A continuous annealing copper wire drawing machine and its annealing method

Abstract

This invention discloses a continuous annealing copper wire drawing machine and its annealing method, relating to the field of copper wire drawing technology. The machine includes an annealing machine with a first fixed plate fixedly connected to the bottom of its inner cavity. A second fixed plate is fixedly connected to the bottom of the inner cavity of the annealing machine and to one side of the first fixed plate. This continuous annealing copper wire drawing machine and its annealing method can actively extract the high-temperature steam generated during the cooling of the copper wire and introduce it into the internal flow channels of the first and second preheating rollers. When the steam flows within the flow channels, its heat is efficiently conducted to the roller surface through the heat-conducting roller body, thereby fully preheating the copper wire passing over the roller surface. This converts the originally wasted steam waste heat into effective preheating energy, significantly reducing the heating energy consumption required for subsequent electrode roller annealing, improving overall energy utilization efficiency, and demonstrating outstanding economic and environmental benefits.

Description

Technical Field

[0001] This invention relates to the field of copper wire drawing technology, specifically to a continuous annealing copper wire drawing machine and its annealing method. Background Technology

[0002] Continuous annealing copper wire drawing machines are key equipment in the modern wire, cable, and magnet wire industry. They integrate copper wire drawing and diameter reduction with online annealing heat treatment (softening) into a single continuous process to achieve high-efficiency production. The core process typically includes: the copper wire is drawn to the target diameter through multiple drawing dies, then subjected to resistance heating annealing via electrode rollers and other devices, followed by immediate immersion in a water bath for rapid cooling to fix its soft properties, and finally dried and wound up.

[0003] Although existing equipment has achieved continuous production, the following significant shortcomings remain in terms of energy utilization, process stability, and equipment design: In existing technologies, when high-temperature copper wire heated to several hundred degrees Celsius by electrode rollers enters a cooling water tank, a large amount of high-temperature steam is generated. This steam is usually released directly into the environment without any treatment, resulting in the significant waste of its contained thermal energy (i.e., a large portion of the annealing energy consumption). This not only increases production costs but also leads to low energy efficiency, which is inconsistent with current green manufacturing and energy conservation and emission reduction guidelines. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a continuous annealing copper wire drawing machine and its annealing method, solving the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a continuous annealing copper wire drawing machine, comprising an annealing machine, wherein a first fixing plate is fixedly connected to the bottom of the inner cavity of the annealing machine, and a second fixing plate is fixedly connected to the bottom of the inner cavity of the annealing machine and to one side of the first fixing plate; a first preheating roller is rotatably connected to one side of the first fixing plate via bearings, and a second preheating roller is rotatably connected to one side of the second fixing plate via bearings; a first rotary joint is installed on one side of the first fixing plate, and a second rotary joint is installed on one side of the second fixing plate; a fixing box is fixedly connected to the back of the annealing machine, and a third rotary joint is installed on one side of the inner cavity of the fixing box. A fourth rotary joint is installed on one side of the inner cavity of the fixed box and to the right of the third rotary joint. The two ends of the first preheating roller are respectively connected to one end of the first rotary joint and one end of the third rotary joint. The two ends of the second preheating roller are respectively connected to one end of the second rotary joint and one end of the fourth rotary joint. A discharge pipe is installed at the other end of the third rotary joint, and one end of the discharge pipe extends to the outside of the fixed box. An inlet pipe is installed at the other end of the fourth rotary joint, and one end of the inlet pipe extends to the outside of the fixed box. Two electrode rollers are rotatably connected to the inner wall of the annealing machine. The first rotary joint and the second rotary joint are connected by a connecting pipe.

[0006] Preferably, a cooling box is fixedly connected to the bottom of the annealing machine cavity, a top cover is placed on the top of the cooling box, electric telescopic rods are fixedly connected to both sides of the cooling box, the telescopic ends of the electric telescopic rods are fixedly connected to the bottom of the top cover, and through slots are opened at both ends of the top of the cooling box and both ends of the bottom of the top cover.

[0007] Preferably, a sealing door is installed on the left side of the cooling box via a hinge shaft, and a threaded block is fixedly connected to the right end of the sealing door. A screw is threaded inside the threaded block, and a positioning block is fixedly connected to the right side of the cooling box and below the threaded block. The bottom end of the screw extends into the positioning block.

[0008] Preferably, a partition is fixedly connected to the bottom of the inner cavity of the cooling box, and a guide roller is rotatably connected to the back of the inner cavity of the cooling box.

[0009] Preferably, a pump is fixedly connected to the top of the annealing machine, a hose is fixedly connected to one end of the pump, the bottom end of the hose extends to the bottom of the top cover and is fixedly connected to a suction head, and the other end of the pump is connected to the other end of the inlet pipe.

[0010] Preferably, a drive box is fixedly connected to the back of the inner cavity of the cooling box. A screw is rotatably connected inside the drive box, and a push post is mounted on the outer side of the screw. The push post cooperates with the screw. One end of the push post extends to the outer side of the drive box and is fixedly connected to a mounting bracket. The mounting bracket and one side of the drive box are rotatably connected to rotating rollers via bearings. A sponge pad is wound around the outer side of each rotating roller. An adhesive layer is installed on the inner side of each sponge pad, and the sponge pad is adhered to the outer side of the rotating roller through the adhesive layer. A third motor is fixedly connected to one side of the cooling box, and the output end of the third motor is connected to one end of the screw.

[0011] Preferably, a liquid replenishment pipe is fixedly connected to the right side of the cooling box, and one end of the liquid replenishment pipe extends into the interior of the cooling box.

[0012] Preferably, a first motor is fixedly connected to the back of the fixed box, and a second motor is fixedly connected to the back of the fixed box and to the right of the first motor. The output ends of the second motor and the first motor both extend into the interior of the fixed box. The outer sides of the first preheating roller and the output end of the first motor are both fitted with meshing first gears, and the outer sides of the second preheating roller and the output end of the second motor are both fitted with meshing second gears.

[0013] A continuous annealing method includes the following steps: Step 1: The room temperature copper wire is first wound around the surface of the actively rotating preheating roller; Step 2: The preheated copper wire enters the annealing zone and passes continuously through the electrode roller. The electrode roller is supplied with a large current, and the copper wire is directly heated by its own resistance, so that it reaches the recrystallization temperature in a very short time and completes the main annealing (softening). Step 3: Immerse the annealed high-temperature copper wire in cooling water for quenching.

[0014] This invention provides a continuous annealing copper wire drawing machine and its annealing method, which has the following beneficial effects: 1. This continuous annealing copper wire drawing machine and its annealing method can actively extract the high-temperature steam generated during the cooling of the copper wire and introduce it into the internal flow channels of the first and second preheating rollers. As the steam flows within the flow channels, its heat is efficiently conducted to the roller surface through the heat-conducting roller body, thereby fully preheating the copper wire passing over the roller surface. This converts the originally wasted steam heat into effective preheating energy, significantly reducing the heating energy consumption required for subsequent electrode roller annealing, improving overall energy utilization efficiency, and demonstrating outstanding economic and environmental benefits.

[0015] 2. In this continuous annealing copper wire drawing machine and its annealing method, the first and second preheating rollers are actively rotated by a first motor and a second motor via a gear set. This ensures rolling contact between the preheating rollers and the copper wire, resulting in more uniform heat transfer and avoiding surface damage to the copper wire that may be caused by sliding friction. Active rotation ensures uniform circumferential heating of the copper wire. Combined with the double-roller preheating structure, this allows for a more thorough and stable temperature rise of the copper wire before entering the annealing zone, laying a solid foundation for subsequent uniform recrystallization of the annealed structure and improving the consistency of the mechanical and electrical properties of the final product. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the annealing machine part of the present invention; Figure 3 This is a top sectional view of the fixed box structure of the present invention; Figure 4 This is a schematic diagram of the rear view of the annealing machine of the present invention; Figure 5 This is a schematic diagram of the rear cross-sectional structure of the fixing box of the present invention; Figure 6 This is a schematic diagram of the cooling box structure from the right side of the present invention; Figure 7 This is a schematic diagram of the cooling box structure from the left side of the present invention; Figure 8 This is a schematic diagram of the structure of the cooling box of the present invention when the front opening is open; Figure 9 This is a schematic diagram of the drive box structure of the present invention; Figure 10 This is a schematic diagram of the rear cross-sectional structure of the drive box of the present invention; Figure 11 This is a schematic diagram of the structure when the sponge pad of the present invention is replaced.

[0017] In the diagram: 1. Annealing machine; 2. First fixed plate; 3. Second fixed plate; 4. First preheating roller; 5. Second preheating roller; 6. First rotary joint; 7. Second rotary joint; 8. Connecting pipe; 9. Fixing box; 10. Third rotary joint; 11. Fourth rotary joint; 12. First motor; 13. First gear; 14. Second motor; 15. Second gear; 16. Discharge pipe; 17. Inlet pipe; 18. Electrode roller; 19. 20. Cooling box; 21. Hinge shaft; 22. Sealed door; 23. Electric telescopic rod; 24. Top cover; 25. Through groove; 26. Hose; 27. Pump; 28. Partition plate; 29. ​​Guide roller; 30. Drive box; 31. Rotating roller; 32. Sponge pad; 33. Mounting bracket; 34. Screw; 35. Push column; 36. Third motor; 37. Adhesive layer; 38. Threaded block; 39. Screw; 40. Positioning block; 51. Liquid replenishment pipe. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] Example 1 Please see Figures 1 to 11 This invention provides a technical solution: a continuous annealing copper wire drawing machine, comprising an annealing machine 1, a first fixing plate 2 fixedly connected to the bottom of the inner cavity of the annealing machine 1, a second fixing plate 3 fixedly connected to the bottom of the inner cavity of the annealing machine 1 and located on one side of the first fixing plate 2, a first preheating roller 4 rotatably connected to one side of the first fixing plate 2 via bearings, a second preheating roller 5 rotatably connected to one side of the second fixing plate 3 via bearings, a first rotary joint 6 installed on one side of the first fixing plate 2, a second rotary joint 7 installed on one side of the second fixing plate 3, a fixing box 9 fixedly connected to the back of the annealing machine 1, a third rotary joint 10 installed on one side of the inner cavity of the fixing box 9, and a... A fourth rotary joint 11 is installed on the right side of the third rotary joint 10. The two ends of the first preheating roller 4 are respectively connected to one end of the first rotary joint 6 and one end of the third rotary joint 10. The two ends of the second preheating roller 5 are respectively connected to one end of the second rotary joint 7 and one end of the fourth rotary joint 11. A discharge pipe 16 is installed at the other end of the third rotary joint 10. One end of the discharge pipe 16 extends to the outside of the fixed box 9. An inlet pipe 17 is installed at the other end of the fourth rotary joint 11. One end of the inlet pipe 17 extends to the outside of the fixed box 9. Two electrode rollers 18 are rotatably connected to the inner wall of the annealing machine 1. The first rotary joint 6 and the second rotary joint 7 are connected by a connecting pipe 8.

[0020] The annealing machine 1 has a cooling box 19 fixedly connected to the bottom of its inner cavity. A top cover 23 is placed on the top of the cooling box 19. Electric telescopic rods 22 are fixedly connected to both sides of the cooling box 19. The telescopic ends of the electric telescopic rods 22 are fixedly connected to the bottom of the top cover 23. Through slots 24 are provided at both ends of the top of the cooling box 19 and at both ends of the bottom of the top cover 23. There is a certain gap between the through slots 24 and the copper wires so that a certain amount of air can enter the interior of the cooling box 19 through the gap between the through slots 24 and the copper wires.

[0021] A sealing door 21 is installed on the left side of the cooling box 19 via a hinge shaft 20. A threaded block 37 is fixedly connected to the right end of the sealing door 21. A screw 38 is threaded inside the threaded block 37. A positioning block 39 is fixedly connected to the right side of the cooling box 19 and below the threaded block 37. The bottom end of the screw 38 extends into the positioning block 39. The positioning block 39, the screw 38, and the threaded block 37 limit and fix the position of the sealing door 21.

[0022] The bottom of the inner cavity of the cooling box 19 is fixedly connected to a partition plate 27, and the back of the inner cavity of the cooling box 19 is rotatably connected to a guide roller 28. The copper wire is immersed in the cooling water at the bottom of the inner cavity of the cooling box 19 for cooling through the guide roller 28.

[0023] The annealing machine 1 is fixedly connected to the top of a pump 26. One end of the pump 26 is fixedly connected to a hose 25. The bottom end of the hose 25 extends to the bottom of the top cover 23 and is fixedly connected to a suction head. The other end of the pump 26 is connected to the other end of the inlet pipe 17. Through the hose 25, the telescopic end of the electric telescopic rod 22 can drive the top cover 23 to move up and down.

[0024] The cooling box 19 has a drive box 29 fixedly connected to the back of its inner cavity. A screw 33 is rotatably connected inside the drive box 29, and a push post 34 is mounted on the outside of the screw 33. The push post 34 cooperates with the screw 33. One end of the push post 34 extends to the outside of the drive box 29 and is fixedly connected to a mounting bracket 32. The mounting bracket 32 ​​and one side of the drive box 29 are rotatably connected to rotating rollers 30 through bearings. A sponge pad 31 is wound around the outside of each rotating roller 30. An adhesive layer 36 is installed on the inside of each sponge pad 31, and the sponge pad 31 is adhered to the outside of the rotating roller 30 through the adhesive layer 36. A third motor 35 is fixedly connected to one side of the cooling box 19. The output end of the third motor 35 is connected to one end of the screw 33. The sponge pad 31 is used to wipe off the residual cooling water on the copper wire.

[0025] The cooling tank 19 is fixedly connected to a liquid replenishment pipe 40 on its right side, and one end of the liquid replenishment pipe 40 extends into the interior of the cooling tank 19. Cooling water can be replenished to the cooling water body at the bottom of the inner cavity of the cooling tank 19 through the liquid replenishment pipe 40.

[0026] The first motor 12 is fixedly connected to the back of the fixed box 9, and the second motor 14 is fixedly connected to the back of the fixed box 9 and to the right of the first motor 12. The output ends of the second motor 14 and the first motor 12 both extend into the interior of the fixed box 9. The first preheating roller 4 and the output end of the first motor 12 are both fixedly fitted with meshing first gears 13, and the second preheating roller 5 and the output end of the second motor 14 are both fixedly fitted with meshing second gears 15, which can drive the first preheating roller 4 and the second preheating roller 5 to rotate, so that the outer sides of the first preheating roller 4 and the second preheating roller 5 come into contact with the copper wire.

[0027] Example 2 Please see Figures 1 to 11 The present invention provides a technical solution: a continuous annealing method, comprising the following steps: Step 1: The room temperature copper wire is first wound around the surface of the actively rotating preheating roller; Step 2: The preheated copper wire enters the annealing zone and passes continuously through the electrode roller. The electrode roller is supplied with a large current, and the copper wire is directly heated by its own resistance, so that it reaches the recrystallization temperature in a very short time and completes the main annealing (softening). Step 3: Immerse the annealed high-temperature copper wire in cooling water for quenching.

[0028] In summary, in use, the copper wire of the continuous annealing copper wire drawing machine and its annealing method is preheated by the first preheating roller 4 and the second preheating roller 5, heated by the electrode roller 18, and then guided by the guide roller 28 into the cooling water at the bottom of the cooling box 19 behind the partition plate 27 for cooling. After cooling, the copper wire is led out to the outside of the machine. When the cooling water cools the copper wire, steam is generated. The steam rises and is drawn into the pump 26 through the hose 25 and the suction head. Then, it is discharged into the inlet pipe 17 through the other end of the pump 26, into the fourth rotary joint 11, into the second preheating roller 5 through the fourth rotary joint 11, into the connecting pipe 8 through the second rotary joint 7, into the first rotary joint 6 through the connecting pipe 8, into the first preheating roller 4 through the first rotary joint 6, into the third rotary joint 10 through the first preheating roller 4, and finally discharged through the outlet pipe 16. When the steam flows inside the first preheating roller 4 and the second preheating roller 5, since both the first preheating roller 4 and the second preheating roller 5 are made of heat-conducting material, the temperature of the steam is conducted to the first preheating roller 4 and the second preheating roller 5. When the copper wire passes over the first preheating roller 4 and the second preheating roller 5, the copper wire is preheated. During the preheating of the copper wire, the output end of the first motor 12 drives a first gear 13 to rotate, and the other first gear 13 drives the first preheating roller 4 to rotate. The output end of the second motor 14 drives a second gear 15 to rotate, and the other second gear 15 drives the second preheating roller 5 to rotate, so that the outer sides of the first preheating roller 4 and the second preheating roller 5 are in uniform contact with the copper wire. When the copper wire is cooled inside the cooling box 19 and then discharged, the sponge pads 31 on the outside of the two rotating rollers 30 wipe and retain the residual water on the outside of the copper wire, so that the residual water flows into the cooling water body at the bottom of the inner cavity of the cooling box 19. The residual water can be replenished to the bottom of the inner cavity of the cooling box 19 through the replenishment pipe 40. When the copper wire needs to be replaced, the top cover 23 is pushed upward by the telescopic end of the electric telescopic rod 22. The bottom end of the screw 38 is unscrewed from inside the positioning block 39, and the sealing door 21 is opened by the handle on the surface of the sealing door 21. This causes the sealing door 21 to rotate the hinge shaft 20, opening the front opening of the cooling box 19. Then, the output end of the third motor 35 drives the screw 33 to rotate, causing the screw 33 to drive the push column 34, the mounting bracket 32, a rotating roller 30, and the sponge pad 31 to move to the left. Then, the sponge pad 31 is peeled off from the outside of the rotating roller 30, and a new sponge pad 31 is attached to the outside of the rotating roller 30 through the adhesive layer 36. Then, the copper wire is guided into the interior of the cooling box 19 and out to the outside of the cooling box 19. Then, the output end of the third motor 35 drives the screw 33 to reset and rotate, so that the screw 33 drives the push column 34, the mounting bracket 32, and the left rotating roller 30 and the sponge pad 31 to move to the right. Then, the telescopic end of the electric telescopic rod 22 drives the top cover 23 to move down, so that the copper wire is located between the top cover 23 and the two through slots 24 on the cooling box 19. Then, the sealing door 21 is reset and rotated by the handle, so that the sealing door 21 closes the front opening of the cooling box 19. Then, the bottom end of the screw 38 is screwed into the positioning block 39 to fix the position of the sealing door 21.

[0029] All standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art. The installation methods between equipment are also the same as conventional installation methods in the prior art. For example, the two ends of shaft-shaped parts are connected by bearings, the connection position of valve components is provided with anti-leakage rubber strips, the outside of threaded rods or lead rods is provided with dust covers, and the equipment can be driven by either built-in batteries or external power supply. The control method is automatic control by a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art and is common knowledge in the field. Since this invention is mainly used to protect mechanical devices, this invention will not explain the control method and circuit connection in detail. The external controller mentioned in the specification can play a control role for the electrical components mentioned herein, and the external controller is a conventional known device.

[0030] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A continuous annealing copper wire drawing machine, comprising an annealing machine (1), characterized in that: A first fixing plate (2) is fixedly connected to the bottom of the inner cavity of the annealing machine (1). A second fixing plate (3) is fixedly connected to the bottom of the inner cavity of the annealing machine (1) and to one side of the first fixing plate (2). A first preheating roller (4) is rotatably connected to one side of the first fixing plate (2) via a bearing. A second preheating roller (5) is rotatably connected to one side of the second fixing plate (3) via a bearing. A first rotary joint (6) is installed on one side of the first fixing plate (2). A second rotary joint (7) is installed on one side of the second fixing plate (3). A fixing box (9) is fixedly connected to the back of the annealing machine (1). A third rotary joint (10) is installed on one side of the inner cavity of the fixing box (9). A third rotary joint (10) is installed on one side of the inner cavity of the fixing box (9) and to the right of the third rotary joint (10). The annealing machine (1) is equipped with a fourth rotary joint (11). The two ends of the first preheating roller (4) are respectively connected to one end of the first rotary joint (6) and the third rotary joint (10). The two ends of the second preheating roller (5) are respectively connected to one end of the second rotary joint (7) and the fourth rotary joint (11). The other end of the third rotary joint (10) is equipped with a discharge pipe (16). One end of the discharge pipe (16) extends to the outside of the fixed box (9). The other end of the fourth rotary joint (11) is equipped with an inlet pipe (17). One end of the inlet pipe (17) extends to the outside of the fixed box (9). The inner wall of the annealing machine (1) is rotatably connected to two electrode rollers (18). The first rotary joint (6) and the second rotary joint (7) are connected by a connecting pipe (8).

2. The continuous annealing copper wire drawing machine according to claim 1, characterized in that: The bottom of the annealing machine (1) is fixedly connected to a cooling box (19), and a top cover (23) is placed on the top of the cooling box (19). Electric telescopic rods (22) are fixedly connected to both sides of the cooling box (19). The telescopic ends of the electric telescopic rods (22) are fixedly connected to the bottom of the top cover (23). Through slots (24) are opened at both ends of the top of the cooling box (19) and both ends of the bottom of the top cover (23).

3. The continuous annealing copper wire drawing machine according to claim 2, characterized in that: A sealing door (21) is installed on the left side of the cooling box (19) via a hinge shaft (20). A threaded block (37) is fixedly connected to the right end of the sealing door (21). A screw (38) is threaded inside the threaded block (37). A positioning block (39) is fixedly connected to the right side of the cooling box (19) and below the threaded block (37). The bottom end of the screw (38) extends into the positioning block (39).

4. A continuous annealing copper wire drawing machine according to claim 2, characterized in that: A partition plate (27) is fixedly connected to the bottom of the inner cavity of the cooling box (19), and a guide roller (28) is rotatably connected to the back of the inner cavity of the cooling box (19).

5. A continuous annealing copper wire drawing machine according to claim 1, characterized in that: The top of the annealing machine (1) is fixedly connected to a pump (26), one end of which is fixedly connected to a hose (25). The bottom end of the hose (25) extends to the bottom of the top cover (23) and is fixedly connected to a suction head. The other end of the pump (26) is connected to the other end of the inlet pipe (17).

6. A continuous annealing copper wire drawing machine according to claim 2, characterized in that: A drive box (29) is fixedly connected to the back of the inner cavity of the cooling box (19). A screw (33) is rotatably connected inside the drive box (29), and a push column (34) is mounted on the outside of the screw (33). The push column (34) cooperates with the screw (33). One end of the push column (34) extends to the outside of the drive box (29) and is fixedly connected to a mounting bracket (32). The mounting bracket (32) and one side of the drive box (29) are rotatably connected to a rotating roller (30) through a bearing. A sponge pad (31) is wound around the outside of the rotating roller (30). An adhesive layer (36) is installed on the inside of the sponge pad (31), and the sponge pad (31) is adhered to the outside of the rotating roller (30) through the adhesive layer (36). A third motor (35) is fixedly connected to one side of the cooling box (19), and the output end of the third motor (35) is connected to one end of the screw (33).

7. A continuous annealing copper wire drawing machine according to claim 2, characterized in that: A liquid replenishment pipe (40) is fixedly connected to the right side of the cooling box (19), and one end of the liquid replenishment pipe (40) extends into the interior of the cooling box (19).

8. A continuous annealing copper wire drawing machine according to claim 1, characterized in that: A first motor (12) is fixedly connected to the back of the fixed box (9). A second motor (14) is fixedly connected to the back of the fixed box (9) and to the right of the first motor (12). The output ends of the second motor (14) and the first motor (12) extend into the fixed box (9). The outer sides of the output ends of the first preheating roller (4) and the first motor (12) are fixedly fitted with meshing first gears (13). The outer sides of the output ends of the second preheating roller (5) and the second motor (14) are fixedly fitted with meshing second gears (15).

9. A continuous annealing method, characterized in that: Includes the following steps: Step 1: The room temperature copper wire is first wound around the surface of the actively rotating preheating roller; Step 2: The preheated copper wire enters the annealing zone and passes continuously through the electrode roller. The electrode roller is supplied with a large current, and the copper wire is directly heated by its own resistance, so that it reaches the recrystallization temperature in a very short time and completes the main annealing (softening). Step 3: Immerse the annealed high-temperature copper wire in cooling water for quenching.

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