A process for re-treating the surface coating of enameled wire

Abstract

This invention discloses a re-treatment process for the surface coating of enameled wire, relating to the field of enameled wire production. The process includes screening waste enameled wire, decoating the waste enameled wire, drawing copper wire, and wire processing. Specifically, the decoating step involves passing the waste enameled wire through a first drawing die with its ends flipped. The input diameter of the first drawing die is smaller than its output diameter. The first drawing die has decoating holes with the same diameter as the copper wire in the waste enameled wire. The first drawing die decoats the waste enameled wire to obtain copper wire. The drawing step involves placing a second drawing die in its initial state, with its input diameter larger than its output diameter. The copper wire is drawn through the second drawing die, and then extruded and drawn through multiple second drawing dies with progressively smaller output diameters to obtain the wire. This application provides a low-cost process for removing the surface coating from enameled wire and recycling copper wire.

Description

Technical Field

[0001] This invention relates to the field of enameled wire production, and in particular to a process for re-treating the surface coating of enameled wire. Background Technology

[0002] Enameled wire is a major raw material for products such as motors, electrical appliances, and household appliances. It is a major type of winding assembly, consisting of two parts: a conductor and an insulation layer. Enameled wire is made by annealing and softening bare wire, followed by multiple coatings and baking processes.

[0003] During the production of enameled wire, sometimes substandard enameled wire is produced. This can be due to factors such as inappropriate production line process settings or substandard enamel quality, resulting in defects in the enamel film, such as bubbles and putty. This is called waste enameled wire and needs to be recycled. Recycling enameled wire involves removing the enamel film from the surface of the waste wire and reusing the copper wire as a raw material.

[0004] Common methods for removing the enamel coating from enameled wire include pyrolysis, solution cleaning, or mechanical removal. The production process of enameled wire includes raw material preparation, drawing, cleaning, annealing, cooling, enamel coating and baking, lubrication, and winding. Current methods for recycling enameled wire often require specialized recycling equipment and enamel stripping devices, which are costly. Summary of the Invention

[0005] In order to provide a low-cost process for removing the enamel film from the surface of enameled wire and recycling the copper wire, this application provides a process for re-treating the enamel film on the surface of enameled wire.

[0006] The proposed re-treatment process for the surface coating of enameled wire adopts the following technical solution:

[0007] A re-treatment process for the surface coating of enameled wire includes the following steps:

[0008] 1) Steps for screening waste enameled wire:

[0009] The surface-coated and baked-cured wires are inspected for quality. The wires are passed through the quality inspection components. Wires with defects in the coating film cannot pass the quality inspection components and are screened out. Together with the discarded enameled wires after use, they form waste enameled wires.

[0010] 2) Steps for stripping the enameled wire:

[0011] Waste enameled wire is passed through a first drawing die with its two ends flipped. The diameter of the input end of the first drawing die after flipping is smaller than the diameter of the output end. The first drawing die is provided with a stripping hole with the same diameter as the copper wire of the waste enameled wire. The first drawing die strips the copper wire of the waste enameled wire to obtain copper wire.

[0012] 3) Copper wire drawing steps:

[0013] The second drawing die is placed in its initial state. The diameter of the input end of the second drawing die is larger than the diameter of the output end. The copper wire is drawn through the second drawing die. The copper wire is extruded and drawn by multiple second drawing dies with successively smaller output end diameters to obtain wire.

[0014] 4) Wire processing steps:

[0015] After extrusion and drawing, the wire undergoes further processing. The re-coated wire is then inspected for quality. Products that fail the quality inspection are removed and the above steps are repeated. Wires that pass the quality inspection are coated with lubricant and then wound up to obtain enameled wire for storage.

[0016] By adopting the above technical solution, the quality inspection component can screen wires with defects in the enamel film, thereby obtaining waste enameled wire. By flipping the original drawing die in the enameled wire production, the presence of the paint stripping hole creates a blade-like effect, allowing the flipped first drawing die to scrape off the surface enamel of the waste enameled wire, obtaining the internal copper wire. The internal copper wire can then be extruded and drawn through the second drawing die placed in the initial state, and further processed through painting and other steps, thereby achieving the removal of the surface enamel film of the waste enameled wire and the recycling of the internal copper wire.

[0017] By flipping the wire drawing die, it can perform both wire drawing and paint removal functions simultaneously. No additional paint removal or recycling equipment is needed when removing the surface paint film, resulting in lower production costs.

[0018] Optionally, the quality inspection component includes a detection tube and an energized guide wheel. The enameled wire passes through the detection tube and then through the energized guide wheel. The detection tube is used to detect wires with bubbles or putty in the enamel film, and the energized guide wheel is used to detect wires with delamination or bare wires in the enamel film.

[0019] By adopting the above technical solution, the presence of the detection tube and the energized guide wheel allows for different aspects of wire inspection, enabling the screening of wires with bubbles, putty, bare wires, and broken enamel films, thus increasing the likelihood of defective products being screened out.

[0020] Optionally, in steps 2) and 3), both the first drawing die and the second drawing die are placed in the drawing machine. The drawing machine pulls the waste enameled wire through the first drawing die and through the paint removal hole to remove the paint. The drawing machine pulls the copper wire through the second drawing die to achieve extrusion drawing.

[0021] By adopting the above technical solution, the waste enameled wire is conveyed by the wire drawing machine, thereby connecting the deenamelting step and the wire drawing step of the waste enameled wire, saving space and site.

[0022] Optionally, in step 2), a guide sleeve is connected to the front of the first wire drawing die with both ends flipped. The diameter of the guide sleeve gradually decreases along the conveying direction of the waste enameled wire, the diameter of the input end of the first wire drawing die gradually decreases along the direction close to the paint stripping hole, and the diameter of the output end of the first wire drawing die gradually increases along the direction away from the paint stripping hole.

[0023] By adopting the above technical solution, the guide sleeve facilitates the passage of waste enameled wire through the guide sleeve and into the first drawing die, which plays a guiding role in the conveying of waste enameled wire. The first drawing die forms a blade at the paint stripping hole by changing the diameter, so that the surface paint film can be smoothly removed when passing through the paint stripping hole. Similarly, in the original state, the first drawing die can achieve a good drawing effect by setting the diameter.

[0024] Optionally, the output end of the first wire drawing die is divided into an output section and an extension section. Let the length of the paint stripping hole be l1, the diameter of the paint stripping hole be d, the length of the output section be l2, and the length of the extension section be l3, then:

[0025] l1=(0.2-0.4)·d, l2=1-(1.3-1.5)·d, l3=(0.5-0.8)·d.

[0026] By adopting the above technical solution, and by limiting the length, the ratio of the length to the diameter of the paint stripping hole makes the paint stripping hole relatively thin, increasing the sharpness similar to a knife tip, which facilitates paint stripping; by setting output ends and extension sections with different diameters at the output end, the first wire drawing die can achieve high wire smoothness and low wire breakage rate during wire drawing.

[0027] Optionally, in step 3), the diameter of the input end of the second drawing die is equal to the diameter of the paint stripping hole. When drawing the copper wire, the copper wire is first stretched to a diameter of 2.5-4 times the final wire diameter at a speed of 500-600 m / min, and then stretched to a diameter of the final wire diameter at a speed of 850-950 m / min.

[0028] By adopting the above technical solution, the copper wire is stretched to its final diameter through two drawing processes, which improves the tensile strength and other performance indicators of the produced enameled wire, ensuring that the enameled wire can meet the application requirements.

[0029] Optionally, the detection tube includes a middle working area and two sizing areas at both ends. The inner diameter of the working area is smaller than the inner diameter of the sizing area, and the outer diameter of the sizing area is larger than the outer diameter of the working area. The detection tube is placed on a support frame, which has multiple support grooves, and the working area is inserted into the support grooves.

[0030] By adopting the above technical solution, when the enameled wire passes through the testing tube, the inner diameter of the working area is the same as the diameter of the enameled wire. When defects such as air bubbles or putty are present on the enameled wire, the diameter of the enameled wire is larger than the inner diameter of the working area, and the enameled wire cannot pass through the testing tube, thus becoming a defective product. The matching of the support groove and the working area facilitates the placement of the testing tube on the support frame.

[0031] Optionally, the energized guide wheel is placed on a tube rack, the tube rack is provided with a mounting tube, the energized guide wheel is connected to the mounting tube by a clamp, the energized guide wheel is electrically connected to an energizing sensor, and the tube rack is connected to a power source for energizing the energized guide wheel.

[0032] By adopting the above technical solution, the power source provides power to the energized guide wheel. When the enameled wire has bare wire or a broken enamel film, due to insufficient insulation performance, the enameled wire will connect with the energized guide wheel to generate current. The energized sensor will display an alarm, thereby screening out unqualified products.

[0033] Optionally, subsequent processing includes the following steps:

[0034] Cleaning: Clean the wire obtained from drawing to remove oil and particles from the surface of the wire;

[0035] Annealing and cooling: The cleaned wire is annealed and then cooled.

[0036] Coating and baking: The wire is coated with paint multiple times and then baked to cure.

[0037] By adopting the above technical solution and setting the processing steps, the production of enameled wire is realized, the conductivity and mechanical properties of the enameled wire are improved, and the usage requirements are met.

[0038] In summary, this application has at least one of the following beneficial effects:

[0039] 1. The quality inspection component can screen wires with defects in the enamel film, thereby obtaining waste enameled wire. By flipping the original drawing die in the enameled wire production process, the presence of the paint stripping hole creates a blade-like effect, allowing the flipped first drawing die to scrape off the surface enamel of the waste enameled wire, obtaining the internal copper wire. The internal copper wire can then be extruded and drawn through the second drawing die placed in the initial state, and further processed through painting and other steps, thereby achieving the removal of the surface enamel film of the waste enameled wire and the recycling of the internal copper wire.

[0040] 2. By flipping the wire drawing die, the wire drawing die can perform both wire drawing and paint removal functions at the same time. When removing the surface paint film, no additional paint removal or recycling equipment is needed, resulting in lower production costs.

[0041] 3. The ratio of the length to the diameter of the paint stripping hole makes the area at the paint stripping hole relatively thin, increasing the sharpness similar to a knife tip, which facilitates paint stripping; the output end is set with output ends and extension sections with different diameters, so that the first wire drawing die has a high degree of wire smoothness and a low wire breakage rate when drawing wire. Attached Figure Description

[0042] Figure 1 This is a flowchart of the re-treatment process for the enameled wire surface coating in this application;

[0043] Figure 2 This is a schematic diagram of the enameled wire production apparatus of this application;

[0044] Figure 3 This is a structural schematic diagram of the quality inspection component for the enameled wire in this application;

[0045] Figure 4 This is a schematic diagram of the enameled wire stripping device and copper wire drawing device of this application;

[0046] Figure 5 This is a cross-sectional schematic diagram of the enameled wire stripping device and the copper wire drawing device of this application;

[0047] Figure 6 This is a cross-sectional schematic diagram of the first wire drawing die of this application.

[0048] Explanation of reference numerals in the attached figures:

[0049] 1. Unwinding mechanism; 11. Wire drawing mechanism; 12. Coating and drying mechanism; 13. Rewinding mechanism; 2. Quality inspection components; 21. Support frame; 22. Support groove; 3. Inspection tube; 31. Sizing area; 32. Working area; 4. Tube rack; 41. Placement tube; 42. Clamp; 43. Power-conducting guide wheel; 5. First wire drawing die; 51. Input end; 52. Paint stripping hole; 53. Output end; 531. Output section; 532. Extension section; 6. Guide sleeve; 7. Second wire drawing die; 71. Wire drawing machine; Detailed Implementation

[0050] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0051] This application discloses a process for re-treating the surface coating of enameled wire. (Refer to...) Figure 1 A process for re-treating the surface coating of enameled wire includes the following steps:

[0052] 1) Steps for screening waste enameled wire:

[0053] The waste enameled wire in this application consists of two parts: defective products produced during production and enameled wire discarded after use. During production, due to factors such as paint quality and coating process, some enameled wires with unqualified paint film will be produced. At this time, the unqualified enameled wires cannot continue to be stored and sold, and the paint film should be removed and then reprocessed for production.

[0054] The production of enameled wire can be divided into the following steps: raw material preparation, wire drawing, cleaning, annealing, cooling, coating, and baking. (Refer to...) Figure 2 The specific production process and equipment for enameled wire are as follows:

[0055] Raw material preparation: Prepare copper material as raw material. The copper material is industrial pure copper with a purity of 99.95% or higher and a conductivity of not less than 98%. When preparing the copper material, it is necessary to check whether its dimensions are within the tolerance range and ensure that the copper material is free from defects such as oxidation, burrs, and cracks.

[0056] Wire drawing: The copper wire is conveyed by the unwinding mechanism 1 and passed through the wire drawing mechanism 11. Multiple wire drawing dies are used to extrude and draw the copper wire until it reaches the final diameter.

[0057] Cleaning: The copper material after wire drawing is cleaned to remove oil and particles from the surface;

[0058] Annealing: The cleaned copper material is placed in an annealing furnace for annealing treatment;

[0059] Cooling: Cooling the annealed copper material;

[0060] Painting and baking: The copper material is painted using the painting and drying unit 12. After painting, it is baked and cured to obtain enameled wire.

[0061] After the enameled wire undergoes coating and baking, it is subjected to a quality inspection process. The enameled wire passes through quality inspection component 2, while wires with defects in the coating film fail to pass through. Therefore, quality inspection can screen out unqualified enameled wires, which, together with the discarded enameled wires after use, constitute waste enameled wire.

[0062] Reference Figure 3The quality inspection component 2 specifically includes a detection tube 3 and an energized guide wheel 43. The enameled wire first passes through the detection tube 3 and then through the energized guide wheel 43. The detection tube 3 includes a working area 32 and a sizing area 31. The working area 32 is located in the middle of the detection tube 3, and the sizing area 31 connects to both ends of the working area 32. The outer diameter of the sizing area 31 is larger than the outer diameter of the working area 32, and the inner diameter of the sizing area 31 is larger than the outer diameter of the working area 32. When the enameled wire passes through the detection tube 3, it first passes through the sizing area 31 and then through the working area 32. The diameter of the working area 32 is the sum of the diameters of the enameled wire (i.e., the copper wire and the enamel film). If the enamel film of the enameled wire has defects such as bubbles or putty, the diameter of the enameled wire is larger than the inner diameter of the working area 32. In this case, the enameled wire cannot pass through the detection tube 3 and becomes a defective product. The test tube 3 is placed on the support frame 21, which has multiple support grooves 22 that extend to one side of the support frame 21. The working area 32 of the test tube 3 is inserted into the support groove 22, and the sizing area 31 is located above the support groove 22, thus realizing the placement of the test tube 3.

[0063] The energized guide wheel 43 is placed on the tube rack 4, which includes a horizontally placed mounting tube 41 located above the support frame 21. The energized guide wheel 43 is connected to the mounting tube 41 via a clamp 42, thus installing the energized guide wheel 43. A power supply is provided on the tube rack 4, which is connected to the energized guide wheel 43 to charge it. The energized guide wheel 43 is electrically connected to an energizing sensor. When the enameled wire has bare wire or enamel film breaks, the insulation performance of the enameled wire is poor. When it passes through the energized guide wheel 43, it will conduct electricity and generate current, thereby triggering an alarm from the energizing sensor. This allows the unqualified enameled wires with bare wire or enamel film breaks to be screened out.

[0064] 2) Steps for stripping the enameled wire:

[0065] The selected waste enameled wires are cleaned to expose the copper wires inside. The copper wires are then redrawn and re-coated to achieve copper wire recycling.

[0066] Reference Figure 4 and Figure 5 The device used in the paint stripping step is the first drawing die 5 with both ends flipped. The first drawing die 5 is originally used to extrude and draw copper wire. After flipping its two ends, the first drawing die 5 can strip the paint from the waste enameled wire to obtain the internal copper wire.

[0067] The first drawing die 5, after being flipped, includes an input end 51, a paint stripping hole 52, and an output end 53 arranged sequentially. The diameter of the input end 51 is smaller than the diameter of the output end 53, and the diameter of the paint stripping hole 52 is the same as the diameter of the copper wire inside the waste enameled wire. In the first drawing die 5, the diameter of the input end 51 gradually decreases along the direction approaching the paint stripping hole 52, while the diameter of the output end 53 gradually increases along the direction away from the paint stripping hole 52. This creates a blade-like effect at the paint stripping hole 52 by presenting a diameter that is narrow at first and then widens. When the waste enameled wire passes through the first drawing die 5, after reaching the paint stripping hole 52 from the input end 51, the surface enamel film is removed under the peeling action of the "blade" in the paint stripping hole 52. The internal copper wire passes through the paint stripping hole 52 and the output end 53, resulting in the stripped copper wire.

[0068] Reference Figure 6 In the first drawing die 5, let the length of the paint stripping hole 52 be l1 and the diameter of the paint stripping hole 52 be d, then:

[0069] l1=(0.2-0.4)·d, by setting the ratio of the length and diameter of the paint stripping hole 52, the first drawing die 5 is thinner at the paint stripping hole 52, forming a sharp blade tip at the paint stripping hole 52, which improves the effect of removing the surface paint film of the waste enameled wire.

[0070] When the first drawing die 5 is placed normally in its original state, it can be used to draw copper wire. At this time, the diameter of the front end of the first drawing die 5 is larger than the diameter of the rear end. To achieve a better drawing effect, the output end 53 of the first drawing die 5 is divided into two parts: an output section 531 and an extension section 532. The inclination degrees of the diameters of the output section 531 and the extension section 532 are different. Let the length of the output end 53 be l2 and the length of the extension section 532 be l3, then:

[0071] l2=1-(1.3-1.5)·d, l3=(0.5-0.8)·d.

[0072] By adjusting the lengths of the output section 531 and the extension section 532 to a specific ratio, the first wire drawing die 5 achieves a high wire smoothness and a low wire breakage rate when drawing copper wire. By flipping the wire drawing die, it can simultaneously perform both wire drawing and paint removal functions.

[0073] A guide sleeve 6 is provided in front of the first drawing die 5, which flips at both ends. The guide sleeve 6 is flared and its diameter gradually decreases along the conveying direction of the waste enameled wire. The guide sleeve 6 is used to guide the conveying of the waste enameled wire and facilitate the waste enameled wire to enter the first drawing die 5.

[0074] 3) Copper wire drawing steps:

[0075] Waste enameled wire is stripped of its enamel coating to obtain the inner copper wire. This copper wire can then be drawn to produce wires with smaller diameters. These wires can be recycled and re-enameled to form new enameled wires.

[0076] During copper wire drawing, the copper wire is first stretched at a speed of 500-600 m / min to a diameter 2.5-4 times the final wire diameter, and then stretched again at a speed of 850-950 m / min to the final wire diameter. This two-stage drawing process improves the mechanical properties of the wire. Tests show that the tensile strength and elongation at break of the wire are improved after stretching.

[0077] Reference Figure 4 and Figure 5 For drawing copper wire, a second drawing die 7 is used. The second drawing die 7 is set in its initial state, with the input diameter larger than the output diameter. The overall structure and proportions of the second drawing die 7 are the same as those of the first drawing die 5, still including an input end 51, a paint stripping hole 52, an output section 531, and an extension section 532. However, its placement is reversed compared to the first drawing die 5 during paint stripping. At this time, the port where the copper wire enters the second drawing die 7 (the input end of the second drawing die 7) is on the side of the output end 53 of the first drawing die 5, and the port where the copper wire extends out of the second drawing die 7 (the output end of the second drawing die 7) is on the side of the input end 51 of the first drawing die 5.

[0078] The difference between the second drawing die 7 and the first drawing die 5 lies in their diameters. The purpose of the first drawing die 5 is to remove the paint, so the diameter of the paint removal hole 52 is set to the diameter of the copper wire. Only the internal copper wire can pass through the paint removal hole 52 and the output end 53. The purpose of the second drawing die 7 is to extrude and draw wire. The diameter of the input end is set to the diameter of the paint removal hole 52 of the first drawing die 5, which is the diameter of the copper wire. The copper wire enters the second drawing die 7. As the diameter from the input end of the second drawing die 7 to the paint removal hole 52 decreases, the diameter of the copper wire also decreases to achieve wire drawing.

[0079] Appendix Figure 4 Only one second drawing die 7 is shown in the diagram. In actual production, the second drawing die 7 contains multiple drawing dies with different diameters. Through multiple drawing dies arranged sequentially with decreasing diameters, the diameter of the copper wire gradually decreases to the final diameter. The length relationship between d, l1, l2, and l3 in the second drawing die 7 still exists, thus achieving high wire smoothness and low wire breakage rate through the second drawing die.

[0080] In production, both the first drawing die 5 and the second drawing die 7 are placed in the drawing machine 71. The drawing machine 71 pulls the waste enameled wire through the first drawing die 5 and then through the second drawing die 7. In the first drawing die 5, the waste enameled wire passes through the stripping hole 52 to remove the enamel coating. The resulting copper wire continues to be drawn through the second drawing die 7 by the pulling force of the drawing machine 71. The drawing machine 71 connects the stripping step of the waste enameled wire and the drawing step of the copper wire, saving space and area.

[0081] 4) Wire processing steps:

[0082] After drawing, the wire undergoes further processing to obtain new enameled wire. This subsequent processing follows the same technology and equipment as the production of enameled wire. (Refer to...) Figure 2 Specifically, it includes the following steps:

[0083] Cleaning: Clean the wire obtained from drawing to remove oil and particles from the surface of the wire;

[0084] Annealing and cooling: The cleaned wire is annealed and then cooled.

[0085] Coating and baking: The wire is coated with paint multiple times and then baked to cure.

[0086] The new enameled wire continues to undergo quality inspection. Products that fail the quality inspection are picked out and the above steps are repeated. Wires that pass the quality inspection are coated with lubricant and wound up by winding mechanism 13 to obtain enameled wires which are then placed in a warehouse for storage, thus completing the recycling and reprocessing of waste enameled wires.

[0087] The implementation principle of the surface coating re-treatment process for enameled wire in this application embodiment is as follows:

[0088] The wire is coated and baked to obtain enameled wire. The enameled wire is inspected for quality. Wire with bubbles or putty in the coating film cannot pass the test tube 3. Wire with broken coating film or bare wire cannot pass the current guide wheel 43. The unqualified products and the enameled wire discarded after use are selected to form waste enameled wire.

[0089] The wire drawing machine 71 drives the enameled wire to be conveyed. After passing through the guide sleeve 6, the enameled wire enters the first wire drawing die 5 with both ends flipped. When passing through the paint stripping hole 52, the paint is stripped to obtain the internal copper wire. The internal copper wire passes through the paint stripping hole 52 and the output end 53 and enters the second wire drawing die 7. The copper wire is drawn to the final diameter by the diameter change of the second wire drawing die 7 to obtain the wire.

[0090] The process involves cleaning, annealing and cooling, coating and baking the wire. After passing quality inspection, lubricant is applied to the enameled wire, which is then wound up and stored. This completes the removal of surface varnish from waste enameled wire and the recycling and reprocessing of copper wire. This specific embodiment is merely an explanation of this application and is not intended to limit it. Those skilled in the art can make modifications to this specific embodiment without contributing any inventive step after reading this specification, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A process for re-treating the surface coating of enameled wire, characterized in that, Includes the following steps: 1) Steps for screening waste enameled wire: The enameled wires that have been coated and baked and cured are inspected. The wires are passed through the inspection component (2). The inspection component (2) includes a detection tube (3) and an electric guide wheel (43). The enameled wires pass through the detection tube (3) and then through the electric guide wheel (43). The detection tube (3) is used to detect wires with bubbles or putty in the coating. The electric guide wheel (43) is used to detect wires with broken coatings or bare wires. Wires with defects in the coating cannot pass through the inspection component (2). They are screened out and together with the enameled wires that are discarded after use, they form waste enameled wires. The detection tube (3) includes a middle working area (32) and two sizing areas (31) at both ends. The inner diameter of the working area (32) is smaller than the inner diameter of the sizing area (31), and the outer diameter of the sizing area (31) is larger than the outer diameter of the working area (32). The detection tube (3) is placed on a support frame (21), and the support frame (21) has multiple support grooves (22). The working area (32) is inserted into the support grooves (22). 2) Steps for stripping the enameled wire: Waste enameled wire is passed through a first drawing die (5) with its two ends flipped. The diameter of the input end (51) of the first drawing die (5) after flipping is smaller than the diameter of the output end (53). The first drawing die (5) is provided with a paint removal hole (52) with the same diameter as the copper wire of the waste enameled wire. The first drawing die (5) is placed in a drawing machine (71). The waste enameled wire is driven through the first drawing die (5) by the pulling force of the drawing machine (71) and passes through the paint removal hole (52) to remove the paint and obtain copper wire. The output end (53) of the first wire drawing die (5) is divided into an output section (531) and an extension section (532). Let the length of the paint stripping hole (52) be l1, the diameter of the paint stripping hole (52) be d, the length of the output section (531) be l2, and the length of the extension section (532) be l3, then: l1=(0.2-0.4)·d, l2=1-(1.3-1.5)·d, l3=(0.5-0.8)·d; 3) Copper wire drawing steps: The second wire drawing die (7) is placed in the initial state. The diameter of the input end of the second wire drawing die (7) is larger than the diameter of the output end. The second wire drawing dies (7) are all placed in the wire drawing machine (71). The copper wire is driven through the second wire drawing die (7) by the pulling force of the wire drawing machine (71) to achieve extrusion drawing. The copper wire is extruded and drawn by multiple second wire drawing dies (7) with successively smaller output end diameters to obtain wire. 4) Wire processing steps: After extrusion and drawing, the wire undergoes further processing. The re-coated wire is then inspected for quality. Products that fail the quality inspection are removed and the above steps are repeated. Wires that pass the quality inspection are coated with lubricant and then wound up to obtain enameled wire for storage.

2. The re-treatment process for the surface coating of enameled wire according to claim 1, characterized in that: In step 2), a guide sleeve (6) is connected to the front of the first wire drawing die (5) which is flipped at both ends. The diameter of the guide sleeve (6) gradually decreases along the conveying direction of the waste enameled wire. The diameter of the input end (51) of the first wire drawing die (5) gradually decreases along the direction close to the paint stripping hole (52). The diameter of the output end (53) of the first wire drawing die (5) gradually increases along the direction away from the paint stripping hole (52).

3. The re-treatment process for the surface coating of enameled wire according to claim 1, characterized in that: In step 3), the diameter of the input end of the second drawing die (7) is equal to the diameter of the paint stripping hole (52). When the copper wire is drawn, it is first stretched to a diameter of 2.5-4 times the final wire size at a speed of 500-600 m / min, and then stretched to a diameter of the final wire size at a speed of 850-950 m / min.

4. The surface coating retreatment process for enameled wire according to claim 1, characterized in that: The energized guide wheel (43) is placed on the tube rack (4), the tube rack (4) is provided with a mounting tube (41), the energized guide wheel (43) is connected to the mounting tube (41) through a clamp (42), the energized guide wheel (43) is electrically connected to an energizing sensor, and the tube rack (4) is connected to a power source for energizing the energized guide wheel (43).

5. The re-treatment process for the surface coating of enameled wire according to claim 1, characterized in that: In step 4), subsequent processing includes the following steps: Cleaning: Clean the wire obtained from drawing to remove oil and particles from the surface of the wire; Annealing and cooling: The cleaned wire is annealed and then cooled. Coating and baking: The wire is coated with paint multiple times and then baked to cure.

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