WO2022239155A1 - 数値制御装置、およびコンピュータ読み取り可能な記憶媒体 - Google Patents
数値制御装置、およびコンピュータ読み取り可能な記憶媒体 Download PDFInfo
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- WO2022239155A1 WO2022239155A1 PCT/JP2021/018083 JP2021018083W WO2022239155A1 WO 2022239155 A1 WO2022239155 A1 WO 2022239155A1 JP 2021018083 W JP2021018083 W JP 2021018083W WO 2022239155 A1 WO2022239155 A1 WO 2022239155A1
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- 230000006870 function Effects 0.000 description 24
- 238000010586 diagram Methods 0.000 description 11
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- 230000008859 change Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/19—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/416—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by control of velocity, acceleration or deceleration
- G05B19/4166—Controlling feed or in-feed
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/402—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by control arrangements for positioning, e.g. centring a tool relative to a hole in the workpiece, additional detection means to correct position
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/49—Nc machine tool, till multiple
- G05B2219/49077—Control of feed and spindle, cutting speed
Definitions
- the present disclosure relates to numerical controllers and computer-readable storage media.
- the numerical controller controls each part of the machine tool based on the machining program.
- control information for controlling the control axis is set based on a code called G code.
- G code a code that specifies a position gain, feedforward coefficient, and acceleration/deceleration time constant corresponding to the positioning command.
- a position gain, a feedforward coefficient, and an acceleration/deceleration time constant corresponding to the cutting feed command are set as control information.
- An object of the present disclosure is to provide a numerical controller capable of executing control of a control axis with appropriate control information set.
- a numerical control device has a control information storage unit that stores a plurality of pieces of control information for controlling a control axis of a machine tool, a speed command that specifies the feed speed of the control axis, or a movement command derived from the speed command.
- a control information determination unit that determines one of the plurality of control information stored in the control information storage unit based on the control information; and controls the control axis based on the one control information determined by the control information determination unit. and a control unit.
- a computer-readable storage medium stores a plurality of pieces of control information for controlling a control axis of a machine tool based on a speed command specifying a feed rate of a control axis of the machine tool or a movement command derived from the speed command. It stores an instruction for causing a computer to determine one of the control information and to control the control axis based on the determined one of the control information.
- control the control axis with appropriate control information set.
- FIG. 3 is a block diagram showing an example of functions of a numerical control device;
- FIG. It is a figure explaining an example of the control information memorize
- 4 is a flow chart showing an example of the flow of processing executed by a numerical control device; It is a figure which shows a part of machining program. It is a figure explaining an example of the control information memorize
- FIG. 5 is a diagram illustrating an example of acceleration time of a control axis;
- FIG. 1 is a diagram showing an example of the hardware configuration of a machine tool.
- Machine tool 1 is, for example, a lathe, a machining center, or a multitasking machine.
- the machine tool 1 includes, for example, a numerical control device 2, an input/output device 3, a servo amplifier 4 and a servo motor 5, a spindle amplifier 6 and a spindle motor 7, and an auxiliary device 8.
- the numerical controller 2 is a device that controls the machine tool 1 as a whole.
- the numerical controller 2 includes a CPU (Central Processing Unit) 201 , a bus 202 , a ROM (Read Only Memory) 203 , a RAM (Random Access Memory) 204 and a nonvolatile memory 205 .
- a CPU Central Processing Unit
- ROM Read Only Memory
- RAM Random Access Memory
- the CPU 201 is a processor that controls the entire numerical controller 2 according to the system program.
- the CPU 201 reads a system program or the like stored in the ROM 203 via the bus 202 and performs various processes based on the system program. Also, the CPU 201 controls the servo motor 5 and the spindle motor 7 based on the machining program.
- the CPU 201 analyzes the machining program and outputs control commands to the servo motor 5 and the spindle motor 7 for each control cycle.
- a bus 202 is a communication path that connects each piece of hardware in the numerical controller 2 to each other. Each piece of hardware within the numerical controller 2 exchanges data via the bus 202 .
- the ROM 203 is a storage device that stores system programs and the like for controlling the numerical controller 2 as a whole.
- a ROM 203 is a computer-readable storage medium.
- the RAM 204 is a storage device that temporarily stores various data.
- a RAM 204 functions as a work area for the CPU 201 to process various data.
- the nonvolatile memory 205 is a storage device that retains data even when the machine tool 1 is powered off and power is not supplied to the numerical controller 2 .
- the nonvolatile memory 205 stores, for example, machining programs and various parameters input from the input/output device 3 .
- Non-volatile memory 205 is a computer-readable storage medium.
- the nonvolatile memory 205 is composed of, for example, an SSD (Solid State Drive).
- the numerical controller 2 further comprises an interface 206 , an axis control circuit 207 , a spindle control circuit 208 , a PLC (Programmable Logic Controller) 209 and an I/O unit 210 .
- an interface 206 an interface 206 , an axis control circuit 207 , a spindle control circuit 208 , a PLC (Programmable Logic Controller) 209 and an I/O unit 210 .
- the interface 206 connects the bus 202 and the input/output device 3 .
- the interface 206 sends various data processed by the CPU 201 to the input/output device 3, for example.
- the input/output device 3 is a device that receives various data via the interface 206 and displays various data.
- the input/output device 3 also accepts input of various data and sends the various data to the CPU 201 via the interface 206 .
- the input/output device 3 includes a display such as an LCD (Liquid Crystal Display), a keyboard, a mouse, and the like.
- the input/output device 3 may be a touch panel.
- the axis control circuit 207 is a circuit that controls the servo motor 5 .
- the axis control circuit 207 receives a control command from the CPU 201 and outputs a command for driving the servo motor 5 to the servo amplifier 4 .
- the axis control circuit 207 sends a torque command for controlling the torque of the servo motor 5 to the servo amplifier 4, for example.
- the servo amplifier 4 receives a command from the axis control circuit 207 and supplies current to the servo motor 5 .
- the servo motor 5 is driven by being supplied with current from the servo amplifier 4 .
- the servomotor 5 is connected to, for example, a ball screw that drives the tool post.
- a structure of the machine tool 1 such as the tool post moves in, for example, the X-axis direction, the Y-axis direction, or the Z-axis direction.
- the servomotor 5 may incorporate a speed detector (not shown) for detecting the feed speed of each control axis.
- a spindle control circuit 208 is a circuit for controlling the spindle motor 7 .
- a spindle control circuit 208 receives a control command from the CPU 201 and outputs a command for driving the spindle motor 7 to the spindle amplifier 6 .
- the spindle control circuit 208 for example, sends a torque command for controlling the torque of the spindle motor 7 to the spindle amplifier 6 .
- the spindle amplifier 6 receives a command from the spindle control circuit 208 and supplies current to the spindle motor 7 .
- the spindle amplifier 6 incorporates an ammeter 61 for measuring the current value of the current supplied to the spindle motor 7 .
- the ammeter 61 detects the current value of the current supplied to the spindle motor 7 .
- the ammeter 61 sends data indicating the detected current value to the CPU 201 .
- the spindle motor 7 is driven by being supplied with current from the spindle amplifier 6 .
- a spindle motor 7 is connected to the main shaft and rotates the main shaft.
- the PLC 209 is a device that executes the ladder program and controls the auxiliary equipment 8. PLC 209 sends commands to auxiliary equipment 8 via I/O unit 210 .
- the I/O unit 210 is an interface that connects the PLC 209 and the auxiliary device 8.
- the I/O unit 210 sends commands received from the PLC 209 to the auxiliary equipment 8 .
- the auxiliary device 8 is a device that is installed in the machine tool 1 and performs an auxiliary operation in the machine tool 1.
- the auxiliary equipment 8 may be equipment installed around the machine tool 1 .
- the auxiliary equipment 8 operates based on commands received from the I/O unit 210 .
- the auxiliary device 8 is, for example, a tool changer, a cutting fluid injection device, or an opening/closing door drive.
- the numerical control device 2 is a device that controls each part of the machine tool 1 based on a machining program.
- FIG. 2 is a block diagram showing an example of functions of the numerical controller 2.
- the numerical controller 2 includes a program storage unit 211, a program analysis unit 212, a threshold value storage unit 213, a control information storage unit 214, a control information determination unit 215, a control information setting unit 216, and a control unit 217. and
- the program storage unit 211 is implemented by storing a machining program input from the input/output device 3 or the like in the RAM 204 or the nonvolatile memory 205 .
- Threshold storage unit 213 and control information storage unit 214 are realized by storing parameters, control information, etc. input from input/output device 3 or the like in RAM 204 or nonvolatile memory 205 .
- the program analysis unit 212, the control information determination unit 215, the control information setting unit 216, and the control unit 217 are operated by the CPU 201 using the system program stored in the ROM 203 and various data stored in the nonvolatile memory 205. It is realized by
- the program storage unit 211 stores machining programs.
- the machining program is a program for operating each part of the machine tool 1 to machine a workpiece.
- the movement path of the tool, the rotational speed of the spindle, the depth of cut, and the like are specified using G codes, S codes, and the like.
- the feed rate is specified using an F code. That is, the F code that specifies the feed rate in the machining program is the speed command.
- the program analysis unit 212 reads the machining program stored in the program storage unit 211 and analyzes the machining program.
- the program analysis unit 212 analyzes the machining program so that the numerical controller 2 recognizes each command written in the machining program.
- the threshold storage unit 213 stores one or more thresholds.
- the threshold stored in threshold storage section 213 is used by control information determination section 215 to determine one piece of control information.
- the functions of the control information determination unit 215 will be described in detail below.
- the control information storage unit 214 stores a plurality of pieces of control information for controlling the control axes of the machine tool 1.
- Control information is information set to move the control axis of the machine tool 1 .
- a control axis of the machine tool 1 is an axis for moving or rotating a tool or a spindle.
- Control axes include, for example, three orthogonal axes consisting of an X-axis, a Y-axis, and a Z-axis.
- control axes may include, for example, an A axis, a B axis, and a C axis having rotation axes parallel to the X axis direction, an axis parallel to the Y axis direction, and an axis parallel to the Z axis direction, respectively.
- the threshold storage unit 213 and the control information storage unit 214 may be provided in an external medium (eg, USB (Universal Serial Bus) memory).
- the control information determination unit 215 determines control information, which will be described later, based on information stored in the external medium.
- the plurality of control information includes, for example, first control information and second control information.
- the multiple pieces of control information may include three or more pieces of control information.
- the first control information and the second control information each include, for example, at least one of position gain, feedforward coefficient, acceleration/deceleration time constant, and information indicating ON/OFF of the function.
- the function is a function related to movement of the control axis.
- a function related to movement of the control axis is executed, for example, during machining of a workpiece.
- an oscillation cutting function is presented as an example of the function.
- the first control information and the second control information include the upper limit speed of the control axis, acceleration, on/off of the high-precision cutting function, on/off of the output of the rapid feed signal and the cutting feed signal, respectively. , in-position width, and/or information indicative of the inner radius tolerance of the tool.
- the position gain is a numerical value that is multiplied by the position deviation, which is the difference between the position command that specifies the position of the control axis and the position feedback value that indicates the position of the control axis controlled based on the position command.
- a command value for commanding the speed of the control axis is calculated by multiplying the position deviation by the position gain.
- Position gain is also called position loop gain.
- the feedforward coefficient is a numerical value that is multiplied by the differential value of the position command that specifies the position of the control axis.
- the acceleration/deceleration time constant is a numerical value that indicates the time required for the control axis to transition from the speed specified by the speed command to the stopped state, or from the stopped state to reach the speed specified by the speed command.
- Oscillation cutting is to make the tool oscillate or vibrate when cutting the workpiece.
- chips can be finely divided.
- the swing cutting function is generally turned off during non-cutting times such as when a positioning command is executed.
- the swing cutting function is often operated with a swing amplitude proportional to the feed speed of the control shaft in order to shred chips.
- the feed speed is particularly high, if it is operated with a swing amplitude proportional to the feed speed, the swing amplitude becomes large, and as a result, the vibration becomes excessively large. Therefore, when the feed rate is particularly high, it may be desirable to turn off the swing cutting function.
- FIG. 3 is a diagram illustrating an example of control information stored in the control information storage unit 214. As shown in FIG.
- the control information storage unit 214 stores, for example, first control information and second control information.
- the position gain of the first control information is smaller than the position gain of the second control information.
- the feedforward coefficient of the first control information is smaller than the feedforward coefficient of the second control information.
- the acceleration/deceleration time constant of the first control information is smaller than the acceleration/deceleration time constant of the second control information.
- Information indicating ON/OFF of the swing cutting in the first control information is set to OFF.
- Information indicating ON/OFF of the swing cutting in the second control information is set to ON.
- the first control information corresponds to, for example, control information that is set when a positioning command is specified in the conventional numerical controller 2 .
- the second control information corresponds to, for example, control information set when a cutting feed command is specified in the conventional numerical controller 2 .
- the control information determination unit 215 determines one piece of control information among the plurality of pieces of control information stored in the control information storage unit 214 based on a speed command specifying the feed speed of the control axis.
- a speed command specifying the feed speed of the control axis is specified by, for example, an F code in the machining program.
- control information determination unit 215 determines a plurality of pieces of control information stored in the control information storage unit 214. determines which control information to set.
- the control information determination unit 215 first compares the threshold stored in the threshold storage unit 213 with the feed speed of the control axis specified by the speed command. The control information determination unit 215 determines the control information to be the first control information when the feed speed is greater than the threshold value. On the other hand, the control information determination unit 215 determines the control information to be the second control information when the feed speed is equal to or less than the threshold value.
- the control information determination unit 215 determines one piece of control information to be used for controlling the control axis will be described with reference to FIG. 4 .
- FIG. 4 is a diagram showing part of the machining program.
- X100F5800 is specified in the line of sequence number N100 in the machining program.
- X80F4800 is specified in the row of sequence number N200. It is also assumed that the threshold value storage unit 213 stores a threshold value of 5000.
- the control information determination unit 215 compares the value 5800 indicated by the speed command specified in the row of the sequence number N100 with the threshold value 5000. In this case, the feed speed indicated by the speed command specified in the row of sequence number N100 is greater than the threshold value. Therefore, the control information determination unit 215 determines the control information to be the first control information when the line with the sequence number N100 is executed.
- the control information determination unit 215 compares the value 4800 indicated by the speed command specified in the row of sequence number N200 with the threshold value 5000. In this case, the feed speed indicated by the speed command specified in the row of sequence number N200 is below the threshold value. Therefore, the control information determination unit 215 determines the control information to be the second control information when the line with the sequence number N200 is executed.
- the control information determination unit 215 determines one of the plurality of control information stored in the control information storage unit 214 based on the movement command derived from the speed command specifying the feed speed of the control axis. good too. That is, when deriving the movement command from the speed command, the control information determination unit 215 compares the threshold value stored in the threshold storage unit 213 with the feed speed specified by the speed command, and the comparison result is Based on this, the movement command is derived.
- the derived movement commands include, for example, positioning commands and cutting feed commands.
- the control information determination unit 215 determines that the movement command is the positioning command. That is, the control information determination unit 215 derives the positioning command as the movement command from the speed command designated by the machining program. When the derived movement command is a positioning command, the control information determination unit 215 determines the control information to be the first control information corresponding to the positioning command.
- the control information determination unit 215 determines that the movement command is the cutting feed command. In other words, the control information determination unit 215 derives the cutting feed command as the movement command from the speed command specified by the machining program. When the derived movement command is a cutting feed command, the control information determination unit 215 determines the control information to be the second control information corresponding to the cutting feed command.
- the movement command derived from the speed command may include a first cutting feed command and a second cutting feed command different from the first cutting feed command.
- the control information determination unit 215 determines one piece of control information corresponding to the first cutting feed command, and the derived movement command becomes the second cutting feed command. If it is a command, the control information determination unit 215 may determine other control information corresponding to the second cutting feed command.
- the movement command derived from the speed command may include a first positioning command and a second positioning command different from the first positioning command. If the derived movement command is the first positioning command, the control information determination unit 215 determines one piece of control information corresponding to the first positioning command, and the derived movement command is the second positioning command. In this case, the control information determination unit 215 may determine other control information corresponding to the second positioning command.
- the control information setting unit 216 sets one piece of control information determined by the control information determining unit 215 as control information used for controlling the control axis.
- the control information setting unit 216 sets the position gain, the feedforward coefficient, the acceleration/deceleration time constant, and the information indicating ON/OFF of the oscillating cutting to, for example, " Set to small value, small value, small value, and off.
- the control information setting unit 216 sets the position gain, the feedforward coefficient, the acceleration/deceleration time constant, and the information indicating ON/OFF of the oscillating cutting to, for example, " Set to a value greater than, a value greater than a value greater than a value greater than, and on.
- the “small” value and the “large” value refer to a relatively “small” value and a relatively “large” value when comparing the first control information and the second control information, respectively. ' means the value.
- the control unit 217 controls the control axis based on one piece of control information determined by the control information determination unit 215 .
- the control unit 217 controls the control axis based on the first control information.
- the control unit 217 controls the control axis based on the second control information.
- FIG. 5 is a flowchart showing an example of the flow of processing executed by the numerical controller 2.
- the program analysis unit 212 reads the machining program from the program storage unit 211 and analyzes the read machining program (step S1).
- control information determination unit 215 selects one of the plurality of pieces of control information stored in the control information storage unit 214 based on a speed command specifying the feed speed of the control axis or a movement command derived from the speed command.
- One piece of control information is determined (step S2).
- control information setting unit 216 sets one piece of control information determined by the control information determining unit 215 as control information for controlling the control axis (step S3).
- control unit 217 controls the control axis based on one piece of control information set by the control information determination unit 215 (step S4), and ends the process.
- the numerical control device 2 may repeat the processing of steps S1 to S4 each time each line of the machining program is executed, or at a predetermined cycle.
- the numerical controller 2 includes the control information storage unit 214 that stores a plurality of pieces of control information for controlling the control axes of the machine tool 1, the speed command that specifies the feed speed of the control axes, or Based on the movement command derived from the speed command, a control information determination unit 215 that determines one piece of control information among a plurality of pieces of control information stored in the control information storage unit 214; and a control unit 217 that controls the control axis based on one piece of control information.
- the numerical controller can control the control axis based on the appropriate control information.
- machining is performed in a state in which control information different from the control information intended by the creator of the machining program is set. can be prevented. Also, the amount of code specified by the machining program can be reduced.
- the movement command includes a positioning command and a cutting feed command
- the control information determination unit 215 determines one piece of control information corresponding to the positioning command. If the derived movement command is a cutting feed command, the control information determination unit 215 determines one piece of control information corresponding to the cutting feed command. Therefore, appropriate control information is set when the positioning command is derived and when the cutting feed command is derived.
- each of the plurality of pieces of control information includes at least one of position gain, feedforward coefficient, acceleration/deceleration time constant, and information indicating ON/OFF of oscillating cutting. Therefore, each piece of information included in the control information can be set in consideration of machining accuracy, cycle time, and the like.
- the speed command is specified in the machining program.
- the speed command is not limited to being specified by the machining program, and may be specified by any one of parameters, external signals, and external media, for example.
- a parameter is a parameter set in the numerical control device 2 .
- An external signal is, for example, a signal input from a PLC 209 or PC (Personal Computer) connected to the numerical controller 2 .
- An external medium is, for example, a USB (Universal Serial Bus) memory.
- control information determination section 215 determines control information based on one of a parameter, an external signal, and a value stored in an external medium instead of the threshold stored in threshold storage section 213. may
- control information determination unit 215 compares the speed command specified by the machining program with the threshold value and determines one piece of control information based on the comparison result.
- control information determination unit 215 determines the control information by comparing the ratio between the speed command before switching and the speed command after switching when the speed command is switched, that is, the speed ratio and the threshold value.
- control information determination unit 215 compares the speed ratio with a threshold value. If the speed ratio is greater than the threshold, control information determining section 215 determines, for example, the first control information shown in FIG. 3 as the control information to be set. If the speed ratio is equal to or less than the threshold, control information determining section 215 determines the second control information shown in FIG. 3 as the control information to be set.
- control information determination unit 215 determines one piece of control information to be used for controlling the control axis by comparing the speed ratio and the threshold.
- FIG. 6 is a diagram showing part of the machining program.
- X100F100 is specified in the line of sequence number N100 in the machining program.
- X80F1500 is specified in the row of sequence number N200. It is also assumed that the threshold value storage unit 213 stores a threshold value of 1000.
- the first control information and the second control information contain information indicating ON/OFF of the swing cutting function.
- this is not limited to the oscillating cutting function, and may be any function that should be switched on/off by a speed command or a movement command derived from the speed command.
- it may be an interpolation function for high-quality processing.
- the interpolation function is a function of interpolating a movement path so as to smoothly connect movement command points with respect to a cutting movement command. Enabling the interpolation function requires a lot of control cost. Therefore, when the feed speed is high, a large load is applied to the CPU. In this case, the interpolation function may not work properly. In such cases, it is better to turn off this feature. In this way, any function may be used as long as it should be switched on/off based on the feed speed.
- the control information determination unit 215 selects a plurality of control signals stored in the control information storage unit 214 based on a speed command specifying the feed speed of the control axis or a movement command derived from the speed command. One piece of control information is determined from the information. However, the control information determination unit 215 may further change the determined control information based on the acceleration time of the control axis when the speed command is switched. An example in which the control information determining unit 215 changes the determined control information based on the acceleration time of the control axis when the speed command is switched will be described with reference to FIGS. 7 to 9. FIG.
- FIG. 7 is a diagram illustrating an example of control information stored in the control information storage unit 214. As shown in FIG. FIG. 8 is a diagram showing part of the machining program. FIG. 9 is a diagram for explaining the acceleration time of the control axis.
- the control information storage unit 214 stores first control information and second control information.
- the first control information includes position gain, feedforward coefficient, and acceleration/deceleration time constant.
- the position gain of the first control information is set to a smaller value than the position gain of the second control information.
- the feedforward coefficient of the first control information is set to a smaller value than the feedforward coefficient of the second control information.
- the second control information includes position gain, feedforward coefficient, and acceleration/deceleration time constant.
- the position gain of the second control information is set to a value larger than the position gain of the first control information.
- the feedforward coefficient of the second control information is set to a larger value than the feedforward coefficient of the first control information.
- the upper limit speed of the control axis is set in parameters in advance, taking into consideration the mechanical configuration of the machine tool and the safety of the operation of the control axis.
- the positioning command G00 can specify a speed up to the maximum positioning speed.
- the cutting feed command G01 can specify a speed up to the maximum cutting feed speed.
- the acceleration/deceleration time constant and acceleration are also set as parameters in advance. For example, when a positioning command G00 is designated, the motor is accelerated or decelerated to a designated speed with the acceleration/deceleration time constant or acceleration during the positioning operation. Also, when the cutting feed command G01 is specified, the cutting feed operation is accelerated or decelerated to the specified speed by the acceleration/deceleration time constant or acceleration.
- the first control information allows the control axis to specify a speed up to F8000
- the second control information allows the control axis to specify a speed up to F3000. It is also assumed that the first control information designates ⁇ 1 [s] as the acceleration/deceleration time constant, and the second control information designates ⁇ 2 [s] as the acceleration/deceleration time constant.
- X100F6000 is specified in the line of sequence number N100 in the machining program.
- X80F2800 is specified in the row of sequence number N200.
- X50F1500 is specified in the row of sequence number N300. It is assumed that threshold 2500 is stored in threshold storage unit 213 .
- the control information determination unit 215 compares the value 6000 specified by the F code with the threshold value 2500 when the command specified in the row of sequence number N100 is executed. The feedrate specified by the F code in this line is greater than the threshold. Therefore, the control information determination unit 215 determines the first control information as the control information when the line N100 is executed. Also, the acceleration time when line N100 is executed is ⁇ 1 [s] (see FIG. 9).
- the control information determination unit 215 compares the value 2800 specified by the F code with the threshold value 2500 when the command specified in the row of sequence number N200 is executed.
- the feedrate specified by the F code in this line is greater than the threshold. Therefore, the control information determining unit 215 determines the first control information as the control information when the line N200 is executed.
- the control information determination unit 215 since the value 2800 specified by the F code exceeds the threshold value, the control information determination unit 215 has determined the first control information as the control information. However, since it is within the range of the upper limit speed 3000 of the control axis of the second control information, there is no problem even if the second control information is selected in terms of the machine configuration and the operation of the control axis. Therefore, the control information determination unit 215 determines the acceleration time of the control axis when the control axis is controlled based on the first control information, and the acceleration time of the control axis when the control axis is controlled based on the second control information. Compare with time. When the first control information is set, the acceleration time to reach the feed speed F2800 is ⁇ 1. On the other hand, assuming that the second control information is set, the time required for the feed speed of the control axis to reach F2800 is ⁇ 2 [s], which is shorter than ⁇ 1 [s].
- the control information determination unit 215 changes the once determined first control information to the second control information.
- the machining cycle time can be shortened by ( ⁇ 1 ⁇ 2) [s].
- the control information determination unit 215 compares the value 1500 specified by the F code with the threshold value 2500 when the command specified in the row of sequence number N300 is executed. The feedrate specified by the F code in this line is below the threshold. Therefore, the control information determination unit 215 determines the second control information as the control information when the line N300 is executed.
- the acceleration time of the control axis when the control axis is controlled based on the first control information and the control axis based on the second control information are Compare with the acceleration time of the control axis under control.
- this comparison may also be made when N100 lines are executed and when N300 lines are executed.
- the acceleration/deceleration time constant is included in the first control information and the second control information.
- the control information may include the acceleration in the first control information or the second control information, and use the acceleration ⁇ to compare the acceleration times.
- the first control information includes an acceleration/deceleration time constant and does not include acceleration
- the second control information does not include an acceleration/deceleration time constant but includes acceleration.
- the first control information does not include the acceleration/deceleration time constant and includes the acceleration
- the second control information includes the acceleration/deceleration time constant and does not include the acceleration. may be set.
- control information determination unit 215 compares the speed command specified in the machining program with the threshold value, determines the control information based on the comparison result, and then determines the acceleration time of the control axis. Based on this, the determined control information is changed.
- the control information determining unit 215 determines the control information by comparing the ratio between the speed command before switching and the speed command after switching when the speed command is switched, that is, the speed ratio and the threshold value. , the determined control information may be changed based on the acceleration time of the control axis.
- one of the plurality of pieces of control information stored in the control information storage unit 214 is based on a speed command specifying the feed speed of the control axis or a movement command derived from the speed command. to decide.
- the control information determination unit 215 determines the first control information as control information when the positioning command G00 is specified, and controls when the cutting feed command G01 is specified, as in the conventional case.
- a mode for determining the second control information may be provided as the information. That is, the numerical control device 2 has a plurality of control modes. In the first mode, the control information determination unit 215 determines the speed command specifying the feed speed of the control axis or the movement command derived from the speed command.
- one of the plurality of pieces of control information stored in the control information storage unit 214 may be determined.
- the numerical controller 2 responds to one control command or cutting feed command corresponding to the positioning command based on the positioning command G00 or the cutting feed command G01 specified by the machining program.
- One control command may be determined.
- machine tool 2 numerical controller 201 CPU 202 bus 203 ROM 204 RAMs 205 non-volatile memory 206 interface 207 axis control circuit 208 spindle control circuit 209 PLC 210 I/O unit 211 program storage unit 212 program analysis unit 213 threshold storage unit 214 control information storage unit 215 control information determination unit 216 control information setting unit 217 control unit 3 input/output device 4 servo amplifier 5 servo motor 6 spindle amplifier 61 ammeter 7 spindle motor 8 auxiliary equipment
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Abstract
Description
2 数値制御装置
201 CPU
202 バス
203 ROM
204 RAM
205 不揮発性メモリ
206 インタフェース
207 軸制御回路
208 スピンドル制御回路
209 PLC
210 I/Oユニット
211 プログラム記憶部
212 プログラム解析部
213 しきい値記憶部
214 制御情報記憶部
215 制御情報決定部
216 制御情報設定部
217 制御部
3 入出力装置
4 サーボアンプ
5 サーボモータ
6 スピンドルアンプ
61 電流計
7 スピンドルモータ
8 補助機器
Claims (8)
- 工作機械の制御軸を制御するための複数の制御情報を記憶する制御情報記憶部と、
前記制御軸の送り速度を指定する速度指令、または、前記速度指令から導出される移動指令に基づいて、前記制御情報記憶部に記憶された前記複数の制御情報のうち一の制御情報を決定する制御情報決定部と、
前記制御情報決定部によって決定された前記一の制御情報に基づいて前記制御軸を制御する制御部と、
を備える数値制御装置。 - 導出される前記移動指令は、位置決め指令、および切削送り指令を含み、
導出される前記移動指令が前記位置決め指令である場合、前記制御情報決定部は前記位置決め指令に対応する前記一の制御情報を決定し、
導出される前記移動指令が前記切削送り指令である場合、前記制御情報決定部は前記切削送り指令に対応する前記一の制御情報を決定する請求項1に記載の数値制御装置。 - 導出される前記移動指令は、第1の切削送り指令、および第1の切削送り指令とは異なる第2の切削送り指令を含み、
導出される前記移動指令が前記第1の切削送り指令である場合、前記制御情報決定部は前記第1の切削送り指令に対応する前記一の制御情報を決定し、
導出される前記移動指令が前記第2の切削送り指令である場合、前記制御情報決定部は前記第2の切削送り指令に対応する前記一の制御情報を決定する請求項1に記載の数値制御装置。 - 導出される前記移動指令は、第1の位置決め指令、および第1の位置決め指令とは異なる第2の位置決め指令を含み、
導出される前記移動指令が前記第1の位置決め指令である場合、前記制御情報決定部は前記第1の位置決め指令に対応する前記一の制御情報を決定し、
導出される前記移動指令が前記第2の位置決め指令である場合、前記制御情報決定部は前記第2の位置決め指令に対応する前記一の制御情報を決定する請求項1に記載の数値制御装置。 - 前記複数の制御情報は、それぞれ、ポジションゲイン、フィードフォワード係数、加減速時定数、および、機能のオン/オフを示す情報の少なくともいずれかを含む請求項1~4のいずれか1項に記載の数値制御装置。
- 前記速度指令は、加工プログラム、パラメータ、外部信号、および外部媒体のいずれかによって指定される請求項1~5のいずれか1項に記載の数値制御装置。
- 前記制御情報決定部は、前記速度指令から導出される前記制御軸の加速時間に基づいて、決定した前記一の制御情報を他の制御情報に変更する請求項1~6のいずれか1項に記載の数値制御装置。
- 工作機械の制御軸の送り速度を指定する速度指令、または、前記速度指令から導出される移動指令に基づいて、工作機械の制御軸を制御するための複数の制御情報のうち一の制御情報を決定することと、
決定された前記一の制御情報に基づいて前記制御軸を制御することと、
をコンピュータに実行させる命令を記憶するコンピュータ読み取り可能な記憶媒体。
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CN202180097798.4A CN117242410A (zh) | 2021-05-12 | 2021-05-12 | 数值控制装置以及计算机可读取的存储介质 |
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JP2001309678A (ja) * | 2000-04-21 | 2001-11-02 | Dyadic Systems Co Ltd | サーボモータの駆動制御方法と制御装置 |
JP5240412B1 (ja) * | 2012-02-08 | 2013-07-17 | 三菱電機株式会社 | 数値制御装置 |
JP2019037081A (ja) * | 2017-08-18 | 2019-03-07 | 株式会社シブヤ | 電動工具用発電機 |
JP6740483B1 (ja) * | 2018-11-29 | 2020-08-12 | 三菱電機株式会社 | 数値制御装置および数値制御方法 |
JP2021039648A (ja) * | 2019-09-05 | 2021-03-11 | ファナック株式会社 | 機械学習装置、サーボ制御装置、サーボ制御システム及び機械学習方法 |
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JP2001309678A (ja) * | 2000-04-21 | 2001-11-02 | Dyadic Systems Co Ltd | サーボモータの駆動制御方法と制御装置 |
JP5240412B1 (ja) * | 2012-02-08 | 2013-07-17 | 三菱電機株式会社 | 数値制御装置 |
JP2019037081A (ja) * | 2017-08-18 | 2019-03-07 | 株式会社シブヤ | 電動工具用発電機 |
JP6740483B1 (ja) * | 2018-11-29 | 2020-08-12 | 三菱電機株式会社 | 数値制御装置および数値制御方法 |
JP2021039648A (ja) * | 2019-09-05 | 2021-03-11 | ファナック株式会社 | 機械学習装置、サーボ制御装置、サーボ制御システム及び機械学習方法 |
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