Precision diagnosis device and precision diagnosis method for machine tool, precision adjustment reservation system

Abstract

The present application provides a precision diagnosis device and precision diagnosis method for a machine tool, and a precision adjustment reservation system, which can predict and previously indicate the period when precision adjustment of the machine tool is required. The precision diagnosis device (1) has: a variation amount detection unit (2) that detects temperature (3) and inclination amount (4) of the machine tool as variation amount data (6); a variation amount recording unit (5) that records the variation amount data (6); a precision variation prediction unit (7) that predicts precision variation of the machine tool in the future using the variation amount data (6) recorded in the variation amount recording unit (5); and a precision adjustment timing indication unit (13) that indicates precision adjustment timing (14) of the machine tool according to the precision variation predicted by the precision variation prediction unit (7).

Description

Technical Field

[0001] This disclosure relates to a precision diagnostic device and a precision diagnostic method for pre-determining the appropriate timing for performing precision adjustments on a machine tool, and a system for scheduling the date and time for performing precision adjustments based on the timing determined by the precision diagnostic device. Background Technology

[0002] Machine tool accuracy can fluctuate over time due to various factors such as factory temperature changes, wear and tear on machine tool components, and ground deformation. To prevent a decrease in machining accuracy, the accuracy must be measured and adjusted periodically.

[0003] As a prior art for precision adjustment of machine tools, there is a method using a laser length measuring device. For example, a reflective target is mounted on a moving worktable, and a laser interferometric length measuring device is mounted on the spindle side. While the feed axis is being moved, the error at various positions is measured (see Patent Document 1). Based on the measurement results, a correction amount is determined to reduce the error at various positions. When using the machine tool, the axis position is corrected according to the determined correction amount, thereby performing precision adjustment of the machine tool. Furthermore, leveling is widely performed by setting a level on the machine tool's worktable and adjusting the height of the machine tool's base bolts to determine levelness.

[0004] In addition, as a technology for diagnosing the accuracy status of machine tools, there is also a technology that diagnoses whether the machine tool's accuracy has changed significantly based on temperature information (see Patent Document 2).

[0005] Existing technical documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2020-85704

[0007] Patent Document 2: Japanese Patent Application Publication No. 2019-136846 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] However, the method for measuring and adjusting the accuracy of machine tools, as described in Patent Document 1, is time-consuming, especially in large machine tools. Therefore, for measurements to be performed on machine tools used in production, the date and time of the measurement need to be planned in advance. Furthermore, due to the high cost and operational difficulties of measuring instruments, it is believed that in many cases, the machine tool user does not perform the accuracy adjustment themselves, but rather delegates the task to a designated person. In such cases, it is particularly necessary to plan when the accuracy adjustment will be performed and to schedule it in advance.

[0010] As a method for determining the timing of accuracy adjustments, the diagnostic technique of Patent Document 2 is considered, which adjusts the accuracy when a large change in accuracy is diagnosed. However, while the diagnostic technique of Patent Document 2 can diagnose the current accuracy state, it cannot predict the future periods when accuracy adjustments will be needed.

[0011] Therefore, the purpose of this disclosure is to provide a technique that can predict and provide advance notice of when a machine tool needs precision adjustments.

[0012] Furthermore, the purpose of this disclosure is to provide a system that can easily delegate precision adjustments based on forecasts for periods requiring precision adjustments.

[0013] Methods for solving problems

[0014] To achieve the above objectives, the first technical solution of this disclosure is a precision diagnostic device for machine tools, characterized in that it comprises:

[0015] The change detection unit detects the magnitude of changes in the state of the machine tool and / or its surrounding environment as the change quantity;

[0016] A change recording unit, which records the change;

[0017] A precision change prediction unit uses the change amount recorded in the change amount recording unit to predict future precision changes of the machine tool; and

[0018] The precision adjustment timing prompt unit prompts the machine tool for the timing of precision adjustment based on the precision change predicted by the precision change prediction unit.

[0019] Another aspect of this disclosure is characterized in that, in the above structure, the accuracy change prediction unit uses an accuracy change prediction formula to predict future accuracy changes of the machine tool, the accuracy change prediction formula being configured to include a change amount dependent component that varies according to the change amount and an elapsed time dependent component that varies according to elapsed time.

[0020] Another feature of this disclosure is that, in the above structure, the accuracy change prediction formula is expressed as a formula containing a periodic function.

[0021] Another aspect of this disclosure is characterized in that, in the above structure, the accuracy change prediction formula is expressed as a formula containing a function of how the magnitude of the predicted accuracy change increases with the passage of time.

[0022] Another feature of this disclosure is that, in the above structure, the precision diagnostic device for the machine tool further comprises:

[0023] The accuracy recording unit records the machine tool accuracy obtained from the actual measurement of the machine tool, along with the measurement date and time; and

[0024] The accuracy change prediction determination unit determines the accuracy change prediction formula based on the machine tool accuracy and the measurement date and time recorded in the accuracy recording unit, and the change amount recorded in the change amount recording unit.

[0025] The accuracy change prediction unit uses the accuracy change prediction formula determined by the accuracy change prediction formula determination unit to predict the future accuracy change of the machine tool.

[0026] Another aspect of this disclosure is characterized in that, in the above structure, the change is the temperature of the machine tool and / or the surrounding environment.

[0027] Another aspect of this disclosure is characterized in that, in the above structure, the amount of change is the tilting amount of the machine tool.

[0028] Another feature of this disclosure is that, in the above structure, a data communication unit is further included, which is capable of data communication with an information terminal connected via a communication line.

[0029] Another feature of this disclosure is that, in the above structure, the machine tool's precision diagnostic device further includes a precision adjustment desired date and time determination unit, which is capable of determining the desired precision adjustment date and time based on the precision adjustment timing prompted by the precision adjustment timing reminder unit.

[0030] The desired date and time for precision adjustment determined by the precision adjustment desired date and time determination unit can be sent to the information terminal via the data communication unit.

[0031] Another feature of this disclosure is that, in the above structure, the data communication unit is able to obtain the precision adjustment-enhanced date and time from the information terminal.

[0032] The precision diagnostic device for the machine tool also includes a precision adjustment implementation date and time determination unit. This precision adjustment implementation date and time determination unit determines the precision adjustment implementation date and time based on the precision adjustment timing prompted by the precision adjustment timing reminder unit and the obtained precision adjustment implementation date and time.

[0033] The precision adjustment implementation date and time determined by the precision adjustment implementation date and time determination unit can be sent to the information terminal via the data communication unit.

[0034] To achieve the above objectives, the second technical solution of this disclosure is a machine tool accuracy diagnosis method, characterized by performing the following steps:

[0035] The change detection step detects the magnitude of the change in the state of the machine tool and / or its surrounding environment as the change amount;

[0036] The change recording step involves recording the change.

[0037] The accuracy change prediction step uses the change amount recorded in the change amount recording step to predict future accuracy changes of the machine tool; and

[0038] The precision adjustment timing prompt step prompts the machine tool for the timing required for precision adjustment based on the precision change predicted in the precision change prediction step.

[0039] To achieve the above objectives, the third technical solution of this disclosure is a precision adjustment reservation system for machine tools, characterized by comprising:

[0040] The aforementioned precision diagnostic device;

[0041] Information terminals connected to communication lines; and

[0042] The precision adjustment reservation system server is connected to the precision diagnostic device and the information terminal via a communication line. Based on the precision adjustment timing prompted by the precision adjustment timing reminder unit of the precision diagnostic device and the precision adjustment implementation date and time obtained from the information terminal, it determines and reserves the precision adjustment implementation date and time.

[0043] Invention Effects

[0044] According to this disclosure, the magnitude of changes in the state of a machine tool or its surrounding environment is detected, and the future accuracy changes of the machine tool are predicted accordingly, indicating the period when accuracy adjustments are needed. Thus, the machine tool user can pre-plan an accuracy adjustment schedule to maintain the accuracy of the machine tool.

[0045] In particular, by setting up a server that connects machine tools and information terminals, it is possible to build a precision adjustment reservation system for machine tools that corresponds to the precision adjustments of multiple machine tools.

[0046] According to another aspect of this disclosure, in addition to the effects described above, by using a precision change prediction formula consisting of a change-dependent component that varies according to the amount of change and an elapsed-time dependent component that varies according to elapsed time, in addition to detectable factors, it is also possible to indicate the period in which precision adjustment is needed at an appropriate frequency in the case of precision changes based on undetectable factors.

[0047] According to another aspect of this disclosure, in addition to the effects described above, the accuracy change prediction formula is expressed as a formula containing a periodic function, thus, for example, it is possible to predict the accuracy change as a change with a period of 1 year, indicating the period when accuracy adjustment is needed.

[0048] According to another aspect of this disclosure, in addition to the effects described above, the accuracy change prediction formula is expressed as a function that includes the predicted accuracy change increasing as time goes on. Therefore, even in the case of accuracy changes based on undetectable factors, it is possible to indicate the period when accuracy adjustments are needed at an appropriate frequency.

[0049] According to another aspect of this disclosure, in addition to the effects described above, the measured machine tool accuracy, along with the change, date, and time, are recorded together, and an accuracy change prediction formula is determined based on these data, thereby improving the accuracy of accuracy change prediction.

[0050] According to another aspect of this disclosure, in addition to the effects described above, by detecting temperature as a change, it is possible to predict the change in accuracy caused by temperature changes.

[0051] According to another aspect of this disclosure, in addition to the effects described above, by detecting tilt as a change, it is possible to predict the change in accuracy caused by the change in tilt.

[0052] According to another aspect of this disclosure, in addition to the effects described above, a data communication unit is provided for data communication with an information terminal connected via a communication line, thereby enabling easy sharing of information with external parties.

[0053] According to another aspect of this disclosure, in addition to the effects described above, the desired date and time for precision adjustment are determined based on the suggested precision adjustment timing and transmitted via a communication line, thereby enabling the precision adjustment to be easily delegated to the implementer.

[0054] According to another aspect of this disclosure, in addition to the effects described above, the implementation date and time of the precision adjustment are determined based on the date and time that the precision adjustment can be implemented, obtained via the communication line, thereby reliably determining the date on which the precision adjustment can be implemented as the implementation date. Attached Figure Description

[0055] Figure 1 This is a structural diagram of a precision diagnostic device that determines and sends the desired date and time for precision adjustment.

[0056] Figure 2 This is a structural diagram of a precision diagnostic device that obtains the date and time when precision adjustments can be implemented, and determines and sends the implementation date and time of the precision adjustments.

[0057] Figure 3This is a structural diagram of the precision adjustment reservation system, which determines and sends the implementation date and time of precision adjustment in the precision adjustment reservation system server.

[0058] Figure 4 This diagram illustrates the method for determining the timing of precision adjustment.

[0059] Figure 5 This is an example of a screen displayed by the display unit.

[0060] Label Explanation

[0061] 1: Accuracy diagnostic device; 2: Change detection unit; 3: Temperature; 4: Tilt amount; 5: Change recording unit; 6: Change data; 7: Accuracy change prediction unit; 8: Accuracy change prediction formula; 9: Accuracy recording unit; 10: Machine tool accuracy; 11: Measurement date and time; 12: Accuracy change prediction formula determination unit; 13: Accuracy adjustment timing reminder unit; 14: Accuracy adjustment timing; 15A: Accuracy adjustment desired date and time determination unit; 15B, 15C: Accuracy adjustment implementation date and time determination unit; 16A: Accuracy adjustment desired date and time; 16B, 16C: Accuracy adjustment implementation date and time; 17: Data communication unit; 18: Information terminal for the accuracy adjustment implementer; 19: Accuracy adjustment implementable date and time (schedulable date); 20: Accuracy adjustment scheduling system server. Detailed Implementation

[0062] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0063] Figure 1 This is a diagram illustrating an example of the structure of the precision diagnostic device of this disclosure.

[0064] The precision diagnostic device 1 diagnoses changes in the precision of the machine tool using the precision diagnostic method described later, and indicates the timing for precision adjustment. The precision changes of the machine tool diagnosed in this disclosure can be any precision change index, such as the positioning accuracy, straightness, and squareness of each linear and rotary axis of the machine tool, the vibration of the spindle and rotary axes, the flatness of the worktable, and spatial errors. Alternatively, multiple indices can be used in combination, rather than a single index.

[0065] First, in the change detection unit 2, various sensors installed on the machine tool detect the magnitude of changes in the state of the machine tool or its surrounding environment as the change amount (change detection step). In this embodiment, as a change in state, temperature 3 is detected by a temperature sensor, and tilt amount 4 is detected by a tilt sensor.

[0066] Next, in the change recording unit 5, the detected change is recorded together with the time as change data 6 (change recording step).

[0067] Furthermore, in the accuracy change prediction unit 7, the accuracy change is predicted by a pre-set accuracy change prediction formula 8 (accuracy change prediction step). For example, the accuracy change prediction formula 8 is expressed as in the following formula 1.

[0068] [Mathematical Expression 1]

[0069] ΔX(t-t0)=f(θ(t)-θ0)+g(t-t0) (Formula 1)

[0070] t: The time point at which you want to predict changes in accuracy

[0071] t0: The reference time point for the accuracy change (the time point when the previous accuracy adjustment was performed).

[0072] △X: Precision variation

[0073] θ(t): The amount of change in the desired prediction accuracy at any given time point.

[0074] θ0: The amount of change at the reference time point for the accuracy change

[0075] f: a function representing the change in the component dependent on the change in θ.

[0076] g: a function representing the time-dependent component that changes over time t-t0.

[0077] Regarding Equation 1, the variable-dependent component based on the change in the variable θ is obtained using the function f, and the time-dependent component based on the change over time t-t0 is obtained using the function g. By adding them together, the precision change ΔX is obtained.

[0078] The change-dependent component predicts the accuracy change based on the change-data 6. On the other hand, the function g representing the time-dependent component is set to a function such that the predicted accuracy change increases as time passes. Therefore, even if an accuracy change occurs due to reasons other than the detected change, if a certain amount of time has elapsed, it is diagnosed as requiring accuracy adjustment, thus maintaining accuracy. However, it is also possible to calculate the accuracy change ΔX solely from the change-dependent component without using the time-dependent component.

[0079] In addition, in Equation 1, the amount of change in the time point at which the accuracy change is to be predicted is obtained using the time function θ(t).

[0080] For example, if we assume that the function θ(t) changes in a period of one year, it can be expressed as a periodic function as shown in Equation 2 below.

[0081] [Mathematical Expression 2]

[0082]

[0083] t: Time elapsed

[0084] T: Cycle (1 year)

[0085] A, B, C: constants

[0086] The function θ(t) can be expressed mathematically as in Equation 2, or it can be represented as a set of points that correspond to the numerical values ​​of dates and times with the changes in quantities. Furthermore, the period can be other than a year, such as a week. The function θ(t) is predetermined based on fitting data of past changes.

[0087] Furthermore, as a method to improve the prediction accuracy of the accuracy change prediction formula 8, a method of learning using information on actual machine tool accuracy changes is considered. For this purpose, the measured machine tool accuracy 10, as well as the measurement date and time 11, are recorded in the accuracy recording unit 9. Using the measured machine tool accuracy 10, the measurement date and time 11, and the change data 6 at the time of measurement, the accuracy change prediction formula determination unit 12 determines the accuracy change prediction formula 8. For example, the least squares method is used to determine the functions f and g in a way that minimizes the value of the following formula 3.

[0088] However, it is also possible to use known parameter identification methods or machine learning methods instead of the least squares method in Equation 3 to determine the accuracy change prediction in Equation 8.

[0089] [Mathematical Expression 3]

[0090]

[0091] t0, t1, ..., t N The accuracy of the measured date and time was recorded.

[0092] θ0, θ1, ..., θ N The amount of change in date and time with precision was measured.

[0093] △X n、n-1 : The measured t n-1 to t n Precision variation between

[0094] Next, in the accuracy adjustment timing prompt unit 13, based on the accuracy change predicted by the accuracy change prediction unit 7, the period when accuracy adjustment is needed is predicted, the accuracy adjustment timing 14 is determined, and a prompt is given (accuracy adjustment timing prompt step). For example, as Figure 4 As shown, the accuracy change ΔX(t-t0) was predicted. At this point, the time point where the absolute value of the accuracy change ΔX(t-t0) from the reference time point t0 exceeds the allowable value ±ΔXmax indicates a deviation from the target value. Figure 4The time point in the slanted area is used as the precision adjustment timing t M A prompt will be given. The prompt for precision adjustment timing 14 is given by displaying it on a display unit (not shown) or by forwarding information via email, etc. The allowable value ±ΔXmax can also be set by the machine tool user from the display unit screen, etc. In addition, precision adjustment timing 14 may not be a single point in time, but is expressed as a period of time.

[0095] Finally, in the precision adjustment desired date and time determination unit 15A, the precision adjustment desired date and time 16A is determined based on the precision adjustment timing 14. The method for determining the precision adjustment desired date and time 16A can be either an algorithm that automatically determines a date close to the date of the precision adjustment timing 14, or the precision adjustment timing 14 can be displayed on the display screen, allowing the user of the precision diagnostic device 1 to use it as a reference for inputting a convenient date. After determining the precision adjustment desired date and time 16A, it is transmitted to an external information terminal via the data communication unit 17. Figure 1 In this process, an information terminal (hereinafter referred to as "information terminal") is sent to the precision adjustment implementer. This allows for easy communication regarding the desired date and time for precision adjustment. Alternatively, the external information terminal can be used as a server, with the precision adjustment implementer confirming the information sent to the server.

[0096] The accuracy diagnostic device 1 described above includes: a change detection unit 2, which detects the temperature 3 and tilt amount 4 (the magnitude of the change in state) of the machine tool as change data 6 (change amount); a change recording unit 5, which records the change data 6; an accuracy change prediction unit 7, which uses the change data 6 recorded in the change recording unit 5 to predict future accuracy changes of the machine tool; and an accuracy adjustment timing prompt unit 13, which prompts the machine tool for accuracy adjustment timing 14 (timing when accuracy adjustment is required) based on the accuracy change predicted by the accuracy change prediction unit 7. The accuracy diagnostic device 1 described above executes an accuracy diagnostic method based on the above steps.

[0097] In this way, by detecting the magnitude of changes in the machine tool's condition, future changes in the machine tool's accuracy can be predicted, indicating when accuracy adjustments are needed. As a result, machine tool users can plan in advance for accuracy adjustments to maintain the machine tool's accuracy.

[0098] In particular, the accuracy change prediction unit 7 uses an accuracy change prediction formula 8 to predict future accuracy changes in the machine tool. The accuracy change prediction formula 8 is configured to include a change amount dependent component that changes based on the change amount data 6 and an elapsed time dependent component that changes based on elapsed time. Therefore, not only for detectable factors, but also in the case of accuracy changes based on undetectable factors, it is possible to indicate the period when accuracy adjustment is needed at an appropriate frequency.

[0099] Formula 8, which predicts changes in accuracy, is expressed as a formula containing a periodic function. Therefore, it can, for example, predict changes in accuracy as occurring over a one-year period, indicating the time when accuracy adjustments are needed.

[0100] Equation 8, which predicts the change in accuracy, is expressed as a function g (Equation 1) that includes the magnitude of the predicted change in accuracy increasing with time. Therefore, even in cases where the change in accuracy occurs due to undetectable factors, it is possible to indicate the period when accuracy adjustments are needed with an appropriate frequency.

[0101] It also includes: an accuracy recording unit 9, which records the machine tool accuracy 10 obtained from the actual measurement of the machine tool accuracy together with the measurement date and time 11; and an accuracy change prediction determination unit 12, which determines an accuracy change prediction formula 8 based on the machine tool accuracy 10 recorded in the accuracy recording unit 9, the measurement date and time 11, and the change amount data 6 recorded in the change amount recording unit 5, and the accuracy change prediction unit 7 uses the accuracy change prediction formula 8 determined by the accuracy change prediction determination unit 12 to predict future machine tool accuracy changes.

[0102] Therefore, the measured machine tool accuracy 10 is recorded together with the change data 6, measurement date and time 11, and the accuracy change prediction formula 8 is determined based on these data, thereby improving the prediction accuracy of accuracy change.

[0103] The change data 6 is the machine tool temperature 3. Therefore, it is possible to predict the change in accuracy caused by temperature changes.

[0104] The change data 6 is the machine tool tilt amount 4. Therefore, it is possible to predict the accuracy change caused by the tilt change.

[0105] It also has a data communication unit 17 that can communicate with an information terminal 18 connected via a communication line. Therefore, it is easy to share information with the outside world.

[0106] It also includes a precision adjustment desired date and time determination unit 15A, which is capable of determining the desired date and time 16A of precision adjustment based on the precision adjustment timing 14 prompted by the precision adjustment timing prompt unit 13. The desired date and time 16A of precision adjustment determined by the precision adjustment desired date and time determination unit 15A can be sent to the information terminal 18 via the data communication unit 17.

[0107] Therefore, it is possible to easily delegate the precision adjustment to the implementer.

[0108] The following describes some modifications to this disclosure.

[0109] As another example of communication with the outside world, it is shown Figure 2 . Figure 2This is a structural diagram showing the process of obtaining the date and time when precision adjustment can be implemented from an external source, determining the implementation date and time of precision adjustment based on the precision adjustment timing 14 and the date and time when precision adjustment can be implemented, and then sending the result.

[0110] Numbers 1 to 14 are related to Figure 1 The same structure determines the precision adjustment timing 14. Figure 2 In, with Figure 1 The difference is that the precision adjustment implementation date and time 19 are obtained from the information terminal 18 via the data communication unit 17. In the precision adjustment implementation date and time determination unit 15B, the precision adjustment implementation date and time 16B are determined based on the precision adjustment timing 14 and the precision adjustment implementation date and time 19. Regarding the method for determining the precision adjustment implementation date and time 16B, an algorithm can automatically determine a date close to the precision adjustment timing 14 from the precision adjustment implementation date and time 19, or... Figure 5 The display shown shows the precision adjustment timing and the date and time on which the precision adjustment can be performed. The user of the precision diagnostic device 1 uses this as a reference to input a convenient date. (Regarding...) Figure 5 The displayed content will be explained later. After determining the date and time for the accuracy adjustment implementation 16B, it is sent to the information terminal 18 via the data communication unit 17. This confirms the appointment for the accuracy adjustment implementation.

[0111] In this way, the data communication unit 17 can obtain the precision adjustment implementation date and time 19 from the information terminal 18, and also has a precision adjustment implementation date and time determination unit 15B. The precision adjustment implementation date and time determination unit 15B determines the precision adjustment implementation date and time 16B based on the precision adjustment timing 14 prompted by the precision adjustment timing prompt unit 13 and the obtained precision adjustment implementation date and time 19. The precision adjustment implementation date and time 16B determined by the precision adjustment implementation date and time determination unit 15B can be sent to the information terminal 18 through the data communication unit 17.

[0112] Therefore, the date on which precision adjustments can be implemented can be reliably determined as the implementation date.

[0113] As another example of communication with the outside world, it is shown Figure 3 . Figure 3 This is a structural diagram of the precision adjustment reservation system, where the precision adjustment reservation system server (hereinafter referred to as "server") 20 determines and sends the precision adjustment implementation date and time.

[0114] Numbers 1 to 14 are related to Figure 1 and Figure 2Using the same structure, the precision adjustment timing 14 is determined. Precision adjustment timing 14 is sent as data via data communication unit 17 to the precision adjustment implementation date and time determination unit 15C located on server 20. Similarly, data on the precision adjustment implementable date and time 19 is sent from information terminal 18 to precision adjustment implementation date and time determination unit 15C. In precision adjustment implementation date and time determination unit 15C, the precision adjustment implementation date and time 16C is determined based on this information. Regarding the method for determining the precision adjustment implementation date and time 16C, an algorithm can be used to automatically determine a date close to the precision adjustment timing 14 from the precision adjustment implementable date and time 19, or... Figure 5 The screen shown displays the precision adjustment timing and the date and time on which the precision adjustment can be performed, which the user of the precision diagnostic device 1 can use as a reference to input a convenient date.

[0115] Next, server 20 sends the determined precision adjustment implementation date and time 16C to precision diagnostic device 1 and information terminal 18, respectively. This confirms the appointment for precision adjustment implementation. At this time, the precision adjustment date and time can be notified directly via email, or the user of the machine tool's precision diagnostic device 1 and the precision adjustment implementer can each have an account and confirm the precision adjustment date and time on the screen displayed after logging into server 20.

[0116] Thus, the aforementioned precision adjustment reservation system comprises: a precision diagnostic device 1; an information terminal 18 connected to a communication line; and a server 20 connected to the precision diagnostic device 1 and the information terminal 18 via the communication line, which determines and reserves the precision adjustment implementation date and time 16C based on the precision adjustment timing 14 indicated by the precision adjustment timing reminder unit 13 of the precision diagnostic device 1 and the precision adjustment implementation date and time 19 obtained from the information terminal 18.

[0117] Therefore, it is possible to construct a precision adjustment reservation system for machine tools that can correspond to the precision adjustments of multiple machine tools.

[0118] Next, in Figure 5The following is an example of the screens displayed by the precision adjustment implementation date and time determination units 15B and 15C. The precision adjustment reservation screen 101 displays the date 102 requiring precision adjustment, the precision adjustment implementation date 103, a calendar 104 displaying the date, and a reservation button 105. First, the date 102 requiring precision adjustment is displayed according to the precision adjustment timing 14, and the period requiring precision adjustment is indicated by a diagonal line in the calendar 104. In the calendar 104, the reservable date, i.e., the precision adjustment implementation date and time 19, is indicated by a circle. The user of the precision diagnostic device 1 can select the precision adjustment implementation date 103 by considering the reservable date 19 and the date 102 requiring precision adjustment. In this example, the anticipated date requiring precision adjustment is January 19, and January 14, a date before that, is selected as the reservable date and the precision adjustment implementation date. After determining the precision adjustment implementation date 103, pressing the reservation button 105 sends a message to the information terminal 18 and the server 20 to reserve the precision adjustment.

[0119] Furthermore, in the examples above, the machine tool's temperature is detected and recorded as change data, but the temperature of the machine tool's surrounding environment can also be used as change data. Alternatively, the temperatures of both the machine tool and its surrounding environment can be used as change data.

[0120] Alternatively, the accuracy recording unit can be omitted, and the accuracy change prediction unit can predict the accuracy change based solely on the change amount data.

[0121] Alternatively, the precision adjustment implementation date and time determination unit and the data communication unit can be omitted, and the desired precision adjustment date and time, and the precision adjustment implementation date and time can be displayed only on the display unit provided on the precision diagnostic device.

[0122] The precision diagnostic device can be formed by the machine tool's digital control unit or by an external device that can communicate with the digital control unit.

Claims

1. A precision diagnostic device for machine tools, characterized in that, have: The change detection unit detects the magnitude of changes in the state of the machine tool and / or its surrounding environment as the change quantity; A change recording unit that records the change; A precision change prediction unit uses the change amount recorded in the change amount recording unit to predict future precision changes of the machine tool; and The precision adjustment timing reminder unit, based on the precision change predicted by the precision change prediction unit, indicates when the machine tool needs precision adjustment. The accuracy change prediction unit uses an accuracy change prediction formula to predict future accuracy changes of the machine tool. The accuracy change prediction formula is configured to include a change amount dependent component that varies according to the amount of change and an elapsed time dependent component that varies according to the elapsed time. The precision diagnostic device for the machine tool also has: The accuracy recording unit records the machine tool accuracy obtained from the actual measurement of the machine tool, along with the measurement date and time; and The accuracy change prediction determination unit determines the accuracy change prediction formula based on the machine tool accuracy and the measurement date and time recorded in the accuracy recording unit, and the change amount recorded in the change amount recording unit. The accuracy change prediction unit uses the accuracy change prediction formula determined by the accuracy change prediction formula determination unit to predict the future accuracy change of the machine tool.

2. The machine tool precision diagnostic device according to claim 1, characterized in that, The accuracy change prediction formula is expressed as a formula containing a periodic function.

3. The machine tool precision diagnostic device according to claim 1, characterized in that, The accuracy change prediction formula is expressed as a function that includes the magnitude of the predicted accuracy change increasing with the passage of time.

4. The machine tool precision diagnostic device according to any one of claims 1 to 3, characterized in that, The change is the temperature of the machine tool and / or the surrounding environment.

5. The machine tool precision diagnostic device according to any one of claims 1 to 3, characterized in that, The change is the tilt of the machine tool.

6. The machine tool precision diagnostic device according to any one of claims 1 to 3, characterized in that, The precision diagnostic device for the machine tool also includes a data communication unit, which is capable of communicating with an information terminal connected via a communication line.

7. The machine tool precision diagnostic device according to claim 6, characterized in that, The machine tool's precision diagnostic device also includes a precision adjustment desired date and time determination unit, which determines the desired precision adjustment date and time based on the precision adjustment timing prompted by the precision adjustment timing reminder unit. The desired date and time for precision adjustment determined by the precision adjustment desired date and time determination unit can be sent to the information terminal via the data communication unit.

8. The machine tool precision diagnostic device according to claim 6, characterized in that, The data communication unit is able to obtain the date and time when the precision adjustment can be implemented from the information terminal. The precision diagnostic device for the machine tool also includes a precision adjustment implementation date and time determination unit, which determines the precision adjustment implementation date and time based on the precision adjustment timing prompted by the precision adjustment timing reminder unit and the obtained precision adjustment implementation date and time. The precision adjustment implementation date and time determined by the precision adjustment implementation date and time determination unit can be sent to the information terminal via the data communication unit.

9. A method for diagnosing the accuracy of a machine tool, characterized in that, Perform the following steps: The change detection step detects the magnitude of the change in the state of the machine tool and / or its surrounding environment as the change amount; The change recording step involves recording the change. The accuracy recording step involves recording the machine tool accuracy obtained from the actual measurement of the machine tool along with the measurement date and time; The accuracy change prediction formula determination step determines the accuracy change prediction formula based on the machine tool accuracy and the measurement date and time recorded in the accuracy recording step, and the change amount recorded in the change amount recording step. The accuracy change prediction formula is configured to include a change amount dependent component that changes according to the change amount and an elapsed time dependent component that changes according to elapsed time. The accuracy change prediction step uses the change amount recorded in the change amount recording step and the accuracy change prediction formula determined in the accuracy change prediction formula determination step to predict future accuracy changes of the machine tool; and The precision adjustment timing prompt step prompts the machine tool for the timing required for precision adjustment based on the precision change predicted in the precision change prediction step.

10. A precision adjustment reservation system for a machine tool, characterized in that, have: The precision diagnostic device for machine tools as described in claim 6; Information terminals connected to communication lines; and The precision adjustment reservation system server is connected to the precision diagnostic device and the information terminal via a communication line. Based on the precision adjustment timing prompted by the precision adjustment timing reminder unit of the precision diagnostic device and the precision adjustment implementation date and time obtained from the information terminal, it determines and reserves the precision adjustment implementation date and time.

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