JP4396554B2 - Numerical control apparatus, numerical control method, and control program - Google Patents

Description

  The present invention relates to a numerical control device, a numerical control method, and a control program for controlling a machine tool such as a lathe and a machining center, and in particular, can adjust an operation speed during an operation of checking for interference of equipment. The present invention relates to a numerical control device, a numerical control method, and a control program.

  For example, a numerical control device for controlling a machine tool such as a lathe or a machining center controls the operation of the machine tool according to the NC machining program and performs machining on the workpiece. NC machining program is coordinate system by preparation function (G function, G code), auxiliary function (M function, M code), spindle function (S code), feed function (F code), tool function (T function), etc. Is a program for controlling the setting of the tool, the movement command of the tool or the workpiece, the rotation of the spindle, etc., and machining the workpiece, and the operation of the machine tool is controlled by being executed by a computer.

  When an NC machining program is newly created or modified, the operation of the tool or workpiece whose operation is controlled is not guaranteed, and the NC machining program is in a state where the operation has not been confirmed. Not complete. When an NC machining program is newly created or modified, conventionally, the operation of a tool or workpiece whose operation is controlled is manually performed to check for the occurrence of interference or the like.

For example, Patent Document 1 discloses an NC machining program operation confirmation device that executes an NC machining program in a manual mode and accelerates or decelerates the moving speed of a tool or a workpiece according to the rotation speed of a manual handle. In Patent Document 1, the operator can switch between the manual mode and the automatic mode. When there is no influence on the interference, the operator is switched to the automatic mode and affects the interference at the speed specified by the NC machining program. In this case, the presence or absence of interference can be confirmed by switching to the manual mode and moving each at a low speed by operating the manual handle.
JP-A-2-212905

  However, in the conventional NC machining program operation confirmation device disclosed in Patent Document 1, the moving speed of the tool or workpiece depends on the operator's mode switching operation and speed setting operation, and for example, switching from the automatic mode to the manual mode. When the timing is delayed, the moving body collides with an obstacle at a high speed, which may cause damage to tools, jigs, workpieces and the like.

  Also, there is a risk that tools, jigs, workpieces, etc. may be damaged by operating the manual handle at a low speed and moving at a high speed at a moving position where it should be confirmed whether the operation is normal. There was a point.

  Furthermore, it is impossible to determine whether tools, jigs, workpieces, etc. interfere with each other during the confirmation operation, and it is also impossible to stop the operation when it is determined that they interfere with each other. There was also a problem that it was not possible to prevent the damage.

  The present invention has been made in view of such circumstances, and a numerical control device and a numerical control method capable of confirming the operation of a tool or the like based on an NC machining program without damaging a tool, jig, workpiece or the like. It is an object to provide a control program.

In order to achieve the above object, a numerical controller according to a first aspect of the present invention includes a plurality of shaft drive units that relatively drive a tool and a workpiece in three mutually perpendicular directions in accordance with a machining program composed of a plurality of instructions. In the numerical control apparatus for controlling the operation of the first, a first determination means for determining the presence or absence of information indicating that the machining program confirms the presence or absence of interference during the operation of the shaft drive unit, and the first determination means When it is determined that there is information indicating that the presence or absence of interference is present, speed setting means for setting the operation speed of the shaft drive unit to a speed slower than the operation speed of the axis drive unit specified by the machining program; a driving means for operating the shaft driving unit at a speed set by the speed setting means, in the shaft drive unit is operated, a second determination means for determining whether the interference for each of the instruction, the second Judgment method A determination result storage unit that stores a result in a storage unit for each command; a third determination unit that determines whether a command of a machining program for operating the shaft driving unit is already executed by the driving unit; If it is determined that the interference is present in the second determination means, and a stop means for stopping the operation of the shaft driving unit, said speed setting means, wherein the instructions already being executed by the third determination means If it is determined that there is no interference based on the determination result of the command stored in the determination result storage means, and if it is determined that there is no interference, the axis the operating speed of the drive unit, characterized in Citea Rukoto to set the speed faster than the previous operating speed.

In the numerical control device according to a second aspect of the present invention, in the first aspect, the shaft driving unit is electrically operated, and the second determining means detects a current value supplied from the shaft driving unit. And a fourth determination means for determining whether or not the current value detected by the current value detection means exceeds a predetermined value, and the current value detected by the fourth determination means exceeds a predetermined value. If it is determined, it is determined that there is interference.

In the numerical control device according to a third aspect of the present invention, in the first or second aspect , the previous operation speed is set by the operation speed of the shaft drive unit specified by the machining program or the speed setting means. It is the operating speed of the shaft drive unit.

Further, the numerical control apparatus according to the fourth invention, in any one of the first to third invention, the determination result of the presence of interference for each instruction, is identified in three axes of movement end point of the shaft driving unit based on the instruction A determination result storage means for storing in a storage means in association with a coordinate value in a coordinate system, a first coordinate value calculation means for calculating a coordinate value of a movement end point of the axis drive unit based on a command to be executed, A determination result extraction unit that extracts a determination result of presence / absence of interference stored in the storage unit based on the calculated coordinate value, and the speed setting unit determines that there is no interference based on the extracted determination result. In this case, the speed of the shaft driving unit is set to be higher than the previous speed.

Further, in any one of the first to third inventions, the numerical control device according to the fifth aspect of the present invention provides a determination result of the presence or absence of interference for each command based on the three axes of the movement start point and the movement end point of the axis driving unit based on the command. A determination result storage means for storing in the storage means in association with the coordinate values in the coordinate system specified in (2), and a second coordinate value for calculating the coordinate values of the movement start point and movement end point of the axis drive unit based on the command to be executed. A coordinate value calculating unit; and a determination result extracting unit that extracts a determination result of presence / absence of interference stored in the storage unit based on the calculated coordinate value, wherein the speed setting unit is based on the extracted determination result When it is determined that there is no interference, the speed of the shaft driving unit is set to be higher than the previous speed.

Further, the numerical control apparatus according to a sixth invention, in any one of the first to third invention, the machining program Yes stored in the first storage means, storing and copying the machining program to another storage means Copying means, instruction specifying information extracting means for extracting information for specifying an instruction to be executed, instruction extracting means for extracting an instruction corresponding to the extracted specifying information from a stored machining program, and execution And a fifth determining means for determining whether or not the extracted instruction matches the extracted instruction, and when the fifth determining means determines that the instructions match, the speed of the shaft drive unit is set to the previous speed. It is characterized in that a higher speed is set.

The numerical control method according to the seventh aspect of the present invention controls operations of a plurality of axis driving units that relatively drive the tool and the workpiece in three orthogonal directions in accordance with a machining program composed of a plurality of instructions. In a numerical control method using a numerical control device, the presence or absence of information indicating that the machining program confirms the presence or absence of interference during operation of the shaft drive unit is determined, and during operation, the presence or absence of interference is determined for each command. The determination result of the presence or absence of interference is stored in the storage means for each command, it is determined whether or not the command of the machining program for operating the shaft driving unit has already been executed, and the presence or absence of interference is confirmed. If it is determined that the information indicated there, the machining program is operated the shaft drive section at a slower velocity than the operating speed of the shaft driving unit specified in, if it is determined that the interference is present, the operation of the shaft driving unit stoppage When it is determined that the command has already been executed, it is determined whether or not the command has no interference based on the determination result of the command stored in the storage unit, and the command has no interference. If it is determined, the operation speed of the shaft drive unit is set to a speed higher than the previous operation speed .

The numerical control method according to an eighth aspect of the present invention is the numerical control method according to the seventh aspect of the present invention, when determining whether or not there is interference during operation for each command, without attaching a tool to the tool provided in the shaft drive unit. It is characterized by operating according to instructions.

A control program according to the ninth invention is a numerical value for controlling the operation of a plurality of axis driving units that relatively drive a tool and a workpiece in three orthogonal directions according to a machining program composed of a plurality of instructions. In the control program that can be executed by the control device, a first determination is made to determine whether the numerical control device has information indicating that the machining program confirms the presence or absence of interference during the operation of the shaft driving unit. If the first determination means determines that there is information indicating that the presence or absence of interference is present, the operation speed of the shaft drive unit is slower than the operation speed of the axis drive unit specified in the machining program A speed setting means for setting the speed, a drive means for operating the shaft driving section at a speed set by the speed setting means, and a second for judging the presence or absence of interference for each command while the shaft driving section is operating. Determining means, determination result storage means for storing a determination result of the determination means of the second to the storage means for each instruction, at the driving means, whether or not a command of a machining program for operating the shaft driving unit is already running third determination means for determining, and when it is determined that the interference is present at the second determining means, to function as a stop means for stopping the operation of the shaft driving unit, said instruction by said third determination means If it is determined that the command has already been executed, it is determined whether the command has no interference based on the determination result of the command stored in the determination result storage unit, and it is determined that the command has no interference. If the speed setting means, characterized in Citea Rukoto to set the operating speed of the shaft driving portion faster than the previous operation speed.

In the first invention, the seventh invention, and the ninth invention, when the machining program is an operation mode for confirming the presence or absence of interference during the operation of the shaft drive unit, the operation speed of the shaft drive unit is designated by the machining program. Set to a speed slower than the operating speed of the shaft drive. Then, the shaft drive unit is operated at the set speed, the presence or absence of interference is determined for each command while the shaft drive unit is operating, and the operation of the shaft drive unit is stopped when there is interference. This makes it possible to slow down the operation speed during the confirmation operation of the shaft drive unit, accurately determine whether or not interference occurs due to the operation of the shaft drive unit, and if the interference occurs, operate the shaft drive unit. Since it can be stopped, damage to tools, jigs, workpieces, etc. due to the operation of the shaft drive unit can be prevented in advance, and it can be confirmed whether the operation of the shaft drive unit by the machining program is normal or not It becomes possible.
In addition, when the determination result of the presence / absence of interference is stored and a machining program command for operating the shaft driving unit has already been executed, whether or not the command has no interference based on the determination result of the stored command. If it is determined that the command has no interference, the operation speed of the shaft drive unit is set to a speed higher than the previous operation speed. As a result, for commands that are determined to have no interference in the previous confirmation operation, the operation speed should be increased because there is no risk of damage to tools, jigs, workpieces, etc. due to interference when performing the confirmation operation. Thus, the time required for the confirmation operation process can be shortened.

  In the second invention, the current value supplied to the shaft drive unit is detected, and it is determined that there is interference when the detected current value exceeds a predetermined value. Accordingly, it is possible to detect a current value that is excessively supplied to the shaft drive unit when interference occurs, and to reliably detect the occurrence of interference.

In the third aspect of the invention, the command determined to have no interference in the previous confirmation operation is faster than the operation speed of the axis drive unit specified by the machining program or the operation speed of the axis drive unit set by the speed setting means. By setting to, damage to tools, jigs, workpieces and the like due to interference can be avoided, and the time required for the confirmation operation process can be shortened.

In the fourth invention, the determination result of the presence or absence of interference for each command is stored in the storage means in association with the coordinate value of the movement end point of the shaft driving unit based on the command, and the movement of the shaft driving unit based on the command to be executed Calculate the coordinate value of the end point, extract the determination result of the presence or absence of interference based on the calculated coordinate value, and if it is determined that there is no interference based on the extracted determination result, the speed of the shaft drive unit is compared to the previous speed Set to a faster speed. As a result, information on the presence or absence of interference in the previous confirmation operation can be extracted using the coordinate value of the movement end point for each command of the axis drive unit as key information. For example, it is stored that there is interference in the previous operation. If it is determined that there is no interference, it is determined that the control program has been corrected and operated at a speed higher than the previous operation speed. If it is determined that there is interference in this determination, the control program It is possible to adjust the operation speed of the shaft drive unit based on the possibility of interference, for example, by determining that the operation speed remains unchanged from the previous operation. Therefore, it is possible to confirm the operation of the shaft driving unit by the control program without damaging tools, jigs, workpieces and the like.

In the fifth invention, the determination result of the presence or absence of interference for each command is stored in the storage means in association with the coordinate values of the movement start point and the movement end point of the axis driving unit based on the command, and the axis based on the command to be executed Calculate the coordinate values of the movement start point and movement end point of the drive unit, extract the determination result of the presence or absence of interference stored in the storage means based on the calculated coordinate value, and if there is no interference based on the extracted determination result If it is determined, the speed of the shaft drive unit is set to a speed higher than the previous speed. As a result, it is possible to extract information on the presence or absence of interference in the previous confirmation operation using the coordinate values of the movement start point and end point for each command of the axis drive unit as key information, and for example, it is stored that there is interference in the previous operation. If it is determined that there is no interference in this determination, it is determined that the control program has been modified and operated at a speed higher than the previous operation speed, and if it is determined that there is interference in this determination It is possible to adjust the operation speed of the shaft drive unit based on the possibility of interference, for example, by determining that the control program remains as it was last time and operating at a speed slower than the previous operation speed. Therefore, it is possible to confirm the operation of the shaft driving unit by the control program without damaging tools, jigs, workpieces and the like.

In the sixth invention, the machining program is stored in one storage means, the machining program is copied and stored in another storage means, information for specifying an instruction to be executed, for example, a line number is extracted and extracted The command corresponding to the information to be extracted is extracted from the stored copied machining program, and when the command to be executed matches the extracted command, the speed of the shaft drive unit is set to a speed higher than the previous speed. As a result, if the previous command matches the current command, it can be determined that the reliability of the information regarding the presence or absence of interference in the previous check operation is high. For example, the previous operation stores interference. If it is determined that there is no interference in this determination, it is determined that the control program has been corrected and moved at high speed, and if it is determined in this determination that there is interference, the control program is It is possible to move the vehicle at a low speed. If the previous command and the current command do not match, it can be determined that the reliability of the information regarding the presence or absence of interference in the previous check operation is low. For example, it is stored as no interference in the previous operation. Even in such a case, it is possible to adjust the operating speed of the shaft driving unit based on the possibility of interference, such as moving at a low speed. Therefore, it is possible to confirm the operation of the shaft driving unit by the control program without damaging tools, jigs, workpieces and the like.

In the eighth invention, when it is determined whether or not there is interference during operation for each command, the tool provided in the shaft drive unit is operated according to the command of the machining program without attaching a tool. As a result, for example, even when there is a drilling process and interference occurs, it is possible to avoid unnecessary damage without drilling a hole in the jig.

  According to the present invention, during the operation of checking for the presence or absence of interference, the operation speed of the shaft drive unit can be slowed down, and it is accurately determined whether or not interference occurs due to the operation of the shaft drive unit, and interference occurs. In this case, since the operation of the shaft drive unit can be stopped, damage to tools, jigs, workpieces, etc. due to the operation of the shaft drive unit can be prevented in advance, and the operation of the shaft drive unit by the machining program is normal. It is possible to confirm whether or not there is.

  In addition, according to the present invention, since the instruction determined to have no interference in the previous confirmation operation is a command that does not cause damage to the tool, jig, workpiece, etc. due to interference when performing the confirmation operation, By increasing the operation speed, the time required for the confirmation operation process can be shortened.

  Furthermore, according to the present invention, for example, even when there is a drilling process and interference occurs, it is possible to avoid unnecessary damage without making a hole in the jig.

  Hereinafter, the present invention will be described with reference to the drawings illustrating embodiments thereof. FIG. 1 is a block diagram showing a configuration of a numerical controller according to an embodiment of the present invention. A numerical control device 1 according to an embodiment of the present invention includes a ROM 11, RAMs 12 and 13, a display device 14, an input device 15, which are connected to the CPU 10 via an internal bus 18 around at least a CPU (central control device) 10. It comprises an external interface 16, an auxiliary storage device 17 and the like that are communicably connected to a shaft drive unit 21 such as a motor (drive device) provided outside.

  The CPU 10 is connected to the above-described hardware units of the numerical controller via the internal bus 18 and controls the above-described hardware units, and also stores a processing program stored in the ROM 11 such as an operation of a machine tool. A numerical control program (hereinafter referred to as a control program) that numerically controls the speed according to conditions is executed.

  The ROM 11 is a nonvolatile storage medium, and stores a control program for controlling the machine tool. The RAM 12 is a non-volatile storage medium such as a flash memory, and numerically controls the operation of a machine tool such as a lathe or a machining center, and executes a machining program for machining a workpiece, a machining program, a control program, and the like. Temporary data generated in the memory is stored. A copy of the machining program can also be stored. The machining program can be acquired from an external computer via communication means (not shown) or from a portable storage medium such as a DVD or CD-ROM via the auxiliary storage device 17.

  The RAM 13 is a non-volatile storage medium such as a flash memory, and stores a program number of a machining program used for operation and identification information for identifying a command being executed at that time, such as a command number.

  The display device 14 is a display device such as a liquid crystal display device (LCD) or a display device (CRT) that displays and outputs an image to the user. The content of the machining program being operated, the content of the command being executed, the operation speed, The presence / absence of interference, whether or not it is a confirmation operation mode for the presence / absence of interference, etc. are displayed.

  The input device 15 includes a panel switch and a button switch for performing on / off control of a confirmation operation mode for performing a confirmation operation of the machining program, in addition to a keyboard and a touch panel for inputting information such as conditions necessary for execution of the machining program and the control program. Also includes a rotation switch and the like. The external interface 16 sends an instruction signal in accordance with a machining program to be executed to a drive source that moves and rotates the device. The shaft drive unit 21 such as a motor (drive device) receives an instruction signal in accordance with the machining program from the CPU 10 via the external interface 16 connected to be communicable. The shaft drive unit 21 is a drive source for movement in the x-axis, y-axis, and z-axis directions orthogonal to each other and for rotation around three axes.

  The auxiliary storage device 17 uses a portable storage medium 4 such as a CD or a DVD, and downloads a processing program, a control program, data, and the like to be processed by the CPU 10 to the RAM 12. It is also possible to write the data processed by the CPU 10 for backup.

  Hereinafter, a method for adjusting the operation speed when checking the presence of interference between the tool and the workpiece or between the tool and the jig according to the machining program used in the numerical controller 1 having the above-described configuration will be described. FIG. 2 is a flowchart showing a processing procedure of the CPU 10 of the numerical controller 1 according to the embodiment of the present invention. In this embodiment, the case of switching to the confirmation operation mode during the operation of the machining program will be described. However, the present invention is not particularly limited to this, and is specified for each machining program using parameters before the operation of the machining program. You can keep it. Further, switching to the confirmation operation mode is performed by the input device 15 of the numerical controller 1. For example, mode switching using a panel switch, a push button, or the like may be used, or mode setting using a rotary switch may be used.

  The CPU 10 of the numerical controller 1 copies the determination result of the presence / absence of interference stored in the RAM 13 for each command included in the machining program as the determination result of the previous presence / absence of interference, and displays the determination result of the current presence / absence of interference. The area to be stored is initialized (step S201).

  The CPU 10 determines whether or not the machining program is finished (step S202), and when the CPU 10 judges that the machining program is finished (step S202: YES), the process is finished. When the CPU 10 determines that the machining program has not ended (step S202: NO), the CPU 10 sequentially reads the commands constituting the machining program into the RAM 13 one block at a time (step S203), and whether or not the confirmation operation mode is set. Is determined (step S204). Step S204 functions as a first determination unit.

  When the CPU 10 determines that it is not in the confirmation operation mode (step S204: NO), the CPU 10 executes the read command in accordance with the instruction of the machining program (step S205), and returns to step S202 to perform the above-described processing. repeat.

  When the CPU 10 determines that the operation mode is the confirmation operation mode (step S204: YES), the CPU 10 executes the read command at an operation speed slower than the speed specified by the machining program (step S206). The presence or absence is detected (step S207). Note that step S206 functions as a speed setting unit and a driving unit.

  The CPU 10 determines whether interference has occurred (step S208). If the CPU 10 determines that interference has not occurred (step S208: NO), the CPU 10 returns to step S202 and repeats the above-described processing. If the CPU 10 determines that interference has occurred (step S208: YES), the CPU 10 stops the command being executed (step S209) and ends the process. Step S208 functions as a second determination unit, and step S209 functions as a stop unit.

  The instruction operation confirmation process by the CPU 10 is not limited to executing the read instruction at an operation speed slower than the speed specified by the machining program, as shown in step S206. FIG. 3 is a flowchart of one operation confirmation process of the CPU 10 of the numerical controller 1 according to the embodiment of the present invention.

  In the operation confirmation process shown in FIG. 3, the space is divided at appropriate intervals in the x-axis, y-axis, and z-axis directions orthogonal to each other, area numbers are assigned to the divided areas, and the areas are associated with the area numbers. Whether the presence / absence has been determined and the determination result are stored in the RAM 13 as a determination result table 131. The area is inquired by the coordinate value of the movement end point of the tool tip for each command.

  FIG. 4 is a diagram illustrating an example of the determination result table 131. The determination result table 131 stores the current determination result and the previous determination result for each area number. The determination result indicates that “1” is interference, “2” is no interference, and “0” is unconfirmed.

The CPU 10 calculates a movement end point position based on the read command (step S301), and specifies an area number including the calculated movement end point position (step S302). The CPU 10 refers to the determination result table 131 of the RAM 13 (step S303), and determines whether or not the previous determination result is “2” (step S304). Note that step S301 functions as a first coordinate value calculation unit, step S303 functions as a determination result extraction unit, and step S304 functions as a third determination unit.

  When the CPU 10 determines that the previous determination result is “2” (step S304: YES), the CPU 10 determines that there is almost no possibility of interference, and sets the moving speed of the tool to “3” ( Step S305). Here, the moving speed of the tool is a speed that is faster than or equal to “3” specified by the machining program, and a speed that is slower than the moving speed specified by “2” and faster than “1”. Indicates a speed slower than the moving speed designated by “1”.

  When the CPU 10 determines that the previous determination result is not “2” (step S304: NO), the CPU 10 determines whether or not the current determination result is “2”. When the CPU 10 determines that the current determination result is “2” (step S306: YES), the CPU 10 determines that there is little possibility of interference, and sets the moving speed of the tool to “2” (step S306). S307).

  When the CPU 10 determines that the current determination result is not “2” (step S306: NO), the CPU 10 determines that there is a high possibility of interference, and sets the moving speed of the tool to “1” ( Step S308). The CPU 10 executes the command at the set moving speed (step S309), and determines whether there is interference (step S310).

  When the CPU 10 determines that there is no interference (step S310: NO), the CPU 10 updates the current determination result in the determination result table 131 to “2” (step S311), and returns to step S202. If the CPU 10 determines that there is interference (step S310: YES), the CPU 10 updates the current determination result in the determination result table 131 to “1” (step S312), returns to step S209, and executes the command being executed. Is stopped (step S209).

  Note that the determination result table 131 is not limited to the method of inquiring, as key information, the area number determined by the coordinate value of the movement end point of the tool tip for each command. A method of inquiring based on the coordinate value of the movement end point may be used. FIG. 5 is a diagram illustrating an example of the determination result table 131 when inquiring based on the coordinate values of the movement start point and the movement end point of the tool tip. As described above, in the method of obtaining the previous determination result based on the movement start point and the movement end point, it is possible to omit the specifying process of specifying the area based on the movement end point position, and to reduce the calculation processing load of the CPU 10. It becomes possible.

  Further, the instruction operation confirmation process may be executed based on whether or not the instruction has been updated. FIG. 6 is a flowchart of another operation confirmation process of the CPU 10 of the numerical controller 1 according to the embodiment of the present invention.

  In the operation confirmation process shown in FIG. 6, the machining program itself used in the previous operation confirmation process is copied to the RAM 12, and each time a command is read block by block, the machining program copied with the read machining program Is compared, it is determined whether or not the read instruction has been updated. If the command has not been updated, the previous determination result can be trusted, so it can be determined that the operation speed does not need to be slowed, whereas if it has been updated, the previous determination result is trusted. It is determined that it cannot be performed, and the operation speed is adjusted according to the conditions.

  FIG. 7 is a diagram illustrating another example of the determination result table 131. The determination result table 131 stores the current determination result and the previous determination result for each instruction of the copied machining program. The determination result indicates that “1” is interference, “2” is no interference, and “0” is unconfirmed.

  The CPU 10 of the numerical controller 1 extracts information for specifying the read instruction, for example, a line number (step S601), and a machining program copied and stored in the RAM 12 based on the information for specifying the extracted instruction. Is specified (step S602). The CPU 10 determines whether or not the read instruction matches the instruction specified in the machining program copied and stored (step S603). Step S601 functions as an instruction specifying information extraction unit, step S602 functions as an instruction extraction unit, and step S603 functions as a fifth determination unit.

  When the CPU 10 determines that the two instructions do not match (step S603: NO), the CPU 10 inquires the determination result table 131 of the RAM 13 (step S604) and determines whether or not the previous determination result is “1”. Is determined (step S605).

  When the CPU 10 determines that the previous determination result is not “1” (step S605: NO), the CPU 10 determines that the instruction is updated and is the same as the first operation check process, and the tool The moving speed is set to “1” (step S606). Here, the moving speed of the tool is faster than the moving speed designated by “3” in the machining program, the speed equivalent to the moving speed designated by “2”, and slower than the moving speed designated by “1”. Each speed is shown.

  When the CPU 10 determines that the previous determination result is “1” (step S605: YES), the CPU 10 determines that some correction has been made because the command has been updated, and the tool is moved. The speed is set to “2”, which is the same as the machining program setting (step S607).

  When the CPU 10 determines that both instructions match (step S603: YES), the CPU 10 inquires the determination result table 131 of the RAM 13 (step S608) and determines whether or not the previous determination result is “2”. Judgment is made (step S609). When the CPU 10 determines that the previous determination result is not “2” (step S609: NO), the CPU 10 determines that the possibility of interference is high, and sets the moving speed of the tool to “1” ( Step S610). When the CPU 10 determines that the previous determination result is “2” (step S609: YES), the CPU 10 determines that there is almost no possibility of interference, and sets the moving speed of the tool to “3”. (Step S611).

  The CPU 10 executes the command at the set moving speed (step S612), and determines whether there is interference (step S613). When the CPU 10 determines that there is no interference (step S613: NO), the CPU 10 updates the current determination result in the determination result table 131 to “2” (step S614), and returns to step S202. When the CPU 10 determines that there is interference (step S613: YES), the CPU 10 updates the current determination result in the determination result table 131 to “1” (step S615), returns to step S209, and executes the command being executed. Is stopped (step S209).

  When the command being executed is stopped, the CPU 10 of the numerical controller 1 may send a signal that supports the output of a warning sound to a sound output device (not shown) such as a speaker, or display A warning may be displayed via the device 14.

  Moreover, the detection method of the presence or absence of interference during confirmation operation | movement is not specifically limited. For example, the occurrence of interference is detected by detecting fluctuations in the current value supplied to the shaft drive unit 21 that occurs when there is interference. FIG. 8 is a flowchart of the process for determining the presence or absence of interference based on the current value supplied to the shaft drive unit 21 of the CPU 10 of the numerical controller 1 according to the embodiment of the present invention.

  The CPU 10 of the numerical controller 1 detects the current value supplied to the shaft drive unit at regular time intervals (step S801). The CPU 10 determines whether or not the confirmation operation mode is set (step S802). Step S801 functions as current value detection means.

  When the CPU 10 determines that it is not in the confirmation operation mode (step S802: NO), the CPU 10 initializes a current detection timer that measures the time during which an abnormal current value is detected to 0 (zero) (step S803). Then, a signal indicating that there is no interference is transmitted (step S804).

When the CPU 10 determines that the confirmation operation mode is set (step S802: YES), the CPU 10 determines whether or not the detected current value exceeds a predetermined upper limit value (step S805). When the CPU 10 determines that the detected current value does not exceed the predetermined upper limit value (step S805: NO), the CPU 10 shifts the process to step S803. Note that step S805 functions as a fourth determination unit.

  When the CPU 10 determines that the detected current value exceeds the predetermined upper limit value (step S805: YES), the CPU 10 determines that an abnormal current value has been detected and starts measuring time by the current detection timer. (Step S806). The CPU 10 determines whether or not the time measured by the current detection timer is greater than a predetermined time (step S807).

  When the CPU 10 determines that the time measured by the current detection timer is equal to or shorter than the predetermined time (step S807: NO), the CPU 10 shifts the process to step S804. If the CPU 10 determines that the time measured by the current detection timer is greater than the predetermined time (step S807: YES), the CPU 10 sends a signal indicating that there is interference (step S808).

  As described above, according to the present embodiment, it is possible to slow down the operation speed of the shaft drive unit 21 during the confirmation operation for the presence or absence of interference, and to determine whether or not interference occurs due to the operation of the shaft drive unit 21. Since the operation of the shaft drive unit 21 can be stopped when an accurate determination is made and interference occurs, damage to tools, jigs, workpieces, etc. due to the operation of the shaft drive unit 21 can be prevented in advance. It is possible to confirm whether or not the operation of the shaft drive unit 21 by the program is normal.

  In addition, for commands that were determined to have no interference in the previous confirmation operation, the command, which does not cause damage to tools, jigs, workpieces, etc. due to interference when performing the confirmation operation, can be increased by increasing the operation speed. Thus, the time required for the confirmation operation process can be shortened.

  When determining whether or not there is interference during operation for each command, it is preferable to operate the tool provided in the shaft drive unit 21 according to the command of the machining program without mounting the tool. As a result, for example, even when there is a drilling process and interference occurs, it is possible to avoid unnecessary damage without drilling a hole in the jig.

  The present invention is not limited to the above-described embodiments, and can be implemented in various forms without departing from the gist of the present invention.

It is a block diagram which shows the structure of the numerical control apparatus which concerns on embodiment of this invention. It is a flowchart which shows the process sequence of CPU of the numerical control apparatus which concerns on embodiment of this invention. It is a flowchart of one operation | movement confirmation process of CPU of the numerical control apparatus which concerns on embodiment of this invention. It is a figure which shows an example of the determination result table. It is a figure which shows an example of the determination result table in the case of inquiring based on the coordinate value of the movement start point of a tool front-end | tip part, and a movement end point. It is a flowchart of other operation | movement confirmation processing of CPU of the numerical control apparatus which concerns on embodiment of this invention. It is a figure which shows the other example of a determination result table. It is a flowchart of the judgment process of the presence or absence of interference based on the electric current value supplied to the axial drive part of CPU of the numerical controller which concerns on embodiment of this invention.

Explanation of symbols

4 Portable storage medium 10 CPU
11 ROM
12, 13 RAM
14 Display Device 15 Input Device 16 External Interface 17 Auxiliary Storage Device 21 Axis Drive Unit

Claims (9)

In a numerical control device that controls the operation of a plurality of axis driving units that relatively drive a tool and a workpiece in three axial directions orthogonal to each other in accordance with a machining program configured by a plurality of instructions,
First determination means for determining presence / absence of information indicating confirmation of presence / absence of interference during operation of the shaft driving unit by the machining program;
When it is determined by the first determination means that there is information indicating that the presence or absence of interference is confirmed, the operation speed of the shaft drive unit is set to be slower than the operation speed of the shaft drive unit specified by the machining program. Speed setting means to set;
Driving means for operating the shaft driving section at a speed set by the speed setting means;
A second determining means for determining presence or absence of interference for each of the commands while the shaft driving unit is operating;
A determination result storing means for storing in the memory means for each instruction determination result of said second determination means,
A third judging means for judging whether or not an instruction of a machining program for operating the shaft driving unit has already been executed by the driving means;
If it is determined that the interference is present in the second determination means, and a stop means for stopping the operation of the shaft driving unit,
The speed setting means includes
When the third determination means determines that the command has already been executed, it is determined whether or not the instruction has no interference based on the determination result of the command stored in the determination result storage means. If it is determined that the interference is not instruction, a numerical control device according to claim Citea Rukoto to set the operating speed of the shaft driving portion faster than the operating speed of the previous. The shaft driving unit is electric,
The second determination means includes
Current value detecting means for detecting a current value supplied by the shaft driving unit;
And fourth determination means for determining whether or not the current value detected by the current value detection means exceeds a predetermined value,
2. The numerical control apparatus according to claim 1, wherein when it is determined that the current value detected by the fourth determination means exceeds a predetermined value, it is determined that there is interference. Operating speed of the last time, according to claim 1 or claim 2, wherein the operating speed of the shaft driving unit specified by the machining program, or an operation speed of the shaft driving portion set by the speed setting means numerical controller according to. A determination result storage unit that stores a determination result of the presence or absence of interference for each command in a storage unit in association with a coordinate value in a coordinate system specified by three axes of the movement end point of the axis driving unit based on the command;
First coordinate value calculating means for calculating a coordinate value of a movement end point of the axis driving unit based on an instruction to be executed;
A determination result extraction means for extracting a determination result of the presence or absence of interference stored in the storage means based on the calculated coordinate value;
The speed setting means includes
4. The method according to claim 1, wherein when it is determined that there is no interference based on the extracted determination result, the speed of the shaft driving unit is set to a speed higher than the previous speed . numerical controller according to. A determination result storage that stores in the storage means the determination result of the presence or absence of interference for each command in association with coordinate values in the coordinate system specified by the three axes of the movement start point and the movement end point of the axis driving unit based on the command Means,
Second coordinate value calculation means for calculating the coordinate values of the movement start point and the movement end point of the axis drive unit based on the command to be executed;
A determination result extraction means for extracting a determination result of the presence or absence of interference stored in the storage means based on the calculated coordinate value;
The speed setting means includes
4. The method according to claim 1, wherein when it is determined that there is no interference based on the extracted determination result, the speed of the shaft driving unit is set to a speed higher than the previous speed . numerical controller according to. The machining program is stored in one storage means,
Copy means for copying the machining program and storing it in another storage means;
Command specifying information extracting means for extracting information for specifying a command to be executed;
An instruction extracting means for extracting an instruction corresponding to the extracted specified information from a stored machining program;
And a fifth determination means for determining whether or not the instruction to be executed and the extracted instruction match,
4. The method according to claim 1, wherein when the fifth determining means determines that the instructions coincide with each other, the speed of the shaft driving unit is set to be higher than the previous speed . numerical controller according to. In a numerical control method using a numerical control device that controls operations of a plurality of axis driving units that relatively drive a tool and a workpiece in three mutually orthogonal directions according to a machining program configured by a plurality of instructions,
Determining the presence or absence of information indicating the presence or absence of interference during operation of the shaft drive unit by the machining program;
During operation, determine the presence or absence of interference for each of the instructions,
Store the result of determination of the presence or absence of interference in the storage means for each command,
Determining whether or not a machining program command for operating the shaft drive unit has already been executed,
If the information indicating that to check for interference is determined that there, before Symbol machining program is operated the shaft drive section at a slower velocity than the operating speed of the shaft driving unit specified in,
If it is determined that the interference is present, it stops the operation of the shaft driving unit,
If it is determined that the command has already been executed, it is determined whether or not the command has no interference based on the determination result of the command stored in the storage unit, and it is determined that the command has no interference. In this case, the numerical control method is characterized in that the operation speed of the shaft drive unit is set to a speed higher than the previous operation speed . 8. The numerical control method according to claim 7 , wherein when determining whether or not there is interference during operation for each command, the operation is performed according to the command of the machining program without attaching a tool to the tool provided in the shaft driving unit. . A control program that can be executed by a numerical control device that controls the operation of a plurality of axis drive units that relatively drive a tool and a workpiece in three mutually orthogonal directions according to a machining program configured by a plurality of instructions In
The numerical control device,
First determination means for determining presence / absence of information indicating confirmation of presence / absence of interference during operation of the shaft driving unit by the machining program;
If the first determination means determines that there is information indicating that the presence or absence of interference is confirmed, the operation speed of the shaft drive unit is set to a speed slower than the operation speed of the shaft drive unit specified by the machining program. Speed setting means to set,
Drive means for operating the shaft drive section at a speed set by the speed setting means;
A second determining means for determining presence or absence of interference for each of the commands while the shaft driving unit is operating;
A determination result storage means for storing the determination result of the second determination means in the storage means for each instruction;
A third judging means for judging whether or not an instruction of a machining program for operating the shaft driving section has already been executed by the driving means; and
If the second determination means determines that there is interference, the second determination means functions as a stop means for stopping the operation of the shaft drive unit ,
When the third determination means determines that the instruction has already been executed, it is determined whether or not the instruction has no interference based on the determination result of the instruction stored in the determination result storage means. If it is determined that the interference is not instruction, a control program wherein the speed setting means, characterized in Citea Rukoto to set the operating speed of the shaft driving portion faster than the previous operation speed.

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