High-voltage switch circumferential part tapping processing method

Abstract

The application relates to the technical field of thread cutting, in particular to a tapping machining method for high-voltage switch circumferential parts, which comprises the following steps: determining the quality characteristics of each internal thread tapped in a target time period, so as to determine low-quality internal threads; determining the difference between the tapping machining cutting parameters of the low-quality internal threads and a preset standard parameter range, to obtain the cutting parameter deviation characteristics of the low-quality internal threads; determining target low-quality internal threads affected by the cutting parameters according to the cutting parameter deviation characteristics; and obtaining the correlation between the thread quality and the tapping machining cutting parameters according to the quality characteristics and the cutting parameter deviation characteristics of the target low-quality internal threads, so as to update the tapping machining cutting parameters, so that the adjustment range of the tapping machining cutting parameters is adapted to the actual situation of the current tapping machining quality of the circumferential part, and the quality stability and reliability of the tapping machining can be significantly improved.

Description

Technical Field

[0001] This invention relates to the field of thread cutting technology, specifically to a tapping method for circumferential parts of high-voltage switches. Background Technology

[0002] High-voltage switchgear, as a core piece of equipment in the power system, directly determines the safe and stable operation of the power grid. High-voltage switchgear involves several circumferential parts, such as insulators, flanges, and moving / stationary contact seats. The quality of tapping these circumferential parts is crucial for ensuring the assembly accuracy, mechanical strength, electrical performance, and service life of the high-voltage switchgear. Tapping is a cutting (or extrusion) process that creates internal threads on a pre-fabricated surface of an inner hole. Currently, semi-automatic tapping equipment is the most common method. However, in the tapping of circumferential parts in high-voltage switchgear, factors such as equipment wear (e.g., decreased spindle accuracy, unstable hydraulic or pneumatic systems) and the characteristics of the material being processed (e.g., uneven material hardness, thermal expansion) can cause the originally set tapping cutting parameters to deviate from the preset values ​​during actual processing. This affects the tapping quality, significantly reducing the quality of the internal threads and preventing proper fit between the threads and other components, potentially leading to more serious accidents.

[0003] The current method for adjusting tapping cutting parameters is to periodically update them with a fixed adjustment range at fixed time intervals. This method is relatively crude and unreliable. For example, the fixed adjustment range may not be compatible with the actual tapping quality of circumferential parts, resulting in the tapping quality requirements still not being met when using the adjusted tapping cutting parameters for tapping control. Summary of the Invention

[0004] The technical problem that this invention aims to solve is that the reliability of the tapping cutting parameter adjustment method is not high during the tapping process of circumferential parts of high-voltage switches, which affects the tapping quality.

[0005] The purpose of this invention is to provide a tapping method for circumferential parts of high-voltage switches, and the specific technical solution adopted is as follows: This invention provides a tapping method for circumferential parts of high-voltage switches, comprising: Determine the quality characteristics of each internal thread produced by tapping within the target time period; Based on the aforementioned quality characteristics, low-quality internal threads are identified; The difference between the tapping cutting parameters of the low-quality internal thread and the preset standard parameter range is determined to obtain the cutting parameter deviation characteristics of the low-quality internal thread; The target low-quality internal thread affected by the cutting parameters is determined by the deviation characteristics of the cutting parameters; The degree of correlation is obtained based on the quality characteristics and cutting parameter deviation characteristics of the target low-quality internal thread; the degree of correlation characterizes the relationship between thread quality and tapping cutting parameters. Based on the degree of correlation, update the tapping cutting parameters to indicate whether to perform tapping.

[0006] In an exemplary embodiment, the process of obtaining the quality characteristics includes: Determine the degree of pitch anomaly in the pitch sequence of the internal thread; the pitch sequence is composed of the arrangement of each pitch in the internal thread; Determine the deviation between the pitch diameter of the internal thread and the preset standard pitch diameter; The quality characteristics are obtained based on the degree of pitch anomaly and the pitch diameter deviation; the quality characteristics are inversely correlated with both the degree of pitch anomaly and the pitch diameter deviation.

[0007] In an exemplary embodiment, the process of obtaining the pitch anomaly degree includes: Determine the degree of fluctuation in the pitch sequence and the deviation sequence between the pitch sequence and the preset standard pitch; The abnormal pitch is obtained from the deviation sequence; The pitch anomaly degree is obtained based on the fluctuation level, the number of abnormal pitches, and the maximum deviation in the deviation sequence; the pitch anomaly degree is positively correlated with the fluctuation level, the number of abnormal pitches, and the maximum deviation.

[0008] In an exemplary embodiment, the process of obtaining the low-quality internal thread includes: identifying internal threads whose quality characteristics are less than or equal to a preset quality threshold as the low-quality internal thread.

[0009] In an exemplary embodiment, the process of obtaining the cutting parameter deviation feature includes: Determine the number of abnormal index moments, wherein the abnormal index moments are the moments when the parameter values ​​of the tapping cutting parameters at each moment exceed the preset standard parameter range; Determine the extent to which the parameter values ​​of each indicator exceed the preset standard parameter range at abnormal times; The cutting parameter deviation characteristics are obtained based on the number of abnormal moments of the indicators, the degree of excess of each abnormal moment of the indicators, and the range of the tapping cutting parameters; the cutting parameter deviation characteristics are positively correlated with the number of abnormal moments of the indicators, the degree of excess of each abnormal moment of the indicators, and the range.

[0010] In an exemplary embodiment, after obtaining the cutting parameter deviation characteristics of the low-quality internal thread, the tapping method for the high-voltage switch circumferential parts further includes: Determine the degree of difference in tapping cutting parameters between the low-quality internal thread and each other low-quality internal thread; Based on the degree of difference, the deviation characteristics of the cutting parameters of the low-quality internal thread are positively corrected.

[0011] In an exemplary embodiment, the process of determining the target low-quality internal thread includes: Low-quality internal threads whose cutting parameters deviate from the characteristic feature by a factor greater than or equal to a preset parameter deviation characteristic threshold are identified as the target low-quality internal threads.

[0012] In an exemplary embodiment, the process of obtaining the degree of association includes: The overall quality characteristics are obtained from the quality characteristics of each target low-quality internal thread, and the overall cutting parameter deviation characteristics are obtained from the cutting parameter deviation characteristics of each target low-quality internal thread; The degree of correlation is obtained based on the overall quality characteristics and the overall deviation of cutting parameters from the overall characteristics; the degree of correlation is inversely correlated with the overall quality characteristics and positively correlated with the overall deviation of cutting parameters from the overall characteristics.

[0013] In an exemplary embodiment, updating the tapping cutting parameters based on the correlation degree includes: Based on the degree of correlation, the influence weights of the tapping cutting parameters are obtained; Based on the correlation degree and influence weight, adjustment coefficients for tapping cutting parameters are obtained; the adjustment coefficients are positively correlated with both the correlation degree and influence weight. Update the tapping cutting parameters based on the adjustment coefficient and the current preset parameter values ​​of the tapping cutting parameters.

[0014] In an exemplary embodiment, updating the tapping cutting parameters based on the adjustment coefficient and the current preset parameter values ​​of the tapping cutting parameters includes: The adjustment amount of the tapping cutting parameters is obtained by multiplying the adjustment coefficient by the current preset parameter value. Calculate the average of the parameter differences between the parameter values ​​at abnormal times of each indicator and the current preset parameter values; When the average value of the parameter difference is greater than 0, the difference between the current preset parameter value and the adjustment amount of the tapping cutting parameter is used as the updated tapping cutting parameter; When the average value of the parameter difference is less than 0, the sum of the current preset parameter value and the adjustment amount of the tapping cutting parameter is used as the updated tapping cutting parameter.

[0015] This invention offers the following advantages: It identifies low-quality internal threads, i.e., low-quality tapping processes, by utilizing quality characteristics, thus pinpointing the problem and providing a foundation for subsequent data analysis. This allows for rapid problem focusing, concentrating analytical resources on processing results with quality risks, and improving the efficiency and relevance of subsequent analysis steps. Analyzing the tapping cutting parameters of low-quality internal threads reveals deviation characteristics from preset standard parameter ranges, establishing a preliminary data link between quality results and process parameters, providing crucial clues for finding causal relationships. Since not all low-quality internal threads are caused by deviations in tapping cutting parameters, the deviation characteristics of cutting parameters screen out target low-quality internal threads affected by these parameters, eliminating interference noise from other data and improving efficiency. To ensure the purity of causal analysis and that subsequent correlation analysis is based on genuine quality cases relevant to the parameters, the analysis conclusions are more reliable and adjustment decisions are more accurate. Based on the quality characteristics and cutting parameter deviation characteristics of the target low-quality internal thread, the correlation between thread quality and tapping cutting parameters is obtained, achieving a leap from observing correlation to quantifying its causal strength. This provides a direct mathematical or logical basis for precise adjustment, completely replacing fixed adjustment ranges based on experience. Finally, based on the degree of correlation, the tapping cutting parameters are updated, ensuring that the adjustment range of the tapping cutting parameters matches the actual tapping quality of circumferential parts. This ensures that the tapping quality requirements are met when using the adjusted tapping cutting parameters for tapping control, significantly improving the quality stability and reliability of tapping. Attached Figure Description

[0016] Figure 1 This is a flowchart of a tapping method for a high-voltage switch circumferential part provided in one embodiment of the present invention; Figure 2 This is a flowchart illustrating the acquisition of quality features according to an embodiment of the present invention; Figure 3 This is a flowchart illustrating the acquisition of cutting parameter deviation features according to an embodiment of the present invention. Detailed Implementation

[0017] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the specific implementation methods, structures, features, and effects of the present invention are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. All data and information collected in this application have been obtained with full consent.

[0019] This embodiment provides a tapping method for circumferential parts of a high-voltage switch. It adjusts and updates the current tapping cutting parameters based on the quality of the current tapping process, using these parameters as the cutting parameters for subsequent tapping operations, thus achieving tapping control. In this embodiment, the tapping parameters for all internal threads are the same; that is, all internal threads obtained through tapping are obtained using the same parameters. The same tapping equipment is used to process the circumferential parts of the high-voltage switch. It should be understood that only one internal thread may be processed on the same circumferential part, or multiple internal threads may be processed; this embodiment does not impose any limitations.

[0020] This embodiment sets multiple target time periods in terms of timing, each serving as a control cycle for a specific tapping process. The duration of each target time period is set based on actual conditions, such as the machining time of an internal thread on a circumferential part, thus ensuring that multiple internal threads can be machined within the target time period. For example, if the machining time of an internal thread is approximately 10 seconds, the target time period could be 10 minutes. Each tapping operation produces one internal thread, which consists of a set of continuous thread profiles. Therefore, within the target time period, the tapping equipment sequentially taps multiple circumferential parts, resulting in multiple internal threads.

[0021] Based on the tapping quality during a specific target time period, the tapping cutting parameters for that period are adjusted and updated to obtain the tapping cutting parameters for the next target time period, thus achieving tapping control for that next target time period. This embodiment uses any target time period as the current target time period for illustration.

[0022] like Figure 1 As shown in the figure, the tapping method for a high-voltage switch circumferential part provided in this embodiment includes the following steps: Step S1: Determine the quality characteristics of each internal thread produced by tapping within the target time period; Step S2: Based on quality characteristics, identify low-quality internal threads; Step S3: Determine the difference between the tapping cutting parameters of the low-quality internal thread and the preset standard parameter range, and obtain the deviation characteristics of the cutting parameters of the low-quality internal thread; Step S4: Determine the target low-quality internal thread affected by the cutting parameters based on the deviation characteristics of the cutting parameters; Step S5: Determine the degree of correlation based on the quality characteristics and cutting parameter deviation characteristics of the target low-quality internal thread; Step S6: Update the tapping cutting parameters according to the correlation level to indicate the tapping process.

[0023] The following is a detailed explanation of each step.

[0024] Step S1: Determine the quality characteristics of each internal thread produced by tapping within the target time period.

[0025] The dimensional accuracy of the internal thread determines the fit performance between the thread and the bolt and is the foundation of tapping quality. It usually includes the thread pitch diameter, thread pitch, etc. Under a stable tapping process, all dimensions of the thread should strictly conform to the design drawings and national standards, and the dimensional fluctuations should be within a very small range.

[0026] In an exemplary embodiment, the circumferential parts of the high-voltage switch commonly use 6H-grade internal threads, with a nominal pitch diameter (i.e., the preset standard pitch diameter, where pitch diameter is the diameter) of 9.026 mm (mm in this embodiment represents millimeters), an upper deviation of +0.125 mm, and a lower deviation of 0; a nominal pitch (i.e., the preset standard pitch) of 1.5 mm, a deviation between the actual pitch of a single thread turn and the nominal pitch of ≤ ±0.03 mm, and a cumulative pitch deviation of ≤ ±0.1 mm for multi-turn threads; and a standard internal thread length of 100 mm. If the pitch diameter and pitch of the machined internal thread fluctuate beyond the allowable range, it indicates that problems such as decreased accuracy of the tapping equipment, insufficient stability of the tapping equipment, or unreasonable cutting parameters may have occurred during the machining process, causing the pitch diameter and pitch of the thread to exceed the normal range and reducing the machining quality. Therefore, it is necessary to first determine the quality characteristics of each internal thread machined within the target time period based on the dimensional parameters of each internal thread completed within the target time period. Figure 2 As shown, the following is a specific process for obtaining quality characteristics: Step S11: Determine the degree of pitch anomaly in the pitch sequence of the internal thread.

[0027] This embodiment uses any internal thread within a target time period as an example. The internal thread consists of multiple turns arranged along the axial direction. The linear distance between corresponding points of every two adjacent turns of thread in the axial direction is obtained to obtain each pitch. These pitches are arranged along the axial direction to form a pitch sequence. To facilitate data processing, in this embodiment, the ratio of each pitch in the pitch sequence to a preset standard pitch is calculated, thereby eliminating dimensions. The obtained ratios are then used to reconstruct a new pitch sequence in the original pitch sequence order. This pitch sequence is a dimensionless data sequence, and the pitch sequences mentioned below refer to this dimensionless data sequence. The preset standard pitch is the ideal size of the internal thread of this dimension without deviation, i.e., the ideal pitch in the internal thread design.

[0028] The degree of pitch anomaly in the internal thread is determined by the difference between the pitch sequence and the preset standard pitch. The degree of pitch anomaly in the internal thread characterizes the degree of abnormality in the actual pitch of the internal thread relative to the preset standard pitch.

[0029] In an exemplary embodiment, the degree of fluctuation of the pitch sequence is determined. In this embodiment, the degree of fluctuation is represented by the standard deviation. The standard deviation of the pitch sequence is calculated to represent the stability of the pitch. The smaller the standard deviation, the more stable the pitch distribution and the lower the degree of pitch anomaly of the internal thread. The two are positively correlated.

[0030] Based on the pitch sequence and the preset standard pitch, a deviation sequence of the pitch sequence is obtained. Since the dimension was eliminated by dividing by the preset standard pitch as mentioned above, the dimension of the preset standard pitch is also eliminated here by dividing it by itself, resulting in 1. Therefore, subtracting 1 from each pitch in the pitch sequence yields the pitch deviation value. These deviation values ​​are then sorted according to the order of the pitch sequence to obtain the pitch deviation sequence. The pitch deviation values ​​in this sequence can be positive, negative, or 0. A positive value indicates that the actual pitch is greater than the preset standard pitch; a negative value indicates that the actual pitch is less than the preset standard pitch; and 0 indicates that the actual pitch is equal to the preset standard pitch. Simultaneously, the maximum absolute value of each pitch deviation value in the deviation sequence is obtained as the maximum deviation in the deviation sequence. The larger the maximum deviation in the deviation sequence, the higher the degree of pitch abnormality of the internal thread; the two are positively correlated.

[0031] Based on the pitch deviation values ​​in the deviation sequence, abnormal pitches in the pitch sequence are obtained. In an exemplary embodiment, a preset pitch deviation threshold is used to compare with the absolute values ​​of each pitch deviation value, thereby identifying the pitch with the larger absolute value as the abnormal pitch. The specific value of this pitch deviation threshold is set according to actual judgment needs, such as 0.03mm as mentioned above. By comparing the absolute values ​​of each pitch deviation value in the deviation sequence with the pitch deviation threshold, pitches greater than the pitch deviation threshold are identified as abnormal pitches, thus obtaining the number of abnormal pitches. The more abnormal pitches there are, the higher the degree of pitch abnormality of the internal thread; the two are positively correlated.

[0032] The degree of pitch anomaly in the pitch sequence is obtained based on the standard deviation of the pitch sequence, the number of abnormal pitches, and the maximum deviation in the deviation sequence. Following the logical analysis above, a specific method for calculating the degree of pitch anomaly is given below: ; in, Indicates the degree of pitch abnormality in internal threads. The standard deviation of the pitch sequence is represented. Indicates the number of abnormal pitches. This represents the total number of pitches in the pitch sequence of internal threads. This indicates the percentage of abnormal pitches. This represents the maximum deviation in the deviation sequence. This represents the normalization function, where maximum and minimum value normalization is used. Specifically, it obtains the values ​​of each internal thread within the target time period. Find the maximum and minimum values ​​in the range, and then normalize them using the maximum and minimum value normalization method.

[0033] Using the above method, the pitch anomaly degree of each internal thread within the target time period is obtained. The higher the pitch anomaly degree of the internal thread, the lower the accuracy of the tapping process, the more unstable the processing technology, the worse the tapping quality of the internal thread, and the lower its quality characteristics; the two are inversely correlated.

[0034] Step S12: Determine the deviation between the pitch diameter of the internal thread and the preset standard pitch diameter.

[0035] Obtain the deviation between the pitch diameter of the internal thread (i.e., the actual measured pitch diameter) and a preset standard pitch diameter. The preset standard pitch diameter is the ideal pitch diameter of the internal thread of that size without deviation. In an exemplary embodiment, the pitch diameter deviation is calculated as follows: calculate the absolute value of the difference between the internal thread's pitch diameter and the preset standard pitch diameter, then calculate the ratio of this absolute value to the preset standard pitch diameter, and finally normalize this ratio using a maximum and minimum value normalization method. The result is taken as the pitch diameter deviation. The maximum and minimum value normalization is achieved by obtaining the maximum and minimum values ​​of this ratio for each internal thread within a target time period, and then normalizing the ratio using the maximum and minimum value normalization method. The pitch diameter deviation is essentially the relative rate of change of the actual pitch diameter of the internal thread relative to the preset standard pitch diameter.

[0036] Using the above method, the pitch diameter deviation of each internal thread within the target time period is obtained. The larger the pitch diameter deviation of the internal thread, the more unstable the tapping process of the internal thread is, resulting in larger dimensional deviation and shape error, causing it to deviate from the standard size. This indicates that the tapping quality of the internal thread is worse and its quality characteristics are lower. The two are inversely correlated.

[0037] Step S13: Obtain the quality characteristics based on the degree of pitch abnormality and the pitch diameter deviation.

[0038] The quality characteristics of the internal thread are obtained based on the degree of pitch abnormality and the pitch diameter deviation. Based on the above logical analysis, in an exemplary embodiment, a specific calculation method for the quality characteristics is given below: ; in, This indicates the quality characteristics of the internal thread. This indicates the deviation of the pitch diameter of the internal thread.

[0039] Step S2: Based on quality characteristics, identify low-quality internal threads.

[0040] Step S1 obtains the quality characteristics of each internal thread within the target time period. A higher quality characteristic value indicates a higher tapping quality and a higher-quality internal thread; conversely, a lower quality characteristic value indicates a lower tapping quality and a lower-quality internal thread. In an exemplary embodiment, a quality threshold is preset. This threshold is used to compare with the quality characteristics of each internal thread within the target time period to determine the quality characteristic with the smaller value. The quality threshold ranges from 0 to 1, and the specific value is set according to actual needs. As an example, this embodiment uses 0.6.

[0041] The internal threads corresponding to quality characteristics less than or equal to a preset quality threshold are identified, and these internal threads are defined as low-quality internal threads. Since each internal thread corresponds to a tapping process, the tapping process for each low-quality internal thread is defined as a low-quality tapping process.

[0042] It should be understood that if there are no low-quality internal threads, then all internal threads within the target time period are considered to be of normal quality, and there is no need to adjust the tapping cutting parameters for the next time period. Therefore, the following processing procedure will not be performed.

[0043] Step S3: Determine the difference between the tapping cutting parameters of the low-quality internal thread and the preset standard parameter range, and obtain the cutting parameter deviation characteristics of the low-quality internal thread.

[0044] Tapping cutting parameters are factors that can be adjusted to improve machining quality. In order to improve the subsequent tapping quality, it is necessary to take low-quality internal threads as the analysis object and further analyze and adjust the tapping cutting parameters that affect the machining quality.

[0045] The data types included in the tapping cutting parameters are set according to the actual situation, and typically include: tapping tool rotation speed (i.e., cutting speed), cutting fluid flow rate, and tapping tool feed rate. In this embodiment, the tapping cutting parameters include at least one of the following: tapping tool rotation speed, cutting fluid flow rate, and tapping tool feed rate. This embodiment takes the simultaneous inclusion of all three as an example. Therefore, each internal thread acquires three tapping cutting parameters: tapping tool rotation speed, cutting fluid flow rate, and tapping tool feed rate.

[0046] For collecting the rotational speed of the tapping tool: The rotational speed of the tapping tool is collected by a speed sensor, specifically a photoelectric speed sensor, which is fixed in a suitable position on the tapping equipment. For example, a bracket is used to firmly install the photoelectric speed sensor on the tapping machine housing, ensuring that its transmitter and receiver are accurately aligned with the reflective mark or light-transmitting gap on the tapping tool spindle. The output signal of the photoelectric speed sensor is the number of revolutions per unit time, that is, the number of revolutions per minute of the spindle. The output signal of the photoelectric speed sensor is connected to a data acquisition device. When the tapping equipment starts processing, the data acquisition device records the speed signal transmitted by the photoelectric speed sensor in real time. It should be understood that there is a conversion relationship between the number of revolutions per unit time and the tapping tool rotational speed, for example: tapping tool rotational speed = π × tool diameter (i.e., preset standard pitch diameter) × number of revolutions per minute of the spindle / 1000, unit: m / min. π represents pi. During the tapping process of an internal thread, the tapping tool rotational speed is continuously collected according to a preset sampling frequency, forming a data sequence of the tapping tool rotational speed changing over time.

[0047] For collecting cutting fluid flow rate data: An electromagnetic flow meter is installed in the cutting fluid supply pipeline. The electromagnetic flow meter collects the cutting fluid flow rate during the internal thread tapping process and outputs it to the data acquisition device. As the tapping process continues, the cutting fluid flow rate is continuously collected according to a preset sampling frequency, forming a data sequence of cutting fluid flow rate changes over time.

[0048] For the acquisition of tapping tool feed rate: The tapping tool feed rate is the axial speed of the tapping tool, representing the amount of feed per unit time. The tapping tool feed rate can be acquired using a laser displacement sensor. The laser displacement sensor is fixed at a suitable position on the tapping equipment, so that its emitted laser beam is perpendicularly irradiated onto the axially moving parts of the tapping tool, such as the tool chuck or tool holder, thereby acquiring the tapping tool feed rate. During the tapping process of an internal thread, the tapping tool feed rate is continuously acquired according to a preset sampling frequency, forming a data sequence of the tapping tool feed rate changing over time. In this embodiment, the sampling frequencies of the tapping tool rotation speed, cutting fluid flow rate, and tapping tool feed rate can be the same, for example, all set to 20Hz.

[0049] For various tapping cutting parameters, this embodiment sets corresponding preset standard parameters within the current target time period, including preset standard tapping tool rotation speed, preset standard cutting fluid flow rate, and preset standard tapping tool feed rate. These preset standard parameters are data configured within the tapping equipment to control the equipment to perform tapping operations according to these data within the current target time period. However, in actual processing, the measured tapping cutting parameters may differ somewhat from the corresponding preset standard parameters.

[0050] Using preset standard parameters as the center, determine the corresponding standard parameter range. For example, use ±10% of the preset standard parameters as the standard parameter range, which represents the allowable fluctuation range. The standard parameter range includes the preset standard tapping tool rotation speed range, the preset standard cutting fluid flow rate range, and the preset standard tapping tool feed rate range.

[0051] The differences between the tapping cutting parameters for each low-quality internal thread and the preset standard parameter range are determined, thus obtaining the deviation characteristics of the cutting parameters for each low-quality internal thread. This embodiment uses any one low-quality internal thread as an example for illustration. Figure 3 As shown, the following is a specific process for obtaining the deviation characteristics of cutting parameters: Step S31: Determine the number of times the indicator is abnormal.

[0052] For tapping low-quality internal threads, the tapping time period is defined as the time span of one tapping operation. The tapping cutting parameters at each moment within this time period are arranged chronologically to obtain a tapping cutting parameter sequence. It is then determined whether the parameter values ​​at each moment in the sequence are within a preset standard parameter range. Moments exceeding this range are defined as abnormal moments, and the number of abnormal moments within the tapping time period is calculated. A higher number of abnormal moments indicates more abnormal fluctuations in the tapping cutting parameters and a stronger deviation in the cutting parameters during that tapping operation; the two are positively correlated.

[0053] Taking the tapping tool rotation speed as an example of the tapping machining cutting parameter, the tapping tool rotation speed sequence is obtained by arranging the tapping tool rotation speed at each moment in the tapping machining time period. It is then determined whether the value of the tapping tool rotation speed at each moment in the sequence is within the preset standard tapping tool rotation speed range. This identifies the moments that exceed the preset standard tapping tool rotation speed range and defines these moments as abnormal index moments, specifically moments when the tapping tool rotation speed exhibits abnormalities. The number of abnormal index moments within the tapping machining time period is then determined. The process for obtaining abnormal index moments for cutting fluid flow rate and tapping tool feed rate is similar.

[0054] Step S32: Determine the extent to which the parameter values ​​of each indicator exceed the preset standard parameter range at abnormal times.

[0055] The degree to which the tapping cutting parameters exceed the preset standard parameter range at each abnormal moment is determined. Specifically, for any abnormal moment, if the tapping cutting parameter value is greater than the upper limit of the preset standard parameter range, the parameter value is subtracted from the upper limit, and the ratio of this difference to the preset standard parameter value is taken as the degree of deviation for that abnormal moment. If the tapping cutting parameter value is less than the lower limit of the preset standard parameter range, the lower limit is subtracted from the parameter value, and the ratio of this difference to the preset standard parameter value is taken as the degree of deviation for that abnormal moment. If the tapping cutting parameter value is within the preset standard parameter range, the degree of deviation for that abnormal moment is set to 0. A higher degree of deviation from the preset standard parameter range indicates a more severe deviation of the parameter values ​​from the normal range during the tapping process, and a stronger deviation in the cutting parameters; the two are positively correlated.

[0056] Taking the tapping tool rotation speed as an example of the tapping machining cutting parameter, for any abnormal moment of an indicator, if the value of the tapping tool rotation speed at that moment is greater than the upper limit of the preset standard tapping tool rotation speed range, then the parameter value is subtracted from the upper limit, and the ratio of the difference to the preset standard tapping tool rotation speed is taken as the degree of exceedance for that abnormal moment. If the value of the tapping tool rotation speed at that moment is less than the lower limit of the preset standard tapping tool rotation speed range, then the lower limit is subtracted from the parameter value, and the ratio of the difference to the preset standard tapping tool rotation speed is taken as the degree of exceedance for that abnormal moment. If the value of the tapping tool rotation speed at that moment is within the preset standard tapping tool rotation speed range, then the degree of exceedance for that abnormal moment is set to 0. The process for obtaining the degree of exceedance for each abnormal moment of an indicator of cutting fluid flow rate and tapping tool feed rate is similar.

[0057] Step S33: Based on the number of abnormal moments of the indicators, the degree of exceedance of each abnormal moment of the indicators, and the range of the tapping cutting parameters, the deviation characteristics of the cutting parameters are obtained.

[0058] Obtain the maximum and minimum values ​​in the tapping cutting parameter sequence, and calculate the difference between the maximum and minimum values ​​to obtain the range of the tapping cutting parameters. The larger the range, the greater the fluctuation range of the tapping cutting parameter sequence, and the stronger the deviation characteristic of the cutting parameters; the two are positively correlated. Using this, obtain the ranges corresponding to the tapping tool rotation speed, cutting fluid flow rate, and tapping tool feed rate, respectively.

[0059] Based on the number of abnormal moments in the indicators of low-quality internal threads, the degree of deviation of each abnormal moment, and the range of tapping cutting parameters, the deviation characteristics of cutting parameters for low-quality internal threads are obtained. Based on the above logical analysis, a specific process for obtaining the deviation characteristics of cutting parameters is given below: Calculate the average degree of deviation of each abnormal moment within the tapping time period of the low-quality internal thread as the overall deviation degree. Then, the calculation formula for the deviation characteristics of cutting parameters is as follows: ; in, This indicates the deviation of cutting parameters from the characteristics of low-quality internal threads. This indicates the number of times the indicator is abnormal. This represents the total number of moments within the tapping time period for low-quality internal threads. This indicates the percentage of times the indicator is abnormal. This indicates the extent to which the low-quality internal thread exceeds the acceptable limit. This represents the range of cutting parameters for tapping low-quality internal threads. This represents the value of the preset standard parameters for tapping cutting parameters. This represents the relative rate of change of the range with respect to a preset standard parameter, while eliminating the influence of dimensions. The normalization method here is a maximum / minimum value normalization method; specifically: obtaining the values ​​of each low-quality internal thread... The maximum and minimum values ​​in the data are then normalized using a maximum-minimum normalization method. The greater the deviation of the cutting parameters from the characteristic values, the greater the impact on the tapping quality.

[0060] Using the above calculation process, each parameter in the calculation formula for the deviation characteristics of cutting parameters is replaced with the corresponding data of tapping tool rotation speed, cutting fluid flow rate and tapping tool feed speed, respectively, to obtain the deviation characteristics of three cutting parameters for low-quality internal threads in terms of tapping tool rotation speed, cutting fluid flow rate and tapping tool feed speed.

[0061] In one exemplary embodiment, this embodiment can also correct the deviation characteristics of the cutting parameters of low-quality internal threads based on the degree of difference in the tapping cutting parameters between low-quality internal threads, so as to further improve the reliability of the deviation characteristics of the cutting parameters of low-quality internal threads.

[0062] For any low-quality internal thread, the degree of difference between the tapping cutting parameter sequence of this low-quality internal thread and the tapping cutting parameter sequences of every other low-quality internal thread is obtained. The degree of difference characterizes the difference between the two sequences. In an exemplary embodiment, the Euclidean distance between the tapping cutting parameter sequence of this low-quality internal thread and the tapping cutting parameter sequences of every other low-quality internal thread is calculated. It should be understood that, under normal circumstances, the tapping cutting parameter sequences of each internal thread contain the same amount of data. If, under special circumstances, the amount of data contained is different, the tapping cutting parameter sequences can be resampled to ensure that the sequences are aligned in time.

[0063] The above method allows us to obtain the Euclidean distance between the tapping cutting parameter sequences of each low-quality internal thread and the tapping cutting parameter sequences of every other low-quality internal thread. The larger the Euclidean distance, the greater the difference between the two low-quality internal thread tapping cutting parameter sequences, i.e., the higher the degree of difference. This embodiment obtains the degree of difference as follows: We obtain the maximum and minimum values ​​of the Euclidean distances between the tapping cutting parameter sequences of each low-quality internal thread and the tapping cutting parameter sequences of every other low-quality internal thread. Then, we normalize each Euclidean distance using a maximum / minimum value normalization method. The normalized result is used as the degree of difference between the corresponding two low-quality internal thread tapping cutting parameter sequences. Thus, we obtain the degree of difference between the tapping cutting parameter sequence of this low-quality internal thread and the tapping cutting parameter sequences of every other low-quality internal thread.

[0064] The average value of the difference between the tapping cutting parameter sequence of the low-quality internal thread and the tapping cutting parameter sequences of every other low-quality internal thread is calculated. The larger this average value, the greater the difference between the tapping cutting parameter sequence of the low-quality internal thread and the other low-quality internal thread sequences, the lower the similarity of the tapping process of the low-quality internal thread and the other low-quality internal thread tapping process, the more abnormal the tapping process of the low-quality internal thread, and the greater the deviation of the cutting parameters of the low-quality internal thread. Therefore, based on the average value of the difference corresponding to the low-quality internal thread, the deviation of the cutting parameters of the low-quality internal thread is positively corrected. In an exemplary embodiment, the average value of the difference corresponding to the low-quality internal thread is multiplied by the deviation of the cutting parameters of the low-quality internal thread, and the result is used as the corrected deviation of the cutting parameters of the low-quality internal thread, thus obtaining the corrected deviation of the cutting parameters of each low-quality internal thread. The cutting parameter deviation features mentioned below are all corrected deviation features.

[0065] It should be understood that this embodiment may also omit the above-mentioned correction process for the cutting parameter deviation features. In this case, the cutting parameter deviation features mentioned below are all the cutting parameter deviation features before correction.

[0066] Using the above-described correction process for cutting parameter deviation characteristics, the degree of difference between the tapping tool rotation speed sequence of the low-quality internal thread and the tapping tool rotation speed sequences of other low-quality internal threads is determined, thereby correcting the cutting parameter deviation characteristics of the tapping tool rotation speed of the low-quality internal thread; the degree of difference between the cutting fluid flow rate sequence of the low-quality internal thread and the cutting fluid flow rate sequence of other low-quality internal threads is determined, thereby correcting the cutting parameter deviation characteristics of the cutting fluid flow rate of the low-quality internal thread; the degree of difference between the tapping tool feed rate sequence of the low-quality internal thread and the tapping tool feed rate sequence of other low-quality internal threads is determined, thereby correcting the cutting parameter deviation characteristics of the tapping tool feed rate of the low-quality internal thread.

[0067] Step S4: Determine the target low-quality internal thread affected by the cutting parameters based on the deviation characteristics of the cutting parameters.

[0068] Step S3 obtains the cutting parameter deviation characteristics of each low-quality internal thread. The larger the value of the cutting parameter deviation characteristics, the more the low tapping quality of the low-quality internal thread is caused by the cutting parameters, and the more the tapping process can be recorded as a low-quality tapping process affected by the cutting parameters. Correspondingly, the smaller the value of the cutting parameter deviation characteristics, the smaller the influence of the cutting parameters on the low tapping quality of the low-quality internal thread.

[0069] Based on the cutting parameter deviation characteristics of each low-quality internal thread, the target low-quality internal thread affected by the cutting parameters is determined from among the low-quality internal threads. In an exemplary embodiment, this embodiment presets a parameter deviation characteristic threshold, which is used to compare with the cutting parameter deviation characteristics of each low-quality internal thread to determine the cutting parameter deviation characteristic with the larger value. The value range of this parameter deviation characteristic threshold is 0 to 1, and the specific value is set according to the actual judgment needs. This embodiment takes 0.5 as an example. The low-quality internal thread corresponding to the cutting parameter deviation characteristic greater than or equal to the parameter deviation characteristic threshold is determined as the target low-quality internal thread. Then, the tapping process of the target low-quality internal thread is recorded as the low-quality tapping process affected by the cutting parameters.

[0070] It should be understood that if there is no target low-quality internal thread, it is determined that there is no low-quality tapping process affected by cutting parameters within the target time period. Therefore, there is no need to adjust the tapping cutting parameters for the next time period, and the following processing procedure will not be performed.

[0071] It should be noted that for any low-quality internal thread, the tapping tool rotation speed, cutting fluid flow rate, and tapping tool feed rate each correspond to one cutting parameter deviation feature, resulting in a total of three cutting parameter deviation features. The average value of these three cutting parameter deviation features is then calculated as the final cutting parameter deviation feature of the low-quality internal thread. This value represents the degree of comprehensive influence of cutting parameters on the low-quality internal thread during the tapping process and is used to compare with the parameter deviation feature threshold to determine whether the low-quality internal thread is the target low-quality internal thread.

[0072] Step S5: Obtain the degree of correlation based on the quality characteristics and cutting parameter deviation characteristics of the target low-quality internal thread.

[0073] This step focuses on analyzing the target low-quality internal thread. For any target low-quality internal thread, the correlation degree is obtained based on its quality characteristics and cutting parameter deviation characteristics. The correlation degree characterizes the relationship between thread quality and tapping cutting parameters, that is, the degree to which tapping cutting parameters affect thread tapping quality. Specifically, the lower the quality characteristic, the greater the impact of cutting parameter deviation characteristics on the thread tapping quality of the target low-quality internal thread; the higher the correlation degree, the inversely correlated the correlation degree is with the quality characteristic. Conversely, the higher the cutting parameter deviation characteristics, the greater the impact of cutting parameter deviation characteristics on the thread tapping quality of the target low-quality internal thread; the higher the correlation degree, the positively correlated the correlation degree is with the cutting parameter deviation characteristics.

[0074] In an exemplary embodiment, the overall quality characteristics are obtained from the quality characteristics of each target low-quality internal thread, specifically the average value of the quality characteristics of each target low-quality internal thread; the overall cutting parameter deviation characteristics are obtained from the cutting parameter deviation characteristics of each target low-quality internal thread, specifically the average value of the cutting parameter deviation characteristics of each target low-quality internal thread. Therefore, the correlation is inversely correlated with the overall quality characteristics and positively correlated with the overall cutting parameter deviation characteristics.

[0075] Based on the overall quality characteristics and the deviation of cutting parameters from the overall characteristics, the degree of correlation is obtained, and a specific calculation method is given below: ; in, Indicates the degree of correlation. This indicates the overall quality characteristics. This indicates the deviation of cutting parameters from the overall feature. As a weighting factor for the overall impact of the deviation of cutting parameters from the overall characteristics. The larger the value, the lower the quality of the tapping process for each target low-quality internal thread, and the greater the correlation, indicating that all low-quality tapping processes affected by cutting parameters are more significantly influenced by cutting parameters.

[0076] It should be understood that when the cutting parameter deviation feature is specifically the cutting parameter deviation feature of the tapping tool rotation speed, the overall situation of the cutting parameter deviation feature of the tapping tool rotation speed is calculated. Using the above calculation method, the correlation degree for the tapping tool rotation speed is obtained, that is, the degree of influence of the tapping tool rotation speed on all low-quality tapping processes affected by the tapping tool rotation speed. When the cutting parameter deviation feature is specifically the cutting parameter deviation feature of the cutting fluid flow rate, the overall situation of the cutting parameter deviation feature corresponding to the cutting fluid flow rate is calculated. Using the above calculation method, the correlation degree for the cutting fluid flow rate is obtained, that is, the degree of influence of the cutting fluid flow rate on all low-quality tapping processes affected by the cutting fluid flow rate. When the cutting parameter deviation feature is specifically the cutting parameter deviation feature of the tapping tool feed rate, the overall situation of the cutting parameter deviation feature corresponding to the tapping tool feed rate is calculated. Using the above calculation method, the correlation degree for the tapping tool feed rate is obtained, that is, the degree of influence of the tapping tool feed rate on all low-quality tapping processes affected by the tapping tool feed rate.

[0077] Step S6: Update the tapping cutting parameters according to the correlation level to indicate the tapping process.

[0078] After obtaining the correlation degree, the tapping cutting parameters can be updated based on the correlation degree. The higher the correlation degree, the more necessary it is to correct and update the tapping cutting parameters; that is, the influence weight of the tapping cutting parameters is higher during the correction and update process. The influence weight is positively correlated with the correlation degree. In an exemplary embodiment, since the tapping tool rotation speed, cutting fluid flow rate, and tapping tool feed rate each have a corresponding correlation degree, the highest correlation degree is determined from these three. The tapping cutting parameter corresponding to the highest correlation degree is the main influencing indicator determining the tapping quality. For example, if the correlation degree of the tapping tool rotation speed is the highest, then the tapping tool rotation speed is the main influencing indicator determining the tapping quality, and its influence weight is the highest. The influence weights of the cutting fluid flow rate and the tapping tool feed rate are lower than those of the tapping tool rotation speed. The sum of the three influence weights is 1. The weight allocation method is set according to the actual situation. In an exemplary embodiment, the influence weight corresponding to the tapping cutting parameter with the highest correlation degree is 0.4, and the remaining two influence weights are 0.3 each.

[0079] Then, adjustment coefficients for the tapping cutting parameters are obtained based on the correlation degree and influence weight. The adjustment coefficients are positively correlated with both the correlation degree and influence weight. In an exemplary embodiment, the correlation degree and influence weight are multiplied together to obtain the adjustment coefficient. Specifically: the adjustment coefficient for the tapping tool rotation speed is the product of the correlation degree of the tapping tool rotation speed and the influence weight of the tapping tool rotation speed; the adjustment coefficient for the cutting fluid flow rate is the product of the correlation degree of the cutting fluid flow rate and the influence weight of the cutting fluid flow rate; and the adjustment coefficient for the tapping tool feed rate is the product of the correlation degree of the tapping tool feed rate and the influence weight of the tapping tool feed rate.

[0080] The tapping cutting parameters are updated based on the adjustment coefficient and the current preset parameter values. The current preset parameter values ​​are the preset tapping cutting parameters configured in the tapping equipment for the current target time period, i.e., the preset standard parameters of the tapping cutting parameters mentioned above, as described below: Calculate the product of the adjustment coefficient and the current preset parameter value, and use it as the adjustment amount for the tapping cutting parameters.

[0081] Subtract the current preset parameter value from the tapping cutting parameter value at each abnormal moment within the current target time period. A difference greater than 0 indicates the tapping cutting parameter at the abnormal moment is greater than the current preset value, meaning the measured tapping cutting parameter is too high; a difference less than 0 indicates the tapping cutting parameter at the abnormal moment is less than the current preset value, meaning the measured tapping cutting parameter is too low; and a difference equal to 0 indicates the tapping cutting parameter at the abnormal moment is equal to the current preset value. The average difference between the tapping cutting parameter value at each abnormal moment within the current target time period and the current preset parameter value is defined as the average parameter difference. Similarly, when the average parameter difference is greater than 0, it indicates that the tapping cutting parameters at the time of the abnormality are generally higher than the current preset parameter value, that is, the measured tapping cutting parameters are generally higher; when the average parameter difference is less than 0, it indicates that the tapping cutting parameters at the time of the abnormality are generally lower than the current preset parameter value, that is, the measured tapping cutting parameters are generally lower; when the average parameter difference is equal to 0, it indicates that the tapping cutting parameters at the time of the abnormality are generally equal to the current preset parameter value.

[0082] When the average parameter difference is greater than 0, the tapping cutting parameters need to be reduced. The difference between the current preset parameter value and the adjusted tapping cutting parameters is used as the updated tapping cutting parameters. When the average parameter difference is less than 0, the tapping cutting parameters need to be increased. The sum of the current preset parameter value and the adjusted tapping cutting parameters is used as the updated tapping cutting parameters. When the average parameter difference is equal to 0, the tapping cutting parameters do not need to be adjusted; the current preset parameter value is used as the updated tapping cutting parameters.

[0083] Taking the tapping tool rotation speed as an example, the current preset parameter value of the tapping tool rotation speed is determined, which is the preset standard tapping tool rotation speed for the current target time period. The tapping tool rotation speed at each abnormal moment within the current target time period is subtracted from the preset standard tapping tool rotation speed, and the average of the resulting differences is defined as the parameter difference average: When the parameter difference average is greater than 0, it indicates that the tapping tool rotation speed at the abnormal moment is generally greater than the preset standard tapping tool rotation speed, meaning the measured tapping tool rotation speed is generally too high; when the parameter difference average is less than 0, it indicates that the tapping tool rotation speed at the abnormal moment is generally less than the preset standard tapping tool rotation speed, meaning the measured tapping tool rotation speed is generally too low; when the parameter difference average is equal to 0, it indicates that the tapping tool rotation speed at the abnormal moment is generally equal to the preset standard tapping tool rotation speed. The update formula for the tapping tool rotation speed is as follows: ; in, This indicates the updated rotational speed of the tapping tool. This indicates the current preset parameter value of the tapping tool rotation speed, that is, the value of the preset standard tapping tool rotation speed for the current target time period; This indicates the degree of correlation between the rotational speed of the tapping tool and its relative speed. This indicates the weight of the influence of the tapping tool rotation speed. This indicates the adjustment factor for the rotational speed of the tapping tool. This indicates the adjustment amount of the tapping tool rotation speed. When the average parameter difference is greater than 0, the plus or minus sign in the above tapping tool rotation speed update formula... "Take the minus sign" This reduces the tapping tool rotation speed in the next target time period, thus avoiding quality machining problems caused by excessive cutting speed; when the average parameter difference is less than 0, the plus or minus sign in the above tapping tool rotation speed update formula... "Take the minus sign" This increases the tapping tool rotation speed for the next target time period, thus avoiding quality machining problems caused by excessively slow cutting speed. When the average parameter difference is equal to 0, the updated tapping tool rotation speed is equal to the preset standard tapping tool rotation speed for the current target time period. It should be understood that this embodiment can also set a maximum allowable adjustment amount, which is limited to the maximum allowable adjustment amount when the tapping tool rotation speed adjustment amount is greater than the maximum allowable adjustment amount.

[0084] Furthermore, to avoid excessive adjustments that could lead to processing accidents, this embodiment can further optimize the above-mentioned update formula: ; in, The reduction factor is a preset value that is less than 1 and greater than 0. The value is determined based on the actual situation, while ensuring the feasibility of control. For example, the value can be 0.3.

[0085] Similarly, the cutting fluid flow rate and tapping tool feed rate are updated. During the next target time period, the tapping equipment controls the tapping process according to the updated tapping tool rotation speed and cutting fluid flow rate.

[0086] It should be noted that this embodiment uses the conversion relationship between the number of rotations per unit time and the tapping tool's rotational speed to convert the tapping tool's rotational speed into the number of rotations per unit time, and then converts the number of rotations per unit time into the tapping tool's feed rate. The conversion formula is: Tapping tool feed rate = Spindle rotations per minute × Preset standard pitch. Therefore, the tapping tool feed rate can be obtained based on the updated tapping tool rotational speed. The tapping equipment in the next target time period will then be controlled according to this converted tapping tool feed rate to ensure that the machined pitch meets the design requirements. The tapping tool feed rate calculated using the updated formula is only used as a reference for monitoring the tapping equipment's status and is not directly used for control.

[0087] This embodiment achieves continuous adjustment and control of the tapping equipment by continuously updating the tapping cutting parameters, thereby realizing the tapping control of circumferential parts of high-voltage switches.

[0088] This embodiment also provides a tapping system for high-voltage switch circumferential parts, including: a memory and a processor; the memory is connected to the processor, and the memory is used to store program instructions; the processor is used to implement the steps in the above-described tapping method embodiment for high-voltage switch circumferential parts when the program instructions are executed.

[0089] In one exemplary embodiment, the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps in the above-described embodiment of the tapping method for high-voltage switch circumferential parts.

[0090] It should be noted that the order of the above embodiments of the present invention is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. The processes depicted in the accompanying drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0091] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

Claims

1. A tapping method for circumferential parts of a high-voltage switch, characterized in that, include: Determine the quality characteristics of each internal thread produced by tapping within the target time period; Based on the aforementioned quality characteristics, low-quality internal threads are identified; The difference between the tapping cutting parameters of the low-quality internal thread and the preset standard parameter range is determined to obtain the cutting parameter deviation characteristics of the low-quality internal thread; The target low-quality internal thread affected by the cutting parameters is determined by the deviation characteristics of the cutting parameters; The degree of correlation is obtained based on the quality characteristics and cutting parameter deviation characteristics of the target low-quality internal thread; the degree of correlation characterizes the relationship between thread quality and tapping cutting parameters. Based on the degree of correlation, update the tapping cutting parameters to indicate whether to perform tapping.

2. The tapping method for high-voltage switch circumferential parts as described in claim 1, characterized in that, The process of acquiring the quality characteristics includes: Determine the degree of pitch anomaly in the pitch sequence of the internal thread; the pitch sequence is composed of the arrangement of each pitch in the internal thread; Determine the deviation between the pitch diameter of the internal thread and the preset standard pitch diameter; The quality characteristics are obtained based on the degree of pitch anomaly and the pitch diameter deviation; the quality characteristics are inversely correlated with both the degree of pitch anomaly and the pitch diameter deviation.

3. The tapping method for high-voltage switch circumferential parts as described in claim 2, characterized in that, The process of obtaining the pitch anomaly degree includes: Determine the degree of fluctuation in the pitch sequence and the deviation sequence between the pitch sequence and the preset standard pitch; The abnormal pitch is obtained from the deviation sequence; The pitch anomaly degree is obtained based on the fluctuation level, the number of abnormal pitches, and the maximum deviation in the deviation sequence; the pitch anomaly degree is positively correlated with the fluctuation level, the number of abnormal pitches, and the maximum deviation.

4. The tapping method for high-voltage switch circumferential parts as described in claim 1, characterized in that, The process of obtaining the low-quality internal thread includes: identifying internal threads whose quality characteristics are less than or equal to a preset quality threshold as the low-quality internal thread.

5. The tapping method for high-voltage switch circumferential parts as described in claim 1, characterized in that, The process of obtaining the cutting parameter deviation feature includes: Determine the number of abnormal index moments, wherein the abnormal index moments are the moments when the parameter values ​​of the tapping cutting parameters at each moment exceed the preset standard parameter range; Determine the extent to which the parameter values ​​of each indicator exceed the preset standard parameter range at abnormal times; The cutting parameter deviation characteristics are obtained based on the number of abnormal moments of the indicators, the degree of excess of each abnormal moment of the indicators, and the range of the tapping cutting parameters; the cutting parameter deviation characteristics are positively correlated with the number of abnormal moments of the indicators, the degree of excess of each abnormal moment of the indicators, and the range.

6. The tapping method for circumferential parts of high-voltage switches as described in claim 1, characterized in that, After obtaining the cutting parameter deviation characteristics of the low-quality internal thread, the tapping method for the high-voltage switch circumferential parts further includes: Determine the degree of difference in tapping cutting parameters between the low-quality internal thread and each other low-quality internal thread; Based on the degree of difference, the deviation characteristics of the cutting parameters of the low-quality internal thread are positively corrected.

7. The tapping method for high-voltage switch circumferential parts as described in claim 1, characterized in that, The process of determining the target low-quality internal thread includes: Low-quality internal threads whose cutting parameters deviate from the characteristic feature by a factor greater than or equal to a preset parameter deviation characteristic threshold are identified as the target low-quality internal threads.

8. The tapping method for high-voltage switch circumferential parts as described in claim 1, characterized in that, The process of obtaining the degree of correlation includes: The overall quality characteristics are obtained from the quality characteristics of each target low-quality internal thread, and the overall cutting parameter deviation characteristics are obtained from the cutting parameter deviation characteristics of each target low-quality internal thread; The degree of correlation is obtained based on the overall quality characteristics and the overall deviation of cutting parameters from the overall characteristics; the degree of correlation is inversely correlated with the overall quality characteristics and positively correlated with the overall deviation of cutting parameters from the overall characteristics.

9. The tapping method for high-voltage switch circumferential parts as described in claim 5, characterized in that, The step of updating the tapping cutting parameters based on the correlation includes: Based on the degree of correlation, the influence weights of the tapping cutting parameters are obtained; Based on the correlation degree and influence weight, adjustment coefficients for tapping cutting parameters are obtained; the adjustment coefficients are positively correlated with both the correlation degree and influence weight. Update the tapping cutting parameters based on the adjustment coefficient and the current preset parameter values ​​of the tapping cutting parameters.

10. The tapping method for high-voltage switch circumferential parts as described in claim 9, characterized in that, The step of updating the tapping cutting parameters based on the adjustment coefficient and the current preset parameter values ​​of the tapping cutting parameters includes: The adjustment amount of the tapping cutting parameters is obtained by multiplying the adjustment coefficient by the current preset parameter value. Calculate the average of the parameter differences between the parameter values ​​at abnormal times of each indicator and the current preset parameter values; When the average value of the parameter difference is greater than 0, the difference between the current preset parameter value and the adjustment amount of the tapping cutting parameter is used as the updated tapping cutting parameter; When the average value of the parameter difference is less than 0, the sum of the current preset parameter value and the adjustment amount of the tapping cutting parameter is used as the updated tapping cutting parameter.

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