JP4654937B2 - Numerical control apparatus, numerical control method, and computer program - Google Patents

Description

  The present invention relates to a numerical control apparatus, a numerical control method, and a computer program that can execute only a desired part without changing the machining program when only a part of the machining program is to be executed.

  In the numerical control device, there is a case where it is necessary to partially rework after machining is completed, or there is a case where the machining range is limited and partial machining is performed. For example, when a tool is damaged during automatic operation, it is necessary to re-execute only the machined portion of the damaged tool.

  In particular, in a production line for mass production, it is difficult to immediately detect a tool breakage. Therefore, when a tool breakage is discovered, it is necessary to rework all the workpieces that have been machined without being noticed, after machining dozens or hundreds of workpieces with an already damaged tool. The order of the return man-hour cannot be ignored.

In order to solve such a problem, conventionally, machining was performed correctly on an unmachined workpiece by re-execution from a process in the middle of a machining program by a sequence number search function, a program restart function, or the like. . In addition, a judgment symbol that specifies whether or not to skip the block is added to the block of the machining program, and the machining program is executed while ignoring the block designated for block skipping when the machining program is executed. Thus, partial re-execution of the machining program was realized (see Patent Document 1).
Japanese Patent No. 3660038

  However, when using the above-described sequence number search function and program restart function, it is necessary to specify the sequence number to be re-executed every time the machining program is started, and work for specifying the sequence number for each machine tool occurs. There is a problem that it is difficult to reduce the number of man-hours for reworking.

  In addition, in the method of specifying blocks to be skipped, it is necessary to specify which blocks to skip by modifying the machining program. Therefore, there is a problem in that the machining program update operation is complicated and causes a human error such as forgetting to return the machining program.

  The present invention has been made in view of such circumstances, and a numerical control device, a numerical control method, and a computer that can re-execute a machining program only for a portion that needs to be re-executed without correcting the machining program. The purpose is to provide a program.

Numerical control device according to the first invention to achieve the above object, the numerical controller for controlling the operation of the machine tool according to a machining program, and terminates the execution start position 置及 beauty executed to start the execution of the machining program storage means for storing instructions to perform the end position and execution start position of said machining program, when executing the machining program from the execution start position, read instructions to the execution start position of the machining program from said storage means Te, part of the machining program to the after be executed from the start position were return operation to a state that can correspond to the run end position from the instruction corresponding to the execution start position of the machining program instructions And a program execution means for executing only the program.

  The numerical control device according to a second aspect of the present invention is characterized in that, in the first aspect, the execution start position and the execution end position are specified based on information of a tool replacement instruction instructing tool replacement. To do.

  The numerical control device according to a third aspect of the present invention is characterized in that, in the second aspect, the information on the tool change command is information for identifying the type of the tool.

  The numerical control device according to a fourth aspect of the present invention is the numerical control device according to the third aspect, wherein the execution end position includes information identifying a tool type different from information identifying the tool type specified at the execution start position. It is a change command, or a command immediately before the tool change command.

  In the numerical controller according to a fifth aspect of the present invention, in the third aspect, the execution start position is specified based on the number of pieces of information identifying the type of tool described in the machining program. And

  In the numerical control device according to a sixth aspect of the present invention, in the second aspect, the execution end position is specified based on the number of pieces of information identifying the type of tool described in the machining program after the execution start position. It is characterized by being.

  The numerical control device according to a seventh aspect of the invention is characterized in that, in the first aspect, the execution start position and the execution end position are specified based on a sequence number of an instruction described in the machining program. To do.

  According to an eighth aspect of the present invention, in the first aspect, the execution start position and the execution end position are designated based on a block number of the machining program.

The numerical control method according to a ninth invention, in a numerical control method for controlling the operation of the machine tool according to a machining program execution ending position and said ends the execution start position 置及 beauty executed to start the execution of the machining program An instruction to the execution start position of the machining program is stored in the storage means, and when the machining program is executed from the execution start position, the instruction to the execution start position of the machining program is read from the storage means, and the machining After performing a return operation in which the program can be executed from the execution start position, only the part from the instruction corresponding to the execution start position to the instruction corresponding to the execution end position of the machining program is executed. It is characterized by that.

The computer program according to the first 0 invention is a computer program that can be executed by the numerical controller for controlling the operation of the machine tool according to a machining program, said numerical controller starts to execute the machining program means for storing in the storage means an instruction to the execution end position and execution start position of the machining program ends the execution start position 置及 beauty run, and from the execution start position when performing a machining program, the machining program Corresponding to the execution start position of the machining program after performing a return operation that reads the command to the execution start position from the storage means and makes the machining program executable from the execution start position Means for executing only the part from the instruction to the instruction corresponding to the execution end position. It is characterized by functioning.

In the first invention, the ninth invention, and the tenth invention, the execution start position for starting the execution of the machining program and the execution end position for ending the execution are stored in the storage means, and the execution start position is stored from the storage means. The execution end position is read, and only the part from the instruction corresponding to the execution start position of the machining program to the instruction corresponding to the execution end position is executed. By storing the execution start position and execution end position in the storage means, it is not necessary to update the machining program, and human errors such as forgetting to return the machining program can be avoided in advance. It is possible to reliably specify the execution end position. Therefore, it is possible to re-execute only the part that needs to be re-executed without causing the machining program to be updated. In addition, when a command to the execution start position of the machining program is stored in the storage unit and the machining program is partially executed from the execution start position, the command to the execution start position of the machining program is read from the storage unit, and the machining program is A return operation is performed to enable execution from the execution start position. As a result, the machining program is not simply skipped to the execution start position, but even when the machining program is partially started, the machining program is executed under the same initial conditions as when the previous command was executed. It becomes possible.

  In the second aspect of the invention, the execution start position and the execution end position are designated based on information of a tool change command that instructs tool change. Thereby, when a predetermined tool breaks or the like, the processing part by the tool is specified based on information included in the tool replacement command for supporting the tool replacement, for example, the type of tool, the number of times of replacement, etc. Therefore, it is possible to execute the machining program automatically, avoid performing unnecessary processes, and minimize the return process.

  In the third invention, the information of the tool change command is information for identifying the type of the tool. As a result, when a predetermined tool breaks or the like, the machining program by the tool can be specified based on the type of the tool, so that the machining program can be partially executed and a wasteful process can be executed. As a result, the rework process can be minimized.

  In the fourth invention, the execution end position is a tool change command including information identifying a tool type different from information identifying the tool type specified at the execution start position, or a command immediately before the tool change command. It is. As a result, it is possible to specify a part for partially executing the machining program within a range that does not affect the workpiece, and it is possible to re-execute only the specified part.

  In the fifth invention, the execution start position is designated based on the number of pieces of information for identifying the type of tool described in the machining program. Thereby, the execution start position of the machining program can be specified based on the number of times of machining with the same tool, and for example, it is possible to execute only the machined portion of the tool in which breakage or the like has occurred.

  In the sixth invention, the execution end position is designated based on the number of pieces of information for identifying the type of tool described in the machining program after the execution start position. As a result, the execution end position of the machining program can be specified based on the number of times of machining with the same tool, and for example, only the machined portion of the tool in which breakage or the like has occurred can be executed.

  In the seventh invention, the execution start position and the execution end position are designated based on the sequence number of the instruction described in the machining program. Thereby, the part to be executed in the machining program can be accurately specified, and only the specified part can be re-executed.

  In the eighth invention, the execution start position and the execution end position are designated based on the block number of the machining program. Thereby, the part to be executed in the machining program can be accurately specified, and only the specified part can be re-executed.

  According to the present invention, by storing the execution start position and the execution end position in the storage means, it is not necessary to update the machining program and to avoid human errors such as forgetting to return the machining program. Therefore, the execution end position of the machining program can be specified with certainty. Therefore, it is possible to re-execute only the part that needs to be re-executed without causing the machining program to be updated. In addition, when a predetermined tool breaks by specifying the execution start position and execution end position based on the information identifying the type of tool, the sequence number of the machining program, or the block number, the machining portion by the tool Only the machining program can be executed, the useless process can be avoided, and the reworking process can be minimized.

  Further, according to the present invention, not only the machining program is simply skipped to the execution start position, but even when the machining program is partially started, the same initial condition as when the previous command is executed is used. It is possible to execute below.

  Hereinafter, the present invention will be described with reference to the drawings illustrating embodiments thereof. The embodiment of the present invention is not limited to the following examples, and it goes without saying that the present invention can be implemented in various modes as long as it belongs to the technical scope of the present invention.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration when the numerical control device 1 according to the first embodiment of the present invention is used in a machine tool of three-axis control. In FIG. 1, a numerical controller 1 includes at least a CPU (central processing unit) 11, a ROM 12, a RAM 13, an input / output interface 14, an output interface 20 that outputs signals for controlling driving of various motors to be controlled, and a storage. Means 26 are connected via the internal bus 19. The input / output interface 14 is connected to an input unit 15 such as a mouse and a keyboard, a display unit 16 such as a display, an auxiliary storage unit 17, and a communication unit 18 that performs data communication with the outside.

  The CPU 11 is connected to the hardware units as described above of the numerical controller 1 via the internal bus 19, and controls the hardware units described above, and also processes the machining program 3 or auxiliary storage means 17 stored in the RAM 13. The operation of various devices connected via the output interface 20 is controlled in accordance with the machining program 3 introduced into the RAM 13 using a (portable) recording medium 2 such as a CD-ROM or DVD.

  The RAM 13 is composed of SRAM, flash memory, etc., and stores temporary data generated during execution of software, data necessary for execution of software, and the like. The input means 15 connected via the input / output interface 14 is an input medium such as a keyboard and a mouse provided with character keys, numeric keys, various function keys and the like necessary for operating the numerical control device 1. The display means 16 is a display device such as a liquid crystal display device or a CRT display, and displays an image indicating an operation state of the numerical control device 1, an image for prompting an operation input to the user, and the like. Note that the display means 16 can be substituted for some or all of the various function keys of the input means 15 by adopting a touch panel system for the display means 16. The communication means 18 transmits and receives external data acquisition, external device operation control data, and the like.

  The storage means 26 is a fixed storage device such as a non-volatile memory or a hard disk, and is a partial execution start position of the machining program 3 specified based on information included in a tool change command for instructing tool change. And the execution end position is stored. By controlling the partial execution start position and execution end position of the machining program 3 based on the tool change command, for example, when a predetermined tool breaks, only the command related to the machining portion by the tool is partially re-executed. It is possible to avoid performing a useless process and minimize the rework process.

  The output interface 20 transmits drive signals to drive circuits 21, 21, 21, 21 that drive the X-axis motor 22, the Y-axis motor 23, the Z-axis motor 24, and the main shaft motor 25, respectively.

  Hereinafter, when mass production is performed using a plurality of machine tools equipped with the numerical control device 1 having the above-described configuration, when a part of the tool is broken by one machine tool, machining has already been completed for a large number of workpieces. Have Therefore, it is necessary to perform machining in a normal state again on a workpiece that has already been abnormally machined with a broken tool or the like.

  FIG. 2 is a diagram showing an example of the machining program 3 executed by the numerical control apparatus 1 according to the first embodiment. In the machining program 3 shown in FIG. 2, a tool number “Tn” (n is a natural number), which is information for identifying a tool, is assigned to the tool change command “M6”. The sequence numbers “N10” to “N130” correspond to the block numbers 1 to 13, respectively, and “M30” indicates that the machining program 3 is an end block.

  FIG. 3 is a diagram illustrating an example of execution part specifying information indicating an execution start position and an execution end position when the machining program 3 executed by the numerical control device 1 according to the first embodiment is partially re-executed. . The execution part specifying information is received by the CPU 11 from the user and stored in the storage unit 26. In the example of FIG. 3, the execution start position and the execution end position when the machining program 3 is partially re-executed are specified by the tool number and the sequence number included in the tool change command of the machining program 3.

  When the sequence number is used, a range to be partially executed is specified by the sequence number of the machining program 3. When the tool number is used, a range to be partially executed is specified by a tool change command to the tool number included in the command of the machining program 3. Further, “any” may be used as the execution end position, and the execution may be ended when a tool change command for a tool number other than the tool number specifying the execution start position is detected.

  In the example of FIG. 3, the CPU 11 first interprets the instruction “M8” of the first block, and executes the instruction “M8” of the first block having the sequence number 10 corresponding to the block number 1. The CPU 11 interprets the instruction “M20” in the next block, determines that it does not correspond to the execution end position shown in FIG. 3, and executes the instruction “M20”.

  The CPU 11 interprets the instruction “G54G0X0Y0Z0” of the next block, determines that it corresponds to the execution end position shown in FIG. 3, and does not execute the instruction “G54G0X0Y0Z0”. Similarly, the CPU 11 skips the command up to the tool change command ‘M6T2’ corresponding to the next execution start position, and executes the tool change command ‘M6T2’ that matches the tool number ‘2’. The CPU 11 executes commands up to the tool change command 'M6T3' corresponding to the execution end position. Then, the operation is terminated by 'M30' which is an end block.

  In the above example, the case where the instruction is executed up to the instruction immediately before the execution end position is described. However, the present invention is not particularly limited to this, and the instruction corresponding to the execution end position may be executed. .

  Further, the execution start position and / or the execution end position may be designated based on the number of tool changes described in the machining program. When the execution start position is designated by the number of tool replacements, the execution is started from the command that is read from the first command of the machining program 3 to the tool number corresponding to the effective start position. When the execution end position is designated by the number of tool replacements, a command in which the number of tool replacements from the machining program command after the execution start position to the tool number corresponding to the execution end position is designated, or Execution ends with the previous instruction. Furthermore, when the execution end position is detected to include a tool change to a tool number different from the tool number specified at the execution start position, the tool change instruction including the tool number, or the tool change instruction It may be a command one before. The designation of “any” in the above example corresponds to this. Of course, the number of tool change commands is counted, and the execution start position and the execution end position are specified based on the number of tool change commands so that, for example, the third tool change command to the fifth tool change command are executed. May be.

  FIG. 4 is a diagram illustrating an example of a screen that accepts designation of an execution start position and an execution end position of the machining program 3 when machining is performed again. As shown in FIG. 4, the designation reception screen inputs / displays a machining program display area 41 for displaying commands of the machining program 3 in units of blocks, and an execution start position and an execution end position for partially executing the machining program 3. An execution range input area 42 and an item selection area 43 for receiving selection of which item to specify the execution start position and the execution end position are provided.

  While viewing the machining program displayed in the machining program display area 41, the user determines where or which tool is to be partially re-executed, and sets the execution start position and execution end position in the item selection area 43. Enter the item to be specified. In the example of FIG. 4, when the input value is “0”, the setting is completed. When the input value is “1”, it is set based on the tool number. Similarly, when the input value is ‘2’, it is set based on the sequence number, and when the input value is ‘3’, it is set based on the block number.

  When items specifying the execution start position and the execution end position are input to the item selection area 43, the items to be set are displayed in the execution range input area 42, and the “execution start position” and “execution” fields that are blank are displayed. Enter a value in "End position" according to each item.

  FIG. 5 is a flowchart showing a processing procedure of the CPU 11 when the machining program 3 is partially re-executed by the numerical controller 1 according to the first embodiment of the present invention. The CPU 11 of the numerical controller 1 accepts the selection of the machining program 3 to be executed (step S501), activates the selected machining program 3, and initializes the flag information to ‘0’ (step S502).

  The CPU 11 determines whether or not the execution range is specified (step S503). When the CPU 11 determines that the execution range is not specified (step S503: NO), the CPU 11 executes the machining program for the first time. The command is sequentially executed from the command to the last command (step S504). When the CPU 11 determines that the execution range is designated (step S503: YES), the CPU 11 reads the designated execution range, that is, the execution start position and the execution end position of the machining program 3 (step S505). Then, the commands of the machining program 3 are sequentially interpreted block by block (step S506).

  The CPU 11 determines whether or not the interpreted block instruction is 'M30', that is, whether or not it is an execution end instruction of the machining program 3 (step S507), and the CPU 11 interprets the block instruction that is 'M30'. If it is determined that it is' (step S507: YES), the CPU 11 ends the execution of the machining program 3.

  When the CPU 11 determines that the interpreted block instruction is not 'M30' (step S507: NO), the CPU 11 determines whether the flag information is '0' (step S508). When the CPU 11 determines that the flag information is “0” (step S508: YES), the CPU 11 determines whether or not the interpreted block is an execution start position (step S509).

  When the CPU 11 determines that the interpreted block is not the execution start position (step S509: NO), the CPU 11 returns the process to step S506 and repeats the above-described process. When the CPU 11 determines that the flag information is not “0” (step S508: NO), the CPU 11 determines whether or not the interpreted block is an execution end position (step S510).

  When the CPU 11 determines that the interpreted block is the execution end position (step S510: YES), the CPU 11 sets the flag information to “0” (step S511), and returns the process to step S506. When the CPU 11 determines that the interpreted block is the execution start position (step S509: YES) or when the interpreted block is not the execution end position (step S510: NO), the CPU 11 is interpreted. The block instruction is executed to set the flag information to “1” (step S512). CPU11 returns a process to step S506, and repeats the process mentioned above.

  As described above, according to the first embodiment, by storing the execution start position and the execution end position in the storage unit 26, the machining program 3 need not be updated, and the machining program 3 is forgotten to be returned. The human error can be avoided in advance, and the execution end position of the machining program 3 can be specified with certainty. Therefore, it is possible to re-execute only a portion that needs to be re-executed without causing an update operation of the machining program 3.

(Embodiment 2)
Hereinafter, the numerical controller 1 according to Embodiment 2 of the present invention will be described in detail with reference to the drawings. Since the configuration of the numerical control device 1 according to the second embodiment of the present invention is the same as that of the first embodiment, detailed description thereof will be omitted by attaching the same reference numerals. In the second embodiment, when the machining program 3 is partially executed, the machining program is partially executed after executing the process (return operation) of the previous stage to be partially executed. Is different.

  FIG. 6 is a diagram showing an example of the machining program 3 executed by the numerical control apparatus 1 according to the second embodiment. In the machining program 3 shown in FIG. 6, the machining program 3 for drilling using the drill cycle 'G81' is taken as an example. The sequence numbers “N10” to “N150” correspond to the block numbers 1 to 15, respectively, and “M30” indicates that the machining program 3 is an end block.

  FIG. 7 is a diagram illustrating an example of execution part specifying information indicating an execution start position and an execution end position when the machining program 3 executed by the numerical control device 1 according to the second embodiment is partially re-executed. . The execution part specifying information is received by the CPU 11 from the user and stored in the storage unit 26. In the example of FIG. 7, the execution start position and the execution end position when the machining program 3 is partially re-executed are designated by the block number of the machining program 3.

  In the example of FIG. 7, the CPU 11 first interprets the instruction “M6T1G54” in the first block, determines that the block number 1 does not correspond to the execution start position shown in FIG. 7, and stores the return operation information in the storage unit 26. . The CPU 11 interprets the instruction “M8” in the next block, determines that it does not correspond to the execution start position shown in FIG. 7, and stores the return operation information in the storage unit 26.

  Similarly, the CPU 11 sequentially interprets the block instructions, determines that the block number 7 corresponds to the execution start position shown in FIG. Y-20. Return operation is executed to execute '. Specifically, the tool is changed to the tool 1, the M8 signal is output, the spindle is set to 1000 revolutions, and X-10. Y-10. Z-50. Move to. Then, the drill cycle G81 is set in the operating state.

  The CPU 11 sends the instruction 'X-20. Y-20. 'And execute the instruction' X-30. Y-30. 'And interprets that it does not correspond to the execution end position shown in FIG. Y-30. 'Is executed. The CPU 11 interprets the instruction ‘G0X0Y0Z50’ of the next block, determines that it corresponds to the execution end position shown in FIG. 7, and stores the return operation information in the storage unit 26. Specifically, instructions until the next execution start position are stored in the storage means 26. In the same manner, after executing the return operation based on the return operation information always stored in the storage means 26 before executing the command, the command corresponding to the execution start position is executed. Thereby, not only the machining program 3 is simply skipped to the execution start position, but even when the machining program 3 is partially started, the same initial conditions as those when the previous command is executed are: For example, it can be executed according to the position and state of the tool.

  In the above-described example, the case of executing up to the instruction at the execution end position has been described. However, the present invention is not particularly limited to this, and the instruction is executed up to the instruction just before the execution end position. May be.

  In addition, as with the first embodiment, there are various variations in the method for specifying the execution start position and the execution end position. The user may specify the item according to the situation from the same screen as in FIG.

  FIG. 8 is a flowchart showing a processing procedure of the CPU 11 when the machining program 3 is partially re-executed by the numerical controller 1 according to the first embodiment of the present invention. The CPU 11 of the numerical controller 1 accepts the selection of the machining program 3 to be executed (step S801), activates the selected machining program 3, and initializes the flag information to ‘0’ (step S802).

  The CPU 11 determines whether or not the execution range is specified (step S803), and when the CPU 11 determines that the execution range is not specified (step S803: NO), the CPU 11 executes the machining program for the first time. The command is sequentially executed from the instruction to the last instruction (step S804). When the CPU 11 determines that the execution range is designated (step S803: YES), the CPU 11 reads the designated execution range, that is, the execution start position and the execution end position of the machining program 3 (step S805). Then, the instructions of the machining program 3 are sequentially interpreted one block at a time (step S806).

  The CPU 11 determines whether or not the interpreted block instruction is 'M30', that is, whether or not it is an execution end instruction of the machining program 3 (step S807), and the CPU 11 interprets the block instruction as 'M30'. If it is determined that it is' (step S807: YES), the CPU 11 ends the execution of the machining program 3.

  When the CPU 11 determines that the interpreted block instruction is not 'M30' (step S807: NO), the CPU 11 determines whether or not the flag information is '0' (step S808). When the CPU 11 determines that the flag information is “0” (step S808: YES), the CPU 11 determines whether or not the interpreted block is the execution start position (step S809).

  If the CPU 11 determines that the interpreted block is not the execution start position (step S809: NO), the CPU 11 stores the interpreted block in the storage means 26 as return operation information (step S810), and the process proceeds to step S806. Return and repeat the process described above. When the CPU 11 determines that the flag information is not “0” (step S808: NO), the CPU 11 determines whether or not the interpreted block is an execution end position (step S811).

  When the CPU 11 determines that the interpreted block is the execution end position (step S811: YES), the CPU 11 sets the flag information to “0” (step S812) and stores the interpreted block as the return operation information. It memorize | stores in the means 26 (step S813), returns a process to step S806, and repeats the process mentioned above. When the CPU 11 determines that the interpreted block is the execution start position (step S809: YES), the CPU 11 executes the return operation according to the return operation information stored in the storage unit 26 (step S814). After the CPU 11 performs the return operation or when it is determined that the interpreted block is not the execution end position (step S811: NO), the CPU 11 executes the command of the interpreted block and sets the flag information to “1”. Setting is made (step S815). CPU11 returns a process to step S806, and repeats the process mentioned above.

  As described above, according to the second embodiment, not only the machining program 3 is simply skipped to the execution start position, but even when the machining program 3 is partially started, instructions up to that point are executed. It is possible to execute under the same initial conditions as those performed.

It is a block diagram which shows the structure in the case of using the numerical control apparatus which concerns on Embodiment 1 of this invention for the machine tool of 3-axis control. It is a figure which shows an example of the processing program performed with the numerical control apparatus which concerns on this Embodiment 1. FIG. It is a figure which shows an example of the execution part specific information which shows the execution start position and execution end position in the case of partially re-executing the processing program performed with the numerical control apparatus which concerns on this Embodiment 1. FIG. It is a figure which shows an example of the screen which receives designation | designated of the execution start position and execution end position of a process program in the case of performing a process again. It is a flowchart which shows the process sequence of CPU in the case of partially re-executing a machining program with the numerical control apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the machining program performed with the numerical control apparatus which concerns on this Embodiment 2. FIG. It is a figure which shows an example of the execution part specific information which shows the execution start position and execution end position in the case of partially re-executing the processing program performed with the numerical control apparatus which concerns on this Embodiment 2. FIG. It is a flowchart which shows the process sequence of CPU in the case of partially re-executing a machining program with the numerical control apparatus which concerns on Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Numerical control apparatus 2 Storage medium 3 Processing program 11 CPU
12 ROM
13 RAM
15 Input means 16 Display means 26 Storage means

Claims (10)

In a numerical control device that controls the operation of a machine tool according to a machining program,
Storage means for storing instructions to perform the start of the run end position and the machining program ends the execution start position 置及 beauty executed to start the execution of the machining program,
When executing the machining program from the execution start position, the instruction to the execution start position of the machining program is read from the storage unit, and the machining program can be executed from the execution start position. after the operation, the numerical control device, characterized in that it comprises a program execution unit for executing only part up instruction corresponding to the execution ending position from the instruction corresponding to the execution start position of the machining program.   The numerical control device according to claim 1, wherein the execution start position and the execution end position are specified based on information of a tool replacement command that instructs tool replacement.   The numerical control device according to claim 2, wherein the information on the tool change command is information for identifying a type of a tool.   The execution end position is a tool change command including information for identifying a tool type different from the information for identifying the tool type specified at the execution start position, or a command immediately before the tool change command. The numerical control apparatus according to claim 3.   The numerical control device according to claim 3, wherein the execution start position is specified based on the number of pieces of information for identifying the type of tool described in the machining program.   The numerical control device according to claim 2, wherein the execution end position is specified based on the number of pieces of information for identifying the type of tool described in the machining program after the execution start position.   The numerical control device according to claim 1, wherein the execution start position and the execution end position are specified based on a sequence number of an instruction described in the machining program.   The numerical control device according to claim 1, wherein the execution start position and the execution end position are specified based on a block number of the machining program. In a numerical control method for controlling the operation of a machine tool according to a machining program,
The store instructions until the execution start of the run end position and the machining program ends the execution start position 置及 beauty executed to start the execution of the machining program storage means,
When the machining program is executed from the execution start position, an instruction to the execution start position of the machining program is read from the storage unit so that the machining program can be executed from the execution start position. After the return operation is performed, only the part from the command corresponding to the execution start position to the command corresponding to the execution end position of the machining program is executed. In a computer program that can be executed by a numerical control device that controls the operation of a machine tool according to a machining program,
The numerical control device,
Means for storing in storage means the execution ending position and the instruction to the execution start position of the machining program ends the execution start position 置及 beauty executed to start the execution of the machining program, and
When the machining program is executed from the execution start position, an instruction to the execution start position of the machining program is read from the storage unit so that the machining program can be executed from the execution start position. A computer program that functions as means for executing only a part from an instruction corresponding to the execution start position to an instruction corresponding to the execution end position of the machining program after performing a return operation .

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