JP2009110223A - Numerical control device, numerical control program, and storage medium storing numerical control program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a numerical control device stopping driving of a predetermined spindle to operate a machine tool. <P>SOLUTION: A main spindle flag is set to "1" when there is an "M300" command in a machining program. The main spindle flag is set to "0" when there is an "M301" command. A table flag is set to "1" when there is an "M302 " command. The table flag is set to "0" when there is an "M303" command. If the main spindle flag is "1" and the table flag is "1" (S31: Yes and S32: Yes), the rotation of the main spindle and the movement of the table are forbidden to carry out processing. If the main spindle flag is "1" and the table flag is "0" (S31: Yes and S32: No), the rotation of the main spindle is forbidden to carry out processing. If the main spindle flag is "0" and the table flag is "1" (S31: No and S33: Yes), the movement of the table is forbidden to carry out processing. If both the main spindle flag and table flag are "0" (S31: No and S33: No), processing is carried out as usual according to instructions. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a numerical control device, a numerical control program, and a storage medium storing the numerical control program, and more particularly, a numerical control device and a numerical control program for operating a machine tool by stopping driving of a predetermined axis. And a storage medium storing a numerical control program.

Conventionally, there has been a demand for stopping the driving of only a specific axis and operating a machine tool. For example, it is a machine tool having a thermal displacement correction function for a main shaft and a feed shaft. In a machine tool having a thermal displacement correction function, thermal displacement correction is performed using parameters. Therefore, in order to determine the parameter, the machining program is actually repeatedly executed, the amount of thermal displacement is measured, and the parameter is calculated (see, for example, Patent Document 1). Here, the thermal displacement of the spindle head and the feed shaft with respect to the ball screw is generated by the rotation of the shaft, and the parameters are determined for each axis on which the thermal displacement occurs. Therefore, only the main shaft is driven to measure the thermal displacement amount by the main shaft, or only the feed shaft is driven to measure the thermal displacement amount by the feed shaft. The amount of thermal displacement varies depending on the rotation time and rotation speed of the shaft, and varies depending on the machining program for machining the product. Therefore, it is necessary to measure the amount of thermal displacement for each machining program and determine the parameters for correcting the thermal displacement. Therefore, in order to determine the parameters of each axis, it is necessary to measure the amount of thermal displacement when only a specific axis is driven for each machining program. Therefore, conventionally, a machining program for measurement driven only by the spindle or a machining program for measurement driven only by the feed axis is created from the machining program, and the measurement machining program is repeatedly executed to measure the amount of thermal displacement. And parameters were determined.
JP-A-11-90780

  However, creating a measurement machining program from a machining program is very time consuming, and if there is an error in the measurement machining program, there is a problem that an accurate thermal displacement cannot be measured and a preferable parameter cannot be determined. . In addition, it is difficult to create a measurement machining program that operates only the main axis in an operation in which the rotation of the main axis and the rotation of the Z axis (the axis in the direction in which the main axis and the workpiece face each other) are synchronized as in tapping. There was a problem that there was.

  The present invention has been made to solve the above-described problems, and includes a numerical control device that stops driving a predetermined axis and operates a machine tool, a numerical control program, and a storage medium that stores the numerical control program. The purpose is to provide.

  In order to solve the above-described problem, in the numerical control device according to the first aspect of the present invention, a numerical value for numerically controlling a machine tool that operates a tool held by a spindle and processes a workpiece fixed to a jig based on a processing program. A control device, which is instructed by shaft drive means for driving a predetermined axis of the machine tool based on a command described in the machining program, and a drive prohibition command for prohibiting driving of the predetermined axis by the machining program If it is, drive inhibition control means for controlling the shaft drive means not to be driven is provided.

  Further, in the numerical control device according to the second aspect of the present invention, in addition to the configuration of the first aspect, the predetermined axis is one of the main axis and a feed axis for moving the workpiece. It is characterized by being at least one.

  In addition, in the numerical control device of the invention according to claim 3, in addition to the configuration of the invention of claim 1 or 2, when a drive prohibition release command for canceling the drive prohibition command is instructed by the machining program Includes a drive prohibition canceling unit that cancels the control that does not drive the shaft driving unit by the drive prohibition control unit.

  Further, in the numerical control device according to the fourth aspect of the invention, in addition to the configuration of the invention according to any one of the first to third aspects, the machining program calls another machining program and executes it as a subprogram. When a subprogram execution command is instructed, subprogram execution means for executing a subprogram that is a called machining program, and when the subprogram is executed by the subprogram execution means, When a program end command for ending the machining program is instructed, conversion means is provided for converting the program end command into a subprogram end command for ending the execution of the subprogram.

  According to a fifth aspect of the present invention, in addition to the configuration of the fourth aspect of the invention, the touch probe for measuring the coordinates of the measurement target position and the touch probe before the subprogram is executed. The reference coordinate acquisition unit that measures the coordinates of the measurement reference position by using the reference coordinate acquisition unit, the reference coordinate storage unit that stores the reference coordinate acquired by the reference coordinate acquisition unit, and the measurement reference position by the touch probe The thermal displacement amount acquisition means that measures the difference from the reference coordinates stored in the reference coordinate storage means as the thermal displacement amount, and stores the thermal displacement amount acquired by the thermal displacement amount acquisition means. The measured thermal displacement storage means, the subprogram execution means for repeatedly executing the subprogram, and the subprogram executed by the subprogram execution means. A thermal displacement amount recording means for acquiring the thermal displacement amount by the thermal displacement amount acquisition means at a predetermined timing and storing the acquired thermal displacement amount in the measured thermal displacement amount storage means during the return execution; The subprogram execution means includes the thermal displacement amount acquired by the thermal displacement amount measuring means until a predetermined value is reached, or the subprogram is executed a predetermined number of times, or a predetermined time has elapsed. The sub-program is repeatedly executed until it is done.

  In the numerical control program according to the sixth aspect of the invention, the computer is operated as various processing means of the numerical control apparatus according to any one of the first to fifth aspects.

  A computer-readable storage medium according to a seventh aspect stores the numerical control program according to the sixth aspect.

  In the numerical control device according to the first aspect of the present invention, when the drive prohibiting command for prohibiting the driving of the predetermined axis is instructed by the machining program, the shaft driving means can be controlled not to be driven. . Therefore, even if a machining program that does not drive the predetermined axis is not created, it is possible to control the predetermined axis not to be driven only by writing a drive prohibition command in the machining program. Therefore, there is no need to create a machining program that does not drive a predetermined axis. Further, even in an operation in which a plurality of axes rotate at the same time, only a predetermined axis can be prevented from being driven.

  In addition, in the numerical control device according to the second aspect of the present invention, in addition to the effect of the first aspect, at least one of the predetermined shaft, the main shaft, and the feed shaft for moving the workpiece is provided. Since only one spindle can be used, it is possible to make only the spindle not to operate or to make only the feed axis not to operate. Therefore, in the workpiece machining by the machining program, the machine tool can be numerically controlled based on the machining program without operating at least one of the main shaft and the feed shaft that are closely related to the accuracy of the workpiece.

  In addition, in the numerical control device of the invention according to claim 3, in addition to the effect of the invention according to claim 1 or 2, when a drive prohibition release command for canceling the drive prohibition command is instructed by a machining program Can cancel the control that does not drive the shaft drive means by the drive prohibition control means. Therefore, the drive of the shaft can be stopped only when it is not desired to drive the predetermined shaft, and the drive prohibition can be canceled and the shaft can be driven when the drive is desired.

  Further, in the numerical control device according to the fourth aspect of the invention, in addition to the effect of the invention according to any one of the first to third aspects, when the subprogram is executed, the machining program is terminated by the subprogram. When a program end command is instructed, the program end command can be converted into a subprogram end command for ending the execution of the subprogram. At the end of the machining program, a program end command for terminating the execution of the machining program is described. When calling a machining program in a machining program and executing it as a subprogram, if there is a “program end command” in the machining program (subprogram) that is a subprogram, not only the subprogram is terminated. Then, the machining program that called the subprogram is terminated, and the numerical control for the machine tool is terminated. Therefore, it is necessary to describe not the “program end command” but the “subprogram end command for ending the execution of the subprogram” in the machining program as the subprogram. However, in the numerical control device according to the fourth aspect of the present invention, when the machining program is executed as the subprogram, the “program end command” can be converted into the “subprogram end command”. Therefore, when it is desired to execute the machining program as a subprogram, it is not necessary to change the “program end command” of the machining program to the “subprogram end command”. Furthermore, it is possible to prevent an unnecessary change from being made to the machining program due to an unexpected part being changed by mistake or being erased by not handling the machining program.

  In addition, in the numerical control device according to the fifth aspect of the invention, in addition to the effect of the fourth aspect of the invention, the thermal displacement amount is acquired and acquired at a predetermined timing while the subprogram is repeatedly executed. The measured thermal displacement amount can be stored in the measured thermal displacement amount storage means. Therefore, after giving an instruction to prohibit driving of a predetermined axis by a drive prohibition command, a machining program is created that causes a machining program for measuring the amount of thermal displacement to be executed as a subprogram. Then, by performing numerical control of the machine tool based on this machining program, it is possible to measure the thermal displacement amount of a predetermined axis of a certain machining program.

  In the numerical control program according to the sixth aspect of the present invention, the computer can be operated as various processing means of the numerical control apparatus according to any one of the first to fifth aspects. Therefore, the same effect as that of any one of claims 1 to 5 can be obtained.

  A computer-readable storage medium according to a seventh aspect of the invention can store the numerical control program according to the sixth aspect. Therefore, the same effect as that of the invention described in claim 6 can be obtained, and the same effect as that of the invention described in any of claims 1 to 5 can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The numerical control device 1 (see FIG. 1) of the present embodiment is a device that processes a workpiece (workpiece) using a tool. The numerical control device 1 fixes a workpiece to a table, and a spindle on which a tool is mounted is disposed opposite the table. Then, the work is machined by moving the table to align the machining target position with the tool position and actuating (rotating, raising and lowering) the tool. As for the moving direction of the table, the direction approaching the tool is defined as the Z-axis direction, and the two directions perpendicular to the plane perpendicular to the Z-axis direction are defined as the X-axis direction and the Y-axis direction. Then, the table is moved in the X-axis direction and the Y-axis direction, the machining position of the workpiece on the XY plane is determined, and the distance to the tool is determined by moving in the Z-axis direction. This table movement command and tool operation command are described in the machining program (see FIG. 3), and the tool is moved and operated by interpreting the machining program line by line.

  Here, the electrical configuration of the numerical controller 1 will be described with reference to FIG. FIG. 1 is a block diagram showing an electrical configuration of the numerical controller 1. As shown in FIG. 1, the numerical control device 1 is provided with a CPU 10 that controls the numerical control device 1. The CPU 10 is a processor that is the center of control of the entire numerical controller 1, and is connected to the ROM 11, the input interface 13, the output interface 12, the RAM 14, and the flash memory 18 via the bus 20. The ROM 11 stores a control program for controlling the numerical control device 1. The CPU 10 reads the control program from the ROM 11, and this control program reads the machining program loaded in the machining program storage area 145 of the RAM 14. To process the workpiece. The flash memory 18 is provided with a thermal displacement amount storage area in which the measured thermal displacement amount is stored.

  A keyboard 15, a start switch 16, and a touch probe 17 are connected to the input interface 13. The keyboard 15 can input various information to the numerical controller 1. The start switch 16 is a switch for instructing execution of the machining program. When turned ON, the machining program is read and a command is executed for each line. The touch probe 17 is attached to the spindle and acquires the coordinates of the measurement target position. The output interface 12 includes a drive circuit 21 for driving an X-axis motor 31 for moving the tool in the X-axis direction, a drive circuit 22 for driving a Y-axis motor 32 for moving the tool in the Y-axis direction, A drive circuit 23 for driving the Z-axis motor 33 for moving the tool in the Z-axis direction, a drive circuit 24 for driving the spindle motor 34 for rotating the spindle, and a control circuit 25 for controlling the display device 35 are connected. ing. The flash memory 18 is provided with a thermal displacement amount storage area 181.

  Next, a storage area provided in the RAM 14 will be described with reference to FIG. FIG. 2 is a schematic diagram showing a storage area provided in the RAM 14. As shown in FIG. 2, the RAM 14 is provided with a spindle flag storage area 141, a table flag storage area 142, a sub flag storage area 143, and a work storage area 144. The spindle flag storage area 141 stores a spindle flag. The spindle flag prohibits the operation of the spindle when “1” is stored. When “0” is stored, the operation of the spindle is not prohibited. The operation of the main shaft means that the main shaft motor 34 is not rotated. A table flag storage area 142 stores a table flag. The table flag prohibits the operation of the table when “1” is stored. When “0” is stored, the operation of the table is not prohibited. The operation of the table means that the X-axis motor 31, the Y-axis motor 32, and the Z-axis motor 33 are not rotated. A sub flag is stored in the sub flag storage area 143. When the subflag is “1” or more, it indicates that the subprogram is being executed. If the subflag is “1”, it indicates that the subprogram of the first layer called by the main machining program is being executed. If it is “2”, 2 is called by the subprogram of the first layer. This indicates that the subprogram in the hierarchy is being executed. When “0” is stored, it indicates that the subprogram is not being executed.

  Next, the machining program will be described with reference to FIG. FIG. 3 is a schematic diagram of a machining program. As shown in FIG. 3, the machining program defines operations of tools and tables with one line as one block. In FIG. 3, a code is assigned to each block. A block in the first row is a block 101, a block in the second row is a block 102,..., And a block in the 22nd row is a block 122. The machining program shown in FIG. 3 is a machining program for all 22 lines. “# 100” described in the blocks 101, 104, and 109 and “# 101” described in the blocks 102, 113, and 118 are variables used in this machining program. These variables are stored with a storage area secured in the work storage area 144 of the RAM 14. The code (N code) beginning with “N” described in the blocks 103, 111, and 120 is a code for specifying a location in the machining program.

  The M code “M98” described in the blocks 105, 107, 114, and 116 is a code for instructing execution of the subprogram. As shown in blocks 105 and 114, “M98 P1000” indicates that the subprogram “P1000” is executed once. Further, “M98 P500 L10” described in the blocks 107 and 116 indicates that the subprogram “P500” is repeatedly executed 10 times. “GOTO” described in the blocks 104, 110, 113, and 119 indicates that the process proceeds to the position of the number described thereafter. “GOTO 10” in the block 104 indicates that the process proceeds to the block “N10”, that is, the block 111. “IF [# 100 GT 10]” described in the block 104 indicates a condition “if the variable # 100 becomes larger than 10”. Therefore, the block 104 indicates that “if the variable # 100 becomes larger than 10, proceed to the block N10”. Similarly, the block 113 indicates that “if the variable # 101 becomes larger than 10, proceed to the block N30”.

  Then, “G04” described in the blocks 112 and 121 indicates to wait for the number of seconds designated by the number following “X”. Blocks 112 and 121 indicate 90000 seconds, that is, waiting for 2 hours and 30 minutes. The M code “M30” indicates the end of the machining program.

  Next, the four M codes that are the main part of the present invention will be described. “M300” is a command for prohibiting the operation of the spindle, and “M301” is a command for canceling the prohibition of the operation of the spindle. After the “M300” command is issued, the spindle motor 34 is not rotated until the “M301” command is issued. “M302” is a command for prohibiting the operation of the table, and “M303” is a command for canceling the prohibition of the table operation. After the “M302” command is issued, the X-axis motor 31, the Y-axis motor 32, and the Z-axis motor 33 are not rotated until the “M303” command is issued.

  Next, with reference to FIG.4 and FIG.5, the operation | movement performed when the numerical control apparatus 1 runs a control program in CPU10 is demonstrated. 4 and 5 are flowcharts showing the operation of the control program. The control program is executed when the start switch 16 is turned on.

  First, “0” is stored in the spindle flag storage area 141, the table flag storage area 142, and the sub flag storage area 143 of the RAM 14, and the spindle flag, table flag, and sub flag are cleared to OFF (S1). Next, one block is read (S2), and it is determined whether or not there is an M code in the read block (S3). If there is no M code (S3: NO), the process proceeds to S21 and an instruction execution process is performed (S21). In this instruction execution process, a process according to the instruction described in the block is executed.

  As shown in FIG. 5, in the instruction execution process, first, if the spindle flag is “1” (S31: YES) and the table flag is “1” (S32: YES), the rotation of the spindle and the movement of the table are also performed. Is also prohibited. Therefore, the block instruction read in S2 is executed while prohibiting the rotation of the spindle and the movement of the table. Specifically, when performing processing according to the instruction content, the drive circuit 21 that drives the X-axis motor 31, the drive circuit 22 that drives the Y-axis motor 32, the drive circuit 23 that drives the Z-axis motor 33, the spindle Instructions are not given to the drive circuit 24 that drives the motor 34. If the spindle flag is “1” (S31: YES) and the table flag is not “1” (S32: NO), only the rotation of the spindle is prohibited. Therefore, in response to the block instruction read in S2, the processing is executed while prohibiting the rotation of the spindle. Specifically, when the various drive circuits 21 to 25 are controlled in accordance with the contents of the instructions, instructions are not given to the drive circuit 24 that drives the spindle motor 34.

  Further, when the spindle flag is not “1” (S31: NO) and the table flag is “1” (S33: YES), only the movement of the table is prohibited. Therefore, in response to the block instruction read in S2, the table movement is prohibited and the process is executed (S36). Specifically, when the various drive circuits 21 to 25 are controlled in accordance with the instruction contents, the drive circuit 21 that drives the X-axis motor 31, the drive circuit 22 that drives the Y-axis motor 32, and the Z-axis motor 33 are driven. An instruction is not given to the driving circuit 23 to be operated. If neither the spindle flag nor the table flag is “1” (S31: NO, S33: NO), nothing is prohibited, and processing according to the instruction is executed as usual (S37). When the instruction execution process ends (S21), the process returns to S2 and the next block is read (S2).

  If there is an M code (S3: YES), a flag process is performed according to the content of the M code, and then a process instructed by the M code is performed. First, it is determined whether or not it is “M30” (S4). If it is “M30” (S4: YES), it is necessary to terminate this control program. However, if the block being processed is a subprogram, it is necessary not to end the control program but to return to the machining program that called the subprogram. Therefore, it is determined whether or not the sub flag is “1” or more (S13). If the sub flag is “1” or more (S13: YES), it can be determined that the sub program is being executed and that “M30” is instructed in the sub program. Therefore, “1” is subtracted from the subflag (S14), and the subprogram is terminated (S15). At the end of the subprogram, the next block of the machining program that called the subprogram is designated as the next block to be read. Then, the process returns to S2, and the next block is read (S2). On the other hand, if the sub flag is not “1” or more (S13: NO), since the instruction is “M30” from the main machining program, the control program is terminated.

  If the M code is “M99” (S5: YES), the end of the subprogram is instructed. Therefore, “1” is subtracted from the subflag (S14), and the subprogram is terminated (S15). The next block of the machining program that called the subprogram is designated as the next block to be read. Then, the process returns to S2, and the next block is read (S2). When the M code is not “M99” (S5: NO) and “M98” (S6: YES), the start of the subprogram is instructed. Therefore, “1” is added to the subflag (S16). Then, a process according to the instruction described in the block in S21 is executed (S21). Specifically, since the start of the subprogram is not related to spindle rotation and table movement, regardless of the values of the spindle flag and table flag (S31: YES, S32: YES, S31: YES, S32: NO, S31: NO, S33: YES, S31: NO, S33: NO), the subprogram start command is executed (S34, S35, S36, S37). Here, the next block to be read is the first block of the subprogram. Then, the process returns to S2, and the first block of the subprogram is read (S2).

  When the M code is not “M98” (S6: NO) and is “M300” (S7: YES), “1” is stored in the spindle flag (S17). That is, the operation of the spindle is prohibited. Then, an instruction execution process is performed (S21). In the instruction execution process, when a code other than “M300” is described, a process corresponding to the code is performed. In the example shown in FIG. 3, only “M300” is described in the block 106, and there is no other command, so the processing is not executed. When the M code is not “M300” (S7: NO) and “M301” (S8: YES), “0” is stored in the spindle flag (S18). That is, the prohibition of the operation of the spindle is released. Then, an instruction execution process is performed (S21). In the instruction execution process, when a code other than “M301” is described, a process corresponding to the code is performed. In the example shown in FIG. 3, since only “M301” is described in the block 108, there is no other command and the process is not executed.

  If the M code is not “M301” (S8: NO) and “M302” (S9: YES), “1” is stored in the table flag (S19). That is, the operation of the table is prohibited. Then, an instruction execution process is performed (S21). In the instruction execution process, when a code other than “M302” is described, a process corresponding to the code is performed. In the example shown in FIG. 3, since only “M302” is described in the block 115, there is no other command and the process is not executed. If the M code is not “M302” (S9: NO) and “M303” (S10: YES), “0” is stored in the table flag (S20). That is, the prohibition of the table operation is released. Then, an instruction execution process is performed (S21). In the instruction execution process, when a code other than “M303” is described, a process corresponding to the code is performed. In the example shown in FIG. 3, since only “M303” is described in the block 117, there is no other command and the process is not executed.

  When the command execution process is performed (S21), the process returns to S2, the next block is read (S2), and the processes of S3 to S20 are repeated. If “M30” is instructed during execution of the main machining program other than during the subprogram execution (S4: YES, S13: NO), the control program ends.

  As described above, in the control program, the spindle flag or the table flag is updated when there is a command of “M300”, “M301”, “M302”, or “M303”. As a result, if “M300” is described in the block before the command of the process in which the spindle is not desired to be operated in the machining program, the spindle does not operate with the command. If the command “M301” is described in the machining program, the operation of the spindle can be restored. Furthermore, if “M302” is described in the block before the command of the processing that does not want to move the table in the machining program, the table does not move with the command. Further, if the command “M303” is described in the machining program, the table movement can be restored. Therefore, it is possible to flexibly respond to user requests.

  Further, when the command “M30” is issued in the subprogram, the control program is not terminated, but the same processing (S14, S15) as the subprogram termination command “M99” is performed. This eliminates the need for the user to change the machining program “M30” to “M99” when the machining program is to be executed as a subprogram. Therefore, the machining program desired to be executed without driving a predetermined axis can be directly executed as a subprogram without any modification. Therefore, when the user changes to “M99”, there is no risk of making a mistake of changing or deleting another block.

  Next, the operation of the control program will be described using the machining program shown in FIG. 3 as a specific example. First, the spindle flag, table flag, and sub flag are cleared (S1). The spindle flag = 0, the table flag = 0, and the sub flag = 0. Then, the block 101 “# 100 = 0” is read (S2), and since there is no M code (S3: NO), an instruction execution process is performed (S21). Since the spindle flag = 0 (S31: NO) and the table flag = 0 (S33: NO), the instruction is executed without any restriction, and the variable 100 is set to 0 (S37). Then, the process returns to S2, and the block 102 “# 101 = 0” is read (S2). Since there is no M code (S33: NO), the spindle flag = 0 (S31: NO), and the table flag = 0 (S33: NO), the instruction is executed without any restriction, and the variable 101 = 0 (S37). ). Then, the block 103 “N20” is read (S2). Since there is no M code (S33: NO), spindle flag = 0 (S31: NO), and table flag = 0 (S33: NO), the instruction is executed without any restrictions, but “N20” is a position designation. Since there is no command, there is no actual processing (S37).

  Then, returning to S2, the block 104 “IF [# 100 GT 10] GOTO 10” is read (S2). Since there is no M code (S33: NO), the spindle flag = 0 (S31: NO), and the table flag = 0 (S33: NO), the instruction is executed without any restriction (S37). Specifically, the variable 100 is referred to and compared with “10”. Here, since the variable 100 = 0, nothing is done. Then, the block 105 “M98 P1000” is read (S2). It is an M code (S33: YES). And it is "M98" (S4: NO, S5: NO, S6: YES). Therefore, “1” is added to the subflag to become “1” (S16). Since the spindle flag = 0 (S31: NO) and the table flag = 0 (S33: NO), the P1000 subprogram is read and started without any restrictions. Specifically, the next block to be read is the first block of P1000. This P1000 is a machining program for measuring the amount of thermal displacement. Although not shown, in the machining program of P1000, the tool change of the spindle is instructed and the touch probe is attached. When P1000 is executed for the first time as in this case, the coordinates of the measurement position are acquired by the touch probe and stored as “reference coordinates” in the thermal displacement amount storage area 181 of the flash memory 18. From the second time on, the tool change of the spindle is instructed, the touch probe is attached, the coordinates of the measurement position are acquired by the touch probe, and the difference from the “reference coordinates” is calculated. Then, the calculated value is stored as “thermal displacement amount” in the thermal displacement amount storage area 181 of the flash memory 18.

  Therefore, when returning to S2, the first block of P1000 is read. And the process of S3-S20 is performed according to the instruction | indication of P1000. Then, the processes of S2 to S21 are repeated until “M30” or “M99” is instructed in P1000. If the last block of P1000 is “M30” (S4: YES), the subflag is “1” and is “1” or more (S13: YES), so the subflag is subtracted by “1” to become “0”. (S14). Then, the subprogram P1000 is terminated (S15). Here, the block to be read next is the block (block 106) next to the block from which the subprogram is read out of the main machining program. In the example of FIG. 3, the block 106 is a block to be read next. In the executed subprogram “P1000”, the coordinates of the measurement position are acquired and stored in the work storage area 144 of the RAM 14 as “reference coordinates”.

  Then, the process returns to S2 and the main machining program block 106 “M300” is read out. Since it is an M code (S3: YES) and “M300” (S4: NO, S5: NO, S6: NO, S7: YES), the spindle flag is set to “1” (S17). Since the spindle flag = 1 (S31: YES) and the table flag = 0 (S32: NO), rotation of the spindle is prohibited and other commands are executed (S35). However, since “M300” is a spindle drive prohibition command and there is no command to drive the machine tool, there is no processing actually performed. Next, the block 107 “M98 P500 L10” is read. Since it is an M code (S3: YES) and “M98” (S4: NO, S5: NO, S6: YES), “1” is added to the subflag to become “1” (S16). Since the spindle flag = 1 (S31: YES) and the table flag = 0 (S32: NO), the spindle control is prohibited, and the P500 subprogram is read and started. Specifically, the next block to be read is the first block of P500, and the number of executions is the first. Although not shown, this P500 is a machining program for machining a workpiece in a machine tool.

  When the first P500 machining program is started and the process returns to S2, the first block of P500 is read out. And the process of S3-S21 is performed according to the instruction | indication of P500. And the process of S2-S21 is repeated until "M30" or "M99" is instruct | indicated in P500. If the last block of P500 is “M30” (S4: YES), since the sub flag is “1” and is “1” or more (S13: YES), the sub flag is subtracted by “1” to become “0”. (S14). Then, the subprogram P500 is terminated (S15). In block 107, “L10” is given, and an instruction to repeat the subprogram is performed 10 times. Therefore, when the number of executions is less than 10, “1” is added to the subflag, The subprogram is started. That is, the next block to be read out is the first block of P500.

  Then, the first block of P500 is read. And the process of S3-S21 is performed according to the instruction | indication of P500. And the process of S2-S21 is repeated until "M30" or "M99" is instruct | indicated in P500. Further, the processes of S2 to S21 are repeated until the number of executions reaches 10. In P500 executed ten times, since the spindle flag = 1, no instruction is given to the drive circuit 24 that drives the spindle motor 34 when the instruction is executed (S35). When “M30” is read in the tenth P500 (S4: YES), the subflag is “1” (S13: YES), so “1” is subtracted from the subflag to become “0” (S14). . Then, the subprogram P1000 is terminated (S15). Here, since the execution of 10 times of P500 has been completed, the next block to be read is the next block (block 108) of the main machining program and the block from which the subprogram has been read.

  Then, the block 108 “M301” is read. Since it is an M code (S3: YES) and “M301” (S4: NO, S5: NO, S6: NO, S7: NO, S8: YES), the spindle flag is set to “0” (S18). . Since the spindle flag = 0 (S31: NO) and the table flag = 0 (S33: NO), the command is executed without any restrictions (S35). However, “M301” is a spindle drive prohibition release command and there is no command to drive the machine tool, so there is no actual processing. Here, since the spindle flag is set to "0" (S18), in the subsequent processing, an instruction is given to the drive circuit 24 that drives the spindle motor 34.

  Then, the block 109 “# 100 = # 100 + 1” is read (S2). Since there is no M code (S3: NO), spindle flag = 0 (S31: NO), and table flag = 0 (S33: NO), the command is executed without any restrictions, and “1” is added to the variable 100. It is set to “1” (S37). Returning to S2, the block 110 “GOTO 20” is read (S2), there is no M code (S3: NO), the spindle flag = 0 (S31: NO), and the table flag = 0 (S33: NO). The command is executed without any restriction, and the next block to be read is the block next to the block of “N20”, that is, the block 104 (S37).

  Then, the block 104 “IF [# 100 GT 10] GOTO 10” is read (S2). Since there is no M code (S3: NO), the spindle flag = 0 (S31: NO), and the table flag = 0 (S33: NO), the instruction is executed without any restriction (S37). Here, the variable 100 = 1 and is not greater than 10, so nothing is done. Then, the process returns to S2 and the block 105 “M98 P1000” is read (S2). Until the variable 100 becomes larger than “10”, the processes of the block 104 to the block 110 are repeatedly performed. When the variable 100 becomes larger than “10”, the block to be read next is set to the next block of “N10”, that is, the block 112 in the process of the block 104 (S37). That is, a series of processes in which P500 is continuously executed 10 times in a state where the thermal displacement amount is recorded by P1000 and the driving of the spindle is prohibited is performed 10 times. Therefore, the thermal displacement amount is recorded in a state where the driving of the main shaft is prohibited, that is, in a state where only the X axis, the Y axis, and the Z axis for table movement are driven.

  Then, the block 112 “G04X9000” is read (S2). Since there is no M code (S3: NO), the spindle flag = 0 (S31: NO), and the table flag = 0 (S33: NO), the instruction is executed without any restriction (S37). Since “G04X9000” is a command to wait for 9000 seconds, it waits for 9000 seconds. Thereby, the thermal displacement generated by the execution of block 104 to block 110 is recovered. When 9000 seconds have elapsed, the process returns to S2.

  The next block 113 “IF [# 101 GT 10] GOTO 30” is read (S2). Hereinafter, the processing of the block 113 to the block 121 is similar to the processing of the block 104 to the block 112, and thus the description is cited. In block 106, driving of the main shaft is prohibited by “M300”, but in block 115, driving of the table, that is, driving of the X, Y, and Z axes is prohibited. A variable 101 is used instead of the variable 100. Therefore, a series of processes in which P500 is executed ten times in a state where the thermal displacement amount is recorded by P1000 and the driving of the X axis, the Y axis, and the Z axis is prohibited are performed ten times. Therefore, the amount of thermal displacement is recorded in a state where the driving of the X axis, the Y axis, and the Z axis is prohibited, that is, only the main shaft is driven. The block 121 “G04X9000” waits for 9000 seconds. Thereby, the thermal displacement generated by the execution of block 113 to block 119 is recovered. When 9000 seconds have elapsed, the process returns to S2.

  Then, since the block 122 “M30” is read (S2), is M code (S3: YES), is “M30” (S4: YES), and the subflag = 0 (S13: NO), the control program is finish.

  As described above, by incorporating the command “M300” into the machining program, it is possible to prevent the spindle from being driven in subsequent commands. Then, by incorporating the command “M301”, the prohibition of driving of the spindle can be released. Further, by incorporating the command “M302”, the driving of the X axis, Y axis, and Z axis for driving the table can be prohibited. Then, by incorporating the command “M303”, the prohibition of driving the X axis, the Y axis, and the Z axis can be canceled. Therefore, the machining program can be executed without driving the predetermined axis without modifying the machining program. Therefore, there is no time and effort to modify the machining program. In addition, it is difficult to create a machining program that does not drive only a predetermined axis for a complicated command in which a plurality of axes are driven at the same time. The machining program can be executed without driving only.

  In the above embodiment, the drive circuits 21 to 24 shown in FIG. 1 correspond to the “axis drive means”. The process of storing “1” in the spindle flag in accordance with “M300” in S7 and S17 shown in FIG. 4, the process of storing “1” in the table flag in accordance with “M301” in S9 and S19, and shown in FIG. In the command execution process, the CPU 10 that performs the process of executing the command by prohibiting the movement of the table and the rotation of the spindle according to the values of the spindle flag and the table flag corresponds to the “drive inhibition control means”. The CPU 10 that performs the process of storing “0” in the spindle flag in accordance with “M301” in S8 and S18, and the process of storing “0” in the table flag in accordance with “M303” in S10 and S20 is “drive prohibition canceling means”. Is equivalent to.

  In the machining program shown in FIG. 3, the CPU 10 that first executes the block 105 to acquire the coordinates of the measurement target position, and the CPU 10 that first executes the block 114 to acquire the coordinates of the measurement target position It corresponds to “acquiring means”. Further, the CPU 10 that executes the block 105 after the second time to acquire the coordinates of the measurement target position, and the CPU 10 that executes the block 114 after the second time and acquires the coordinates of the measurement target position becomes the “thermal displacement amount acquisition means”. Equivalent to. The thermal displacement amount storage area 181 of the flash memory 18 corresponds to “reference coordinate storage means” and “measured thermal displacement amount storage means”. The CPU 10 that executes the command “M98 P500 L10” in the blocks 107 and 116 corresponds to the “subprogram execution means”. Then, the CPU 10 that executes the processing of the blocks 101, 103, 104, 105, 107, 109, and 110, and the CPU 10 that executes the processing of the blocks 102, 113, 114, 116, 118, and 119 serve as the “thermal displacement amount recording means”. Equivalent to.

  The numerical control device of the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the scope of the present invention. In the above embodiment, the spindle drive prohibition command code is “M300”, the spindle drive prohibition release command code is “M301”, the table drive prohibition command code is “M302”, and the table drive prohibition release command code is “M303”. However, it goes without saying that the codes of these commands are not limited to this. In addition, the set of the main axis, the X axis, the Y axis, and the Z axis is given as an example as the predetermined axis, but the axis that prohibits driving is not limited thereto. Further, although the X-axis, Y-axis, and Z-axis are prohibited by set as table driving, a drive prohibition command code and a drive prohibition release command code may be set so as to prohibit each axis.

  In the above embodiment, the drive prohibition command code is used in the thermal displacement amount measurement. However, the drive prohibition command may not be used for the thermal displacement amount measurement. For example, a Z-axis prohibition command that prohibits only the Z-axis may be used in a dry run for confirming the operation of the machining program.

  Further, in the above embodiment, when an instruction of “M30 (machining program end)” is given in the subprogram using the subflag, it is handled in the same manner as “M99 (subprogram end)”. However, this function is not necessarily provided.

  In the machining program illustrated in the above embodiment (see FIG. 3), the thermal displacement amount is measured (execution of P1000) every time the subprogram is repeatedly executed 10 times, but the thermal displacement amount is measured. The timing to do is not limited to this. For example, the number of executions of the subprogram need not be ten. Further, the number of executions of the subprogram may be increased as time elapses from the start of measurement. Alternatively, the amount of thermal displacement may be measured at a predetermined time by measuring time. At that time, the measurement time may be increased as time elapses.

2 is a block diagram showing an electrical configuration of the numerical control device 1. FIG. 3 is a schematic diagram showing a storage area provided in a RAM 14. FIG. It is a schematic diagram of a processing program. It is a flowchart which shows operation | movement of a control program. It is a flowchart which shows operation | movement of a control program.

Explanation of symbols

1 Numerical control device 10 CPU
21 drive circuit 22 drive circuit 23 drive circuit 24 drive circuit 31 X-axis motor 32 Y-axis motor 33 Z-axis motor 34 spindle motor 141 spindle flag storage area 142 table flag storage area 143 subflag storage area

Claims (7)

A numerical control device for operating a tool held by a spindle and numerically controlling a machine tool that processes a workpiece fixed to a jig based on a processing program,
Shaft driving means for driving a predetermined axis of the machine tool based on a command described in the machining program;
Drive prohibit control means for controlling the shaft drive means not to be driven when a drive prohibit command for prohibiting driving of a predetermined axis is instructed by the machining program. Numerical control unit.   The numerical control apparatus according to claim 1, wherein the predetermined axis is at least one of the main axis and a feed axis for moving the workpiece.   When a drive prohibition release command for canceling the drive prohibition command is instructed by the machining program, drive prohibition canceling means for canceling control that does not drive the shaft driving means by the drive prohibition control means is provided. The numerical control apparatus according to claim 1 or 2, wherein Subprogram execution means for executing a subprogram that is a called machining program when a subprogram execution command for invoking the other machining program and executing it as a subprogram is instructed by the machining program;
When the subprogram is executed by the subprogram execution means, when a program end command for ending the machining program is instructed by the subprogram, the program end command is used to end the execution of the subprogram. 4. The numerical control apparatus according to claim 1, further comprising conversion means for converting into a subprogram end command. A touch probe that measures the coordinates of the measurement target position;
Before executing the subprogram, measure the coordinates of the measurement reference position by the touch probe, and a reference coordinate acquisition means as a reference coordinate;
Reference coordinate storage means for storing the reference coordinates acquired by the reference coordinate acquisition means;
A thermal displacement amount acquisition unit that measures the coordinates of the measurement reference position by the touch probe and uses a difference from the reference coordinates stored in the reference coordinate storage unit as a thermal displacement amount;
Measured thermal displacement amount storage means for storing the thermal displacement amount acquired by the thermal displacement amount acquisition means;
Subprogram execution means for repeatedly executing the subprogram;
While the subprogram is repeatedly executed by the subprogram execution unit, the thermal displacement amount is acquired by the thermal displacement amount acquisition unit at a predetermined timing, and the acquired thermal displacement amount is stored in the measured thermal displacement amount. Thermal displacement amount recording means for storing in the means,
The subprogram execution unit is configured to execute the subprogram until a predetermined value is reached, until the subprogram is executed a predetermined number of times, or until a predetermined time elapses. The numerical control apparatus according to claim 4, wherein the subprogram is repeatedly executed.   A numerical control program for operating a computer as various processing means of the numerical control device according to any one of claims 1 to 5.   A computer-readable storage medium storing the numerical control program according to claim 6.

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