A vibration data acquisition method and system for a main shaft of a numerical control machine tool

Abstract

The application discloses a vibration data acquisition method and system of a main shaft of a numerical control machine tool, which is used for acquiring a main shaft vibration response value under the influence of a feed shaft, so as to analyze the vibration condition of the main shaft. The method comprises the following steps: acquiring cross power spectral densities of the main shaft and the feed shaft when the main shaft and the feed shaft vibrate and a power spectral density of the feed shaft when the feed shaft vibrates; calculating a coupling coefficient between the main shaft and the feed shaft; acquiring an amplitude of the vibration of the main shaft itself, an angular frequency of the vibration of the main shaft itself, a phase of the vibration of the main shaft itself, a vibration intensity of the main shaft vibration and an amplitude of a second harmonic of the main shaft vibration; and combining the coupling coefficient between the main shaft and the feed shaft and the power spectral density of the feed shaft when the feed shaft vibrates, the main shaft vibration response value is calculated, so that the vibration condition analysis of the main shaft is completed.

Description

Technical Field

[0001] This invention belongs to the field of vibration analysis technology for CNC machine tools, and more specifically, relates to a method and system for acquiring vibration data of CNC machine tool spindles. Background Technology

[0002] Vibration data acquisition for CNC machine tool spindles is crucial for evaluating spindle stability and performance. Vibration data provides information about spindle motion, helping to detect potential problems and enable preventative maintenance. The following are general vibration data acquisition procedures:

[0003] Choosing a vibration sensor: Select an appropriate vibration sensor, which could be an accelerometer, velocity sensor, or displacement sensor. Accelerometers are the most commonly used type because they provide detailed information about the vibration. To obtain raw vibration data, this method employs a piezoelectric sensor, which generates an analog voltage signal in response to dynamic compressive and tensile forces during vibration; the industry standard used is IEPE (Industrial Integrated Circuit).

[0004] Sensor Installation: Install the vibration sensor near the CNC machine tool spindle. Ensure the sensor is in close contact with the spindle surface to obtain accurate vibration data. The selection of the installation location may require consultation with the CNC machine tool manufacturer.

[0005] Sampling frequency: This determines the frequency at which vibration data is sampled. Generally, a higher sampling frequency provides more detailed vibration information. However, data processing and storage requirements also need to be considered.

[0006] Under perfectly ideal conditions, machining produces no vibration; all the power and torque of the equipment are used to complete the machining process. However, in practice, vibration occurs through the normal transmission mechanism of cyclic forces. The components of the machine tool interact, and some power and torque are consumed as structural vibration. A good structure has a low vibration level; however, part deformation, slight changes in dynamic characteristics, shaft misalignment, bearing wear, and rotor imbalance all increase the amount of vibration in the structure. All these factors lead to an increase in vibration energy, which is dissipated through the machine tool, excites resonance, and adds a considerable dynamic load to the bearings, ultimately resulting in suboptimal machining. Vibration can cause machine tool wear and failure. As long as the excitation force is constant or kept within certain limits, the measured vibration level is also constant or varies within the same limits.

[0007] In addition, most machine tools in good condition exhibit typical vibration levels and spectral characteristics. This spectrum, known as the machine tool's vibration characteristics, is obtained by analyzing frequency signals. When defects begin to appear, the dynamic process of machining is altered, and some driving forces are modified, leading to changes in vibration levels, which manifest as an increase in the height of some bars in the spectrum. Vibration signals contain a wealth of information related to the machine tool's operating conditions; therefore, regular vibration measurements are necessary as an indicator of machine tool health and to ensure timely maintenance.

[0008] However, there is no existing technology that can take into account the impact of the feed axis on the spindle, thereby completing the data analysis. Summary of the Invention

[0009] To address the above technical problems, this invention proposes a method for acquiring vibration data of a CNC machine tool spindle. This method is used to obtain the spindle vibration response value under the influence of the feed axis, thereby analyzing the spindle's vibration condition. The method includes:

[0010] Obtain the cross power spectral density and the power spectral density of the feed axis vibration when the spindle and feed axis vibrate, and calculate the coupling coefficient between the spindle and feed axis.

[0011] The amplitude, angular frequency, phase, intensity, and second harmonic amplitude of the spindle's own vibration are obtained. Combined with the coupling coefficient between the spindle and the feed axis and the power spectral density of the feed axis during vibration, the spindle vibration response value is calculated, thereby completing the analysis of the spindle's vibration condition.

[0012] Furthermore, calculating the spindle vibration response value includes:

[0013] V m (t)=A m ·sin(ω m ·t+φ m )+B mf ·P f +C m ·sin 2 (ω m ·t+φ m )+D m ·cos(2ω m ·t)

[0014] Among them, V m (t) represents the spindle vibration response value at time t, A m The amplitude of the main shaft's own vibration, ω m The angular frequency of the main shaft's own vibration, φ m The phase of the main shaft's own vibration, B mf The coupling coefficient between the main spindle and the feed axis, P fC is the power spectral density during feed shaft vibration. m The vibration intensity of the main shaft vibration, D m The amplitude of the second harmonic of the main shaft vibration.

[0015] Furthermore, the coupling coefficient B between the spindle and the feed axis mf include:

[0016]

[0017] Among them, P mf The cross power spectral density, Q, during the vibration of the main spindle and feed shaft mf R represents the high-frequency coupling effect value, used to simulate the high-frequency nonlinear coupling during spindle and feed axis vibration. f This is the low-frequency coupling effect value, used to represent the excitation effect of the feed shaft vibration on the spindle at low frequencies.

[0018] Furthermore, the high-frequency coupling effect value Q mf include:

[0019] Q mf =K q ·sin(2ω m )

[0020] Among them, K q This is the high-frequency amplitude coefficient of the spindle under the influence of feed shaft vibration.

[0021] Furthermore, the low-frequency coupling effect value R f include:

[0022]

[0023] Among them, K r The low-frequency amplitude coefficient of the feed shaft under the influence of spindle vibration, ω r The low-frequency angular frequency of the feed axis is defined as the angular frequency of the feed axis when it is below a preset threshold.

[0024] This invention also proposes a vibration data acquisition system for a CNC machine tool spindle, used to acquire the spindle vibration response value under the influence of the feed axis, thereby analyzing the vibration condition of the spindle, including:

[0025] The coupling coefficient calculation module is used to obtain the cross power spectral density and the power spectral density of the feed axis vibration when the spindle and feed axis vibrate, and to calculate the coupling coefficient between the spindle and feed axis.

[0026] The response value calculation module is used to obtain the amplitude, angular frequency, phase, intensity, and second harmonic amplitude of the spindle's own vibration. Combined with the coupling coefficient between the spindle and the feed axis and the power spectral density of the feed axis during vibration, the module calculates the spindle vibration response value, thereby completing the vibration analysis of the spindle.

[0027] Furthermore, calculating the spindle vibration response value includes:

[0028] V m (t)=A m ·sin(ω m ·t+φ m )+B mf ·P f +C m ·sin 2 (ω m ·t+φ m )+D m ·cos(2ω m ·t)

[0029] Among them, V m (t) represents the spindle vibration response value at time t, A m The amplitude of the main shaft's own vibration, ω m The angular frequency of the main shaft's own vibration, φ m The phase of the main shaft's own vibration, B mf The coupling coefficient between the main spindle and the feed axis, P f C is the power spectral density during feed shaft vibration. m The vibration intensity of the main shaft vibration, D m The amplitude of the second harmonic of the main shaft vibration.

[0030] Furthermore, the coupling coefficient B between the spindle and the feed axis mf include:

[0031]

[0032] Among them, P mf The cross power spectral density, Q, during the vibration of the main spindle and feed shaft mf R represents the high-frequency coupling effect value, used to simulate the high-frequency nonlinear coupling during spindle and feed axis vibration. f This is the low-frequency coupling effect value, used to represent the excitation effect of the feed shaft vibration on the spindle at low frequencies.

[0033] Furthermore, the high-frequency coupling effect value Q mf include:

[0034] Q mf =Kq ·sin(2ω m )

[0035] Among them, K q This is the high-frequency amplitude coefficient of the spindle under the influence of feed shaft vibration.

[0036] Furthermore, the low-frequency coupling effect value R f include:

[0037]

[0038] Among them, K r The low-frequency amplitude coefficient of the feed shaft under the influence of spindle vibration, ω r The low-frequency angular frequency of the feed axis is defined as the angular frequency of the feed axis when it is below a preset threshold.

[0039] Compared with the prior art, the above-described technical solutions conceived in this invention have the following beneficial effects:

[0040] This invention obtains the cross power spectral density of the spindle and feed axis vibrations, and the power spectral density of the feed axis vibration, and calculates the coupling coefficient between the spindle and feed axis. It also obtains the amplitude, angular frequency, phase, intensity, and amplitude of the second harmonic of the spindle's own vibration, and combines these with the coupling coefficient and power spectral density of the feed axis vibration to calculate the spindle vibration response value, thereby completing the spindle vibration analysis. Through the above technical solution, this invention can calculate the spindle vibration response value based on the coupling between the spindle and feed axis vibrations, thus completing the vibration analysis of the spindle. Attached Figure Description

[0041] Figure 1 This is a flowchart of the method in Embodiment 1 of the present invention;

[0042] Figure 2 This is a system structure diagram of Embodiment 2 of the present invention;

[0043] Figure 3 This is the mounting layout of the spindle vibration sensor of the present invention;

[0044] Figure 4 This is the vibration raw data acquisition table of the present invention;

[0045] Figure 5 This is a diagram of the original vibration data of the present invention;

[0046] Figure 6 This is the root mean square value diagram of the spindle vibration of the present invention. Detailed Implementation

[0047] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0048] The method provided by this invention can be implemented in a terminal environment that may include one or more of the following components: a processor, a storage medium, and a display screen. The storage medium stores at least one instruction, which is loaded and executed by the processor to implement the method described in the following embodiments.

[0049] A processor may include one or more processing cores. The processor uses various interfaces and lines to connect various parts of the terminal, and performs various functions and processes data by running or executing instructions, programs, code sets or instruction sets stored in the storage medium, and by calling data stored in the storage medium.

[0050] Storage media can include random access memory (RAM) or read-only memory (ROM). Storage media can be used to store instructions, programs, code, code sets, or instructions.

[0051] The display screen is used to show the user interface of each application.

[0052] In the formula of this invention, all subscripts are only used to distinguish parameters and have no actual meaning.

[0053] In addition, those skilled in the art will understand that the structure of the terminal described above does not constitute a limitation on the terminal. The terminal may include more or fewer components, or combine certain components, or have different component arrangements. For example, the terminal may also include radio frequency circuits, input units, sensors, audio circuits, power supplies, and other components, which will not be described in detail here.

[0054] Example 1

[0055] like Figure 1 As shown in the figure, this invention proposes a method for acquiring vibration data of a CNC machine tool spindle, used to obtain the spindle vibration response value under the influence of the feed axis, thereby analyzing the vibration condition of the spindle, including:

[0056] Step 101, as follows Figure 3 As shown, relevant data is acquired through vibration sensors, such as... Figure 4-6 As shown, the cross power spectral density of the spindle and feed axis vibration and the power spectral density of the feed axis vibration are obtained, and the coupling coefficient between the spindle and feed axis is calculated.

[0057] Specifically, the coupling coefficient B between the spindle and the feed axis mf include:

[0058]

[0059] Among them, P mf The cross power spectral density, Q, during the vibration of the main spindle and feed shaft mf R represents the high-frequency coupling effect value, used to simulate the high-frequency nonlinear coupling during spindle and feed axis vibration. f This is the low-frequency coupling effect value, used to represent the excitation effect of the feed shaft vibration on the spindle at low frequencies.

[0060] Specifically, the high-frequency coupling effect value Q mf include:

[0061] Q mf =K q ·sin(2ω m )

[0062] Among them, K q This is the high-frequency amplitude coefficient of the spindle under the influence of feed shaft vibration.

[0063] Specifically, the low-frequency coupling effect value R f include:

[0064]

[0065] Among them, K r The low-frequency amplitude coefficient of the feed shaft under the influence of spindle vibration, ω r The low-frequency angular frequency of the feed axis is defined as the angular frequency of the feed axis when it is below a preset threshold.

[0066] Step 102: Obtain the amplitude, angular frequency, phase, intensity, and second harmonic amplitude of the spindle's own vibration. Combine this with the coupling coefficient between the spindle and the feed axis and the power spectral density of the feed axis during vibration to calculate the spindle vibration response value, thereby completing the spindle vibration analysis.

[0067] Specifically, calculating the spindle vibration response value includes:

[0068] V m (t)=A m ·sin(ω m ·t+φ m )+B mf ·P f +C m ·sin 2 (ω m ·t+φ m )+D m ·cos(2ω m ·t)

[0069] Among them, V m (t) is the main shaft vibration response value, A m The amplitude of the main shaft's own vibration, ω m The angular frequency of the main shaft's own vibration, φ m The phase of the main shaft's own vibration, B mf The coupling coefficient between the main spindle and the feed axis, P f C is the power spectral density during feed shaft vibration. m The vibration intensity of the main shaft vibration, D m The amplitude of the second harmonic of the main shaft vibration.

[0070] Example 2

[0071] like Figure 2 As shown in the figure, this embodiment of the invention also proposes a vibration data acquisition system for a CNC machine tool spindle, used to acquire the spindle vibration response value under the influence of the feed axis, thereby analyzing the vibration condition of the spindle, including:

[0072] The coupling coefficient calculation module is used to obtain the cross power spectral density and the power spectral density of the feed axis vibration when the spindle and feed axis vibrate, and to calculate the coupling coefficient between the spindle and feed axis.

[0073] Specifically, the coupling coefficient B between the spindle and the feed axis mf include:

[0074]

[0075] Among them, P mf The cross power spectral density, Q, during the vibration of the main spindle and feed shaft mf R represents the high-frequency coupling effect value, used to simulate the high-frequency nonlinear coupling during spindle and feed axis vibration. f This is the low-frequency coupling effect value, used to represent the excitation effect of the feed shaft vibration on the spindle at low frequencies.

[0076] Specifically, the high-frequency coupling effect value Q mf include:

[0077] Q mf =K q ·sin(2ω m )

[0078] Among them, K q This is the high-frequency amplitude coefficient of the spindle under the influence of feed shaft vibration.

[0079] Specifically, the low-frequency coupling effect value R f include:

[0080]

[0081] Among them, K r The low-frequency amplitude coefficient of the feed shaft under the influence of spindle vibration, ω r The low-frequency angular frequency of the feed axis is defined as the angular frequency of the feed axis when it is below a preset threshold.

[0082] The response value calculation module is used to obtain the amplitude, angular frequency, phase, intensity, and second harmonic amplitude of the spindle's own vibration. Combined with the coupling coefficient between the spindle and the feed axis and the power spectral density of the feed axis during vibration, the module calculates the spindle vibration response value, thereby completing the vibration analysis of the spindle.

[0083] Specifically, calculating the spindle vibration response value includes:

[0084] V m (t)=A m ·sin(ω m ·t+φ m )+B mf ·P f +C m ·sin 2 (ω m ·t+φ m )+D m ·cos(2ω m ·t)

[0085] Among them, V m (t) is the main shaft vibration response value, A m The amplitude of the main shaft's own vibration, ω m The angular frequency of the main shaft's own vibration, φ m The phase of the main shaft's own vibration, B mf The coupling coefficient between the main spindle and the feed axis, P f C is the power spectral density during feed shaft vibration. m The vibration intensity of the main shaft vibration, D m The amplitude of the second harmonic of the main shaft vibration.

[0086] Example 3

[0087] This invention also proposes a storage medium storing multiple instructions for implementing the aforementioned method for acquiring vibration data of a CNC machine tool spindle.

[0088] Optionally, in this embodiment, the storage medium may be located in any computer terminal in a group of computer terminals in a computer network, or in any mobile terminal in a group of mobile terminals.

[0089] Optionally, in this embodiment, the storage medium is configured to store program code for performing the following steps: Step 101, obtain the cross power spectral density and the power spectral density of the spindle and feed axis vibration, and calculate the coupling coefficient between the spindle and feed axis.

[0090] Specifically, the coupling coefficient B between the spindle and the feed axis mf include:

[0091]

[0092] Among them, P mf The cross power spectral density, Q, during the vibration of the main spindle and feed shaft mf R represents the high-frequency coupling effect value, used to simulate the high-frequency nonlinear coupling during spindle and feed axis vibration. f This is the low-frequency coupling effect value, used to represent the excitation effect of the feed shaft vibration on the spindle at low frequencies.

[0093] Specifically, the high-frequency coupling effect value Q mf include:

[0094] Q mf =K q ·sin(2ω m )

[0095] Among them, K q This is the high-frequency amplitude coefficient of the spindle under the influence of feed shaft vibration.

[0096] Specifically, the low-frequency coupling effect value R f include:

[0097]

[0098] Among them, K r The low-frequency amplitude coefficient of the feed shaft under the influence of spindle vibration, ω r The low-frequency angular frequency of the feed axis is defined as the angular frequency of the feed axis when it is below a preset threshold.

[0099] Step 102: Obtain the amplitude, angular frequency, phase, intensity, and second harmonic amplitude of the spindle's own vibration. Combine this with the coupling coefficient between the spindle and the feed axis and the power spectral density of the feed axis during vibration to calculate the spindle vibration response value, thereby completing the spindle vibration analysis.

[0100] Specifically, calculating the spindle vibration response value includes:

[0101] V m (t)=Am ·sin(ω m ·t+φ m )+B mf ·P f +C m ·sin 2 (ω m ·t+φ m )+D m ·cos(2ω m ·t)

[0102] Among them, V m (t) is the main shaft vibration response value, A m The amplitude of the main shaft's own vibration, ω m The angular frequency of the main shaft's own vibration, φ m The phase of the main shaft's own vibration, B mf The coupling coefficient between the main spindle and the feed axis, P f C is the power spectral density during feed shaft vibration. m The vibration intensity of the main shaft vibration, D m The amplitude of the second harmonic of the main shaft vibration.

[0103] Example 4

[0104] This invention also proposes an electronic device, including a processor and a storage medium connected to the processor. The storage medium stores multiple instructions, which can be loaded and executed by the processor to enable the processor to perform a vibration data acquisition method for a CNC machine tool spindle.

[0105] Specifically, the electronic device in this embodiment can be a computer terminal, which may include one or more processors and a storage medium.

[0106] The storage medium can be used to store software programs and modules, such as the vibration data acquisition method for a CNC machine tool spindle in this embodiment of the invention. The corresponding program instructions / modules are executed by the processor through running the software programs and modules stored in the storage medium, thereby performing various functional applications and data processing, thus realizing the aforementioned vibration data acquisition method for a CNC machine tool spindle. The storage medium may include high-speed random access storage media, and may also include non-volatile storage media, such as one or more magnetic storage systems, flash memory, or other non-volatile solid-state storage media. In some instances, the storage medium may further include storage media remotely configured relative to the processor, which can be connected to a terminal via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0107] The processor can call the information and application stored in the storage medium through the transmission system to perform the following steps: Step 101, obtain the cross power spectral density and the power spectral density of the spindle and feed axis vibration, and calculate the coupling coefficient between the spindle and feed axis;

[0108] Specifically, the coupling coefficient B between the spindle and the feed axis mf include:

[0109]

[0110] Among them, P mf The cross power spectral density, Q, during the vibration of the main spindle and feed shaft mf R represents the high-frequency coupling effect value, used to simulate the high-frequency nonlinear coupling during spindle and feed axis vibration. f This is the low-frequency coupling effect value, used to represent the excitation effect of the feed shaft vibration on the spindle at low frequencies.

[0111] Specifically, the high-frequency coupling effect value Q mf include:

[0112] Q mf =K q ·sin(2ω m )

[0113] Among them, K q This is the high-frequency amplitude coefficient of the spindle under the influence of feed shaft vibration.

[0114] Specifically, the low-frequency coupling effect value R f include:

[0115]

[0116] Among them, K r The low-frequency amplitude coefficient of the feed shaft under the influence of spindle vibration, ω r The low-frequency angular frequency of the feed axis is defined as the angular frequency of the feed axis when it is below a preset threshold.

[0117] Step 102: Obtain the amplitude, angular frequency, phase, intensity, and second harmonic amplitude of the spindle's own vibration. Combine this with the coupling coefficient between the spindle and the feed axis and the power spectral density of the feed axis during vibration to calculate the spindle vibration response value, thereby completing the spindle vibration analysis.

[0118] Specifically, calculating the spindle vibration response value includes:

[0119] V m (t)=A m ·sin(ωm ·t+φ m )+B mf ·P f +C m ·sin 2 (ω m ·t+φ m )+D m ·cos(2ω m ·t)

[0120] Among them, V m (t) is the main shaft vibration response value, A m The amplitude of the main shaft's own vibration, ω m The angular frequency of the main shaft's own vibration, φ m The phase of the main shaft's own vibration, B mf The coupling coefficient between the main spindle and the feed axis, P f C is the power spectral density during feed shaft vibration. m The vibration intensity of the main shaft vibration, D m The amplitude of the second harmonic of the main shaft vibration.

[0121] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0122] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0123] In the several embodiments provided by this invention, it should be understood that the disclosed technical content can be implemented in other ways. The system embodiments described above are merely illustrative; for example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between units or modules, and may be electrical or other forms.

[0124] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0125] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0126] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes: USB flash drives, read-only storage media (ROM), random access storage media (RAM), portable hard drives, magnetic disks, optical disks, and other media capable of storing program code.

[0127] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for acquiring vibration data of a CNC machine tool spindle, used to obtain the spindle vibration response value under the influence of the feed axis, thereby analyzing the vibration condition of the spindle, characterized in that, include: Obtain the cross power spectral density and the power spectral density of the feed axis vibration when the spindle and feed axis vibrate, and calculate the coupling coefficient between the spindle and feed axis. The amplitude, angular frequency, phase, intensity, and second harmonic amplitude of the spindle's own vibration are obtained. Combined with the coupling coefficient between the spindle and the feed axis and the power spectral density of the feed axis during vibration, the vibration response value of the spindle is calculated, thereby completing the vibration analysis of the spindle. The calculation of the spindle vibration response value includes: ， in, In time Spindle vibration response value at time The amplitude of the main shaft's own vibration. The angular frequency of the spindle's own vibration. The phase of the main shaft's own vibration. The coupling coefficient between the main spindle and the feed axis. The power spectral density during feed shaft vibration. The vibration intensity of the main shaft vibration. The amplitude of the second harmonic of the main shaft vibration; The coupling coefficient between the spindle and the feed axis include: ， in, The cross power spectral density during the vibration of the main spindle and feed shaft. This value represents the high-frequency coupling effect, used to simulate the high-frequency nonlinear coupling during spindle and feed axis vibration. This is the low-frequency coupling effect value, used to represent the excitation effect of the feed shaft vibration on the spindle at low frequencies.

2. The vibration data acquisition method for a CNC machine tool spindle as described in claim 1, characterized in that, The high-frequency coupling effect value include: ， in, This is the high-frequency amplitude coefficient of the spindle under the influence of feed shaft vibration.

3. A vibration data acquisition system for a CNC machine tool spindle, used to acquire the spindle vibration response value under the influence of the feed axis, thereby analyzing the vibration condition of the spindle, characterized in that, include: The coupling coefficient calculation module is used to obtain the cross power spectral density and the power spectral density of the feed axis vibration when the spindle and feed axis vibrate, and to calculate the coupling coefficient between the spindle and feed axis. The response value calculation module is used to obtain the amplitude, angular frequency, phase, intensity, and second harmonic amplitude of the spindle's own vibration. Combined with the coupling coefficient between the spindle and the feed axis and the power spectral density of the feed axis during vibration, the module calculates the spindle vibration response value, thereby completing the analysis of the spindle's vibration condition. The calculation of the spindle vibration response value includes: ， in, In time Spindle vibration response value at time The amplitude of the main shaft's own vibration. The angular frequency of the spindle's own vibration. The phase of the main shaft's own vibration. The coupling coefficient between the main spindle and the feed axis. The power spectral density during feed shaft vibration. The vibration intensity of the main shaft vibration. The amplitude of the second harmonic of the main shaft vibration; The coupling coefficient between the spindle and the feed axis include: ， in, The cross power spectral density during the vibration of the main spindle and feed shaft. This value represents the high-frequency coupling effect, used to simulate the high-frequency nonlinear coupling during spindle and feed axis vibration. This is the low-frequency coupling effect value, used to represent the excitation effect of the feed shaft vibration on the spindle at low frequencies.

4. The vibration data acquisition system for a CNC machine tool spindle as described in claim 3, characterized in that, The high-frequency coupling effect value include: ， in, This is the high-frequency amplitude coefficient of the spindle under the influence of feed shaft vibration.

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