set to “2”. Similarly, since the auxiliary program 3 has two variables in common with the auxiliary program 1, the degree of association is set to “2”. On the other hand, since the auxiliary program 2 has no common variable to the auxiliary program 1 and the auxiliary program 3, the degree of association is “0”.

  Next, the auxiliary program that has been determined to be relevant as described above in the command element extraction unit 74 is scored according to whether the variable is used for “read” or “write”, and “priority” "Degree". In this case, normally, since the variable that has been written is read and the next condition determination process is executed, the priority is set so that the execution order of “write” is advanced and the execution order of “read” is delayed. "Degree". That is, in the auxiliary program 1, since the variables # 100 and # 101 are write processes, the priority is “2”. On the other hand, in the auxiliary program 3, since the variables # 100 and # 101 are reading processes, the priority is “−2”.

  Next, the load calculation unit 76 calculates the program load amount. The program load amount is the processing time of the machining program or the processing time of the auxiliary program. That is, the program load is determined with reference to a program load data table (not shown) stored in the SRAM 22, for example, in which the instruction load amount is estimated for each instruction in the analysis stage of the machining program and the auxiliary program. Then, the integrated value is set as the load of one entire program.

  FIG. 4 shows a method for determining the execution order of the auxiliary programs within the machining program execution cycle based on the first embodiment shown in FIG. In FIG. 4, “automatic operation execution processing” indicates an execution processing state related to automatic operation of the machine tool by the machining program, and “auxiliary program 1 execution processing”, “auxiliary program 2 execution processing”, “auxiliary program 3 execution processing”. "" Indicates an execution processing state of the auxiliary program executed within the execution cycle of the machining program.

  As illustrated in FIG. 4, the execution order calculation unit 78 preliminarily defines a processing time during which the machining program and the auxiliary program can be executed within the execution cycle as a processing load limit value. In this case, the processing time of the “automatic operation execution processing” of the machining program is determined as a measured value of the processing load from a measured value of the time from the start to the completion of the command in a different load calculation unit 82.

  Therefore, the execution order calculation unit 78 can execute the auxiliary program 1 and the auxiliary program 3 having high relevance among the auxiliary programs 1 to 3 executed within the execution cycle of the machining program within the same execution cycle. In addition, the execution order is rearranged so as to be adjacent to the auxiliary program having a high degree of association and in the order of high priority (see FIG. 4). That is, the order of execution is machining program → auxiliary program 1 → auxiliary program 3 → machining program → auxiliary program 2, and the execution process of the auxiliary program 2 having a low degree of relevance is routed to the process in the next execution cycle.

  In the execution processing unit 80, according to the execution order determined in this way, the machining program and the auxiliary program are within a range in which the program load of the machining program and the auxiliary program executed in the same execution cycle falls within the processing load limit value. Is executed.

(Example 2)
FIG. 5 shows that the execution processing of the auxiliary program is executed continuously (with a “continuation command”), and executed within the execution cycle of the machining program for the automatic operation execution processing similar to that of the first embodiment described above. The calculation method of the relevance level, priority, and program load of the auxiliary program to be executed is shown. The upper part of FIG. 5 shows the statements and variables described in each auxiliary program, the middle part shows the variables extracted from each auxiliary program by the command element extraction unit 74, and the lower part shows the relevance, priority, program of each auxiliary program Indicates information on load and continuation commands.

  The meaning of each command in the auxiliary program example having the continuation command (see “auxiliary program 3”) of the second embodiment shown in FIG. 5 is as follows. Also in this embodiment, the description of the auxiliary program is in the NC program format proposed by the present applicant in the above-mentioned Patent Document 1.

|| 1ZDO: Start of auxiliary program 1 # 100 = # 5021: Substitute the machine coordinate value of the X axis (first axis) for # 100 # 101 = # 5022: Machine coordinate of the Y axis (second axis) for # 101 Assign value:
ZEND: End of auxiliary program 1

|| 2ZDO: Start of auxiliary program 2 N1 ...
N2 ...
:
ZEND: End of auxiliary program 2

|| 3ZDO: Start of auxiliary program 3 ZEDGE [# 100GE # 102] ZDO: When # 100 becomes # 102 or more, execution from ZDO to ZEND N1 ...
N2 ...
:
ZEND: Execution so far when ZEDGE statement is established ZEND: End of auxiliary program 3

  In the second embodiment in FIG. 5, as in the first embodiment shown in FIG. 3 described above, the relevancy, priority, and program load calculation processing is performed, while the auxiliary program 3 is added with a “continuation command”. Yes. Therefore, the calculation of the relevance and the priority is determined by the relevance of each auxiliary program and the relationship between reading and writing, as in the first embodiment.

  On the other hand, the command element extraction unit 74 adds information to be a “continuation command” in the case of a control statement with condition determination or loop processing for repeatedly executing processing in the auxiliary program. Then, the program load of the auxiliary program having the “continuation command” is searched for a pattern in which the load becomes the largest and is set as the program load.

  FIG. 6 shows a method for determining the execution order within the execution cycle of the auxiliary program having the “continuation command” based on the second embodiment shown in FIG.

  Also in the second embodiment, as in the first embodiment, the execution order calculation unit 78 predefines a processing time during which the machining program and the auxiliary program can be executed within the execution cycle as a processing load limit value. Further, the processing time of the “automatic operation execution processing” of the machining program is determined as a measured value of the processing load from a measured value of the time from the start to the completion of the command in a different load calculation unit 82.

  Therefore, the execution order calculation unit 78 can execute the auxiliary program 1 and the auxiliary program 3 having high relevance among the auxiliary programs 1 to 3 executed within the execution cycle of the machining program within the same execution cycle. The order of execution is rearranged so that auxiliary programs having high relevance are adjacent to each other and in descending order of priority (see FIG. 6). That is, the order of execution is machining program → auxiliary program 1 → auxiliary program 3 → machining program → auxiliary program 2, and the execution process of the auxiliary program 2 having a low degree of relevance is routed to the process in the next execution cycle.

  In the execution processing unit 80, according to the execution order determined in this way, the machining program and the auxiliary program are within a range in which the program load of the machining program and the auxiliary program executed in the same execution cycle falls within the processing load limit value. Is executed.

  In the second embodiment, since the “continuation command” is repeatedly executed within the execution cycle, the auxiliary program execution process is repeatedly performed until the auxiliary program including the “continuation command” is terminated. In the case of a “continuation command”, the actual processing load time may greatly deviate from the program load depending on the control statement that is actually executed.

  Therefore, in the auxiliary program including the “continuation command”, a different load calculation unit 82 measures the processing load time within the execution cycle, uses the measured value, and executes the execution process as shown in FIG. In addition, it is preferable to review the program load.

  FIG. 7 shows a review method for determining the execution order within the execution cycle of the auxiliary program having the “continuation command” based on the second embodiment shown in FIG. 6.

  That is, in the “auxiliary program 3 execution process” including the “continuation command”, when the measured processing load time is small and the program load of the “auxiliary program 2 execution process” falls within the processing load limit value, the execution order is calculated. The unit 78 reviews the execution order so that the “auxiliary program 2 execution process” is operated in the previous execution cycle. That is, the execution order is machining program → auxiliary program 1 → auxiliary program 3 → auxiliary program 2 → machining program. As a result, the execution order can be determined so that the actual processing load time does not deviate from the limit value of the processing load.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and it goes without saying that various design changes can be made without departing from the scope of the present invention.

10 ... Numerical control device 12 ... CPU
14 ... ROM 18 ... RAM
20 ... LCD / MDI unit 22 ... SRAM
30 ... I / O unit 38, 40, 42 ... Servo motor 44, 46, 48 ... Servo amplifier 50, 52, 54 ... Axis control circuit 56 ... Spindle motor 58 ... Spindle amplifier 60 ... Spindle control circuit 70 ... Program 72 ... Decoding Unit 74 ... Command element extraction unit 76 ... Load calculation unit 78 ... Execution order calculation unit 80 ... Execution processing unit 82 ... Different load calculation unit

Claims (10)

A numerical control device for a machine tool that executes a machining program at a predetermined execution cycle and executes one or more auxiliary programs among a plurality of auxiliary programs within the execution cycle,
A decoding unit for analyzing each of the machining program and the plurality of auxiliary programs;
Based on the analysis result of the decoding unit, a command element extraction unit that determines the presence or absence of relevance between the auxiliary programs,
Based on the analysis result of the decoding unit, a load calculation unit that calculates the processing time of the machining program and the processing time of each of the plurality of auxiliary programs,
According to the processing time of the machining program and the processing time of each of the plurality of auxiliary programs, so as to execute the auxiliary programs having the relation to each other within the same execution cycle, An execution order calculation unit for calculating the execution order of the auxiliary program;
An execution processing unit for executing the machining program and the auxiliary program according to the calculated execution order;
A numerical control device for a machine tool comprising: A numerical control device for a machine tool according to claim 1,
The command element extraction unit extracts variables commonly used in two or more auxiliary programs based on the analysis result of the decoding unit, and the auxiliary programs commonly using the variables are A numerical control device for machine tools that is determined to be relevant. A numerical control device for a machine tool according to claim 2,
Based on the analysis result of the decoding unit, the command element extraction unit sets a higher degree of association between the auxiliary programs having the association as the number of variables used in common increases.
The execution order calculation unit is a numerical control device for a machine tool that calculates the execution order so that the auxiliary programs having high relevance are adjacent to each other. A numerical control device for a machine tool according to claim 3,
The command element extraction unit sets a priority for determining an execution order between the auxiliary programs having the relevance based on the analysis result of the decoding unit,
The execution order calculation unit is a numerical control device for a machine tool that calculates the execution order so that the auxiliary programs having a high degree of association are adjacent to each other and the order of priority is high. A numerical control device for a machine tool according to claim 4,
For each of the auxiliary programs that use the variable in common, the command element extraction unit uses the variable that is used in common for writing or reads the variable that is used in common The priority of the auxiliary program that is used in writing the variable that is used in common is used, and the variable that is used in common is used in the reading A numerical control device for a machine tool that is set higher than the priority of the auxiliary program. A numerical control device for a machine tool according to any one of claims 1 to 5,
When the machining program and the auxiliary program are being executed in the execution processing unit, it has a different load calculation unit that measures the processing time of the machining program and the processing time of the auxiliary program,
The execution order calculation unit is a numerical control device for a machine tool that reviews the execution order based on the processing time of the machining program and the processing time of the auxiliary program measured by the different load calculation unit. A numerical control device for a machine tool according to any one of claims 1 to 5,
The command element extraction unit extracts a continuation command indicating a command to perform repeated processing based on the analysis result of the decoding unit,
The execution order calculation unit is a numerical control device for a machine tool that calculates the execution order so that the auxiliary program having the continuation command is repeatedly executed in the execution processing unit. A numerical control device for a machine tool according to claim 7,
When the auxiliary program having the continuation command is being executed in the execution processing unit, the load processing unit has a different load calculating unit that measures the processing time of the auxiliary program having the continuation command,
The execution order calculation unit is a numerical control device for a machine tool that reviews the execution order based on a processing time of the auxiliary program having the continuation command measured by the different load calculation unit. A numerical control device for a machine tool according to any one of claims 1 to 8,
The execution order calculation unit sets a processing time during which the machining program and the auxiliary program can be executed within the execution cycle as a processing load limit value, and is executed within the processing program processing time and the execution cycle. A numerical control device for a machine tool that calculates the execution order so that a total with a processing time of the auxiliary program is equal to or less than the limit value. A numerical control device for a machine tool according to any one of claims 1 to 9,
The load calculating unit measures a processing time of the machining program when the machining program is being executed in the execution processing unit,
The execution order calculation unit is a numerical control device for a machine tool that calculates the execution order according to the measured processing time of the machining program.

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