Drawing roundness control method for tinned copper wire production

Abstract

The application is suitable for the technical field of tinned copper wire production, and particularly relates to a drawing roundness regulation method for tinned copper wire production, which comprises the following steps: acquiring drawing characteristic information and drawing speed information in real time during the drawing process; determining oscillation condition change characteristics and friction state trend characteristics based on the drawing characteristic information; wherein the oscillation condition change characteristics are used for reflecting the change trend of the degree of chatter caused by friction of the copper wire in the drawing process, and the friction state trend characteristics are used for reflecting the change trend of the friction state between the copper wire and the drawing die in the drawing process tending to be deteriorated; determining a drawing control strategy based on the oscillation condition change characteristics, the friction state trend characteristics and the drawing speed information; wherein the drawing control strategy is used for reflecting the adjustment of the drawing speed information. The drawing roundness regulation method for tinned copper wire production can improve the roundness of the copper wire in the drawing process.

Description

Technical Field

[0001] This application belongs to the field of tin-plated copper wire production technology, and particularly relates to a method for controlling the roundness of drawn copper wire in tin-plated copper wire production. Background Technology

[0002] In the fields of electronic components, precision connectors and semiconductor packaging, tin-plated copper wire is a core conductive material, and the roundness of its cross-section is a key indicator that determines the stability and reliability of the product's electrical performance.

[0003] In related technologies, the stability of the process is typically assessed by monitoring fluctuations in macroscopic parameters such as average tension during the wire drawing process. When macroscopic drawing parameters deviate from the set values, macroscopic measures such as adjusting the tension and drawing speed are taken by the control system to restore stability to the drawing process. However, in this process, when deviations from the set values ​​are detected, they have already affected the copper wire, leading to a decrease in its roundness. Even when the macroscopic drawing process parameters remain stable and the die is in normal condition, there are still obvious periodic slight fluctuations during the drawing process. The accumulation of these fluctuations gradually affects the roundness of the copper wire. In other words, adjusting macroscopic drawing parameters in existing technologies still leads to a decrease in the roundness of the copper wire. Summary of the Invention

[0004] This application provides a method for controlling the roundness of drawn copper wire in the production of tin-plated copper wire, which can improve the problem that adjusting macroscopic drawing parameters still leads to unqualified roundness of copper wire during the drawing process.

[0005] In a first aspect, embodiments of this application provide a method for controlling the roundness of drawn copper wire in tin-plated wire production, including: Real-time acquisition of drawing characteristic information and drawing speed information during the drawing process; wherein, the drawing characteristic information includes first characteristic information reflecting the drawing force electrical signal during the drawing process and second characteristic information reflecting the acoustic emission electrical signal during the drawing process, and the drawing speed information is used to reflect the pre-set drawing speed for drawing tin-plated copper wire; Based on the drawing characteristic information, the oscillation condition change characteristics and friction state trend characteristics are determined; wherein, the oscillation condition change is used to reflect the change trend of the degree of chatter caused by friction during the drawing process of copper wire, and the friction state trend characteristics are used to reflect the change trend of the friction state between copper wire and drawing die tending to deteriorate during the drawing process. Based on the oscillation condition change characteristics, the friction state trend characteristics, and the drawing speed information, a drawing control strategy is determined; wherein, the drawing control strategy is used to reflect adjustments to the drawing speed information.

[0006] The technical solutions described in this application embodiment have at least the following technical effects: The method for controlling the roundness of tin-plated copper wire production provided in this application first acquires, in real time, first characteristic information reflecting the drawing force electrical signal during the drawing process and second characteristic information reflecting the acoustic emission electrical signal during the drawing process, as well as drawing speed information reflecting the pre-set drawing speed for tin-plated copper wire. Then, based on the drawing characteristic information, it determines the oscillation state change characteristics reflecting the changing trend of the chatter degree caused by friction during the drawing process and the friction state trend characteristics reflecting the deteriorating trend of the friction state between the copper wire and the drawing die during the drawing process. Finally, based on the oscillation state change characteristics, the friction state trend characteristics, and the drawing speed information, it determines a drawing control strategy to adjust the drawing speed information.

[0007] This method effectively reduces mis-control problems caused by single signal fluctuations by comparing the first characteristic information of the drawing force electrical signal and the second characteristic information of the acoustic emission electrical signal. Furthermore, by combining the oscillation change characteristics and friction trend characteristics with the current drawing speed information, it comprehensively determines whether the current drawing speed is the dominant factor causing the deterioration of copper wire roundness. Based on the determination result, it directly outputs the corresponding speed adjustment strategy, which directly and accurately locks the direction of drawing speed control that originally required multiple rounds of trial and error to determine, significantly improving control efficiency. Since it directly adjusts the key process parameter of drawing speed, the output drawing control strategy can truly reflect the actual needs of the current drawing process, effectively reducing the problem of decreased copper wire roundness that is easily caused by traditional control methods that only adjust macroscopic drawing process parameters. It controls the control error of drawing speed within a more precise range and improves the roundness of copper wire in the copper wire drawing process.

[0008] Secondly, embodiments of this application provide a drawing roundness control system for tin-plated copper wire production, comprising: A drawing process unit is used to acquire drawing characteristic information and drawing speed information in real time during the drawing process; wherein, the drawing characteristic information includes first characteristic information reflecting the drawing force electrical signal during the drawing process and second characteristic information reflecting the acoustic emission electrical signal during the drawing process, and the drawing speed information is used to reflect the pre-set drawing speed for drawing tin-plated copper wire. The state analysis unit is used to determine the oscillation state change characteristics and friction state trend characteristics based on the drawing characteristic information; wherein, the oscillation state change is used to reflect the change trend of the degree of chatter caused by friction during the drawing process of copper wire, and the friction state trend characteristics are used to reflect the change trend of the friction state between copper wire and drawing die tending to deteriorate during the drawing process. The strategy adjustment unit is used to determine a drawing control strategy based on the oscillation condition change characteristics, the friction state trend characteristics, and the drawing speed information; wherein the drawing control strategy is used to reflect the adjustment of the drawing speed information.

[0009] Thirdly, embodiments of this application provide a drawing roundness control device for tin-plated copper wire production. The drawing roundness control device for tin-plated copper wire production includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, it implements the method described in any of the first aspects above.

[0010] Fourthly, embodiments of this application provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method described in any of the first aspects above.

[0011] Fifthly, embodiments of this application provide a computer program that, when running on a drawing roundness control device for tin-plated copper wire production, causes the drawing roundness control device for tin-plated copper wire production to execute the drawing roundness control method for tin-plated copper wire production described in any of the first aspects above.

[0012] It is understood that the beneficial effects of the second to fifth aspects mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic flowchart of a method for controlling the roundness of drawn copper wire in the production of tin-plated copper wire according to an embodiment of this application; Figure 2 This is a schematic diagram illustrating the implementation process of a method for controlling the roundness of drawn copper wire in the production of tin-plated copper wire according to an embodiment of this application. Figure 3 This is a schematic diagram of the structure of a drawing roundness control system for tin-plated copper wire production according to an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a drawing roundness control device for tin-plated copper wire production provided in one embodiment of this application. Detailed Implementation

[0015] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0016] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description of this application is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are merely some, not all, embodiments of this application, and are used to explain this application, not to limit it. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0017] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes and to distinguish descriptions only, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein.

[0018] In related technologies, the stability of the process is typically determined qualitatively by monitoring fluctuations in macroscopic parameters such as average tension during the wire drawing process. When macroscopic drawing parameters deviate from the set values, macroscopic measures such as adjusting the tension and drawing speed are taken by the control system to restore stability to the drawing process. However, in this process, when deviations from the set values ​​are detected, they have already affected the copper wire, leading to a decrease in its roundness. Even when the macroscopic drawing process parameters remain stable and the die is in normal condition, there are obvious periodic slight fluctuations during the drawing process. The accumulation of these fluctuations gradually affects the roundness of the copper wire. In other words, adjusting macroscopic drawing parameters in existing technologies still leads to a decrease in the roundness of the copper wire.

[0019] To address the aforementioned problems, this application provides a method for controlling the roundness of drawn copper wire in tin-plated production. This method first acquires, in real-time, first characteristic information reflecting the drawing force electrical signal during the drawing process, and second characteristic information reflecting the acoustic emission electrical signal during the drawing process, as well as drawing speed information reflecting a pre-set drawing speed for the tin-plated copper wire. Then, based on the drawing characteristic information, it determines oscillation state change characteristics reflecting the changing trend of chatter caused by friction during the drawing process, and friction state trend characteristics reflecting the deteriorating trend of the friction state between the copper wire and the drawing die during the drawing process. Finally, based on the oscillation state change characteristics, friction state trend characteristics, and drawing speed information, it determines a drawing control strategy to adjust the drawing speed information. This method effectively reduces mis-control problems caused by single signal fluctuations by comparing the first characteristic information of the drawing force electrical signal and the second characteristic information of the acoustic emission electrical signal. Furthermore, by combining the oscillation change characteristics and friction trend characteristics with the current drawing speed information, it comprehensively determines whether the current drawing speed is the dominant factor causing the deterioration of copper wire roundness. Based on the determination result, it directly outputs the corresponding speed adjustment strategy, which directly and accurately locks the direction of drawing speed control that originally required multiple rounds of trial and error to determine, significantly improving control efficiency. Since it directly adjusts the key process parameter of drawing speed, the output drawing control strategy can truly reflect the actual needs of the current drawing process, effectively reducing the problem of decreased copper wire roundness that is easily caused by traditional control methods that only adjust macroscopic drawing process parameters. It controls the control error of drawing speed within a more precise range and improves the roundness of copper wire in the copper wire drawing process.

[0020] The method for controlling the roundness of tin-plated copper wire production provided in this application embodiment can be applied to the equipment for controlling the roundness of tin-plated copper wire production. In this case, the equipment for controlling the roundness of tin-plated copper wire production is the executing entity of the method for controlling the roundness of tin-plated copper wire production provided in this application embodiment. This application embodiment does not impose any restrictions on the specific type of equipment for controlling the roundness of tin-plated copper wire production.

[0021] The drawing roundness control equipment used in the production of tin-plated copper wire can be terminal devices, tablet computers, laptops, ultra-mobile personal computers (UMPCs), netbooks, smart screens, smart TVs, handheld devices with wireless communication functions, desktop computers, handheld devices with wireless communication functions, computers, laptops, handheld computing devices, etc.

[0022] To better understand the method for controlling the roundness of drawn copper wire in the production of tin-plated copper wire provided in the embodiments of this application, the specific implementation process of the method for controlling the roundness of drawn copper wire in the production of tin-plated copper wire provided in the embodiments of this application will be described by way of example below.

[0023] Figure 1 and Figure 2 A schematic flowchart illustrating the method for controlling the roundness of drawn copper wire in production according to an embodiment of this application is shown. Please refer to [link / reference]. Figure 1 and Figure 2 Methods for controlling the roundness of drawn wire in tin-plated copper wire production include: S100, real-time acquisition of drawing characteristic information and drawing speed information during the drawing process; wherein, the drawing characteristic information includes first characteristic information reflecting the drawing force electrical signal during the drawing process and second characteristic information reflecting the acoustic emission electrical signal during the drawing process, and the drawing speed information is used to reflect the pre-set drawing speed for drawing tin-plated copper wire.

[0024] It can be understood that drawing characteristic information is a set of electrical signals reflecting the drawing state, collected in real time by various types of sensors installed on the drawing equipment during the tin-plated copper wire drawing process. The first characteristic information refers to the electrical signal output by the drawing force sensor. This signal is proportional to the drawing force borne by the copper wire during the drawing process and can reflect the instantaneous changes in the drawing load in real time. The second characteristic information refers to the high-frequency electrical signal output by the acoustic emission sensor. Acoustic emission is the elastic wave released by a material during deformation or fracture. During the drawing process, friction between the copper wire and the drawing die, dislocation movement within the copper wire, and the initiation of surface microcracks all generate acoustic emission signals. The intensity, frequency, and waveform characteristics of this signal can reflect the friction state and the degree of material damage. Drawing speed information refers to the copper wire travel speed currently set by the wire drawing equipment control system. Drawing speed information can be manually input or directly obtained from a process database.

[0025] S200, based on the drawing characteristic information, determines the oscillation condition change characteristics and friction state trend characteristics; among them, the oscillation condition change is used to reflect the change trend of the degree of chatter caused by friction during the drawing process of copper wire, and the friction state trend characteristics are used to reflect the change trend of the friction state between copper wire and drawing die during the drawing process tending to deteriorate.

[0026] It is understandable that the oscillation condition change characteristics are used to describe the development trend of chattering during the drawing process of copper wire. Chattering is a self-excited vibration caused by the negative damping characteristic of the friction coefficient during the drawing process, manifested as periodic fluctuations in the drawing force. Severe chattering can lead to periodic ring marks on the surface of the copper wire, seriously affecting the roundness. The friction state trend characteristics are used to describe the evolution trend of the friction state between the copper wire and the die as the drawing process progresses, including the rate of progression of deterioration processes such as increased friction coefficient, lubricant film rupture, or die wear.

[0027] In one possible implementation, in step S200, based on the pull-out characteristic information, the characteristics of oscillation changes and the trend characteristics of friction are determined, including: S210, based on the first characteristic information of the pulling characteristic information, determine the oscillation condition change characteristics.

[0028] It is understandable that the determination of the oscillation characteristics is accomplished through signal processing and analysis of the primary characteristic information. The pull-out force signal contains information of different frequency components. The low-frequency components mainly reflect the average value and slow changing trend of the pull-out force, while the high-frequency components contain information about dynamic instability such as flutter. By performing frequency domain analysis or time-frequency analysis on the pull-out force signal, quantitative indicators reflecting the degree of flutter can be extracted.

[0029] For example, the first feature information can be divided into multiple signal data by the time corresponding to the completion of one full turn of the copper wire on the take-up drum. Then, Fourier processing is performed on each signal data to determine the energy distribution of different frequency components within that signal data. Based on the energy distribution of these components, the oscillation status change can be determined. Alternatively, the first feature information can be time-domain filtered to extract high-frequency fluctuation components, and the root mean square (RMS) value sequence of these components within a sliding time window can be calculated. Linear regression is then performed on the RMS value sequence to obtain its slope trend. The frequency of peak occurrences and the coefficient of variation of amplitude within the statistical window are then analyzed. Finally, the slope, peak frequency, and coefficient of variation are fused according to preset weights to obtain the oscillation status change characteristics.

[0030] In one possible implementation, in step S210, based on the first feature information of the pull-out feature information, the oscillation condition change characteristics are determined, including: S211, the first feature information is divided into multiple first time-domain signal segments based on the wire drawing cycle; wherein, the wire drawing cycle is used to reflect the time corresponding to the copper wire completing a full turn of winding on the take-up drum, and the first time-domain signal segment refers to the signal data after dividing the first feature information according to each wire drawing cycle.

[0031] It can be understood that the drawing cycle is a fixed time length determined by the rotation speed of the take-up drum, during which the copper wire completes one full turn on the drum. Dividing the continuous first characteristic information according to the drawing cycle yields multiple signal segments of equal length, each segment corresponding to the change in drawing force within one drawing cycle. Dividing the second characteristic information by the drawing cycle eliminates periodic interference caused by drum rotation, ensuring that the signal changes within each segment primarily reflect the state changes inherent in the drawing process itself.

[0032] S212, Perform Fourier processing on each first time-domain signal segment to determine the power density sequence; wherein, the power density sequence is used to reflect the energy distribution of different frequency components in the first time-domain signal segment.

[0033] Fourier processing can be understood as performing a Fast Fourier Transform (FFT) on each time-domain signal segment to convert the time-domain signal into a frequency-domain signal, and then calculating the power density of each frequency component. The power density sequence is a spectral distribution curve with frequency on the x-axis and power density value on the y-axis. The power density sequence reveals the energy distribution of the drawing force signal at different frequencies within a drawing cycle. It allows for the specific identification of which frequency components primarily contain the energy corresponding to the drawing force.

[0034] S213, based on each power density sequence, determines the changes in oscillation conditions.

[0035] It can be understood that the change in oscillation status is obtained by extracting features from the power density sequence corresponding to each drawing cycle and arranging the feature values ​​in chronological order. Since each power density sequence reflects the frequency domain energy distribution within that drawing cycle, the evolution of the oscillation state over time can be tracked by analyzing the energy changes near the flutter characteristic frequency.

[0036] For example, the sum of the energies of the frequency components within the preset flutter frequency band in the i-th power density sequence and the sum of the energies of all frequency components after removing the DC component can be determined using the i-th power density sequence. The relative proportion between these two energies is then analyzed and used as the oscillation status change. Alternatively, the oscillation status change can be obtained through a learning model. Each power density sequence is input into the learning model, which then outputs the corresponding oscillation status change. The training process of the learning model involves using the processed data of each power density sequence and its corresponding oscillation status change as the training dataset. This training dataset is then input into the learning model for training, ultimately resulting in the learned model.

[0037] This setup, by segmenting the drawing force signal using the drawing cycle as the basic analysis unit, allows subsequent frequency analysis and feature extraction to be performed on the same time scale, facilitating horizontal comparisons and trend analysis between different cycles. The time-domain signal is converted to a frequency-domain representation using Fourier transform, enabling the independent quantification of the energy of different frequency components. By extracting frequency-domain features according to the drawing cycle and tracking their changes over time, the oscillation changes are visually presented as trend curves, showcasing the dynamic evolution of the drawing process's stability.

[0038] In one possible implementation, in step S213, determining the change in oscillation condition based on each power density sequence includes: S2131, Based on the i-th power density sequence, determine the flutter band energy value and the total energy value of the full band of the i-th power density sequence; wherein, the flutter band energy value is used to reflect the sum of the energy of the frequency components in the power density sequence that are located within the preset flutter band, and the total energy value of the full band is used to reflect the sum of the energy of all frequency components in the power density sequence after removing the DC component.

[0039] It can be understood that the preset flutter frequency band refers to the frequency range in which flutter mainly occurs, which is predetermined based on experimental experience and the dynamic characteristics of the drawing system. The flutter frequency band energy value is the sum of energy obtained by integrating or summing the power densities of all frequency points in the power density sequence that fall within this frequency range.

[0040] For example, flutter frequency bands can be manually input or obtained directly from a frequency database. A frequency database is a database containing different flutter frequency bands. This data can be obtained through laboratory experiments, field measurements and monitoring, and past experience. After acquisition, the collected data is organized, classified, and archived, useful information and patterns are extracted, and the relevant data is saved into the database to form a frequency database.

[0041] S2132, based on the flutter frequency band energy value and the total energy value of the entire frequency band, determine the relative proportion of energy; wherein, the relative proportion of energy is used to reflect the ratio between the flutter frequency band energy value and the total energy value of the entire frequency band.

[0042] The relative energy proportion is a dimensionless ratio obtained by dividing the energy value of the flutter frequency band by the total energy value of the entire frequency band. The relative energy proportion eliminates the influence of overall amplitude fluctuations in the drawing force signal on flutter judgment, allowing for comparison of flutter levels between different drawing cycles on a unified scale. A higher relative energy proportion indicates a higher proportion of flutter components in the drawing force signal, and more severe system oscillations. That is, relative energy proportion = flutter frequency band energy value ÷ total energy value of the entire frequency band.

[0043] S2133, the change in the relative proportion determined by each energy relative proportion is identified as the change in oscillation state.

[0044] It can be understood that arranging the relative proportions of energy calculated from multiple consecutive drawing cycles in chronological order forms a sequence that represents the changes in oscillation. This sequence reflects the evolution of flutter during the drawing process. An upward sequence indicates that flutter is intensifying, a downward sequence indicates that flutter is weakening, and a stable sequence indicates that the drawing process is in a stable state.

[0045] This setup quantifies the magnitude of the oscillation energy and its relative proportion within the total energy by calculating the flutter frequency band energy and the total energy across the entire frequency band separately. By calculating the relative energy proportion, the flutter intensity is normalized into a stable dimensionless index, reducing the interference of fluctuations in the absolute value of the drawing force on flutter judgment. By organizing the relative energy proportions across multiple cycles into a changing sequence, a complete historical trajectory of the evolution of the friction state during wire drawing is provided.

[0046] S220, based on the second feature information of the pull-out feature information, determines the trend characteristics of the friction state.

[0047] It is understandable that acoustic emission signals are highly sensitive to changes in friction conditions. When the lubrication between the copper wire and the mold deteriorates, the coefficient of friction increases, or adhesion occurs on the mold surface, the intensity and spectral characteristics of the acoustic emission signal will change significantly. By performing energy analysis and frequency band energy analysis on the acoustic emission signal, quantitative indicators reflecting the friction condition and its changing trends can be extracted.

[0048] For example, the signal sequence corresponding to each drawing cycle, reflecting the filtered second feature information, can be determined using the drawing cycle and the second feature information. Then, the friction state trend feature can be determined based on each filtered signal sequence reflecting the second feature information. Alternatively, continuous wavelet transform can be performed on the second feature information to extract the characteristic frequency band related to mold friction in the time spectrum. The moving average slope of the energy of this frequency band over time can be calculated, and the count rate and growth rate of acoustic emission events per unit time can be statistically analyzed. The frequency band energy slope and count rate growth rate are then normalized and weighted according to preset weights and fused to obtain the friction state trend feature.

[0049] In one possible implementation, in step S220, based on the second feature information of the pull-out feature information, the friction state trend characteristics are determined, including: S221, Based on the second feature information and the drawing cycle, determine the filtered signal sequence corresponding to each drawing cycle; wherein, the filtered signal sequence is used to reflect the signal sequence obtained after filtering the second feature information.

[0050] It is understandable that acoustic emission signals contain a large amount of noise and irrelevant information. Filtering is used to extract the frequency components most relevant to changes in friction state from the original acoustic emission signal, while filtering out environmental noise and electrical interference. The filtered signal sequence corresponding to each drawing cycle is a time series obtained by processing the acoustic emission signal within that cycle through a bandpass filter or wavelet filter. The filtered signal removes irrelevant frequency components and retains the signal components sensitive to friction state.

[0051] For example, the second feature information can be divided according to the wire drawing cycle. Then, based on the divided signal data, a subset of signal energy distribution in multiple different frequency ranges after time-frequency transformation processing is determined for each signal data. Finally, based on the inclusion analysis of the signal energy distribution subset corresponding to each signal data, the average signal component reflecting the cumulative analysis of multiple frequency band signal components and the change of the average signal component are determined. Then, based on the change of the average signal component, the filtered signal sequence is determined from multiple average signal components. Alternatively, feature frequency band signals related to mold friction excitation can be extracted from the second feature information. Then, Hilbert transform is performed on the frequency band signals to obtain their envelope. After segmenting the envelope according to the wire drawing cycle, the mean and standard deviation of the envelope of each segment are calculated. Segments with a mean exceeding a preset threshold are marked as valid signal segments. Finally, the envelope mean sequence of all valid signal segments in each cycle is selected as the filtered signal sequence.

[0052] In one possible implementation, in step S221, based on the second feature information and the drawing cycle, the filtered signal sequence corresponding to each drawing cycle is determined, including: S2211, the second feature information is divided into multiple second time-domain signal segments based on the wire drawing cycle; wherein, the second time-domain signal segment refers to the signal data after the second feature information is divided according to each wire drawing cycle.

[0053] It is understandable that the method for obtaining the second time-domain signal segment can be obtained in the same way as obtaining the first time-series signal segment in step S211, and will not be elaborated here.

[0054] S2212, based on each second time-domain signal segment, determine multiple frequency band signal components; wherein, the frequency band signal components are used to reflect the signal energy distribution subset in multiple different frequency ranges after time-frequency transformation processing of each second time-domain signal segment.

[0055] It can be understood that time-frequency transformation processing refers to performing a short-time Fourier transform on the second time-domain signal segment, decomposing the signal into multiple different frequency ranges. Each frequency band signal component corresponds to a specific frequency range, containing the signal components within that range. Through this short-time Fourier transform decomposition, the original acoustic emission signal is divided into several narrowband signals, each carrying information within a specific frequency range, and acoustic emission signals at different frequencies correspond to different physical mechanisms.

[0056] S2213, based on the inclusion analysis of multiple frequency band signal components, determine multiple inclusion signal sequences and corresponding inclusion signal sequence changes; wherein, the inclusion signal sequence is used to reflect the average signal component after the inclusion cumulative analysis of multiple frequency band signal components, and the inclusion signal sequence change is used to reflect the change status of the inclusion signal sequence.

[0057] Encompass analysis can be understood as a process of progressively accumulating and statistically analyzing signal components across multiple frequency bands. Starting from the lowest frequency band, it progressively accumulates and averages the signal components of adjacent frequency bands, forming a series of accumulated signal sequences encompassing the range from low frequencies to the current frequency band. The first encompassing signal sequence contains information about the first frequency band component, the second encompassing signal sequence contains information about both the first and second frequency band components, and so on. For each encompassing signal sequence, its root mean square value is calculated, and the changes in these statistical characteristics as the encompassing range increases are examined; this is the variation of the encompassing signal sequence.

[0058] S2214, Based on the changes in each included signal sequence, determine the filtered signal sequence from the corresponding included sequence number.

[0059] It is understandable that inflection points or abrupt changes on the curves corresponding to changes in a signal sequence indicate the frequency band boundaries where energy distribution changes significantly. If the energy is mainly concentrated within a specific frequency band, then frequency components outside that range can be considered noise and filtered out.

[0060] This configuration, by segmenting the acoustic emission signal using the drawing cycle as the basic unit, ensures that each segment has a uniform time length, providing foundational data for subsequent frequency band analysis and feature extraction. Decomposing the broadband acoustic emission signal into multiple narrow-band components helps extract specific frequency band information most relevant to changes in friction state. Encapsulation analysis reveals the cumulative distribution characteristics of acoustic emission energy along the frequency axis, enabling the determination of the frequency band range carrying the main friction state information from multiple frequency energies. Adaptively determining the filtering frequency band range through encapsulation analysis ensures that the filtered signal retains friction state-related information to the maximum extent.

[0061] S222, based on each filtered signal sequence, determines the trend characteristics of the friction state.

[0062] It can be understood that the trend characteristics of the friction state are obtained by statistically analyzing the filtered signal sequence corresponding to each drawing cycle and arranging the analysis results in chronological order. When friction intensifies, the intensity of the acoustic emission signal increases; when friction improves, the signal intensity decreases. The changing trend of the statistical characteristics of the filtered signal sequence over time also reflects the evolution trend of the friction state.

[0063] For example, the energy value of each signal component after encapsulation analysis of the filtered signal sequence can be determined, and the energy change trend of each signal component can be used as a friction state trend feature. Alternatively, each filtered signal sequence can be input into a learning model, and the learning model can output the corresponding friction state trend feature.

[0064] This setup effectively removes noise interference and improves the signal-to-noise ratio of subsequent feature extraction by extracting frequency components highly correlated with changes in friction state from the broadband raw acoustic emission signal through filtering.

[0065] In one possible implementation, in step S222, determining the friction state trend characteristics based on each filtered signal sequence includes: S2221, Based on each second time-domain signal segment of the filtered signal sequence, determine the signal energy value corresponding to each second time-domain signal segment; wherein, the signal energy value is used to reflect the energy value of each second time-domain signal segment.

[0066] It can be understood that the signal energy value is a total measure of the signal intensity in each second time-domain signal segment, usually obtained by summing the squares of the amplitudes at each sampling point in the filtered signal sequence. The energy value is directly related to the severity of the friction; the more intense the friction, the higher the released acoustic emission energy.

[0067] S2222, the energy change trend determined by each signal energy value is used as the friction state trend feature.

[0068] It can be understood that arranging the signal energy values ​​calculated from multiple consecutive drawing cycles in chronological order forms a sequence that represents the energy change trend. This trend reflects the evolution of acoustic emission energy as the drawing process progresses. An upward trend indicates that the friction condition is deteriorating, a downward trend indicates that the friction condition is improving, and a stable trend indicates that the drawing process is in a normal state.

[0069] This setup, by calculating the energy value of the filtered acoustic emission signal within each drawing cycle, condenses the complex filtered signal waveform into a single energy index, providing analytical data for subsequent trend analysis. Organizing the signal energy values ​​into a time series to represent energy change trends not only provides a snapshot of the current friction state but also fully presents the evolutionary trajectory of friction deterioration or improvement.

[0070] S300 determines the drawing control strategy based on the oscillation condition change characteristics, friction state trend characteristics, and drawing speed information; wherein, the drawing control strategy is used to reflect the adjustment of the drawing speed information.

[0071] It can be understood that the drawing control strategy is a specific plan for adjusting the drawing speed based on the current state and development trend of the oscillation characteristics and friction characteristics, combined with the current drawing speed information. The core objective of this strategy is to suppress chatter, reduce frictional heat, and reduce die wear by reducing the drawing speed when the wire drawing process is intensifying or the friction condition is deteriorating, thereby maintaining the roundness of the copper wire. Conversely, when the wire drawing process is stable, the drawing speed can be appropriately increased to improve production efficiency.

[0072] For example, the real-time friction state between the copper wire and the drawing die during the wire drawing process can be determined by the oscillation state change characteristics and friction state trend characteristics. Then, based on the real-time friction state and drawing speed information, a drawing control strategy can be determined. Alternatively, the oscillation state change characteristics, friction state trend characteristics, and drawing speed information can be input into a learning model, and the learning model can output the corresponding drawing control strategy, etc., but not limited to these.

[0073] This setup, by comparing the first characteristic information of the drawing force electrical signal with the second characteristic information of the acoustic emission electrical signal, can effectively reduce the problem of mis-control caused by single signal fluctuations. Furthermore, by combining the oscillation change characteristics and friction trend characteristics with the current drawing speed information, it can comprehensively determine whether the current drawing speed is the dominant factor causing the deterioration of copper wire roundness. Based on the determination result, the corresponding speed adjustment strategy is directly output, which can precisely lock the direction of drawing speed control that originally required multiple rounds of trial and error to determine, significantly improving the control efficiency. Since the adjustment is directly targeted at the key process parameter of drawing speed, the output drawing control strategy can truly reflect the actual needs of the current drawing process, effectively reducing the problem of decreased copper wire roundness that is easily caused by traditional control by adjusting only macroscopic drawing process parameters. It controls the control error of drawing speed within a more precise range and improves the roundness of copper wire in the copper wire drawing process.

[0074] In one possible implementation, in step S300, a drawing control strategy is determined based on the oscillation condition change characteristics, friction state trend characteristics, and drawing speed information, including: S310, based on the oscillation condition change characteristics and friction state trend characteristics, determines the speed adjustment decision value; wherein, the speed adjustment decision value is used to reflect the real-time friction state between the copper wire and the drawing die during the wire drawing process.

[0075] It can be understood that the speed adjustment decision value is a comprehensive decision variable calculated by integrating the characteristics of oscillation changes and the trend characteristics of friction. This decision value integrates characteristic information from two different physical sources into a unified numerical value to characterize the overall risk level of the current pulling state. The higher the speed adjustment decision value, the more unstable the pulling process is, and the more necessary it is to reduce the pulling speed for intervention and adjustment. The lower the speed adjustment decision value, the more stable the pulling process is, and the pulling speed can be maintained or increased.

[0076] For example, the degree of oscillation of the copper wire during the drawing process can be determined by the oscillation condition change characteristics, and the degree of friction deterioration between the copper wire and the drawing die and the time point corresponding to the change of the warning characteristic value can be determined by the friction state trend characteristics. Based on the time point, the weight coefficients for the force signal confidence and the warning characteristic value are determined. Then, the speed adjustment decision value is determined according to the corresponding weights and the degree of oscillation of the copper wire and the degree of friction deterioration between the copper wire and the drawing die during the drawing process. Alternatively, the oscillation condition change characteristics and the friction state trend characteristics can be normalized to the same dimension, and their weighted geometric mean can be calculated. It should be noted that the weights are dynamically adjusted according to the cumulative running time of the current drawing cycle. The longer the running time, the greater the weight of the friction trend characteristics. The speed adjustment decision value is then obtained by multiplying the weighted geometric mean by a preset benchmark speed adjustment factor.

[0077] In one possible implementation, step S310 involves determining a speed adjustment decision value based on the oscillation condition change characteristics and friction state trend characteristics, including: S311, based on the characteristics of oscillation changes, determine the confidence level of the force signal; whereby the confidence level of the force signal is used to reflect the degree of oscillation of the copper wire during the wire drawing process.

[0078] It is understandable that a higher force signal confidence score indicates a higher degree of oscillation and a more reliable reflection of the unstable state. The force signal confidence score can be determined by the ratio of the average oscillation characteristics between the oscillation characteristics corresponding to the current drawing cycle and the oscillation characteristics corresponding to past drawing cycles.

[0079] S312, based on the trend characteristics of friction state, determine the warning characteristic value and the warning trigger time; wherein, the warning characteristic value is used to reflect the degree of friction deterioration between the copper wire and the drawing die during the wire drawing process, and the warning trigger time is used to reflect the time point corresponding to the change of the warning characteristic value.

[0080] It is understandable that the warning characteristic value can be determined by the ratio of the average friction state trend characteristic between the current drawing cycle and the past drawing cycles. The warning trigger time refers to the point in time when the warning characteristic value first changes, reflecting the time when friction degradation begins.

[0081] S313, Based on the warning trigger time, determine the first fusion weight and the second fusion weight; wherein, the first fusion weight is used to reflect the weight coefficient occupied by the confidence of the force signal, and the second fusion weight is used to reflect the weight coefficient occupied by the warning feature value.

[0082] It is understandable that the determination of the first and second fusion weights depends on the relative freshness of the warning trigger time. If the warning trigger time is relatively close to the current time, the friction state information should be given a higher weight; if the warning trigger time is relatively far from the current time, the oscillation state information should be given a higher weight, because continuous degradation may have already caused dynamic instability problems such as flutter.

[0083] S314. The speed adjustment decision value is determined by weighting and summing the first fusion weight, the force signal confidence, the early warning feature value, and the second fusion weight.

[0084] It can be understood that the speed adjustment decision value = first fusion weight × force signal confidence + second fusion weight × early warning feature value This setup, by determining the warning characteristic value and the warning trigger time, not only quantifies the severity of the current friction degradation but also records the time when degradation began. Through weighted summation, a soft fusion of these two types of characteristic information is achieved, ensuring that the speed adjustment decision value continuously reflects the degree of risk numerically, providing a refined decision-making basis for subsequent speed control.

[0085] S320 determines the pulling control strategy based on the speed adjustment decision value and the pulling speed information.

[0086] It is understandable that after obtaining the speed adjustment decision value, a specific speed adjustment plan is determined based on the current pulling speed information. The pulling control strategy decides whether to maintain, increase, or decrease the pulling speed, and the magnitude of the adjustment, based on the magnitude of the speed adjustment decision value. If the speed adjustment decision value is within a safe range, the current speed is maintained; however, if the speed adjustment decision value exceeds a preset warning threshold, the amount of speed reduction required is calculated based on the degree of exceedance.

[0087] For example, the speed adjustment decision value can be matched with a preset threshold range to determine the classification result where the speed adjustment decision value falls within the preset threshold range, and then the speed adjustment strategy corresponding to the threshold range can be executed based on the classification result. Alternatively, the speed adjustment decision value and the pulling speed information can be input into the learning model, and the learning model can output the corresponding pulling control strategy, and so on, but not limited to these.

[0088] This setup, by integrating the two characteristics of oscillation and friction, yields a speed adjustment decision value that reflects the overall stability level of the drawing process. By comparing the speed adjustment decision value with a preset threshold and calculating the speed reduction, a complete closed loop from condition assessment to speed control is achieved. This allows for timely and quantitative speed reduction to protect the roundness of the copper wire when chatter or friction deterioration occurs.

[0089] In one possible implementation, in step S320, a drawing control strategy is determined based on the speed adjustment decision value and the drawing speed information, including: S321, Based on the speed adjustment decision value and the preset threshold range, a matching judgment is made to determine multiple judgment results; wherein, the judgment result is used to reflect the classification result that the speed adjustment decision value falls into the preset threshold range.

[0090] It can be understood that the preset threshold range is a pre-set set of segmented intervals that divide the range of speed adjustment decision values ​​into multiple regions, with each interval corresponding to a different control behavior.

[0091] For example, three intervals can be set: dead zone (0-0.3), warning zone (0.3-0.6), and danger zone (0.6-1.0). The determination result is to compare the currently calculated speed adjustment decision value with these intervals to determine its category.

[0092] S322, when the judgment result reflects that the speed adjustment decision value is within the preset dead zone range, determine to keep the current pulling speed unchanged.

[0093] It is understandable that the speed adjustment decision value within the dead zone corresponds to a stable and safe operating state of the drawing process. Within the dead zone, the system does not make any speed adjustments, maintaining the current drawing speed unchanged, thereby reducing unnecessary intervention in the stable operating state and improving the stability of the system and the continuity of production.

[0094] S323, when the judgment result reflects that the speed adjustment decision value exceeds the preset uplink trigger threshold, the speed adjustment amount is determined based on the difference between the speed adjustment decision value and the preset uplink trigger threshold.

[0095] It is understandable that when the speed adjustment decision value exceeds the uplink trigger threshold (i.e., the dead zone upper limit, for example, 0.30), it indicates that the pull-out process has entered an unstable region and speed adjustment is required. The magnitude of the speed adjustment depends on the degree to which the speed adjustment decision value exceeds the uplink trigger threshold; the greater the exceedance, the higher the risk, and the greater the speed reduction required.

[0096] This configuration, by setting a dead zone range, reduces false speed adjustments caused by signal noise or minor fluctuations, thus improving the stability of the control system and the continuity of the production process. By calculating the speed adjustment amount based on the difference between the speed adjustment decision value and the threshold, a quantitative mapping between the level of risk and the magnitude of speed reduction is achieved, enabling speed control to effectively cope with high-risk conditions.

[0097] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0098] Corresponding to the above embodiment of the method for controlling the roundness of drawing in the production of tin-plated copper wire, this application embodiment also provides a system for controlling the roundness of drawing in the production of tin-plated copper wire. Each module of the system for controlling the roundness of drawing in the production of tin-plated copper wire can realize each step of the method for controlling the roundness of drawing in the production of tin-plated copper wire. Figure 3 The diagram shows a structural block diagram of a drawing roundness control system for tin-plated copper wire production provided in an embodiment of this application. For ease of explanation, only the parts related to the embodiments of this application are shown.

[0099] Reference Figure 3 The drawing roundness control system for tin-plated copper wire production includes: The drawing process unit is used to acquire drawing characteristic information and drawing speed information in real time during the drawing process; wherein, the drawing characteristic information includes first characteristic information reflecting the drawing force electrical signal during the drawing process and second characteristic information reflecting the acoustic emission electrical signal during the drawing process, and the drawing speed information is used to reflect the pre-set drawing speed for drawing tin-plated copper wire.

[0100] The state analysis unit is used to determine the oscillation state change characteristics and friction state trend characteristics based on the drawing characteristic information. Among them, the oscillation state change is used to reflect the change trend of the chatter degree caused by friction during the drawing process of copper wire, and the friction state trend characteristics are used to reflect the deterioration trend of the friction state between copper wire and drawing die during the drawing process.

[0101] The strategy adjustment unit is used to determine the drawing control strategy based on the oscillation condition change characteristics, friction state trend characteristics, and drawing speed information; wherein, the drawing control strategy is used to reflect the adjustment of the drawing speed information.

[0102] It should be noted that the information interaction and execution process between the above systems / units are based on the same concept as the method embodiments of this application. For details on their specific functions and technical effects, please refer to the method embodiments section, and they will not be repeated here.

[0103] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the system can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments 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. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0104] This application also provides a drawing roundness control device for tin-plated copper wire production. Figure 4 This is a schematic diagram of the structure of a drawing roundness control device 4 for producing tin-plated copper wire according to an embodiment of this application. Figure 4 As shown, the drawing roundness control device 4 for tin-plated copper wire production in this embodiment includes: at least one processor 40 ( Figure 4 Only one is shown in the image), at least one memory 41 ( Figure 4 (Only one is shown in the image) and a computer program 42 stored in the at least one memory 41 and executable on the at least one processor 40. When the processor 40 executes the computer program 42, it causes the tin-plated copper wire production drawing roundness control device 4 to perform the steps in any of the above embodiments of the tin-plated copper wire production drawing roundness control method, or causes the tin-plated copper wire production drawing roundness control device 4 to perform the functions of each module / unit in the above embodiments of the system.

[0105] For example, the computer program 42 may be divided into one or more modules / units, which are stored in the memory 41 and executed by the processor 40 to complete this application. The one or more modules / units may be a series of computer program instruction segments capable of performing specific functions, which describe the execution process of the computer program 42 in the drawing roundness control equipment 4 for tin-plated copper wire production.

[0106] The drawing roundness control device 4 for tin-plated copper wire production can be a desktop computer, laptop, handheld computer, or cloud server, etc. This drawing roundness control device 4 may include, but is not limited to, a processor 40 and a memory 41. Those skilled in the art will understand that... Figure 4 This is merely an example of the drawing roundness control device 4 for tin-plated copper wire production and does not constitute a limitation on the drawing roundness control device 4 for tin-plated copper wire production. It may include more or fewer components than shown in the figure, or combine certain components, or different components, such as input / output devices, network access devices, buses, etc.

[0107] The processor 40 can be a Central Processing Unit (CPU), but it can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0108] In some embodiments, the memory 41 may be an internal storage unit of the drawing roundness control device 4 for tin-plated copper wire production, such as a hard disk or memory of the drawing roundness control device 4. In other embodiments, the memory 41 may be an external storage device of the drawing roundness control device 4 for tin-plated copper wire production, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc., equipped on the drawing roundness control device 4. Further, the memory 41 may include both internal storage units and external storage devices of the drawing roundness control device 4 for tin-plated copper wire production. The memory 41 is used to store operating systems, application programs, bootloaders, data, and other programs, such as the program code of computer programs. The memory 41 can also be used to temporarily store data that has been output or will be output.

[0109] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps in any of the above method embodiments.

[0110] This application provides a computer program product that, when running on a drawing roundness control device for tin-plated copper wire production, enables the drawing roundness control device for tin-plated copper wire production to implement the steps in any of the above-described method embodiments.

[0111] 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, all or part of the processes in the methods of the above embodiments of this application can be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include at least: any entity or device capable of carrying the computer program code to the drawing roundness control equipment for tin-plated copper wire production, a recording medium, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium. Examples include USB flash drives, portable hard drives, magnetic disks, or optical disks.

[0112] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0113] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0114] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A method for controlling the roundness of drawn wire in the production of tin-plated copper wire, characterized in that, include: Real-time acquisition of drawing characteristic information and drawing speed information during the drawing process; wherein, the drawing characteristic information includes first characteristic information reflecting the drawing force electrical signal during the drawing process and second characteristic information reflecting the acoustic emission electrical signal during the drawing process, and the drawing speed information is used to reflect the pre-set drawing speed for drawing tin-plated copper wire; Based on the drawing characteristic information, the oscillation condition change characteristics and friction state trend characteristics are determined; wherein, the oscillation condition change is used to reflect the change trend of the degree of chatter caused by friction during the drawing process of copper wire, and the friction state trend characteristics are used to reflect the change trend of the friction state between copper wire and drawing die tending to deteriorate during the drawing process. Based on the oscillation condition change characteristics, the friction state trend characteristics, and the drawing speed information, a drawing control strategy is determined; wherein, the drawing control strategy is used to reflect adjustments to the drawing speed information.

2. The method for controlling the roundness of drawn wire in the production of tin-plated copper wire as described in claim 1, characterized in that, The determination of oscillation state change characteristics and friction state trend characteristics based on the pull-out characteristic information includes: Based on the first feature information of the pull-out feature information, the oscillation condition change characteristics are determined; Based on the second feature information of the pull-out feature information, the friction state trend feature is determined.

3. The method for controlling the roundness of drawn wire in the production of tin-plated copper wire as described in claim 2, characterized in that, The determination of oscillation condition change characteristics based on the first feature information of the pull-out feature information includes: The first feature information is divided into multiple first time-domain signal segments based on the wire drawing cycle; wherein, the wire drawing cycle is used to reflect the time corresponding to the copper wire completing a full turn of winding on the take-up drum, and the first time-domain signal segment refers to the signal data after dividing the first feature information according to each wire drawing cycle; Fourier processing is performed on each of the first time-domain signal segments to determine the power density sequence; wherein, the power density sequence is used to reflect the energy distribution of different frequency components in the first time-domain signal segment; Based on each of the power density sequences, the characteristics of oscillation changes are determined.

4. The method for controlling the roundness of drawn wire in the production of tin-plated copper wire as described in claim 3, characterized in that, The determination of oscillation condition change characteristics based on each of the power density sequences includes: Based on the i-th power density sequence, the flutter band energy value and the total energy value of the full band of the i-th power density sequence are determined; wherein, the flutter band energy value is used to reflect the sum of the energy of the frequency components in the power density sequence that are located within a preset flutter band, and the total energy value of the full band is used to reflect the sum of the energy of all frequency components in the power density sequence after removing the DC component; Based on the flutter frequency band energy value and the total energy value of the entire frequency band, the relative energy ratio is determined; wherein, the relative energy ratio is used to reflect the ratio between the flutter frequency band energy value and the total energy value of the entire frequency band; The change in the relative proportion determined by each of the aforementioned energy relative proportions is identified as a characteristic of the oscillation state change.

5. The method for controlling the roundness of drawn wire in the production of tin-plated copper wire as described in claim 3, characterized in that, The second feature information based on the pull-out feature information, determining the friction state trend characteristics, includes: Based on the second feature information and the drawing cycle, a filtered signal sequence corresponding to each drawing cycle is determined; wherein, the filtered signal sequence is used to reflect the signal sequence obtained after filtering the second feature information; Based on each of the filtered signal sequences, the trend characteristics of the friction state are determined.

6. The method for controlling the roundness of drawn wire in the production of tin-plated copper wire as described in claim 5, characterized in that, The step of determining the filtered signal sequence corresponding to each drawing cycle based on the second feature information and the drawing cycle includes: The second feature information is divided into multiple second time-domain signal segments based on the drawing cycle; wherein, the second time-domain signal segment refers to the signal data after the second feature information is divided according to each drawing cycle; Based on each of the second time-domain signal segments, multiple frequency band signal components are determined; wherein, the frequency band signal components are used to reflect the signal energy distribution subsets in multiple different frequency ranges after time-frequency transformation processing of each of the second time-domain signal segments; An encapsulation analysis is performed based on multiple frequency band signal components to determine multiple encapsulated signal sequences and corresponding encapsulated signal sequence changes; wherein, the encapsulated signal sequence is used to reflect the average signal component after encapsulation and cumulative analysis of multiple frequency band signal components, and the encapsulated signal sequence changes are used to reflect the changes in the encapsulated signal sequence. Based on each of the included signal sequence changes, a filtered signal sequence is determined from the corresponding included sequence number.

7. The method for controlling the roundness of drawn wire in the production of tin-plated copper wire as described in claim 6, characterized in that, The step of determining the friction state trend characteristics based on each of the filtered signal sequences includes: Based on each second time-domain signal segment of the filtered signal sequence, a signal energy value corresponding to each second time-domain signal segment is determined; wherein, the signal energy value is used to reflect the energy value of each second time-domain signal segment; The energy change trend determined by each of the signal energy values ​​is used as the friction state trend feature.

8. The method for controlling the roundness of drawn wire in the production of tin-plated copper wire as described in claim 1, characterized in that, The step of determining a drawing control strategy based on the oscillation condition change characteristics, the friction state trend characteristics, and the drawing speed information includes: Based on the oscillation change characteristics and the friction trend characteristics, a speed adjustment decision value is determined; wherein, the speed adjustment decision value is used to reflect the real-time friction state between the copper wire and the drawing die during the wire drawing process; Based on the speed adjustment decision value and the pulling speed information, a pulling control strategy is determined.

9. The method for controlling the roundness of drawn wire in the production of tin-plated copper wire as described in claim 8, characterized in that, The process of determining the speed adjustment decision value based on the oscillation condition change characteristics and the friction state trend characteristics includes: Based on the aforementioned oscillation characteristics, the confidence level of the force signal is determined; wherein, the confidence level of the force signal is used to reflect the degree of oscillation of the copper wire during the wire drawing process; Based on the aforementioned friction state trend characteristics, a warning characteristic value and a warning trigger time are determined; wherein, the warning characteristic value is used to reflect the degree of friction deterioration between the copper wire and the drawing die during the wire drawing process, and the warning trigger time is used to reflect the time point corresponding to the change of the warning characteristic value; Based on the warning trigger time, a first fusion weight and a second fusion weight are determined; wherein, the first fusion weight is used to reflect the weight coefficient occupied by the confidence of the force signal, and the second fusion weight is used to reflect the weight coefficient occupied by the warning feature value. The speed adjustment decision value is determined by summing the first fusion weight, the force signal confidence, the early warning feature value, and the second fusion weight.

10. The method for controlling the roundness of drawn wire in the production of tin-plated copper wire as described in claim 8, characterized in that, The step of determining the pulling control strategy based on the speed adjustment decision value and the pulling speed information includes: Based on the speed adjustment decision value and the preset threshold range, a matching judgment is performed to determine multiple judgment results; wherein, the judgment result is used to reflect the classification result of the speed adjustment decision value falling into the preset threshold range; When the determination result reflects that the speed adjustment decision value is within the preset dead zone range, it is determined to keep the current drawing speed unchanged. When the determination result reflects that the speed adjustment decision value exceeds the preset uplink trigger threshold, the speed adjustment amount is determined based on the difference between the speed adjustment decision value and the preset uplink trigger threshold.

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