WO2023181399A1

WO2023181399A1 - Numerical control device

Info

Publication number: WO2023181399A1
Application number: PCT/JP2022/014621
Authority: WO
Inventors: 八起高嶋
Original assignee: ファナック株式会社
Priority date: 2022-03-25
Filing date: 2022-03-25
Publication date: 2023-09-28

Abstract

The present invention makes it possible to more accurately calculate the power consumption of a peripheral device in simulation of a machining program, and derive a machining condition that maximizes a power consumption reduction effect.　This numerical control device comprises: an input unit for inputting a machining program and a maximum allowable machining time; a machining program simulation execution unit for simulating the operation of a machine tool on the basis of the machining program; a PLC simulation execution unit for simulating the operation of a peripheral device on the basis of the machining program; a storage unit for storing, as a device power consumption profile, the power consumption by each peripheral device according to the control state of the peripheral device; and a power-saving machining parameter calculation unit for varying a machining parameter and causing the machining program simulation execution unit and the PLC simulation execution unit to execute simulations for each machining parameter, predicting power consumption on the basis of the simulation results, the maximum allowable machining time and the device power consumption profile, and calculating and presenting the machining parameter with the minimum power consumption.

Description

numerical control device

The present invention relates to a numerical control device.

With increasing interest in SDGs, there is an increasing demand for reducing power consumption in cutting processing of machine tools.
In order to reduce power consumption, improvements to machine design (for example, reducing the weight of moving objects, etc.), power saving during standby, production planning to reduce peak power consumption by monitoring power on the production line, and improvement of machine tools. Efforts are being made to achieve both stable accuracy and power savings on a single unit.
In this regard, prior to running the machining program, machining information including machine tool information of the machine tool, auxiliary motion information of auxiliary motion equipment, work information, and machining information including the machining program to be run from now on can be input into the learned model. Obtain power consumption information including the total power consumption during program operation and the power consumption of each block during machining program operation, and calculate the total power consumption during program operation and the power consumption of each block during machining program operation. Techniques for predicting are known. For example, see Patent Document 1.
Further, there is known a technology for a control device for a machine tool that has a power consumption reduction function that can reduce the power consumption of the entire machine tool including peripheral devices. For example, see Patent Document 2.

JP 2021-86405 Publication Japanese Patent Application Publication No. 2010-240800

In order to achieve maximum production volume (shorten cycle time), machining programs are created to shorten machining time by even one second, and when executed, high-speed processing such as rapid forwarding is executed to shorten idle time (time other than machining). be done. Generally, it is thought that the shorter the cycle time, the lower the power consumption, so shortening the cycle time also leads to power savings.
However, excessive acceleration/deceleration and high-speed movement of the cutting spindle and feed axis may shorten the cycle time, but may also consume a large amount of power. Furthermore, adjustment of processing conditions by engineers at the production site is complicated and difficult.
In addition, although Patent Documents 1 and 2 estimate the power consumption of a machining program, in simulations that do not involve actual machining, there is insufficient consideration of the power consumption of peripheral devices, such as setting the power consumption of peripheral devices to a constant value. are doing.

Therefore, it is desired to calculate the power consumption of peripheral devices more accurately in simulation of a machining program and find machining conditions that maximize the power consumption reduction effect.

One aspect of the numerical control device of the present disclosure includes an input unit for inputting at least a machining program and a maximum allowable machining time of a machine tool that operates based on the machining program; a machining program simulation execution unit that simulates the operation of the machine tool; a PLC simulation execution unit that simulates the operation of at least one peripheral device arranged around the machine tool based on the machining program; a storage unit that stores predicted power consumption of each peripheral device as a device power consumption profile; and a processing program simulation execution unit and a PLC simulation execution unit that change machining parameters for each of the changed machining parameters. to predict the power consumption based on the simulation results of the machining program simulation execution unit and the PLC simulation execution unit, the maximum allowable machining time, and the device power consumption profile, and out of the predicted power consumption. A power-saving machining parameter calculation unit that calculates the machining parameter with the minimum power consumption and presents the calculated machining parameter.

According to one aspect, power consumption of peripheral devices can be calculated with higher accuracy in simulation of a machining program, and machining conditions that maximize the power consumption reduction effect can be determined.

FIG. 1 is a functional block diagram showing an example of a functional configuration of a numerical control system according to an embodiment. FIG. 3 is a diagram showing an example of a user interface for inputting a machining program and maximum allowable machining time. FIG. 3 is a diagram illustrating an example of a device power consumption profile. It is a figure which shows an example of a speed command value when changing a process parameter. FIG. 3 is a diagram illustrating an example of the relationship between machining time and power consumption according to changes in machining parameters. FIG. 3 is a diagram illustrating an example of a user interface that presents minimum power consumption processing. It is a flowchart explaining processing parameter determination processing of a virtual numerical control device. It is a flowchart explaining processing processing of a numerical control system. 9 is a flowchart illustrating detailed processing contents of the power measurement process shown in step S22 in FIG. 8.

An embodiment of the present disclosure will be described below with reference to the drawings.
<One embodiment>
FIG. 1 is a functional block diagram showing an example of the functional configuration of a numerical control system according to an embodiment.
As shown in FIG. 1, the numerical control system 1 includes a virtual numerical control device 10 as a digital twin, a real numerical control device 20, and a power meter 30.

The virtual numerical control device 10, the real numerical control device 20, and the power measuring device 30 may be directly connected to each other via a connection interface (not shown). Furthermore, the virtual numerical control device 10 and the real numerical control device 20 may be connected to each other via a network (not shown) such as a LAN (Local Area Network) or the Internet. In this case, the virtual numerical control device 10 and the real numerical control device 20 are equipped with a communication section (not shown) for communicating with each other through such a connection.
Note that, as described later, although the virtual numerical control device 10 and the real numerical control device 20 are different devices, they may be one numerical control device. Further, when the machine tool (not shown) controlled by the virtual numerical control device 10 and the real numerical control device 20 is a robot or the like, the virtual numerical control device 10 and the real numerical control device 20 may be a robot control device or the like.

<Power meter 30>
The power measuring device 30 measures the power consumption of a spindle amplifier, feed shaft amplifier, etc. of a machine tool (not shown) controlled by a real numerical control device 20, which will be described later, and also measures power consumption by a PLC device 210 included in the real numerical control device 20. The power consumption of peripheral devices (not shown) such as controlled circulation pumps and cooling fans is measured. The power measuring device 30 outputs the measured power consumption to the real numerical control device 20.
Note that in FIG. 1, one power meter 30 is connected to the real numerical control device 20, but the present invention is not limited to this. A plurality of power measuring instruments 30 may be arranged in peripheral devices (not shown) such as a spindle amplifier, a feed shaft amplifier, a circulation pump, a cooling fan, etc. of a machine tool (not shown), and may be connected to the real numerical control device 20.

<Virtual numerical control device 10>
The virtual numerical control device 10 is a known computer or the like. As will be described later, the virtual numerical control device 10 is, for example, an illustration in which the real numerical control device 20 executes the machining program while changing the machining parameters so that the machining time is less than or equal to the inputted machining program and the maximum allowable machining time. The operation of the machine tool and peripheral equipment (not shown) is simulated, and the predicted power consumption of the machine tool and peripheral equipment (not shown) is calculated for each machining parameter. The virtual numerical control device 10 outputs, to the real numerical control device 20, the machining parameter with the minimum power consumption among the power consumption calculated for each machining parameter. Thereby, the real numerical control device 20 can control machine tools and peripheral equipment (not shown) with minimum power consumption.
As shown in FIG. 1, the virtual numerical control device 10 includes an input section 110, a control section 120, and a storage section 130. Further, the control unit 120 includes a PLC simulation execution unit 121, a machining program simulation execution unit 122, and a power saving machining parameter calculation unit 123.

<Input section 110>
The input unit 110 is, for example, a touch panel placed in front of a keyboard, a liquid crystal display, etc., and inputs a machining program and a maximum permissible machining time of a machine tool (not shown) that operates according to the machining program based on input operations by the user. Enter .
FIG. 2 is a diagram showing an example of a user interface for inputting a machining program and maximum allowable machining time.
As shown in FIG. 2, the user interface includes an input field for inputting a machining program (NC program) to be executed, and an estimated fastest speed of a machine tool (not shown) based on the input machining program estimated by a machining program simulation execution unit 122 described later. It has a display field for machining time, an input field for inputting the maximum allowable machining time, etc.

<Storage unit 130>
The storage unit 130 is an SSD (Solid State Drive), an HDD (Hard Disk Drive), or the like. The storage unit 130 stores a machining program 131, a device power consumption profile 132, and a machining parameter 133, as well as an operating system and application programs executed by the control unit 120.
The machining program 131 is, for example, a machining program input by the user via the user interface shown in FIG.

The device power consumption profile 132 is, for example, a file in which expected power consumption per unit time is recorded according to a control state (PLC signal state) of a peripheral device (not shown) by the real numerical control device 20 described later.
In other words, as in Patent Document 1, it was possible to predict the power consumption of the axis control of the cutting spindle and feed axis associated with the workpiece cutting block and non-cutting block by simulation using a numerical control device, but it is possible to predict the power consumption of the axis control of the cutting spindle and feed axis associated with the workpiece cutting block and non-cutting block. It was difficult to calculate the power consumed by peripheral devices.
Therefore, in this embodiment, the power consumption during operation of these peripheral devices is stored as a device power consumption profile 132 in the storage unit 130, which is an estimated power consumption according to the control state (PLC signal state) of the peripheral device.

FIG. 3 is a diagram illustrating an example of the device power consumption profile 132.
As shown in FIG. 3, the device power consumption profile 132 has storage areas for "device name", "device control state", "expected power consumption", and "power meter".
The "device name" storage area in the device power consumption profile 132 stores, for example, device names such as "circulation pump" and "cooling fan."
In the storage area of "device control state" in the device power consumption profile 132, for example, "Y31.0=TRUE", "Y31.0=TRUE", ""Y31.0=FALSE","M_TEMP<31","M_TEMP>=31", etc. are stored. Note that "Y31.0=TRUE" indicates the control state in which the circulation pump (not shown) connected to the output terminal Y31 of the PLC device 210 is in operation, and "Y31.0=FALSE" indicates the control state in which the circulation pump (not shown) connected to the output terminal Y31 of the PLC device 210 is in operation. A circulating pump (not shown) connected to the output terminal Y31 is in a standby control state. Furthermore, "M_TEMP<31" indicates the control state of the cooling fan (not shown) when the temperature is less than 31 degrees, and "M_TEMP>=31" indicates the control state of the cooling fan (not shown) when the temperature is 31 degrees or higher. ) control status.
The "expected power consumption" storage area in the device power consumption profile 132 stores the expected power consumption for each control state of the "device control state", for example, "1 kW", "0.2 kW", "2 kW", "3kW" etc. are stored.
In the storage area of "wattmeter" in the device power consumption profile 132, for example, "pom2-ch1", "NA", etc., indicating the power measuring device 30 arranged for each peripheral device of "device name" are stored. Ru. Note that "pom2-ch1" is a combination of "pom2" indicating the power meter 30 placed in the circulation pump and "ch1" indicating one channel among the plurality of channels that the power meter 30 has. be.

The machining parameters 133 are, for example, parameters indicating machining conditions when the real numerical control device 20 (described later) executes the machining program 131. Specifically, the machining parameters 133 include, for example, an override parameter indicating the ratio when the rapid traverse speed specified in the machining program 131 is taken as 100%, and an acceleration/deceleration rate and acceleration/deceleration method for reaching the target speed. and acceleration/deceleration parameters indicating.

The control unit 120 includes a CPU, ROM, RAM, CMOS memory, etc., which are configured to be able to communicate with each other via a bus, which are well known to those skilled in the art.
The CPU is a processor that controls the virtual numerical control device 10 as a whole. The CPU reads the system program and application program stored in the ROM via the bus, and controls the entire virtual numerical control device 10 according to the system program and application program. Thereby, as shown in FIG. 1, the control section 120 is configured to realize the functions of the PLC simulation execution section 121, the machining program simulation execution section 122, and the power saving machining parameter calculation section 123. Various data such as temporary calculation data and display data are stored in the RAM. The CMOS memory is backed up by a battery (not shown) and is configured as a nonvolatile memory that maintains its storage state even when the virtual numerical control device 10 is powered off.

The PLC simulation execution unit 121 simulates the operation of peripheral equipment (not shown) based on the input machining program 131 using a known method. That is, the PLC simulation execution unit 121 simulates the control state (PLC signal state) for peripheral equipment (not shown) based on the machining program 131. Based on the device power consumption profile 132, the PLC simulation execution unit 121 predicts the power consumption of peripheral devices (not shown) by adding the expected power consumption according to the simulated control state (PLC signal state).

The machining program simulation execution unit 122 uses a known method (for example, Patent Document 2) to include feedback information of the drive unit of the machine tool (not shown) based on the input machining program 131 and machining parameters 133. The operation of a machine tool (not shown) is simulated. That is, the machining program simulation execution unit 122 pseudo-calculates a torque value that the real numerical control device 20 (described later) outputs to a machine tool (not shown) in the simulation, and adjusts the consumption of the machine tool (not shown) based on the calculated torque value. Simulate power.

The power-saving machining parameter calculation unit 123 changes the machining parameters 133, causes the PLC simulation execution unit 121 and the machining program simulation execution unit 122 to execute the simulation for each changed machining parameter 133, and causes the PLC simulation execution unit 121 and the machining program to execute the simulation. The power consumption is predicted based on the simulation result of the program simulation execution unit 122 and the device power consumption profile 132, and in addition, the machining parameter 133 of the power consumption that is the minimum among the predicted power consumption that is less than or equal to the maximum allowable machining time is calculated, and the calculated machining parameters 133 are presented.
Specifically, the power-saving machining parameter calculation unit 123 calculates machining parameters 133 (which are trial machining conditions) in order to calculate conditions that minimize power consumption when operating a machine tool (not shown) based on a machining program. For example, override parameters, acceleration/deceleration parameters, etc.) are searched for using Bayesian optimization, genetic algorithms, etc. Note that if the predicted power consumption value increases significantly from the predicted value at the start, the search for the optimal machining parameters 133 may be discontinued.

FIG. 4 is a diagram showing an example of the speed command value when the machining parameter 133 is changed. In FIG. 4, the solid line shows the speed command value as it is in the machining program 131 input without changing the machining parameter 133, and the broken line shows the speed command value when the machining parameter 133 is changed. That is, as shown in FIG. 4, the speed command value when the machining parameter 133 is changed accelerates gently and reaches a lower speed than the speed command value when the machining program 131 is unchanged.
The power-saving machining parameter calculation unit 123 causes the PLC simulation execution unit 121 and the machining program simulation execution unit 122 to execute a simulation for each changed machining parameter 133, and predicts machining time T _cur and power consumption P _cur . . Note that the power-saving machining parameter calculation unit 123 calculates the machining time and power consumption predicted by the simulation of the PLC simulation execution unit 121 and the machining program simulation execution unit 122 using the input machining program 131 without changing the machining parameters 133. , machining time T _min and power consumption P _std .

FIG. 5 is a diagram illustrating an example of the relationship between machining time T _cur and power consumption P _cur depending on changes in machining parameter 133.
As shown in FIG. 5, the power saving machining parameter calculation unit 123 calculates the input power consumption P _cur predicted by the simulation of the PLC simulation execution unit 121 and the machining program simulation execution unit 122 for each changed machining parameter 133. The machining parameter 133 that provides the minimum power consumption P _min within the maximum allowable machining time T _max is calculated (selected). Then, the power-saving machining parameter calculation unit 123 displays the calculated (selected) machining parameters 133 (machining conditions) and machining time T _cur on a display unit (not shown) such as a liquid crystal display included in the virtual numerical control device 10. Display and present to the user.

FIG. 6 is a diagram illustrating an example of a user interface that presents minimum power consumption processing.
As shown in FIG. 6, the user interface includes a display field that displays the machining time T _cur (machining time when power consumption reduction is applied) when the minimum power consumption P _min is reached, and the presented machining parameter 133 (power consumption It has a selection field etc. for selecting whether to apply the reduction parameter). Note that the user interface may include a display column showing how much power consumption can be reduced by applying the presented processing parameters 133.
When the power-saving machining parameter calculation unit 123 receives an input as to whether or not to apply the machining parameters 133 presented by the user via the user interface of FIG. Output to 20.

<Real numerical control device 20>
The real numerical control device 20 is a numerical control device known to those skilled in the art, and generates commands based on a machining program 231 and machining parameters 233, which will be described later, and transmits the generated commands to a machine tool and peripheral equipment (not shown). Thereby, the real numerical control device 20 controls the operation of the machine tool and peripheral equipment (not shown).
As shown in FIG. 1, the real numerical control device 20 includes a PLC device 210, a control section 220, and a storage section 230. The control unit 220 includes a machining program execution unit 221.

<Storage unit 230>
The storage unit 230 is a storage unit such as an SSD or an HDD. The storage unit 230 stores a processing program 231, device power consumption measurement results 232, and processing parameters 233, as well as an operating system and application programs executed by the control unit 220, which will be described later.
The machining program 231 is the machining program 131 input via the input unit 110 of the virtual numerical control device 10.
The device power consumption measurement result 232 includes the control state of the PLC device 210 when the peripheral device (not shown) operates based on the control of the PLC device 210, which will be described later, and the power consumption of the peripheral device (not shown) measured by the power meter 30. are files stored in association with each other. Note that, as described later, the virtual numerical control device 10 acquires the device power consumption measurement result 232, compares the device power consumption profile 132 with the acquired device power consumption measurement result 232, and compares the device power consumption profile 132 with the device power consumption measurement result 232. The device power consumption profile 132 may be corrected by using the difference (deviation amount) from the power consumption measurement result 232 as an error amount.
By doing so, the virtual numerical control device 10 can more accurately calculate the machining parameters 133 that minimize power consumption.
The machining parameters 233 are the machining conditions acquired from the virtual numerical control device 10, that is, the machining parameters 133 to which power consumption reduction is applied (or not applied).

<PLC device 210>
The PLC device 210 is a PLC well known to those skilled in the art, and controls the operation of peripheral devices (not shown) based on a machining program 231. Further, the PLC device 210 receives from the power meter 30 the power consumption of a peripheral device (not shown) measured by the power meter 30 as the peripheral device (not shown) operates, and determines the control state of the PLC device 210 based on the received power consumption. The device power consumption measurement result 232 is stored in association with the device power consumption measurement result 232.

<Control unit 220>
The control unit 220 includes a CPU, ROM, RAM, CMOS memory, etc., which are configured to be able to communicate with each other via a bus, which are well known to those skilled in the art.
The CPU is a processor that controls the real numerical control device 20 as a whole. The CPU reads the system program and application program stored in the ROM via the bus, and controls the entire real numerical control device 20 according to the system program and application program. Thereby, as shown in FIG. 1, the control section 220 is configured to realize the functions of the machining program execution section 221.

The machining program execution unit 221 controls the operation of a machine tool (not shown) based on the machining program 231 and machining parameters 233.

<Machining parameter determination process of virtual numerical control device 10>
Next, with reference to FIG. 7, the flow of processing parameter determination processing of the virtual numerical control device 10 will be explained.
FIG. 7 is a flowchart illustrating processing parameter determination processing of the virtual numerical control device 10. The flow shown here is repeatedly executed every time the machining program 131 and maximum allowable machining time are input.

In step S1, the input unit 110 inputs the machining program 131 via the user interface of FIG. 2 based on the user's input operation.

In step S2, the input unit 110 inputs the maximum allowable machining time T _max via the user interface of FIG. 2 based on the user's input operation.

In step S3, the machining program simulation execution unit 122 executes a simulation of the operation of the machine tool (not shown) based on the machining program 131 input in step S1 and the machining parameters 133 that have not been changed. Furthermore, the PLC simulation execution unit 121 executes a simulation of the operation of a peripheral device (not shown) based on the machining program 131 input in step S1.

In step S4, the machining program simulation execution unit 122 obtains a machining time T _std of a machine tool (not shown).

In step S5, the machining program simulation execution unit 122 calculates machining power consumption of a machine tool (not shown). Furthermore, the PLC simulation execution unit 121 calculates the power consumption of peripheral devices (not shown) by adding the expected power consumption according to the simulated control state (PLC signal state) based on the device power consumption profile 132.

In step S6, the power-saving machining parameter calculation unit 123 adds together the machining power consumption of the machine tool (not shown) calculated in step S5 and the power consumption of the peripheral equipment (not shown) to obtain power consumption P _std .

In step S7, the power saving machining parameter calculation unit 123 holds the power consumption P _std when the machining parameter 133 acquired in step S6 is not changed as the power consumption P _min .

In step S8, the power-saving machining parameter calculation unit 123 searches and determines the machining parameters 133, which are trial machining conditions, by Bayesian optimization, genetic algorithm, or the like.

In step S9, the machining program simulation execution unit 122 executes a simulation of the operation of the machine tool (not shown) based on the machining program 131 input in step S1 and the machining parameters 133 retrieved (determined) in step S8. Furthermore, the PLC simulation execution unit 121 executes a simulation of the operation of a peripheral device (not shown) based on the machining program 131 input in step S1.

In step S10, the machining program simulation execution unit 122 obtains a machining time T _cur of a machine tool (not shown).

In step S11, the machining program simulation execution unit 122 calculates the machining power consumption of a machine tool (not shown), and the PLC simulation execution unit 121 adjusts the simulated control state (PLC signal state) based on the device power consumption profile 132. The power consumption of peripheral devices (not shown) is calculated by adding the corresponding expected power consumption.

In step S12, the power-saving machining parameter calculation unit 123 adds the machining power consumption of the machine tool (not shown) calculated in step S11 and the power consumption of the peripheral equipment (not shown) to obtain power consumption P _cur .

In step S13, the power-saving machining parameter calculation unit 123 determines whether the machining time T _cur calculated in step S10 is larger than the maximum allowable machining time T _max . If the machining time T _cur is larger than the maximum allowable machining time T _max , the power-saving machining parameter calculation unit 123 ends the machining parameter determination process and calculates the minimum power consumption P _min held in step S15, which will be described later. Calculate (select) machining parameters 133. As shown in FIG. 6, the power-saving machining parameter calculation unit 123 displays the calculated (selected) machining parameters 133 (machining conditions) and machining time T _cur on the display unit (not shown) of the virtual numerical control device 10. and present it to the user.
On the other hand, if the machining time T _cur is less than or equal to the maximum allowable machining time T _max , the process proceeds to step S14.

In step S14, the power saving machining parameter calculation unit 123 determines whether the minimum power consumption P _min so far is larger than the power consumption P _cur obtained in step S12. If the minimum power consumption P _min is greater than the power consumption P _cur , the process proceeds to step S15. On the other hand, if the minimum power consumption P _min is less than or equal to the power consumption P _cur , the process returns to step S8.

In step S15, the power saving machining parameter calculation unit 123 holds the power consumption P _cur acquired in step S12 as the minimum power consumption P _min . The process then returns to step S8.

<Processing of numerical control system 1>
Next, the processing flow of the numerical control system 1 will be explained with reference to FIG.
FIG. 8 is a flowchart illustrating processing processing of the numerical control system 1. The flow shown here is repeatedly executed every time the machining program 131 is input.

In step S20, after the machining parameter determination process shown in FIG. 233).

In step S21, the real numerical control device 20 (machining program execution unit 221 and PLC device 210) executes the machining program 231 based on the machining parameters 233 acquired in step S20, and operates the machine tool and peripheral equipment (not shown). , perform processing.

In step S22, the virtual numerical control device 10 performs power measurement processing via the real numerical control device 20 and corrects the device power consumption profile 132. Note that the detailed flow of the power measurement process will be described later.
Furthermore, the processing in step S21 and the processing in step S22 may be executed in parallel or may be processed in chronological order.

FIG. 9 is a flowchart illustrating detailed processing contents of the power measurement process shown in step S22 in FIG.

In step S221, the virtual numerical control device 10 (power-saving processing parameter calculation unit 123) obtains the device power consumption measurement result 232 from the real numerical control device 20.

In step S222, the virtual numerical control device 10 (power saving processing parameter calculation unit 123) takes measures in the device power consumption profile 132 based on the wattmeter of the power meter 30 indicated by the device power consumption measurement result 232 acquired in step S221. Search for peripheral devices.

In step S223, the virtual numerical control device 10 (power-saving processing parameter calculation unit 123) acquires the control state (IO) of the PLC device 210 indicated by the device power consumption measurement result 232.

In step S224, the virtual numerical control device 10 (power saving processing parameter calculation unit 123) calculates the expected power consumption of the device power consumption profile 132 corresponding to the control state obtained in step S223 in the peripheral device searched in step S222, An error amount that is a difference (deviation) from the actual power consumption indicated by the device power consumption measurement result 232 is calculated.

In step S225, the virtual numerical control device 10 (power-saving processing parameter calculation unit 123) switches the peripheral device from which power is to be obtained.

In step S226, the virtual numerical control device 10 (power-saving machining parameter calculation unit 123) determines whether machining of the machine tool (not shown) by the real numerical control device 20 has been completed. If the machining is completed, the process advances to step S227. On the other hand, if the machining is not completed, the process returns to step S221. That is, the virtual numerical control device 10 (power-saving machining parameter calculation unit 123) repeatedly monitors power consumption while the machining program 231 is being executed, and calculates the amount of error between the control state of each peripheral device and the expected power consumption. get.

In step S227, the virtual numerical control device 10 (power-saving processing parameter calculation unit 123) corrects the expected power consumption of the device power consumption profile 132 based on the error amount calculated in step S224 for each peripheral device. Note that the virtual numerical control device 10 (power-saving processing parameter calculation unit 123) may reflect the results of a moving average filter or coefficient calculation at this time.

As described above, the virtual numerical control device 10 according to one embodiment calculates the power consumption P _cur of the machine tool and peripheral equipment (not shown) based on the machining program 131 for each changed machining parameter 133, The machining parameter 133 at which the power consumption P _min is the minimum among _cur is calculated (selected), and the calculated (selected) machining parameter 133 and machining time T _cur are displayed on the display section (not shown) of the virtual numerical control device 10. ) and present it to the user. Thereby, the virtual numerical control device 10 can more accurately calculate the power consumption of peripheral devices in the simulation of the machining program 131, and can determine machining conditions that maximize the power consumption reduction effect.
In addition, since the virtual numerical control device 10 searches for the optimal machining parameters 133 according to the production volume plan by repeatedly executing simulations, the user (NC program creator, production planner, etc.) is burdened with adjusting the machining parameters. can be reduced.

Although one embodiment has been described above, the virtual numerical control device 10 is not limited to the above-described embodiment, and includes modifications, improvements, etc. within a range that can achieve the purpose.

<Modified example>
In one embodiment, the virtual numerical control device 10 and the real numerical control device 20 are different devices from each other, but they may be one numerical control device. Furthermore, the virtual numerical control device 10 and the real numerical control device 20 may be included in a machine tool (not shown).

Note that each function included in the virtual numerical control device 10 in one embodiment can be realized by hardware, software, or a combination thereof. Here, being realized by software means being realized by a computer reading and executing a program.

The program can be stored and delivered to a computer using various types of non-transitory computer readable media. Non-transitory computer-readable media include various types of tangible storage media. Examples of non-transitory computer-readable media are magnetic recording media (e.g., flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (e.g., magneto-optical disks), CD-ROMs (Read Only Memory), CD-ROMs, R, CD-R/W, semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM). The program may also be provided to the computer on various types of transitory computer readable media. Examples of transitory computer-readable media include electrical signals, optical signals, and electromagnetic waves. The temporary computer-readable medium can provide the program to the computer via wired communication channels such as electrical wires and optical fibers, or via wireless communication channels.

Note that the step of writing a program to be recorded on a recording medium includes not only processes that are performed in chronological order, but also processes that are not necessarily performed in chronological order but are executed in parallel or individually. It also includes.

In other words, the numerical control device of the present disclosure can take various embodiments having the following configurations.

(1) The virtual numerical control device 10 of the present disclosure includes an input unit 110 for inputting at least a machining program 131 and a maximum permissible machining time of a machine tool that operates based on the machining program 131; A machining program simulation execution unit 122 that simulates the operation of the machine tool based on the machining program 131, a PLC simulation execution unit 121 that simulates the operation of at least one peripheral device arranged around the machine tool based on the machining program 131, and peripheral device control. A storage unit 130 stores predicted power consumption of each peripheral device according to the state as a device power consumption profile 132, a machining program simulation execution unit 122 and a machining program simulation execution unit 122 for changing machining parameters 133 and The PLC simulation execution unit 121 executes the simulation, and the power consumption is predicted based on the simulation results of the machining program simulation execution unit 122 and the PLC simulation execution unit 121, the maximum allowable machining time, and the device power consumption profile 132. It includes a power-saving machining parameter calculation unit 123 that calculates a machining parameter 133 that consumes the least amount of power and presents the calculated machining parameter 133.

According to this virtual numerical control device 10, it is possible to more accurately calculate the power consumption of peripheral devices in the simulation of a machining program, and to determine the machining conditions that maximize the power consumption reduction effect.

(2) In the virtual numerical control device 10 described in (1), the power consumption of the device power consumption profile 132 is calculated based on the calculated machining parameters 133 and the machining program 131 when the peripheral devices are actually operated. It may be corrected based on the difference from the measured power consumption.
By doing so, the virtual numerical control device 10 can predict power consumption of peripheral devices with higher accuracy.

(3) In the virtual numerical control device 10 described in (1) or (2), the processing parameters 133 may include at least an override parameter and an acceleration/deceleration parameter.
By doing so, the virtual numerical control device 10 can easily change the processing conditions.

1 Numerical control system 10 Virtual numerical control device 110 Input section 120 Control section 121 PLC simulation execution section 122 Machining program simulation execution section 123 Power-saving machining parameter calculation section 130 Storage section 131 Machining program 132 Device power consumption profile 133 Machining parameters 20 Real numerical values Control device 210 PLC device 220 Control unit 221 Machining program execution unit 230 Storage unit 231 Machining program 232 Device power consumption measurement result 233 Machining parameter 30 Power measuring instrument

Claims

an input unit for inputting at least a machining program and a maximum allowable machining time of a machine tool that operates based on the machining program;
a machining program simulation execution unit that simulates the operation of the machine tool based on the machining program;
a PLC simulation execution unit that simulates the operation of at least one peripheral device arranged around the machine tool based on the machining program;
a storage unit that stores predicted power consumption of each peripheral device according to a control state of the peripheral device as a device power consumption profile;
Changing the machining parameters, causing the machining program simulation execution unit and the PLC simulation execution unit to execute a simulation for each of the changed machining parameters, and comparing the simulation results of the machining program simulation execution unit and the PLC simulation execution unit with the A saving method that predicts power consumption based on the maximum allowable machining time and the device power consumption profile, calculates the machining parameter with the minimum power consumption among the predicted power consumption, and presents the calculated machining parameter. A power processing parameter calculation unit,
A numerical control device equipped with.
The power consumption of the device power consumption profile is corrected based on the difference between the power consumption measured when the peripheral device is actually operated based on the calculated machining parameters and the machining program, The numerical control device according to claim 1.
The numerical control device according to claim 1 or 2, wherein the processing parameters include at least an override parameter and an acceleration/deceleration parameter.