Automobile motor enameled wire butt-joint butt-welding process

Abstract

The invention discloses an automobile motor enamelled wire butt-joint butt-welding process which is used for welding the ends of two enamelled wires together, the enamelled wires are enamelled rectangular wires, and the process comprises the following steps: a, cleaning the welding ends of the enamelled wires; b, overlapping and butting the welding ends of the two enameled wires in the thickness direction to form a welding area; c, respectively arranging an upper electrode and a lower electrode above and below the welding area, wherein the upper electrode and the lower electrode are respectively connected with two terminals of a power supply; and d, acting force enabling the upper electrode and the lower electrode to be close to each other and press the welding area is applied, when the upper electrode and the lower electrode make contact with the welding area at the same time, a conductive loop is formed, the upper electrode and the lower electrode are both powered on to release resistance heat, the temperature of the welding area reaches 600-700 DEG C, and the two softened welding ends are welded together through pressure. The method has the advantages that direct welding between the terminal-free enameled wires can be realized, the welding resistance is low, and the welding bonding strength is high.

Description

Technical Field

[0001] This invention belongs to the field of enameled wire welding technology. Background Technology

[0002] Enamelled wire is widely used in automotive motors. Traditional gasoline-powered vehicles typically use low-power motors with low current and voltage, requiring less stringent welding processes. However, with technological advancements and the emergence of new energy vehicles, which use electric motors as their power source, the enamelled wires in these motors bear significantly higher voltage and current loads. These higher voltages and currents place much stricter demands on the welding process of the enamelled wires. The enamelled wires used in new energy vehicles are divided into round and flat wires. Flat wires, due to their better slot fill factor, allow for higher motor power density and are gradually becoming the mainstream. The enamelled wire welding process referred to in this invention specifically refers to the welding process of flat enamelled wires used in the power motors of new energy vehicles.

[0003] Existing welding processes for enameled wires primarily employ hot-melt welding. This involves transferring resistance heat to copper terminals via electrodes. The end of the enameled wire is then inserted into the copper terminal. Ideally, the heat from the copper terminal vaporizes the enamel coating on the wire end, cleaning it. Pressure then forces the copper terminal and enameled wire together strongly. During welding, the current flows only through the electrodes, bypassing the copper terminal and the enameled wire. The advantages of hot-melt welding include the elimination of the need for pre-cleaning the enamel coating, the ability to tightly bond the copper terminal and enameled wire under pressure, extremely high weld density with virtually no voids, and low resistance, meeting the requirements for high voltage and high current in enameled wires. However, in practical applications, some shortcomings have been identified: this process heavily relies on copper terminals or copper tubes as the welding carrier, making it difficult to directly apply to welding enameled wires without terminals, and it lacks adaptability for welding certain special-structure motor windings. Summary of the Invention

[0004] The purpose of this invention is to provide a butt welding process for enameled wires in automotive motors. This invention has the advantage of enabling direct welding between terminalless enameled wires, and also features low welding resistance and high weld strength.

[0005] The technical solution of this invention: a butt welding process for enameled wires in automotive motors, used to weld the ends of two enameled wires together, wherein the enameled wires are enameled flat wires, and includes the following steps. a. Clean the solder ends of the enameled wire; b. Overlap the welding ends of the two enameled wires in the thickness direction to form a welding area. The length of the overlapping area is more than 1.8 times the width of the enameled wire. c. Set up an upper electrode and a lower electrode above and below the welding area, respectively, and connect the upper electrode and the lower electrode to the two terminals of the power supply. d. Apply a force to bring the upper and lower electrodes close to each other and press them together in the welding area. When the upper and lower electrodes are in contact with the welding area at the same time, a conductive circuit is formed. Both the upper and lower electrodes are energized and release resistance heat, so that the temperature of the welding area reaches 600-700℃. The pressure is used to weld the two softened welding ends together.

[0006] In the aforementioned automotive motor enameled wire butt welding process, in step a, the thick sides of the welding end are cleaned by grinding.

[0007] In the aforementioned butt welding process for enameled wires in automotive motors, the welding process is achieved using welding fixtures. The welding fixture includes a lower template, a lower positioning groove that matches the width of the enameled wire on the top surface of the lower template, a lower groove on the bottom surface of the lower positioning groove, a lower electrode that can be raised and lowered in the lower groove, and an upper pressure drive mechanism connected to the lower electrode located below the lower template. The lower template is equipped with an upper template that can be raised and lowered. The bottom surface of the upper template is equipped with an upper positioning groove that matches the width of the enameled wire. The bottom surface of the upper positioning groove is equipped with an upper groove, and an upper electrode is installed in the upper groove. The upper template is equipped with a downward driving mechanism.

[0008] In the aforementioned butt welding process of enameled wires for automotive motors, the welding fixture includes a frame, and the lower pressure drive mechanism, the upper pressure drive mechanism, and the lower template are all fixed to the frame.

[0009] In the aforementioned automotive motor enameled wire butt welding process, the frame includes two support plates. The upper ends of the two support plates are respectively fixed to the two ends of the lower template. A lower adapter plate located below the lower template is provided between the two support plates. An upwardly extending back plate is provided on the rear side of the lower adapter plate. The back plate is fixed to the lower template. An upwardly extending upper adapter plate is provided on the upper end of the back plate.

[0010] In the aforementioned automotive motor enameled wire butt welding process, the upper pressure drive mechanism includes a lower hydraulic cylinder fixed to the lower adapter plate. The telescopic end of the lower hydraulic cylinder is connected to a lower positioning plate that is slidably connected to the lower groove. The lower electrode is located above the lower positioning plate, and a gap is formed between the lower electrode and the lower groove. The lower electrode is connected to the lower positioning plate through an insulating plate. The downward driving mechanism includes an upper hydraulic cylinder fixed to the upper adapter plate. The telescopic end of the upper hydraulic cylinder is connected to the upper template. The upper template is provided with multiple guide posts that all pass through the upper adapter plate.

[0011] In the aforementioned butt welding process of enameled wire for automotive motors, one end of the lower positioning groove penetrates the side wall of the lower template, and the other end of the lower positioning groove forms the lower positioning surface. Both sides of the lower groove are provided with a lower recessed cavity. Both lower recessed cavities are located along the length of the lower positioning groove. A lower friction wheel is provided in the lower recessed cavity and is rotatably connected to the lower template. The top of one lower friction wheel extends 0.1-0.25mm beyond the top surface of the lower template, and the top of the other lower friction wheel extends 0.1-0.25mm beyond the bottom surface of the lower positioning groove. Two lower drive motors are provided on the rear side of the lower template, and the terminals of the two lower drive motors are respectively connected to two lower friction wheels.

[0012] In the aforementioned butt welding process of enameled wire for automotive motors, the lower template is provided with two lower interfaces, which are respectively connected to two lower recesses and connected to a blower.

[0013] In the aforementioned butt welding process of enameled wire for automotive motors, one end of the upper positioning groove penetrates the side wall of the upper template, and the other end of the upper positioning groove forms the upper positioning surface. Both sides of the upper groove are provided with upper concave cavities. Both upper concave cavities are located along the length of the upper positioning groove. The upper concave cavities are provided with upper friction wheels that are rotatably connected to the upper template. The top of one upper friction wheel extends 0.1-0.25mm beyond the bottom surface of the upper template, and the top of the other upper friction wheel extends 0.1-0.25mm beyond the bottom surface of the upper positioning groove. Two upper drive motors are provided on the rear side of the upper template, and the terminals of the two upper drive motors are respectively connected to two upper friction wheels.

[0014] In the aforementioned automotive motor enameled wire butt welding process, the upper template is provided with two upper interfaces, which are respectively connected to two upper concave cavities, and the upper interfaces are connected to an exhaust fan.

[0015] Compared with the prior art, the present invention is mainly designed to adapt to the terminal-free welding requirements of enameled wires for motor windings with special structures. The enamel on the upper and lower sides of the welding end of the enameled wire is cleaned in advance. Two motors are used to clamp the welding ends of the two enameled wires. When the electrodes collide and come into contact with the welding ends, a conductive circuit is formed. The electrodes generate resistance heat. Using resistance heat and pressure, atomic diffusion occurs between the two welding ends, thereby welding them together.

[0016] Existing hot melt welding processes involve heating the electrodes to soften the copper terminals and vaporize the enamel coating. After the copper terminals soften, they are easily deformed under pressure and bond with the enameled wire, resulting in high welding efficiency. During welding, the current does not pass through the enameled wire. In contrast, the heating in this invention is to facilitate the diffusion of atoms at the welding end of the enameled wire under pressure, achieving diffusion welding. Diffusion welding requires a certain amount of time and has relatively lower welding efficiency, but it does not require copper terminals and is suitable for the production of small batches of special structure motors.

[0017] In existing hot-melt welding processes, the application of electricity is only for heating the electrodes. However, in this invention, the application of electricity not only heats the electrodes but also allows current to flow through the contact surface between the two weld ends, significantly improving the bonding strength of the weld. Comparative experiments show that when the current does not flow through the weld surface, the cold shear strength at the weld joint is no more than 160 MPa, while when the current flows through, it increases to over 180 MPa. This is because under the influence of current, atomic diffusion is more complete, and interfacial impurities are partially removed, forming a more stable metallurgical bonding layer.

[0018] In the structure of the welding fixture, a friction wheel is used to clean the enamel coating of the enameled wire. No heating is applied during cleaning, effectively preventing copper wire oxidation. After cleaning, the wire is immediately placed in a relatively sealed environment with low oxygen content, resulting in a low oxidation rate on the welding surface during heating and welding, ensuring low welding resistance. A fan removes grinding dust, keeping the welding surface clean and ensuring low welding resistance.

[0019] In summary, the present invention has the advantage of enabling direct welding between terminalless enameled wires, and has low welding resistance and high welding strength. Attached Figure Description

[0020] Figure 1 This is a front view structural diagram of the welding fixture.

[0021] Figure 2 This is a three-dimensional schematic diagram of the welding fixture viewed from the front.

[0022] Figure 3 This is a three-dimensional schematic diagram of the welding fixture from the rear view.

[0023] Figure 4 This is a 3D schematic diagram of the template.

[0024] Figure 5 This is a 3D schematic diagram of the template.

[0025] The markings in the attached diagram are as follows: 1-Enameled wire, 2-Upper electrode, 3-Lower electrode, 4-Lower template, 5-Lower positioning groove, 6-Lower recess, 7-Upper template, 8-Upper positioning groove, 9-Upper recess, 10-Support plate, 11-Lower adapter plate, 12-Back plate, 13-Upper adapter plate, 14-Lower cylinder, 15-Lower positioning plate, 16-Insulating plate, 17-Guide post, 18-Lower positioning surface, 19-Lower cavity, 20-Lower friction wheel, 21-Lower drive motor, 22-Lower interface, 23-Upper positioning surface, 24-Upper cavity, 25-Upper friction wheel, 26-Upper drive motor, 27-Upper interface, 29-Reinforcing rib plate, 31-Upper cylinder, 32-Allowing hole. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0027] Example: A welding fixture, such as Figure 1 As shown, the machine includes a frame, which includes two support plates 10 on the left and right. A lower adapter plate 11 is provided between the two support plates 10. The lower adapter plate 11 is screwed to the support plates 10. A back plate 12 extending upward is provided on the rear side of the lower adapter plate 11. The back plate 12 is screwed to the lower template 4. An upper adapter plate 13 extending forward is provided at the upper end of the back plate 12. Reinforcing ribs 29 are provided on both sides of the upper adapter plate 13. The upper adapter plate 13 and the back plate 12 are both screwed to the reinforcing ribs 29.

[0028] A lower template 4 is provided between the two support plates 10. The lower template 4 is located above the lower adapter plate 11. The upper end of the support plate 10 is screwed to the lower side wall of the lower template 4. The top surface of the lower template 4 is provided with a lower positioning groove 5 that matches the width of the enameled wire 1. The right end of the lower positioning groove 5 penetrates the side wall of the lower template 4, the left end of the lower positioning groove 5 forms a lower positioning surface 18, and the right end of the lower positioning groove 5 can be expanded outward to form a guide structure.

[0029] The bottom surface of the lower positioning groove 5 is provided with a lower groove 6, and a lower electrode 3 that can be raised and lowered is provided in the lower groove 6. A gap is formed between the lower electrode 3 and the lower groove 6. An upper pressure drive mechanism connected to the lower electrode 3 is provided below the lower template 4.

[0030] The upper pressure drive mechanism includes a lower hydraulic cylinder 14 fixed to the lower adapter plate 11. The telescopic end of the lower hydraulic cylinder 14 is connected to a lower positioning plate 15 that is slidably connected to the lower groove 6. The lower electrode 3 is located above the lower positioning plate 15, and the lower electrode 3 is connected to the lower positioning plate 15 via an insulating plate 16. The insulating plate 16 is required to have high pressure resistance and high rigidity; materials such as zirconia ceramic and alumina ceramic can be used. When the lower hydraulic cylinder 14 is retracted, the lower electrode 3 should be completely within the lower groove 6. When the lower hydraulic cylinder 14 extends, it pushes the top of the lower electrode 3 out of the lower groove 6. The telescopic stroke of the lower hydraulic cylinder 14 is required to be very small; 1 cm is sufficient.

[0031] Lower recesses 6 have recessed cavities 19 on both the left and right sides. Both recessed cavities 19 are located along the longitudinal direction of the lower positioning groove 5. The top of one recessed cavity 19 penetrates the top surface of the lower template 4, and the top of the other recessed cavity 19 penetrates the bottom surface of the lower positioning groove 5. The lower template 4 has two lower interfaces 22, which connect to the two recessed cavities 19 respectively. The lower interfaces 22 are connected to an exhaust fan via flexible hoses, and a filter is installed at the exhaust end of the exhaust fan.

[0032] The recessed cavity 19 is equipped with lower friction wheels 20 that are rotatably connected to the lower template 4. The top of one lower friction wheel 20 extends 0.1-0.25mm beyond the top surface of the lower template 4, and the top of the other lower friction wheel 20 extends 0.1-0.25mm beyond the bottom surface of the lower positioning groove 5. The extension amounts of the two lower friction wheels 20 are the same, and the magnitude of the extension amount is determined by the thickness of the enameled wire, with an extension amount 0.02-0.05mm greater than the enameled wire thickness being more suitable. Two lower drive motors 21 are provided on the rear side of the lower template 4, and the terminals of the two lower drive motors 21 are respectively connected to the two lower friction wheels 20.

[0033] An upper template 7, which can be raised and lowered, is provided between the lower template 4 and the upper adapter plate 13. The bottom surface of the upper template 7 has an upper positioning groove 8 that matches the width of the enameled wire 1. The left end of the upper positioning groove 8 penetrates the side wall of the upper template 7, and the right end of the upper positioning groove 8 forms an upper positioning surface 23. The left end of the upper positioning groove 8 can expand outward to form a guide structure. An upper groove 9 is provided on the bottom surface of the upper positioning groove 8, and an upper electrode 2 is fixed inside the upper groove 9. The bottom surface of the upper electrode 2 is flush with the bottom surface of the lower groove 6. A downward pressing drive mechanism is provided on the upper template 7. The upper and lower insulating partitions are made of the same material. Both the upper electrode 2 and the lower electrode 3 are molybdenum electrodes.

[0034] The downward driving mechanism includes an upper hydraulic cylinder 31 fixed to the upper adapter plate 13. The telescopic end of the upper hydraulic cylinder 31 is connected to the upper template 7. The upper template 7 is provided with four guide posts 17 that all pass through the upper adapter plate 13. The guide posts 17 guide the lifting and lowering of the upper template 7.

[0035] Upper recesses 24 are provided on both the left and right sides of the upper groove 9. Both upper recesses 24 are located along the longitudinal direction of the upper positioning groove 8. The bottom of one upper recess 24 penetrates the bottom surface of the upper template 7, and the bottom of the other upper recess 24 penetrates the bottom surface of the upper positioning groove 8. The upper template 7 is provided with two upper interfaces 27, which are connected to the two upper recesses 24 respectively. The upper interfaces 27 are connected to the exhaust fan through flexible hoses.

[0036] The upper cavity 24 is equipped with an upper friction wheel 25 rotatably connected to the upper template 7. Two upper friction wheels 25 are located directly below the two lower friction wheels 20. The top of one upper friction wheel 25 extends 0.1-0.25mm beyond the bottom surface of the upper template 7, and the top of the other upper friction wheel 25 extends 0.1-0.25mm beyond the bottom surface of the upper positioning groove 8. The extension amounts of the two upper friction wheels 25 are the same, and the magnitude of the extension is determined by the thickness of the enamel coating on the wire; a difference of 0.02-0.05mm greater than the enamel coating thickness is suitable. The friction material for both the upper friction wheels 25 and the lower friction wheels 20 is a non-conductive resin grinding wheel. The resin grinding wheel can polish the enamel coating while also creating a smoother polishing surface on the exposed copper wire.

[0037] Two upper drive motors 26 are provided on the rear side of the upper template 7, and the terminals of the two upper drive motors 26 are respectively connected to two upper friction wheels 25.

[0038] The back plate 12 is provided with clearance holes 32 for the upper drive motor 26 and the lower drive motor 21.

[0039] The bottom surface of the upper template 7 and / or the top surface of the lower template are insulated to prevent electrical connection when they are bonded together. Preferably, the upper template 7 and the lower template 4 are made of insulating, high-strength, and high-temperature resistant materials, such as alumina ceramic or zirconia ceramic.

[0040] Butt welding process: Connect the upper electrode 2 and the lower electrode 3 to the two terminals of the power supply, which can be the power supply circuit of the butt welding machine.

[0041] like Figure 1 As shown, in the initial state, the upper cylinder 31 is extended, pressing the upper template 7 against the lower template 4, while the lower cylinder 14 is retracted, concealing the lower electrode 3 within the lower groove 6. The upper drive motor 26 drives the upper friction wheel 25 to rotate, and the lower drive motor 21 drives the lower friction wheel 20 to rotate. The left upper friction wheel 25 and the right lower friction wheel 20 rotate counterclockwise, while the right upper friction wheel 25 and the left lower friction wheel 20 rotate clockwise. The exhaust fan creates negative pressure in the lower recess 19 and the upper recess 24.

[0042] Take an enameled wire 1 and insert its welded end into the lower positioning groove 5 until it contacts the lower positioning surface 18. When the welded end passes between the lower friction wheel 20 on the right side and the upper friction wheel 25 on the right side, the paint on the upper and lower sides is polished clean. The dust generated by the paint enters the corresponding lower concave cavity 19 and upper concave cavity 24 under the action of negative pressure, and enters the filter with the airflow of the exhaust fan.

[0043] Take another enameled wire 1 and perform a similar operation, inserting its welding end into the upper positioning groove 8 until it contacts the upper positioning surface 23. The enamel on the upper and lower sides of its welding end is polished clean. The two welding ends overlap to form a welding area, and the length of the overlapping area is twice the width of the enameled wire 1.

[0044] The lower cylinder 14 extends, causing the upper electrode 2, the two welding ends, and the lower electrode 3 to collide and form a conductive circuit. The upper electrode 2 and lower electrode 3 release resistance heat, raising the temperature of the welding zone to 600-700℃. The temperature of the welding zone can be controlled by adjusting the current. Copper has a melting point of 1083℃. After maintaining pressure between the two welding ends for a certain period (approximately 5-10 minutes), interface atoms achieve metallurgical bonding through diffusion. The upward pressure provided by the lower cylinder 14 when it extends should be less than the downward pressure provided by the lower cylinder 14 to maintain static welding in the welding zone. When the lower cylinder 14 extends, a pressure of 20-30 MPa should be generated between the two welding ends to meet the requirements for interface atomic diffusion.

[0045] After welding is completed, the lower hydraulic cylinder 14 retracts back to its original position, the upper hydraulic cylinder 31 retracts, and the upper template 7 is lifted, forming a gap between the upper template 7 and the lower template 4, allowing the welded end of the enameled wire 1 to be removed.

[0046] Further improvements include: setting multiple lower positioning grooves 5 on the lower template 4 and multiple upper positioning grooves 8 on the upper template 7, while simultaneously welding multiple sets of enameled wires to improve welding efficiency.

[0047] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations.

Claims

1. A butt welding process for enameled wires in automotive motors, characterized by: The method for welding the ends of two enameled wires (1) together, wherein the enameled wires (1) are enameled flat wires, includes the following steps: a. Clean the solder end of the enameled wire (1); b. Overlap the welding ends of the two enameled wires (1) in the thickness direction to form a welding area. The length of the overlapping area is more than 1.8 times the width of the enameled wire (1). c. An upper electrode (2) and a lower electrode (3) are respectively set above and below the welding area. The upper electrode (2) and the lower electrode (3) are respectively connected to the two terminals of the power supply. d. Apply a force to bring the upper electrode (2) and the lower electrode (3) closer together and press the welding area together. When the upper electrode (2) and the lower electrode (3) are in contact with the welding area at the same time, a conductive circuit is formed. The upper electrode (2) and the lower electrode (3) are both energized and release resistance heat, so that the temperature of the welding area reaches 600-700℃. The pressure is used to weld the two softened welding ends together.

2. The butt welding process for enameled wires in automotive motors according to claim 1, characterized in that: In step a, the thick sides of the weld end are cleaned by grinding.

3. The butt welding process for enameled wires in automotive motors according to claim 1, characterized in that: The welding process is achieved through welding fixtures. The welding fixture includes a lower template (4), a lower positioning groove (5) that matches the width of the enameled wire (1) is provided on the top surface of the lower template (4), a lower groove (6) is provided on the bottom surface of the lower positioning groove (5), a lower electrode (3) that can be raised and lowered is provided in the lower groove (6), and an upper pressure drive mechanism that connects to the lower electrode (3) is provided below the lower template (4). Above the lower template (4) is an upper template (7) that can be raised and lowered. The bottom surface of the upper template (7) is provided with an upper positioning groove (8) that matches the width of the enameled wire (1). The bottom surface of the upper positioning groove (8) is provided with an upper groove (9). The upper electrode (2) is provided in the upper groove (9). The upper template (7) is provided with a downward driving mechanism.

4. The butt welding process for enameled wires in automotive motors according to claim 3, characterized in that: The welding fixture includes a frame, a lower pressure drive mechanism, an upper pressure drive mechanism, and a lower template (4), all of which are fixed to the frame.

5. The butt welding process for enameled wires in automotive motors according to claim 4, characterized in that: The frame includes two support plates (10), the upper ends of the two support plates (10) are fixed to the two ends of the lower template (4) respectively, and a lower adapter plate (11) is provided between the two support plates (10) and located below the lower template (4). A back plate (12) extending upward is provided on the rear side of the lower adapter plate (11), the back plate (12) is fixed to the lower template (4), and an upper adapter plate (13) extending forward is provided at the upper end of the back plate (12).

6. The butt welding process for enameled wires in automotive motors according to claim 5, characterized in that: The upper pressure drive mechanism includes a lower oil cylinder (14) fixed to the lower adapter plate (11). The telescopic end of the lower oil cylinder (14) is connected to a lower positioning plate (15) that is slidably connected to the lower groove (6). The lower electrode (3) is located above the lower positioning plate (15). A gap is formed between the lower electrode (3) and the lower groove (6). The lower electrode (3) is connected to the lower positioning plate (15) through an insulating plate (16). The downward driving mechanism includes an upper cylinder (31) fixed to the upper adapter plate (13). The telescopic end of the upper cylinder (31) is connected to the upper template (7). The upper template (7) is provided with multiple guide posts (17) that all pass through the upper adapter plate (13).

7. The butt welding process for enameled wires in automotive motors according to claim 3, characterized in that: One end of the lower positioning groove (5) penetrates the side wall of the lower template (4), and the other end of the lower positioning groove (5) forms the lower positioning surface (18). Both sides of the lower groove (6) are provided with lower recesses (19). Both lower recesses (19) are located in the longitudinal direction of the lower positioning groove (5). The lower recesses (19) are provided with lower friction wheels (20) that are rotatably connected to the lower template (4). The top of one of the lower friction wheels (20) extends 0.1-0.25mm beyond the top surface of the lower template (4), and the top of the other lower friction wheel (20) extends 0.1-0.25mm beyond the bottom surface of the lower positioning groove (5). Two lower drive motors (21) are provided on the rear side of the lower template (4), and the terminals of the two lower drive motors (21) are respectively connected to two lower friction wheels (20).

8. The butt welding process for enameled wires in automotive motors according to claim 7, characterized in that: The lower template (4) is provided with two lower interfaces (22), which are respectively connected to two lower recesses (19) and the lower interfaces (22) are connected to the exhaust fan.

9. The butt welding process for enameled wires in automotive motors according to claim 7, characterized in that: One end of the upper positioning groove (8) penetrates the side wall of the upper template (7), and the other end of the upper positioning groove (8) forms the upper positioning surface (23). Both sides of the upper groove (9) are provided with upper concave cavities (24). Both upper concave cavities (24) are located in the longitudinal direction of the upper positioning groove (8). The upper concave cavities (24) are provided with upper friction wheels (25) that are rotatably connected to the upper template (7). The top of one upper friction wheel (25) extends 0.1-0.25mm beyond the bottom surface of the upper template (7), and the top of the other upper friction wheel (25) extends 0.1-0.25mm beyond the bottom surface of the upper positioning groove (8). Two upper drive motors (26) are provided on the rear side of the upper template (7), and the terminals of the two upper drive motors (26) are respectively connected to two upper friction wheels (25).

10. The butt welding process for enameled wires in automotive motors according to claim 9, characterized in that: The upper template (7) is provided with two upper interfaces (27), which are respectively connected to two upper cavities (24) and the upper interfaces (27) are connected to the exhaust fan.

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