Machine tool, power consumption estimation method, and computer program

Abstract

Provided are a machine tool, a power consumption estimation method, and a computer program with which it is possible to obtain the power consumption of an electrical device without using a power meter. A machine tool 100 according to the present disclosure is characterized by comprising: electrical devices (a pump 13, a pump 14, and a pump 60) that receive alternating current; and an estimation unit (a control unit provided in a control device 72) that estimates the amount of power consumed by the electrical equipment on the basis of the voltage and frequency of the AC power received by the electrical equipment. The estimation unit estimates the amount of power consumed by the electrical device on the basis of the voltage and frequency of the AC power received by the electrical device, so that the amount of power consumed by the electrical device can be obtained without using a power meter.

Description

Technical Field

[0001] This disclosure relates to a machine tool, a method for estimating electrical power consumption, and a computer program. Background Technology

[0002] In the machine tool described in Patent Document 1, a cumulative power meter accumulates the electrical power received by the machine tool. Based on the cumulative result of the cumulative power meter, the machine tool calculates the total electrical power used within a predetermined period.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2002-243776 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] Patent document 1 mentions replacing the cumulative power meter with an indicating power meter, but does not mention omitting the power meter used to directly calculate the power quantity.

[0008] The purpose of this disclosure is to provide a machine tool, a method for estimating power consumption, and a computer program that can determine the power consumption of electrical equipment without using a power meter.

[0009] Technical means to solve the problem

[0010] The machine tool disclosed herein is characterized by including: an electrical device for receiving alternating current; and an estimation unit for estimating the power consumption of the electrical device based on the voltage and frequency of the alternating current received by the electrical device.

[0011] In this disclosure, the electrical equipment receives alternating current.

[0012] The estimation unit estimates the electrical power consumption of the electrical equipment based on the voltage and frequency of the alternating current received by the equipment. Therefore, the electrical power consumption of the equipment can be calculated without using a power meter.

[0013] The machine tool disclosed herein is characterized in that it further includes a detection unit that detects the voltage and the frequency, and the estimation unit estimates the power consumption based on the detection results of the detection unit.

[0014] In this disclosure, the testing department tests the voltage and frequency of the alternating current received by the electrical equipment.

[0015] The estimation department estimates the electrical power consumption of electrical equipment based on the testing results from the testing department.

[0016] Since users and manufacturers no longer need to set the voltage and frequency values ​​for estimation based on the location or operating environment of the machine tool, convenience is improved. Furthermore, it prevents estimation errors in power consumption caused by forgetting or incorrectly setting the voltage and frequency. Moreover, even when the voltage or frequency of the AC power fluctuates during machine tool operation, the accuracy of power consumption estimation for electrical equipment is improved.

[0017] The machine tool disclosed herein is characterized in that it further includes a storage unit, which stores the following equation (1) and constants a, b, and c for calculating the power consumption W based on the voltage V and the frequency f, and the estimation unit estimates the power consumption based on the following equation (1) and the constants stored in the storage unit.

[0018]

[0019] In this disclosure, the storage unit stores equation (1) and constants a, b, and c.

[0020] The estimation department estimates the electrical power consumption of electrical equipment based on equation (1) and constants a, b, and c stored in the storage department.

[0021] By approximating the power consumption of electrical appliances using a simple linear equation, calculations for estimating power consumption can be performed easily. Constants a, b, and c can be determined, for example, experimentally.

[0022] The machine tool disclosed herein is characterized in that it further includes a timing unit that times the working time of the electrical equipment, and an estimation unit that estimates the power consumption based on the voltage, the frequency, and the timing result of the timing unit.

[0023] In this disclosure, the timing department measures the working time of the electrical equipment.

[0024] The estimation unit estimates the electrical power consumption of the electrical equipment based on the voltage and frequency of the alternating current received by the electrical equipment and the timing results of the timing unit.

[0025] Since the estimation of electrical equipment power consumption can take into account the actual duration of power consumption, the accuracy of power consumption estimation is improved.

[0026] The machine tool disclosed herein is characterized in that it further includes a temperature detection unit, which detects the temperature at a predetermined location, and the estimation unit estimates the power consumption based on the voltage, the frequency, and the temperature detection result of the temperature detection unit.

[0027] In this disclosure, the temperature detection unit detects the temperature at a predetermined location.

[0028] The estimation unit estimates the electrical power consumption of the electrical equipment based on the voltage and frequency of the alternating current received by the electrical equipment and the temperature detection results from the temperature detection unit.

[0029] The ambient temperature of electrical equipment can sometimes affect its power consumption. Therefore, by considering the temperature detection results of the temperature sensing unit when estimating the power consumption of electrical equipment, the accuracy of the power consumption estimation can be improved.

[0030] The machine tool disclosed herein is characterized in that it includes a plurality of the aforementioned electrical devices, and the estimation unit estimates the power consumption of each of the plurality of electrical devices.

[0031] In this disclosure, the estimation department estimates the power consumption of each of multiple electrical devices. Once the power consumption of each electrical device is known, countermeasures can be taken for each device to avoid unnecessary power consumption.

[0032] The machine tool disclosed herein is characterized by comprising: multiple electrical devices receiving alternating current; a detection unit that uniformly detects the voltage and frequency of the alternating current received by each electrical device; and an estimation unit that estimates the power consumption of each electrical device based on the detection results of the detection unit.

[0033] In this disclosure, the testing department uniformly tests the voltage and frequency of the AC power received by each electrical device. Therefore, the machine tool does not need to include a testing department in each electrical device.

[0034] Based on the testing results from the inspection department, the estimation department estimates the power consumption of each electrical device. Therefore, the power consumption of each electrical device can be calculated without using a power meter. Once the power consumption of each electrical device is known, countermeasures can be taken for each device to avoid unnecessary power consumption.

[0035] Since users and manufacturers no longer need to set the voltage and frequency values ​​for estimation based on the location or operating environment of the machine tool, convenience is improved. Furthermore, it prevents estimation errors in power consumption caused by forgetting or incorrectly setting the voltage and frequency. Moreover, even when the voltage or frequency of the AC power fluctuates during machine tool operation, the accuracy of power consumption estimation for each electrical device is improved.

[0036] The power consumption estimation method disclosed herein is characterized in that it estimates the power consumption of the electrical equipment based on the voltage and frequency of the AC power received by the electrical equipment included in the machine tool and receiving AC power.

[0037] In this disclosure, the machine tool includes electrical equipment. A computer estimates the electrical power consumption of the electrical equipment based on the voltage and frequency of the alternating current received by the equipment. Therefore, the electrical power consumption of the equipment can be determined without using a power meter.

[0038] The computer program disclosed herein is characterized in that it causes the computer to perform the following process: estimating the power consumption of the electrical equipment included in the machine tool and receiving AC power based on the voltage and frequency of the AC power received by the electrical equipment receiving AC power.

[0039] In this disclosure, the power consumption estimation method of this disclosure can be implemented in software using computer hardware.

[0040] [The effects of the invention]

[0041] Based on the machine tool, power consumption estimation method, and computer program disclosed herein, the power consumption of electrical equipment can be determined without using a power meter. Attached Figure Description

[0042] [ Figure 1 [This is a partial 3D view of the machine tool.]

[0043] [ Figure 2 [] is a block diagram representing the main parts of a machine tool.

[0044] [ Figure 3 [] is a block diagram representing the structure of the control device.

[0045] [ Figure 4 [] is a flowchart showing the sequence of power consumption estimation processes performed in a machine tool.

[0046] [ Figure 5 [] is another block diagram representing the main parts of a machine tool.

[0047] [ Figure 6 [] is a block diagram representing the structure of the control device.

[0048] [ Figure 7 [Illustration] is a schematic diagram showing an example of the screen displayed by the display unit. Detailed Implementation

[0049] The embodiments of this disclosure will be described below. In the following description, the arrows in the figures are used to indicate up / down, front / back, and left / right.

[0050] Figure 1The machine tool 100 shown includes a control box 3 and a column 4 on a base 2 supported on the ground. The user operates the machine tool 100 from the front. The column 4 is a vertical support erected at the center of the rear of the base 2 in the left-right direction. The machine tool 100 includes a machining chamber 40 on the front side of the column 4. The machining chamber 40 includes a machining table (not shown) that can move back and forth and left and right. The machine tool 100 processes the workpiece (not shown) on the machining table.

[0051] The column 4 supports the spindle head (not shown) at the front. The spindle head moves up and down along the column 4. The column 4 supports the tool changing device in front of the spindle head. The tool changing device includes a tool storage section and a tool changing mechanism. The tool changing mechanism automatically changes one of the multiple tools held in the tool storage section and the tool mounted on the spindle.

[0052] The control box 3 is installed on the rear side of the column 4.

[0053] Machine tool 100 includes a cleaning fluid unit 10. The cleaning fluid unit 10 includes: a tank 11, a recovery tank 12, a pump 13 (chip washing pump), a pump 14 (cyclone suction pump), and a pump 60 (centrifugal self-priming (CTS) pump). The tank 11 is a box-shaped container that stores the cleaning fluid supplied to the machining chamber 40. The recovery tank 12, pump 13, pump 14, and pump 60 are mounted on the tank 11.

[0054] The cleaning fluid unit 10 can be installed and removed from the rear side of the base 2. A recovery tank 12 recovers the used cleaning fluid. The recovery tank 12 includes a primary filter for primary filtration of the recovered cleaning fluid. The primary filter is plate-shaped and has numerous tiny pores. The tank 11 includes a contaminated tank and a semi-cleaned tank. The contaminated tank is located below the primary filter. The contaminated tank stores the cleaning fluid after filtration based on the primary filter. The contaminated tank and the semi-cleaned tank are adjacent. The cleaning fluid stored in the contaminated tank flows into the semi-cleaned tank after filtration based on a pair of filters. In the pair of filters, the two filters are positioned at a predetermined interval and are opposite each other; each filter is plate-shaped and has numerous pores smaller than those of the primary filter.

[0055] Pumps 13, 14, and 60 draw cleaning fluid from tank 11 and deliver it to processing chamber 40. Pump 13 is used for cleaning processing chamber 40. Processing chamber 40 includes cleaning fluid nozzles (not shown) on its inner wall, and the spray side of pump 13 is connected to the cleaning fluid nozzles. Pump 13 draws cleaning fluid from tank 11 (quasi-cleaning tank) and delivers it to the cleaning fluid nozzles, which spray the cleaning fluid into processing chamber 40. The cleaning fluid flushes away chips in processing chamber 40 towards tank 11 (contamination tank).

[0056] Pump 14 is a pump for tool cleaning. A tool cleaning nozzle (not shown) is provided inside the machining chamber 40, and the spray side of pump 14 is connected to the tool cleaning nozzle via piping. Pump 14 draws cleaning fluid from tank 11 (quasi-cleaning tank) and delivers it via piping to cleaning filter 141 (cyclone filter). Cleaning filter 141 filters the cleaning fluid. The cleaning fluid after filtration by cleaning filter 141 is delivered via piping to storage tank 50. During tool cleaning, the cleaning fluid in storage tank 50 is delivered via piping to the tool cleaning nozzle in machining chamber 40. The tool cleaning nozzle in machining chamber 40 sprays the cleaning fluid from storage tank 50 onto the tool being changed (not shown). The cleaning fluid washes away chips adhering to the tool to be mounted on the spindle.

[0057] Pump 60 is a pump used for both cooling and cleaning of tools and workpieces. The tool has an internal flow path extending from its base to its front end, and the front end of the tool is open. The ejector side of pump 60 is connected to the base of the tool via piping. Pump 60 draws cleaning fluid from tank 11 (quasi-cleaning tank) and delivers it to the tool, which sprays the cleaning fluid from its front end toward the workpiece's machined surface. The cleaning fluid cools and cleans both the tool and workpiece during processing.

[0058] The machine tool 100 may also include a coolant pump. The coolant pump draws cleaning fluid from the tank 11 (quasi-cleaning tank) and delivers the cleaning fluid via piping to nozzles disposed around the tool and workpiece being machined, the nozzles spraying the cleaning fluid toward the tool and workpiece being machined.

[0059] Figure 2 This is a block diagram showing the main parts of the machine tool 100. To simplify the accompanying drawings, Figure 2 Pump 13, Pump 14, and Pump 60 are represented together.

[0060] Pump 13 is an electrical device that includes a pump motor that operates by receiving AC power from AC power supply 700. Similarly, pumps 14 and 60 are also electrical devices that operate by receiving AC power. The main circuit breaker 701 is located between pumps 13, 14, and 60 and AC power supply 700.

[0061] The machine tool 100 includes: a DC power supply 71, a control device 72, a display unit 73, an operation unit 74, and a relay unit 75.

[0062] The DC power supply unit 71 receives AC power from the AC power supply 700 and converts it into DC power. The control unit 72, display unit 73, and operation unit 74 receive DC power from the DC power supply unit 71 via the relay unit 75. The main circuit breaker 701 and the DC power supply unit protection circuit breaker 711 are located between the DC power supply unit 71 and the AC power supply 700.

[0063] Figure 1The control box 3 shown, for example, houses a DC power supply 71, a control device 72, and a relay unit 75.

[0064] Figure 3 This is a block diagram showing the structure of the control device 72.

[0065] The control device 72 includes a main storage unit 81, an auxiliary storage unit 82 (storage unit), a control unit 83, and a clock unit 84. The various parts of the control device 72 are interconnected via a bus.

[0066] The main storage unit 81 is volatile, for example, it is random access memory (RAM).

[0067] The auxiliary storage unit 82 is non-volatile and includes read-only memory (ROM), flash memory, hard disk, solid state drive (SSD), etc.

[0068] The auxiliary storage unit 82 pre-stores computer programs for controlling the operation of the machine tool 100, as well as various data required for the execution of the computer programs.

[0069] The control unit 83 includes one or more processors, such as a central processing unit (CPU), a microprocessor (MPU), or a graphics processing unit (GPU). The control unit 83 uses the main memory 81 as its operating area and performs various arithmetic and control operations according to the computer program stored in the auxiliary memory 82. For example, the control unit 83 performs control operations such as machining operations and automatic tool changes in the machine tool 100. In the control operation of the machining operation, the control unit 83 turns each pump 13, 14, and 60 on / off according to a predetermined timing sequence, based on the computer program used for the machining operation. The control unit 83 may also include logic circuitry (e.g., a field-programmable gate array (FPGA)).

[0070] The clock section 84 measures the current time t.

[0071] Figure 2 The display unit 73 shown is, for example, a liquid crystal display. The operation unit 74 includes operation keys. The display unit 73 and the operation unit 74 may, for example, form an operation panel located on the outer surface of the machining chamber 40. The display unit 73 and the operation unit 74 may also be located on a terminal device carried by the user of the machine tool 100.

[0072] The operation keys of the operation unit 74 can be hardware keys or software keys that are overlaid on the display unit 73. In the case of software keys, the display unit 73 is a touch panel. The operation keys include the power switch of the machine tool 100.

[0073] Knowing the electrical power consumption (Wh) of each of pumps 13, 14, and 60 allows for countermeasures to be taken for each pump to avoid unnecessary power consumption. However, equipping each of pumps 13, 14, and 60 with a power meter would increase the cost of machine tool 100.

[0074] Therefore, the control unit 83 estimates the electrical power Wh consumed by each pump 13, 14, and 60, and displays the estimation results differently on the display unit 73.

[0075] The auxiliary storage unit 82 pre-stores a computer program 85 for estimating the power consumption (Wh) and various data required for the execution of the computer program 85.

[0076] The computer program 85 can utilize the hardware elements of the computer to implement the power consumption estimation method of this embodiment in a software manner, including the following equations (1) and (2).

[0077]

[0078]

[0079] Equation (1) is used to calculate the power consumption W of each pump 13, 14, and 60 based on the voltage V and frequency f of the AC power received by each pump 13, 14, and 60. It was obtained by the inventors through experiments. By approximating the power consumption W using a simple linear equation, the calculation for estimating the power consumption Wh can be performed easily. The units of voltage V, frequency f, and power consumption W are, for example, [V (volts)], [Hz (hertz)], and [W (watts)]. The range of voltage V and frequency f to which equation (1) can be applied is, for example, 160≦V[V]≦280 and 49≦f[Hz]≦61, and more ideally 180≦V[V]≦253 and 50≦f[Hz]≦60. In the experiment, the error between the estimated value and the measured value using equation (1) for each pump 13, 14, and 60 was about 4.4%, which is very practical.

[0080] Equation (2) is used to calculate the power consumption Wh of each pump 13, 14, and 60 based on the power consumption W of each pump 13, 14, and 60 and the working time h of each pump 13, 14, and 60. The units of working time h and power consumption Wh are, for example, [h (hours)] and [Wh (watt-hours)].

[0081] The auxiliary storage unit 82 stores constants a, b, and c in association with each of the pumps 13, 14, and 60. Constants a, b, and c can be determined experimentally for each of the pumps 13, 14, and 60, and are assigned to the machine tool 100 by the manufacturer during the manufacturing process.

[0082] In addition, after the machine tool 100 leaves the factory, the constants a, b, and c can be assigned to the machine tool 100 by the manufacturer or user operating the operation unit 74. (1) Equation or constants a, b, and c can also be downloaded from an external source (e.g., a server) by the control unit 83.

[0083] like Figure 2 As shown, the DC power supply device 71 includes a detection unit 712. The detection unit 712 detects the voltage and frequency of the AC power received from the AC power supply 700. The voltage value is, for example, the RMS value. The detection unit 712 is not a power meter used to directly calculate the power consumption of each pump 13, 14, 60 based on the current and voltage.

[0084] The voltage and frequency detected by the detection unit 712 are equal to the AC voltage V and frequency f received by each pump 13, 14, and 60. That is, the detection unit 712 uniformly detects the voltage V and frequency f related to each pump 13, 14, and 60.

[0085] Generally, electricity consumption is calculated based on current and voltage. Even if the same voltage is applied to each of pumps 13, 14, and 60, the current flowing in each pump will vary depending on factors such as the capacitance of each pump, the operating environment, and the concentration of the cleaning fluid, the temperature of the room where the machine tool is used, and the diameter of the piping. Therefore, when calculating the electrical power consumption of each pump 13, 14, and 60 based on current and voltage, it is necessary to include three power meters for each of the three pumps 13, 14, and 60, or one voltmeter and three ammeters.

[0086] On the other hand, the voltage V and frequency f associated with each of the pumps 13, 14, and 60 are equal. Therefore, only one detection unit 712 is needed to uniformly detect the voltage V and frequency f of the AC power received by each of the pumps 13, 14, and 60. Furthermore, the detection unit 712 can be a voltmeter and a frequency meter, one for each pump.

[0087] Figure 4 This is a flowchart showing the sequence of power consumption estimation processes performed by machine tool 100. Control unit 83 executes the power consumption estimation process according to computer program 85. Hereinafter, the process for estimating the power consumption Wh of pump 13 will be illustrated.

[0088] The control unit 83 determines whether to change the pump 13 from off to on (S11). If the pump 13 remains off (NO in S11), the process returns to S11.

[0089] When pump 13 is turned on (YES in S11), control unit 83 starts timing the elapsed time hb (S12). In S12, control unit 83 may start timing the elapsed time hb by incrementing the number of clocks received by control unit 83, or by turning on the timer included in control device 72.

[0090] The control unit 83 determines whether it is the time to estimate the electrical power Wh consumed by the pump 13 (S13). The time to estimate the electrical power Wh consumed is, for example, the time point when the elapsed time hb reaches or exceeds the predetermined time hc (e.g., 0.1 [msec]).

[0091] In order to estimate the timing of the power consumption Wh of pump 13 (in S13), control unit 83 acquires the detection result of detection unit 712 (i.e., the voltage V and frequency f of the AC power received by pump 13) (S14).

[0092] After the processing in S14 is completed, the control unit 83 estimates the power consumption W of the pump 13 (S15). In S15, the control unit 83 substitutes the constants a, b, and c stored in the auxiliary storage unit 82, as well as the voltage V and frequency f of the alternating current obtained in S14, into the equation (1) stored in the auxiliary storage unit 82, thereby calculating the power consumption W.

[0093] After the processing in S15 is completed, the control unit 83 estimates the electrical power Wh consumed by the pump 13 (S16). In S16, the control unit 83 substitutes the working time h and the electrical power W calculated in S15 into equation (2) stored in the auxiliary storage unit 82, thereby calculating the electrical power Wh consumed. Here, the working time h that should be substituted into equation (2) is the time obtained by converting the unit of elapsed time hb to [h] (when the elapsed time hb is 0.1 [msec], the working time h is approximately 2.8 × 10⁻⁸ [h]).

[0094] The control unit 83 writes information related to the power consumption Wh calculated in S16 into the auxiliary storage unit 82 (S17). In S17, the information written by the control unit 83 into the auxiliary storage unit 82 includes, for example, the power consumption Wh, the cumulative operating time ha (ha = ha + hb), and the cumulative power consumption Wha (Wha = Wha + Whb). Here, Whb is the power consumption Wh estimated in S16 corresponding to the elapsed time hb. The control unit 83 writes the power consumption Wh, the cumulative operating time ha, and the cumulative power consumption Wha into the auxiliary storage unit 82, for example, in association with information from the identification pump 13 and the time t measured by the clock unit 84. The control unit 83 may also write the power consumption W and the operating time h into the auxiliary storage unit 82.

[0095] The control unit 83 resets the elapsed time hb timing result (S18) and continues timing the elapsed time hb.

[0096] The control unit 83 displays information related to the power consumption Wh calculated in S16 on the display unit 73 (S19). In S19, the control unit 83 displays the power consumption Wh on the display unit 73 in the form of a bar chart or line chart with time t as the horizontal axis and power consumption Wh as the vertical axis.

[0097] After the processing in S19 is completed, or if it is not the time sequence for estimating the power consumption Wh of pump 13 (no in S13), the control unit 83 determines whether to switch pump 13 from on to off (S20).

[0098] If pump 13 remains on (not in S20), control unit 83 returns processing to S13.

[0099] When pump 13 is shut off (yes in S20), control unit 83 ends the timing of elapsed time hb (S21) and ends the power consumption estimation process.

[0100] During the operation of machine tool 100, control unit 83 repeatedly performs power consumption estimation processing.

[0101] By using a graph to display the electrical power consumption (Wh) of pump 13, the user of the visual recognition display unit 73 can intuitively grasp the amount of electrical power consumed (Wh). Furthermore, by using time t as the horizontal axis, the user can intuitively grasp the passage of electrical power consumption (Wh) over time.

[0102] Furthermore, the control unit 83 is not limited to displaying the power consumption (Wh) using a graph; for example, it can also display the power consumption (Wh) digitally. Additionally, the control unit 83 can calculate the cumulative power consumption (Wh) for each predetermined time period (e.g., every hour from the start to the end of work) and display it on the display unit 73. The control unit 83 can also calculate the cumulative power consumption (Wh) from a predetermined time point to the current time point and display it on the display unit 73.

[0103] The control unit 83 is not limited to a structure that displays the power consumption Wh each time the power consumption Wh is estimated. For example, it may also be a structure that displays the power consumption Wh when the user performs a predetermined operation using the operation unit 74.

[0104] Control unit 83 performs the same operation as pumps 14 and 60. Figure 4 The same power consumption estimation process is used as shown. For the power consumption Wh of each pump 13, 14, 60, the control unit 83 displays, for example, a stacked bar chart or a set bar chart with time t as the horizontal axis and power consumption Wh as the vertical axis on the display unit 73.

[0105] Furthermore, the control unit 83 can also display the total electrical power consumption (Wh) of each of the pumps 13, 14, and 60 on the display unit 73. This display is not limited to showing the electrical power consumption (Wh) of each pump 13, 14, and 60 in a way that makes them distinct from each other; for example, it could also be a display showing the total electrical power consumption (Wh) of two of the pumps 13, 14, and 60 separately from the electrical power consumption (Wh) of another pump. The graph is not limited to a bar graph or a line graph; for example, it could be a circular graph showing the ratio of the electrical power consumption (Wh) of each pump 13, 14, and 60 to the total electrical power consumption of the machine tool 100.

[0106] Based on the machine tool 100 described above, the electrical power consumption (Wh) of each pump 13, 14, and 60 can be calculated without using a power meter.

[0107] The control unit 83 in S15 and S16 of the power consumption estimation process functions as the estimation unit in the embodiment. From the start of the working time h in S12 to the end of the working time h in S21, the control unit 83 functions as the timing unit in the embodiment.

[0108] It should be estimated that the electrical equipment of Wh is not limited to pumps 13, 14, and 60, but may also include spindle motors, lighting fixtures, etc. Furthermore, it may also include pumps other than pumps 13, 14, and 60.

[0109] Constants a, b, and c can be shared in multiple pumps 13, 14, and 60.

[0110] Machine tool 100 may include multiple detection units instead of detection unit 712. For example, three detection units may detect the voltage V and frequency f associated with the three pumps 13, 14, and 60 in a one-to-one correspondence. However, the structure of machine tool 100 is simplified when the detection units 712 uniformly detect the voltage V and frequency f associated with pumps 13, 14, and 60.

[0111] The voltage V and frequency f of the AC power received by each of the pumps 13, 14, and 60 can also be set by the manufacturer or user on the machine tool 100. The voltage V and frequency f set by the manufacturer or user are stored, for example, in the auxiliary storage unit 82. In this case, the detection unit 712 can be omitted. However, with the detection unit 712 present, the user or manufacturer does not need to set the voltage V and frequency f values ​​for the machine tool 100 according to the region where the machine tool 100 is installed or the operating environment of the machine tool 100, thus improving convenience for the user and manufacturer. Furthermore, it prevents estimation errors in power consumption Wh caused by forgetting to set or incorrectly setting the voltage V or frequency f. Moreover, even if the voltage V or frequency f changes during the use of the machine tool 100, the estimation accuracy of power consumption Wh is improved.

[0112] The control unit 83 performs multiple processes, including estimating the power consumption (Wh) and displaying the estimation results. These multiple processes can be performed by a single processor included in the control unit 83, or they can be performed distributed among multiple processors included in the control unit 83. The processor performing the estimation process and the processor performing the display process can exist independently.

[0113] The control unit 83 may also substitute a fixed working time h into equation (2) instead of timing the working time h. However, by using the timed working time h, the actual power consumption time of each pump 13, 14, and 60 can be taken into account, thus improving the estimation accuracy of the power consumption Wh of each pump 13, 14, and 60.

[0114] The formulas for estimating the electrical energy consumed (Wh) are not limited to formulas (1) and (2).

[0115] The power consumption estimation method of this embodiment is not limited to a structure implemented by the computer (control device 72) included in the machine tool 100. An external computer (e.g., a server having computer program 85 and constants a, b, and c) can also receive voltage V, frequency f, and operating time h from the machine tool 100 to estimate the power consumption Wh.

[0116] Figure 5 This is a block diagram showing the main parts of the machine tool 100A in Embodiment 2.

[0117] Machine tool 100A is substantially the same as machine tool 100 of Embodiment 1, except that it includes control device 72A instead of control device 72. Hereinafter, the differences from Embodiment 1 will be described. In addition, structural elements that are the same as those in Embodiment 1 will be marked with the same symbols, and their descriptions will be omitted.

[0118] The control device 72A is substantially the same as the control device 72 of Embodiment 1, except that it includes the temperature detection unit 741. The temperature detection unit 741 detects the temperature at a predetermined location. Ideally, the temperature measurement result of the temperature detection unit 741 can replace the temperature of the surrounding environment of pumps 13, 14, and 60. In this embodiment, the temperature detection unit 741 is installed on the printed circuit board included in the operation unit 74 and detects the temperature near the operation unit 74.

[0119] Figure 6 This is a block diagram showing the structure of the control device 72A.

[0120] Computer program 85 includes the following formula (3) instead of formula (1) of implementation method 1.

[0121]

[0122] Equation (3) was obtained by the inventors through experiments, and it is equal to equation (1) plus the fourth term "dT". The fourth term "dT" is obtained by multiplying the temperature T at the predetermined location by the constant d.

[0123] The auxiliary storage unit 82 also stores constants a, b, c, and d in association with each of the pumps 13, 14, and 60. Constant d can be determined experimentally in the same way as constants a, b, and c, and is assigned to the machine tool 100A by the manufacturer during its manufacture.

[0124] The control unit 83 of this embodiment also performs... Figure 4 The power consumption estimation process is shown. In S14, the control unit 83 acquires the detection results of the detection unit 712 (i.e., the voltage V and frequency f of the AC power received by each pump 13, 14, 60) and the temperature detection results of the temperature detection unit 741 (i.e., the temperature T at the predetermined position).

[0125] The control unit 83 in S15 substitutes the constants a, b, c, and d stored in the auxiliary storage unit 82, as well as the voltage V, frequency f, and temperature T of the alternating current obtained in S14, into equation (3) stored in the auxiliary storage unit 82, thereby calculating the power consumption W.

[0126] The ambient temperature of pumps 13, 14, and 60 can sometimes affect the electrical power consumption (Wh) of each pump. Therefore, by taking into account the temperature detection results of the temperature detection unit 741 when estimating the electrical power consumption (Wh), the estimation accuracy of the electrical power consumption (Wh) of each pump 13, 14, and 60 is improved.

[0127] Alternatively, machine tool 100A may include multiple temperature sensing units instead of temperature sensing unit 741. For example, three temperature sensing units may be used to detect the temperature of the surrounding environment near the three pumps 13, 14, and 60 in a one-to-one correspondence. However, when temperature sensing unit 741 detects the temperature T at a predetermined location, the structure of machine tool 100A is simple.

[0128] Figure 7 This is a schematic diagram showing an example of the screen displayed by the display unit 73.

[0129] The control unit 83 displays a stacked bar chart on the display unit 73. The horizontal axis represents the hourly time period from 0:00 to 23:59 of the current day. The vertical axis represents the cumulative estimated power consumption (Wh) of each pump 13, 14, and 60 for each time period. A bar chart with a shading line sloping downwards to the right represents pump 13, a blank bar chart represents pump 14, and a bar chart with a shading line sloping upwards to the right represents pump 60.

[0130] Having estimated the electrical power consumption (Wh) of each pump 13, 14, and 60, as well as the electrical power consumption (Wh) of the spindle motor, lighting fixtures, etc., the control unit 83 can also add bar charts representing the spindle motor, lighting fixtures, etc. Figure 7 The stacked bar chart shown is displayed in the display section 73.

[0131] The embodiments disclosed herein should be considered illustrative in all respects and not limiting. The scope of the invention is not intended to be descriptive, but is intended to include the scope equivalent to the claims and all modifications within the claims.

[0132] The constituent elements (technical features) disclosed in each embodiment can be combined with each other, and new technical features can be formed through combination. Furthermore, the independent claims and supplementary claims recited in the claims can be combined with each other in all combinations, regardless of their referencing form. Moreover, the claims may use a form that refers to two or more other claims (multiple-claim form), but are not limited to this. A multiple-claim form that refers to at least one multiple claim (multiple-claim form) may also be used.

[0133] Explanation of icon numbers

[0134] 100, 100A: Machine tools

[0135] 13, 14, 60: Pumps (electrical equipment)

[0136] 712: Testing Department

[0137] 741: Temperature inspection department

[0138] 82: Auxiliary Storage Department (Storage Department)

[0139] 83: Control Department (Estimation Department, Timing Department)

[0140] 85: Computer Programs

Claims

1. A machine tool, characterized in that, include: Electrical equipment that receives alternating current; as well as The estimation unit estimates the power consumption of the electrical equipment based on the voltage and frequency of the alternating current received by the electrical equipment.

2. The machine tool according to claim 1, characterized in that, It also includes a detection unit that detects the voltage and the frequency. The estimation unit estimates the power consumption based on the detection results of the detection unit.

3. The machine tool according to claim 1 or 2, characterized in that, It also includes a storage unit that stores the following equation (1) and constants a, b, and c, which are used to calculate the power consumption W based on the voltage V and the frequency f. The estimation unit estimates the consumed electrical energy based on the following equation (1) stored in the storage unit and the constant: 。 4. The machine tool according to claim 1 or 2, characterized in that, It also includes a timing unit that times the operating time of the electrical equipment. The estimation unit estimates the power consumption based on the voltage, the frequency, and the timing results of the timing unit.

5. The machine tool according to claim 1 or 2, characterized in that, It also includes a temperature detection unit, which detects the temperature at a predetermined location. The estimation unit estimates the power consumption based on the voltage, the frequency, and the temperature detection result of the temperature detection unit.

6. The machine tool according to claim 1 or 2, characterized in that, Includes multiple of the aforementioned electrical devices, The estimation unit estimates the power consumption of each of the plurality of electrical devices.

7. A machine tool, characterized in that, include: Multiple electrical devices receive alternating current; The testing department is responsible for the unified testing of the voltage and frequency of the AC power received by various electrical devices. as well as The estimation unit estimates the power consumption of each electrical device based on the detection results of the detection unit.

8. A method for estimating power consumption, characterized in that, Based on the voltage and frequency of the AC power received by the electrical equipment included in the machine tool and receiving AC power, the power consumption of the electrical equipment is estimated.

9. A computer program, characterized in that, The computer performs the following process: based on the voltage and frequency of the AC power received by the electrical equipment included in the machine tool and receiving AC power, it estimates the power consumption of the electrical equipment.

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