A precision wire drawing collaborative control system and method based on an ultrafine tungsten wire

Abstract

The application discloses a precision wire drawing collaborative control system and method based on superfine tungsten wire preparation and relates to the technical field of metal wire processing. The end section input data set Inp is collected; the end section state result Sta is generated from the end section input data set Inp; the last three passes of final drawing are subjected to heat history rearrangement according to the end section state result Sta, and short-range tempering treatment is continuously carried out on the basis of the end section heat history result Htp to generate the short-range treatment result Tmp. In this way, the last stage of final drawing no longer adopts a single continuous stretching and single continuous heating treatment mode, but before entering the final setting, the end section state recognition, end section heat input sequence adjustment and end section residual stress treatment are sequentially completed, so that the problems of the increase of the surface layer embrittlement tendency, the increase of the end section wire breaking probability, the instability of the free circle diameter, the increase of the wire diameter fluctuation in the rear section and the difficulty in simultaneously maintaining the final strength and geometric state are controlled in a targeted manner.

Description

Technical Field

[0001] This invention relates to the field of metal wire processing technology, specifically to a precision wire drawing collaborative control system and method based on the preparation of ultra-fine tungsten wire. Background Technology

[0002] As a representative of precision metal wires, ultra-fine tungsten wires have increasingly higher requirements for wire diameter consistency, end-stage forming stability, free state retention, and mechanical property stability in applications such as high-precision cutting, micro-conductive connections, and high-stability wire forming. The development of more refined wire drawing control methods around the ultra-fine tungsten wire preparation process is no longer simply about adjusting the drawing speed, heating temperature, or tension, but is gradually shifting towards a technical direction of synergistic control of the forming state, heat input path, and final shaping quality in the final drawing stage.

[0003] Currently, while the preparation process of ultra-fine tungsten wires has formed a relatively mature segmented drawing, heating regulation, and final drawing forming process route, many processes still follow a relatively simple end-stage treatment approach in the last few passes of final drawing. That is, the final diameter reduction and finishing shaping are completed continuously according to a predetermined heat input method and a predetermined stretching rhythm. This treatment method can maintain the basic forming requirements under conventional wire diameter conditions, but after ultra-fine tungsten wires enter the last three passes of final drawing, the material cross-section has been further reduced, and the coupling effect between the final heat input, stretching path, and residual stress accumulation will be significantly enhanced. If a monotonous heat input and conventional final stretching path are still used, the tendency of surface embrittlement, circumferential residual stress concentration, and final geometric state fluctuation formed in the final stage will be difficult to weaken and rearrange in time, and the final forming process is prone to change from a continuous convergence state to a highly sensitive fluctuation state. Precisely because this stage lacks a coordinated control means for rearranging the internal thermal history and adjusting the final shaping sequence, there is still room for further optimization of the existing process in the final drawing and finishing stage of ultra-fine tungsten wires. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a precision wire drawing collaborative control system and method based on ultra-fine tungsten wire preparation, thus solving the problem.

[0005] This invention is achieved through the following technical solution: a precision wire drawing collaborative control method based on ultra-fine tungsten wire, comprising the following steps:

[0006] S1. Before the ultra-fine tungsten wire enters the last three passes of final drawing, collect the following data corresponding to this stage: end tension change data Ten, end linear velocity change data Vel, pay end winding diameter change data Pay, take-up end winding diameter change data Tak, first temperature zone setting data Tmpa, second temperature zone setting data Tmpb, and end wire diameter change data Dia. Integrate these data to form the end input dataset Inp.

[0007] S2. Identify the current final stretch forming state based on the final stretch input dataset Inp, and generate the final stretch state result Sta.

[0008] S3. Based on the final stage state result Sta, the thermal history of the last three passes of the final pull is rearranged so that the last three passes of the final pull form a low heat input entry section, a controlled micro-increase heat input peak reduction section, and a relatively low heat input steady-state transition section in sequence, which constitutes the final stage thermal history result Htp.

[0009] S4. After the third stage of the thermal process, corresponding to the final stage Htp, and before entering the final shaping stage, the ultrafine tungsten wire is subjected to short-path tempering to reduce the residual stress in the final stage and generate the short-path processing result Tmp.

[0010] Preferably, S1 includes S11;

[0011] S11. Before the ultra-fine tungsten wire enters the last three final drawing stages, read the output content of the detection unit and setting unit corresponding to the final drawing stage in the wire drawing equipment.

[0012] This includes: the tension detection unit reads the tension values ​​of the ultra-fine tungsten wire in the corresponding intervals of the last three passes of final tensioning, and organizes them into the final tension change data Ten according to the order of acquisition;

[0013] The linear velocity detection unit reads the linear velocity values ​​of the ultrafine tungsten wire in the corresponding intervals of the last three final stretches, and organizes them into the final linear velocity change data Vel according to the order of acquisition.

[0014] The wire end diameter detection unit reads the wire end diameter detection value and organizes it into wire end diameter change data Pay according to the order of collection.

[0015] The take-up end winding diameter detection unit reads the winding diameter detection value at the take-up end and organizes it into winding diameter change data Tak in the order of collection.

[0016] The first temperature zone setting unit reads the first temperature zone setting value and organizes it into the first temperature zone setting data Tmpa according to the order of acquisition.

[0017] The second temperature zone setting unit reads the second temperature zone setting value and organizes it into second temperature zone setting data Tmpb according to the order of acquisition.

[0018] The wire diameter detection unit reads the wire diameter detection values ​​of the ultra-fine tungsten wire in the corresponding interval of the last three final drawing passes, and organizes them into the final wire diameter change data Dia according to the order of collection.

[0019] Then, the data read from each unit is integrated to obtain the basic operating data set.

[0020] Preferably, S1 further includes S12;

[0021] S12. Organize the basic operational data group accordingly, the corresponding organization including:

[0022] Extract the pre-set unified acquisition cycle, sort and organize the following data: end tension change data Ten, end linear velocity change data Vel, pay end winding diameter change data Pay, take-up end winding diameter change data Tak, first temperature zone setting data Tmpa, second temperature zone setting data Tmpb, and end wire diameter change data Dia, and assign the corresponding acquisition sequence number to the data position within each unified acquisition cycle.

[0023] Then, using the acquisition sequence number as the unique basis for corresponding data, the final tension change data Ten, the final linear velocity change data Vel, the wire diameter change data Pay, the take-up wire diameter change data Tak, the first temperature zone setting data Tmpa, the second temperature zone setting data Tmpb, and the final wire diameter change data Dia under the same acquisition sequence number are matched accordingly, so that each data forms a set of corresponding data arranged according to the acquisition sequence number in the corresponding interval of the last three passes of the final pull;

[0024] Then, the data from each group are integrated according to the collection sequence number to form the final input dataset Inp.

[0025] Preferably, S2 includes S21;

[0026] S21. Select six consecutive sets of data records with consecutive acquisition sequence numbers from the input dataset Inp at the end of the segment, use them as the data window for the current state recognition, and define the six sets of data records as the state recognition window Win.

[0027] Each set of data records in the status recognition window Win includes the following data under the same acquisition sequence number: end tension change data Ten, end linear velocity change data Vel, pay end winding diameter change data Pay, take-up end winding diameter change data Tak, first temperature zone setting data Tmpa, second temperature zone setting data Tmpb, and end wire diameter change data Dia.

[0028] The data records in the first three zones of the status recognition window Win, arranged in the order of collection sequence number, are used as the first-stage comparison data, and the data records in the last three zones are used as the second-stage comparison data.

[0029] Preferably, S2 further includes S22;

[0030] S22. Determine the status recognition window Win, and the determination rules include:

[0031] When the difference between the maximum and minimum values ​​of the end-segment tension change data Ten in the status recognition window Win is within the preset tension range;

[0032] The difference between the maximum and minimum values ​​of the final segment linear velocity change data Vel is within the preset velocity range;

[0033] The difference between the maximum and minimum values ​​of the final wire diameter variation data Dia is within the preset wire diameter range;

[0034] Furthermore, when the data on the change in the coil diameter at the pay-off end (Pay) decreases sequentially according to the acquisition sequence number, and the data on the change in the coil diameter at the take-up end (Tak) increases sequentially according to the acquisition sequence number, the current final drawing stage forming state is determined to be a stable forming state.

[0035] The average value of the tension change data (Ten) at the end of the current segment in the comparison data is less than the average value of the tension change data (Ten) at the end of the subsequent segment in the comparison data.

[0036] The average value of the linear velocity change data (Vel) in the final segment of the comparison data in the first segment is greater than or equal to the average value of the linear velocity change data (Vel) in the final segment of the comparison data in the second segment.

[0037] Furthermore, if the average decrease in the final section diameter change data Dia in the preceding comparison data is greater than the average decrease in the final section diameter change data Dia in the following comparison data, then the current final stretching final section forming state is determined to be a state of continuous stress accumulation.

[0038] When the direction of change of the final tension data Ten between two adjacent sets of data records in the status recognition window Win changes alternately two or more times;

[0039] If the direction of change of the final segment linear velocity data Vel between two adjacent sets of data records alternates two or more times; and the difference between the maximum and minimum values ​​of the final segment wire diameter change data Dia exceeds the preset wire diameter range, the current final drawing final segment forming state is determined to be a fluctuation amplification state.

[0040] The determined stable forming state, stress accumulation state, or fluctuation amplification state are written into the final state result Sta.

[0041] Preferably, S3 includes S31;

[0042] S31. Read the final state result Sta, and divide the last three passes of the final pull into the first final segment, the second final segment, and the third final segment in sequence.

[0043] The heat input adjustment for the last three passes of the final drawing is achieved by adjusting the temperature zone setting value corresponding to the final stage of the final drawing. The temperature zone setting value includes the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb.

[0044] When the final state result Sta indicates that the current final stretch forming state is a stable forming state, the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the first final stretch are set to the first heat input level.

[0045] Set the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the second end section to the second heat input level;

[0046] Set the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the third end section to the third heat input level;

[0047] Among them, the second heat input level is higher than the first heat input level, and the third heat input level is lower than the second heat input level;

[0048] When the final state result Sta indicates that the current final stretching and forming state is a state of continuous stress accumulation, the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the first final stage are kept at the first heat input level.

[0049] Adjust the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the second end section to the fourth heat input level;

[0050] The first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the third end section are adjusted to the third heat input level, wherein the fourth heat input level is higher than the second heat input level;

[0051] When the final state result Sta indicates that the current final stretch forming state is a fluctuation amplification state, the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the first final stage are kept at the first heat input level; the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the second final stage are adjusted to the fifth heat input level.

[0052] The first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the third end section are adjusted to the third heat input level, wherein the fifth heat input level is higher than the fourth heat input level;

[0053] Record the temperature zone settings corresponding to each terminal segment in the order of the first, second, and third terminal segments to form the terminal segment path result Pat.

[0054] Preferably, S3 further includes S32;

[0055] S32. Based on the final path result Pat, perform temperature zone control on the last three final pulls.

[0056] In the first final segment, according to the temperature zone setting value corresponding to the first final segment in the final segment path result Pat, adjust the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb to make the first final segment a low heat input entry segment.

[0057] In the second final segment, according to the temperature zone setting value corresponding to the second final segment in the final segment path result Pat, adjust the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb to make the second final segment a controlled micro-heat input peak-shaving segment.

[0058] In the third final stage, according to the temperature zone setting value corresponding to the third final stage in the final stage path result Pat, adjust the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb to make the third final stage form a low heat input steady-state transition stage.

[0059] After completing the temperature zone control for the first, second, and third final stages, record the temperature zone adjustment results for the last three final pulls in the execution order to form the final stage thermal history result Htp.

[0060] Preferably, S4 includes S41;

[0061] S41. Read the final thermal history result Htp and determine the running interval between the end position of the third final stage and the start position of the final shaping pass as the short-range tempering processing interval.

[0062] Based on the temperature zone adjustment results corresponding to the third final stage in the final thermal history result Htp, determine the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the short-path tempering treatment interval.

[0063] The first temperature zone setting data Tmpa corresponding to the short-range tempering treatment interval is greater than the first temperature zone setting data Tmpa corresponding to the third end segment, the second temperature zone setting data Tmpb corresponding to the short-range tempering treatment interval is greater than the second temperature zone setting data Tmpb corresponding to the third end segment, and both the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the short-range tempering treatment interval are within the preset recrystallization damage threshold range.

[0064] The first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the short-range tempering treatment interval are integrated with the short-range tempering treatment interval to form the short-range tempering setting result Ann.

[0065] Preferably, S4 further includes S42;

[0066] S42. When the ultrafine tungsten wire reaches the short-range tempering treatment zone, the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb recorded in the short-range tempering setting result Ann are called up and written into the first temperature zone control unit and the second temperature zone control unit respectively, so that the ultrafine tungsten wire completes one continuous heating treatment in the short-range tempering treatment zone.

[0067] A precision wire drawing collaborative control system based on ultra-fine tungsten wire includes a tungsten wire drawing stage data acquisition module, a wire drawing state recognition module, a hot section rearrangement module, and a short-range processing module;

[0068] Before the ultra-fine tungsten wire enters the final three stages of final drawing, the data acquisition module of the tungsten wire drawing stage collects the following data: end tension change data Ten, end linear velocity change data Vel, pay end winding diameter change data Pay, take-up end winding diameter change data Tak, first temperature zone setting data Tmpa, second temperature zone setting data Tmpb, and end wire diameter change data Dia. The data is then integrated to form the end input dataset Inp.

[0069] The wire drawing state recognition module identifies the current final drawing state based on the final input dataset Inp and generates the final state result Sta.

[0070] The thermal process rearrangement module performs thermal process rearrangement on the last three passes of the final pull according to the final state result Sta, so that the last three passes of the final pull sequentially form a low heat input entry section, a controlled micro-increase heat input peak clipping section, and a relatively low heat input steady-state transition section, which together form the final thermal process result Htp.

[0071] The short-path processing module performs short-path tempering on the ultra-fine tungsten wire after the third final stage corresponding to the final thermal history result Htp, and before entering the final shaping stage, to reduce the residual stress in the final stage and generate the short-path processing result Tmp.

[0072] This invention provides a precision wire drawing collaborative control system and method based on ultra-fine tungsten wire, which has the following beneficial effects:

[0073] (1) By collecting the final tension change data Ten, the final linear velocity change data Vel, the pay-off end winding diameter change data Pay, the take-up end winding diameter change data Tak, the first temperature zone setting data Tmpa, the second temperature zone setting data Tmpb, and the final wire diameter change data Dia, a final input dataset Inp is formed; then, the final state result Sta is generated from the final input dataset Inp; then, the thermal history of the last three passes of final drawing is rearranged based on the final state result Sta, and short-range tempering is continued based on the final thermal history result Htp to generate the short-range processing result Tmp. In this way, the final stage of final drawing no longer adopts a single continuous stretching and single continuous heating process, but before entering the final shaping stage, the final state identification, the final thermal input sequence adjustment, and the final residual stress processing are completed in sequence, thereby addressing the problems of increased surface embrittlement tendency, increased wire breakage probability in the final stage, instability of free coil diameter, increased fluctuation of wire diameter in the later stage, and difficulty in maintaining the final strength and geometric state simultaneously.

[0074] (2) By converting the final stage state result Sta into an executable final stage temperature zone control path, and setting the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb in the order of the first, second, and third final stages respectively, the final stage path result Pat is formed, and then the final stage thermal history result Htp is further formed. In this way, the subsequent control no longer stops at the judgment of "whether it is abnormal", but can correspond different states to different heat input levels and implement them to the specific positions of the last three passes of the final drawing. Specifically, the first final stage maintains the first heat input level to ensure that the ultra-fine tungsten wire enters the last three passes of the final drawing smoothly; the second final stage selects the second, fourth, or fifth heat input level according to the final stage state result Sta to deal with the stress concentration that has been formed in the final drawing stage; the third final stage returns to the third heat input level to restore the lower heat input state before entering the subsequent short-range processing.

[0075] (3) By setting an independent short-range tempering process after the final thermal history result Htp is completed and before entering the final shaping pass, the residual stress in the final section that remains inside the ultra-fine tungsten wire after the last three final drawing passes can be further reduced, instead of directly carrying the heated state after the third final section into the final shaping. The key point here is not data processing, state identification, or thermal history segmentation itself, but rather: after the third final section has returned to a lower heat input state, a separate short-range tempering treatment interval is set, and a setting path that is higher than the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the third final section, while being lower than the preset recrystallization failure threshold range, is used to supplement the residual stress in the final section. This can avoid two situations: first, directly using the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the third final section into the final shaping, resulting in insufficient treatment of the residual stress in the final section; second, the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb in the short-range tempering treatment interval are too high, approaching the recrystallization failure condition, resulting in abnormal strength and wire diameter. Attached Figure Description

[0076] Figure 1 This is a schematic diagram illustrating the steps of a precision wire drawing collaborative control method based on ultra-fine tungsten wire prepared according to the present invention.

[0077] Figure 2 This is a schematic diagram of a precision wire drawing collaborative control system based on ultra-fine tungsten wire, according to the present invention.

[0078] Figure 3 This is a schematic diagram of the generation of Htp, the final thermal process result. Detailed Implementation

[0079] The technical solutions of the present invention will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0080] Example 1

[0081] This invention provides a precision wire drawing collaborative control method based on ultra-fine tungsten wire preparation. Please refer to [link / reference]. Figure 1 This includes the following steps:

[0082] S1. Before the ultra-fine tungsten wire enters the last three passes of final drawing, collect the following data corresponding to this stage: end tension change data Ten, end linear velocity change data Vel, pay end winding diameter change data Pay, take-up end winding diameter change data Tak, first temperature zone setting data Tmpa, second temperature zone setting data Tmpb, and end wire diameter change data Dia. Integrate these data to form the end input dataset Inp.

[0083] S2. Identify the current final stretch forming state based on the final stretch input dataset Inp, and generate the final stretch state result Sta.

[0084] S3. Based on the final stage state result Sta, the thermal history of the last three passes of the final pull is rearranged so that the last three passes of the final pull form a low heat input entry section, a controlled micro-increase heat input peak reduction section, and a relatively low heat input steady-state transition section in sequence, which constitutes the final stage thermal history result Htp.

[0085] S4. After the third stage of the thermal process, corresponding to the final stage Htp, and before entering the final shaping stage, the ultrafine tungsten wire is subjected to short-path tempering to reduce the residual stress in the final stage and generate the short-path processing result Tmp.

[0086] In this embodiment, the final stage input dataset Inp is formed using the final stage tension change data Ten, the final stage linear velocity change data Vel, the pay-off end coil diameter change data Pay, the take-up end coil diameter change data Tak, the first temperature zone setting data Tmpa, the second temperature zone setting data Tmpb, and the final stage wire diameter change data Dia. Then, the final stage state result Sta is generated from the final stage input dataset Inp. Based on the final stage state result Sta, the thermal history of the last three final drawing passes is rearranged. Finally, based on the final stage thermal history result Htp, short-range tempering is performed to generate a short-range processing result Tmp. This means that the final stage of final drawing no longer uses a single continuous tension and heating method. Instead, before entering the final shaping stage, the final stage state is identified, the final stage thermal input sequence is adjusted, and residual stress after the third final stage is further processed. This allows for targeted treatment of problems such as increased surface embrittlement tendency, increased wire breakage probability in the final stage, instability of free loop diameter, increased wire diameter fluctuation in the later stages, and the difficulty in simultaneously maintaining final strength and geometric state in the final drawing stage. In practical production scenarios, for example, the same roll of ultra-fine tungsten wire may run normally in the early stages of final drawing, but after entering the last three passes of final drawing, it often experiences accelerated tension changes, concentrated wire diameter fluctuations at the end, and more inconsistent quality in the later stages of the finished product. First, the current state of the final stage is identified through the final stage state result Sta. Then, the heat input sequence of the last three passes of final drawing is changed through the final stage thermal history result Htp. Before entering the final shaping stage, the residual stress in the final stage is reduced through the processing corresponding to the short-range processing result Tmp. This makes the heat input path and processing sequence in the final stage of final drawing more in line with the forming characteristics of the final stage of ultra-fine tungsten wire, reducing the accumulation of thermal shock and stress concentration in the final stage, reducing wire breakage and wire diameter fluctuations in the later stages, and improving the consistency of the entire roll of product in the final drawing stage.

[0087] Example 2

[0088] Specifically: S1 includes S11;

[0089] S11. Before the ultra-fine tungsten wire enters the last three final drawing stages, read the output content of the detection unit and setting unit corresponding to the final drawing stage in the wire drawing equipment.

[0090] This includes: the tension detection unit reads the tension values ​​of the ultra-fine tungsten wire in the corresponding intervals of the last three passes of final tensioning, and organizes them into the final tension change data Ten according to the order of acquisition;

[0091] The linear velocity detection unit reads the linear velocity values ​​of the ultrafine tungsten wire in the corresponding intervals of the last three final stretches, and organizes them into the final linear velocity change data Vel according to the order of acquisition.

[0092] The wire end diameter detection unit reads the wire end diameter detection value and organizes it into wire end diameter change data Pay according to the order of collection.

[0093] The take-up end winding diameter detection unit reads the winding diameter detection value at the take-up end and organizes it into winding diameter change data Tak in the order of collection.

[0094] The first temperature zone setting unit reads the first temperature zone setting value and organizes it into the first temperature zone setting data Tmpa according to the order of acquisition.

[0095] The second temperature zone setting unit reads the second temperature zone setting value and organizes it into second temperature zone setting data Tmpb according to the order of acquisition.

[0096] The wire diameter detection unit reads the wire diameter detection values ​​of the ultra-fine tungsten wire in the corresponding interval of the last three final drawing passes, and organizes them into the final wire diameter change data Dia according to the order of collection.

[0097] Then, the data read from each unit is integrated to obtain the basic operating data set.

[0098] S1 further includes S12;

[0099] S12. Organize the basic operational data group accordingly, the corresponding organization including:

[0100] Extract the pre-set unified acquisition cycle, sort and organize the following data: end tension change data Ten, end linear velocity change data Vel, pay end winding diameter change data Pay, take-up end winding diameter change data Tak, first temperature zone setting data Tmpa, second temperature zone setting data Tmpb, and end wire diameter change data Dia, and assign the corresponding acquisition sequence number to the data position within each unified acquisition cycle.

[0101] Then, using the acquisition sequence number as the unique basis for corresponding data, the final tension change data Ten, the final linear velocity change data Vel, the wire diameter change data Pay, the take-up wire diameter change data Tak, the first temperature zone setting data Tmpa, the second temperature zone setting data Tmpb, and the final wire diameter change data Dia under the same acquisition sequence number are matched accordingly, so that each data forms a set of corresponding data arranged according to the acquisition sequence number in the corresponding interval of the last three passes of the final pull;

[0102] Then, the corresponding data from each group are integrated according to the collection sequence number to form the final input dataset Inp;

[0103] It should be noted that:

[0104] The unified data collection cycle refers to the fixed data collection interval used when synchronously organizing the data of each item in the corresponding interval of the last three passes of the final pull.

[0105] At the same fixed time interval, continuously read the following data: end tension change (Ten), end linear velocity change (Vel), pay wire diameter change (Pay), take-up wire diameter change (Tak), first temperature zone setting (Tmpa), second temperature zone setting (Tmpb), and end wire diameter change (Dia), and assign each reading result to a collection sequence number.

[0106] The time interval between the reading time corresponding to the next acquisition sequence number and the reading time corresponding to the previous acquisition sequence number is the same, and the time interval is the unified acquisition cycle.

[0107] The final input dataset Inp uses multiple sets of data records arranged in order of collection sequence number.

[0108] Each data record includes a collection sequence number, as well as the following corresponding data: end tension change (Ten), end linear velocity change (Vel), pay end winding diameter change (Pay), take-up end winding diameter change (Tak), first temperature zone setting (Tmpa), second temperature zone setting (Tmpb), and end wire diameter change (Dia).

[0109] The aforementioned resampling refers to uniformly resampling each data point at fixed time intervals according to a unified collection cycle, specifically including:

[0110] Using a preset time interval as the data acquisition benchmark, at the end of each time interval, one data value within the corresponding time interval is extracted from the following data: Ten (end tension change data), Vel (end linear velocity change data), Pay (end winding diameter change data), Tak (take-up winding diameter change data), Tmpa (first temperature zone setting data), Tmpb (second temperature zone setting data), and Dia (end wire diameter change data).

[0111] When there are multiple data values ​​within a certain time interval, the data value corresponding to the end of the time interval is taken; when there are no data values ​​within a certain time interval, the data value corresponding to the previous time interval is taken.

[0112] The data values ​​extracted from each data point at the same time interval are combined into a group of data, and a collection sequence number is assigned to this group of data.

[0113] Arrange the data groups corresponding to each collection number in chronological order to complete the sorting.

[0114] In this embodiment, through the processing of S11 and S12 described above, the original data scattered in different detection units and setting units within the corresponding intervals of the last three passes of the final pull can be uniformly organized into a final-segment input dataset Inp under the same acquisition basis. This solves the problem that data from different sources, acquisition frequencies, and recording times in actual production cannot be directly matched. Specifically, after the final-segment tension change data Ten, the final-segment linear velocity change data Vel, the pay-off end winding diameter change data Pay, the take-up end winding diameter change data Tak, the first temperature zone setting data Tmpa, the second temperature zone setting data Tmpb, and the final-segment wire diameter change data Dia are sorted and matched under a unified acquisition cycle, each set of data records can clearly reflect the tension, velocity, winding diameter, temperature zone setting, and wire diameter status of the final pull of the ultra-fine tungsten wire at the same moment. In this way, when performing status identification based on the final-segment input dataset Inp, it is not a matter of forcibly putting several misaligned data together for judgment, but rather judging the complete operating status under the same acquisition position. In practical applications, for example, the tension detection unit in wire drawing equipment updates rapidly, while the outputs of the wire diameter detection unit and the roll diameter detection unit differ in sequence. Without a unified acquisition cycle and acquisition sequence number, it's easy for the final tension change data Ten to change at a certain moment, while the corresponding final wire diameter change data Dia and the unwinding end roll diameter change data Pay remain at the previous moment, leading to distorted subsequent judgment results. With this solution, all data are entered into the final input dataset Inp according to a unified acquisition cycle, ensuring consistency in the operating status corresponding to the same set of data records. This facilitates accurate identification of the final drawing stage forming state and improves the pertinence and reliability of subsequent control actions.

[0115] Example 3

[0116] Specifically: S2 includes S21;

[0117] S21. Select six consecutive sets of data records with consecutive acquisition sequence numbers from the input dataset Inp at the end of the segment, use them as the data window for the current state recognition, and define the six sets of data records as the state recognition window Win.

[0118] Each set of data records in the status recognition window Win includes the following data under the same acquisition sequence number: end tension change data Ten, end linear velocity change data Vel, pay end winding diameter change data Pay, take-up end winding diameter change data Tak, first temperature zone setting data Tmpa, second temperature zone setting data Tmpb, and end wire diameter change data Dia.

[0119] The data records of the first three areas in the status recognition window Win, arranged in the order of collection sequence number, are used as the first comparison data, and the data records of the last three areas are used as the second comparison data.

[0120] It should be noted that:

[0121] Six sets of data were selected because: when fewer than six sets of consecutively selected data records are selected, at least one of the two segments will have fewer than three sets of data, making it impossible to make a corresponding comparison between the two segments.

[0122] When more than six sets of data records are selected consecutively, the length of the interval covered by a single state recognition increases, which reduces the timeliness of the current final stage state recognition. Therefore, six sets of data records are selected as the data basis for a single state recognition.

[0123] S2 further includes S22;

[0124] S22. Determine the status recognition window Win, and the determination rules include:

[0125] When the difference between the maximum and minimum values ​​of the end-segment tension change data Ten in the status recognition window Win is within the preset tension range;

[0126] The difference between the maximum and minimum values ​​of the final segment linear velocity change data Vel is within the preset velocity range;

[0127] The difference between the maximum and minimum values ​​of the final wire diameter variation data Dia is within the preset wire diameter range;

[0128] Furthermore, when the data on the change in the coil diameter at the pay-off end (Pay) decreases sequentially according to the acquisition sequence number, and the data on the change in the coil diameter at the take-up end (Tak) increases sequentially according to the acquisition sequence number, the current final drawing stage forming state is determined to be a stable forming state.

[0129] The average value of the tension change data (Ten) at the end of the current segment in the comparison data is less than the average value of the tension change data (Ten) at the end of the subsequent segment in the comparison data.

[0130] The average value of the linear velocity change data (Vel) in the final segment of the comparison data in the first segment is greater than or equal to the average value of the linear velocity change data (Vel) in the final segment of the comparison data in the second segment.

[0131] Furthermore, if the average decrease in the final section diameter change data Dia in the preceding comparison data is greater than the average decrease in the final section diameter change data Dia in the following comparison data, then the current final stretching final section forming state is determined to be a state of continuous stress accumulation.

[0132] When the direction of change of the final tension data Ten between two adjacent sets of data records in the status recognition window Win changes alternately two or more times;

[0133] If the direction of change of the final segment linear velocity data Vel between two adjacent sets of data records alternates two or more times; and the difference between the maximum and minimum values ​​of the final segment wire diameter change data Dia exceeds the preset wire diameter range, the current final drawing final segment forming state is determined to be a fluctuation amplification state.

[0134] Write the determined stable forming state, stress continuous accumulation state, or fluctuation amplification state into the final state result Sta.

[0135] It should be noted that:

[0136] The preset tension range refers to the allowable tension difference range obtained by statistically analyzing the difference between the maximum and minimum tension values ​​in six consecutive sets of data records during the stable production of ultra-fine tungsten wires of the same specification before the ultra-fine tungsten wire enters the last three final drawing stages.

[0137] The upper and lower limits of the allowable tension difference range are pre-written as the determination range of the final tension change data Ten.

[0138] The preset speed range refers to the allowable range of speed difference obtained by statistically analyzing the difference between the maximum and minimum linear speed values ​​in six consecutive sets of data records when the ultrafine tungsten wire of the same specification is produced stably.

[0139] The upper and lower limits of the allowable speed difference range are pre-written as the determination range for the final segment linear velocity change data Vel.

[0140] The preset wire diameter range refers to the allowable range of wire diameter difference obtained by statistically analyzing the difference between the maximum and minimum wire diameter values ​​in six consecutive sets of data records when the same specification of ultra-fine tungsten wire is produced stably.

[0141] The upper and lower limits of the allowable range for the wire diameter difference are pre-written as the determination range for the final wire diameter change data Dia.

[0142] In this embodiment, through the processing of S21 and S22 described above, the continuously changing running data in the final input dataset Inp can be further converted into a final state result Sta that can be used to directly determine the final state of the final stretching stage. This solves the problem in actual production where "although data is collected, it is impossible to clearly determine whether the current final stretching stage is a normal finish, a continuous deterioration, or a start of amplified fluctuations." Specifically, six consecutive sets of data records with consecutive collection numbers are extracted from the final input dataset Inp to form a state recognition window Win. Then, the state recognition window Win is divided into front-segment comparison data and back-segment comparison data, so that the judgment process can see both the overall fluctuation range within the same small segment and the changing trend between the front and back segments. Based on this, the specific changing relationships of the final tension change data Ten, the final linear velocity change data Vel, the pay-off end coil diameter change data Pay, the take-up end coil diameter change data Tak, and the final wire diameter change data Dia are combined to classify the current state into a stable forming state, a state of continuous stress accumulation, or a state of amplified fluctuations, and write this into the final state result Sta. The advantage of this approach is that it allows us to move beyond simply observing a change in a single parameter. Instead, we can determine whether this change is a normal final stage change or an abnormal final stage change requiring intervention. In practical production scenarios, for example, when a roll of ultra-fine tungsten wire is in the final drawing stage, the final tension data (Ten) gradually increases, the final linear velocity data (Vel) no longer maintains its original level, and the average decrease in the final wire diameter data (Dia) begins to diminish. At this point, simply looking at a single tension or wire diameter value often cannot directly determine whether an abnormal state has been entered. By using the status recognition window (Win) to compare the data from the two stages, we can promptly identify this situation—where "drawing continues on the surface, but stress is actually accumulating in the final stage"—as a state of continuous stress accumulation. This information is then recorded in the final stage status result (Sta), providing a clear basis for subsequent thermal history rearrangement and preventing the final drawing stage from continuing along the original path before any obvious wire breakage.

[0143] Example 4

[0144] Please see Figure 3 Specifically: S3 includes S31;

[0145] S31. Read the final state result Sta, and divide the last three passes of the final pull into the first final segment, the second final segment, and the third final segment in sequence.

[0146] The heat input adjustment for the last three passes of the final drawing is achieved by adjusting the temperature zone setting value corresponding to the final stage of the final drawing. The temperature zone setting value includes the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb.

[0147] When the final state result Sta indicates that the current final stretch forming state is a stable forming state, the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the first final stretch are set to the first heat input level.

[0148] Set the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the second end section to the second heat input level;

[0149] Set the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the third end section to the third heat input level;

[0150] Among them, the second heat input level is higher than the first heat input level, and the third heat input level is lower than the second heat input level;

[0151] When the final state result Sta indicates that the current final stretching and forming state is a state of continuous stress accumulation, the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the first final stage are kept at the first heat input level.

[0152] Adjust the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the second end section to the fourth heat input level;

[0153] The first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the third end section are adjusted to the third heat input level, wherein the fourth heat input level is higher than the second heat input level;

[0154] When the final state result Sta indicates that the current final stretch forming state is a fluctuation amplification state, the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the first final stage are kept at the first heat input level; the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the second final stage are adjusted to the fifth heat input level.

[0155] The first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the third end section are adjusted to the third heat input level, wherein the fifth heat input level is higher than the fourth heat input level;

[0156] Record the temperature zone settings corresponding to each terminal segment in the order of the first terminal segment, the second terminal segment, and the third terminal segment to form the terminal segment path result Pat;

[0157] It should be noted that:

[0158] The final three passes correspond to the first, second, and third final stages, respectively. Based on the current pass position, the corresponding first temperature zone setting data (Tmpa) and second temperature zone setting data (Tmpb) are written segment by segment. When the ultra-fine tungsten filament reaches the first final stage, only the temperature zone setting value corresponding to the first final stage is executed. When the ultra-fine tungsten filament enters the second final stage, the temperature zone setting value corresponding to the second final stage overwrites the previous setting value. When the ultra-fine tungsten filament enters the third final stage, the temperature zone setting value corresponding to the third final stage overwrites the previous setting value again.

[0159] In other words, the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb correspond to only one final stage at any given time. There is no situation where three final stages simultaneously call the same set of temperature zone settings, thus preventing cross-contamination and conflicts. This setting is based on the fact that the last three final drawing passes are performed sequentially according to the processing order, and the temperature zone control also switches sequentially according to the pass order. The purpose of this setting is to use the same set of temperature zone execution units to complete the control of three different heat inputs. The technical effect of this setting is that the temperature zone switching sequence is fixed, the control process is clear, and during implementation, multiple final stages will not simultaneously occupy the same temperature zone setting value.

[0160] The first heat input level to the fifth heat input level are each composed of a set of first temperature zone setting data Tmpa and a set of second temperature zone setting data Tmpb;

[0161] During implementation, the temperature zone setting value used at the starting position of the last three passes of the final drawing of the same specification ultra-fine tungsten wire under stable production conditions is first selected as the reference setting value. The first reference temperature zone value is written into the first temperature zone setting data Tmpa, and the second reference temperature zone value is written into the second temperature zone setting data Tmpb. This set of reference setting values ​​is defined as the first heat input level.

[0162] Based on the first heat input level, simultaneously increase the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb by 3 to 10 degrees Celsius each to obtain the second heat input level; set the third heat input level to be the same as the first heat input level; based on the second heat input level, simultaneously increase the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb by 3 to 10 degrees Celsius each to obtain the fourth heat input level; based on the fourth heat input level, simultaneously increase the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb by 3 to 10 degrees Celsius each to obtain the fifth heat input level.

[0163] Therefore, the relationship between the five heat input levels is fixed as follows: the first heat input level is equal to the third heat input level, the second heat input level is higher than the first heat input level, the fourth heat input level is higher than the second heat input level, and the fifth heat input level is higher than the fourth heat input level.

[0164] The purpose of this setup is to ensure a smooth entry in the first stage, to increase heat input to reduce stress concentration in the second stage, and to restore a lower heat input and proceed to the next processing stage in the third stage. When the final state result Sta changes from a stable forming state to a state of continuous stress accumulation or a state of amplified fluctuations, the heat input amplitude corresponding to the second stage needs to be increased step by step.

[0165] S3 further includes S32;

[0166] S32. Based on the final path result Pat, perform temperature zone control on the last three final pulls.

[0167] In the first final segment, according to the temperature zone setting value corresponding to the first final segment in the final segment path result Pat, adjust the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb to make the first final segment a low heat input entry segment.

[0168] In the second final segment, according to the temperature zone setting value corresponding to the second final segment in the final segment path result Pat, adjust the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb to make the second final segment a controlled micro-heat input peak-shaving segment.

[0169] In the third final stage, according to the temperature zone setting value corresponding to the third final stage in the final stage path result Pat, adjust the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb to make the third final stage form a low heat input steady-state transition stage.

[0170] After completing the temperature zone control corresponding to the first, second and third final stages, record the temperature zone adjustment results corresponding to the last three final pulls in the execution order to form the final stage thermal history result Htp.

[0171] It should be noted that:

[0172] The low heat input entry section refers to maintaining the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb at the first heat input level in the first final section, so that the ultrafine tungsten wire undergoes low heat input treatment before entering the last three passes of final drawing.

[0173] This setting is because when the ultra-fine tungsten wire enters the last three stages of final drawing, the material cross-section is already small. If the temperature zone setting value is directly increased, the tension and wire diameter changes at the end are likely to increase simultaneously. Therefore, the first heat input level is used first to allow the ultra-fine tungsten wire to enter the last three stages of final drawing according to the current wire drawing state.

[0174] The purpose of this setting is to maintain stable entry conditions at the starting position of the last three passes of the final drawing process; thereby reducing the thermal shock when the ultrafine tungsten wire just enters the last three passes of the final drawing process, and reducing the sudden changes in tension and wire diameter at the end.

[0175] The controlled micro-increase heat input peak reduction section refers to the process in the second final section where the heat input level of the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb is increased from the heat input level corresponding to the previous final section to one of the second heat input level, the fourth heat input level, or the fifth heat input level, so that the heat input of the second final section is higher than that of the first final section.

[0176] This setting is because after the first end section, the ultra-fine tungsten wire continues to undergo tensile deformation in the last three final stretches. The residual stress and surface stress concentration in the end section will continue to accumulate in the corresponding range of the second end section. Therefore, it is necessary to increase the temperature setting value in the second end section so that the ultra-fine tungsten wire can obtain a higher heat input in this range than in the first end section.

[0177] The purpose of this design is to reduce the stress concentration formed in the previous stage within the second final stage; thereby reducing the stress peak in the final drawing stage, reducing wire breakage, wire diameter fluctuations, and instability in the final forming.

[0178] The lower heat input steady-state transition section refers to the process in the third final section where the heat input level corresponding to the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb is reduced from the heat input level corresponding to the second final section to the third heat input level, so that the heat input in the third final section is lower than that in the second final section.

[0179] This setting is because if the third stage continues to maintain the heat input level corresponding to the second stage after the second stage has completed the high heat input process, the ultrafine tungsten filament will continue to be in a high heated state before entering the subsequent short-processing and final shaping, which is not conducive to the subsequent process switching; therefore, the temperature setting value is reduced back to a lower level in the third stage.

[0180] The purpose of this setting is to restore a lower heat input state after the second final stage and send the ultra-fine tungsten wire into the subsequent processing stage; thereby reducing the impact of continued heating after the second final stage, keeping the final three drawing passes at a stable position, which facilitates subsequent short-path processing and final shaping.

[0181] In this embodiment, through the processing of S31 and S32 described above, the final state result Sta can be further transformed into a directly executable final temperature zone control path. Instead of using the same set of temperature zone settings for the last three passes of the final pull, the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb are set in segments according to the order of the first, second, and third final passes, thus forming the final path result Pat, which is further used to form the final thermal history result Htp. The advantage of this process is that when the final pull stage has been identified as different states, subsequent control no longer stops at the level of "whether it is abnormal," but can further subdivide the degree of abnormality to specific heat input levels and implement it at different positions in the last three passes of the final pull. Specifically, the first stage maintains the first heat input level, preventing sudden temperature increases and tension jumps in the ultra-fine tungsten wire during the final three passes of final drawing. The second stage selects the second, fourth, or fifth heat input levels based on the final stage state (Sta), corresponding to different heat input intensities to address stress concentrations already formed in the final drawing stage. The third stage uniformly returns to the third heat input level, bringing the temperature back to a lower level before entering subsequent short-range processing. In actual production, for example, during continuous daytime operation of the equipment, some ultra-fine tungsten wires of the same specification may only exhibit slight stress accumulation in the final three passes of final drawing, while at night, with the combined effects of equipment temperature rise and continuous production, other wires may have entered a state of amplified fluctuations. If the same set of final stage temperature settings is used in both cases, the former may be under-treated, the latter over-treated, or the third stage may still maintain excessively high heat input. Different second-stage heat input levels can be selected based on the final stage state result Sta. By writing sequentially, the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb correspond to only one final stage at each moment. This avoids the cross-use of temperature zone settings among the three final stages and ensures that the last three passes of the final drawing form a temperature zone execution sequence of "smooth entry first, then graded peak reduction, and finally stable transition". This transforms the final drawing stage control from a single temperature zone setting to a segmented thermal history control that changes with the state, improving the matching degree between the final stage heat input arrangement and the actual forming state.

[0182] Example 5

[0183] Specifically: S4 includes S41;

[0184] S41. Read the final thermal history result Htp and determine the running interval between the end position of the third final stage and the start position of the final shaping pass as the short-range tempering processing interval.

[0185] Based on the temperature zone adjustment results corresponding to the third final stage in the final thermal history result Htp, determine the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the short-path tempering treatment interval.

[0186] The first temperature zone setting data Tmpa corresponding to the short-range tempering treatment interval is greater than the first temperature zone setting data Tmpa corresponding to the third end segment, the second temperature zone setting data Tmpb corresponding to the short-range tempering treatment interval is greater than the second temperature zone setting data Tmpb corresponding to the third end segment, and both the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the short-range tempering treatment interval are within the preset recrystallization damage threshold range.

[0187] The first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the short-range tempering process are integrated with the short-range tempering process to form the short-range tempering setting result Ann.

[0188] It should be noted that:

[0189] The recrystallization damage threshold range refers to the process of performing heat treatment sequentially on ultra-fine tungsten wires of the same specification in the final drawing stage during trial production, according to different combinations of first temperature zone setting data Tmpa and second temperature zone setting data Tmpb, and detecting the strength change and wire diameter change of the ultra-fine tungsten wires after each heat treatment.

[0190] When the intensity of the ultrafine tungsten wire continuously decreases and the wire diameter continuously increases for the first time, the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to this heat treatment are determined as the recrystallization failure initiation setting value.

[0191] The range of recrystallization failure threshold is determined by combining the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb, which are both below the recrystallization failure initiation setting value.

[0192] S4 further includes S42;

[0193] S42. When the ultrafine tungsten wire runs to the short-range tempering treatment zone, the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb recorded in the short-range tempering setting result Ann are called and written into the first temperature zone control unit and the second temperature zone control unit respectively, so that the ultrafine tungsten wire completes one continuous heating treatment in the short-range tempering treatment zone.

[0194] It should be noted that:

[0195] The adjustment of the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb in the corresponding interval according to the short-range tempering setting result Ann is achieved by writing the first temperature zone setting data Tmpa corresponding to the short-range tempering setting result Ann into the first temperature zone and writing the second temperature zone setting data Tmpb corresponding to the short-range tempering setting result Ann into the second temperature zone when the ultrafine tungsten wire runs to the starting position of the short-range tempering treatment interval.

[0196] During the process of the ultrafine tungsten filament moving from the beginning position of the short-range tempering treatment interval to the end position of the short-range tempering treatment interval, the first temperature zone and the second temperature zone are heated according to the written first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb, respectively, so that the ultrafine tungsten filament completes continuous heating treatment within the interval.

[0197] In this embodiment, through the processing of S41 and S42 described above, an independent short-range tempering process can be inserted after the final thermal history result Htp is completed and before entering the final shaping pass. This further reduces the residual stress in the extremely fine tungsten wire that remains after the last three final drawing passes, instead of directly entering the final shaping pass with the heated state after the third final stage. The advantage of this part is not in data processing, state identification, or segmented control of the final thermal history, but in that: after the third final stage has returned to a lower heat input state, a separate short-range tempering process is defined, and a set path that is higher than the first temperature zone set data Tmpa and the second temperature zone set data Tmpb corresponding to the third final stage, while being lower than the preset recrystallization damage threshold range, is used to specifically supplement the residual stress in the final stage. This approach avoids two common problems: First, if the set data Tmpa for the first temperature zone and Tmpb for the second temperature zone corresponding to the third end are directly used for the final shaping, the residual stress treatment in the last stage will be insufficient, and local fluctuations may still occur during the final shaping. Second, if the set data Tmpa for the first temperature zone and Tmpb for the second temperature zone in the short-range tempering treatment interval are set too high, it is easy to approach the recrystallization failure condition, resulting in abnormal strength and wire diameter. Based on actual production conditions, for example, after adjusting the final thermal process result Htp of the last three passes of the final drawing of ultra-fine tungsten wire of the same specification, although the tension fluctuation has converged, some coiled wires may still experience a faster decrease in strength and a worse consistency in the final wire diameter before entering the final shaping stage. First, determine the short-path tempering treatment range based on the temperature zone adjustment result corresponding to the third final stage. Then, write the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the short-path tempering setting result Ann into the first and second temperature zones, and keep them running throughout the entire short-path tempering treatment range. This allows the ultra-fine tungsten wire to undergo another controlled continuous heating treatment before entering the final shaping stage. This further reduces the residual stress at the end without entering the recrystallization damage range, improves the consistency of the state before entering the final shaping stage, and reduces the risk of dimensional instability and abnormal strength in the later stage of the final shaping stage.

[0198] Example 6

[0199] A precision wire drawing collaborative control system based on ultra-fine tungsten wires, please refer to... Figure 2 Specifically, it includes a tungsten filament drawing stage data acquisition module, a drawing state identification module, a hot section rearrangement module, and a short-range processing module;

[0200] Before the ultra-fine tungsten wire enters the final three stages of final drawing, the data acquisition module of the tungsten wire drawing stage collects the following data: end tension change data Ten, end linear velocity change data Vel, pay end winding diameter change data Pay, take-up end winding diameter change data Tak, first temperature zone setting data Tmpa, second temperature zone setting data Tmpb, and end wire diameter change data Dia. The data is then integrated to form the end input dataset Inp.

[0201] The wire drawing state recognition module identifies the current final drawing state based on the final input dataset Inp and generates the final state result Sta.

[0202] The thermal process rearrangement module performs thermal process rearrangement on the last three passes of the final pull according to the final state result Sta, so that the last three passes of the final pull sequentially form a low heat input entry section, a controlled micro-increase heat input peak clipping section, and a relatively low heat input steady-state transition section, which together form the final thermal process result Htp.

[0203] The short-path processing module performs short-path tempering on the ultra-fine tungsten wire after the third final stage corresponding to the final thermal history result Htp, and before entering the final shaping stage, to reduce the residual stress in the final stage and generate the short-path processing result Tmp.

[0204] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A precision wire drawing collaborative control method based on ultra-fine tungsten wire, characterized in that: Includes the following steps: S1. Before the ultra-fine tungsten wire enters the last three final drawing passes, collect the following data corresponding to this stage: end tension change data Ten, end linear velocity change data Vel, pay end winding diameter change data Pay, take-up end winding diameter change data Tak, first temperature zone setting data Tmpa, second temperature zone setting data Tmpb, and end wire diameter change data Dia. Integrate these data to form the end input dataset Inp. S2. Identify the current final stretch forming state based on the final stretch input dataset Inp, and generate the final stretch state result Sta. S3. Based on the final stage state result Sta, the thermal history of the last three passes of the final pull is rearranged so that the last three passes of the final pull form a low heat input entry section, a controlled micro-increase heat input peak reduction section, and a relatively low heat input steady-state transition section in sequence, which constitutes the final stage thermal history result Htp. S4. After the third stage of the thermal process, corresponding to the final stage Htp, and before entering the final shaping stage, the ultrafine tungsten wire is subjected to short-path tempering to reduce the residual stress in the final stage and generate the short-path processing result Tmp.

2. The precision wire drawing collaborative control method based on ultra-fine tungsten wire preparation according to claim 1, characterized in that: S1 includes S11; S11. Before the ultra-fine tungsten wire enters the last three final drawing stages, read the output content of the detection unit and setting unit corresponding to the final drawing stage in the wire drawing equipment. This includes: the tension detection unit reads the tension values ​​of the ultra-fine tungsten wire in the corresponding intervals of the last three passes of final tensioning, and organizes them into the final tension change data Ten according to the order of acquisition; The linear velocity detection unit reads the linear velocity values ​​of the ultrafine tungsten wire in the corresponding intervals of the last three final stretches, and organizes them into the final linear velocity change data Vel according to the order of acquisition. The wire end diameter detection unit reads the wire end diameter detection value and organizes it into wire end diameter change data Pay according to the order of collection. The take-up end winding diameter detection unit reads the winding diameter detection value at the take-up end and organizes it into winding diameter change data Tak in the order of collection. The first temperature zone setting unit reads the first temperature zone setting value and organizes it into the first temperature zone setting data Tmpa according to the order of acquisition. The second temperature zone setting unit reads the second temperature zone setting value and organizes it into second temperature zone setting data Tmpb according to the order of acquisition. The wire diameter detection unit reads the wire diameter detection values ​​of the ultra-fine tungsten wire in the corresponding interval of the last three final drawing passes, and organizes them into the final wire diameter change data Dia according to the order of collection. Then, the data read from each unit is integrated to obtain the basic operating data set.

3. The precision wire drawing collaborative control method based on ultra-fine tungsten wire preparation according to claim 2, characterized in that: S1 further includes S12; S12. Organize the basic operational data group accordingly, the corresponding organization including: Extract the pre-set unified acquisition cycle, sort and organize the following data: end tension change data Ten, end linear velocity change data Vel, pay end winding diameter change data Pay, take-up end winding diameter change data Tak, first temperature zone setting data Tmpa, second temperature zone setting data Tmpb, and end wire diameter change data Dia, and assign the corresponding acquisition sequence number to the data position within each unified acquisition cycle. Then, using the acquisition sequence number as the unique basis for corresponding data, the final tension change data Ten, the final linear velocity change data Vel, the wire diameter change data Pay, the take-up wire diameter change data Tak, the first temperature zone setting data Tmpa, the second temperature zone setting data Tmpb, and the final wire diameter change data Dia under the same acquisition sequence number are matched accordingly, so that each data forms a set of corresponding data arranged according to the acquisition sequence number in the corresponding interval of the last three passes of the final pull; Then, the data from each group are integrated according to the collection sequence number to form the final input dataset Inp.

4. The precision wire drawing collaborative control method based on ultra-fine tungsten wire preparation according to claim 3, characterized in that: S2 includes S21; S21. Select six consecutive sets of data records with consecutive acquisition sequence numbers from the input dataset Inp at the end of the segment, use them as the data window for the current state recognition, and define the six sets of data records as the state recognition window Win. Each set of data records in the status recognition window Win includes the following data under the same acquisition sequence number: end tension change data Ten, end linear velocity change data Vel, pay end winding diameter change data Pay, take-up end winding diameter change data Tak, first temperature zone setting data Tmpa, second temperature zone setting data Tmpb, and end wire diameter change data Dia. The data records in the first three zones of the status recognition window Win, arranged in the order of collection sequence number, are used as the first-stage comparison data, and the data records in the last three zones are used as the second-stage comparison data.

5. The precision wire drawing collaborative control method based on ultra-fine tungsten wire preparation according to claim 4, characterized in that: S2 further includes S22; S22. Determine the status recognition window Win, and the determination rules include: When the difference between the maximum and minimum values ​​of the end-segment tension change data Ten in the status recognition window Win is within the preset tension range; The difference between the maximum and minimum values ​​of the final linear velocity change data Vel is within the preset velocity range; The difference between the maximum and minimum values ​​of the final wire diameter variation data Dia is within the preset wire diameter range; Furthermore, when the data on the change in the coil diameter at the pay-off end (Pay) decreases sequentially according to the acquisition sequence number, and the data on the change in the coil diameter at the take-up end (Tak) increases sequentially according to the acquisition sequence number, the current final drawing stage forming state is determined to be a stable forming state. The average value of the tension change data (Ten) at the end of the current segment in the comparison data is less than the average value of the tension change data (Ten) at the end of the subsequent segment in the comparison data. The average value of the linear velocity change data (Vel) in the final segment of the comparison data in the first segment is greater than or equal to the average value of the linear velocity change data (Vel) in the final segment of the comparison data in the second segment. Furthermore, if the average decrease in the final section diameter change data Dia in the preceding comparison data is greater than the average decrease in the final section diameter change data Dia in the following comparison data, then the current final stretching final section forming state is determined to be a state of continuous stress accumulation. When the direction of change of the final tension data Ten between two adjacent sets of data records in the status recognition window Win changes alternately two or more times; If the direction of change of the final segment linear velocity data Vel between two adjacent sets of data records alternates two or more times; and the difference between the maximum and minimum values ​​of the final segment wire diameter change data Dia exceeds the preset wire diameter range, the current final drawing final segment forming state is determined to be a fluctuation amplification state. The determined stable forming state, stress accumulation state, or fluctuation amplification state are written into the final state result Sta.

6. The precision wire drawing collaborative control method based on ultra-fine tungsten wire preparation according to claim 5, characterized in that: S3 includes S31; S31. Read the final state result Sta, and divide the last three passes of the final pull into the first final segment, the second final segment, and the third final segment in sequence. The heat input adjustment for the last three passes of the final drawing is achieved by adjusting the temperature zone setting value corresponding to the final stage of the final drawing. The temperature zone setting value includes the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb. When the final state result Sta indicates that the current final stretch forming state is a stable forming state, the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the first final stretch are set to the first heat input level. Set the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the second end section to the second heat input level; Set the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the third end section to the third heat input level; Among them, the second heat input level is higher than the first heat input level, and the third heat input level is lower than the second heat input level; When the final state result Sta indicates that the current final stretching and forming state is a state of continuous stress accumulation, the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the first final stage are kept at the first heat input level. Adjust the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the second end section to the fourth heat input level; The first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the third end section are adjusted to the third heat input level, wherein the fourth heat input level is higher than the second heat input level; When the final state result Sta indicates that the current final stretch forming state is a fluctuation amplification state, the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the first final stage are kept at the first heat input level; the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the second final stage are adjusted to the fifth heat input level. The first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the third end section are adjusted to the third heat input level, wherein the fifth heat input level is higher than the fourth heat input level; Record the temperature zone settings corresponding to each terminal segment in the order of the first, second, and third terminal segments to form the terminal segment path result Pat.

7. The precision wire drawing collaborative control method based on ultra-fine tungsten wire preparation according to claim 6, characterized in that: S3 further includes S32; S32. Based on the final path result Pat, perform temperature zone control on the last three final pulls. In the first final segment, according to the temperature zone setting value corresponding to the first final segment in the final segment path result Pat, adjust the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb to make the first final segment a low heat input entry segment. In the second final segment, according to the temperature zone setting value corresponding to the second final segment in the final segment path result Pat, adjust the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb to make the second final segment a controlled micro-heat input peak-shaving segment. In the third final stage, according to the temperature zone setting value corresponding to the third final stage in the final stage path result Pat, adjust the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb to make the third final stage form a low heat input steady-state transition stage. After completing the temperature zone control for the first, second, and third final stages, record the temperature zone adjustment results for the last three final pulls in the execution order to form the final stage thermal history result Htp.

8. The precision wire drawing collaborative control method based on ultra-fine tungsten wire preparation according to claim 7, characterized in that: S4 includes S41; S41. Read the final thermal history result Htp and determine the running interval between the end position of the third final stage and the start position of the final shaping pass as the short-range tempering processing interval. Based on the temperature zone adjustment results corresponding to the third final stage in the final thermal history result Htp, determine the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the short-path tempering treatment interval. The first temperature zone setting data Tmpa corresponding to the short-range tempering treatment interval is greater than the first temperature zone setting data Tmpa corresponding to the third end segment, the second temperature zone setting data Tmpb corresponding to the short-range tempering treatment interval is greater than the second temperature zone setting data Tmpb corresponding to the third end segment, and both the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the short-range tempering treatment interval are within the preset recrystallization damage threshold range. The first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb corresponding to the short-range tempering treatment interval are integrated with the short-range tempering treatment interval to form the short-range tempering setting result Ann.

9. The precision wire drawing collaborative control method based on ultra-fine tungsten wire preparation according to claim 8, characterized in that: S4 also includes S42; S42. When the ultrafine tungsten wire reaches the short-range tempering treatment zone, the first temperature zone setting data Tmpa and the second temperature zone setting data Tmpb recorded in the short-range tempering setting result Ann are called up and written into the first temperature zone control unit and the second temperature zone control unit respectively, so that the ultrafine tungsten wire completes one continuous heating treatment in the short-range tempering treatment zone.

10. A precision wire drawing collaborative control system based on ultra-fine tungsten wire, applied to the precision wire drawing collaborative control method based on ultra-fine tungsten wire as described in any one of claims 1 to 9, characterized in that: It includes a tungsten filament drawing stage data acquisition module, a drawing state identification module, a hot zone rearrangement module, and a short-range processing module; Before the ultra-fine tungsten wire enters the final three stages of final drawing, the data acquisition module of the tungsten wire drawing stage collects the following data: end tension change data Ten, end linear velocity change data Vel, pay end winding diameter change data Pay, take-up end winding diameter change data Tak, first temperature zone setting data Tmpa, second temperature zone setting data Tmpb, and end wire diameter change data Dia. The data is then integrated to form the end input dataset Inp. The wire drawing state recognition module identifies the current final drawing state based on the final input dataset Inp and generates the final state result Sta. The thermal process rearrangement module performs thermal process rearrangement on the last three passes of the final pull according to the final state result Sta, so that the last three passes of the final pull sequentially form a low heat input entry section, a controlled micro-increase heat input peak clipping section, and a relatively low heat input steady-state transition section, which together form the final thermal process result Htp. The short-path processing module performs short-path tempering on the ultra-fine tungsten wire after the third final stage corresponding to the final thermal history result Htp, and before entering the final shaping stage, to reduce the residual stress in the final stage and generate the short-path processing result Tmp.

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