Machine tool
By setting up a single power meter and control device in the machine tool, the power consumption of each power confirmation object is measured and calculated, and the problem of difficulty in accurately estimating power consumption among multiple power confirmation objects is solved, and high-precision power consumption measurement and advance failure are achieved Early warning reduces downtime.
Patent Information
- Application Number
- CN202280096344.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2022-09-27
- Publication Date
- 2024-12-31
AI Technical Summary
The prior art is difficult to estimate the power consumption of each power confirmation object with high accuracy in a machine tool with multiple power confirmation objects, especially when a plurality of drive shafts and a simple operation mechanism, which makes it difficult to accurately grasp the power consumption.
A machine tool is designed, and a single power meter is arranged in the circuit for power supply to all power confirmation objects, and is equipped with a control device. The power confirmation objects are operated one by one through the measurement control unit, and the power meter detection value during its operation is obtained, and the measurement is determined. The reference power consumption of each power confirmation object is achieved by subtracting the power consumption of the simple operation mechanism by the calculation control unit, and calculates the current power consumption of the servo mechanism to achieve high-precision estimation.
High-precision power consumption measurement and estimation of multiple power confirmation objects is realized, measurement errors are reduced, deterioration and life changes of power confirmation objects can be discovered in a timely manner, and the user is notified in advance to replace or maintain, reducing downtime.
Smart Images
Figure CN119234190A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a machine tool. Background Art
[0002] The following technology is proposed (see, for example, Patent Document 1): In a system in which power is supplied from a distribution board to a plurality of electrical devices, the current waveform and voltage waveform measured by the distribution board are received, and the power consumption of the electrical device (power confirmation object) is estimated based on the current waveform of the electrical device. Patent Document 1 also proposes correcting power based on the power consumption pattern of each electrical device.
[0003] Prior art literature
[0004] Patent Literature
[0005] Patent Document 1: Japanese Patent Application Publication No. 2015-102526 Summary of the invention
[0006] Problem that the invention aims to solve
[0007] Sometimes, it is desired to estimate the power consumption of each power confirmation object in a machine tool having a plurality of power confirmation objects, wherein the plurality of power confirmation objects include a plurality of drive axes and a simple motion mechanism. However, in the method described in Patent Document 1, there is a possibility that the power consumption cannot be accurately grasped due to deterioration of the power confirmation object, etc.
[0008] Solutions for solving problems
[0009] A machine tool involved in one embodiment of the present disclosure comprises: a plurality of power confirmation objects; a single power meter, which is arranged in a circuit that supplies power to all of the power confirmation objects; and a control device, which controls the plurality of power confirmation objects, wherein the control device has a measurement control unit, which measures the baseline power consumption of each of the power confirmation objects by operating the power confirmation objects one by one and obtaining the detection value of the power meter during the operation of the power confirmation objects.
[0010] Effects of the Invention
[0011] According to the present disclosure, power consumption can be grasped with high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a block diagram showing the structure of a machine tool according to one embodiment of the present disclosure. DETAILED DESCRIPTION
[0013] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Figure 11 is a block diagram showing the structure of a machine tool 1 according to an embodiment of the present disclosure. In the figure, solid arrows indicate circuits for supplying power, and dotted arrows indicate paths for transmitting information (wireless is also possible).
[0014] The machine tool 1 includes a single power meter 10, a power circuit 20, a plurality of power check objects 31 to 37, and a control device 40. The machine tool 1 drives the power check objects 31 to 37 with power supplied from an AC power source S to perform machining.
[0015] The power meter 10 is provided in a circuit that supplies power to all power confirmation objects 31 to 37. In the present embodiment, the power meter 10 is provided in a circuit that supplies power from an AC power source S to a power circuit 20, which is used to distribute power to all power confirmation objects 31 to 37. In order to accurately measure the power consumption of the power confirmation objects 31 to 37, the power meter 10 is preferably provided in a circuit that does not supply power to devices that are not controlled by the control device 40. The power meter 10 can be any power meter that can detect power or detect a value that can calculate power. As an example, the power meter 10 can also be configured to detect a current value that can calculate power by multiplying the voltage value of the AC power source S.
[0016] The power circuit 20 converts AC power supplied from the AC power source S into DC power of a voltage required by the power check targets 31 to 37 and the control device 40. The power circuit 20 may output a plurality of different voltages in accordance with the specifications of the power check targets 31 to 37 and the control device 40.
[0017] The power confirmation objects 31 to 37 are power consumption components controlled by the control device 40. The power confirmation objects 31 to 37 include servo mechanisms 31 to 35 that are feedback controlled and simple action mechanisms (cooling fan 36 and cutting fluid pump 37) that are not feedback controlled. The servo mechanisms 31 to 35 each include a motor M and an amplifier A that drives the motor M. The servo mechanisms 31 to 35 are drive mechanisms of drive shafts (including a spindle) that respectively move a tool and a workpiece relative to each other.
[0018] The control device 40 controls the actions of the power confirmation objects 31 to 37. Specifically, the control device 40 has a processing control unit 41, a measurement control unit 42, a calculation control unit 43, a power consumption storage unit 44, a notification unit 45, a threshold setting unit 46, and a life estimation unit 47. The control device 40 can be implemented by one or more computer devices that have a memory, a processor, an input and output interface, etc., and execute an appropriate control program. In the present embodiment, the control device 40 is a so-called numerical control device. The above-mentioned components of the control device 40 are obtained by classifying the functions of the control device 40, and may not be components that can be clearly distinguished in terms of physical structure and program structure.
[0019] The processing control unit 41 controls the operation of the power check objects 31 to 37 according to a processing program described by, for example, a G code, etc. The processing control unit 41 can be configured similarly to a processing control unit in a known numerical control device.
[0020] The measurement control unit 42 measures the reference power consumption of each power confirmation object 31 to 37 by operating the power confirmation objects 31 to 37 one by one and acquiring the detection value of the power meter 10 during the operation of the power confirmation objects 31 to 37. Preferably, the measurement control unit 42 measures the reference power consumption of at least all of the servo mechanisms 31 to 35 in the power confirmation objects 31 to 37 one by one in sequence. At this time, in order to reduce the measurement error, it is preferred that the measurement control unit 42 operates the servo mechanisms 31 to 35 under certain conditions. Specifically, the measurement control unit 42 can be configured to operate the servo mechanisms 31 to 35 at a specified torque set for each servo mechanism, for example, at a rated torque, in order to measure the reference power consumption.
[0021] The measurement control unit 42 is preferably configured to operate the power confirmation objects 31 to 37 at a predetermined timing, such as when the machine tool 1 is started. As the timing of the operation of the power confirmation objects 31 to 37 for measuring the reference power consumption, in order to suppress the reduction in the operating rate of the machine tool 1 caused by the measurement of the reference power consumption, it can be set, for example, when the machine tool 1 is started or stopped after a predetermined time has passed since the last measurement of the reference power consumption. The specific interval for measuring the reference power consumption can be set, for example, to be more than one week and less than three months.
[0022] In this way, by operating the power confirmation objects 31 to 37 one by one by the measurement control unit 42 and measuring the power consumption when the power confirmation objects 31 to 37 are operated under the predetermined input conditions, that is, the reference power consumption, it is possible to grasp the reference power consumption that reflects the change in power consumption due to the degradation of the power confirmation objects 31 to 37. The control device 40 can estimate the power consumption of the power confirmation objects 31 to 37 based on the input value for operating the power confirmation objects 31 to 37, but by correcting the estimated value of the power consumption during processing in consideration of the change in the reference power consumption, it is possible to estimate the power consumption of the power confirmation objects 31 to 37 with high accuracy.
[0023] The calculation control unit 43 calculates the current power consumption of the simple motion mechanisms 36 and 37 by subtracting the power consumption of the power confirmation objects (servo mechanisms) 31 to 35 other than the simple motion mechanisms 36 and 37 from the detection value of the power meter 10 during the operation of the plurality of power confirmation objects 31 to 37 including the simple motion mechanisms 36 and 37. Thus, even for the simple motion mechanisms 36 and 37 whose power consumption cannot be estimated based on the input value, the actual power consumption can be estimated with high accuracy. The calculation control unit 43 can also be configured to calculate the power consumption of the simple motion mechanisms 36 and 37 when the processing control unit 41 is performing the processing operation. In addition, in order to more accurately calculate the power consumption of the simple motion mechanisms 36 and 37, the calculation control unit 43 can also cause the servo mechanisms 31 to 35 to operate under the same conditions as when the reference power consumption is measured by the measurement control unit 42. The simple motion mechanisms 36 and 37 that are controlled to be turned on and off are considered to always consume a constant amount of power. Therefore, the power consumption of the simple motion mechanisms 36 and 37 calculated by the calculation control unit 43 can be regarded as the power consumption in the standard motion state, that is, the reference power consumption.
[0024] The power consumption storage unit 44 stores the reference power consumption measured by the measurement control unit 42 and the power consumption calculated by the calculation control unit 43 for each power check target 31 to 37. This allows the user to easily check whether the power consumption amount changes due to the deterioration of the power check targets 31 to 37.
[0025] When the baseline power consumption exceeds the power threshold set for each power confirmation object, the notification unit 45 notifies this to the outside. Even if the load is constant, the baseline power consumption of the power confirmation objects 31 to 37 may increase due to a failure or the end of their life. The power threshold is a value that is judged to be a high possibility of failure or the end of the life of the power confirmation objects 31 to 37 when the baseline power consumption of the power confirmation objects 31 to 37 is greater than this value. In other words, when the baseline power consumption of the power confirmation objects 31 to 37 increases, the machine tool 1 requires the user to replace or maintain the power confirmation objects 31 to 37. The power threshold can be configured to be input by the user, but is preferably configured to be automatically set or updated by the threshold setting unit 46.
[0026] The threshold setting unit 46 sets the power threshold used by the notification unit 45. Specifically, the threshold setting unit 46 can be configured to set the power threshold of the power confirmation objects 31 to 37 after replacement based on the reference power consumption immediately before replacement when the power confirmation objects 31 to 37 are replaced. By setting the reference power consumption when the power confirmation objects 31 to 37 are replaced, that is, when the user determines that the power confirmation objects 31 to 37 need to be replaced as the power threshold, it is possible to urge the power confirmation objects 31 to 37 to be replaced when they have deteriorated to the same degree as when the user replaces them.
[0027] In addition, the threshold setting unit 46 may set the power threshold of each power confirmation object 31 to 37 based on a plurality of reference power consumptions stored in the power consumption storage unit 44 immediately before multiple replacements of the power confirmation objects 31 to 37. That is, for each power confirmation object 31 to 37, a more appropriate power threshold can be set by, for example, setting the power threshold of the average value of the reference power consumptions immediately before multiple replacements in the past.
[0028] The life estimation unit 47 estimates the life of each power confirmation object 31 to 37 based on a plurality of reference power consumptions stored in the power consumption storage unit 44 for the power confirmation object 31 to 37. Specifically, the life estimation unit 47 calculates the time until the reference power consumption of each power confirmation object 31 to 37 is predicted to reach the power threshold value, based on the time change of the reference power consumption of each power confirmation object 31 to 37. By notifying the user of the time until the reference power consumption is predicted to reach the power threshold value, replacement parts for the power confirmation objects 31 to 37 can be prepared at an appropriate time, thereby minimizing downtime.
[0029] As described above, the machine tool 1 according to the present embodiment measures the reference power consumption of the power confirmation objects 31 to 37 by the measurement control unit 42 , and can therefore relatively accurately determine the replacement timing of the power confirmation objects 31 to 37 and accurately estimate the actual power consumption of the power confirmation objects 31 to 37 .
[0030] The following supplementary notes are further disclosed regarding the above-mentioned embodiment and modified examples.
[0031] (Note 1)
[0032] A machine tool (1) comprises: a plurality of power confirmation objects (31-37); a single power meter (10) provided in a circuit for supplying power to all the power confirmation objects (31-37); and a control device (40) for controlling the plurality of power confirmation objects (31-37), wherein the control device (40) comprises a measurement control unit (42) for measuring reference power consumption of each power confirmation object (31-37) by operating the power confirmation objects (31-37) one by one and acquiring detection values of the power meter (10) during the operation of the power confirmation objects (31-37).
[0033] (Note 2)
[0034] The measurement control unit (42) may activate the power confirmation targets (31 to 37) at a predetermined timing.
[0035] (Note 3)
[0036] The control device (40) may further include a notification unit (45) for notifying the outside of the fact that the reference power consumption exceeds a power threshold value set for each power confirmation target (31 to 37).
[0037] (Note 4)
[0038] Alternatively, the control device (40) further includes a threshold setting unit (46) which, when the power confirmation object (31-37) is replaced, sets a power threshold of the power confirmation object (31-37) after replacement based on a baseline power consumption immediately before replacement.
[0039] (Note 5)
[0040] Alternatively, the control device (40) further includes: a power consumption storage unit (44) that stores reference power consumption for each power confirmation object (31 to 37); and a life estimation unit (47) that estimates the life of the power confirmation object (31 to 37) based on a plurality of reference power consumptions.
[0041] (Note 6)
[0042] The plurality of power confirmation targets (31 to 37) may include a servo mechanism (31 to 35), and the servo mechanism (31 to 35) may include a motor (M) and an amplifier (A).
[0043] (Note 7)
[0044] It is also possible that the multiple power confirmation objects (31 to 37) include a simple action mechanism (36, 37) that is not subjected to feedback control, and the control device (40) also has a calculation control unit (43), which calculates the current power consumption of the simple action mechanism (36, 37) by subtracting the power consumption of the power confirmation objects (31 to 35) other than the simple action mechanism (36, 37) from the detection value of the power meter (10) during the operation period of the multiple power confirmation objects (31 to 37) including the simple action mechanism (36, 37).
[0045] The present disclosure is described in detail above, but the present disclosure is not limited to the above-mentioned embodiments. The above-mentioned embodiments can be variously added, replaced, changed, or partially deleted without departing from the scope of the gist of the present disclosure or the scope of the purpose of the present disclosure derived from the contents recorded in the claims and their equivalents. In addition, in the above-mentioned embodiments, the order of each action and the order of each process are shown as an example and are not limited to these orders.
[0046] As an example, the machine tool involved in the present disclosure may also be configured not to have a common power supply circuit, and to perform DC conversion in each power confirmation object. In addition, the power meter may also be arranged on the downstream side of the power supply circuit. The machine tool involved in the present disclosure can have any number of power confirmation objects. In addition, the simple action mechanism may also be, for example, a belt conveyor, an air compressor, an electric heater, etc. In the machine tool involved in the present disclosure, the control device only needs to have a measurement control unit, and the calculation control unit, the power consumption storage unit, the threshold setting unit and the notification unit are of arbitrary structures. In addition, the control device may also be a computer device that can control the power confirmation object via a numerical control device.
[0047] Description of Reference Numerals
[0048] 1: machine tool; 10: power meter; 20: power supply circuit; 31-35: servo mechanism (power confirmation object); 36: cooling fan (simple action mechanism / power confirmation object); 37: cutting fluid pump (simple action mechanism / power confirmation object); 40: control device; 41: processing control unit; 42: measurement control unit; 43: calculation control unit; 44: power consumption storage unit; 45: notification unit; 46: threshold setting unit; 47: life estimation unit; A: amplifier; M: motor; S: AC power supply.
Claims
1. A machine tool having: Multiple power confirmation objects; a single power meter provided in a circuit for supplying power to all of the power confirmation objects; and a control device for controlling the plurality of power confirmation objects, in, The control device includes a measurement control unit configured to measure reference power consumption of each of the power check objects by operating the power check objects one by one and acquiring detection values of the power meters during the operation of the power check objects.
2. The machine tool according to claim 1, wherein: The measurement control unit operates the power check target at a predetermined timing.
3. The machine tool according to claim 1 or 2, wherein: The control device further includes a notification unit configured to externally notify, when the reference power consumption exceeds a power threshold value set for each of the power check targets, that the reference power consumption exceeds the power threshold value.
4. The machine tool according to claim 3, wherein: The control device further includes a threshold setting unit that sets the power threshold of the power confirmation target after replacement based on the reference power consumption immediately before replacement when the power confirmation target is replaced.
5. The machine tool according to any one of claims 1 to 4, wherein: The control device also has: a power consumption storage unit that stores the reference power consumption for each of the power confirmation objects; as well as A life estimating unit estimates the life of the power confirmation target based on the plurality of reference power consumptions.
6. The machine tool according to any one of claims 1 to 5, wherein: The plurality of power confirmation objects include a servo mechanism having a motor and an amplifier.
7. The machine tool according to any one of claims 1 to 6, wherein: The plurality of power confirmation objects include a simple action mechanism that is not subjected to feedback control, The control device further includes a calculation control unit that calculates the current power consumption of the simple action mechanism by subtracting the power consumption of the power confirmation objects other than the simple action mechanism from the detection value of the power meter during the operation period of the plurality of power confirmation objects including the simple action mechanism.