High-efficiency copper flat wire drawing forming equipment

Abstract

The utility model discloses high-efficiency copper flat wire drawing forming equipment which comprises a rack (6), a first special-shaped wire-drawing die (7), a roller pair (8) and a second special-shaped wire-drawing die (9) are sequentially arranged on the rack (6) seen from the moving direction of a copper flat wire (1), a first wire-drawing hole (10) is formed in the first special-shaped wire-drawing die (7), the aspect ratio of the first wire-drawing hole (10) is smaller than 2, and the width of the second wire-drawing hole (10) is smaller than 2. Narrow grooves (3) are formed in the two sides of the first wire drawing hole (10) in the width direction, the height of the narrow grooves (3) is larger than the thickness of the copper flat wire (1) and does not exceed 0.1 mm, a driving mechanism is connected to the roller pair (8), a gap between the roller pair (8) is matched with the height of the narrow grooves (3), and second wire drawing holes (11) matched with the copper flat wire (1) are formed in the second special-shaped wire drawing die (9). The high-width-to-thickness-ratio copper wire production line has the advantages of being capable of producing high-width-to-thickness-ratio copper wires, low in cost, high in percent of pass and high in production efficiency.

Description

Technical Field

[0001] The utility model belongs to the field of copper flat wires, and particularly relates to a high-efficiency copper flat wire drawing and forming device. Background Art

[0002] Copper flat wire is the main material for making enameled flat wire, and its production processes include special-shaped die drawing method, strip longitudinal shearing method and rolling method.

[0003] The special-shaped die drawing method is obtained by drawing thick wire with a rectangular cross-section using a special-shaped wire drawing die with a rectangular hole shape. It has low cost, but can only produce copper flat wires with a low width-to-thickness ratio. When used for making copper flat wires with a width-to-thickness ratio exceeding 2.5, fractures are likely to occur.

[0004] The strip longitudinal shearing method uses a longitudinal shearing machine set to cut a large-width strip to obtain a narrow strip with a minimum width of about 3 mm. The advantages of the strip longitudinal shearing process are small processing difficulty, and large-width copper flat wires with a large width-to-thickness ratio can be obtained, and the processing cost is low in the case of large width. The disadvantage is that the transverse tension during the cutting feed process is extremely likely to cause sickle bend and wire kinking phenomena, making the product unqualified.

[0005] The rolling method first draws the copper material to an accurate wire diameter by the round wire drawing method, and then forms it by multi-pass flat roll flattening. The rolling method can obtain copper flat wires with a large width-to-thickness ratio, but requires relatively expensive equipment investment and more stringent production processes. It is generally only used in the production of ultra-thin copper flat wires (thickness less than 0.2 mm). When used for conventional copper flat wires (thickness above 0.5 mm), it is not only inappropriate in terms of cost, but also the obtained copper flat wires will have arc surfaces formed by rolling on both sides in the width direction. Figure 6 As shown, when the enameled flat wire made of the copper flat wire is used for winding, the slot filling factor will be reduced and the use effect is not very good.

[0006] Among the above three processes, the special-shaped die drawing method has the lowest cost, the strip longitudinal shearing method is the second lowest, and the rolling method is the highest. The special-shaped die drawing method cannot be used to make copper flat wires with a width-to-thickness ratio exceeding 2.5; the strip longitudinal shearing method cannot be used to make copper flat wires with a width less than 3 mm, and the qualified rate is relatively low; the rolling method is not suitable for the production of conventional copper flat wires. Content of the Utility Model

[0007] The purpose of the utility model is to provide a high-efficiency copper flat wire drawing and forming device. The utility model has the advantages of being able to produce copper wires with a high width-to-thickness ratio, and having low cost, high qualified rate and high production efficiency.

[0008] Technical solution of the utility model: A high-efficiency copper flat wire drawing and forming device, including a frame. When viewed from the moving direction of the copper flat wire, an abnormal wire drawing die, a pair of rollers, and a second abnormal wire drawing die are successively arranged on the frame. An abnormal wire drawing hole is provided on the first abnormal wire drawing die. The aspect ratio of the width to the height of the first wire drawing hole is less than 2. Narrow grooves are provided on both sides of the width direction of the first wire drawing hole. The height of the narrow groove is greater than the thickness of the copper flat wire and does not exceed 0.1 mm. A driving mechanism is connected to the pair of rollers, and the gap of the pair of rollers is matched with the height of the narrow groove. A second wire drawing hole matching the copper flat wire is provided on the second abnormal wire drawing die.

[0009] In the above-mentioned high-efficiency copper flat wire drawing and forming device, both the first abnormal wire drawing die and the second abnormal wire drawing die include a template connected to the frame. An installation hole is provided on the template, and a module is provided at the installation hole. The module is connected to the template by screws, and a first wire drawing hole or a second wire drawing hole is provided on the module.

[0010] In the above-mentioned high-efficiency copper flat wire drawing and forming device, both ends of the first wire drawing hole and both ends of the second wire drawing hole expand outwards to form a flared opening.

[0011] In the above-mentioned high-efficiency copper flat wire drawing and forming device, an oil tank is provided at the bottom of the frame, and an oil pump is provided in the oil tank. Spray oil pipes connected to the oil pump are provided on the front and rear sides of the first wire drawing hole, on the front and rear sides of the pair of rollers, and on the front and rear sides of the second wire drawing hole.

[0012] In the above-mentioned high-efficiency copper flat wire drawing and forming device, valves are provided on all six spray oil pipes.

[0013] In the above-mentioned high-efficiency copper flat wire drawing and forming device, a cavity is formed between the frame, the first abnormal wire drawing die, and the second abnormal wire drawing die. The cavity is connected to a gas source of nitrogen or carbon dioxide through an air pipe, and an air valve is provided on the air pipe.

[0014] In the above-mentioned high-efficiency copper flat wire drawing and forming device, the pair of rollers includes a driving roller and a driven roller located above the driving roller. Both ends of the driving roller are rotatably connected to the frame. A motor is provided on the frame, and the motor is connected to the driving roller through a magnetic coupling. Both ends of the driven roller are provided with sliders connected to the frame, and fasteners are provided between the sliders and the frame.

[0015] In the above-mentioned high-efficiency copper flat wire drawing and forming device, the output rotation speed of the motor is greater than the rotation speed of the driving roller. The maximum transmission torque of the magnetic coupling converts the driving force of the driving roller into the traction force of the second blank wire. The sum of the resistance when the first blank wire passes through the pair of rollers and the resistance when the thick wire passes through the first abnormal wire drawing die is greater than the traction force of the driving roller on the second blank wire.

[0016] Compared with the prior art, the utility model combines the existing special-shaped die drawing method and rolling method, has two special-shaped wire drawing dies and a pair of opposing rollers. First, a thick wire is drawn for the first time using a special-shaped wire drawing die. During the first drawing, the thick wire is drawn into a first-stage blank wire, and the width-thickness ratio of the first-stage blank wire is less than 2, ensuring that the first-stage blank wire has good rigidity and will not be broken. Wings similar in thickness to the copper flat wire to be obtained are formed on both sides of the first-stage blank wire through narrow grooves. Although the wings are relatively thin, due to their narrow width, they will not crack during drawing, ensuring smooth drawing. After the first drawing is completed, the first-stage blank wire is extruded by the opposing rollers. During the extrusion by the opposing rollers, since the wing part is basically not deformed by extrusion, it is ensured that the outer sidewall of the wing will not bend to form an arc surface, improving the service effect of the obtained copper flat wire. At the same time, the extrusion by the opposing rollers exerts a vertical force to deform the first-stage blank wire, which is different from the deformation of the first-stage blank wire caused by tensile force, so that the first-stage blank wire will not break and can be formed into a second-stage blank wire with a high flatness ratio. After the extrusion by the opposing rollers, the second-stage blank wire is drawn for the second time using a second special-shaped wire drawing die. During the second drawing, since the shape of the second-stage blank wire is similar to that of the copper flat wire, the deformation margin is small and the drawing resistance is small, ensuring that the second-stage blank wire is not easily broken. Since there is no lateral tension during drawing and extrusion by the opposing rollers, the obtained copper flat wire will not have sickle bend and wire twisting phenomena, and the product qualification rate is high. Since the utility model is a continuous operation process, the production efficiency is also relatively high. Therefore, the utility model has the advantages of being able to produce copper wires with a high width-thickness ratio, low cost, high qualification rate, and high production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a front view schematic diagram of the utility model.

[0018] Figure 2 is a left view schematic diagram of a first special-shaped wire drawing die.

[0019] Figure 3 is a left view schematic diagram of a second special-shaped wire drawing die.

[0020] Figure 4 is a left view schematic diagram of the opposing rollers.

[0021] Figure 5 is a cross-sectional schematic diagram of a first wire drawing hole.

[0022] Figure 6 is a cross-sectional schematic diagram of a copper flat wire obtained by the existing rolling method.

[0023] The reference numerals in the drawings are: 1 - copper flat wire, 2 - first-stage blank wire, 3 - narrow groove, 4 - second-stage blank wire, 5 - fillet, 6 - frame, 7 - first-stage special-shaped wire drawing die, 8 - pair of rolls, 9 - second-stage special-shaped wire drawing die, 10 - first-stage wire drawing hole, 11 - second-stage wire drawing hole, 12 - template, 13 - mounting hole, 14 - module, 15 - bell mouth, 16 - oil groove, 17 - oil pump, 18 - oil spray pipe, 19 - valve, 20 - cavity, 21 - air pipe, 22 - air valve, 23 - driving roll, 24 - driven roll, 25 - slider, 26 - fastener, 27 - motor, 28 - magnetic coupling, 29 - notch. Detailed implementation mode

[0024] The present invention will be further described below in conjunction with the drawings and embodiments, but it shall not be used as a basis for limiting the present invention.

[0025] Embodiment. A high-efficiency copper flat wire drawing and forming device for producing a copper flat wire 1 with a thickness of 1 mm and a width of 5 mm, comprising a frame 6. Looking from the moving direction of the copper flat wire 1, a first-stage special-shaped wire drawing die 7, a pair of rolls 8 and a second-stage special-shaped wire drawing die 9 are sequentially arranged on the frame 6.

[0026] The first-stage special-shaped wire drawing die 7 is provided with a first-stage wire drawing hole 10. The aspect ratio of the width to the height of the first-stage wire drawing hole 10 is less than 2. The height T1 of the first-stage wire drawing hole 10 is taken as 1.8 mm. Rectangular narrow grooves 3 are arranged on both sides in the width direction of the first-stage wire drawing hole 10. The height T2 of the narrow groove 3 is taken as 1.05 mm, and the width L1 of the narrow groove 3 is taken as 1 mm. The upper and lower bottom surfaces of the narrow groove 3 are inclinedly connected to the upper and lower bottom surfaces of the first-stage wire drawing hole 10, and fillets 5 for transition are arranged at the connection positions. The height of the narrow groove 3 is 1.05 mm.

[0027] A driving mechanism is connected to the pair of rolls 8. The gap of the pair of rolls 8 is matched with the height of the narrow groove 3. The second-stage special-shaped wire drawing die 9 is provided with a second-stage wire drawing hole 11 matched with the copper flat wire 1.

[0028] The thick wire for producing the copper flat wire 1 sequentially passes through the first-stage wire drawing hole 10, the pair of rolls 8, and the second-stage wire drawing hole 11, and then forms a first-stage blank wire 2, a second-stage blank wire 4 and a copper flat wire 1 respectively.

[0029] Both the first-stage special-shaped wire drawing die 7 and the second-stage special-shaped wire drawing die 9 include a template 12 connected to the frame 6. Mounting holes 13 are arranged on the template 12. Modules 14 are arranged at the mounting holes 13. The modules 14 are connected to the template 12 by screws. The first-stage wire drawing hole 10 or the second-stage wire drawing hole 11 is arranged on the module 14.

[0030] Both ends of the first-stage wire drawing hole 10 and both ends of the second-stage wire drawing hole 11 expand outwards to form bell mouths 15.

[0031] The bottom of the frame 6 is provided with an oil sump 16. The first wire drawing hole 10, the pair of rollers 8 and the second wire drawing hole 11 are all located above the oil sump 16. An oil pump 17 is arranged in the oil sump 16. Spray oil pipes 18 connected to the oil pump 17 are arranged on the front and rear sides of the first wire drawing hole 10, the front and rear sides of the pair of rollers 8, and the front and rear sides of the second wire drawing hole 11. The spray oil pipes 18 can be fixed to the frame 6 through connectors.

[0032] Valves 19 are arranged on all six spray oil pipes 18.

[0033] A cavity 20 is formed among the frame 6, the first profiled wire drawing die 7 and the second profiled wire drawing die 9. The cavity 20 is connected to a gas source of nitrogen or carbon dioxide through an air pipe 21. The outlet on the gas source is self-equipped with a pressure reducing valve to achieve low-pressure gas outlet. A gas valve 22 is arranged on the air pipe 21. A notch 29 is arranged at the bottom of the template 12. The liquid level height of the stretching oil in the oil sump 16 exceeds the notch 29, which plays a role in preventing nitrogen or carbon dioxide from flowing out of the cavity 20 and leaves a passing channel for the corresponding spray oil pipes 18 to extend out of the cavity 20.

[0034] The pair of rollers 8 includes a driving roller 23 and a driven roller 24 located above the driving roller 23. Both ends of the driving roller 23 are rotatably connected to the frame 6. A motor 27 is arranged on the frame 6. The motor 27 is connected to the driving roller 23 through a magnetic coupling 28. Sliders 25 connecting to the frame 6 are arranged at both ends of the driven roller 24. Fasteners 26 are arranged between the sliders 25 and the frame 6. Vertical long holes are arranged on the sliders 25. The fasteners 26 are bolts that pass through the long holes and then connect to the frame 6. When the bolts are loosened, the sliders 25 can move up and down to change the height of the driven roller 24 and change the gap of the pair of rollers, which is suitable for the production of copper flat wires with different thicknesses.

[0035] The output rotation speed of the motor 27 is greater than the rotation speed of the driving roller 23. The maximum transmitted torque of the magnetic coupling 28 converts the driving force of the driving roller 23 into the traction force of the second-stage blank wire 4. The sum of the resistance when the first-stage blank wire 2 passes through the pair of rollers 8 and the resistance when the thick wire passes through the first profiled wire drawing die 7 is greater than the traction force of the driving roller 23 on the second-stage blank wire 4. That is to say, it is impossible to make the copper wire pass through the first profiled wire drawing die 7 and the pair of rollers 8 only by relying on the pair of rollers. A small part of the traction force needs to be obtained on the copper flat wire 1. The traction force on the copper flat wire 1 comes from the drawing machine, which ensures that the second-stage blank wire 4 will not accumulate between the pair of rollers and the second profiled wire drawing die 9 and ensures the smooth progress of production. This can be achieved by selecting an appropriate magnetic coupling 28, and the traction force of the pair of rollers 8 is limited through the magnetic coupling 28.

[0036] Usage method: The device is fixed on the drawing machine. The thick wire is wound around the feeding mechanism of the drawing machine. The thick wire passes through a wire drawing hole 10, a pair of rollers 8, and a second wire drawing hole 11, and then becomes a copper flat wire 1 and is connected to the receiving mechanism of the drawing machine. The receiving mechanism winds the copper flat wire 1 and applies a traction force to the copper flat wire 1.

[0037] When the thick wire passes through the first wire drawing hole 10, the cross-section becomes the shape of the first wire drawing hole 10, and a first blank wire 2 is obtained. When passing through the pair of rollers 8, the protruding parts on the upper and lower sides of the first blank wire 2 are flattened, and the flat parts on both sides (corresponding to the narrow groove positions) basically do not deform, and the cross-section becomes a rectangle similar to the copper flat wire 1, with the thickness reduced, and the dimensions are 1.05 mm in thickness and 5.05 mm in width. Finally, it passes through the second wire drawing hole 11 and is trimmed into the copper flat wire 1.

[0038] The oil pump 17 pumps the drawing oil in the oil sump 16, and the drawing oil is sprayed out from the spray oil pipe 18. By adjusting the opening degrees of the respective valves 19, the amounts of oil sprayed out from the respective spray oil pipes 18 are made similar or the same. The spray oil pipes 18 located in front of the first wire drawing hole 10, the pair of rollers 8, and the second wire drawing hole 11 mainly play a lubricating role, reducing the drawing resistance, avoiding the copper wire from breaking, and at the same time reducing the wear of the module 14 and reducing the maintenance frequency. The spray oil pipes 18 located behind the first wire drawing hole 10, the pair of rollers 8, and the second wire drawing hole 11 mainly play a role in cooling the copper wire, avoiding the oxidation of the copper wire and reducing the quality, and at the same time the copper wire maintains low-temperature mechanical properties without decline, and to a certain extent, it can also prevent the copper wire from breaking.

[0039] Nitrogen or carbon dioxide in the gas source is introduced into the cavity 20 through the air pipe, reducing the oxygen content in the cavity 20, further avoiding the oxidation of the copper wire, and improving the quality of the copper flat wire 1. First, drain the drawing oil in the oil sump 16, introduce nitrogen or carbon dioxide in a large flow rate, and then refill the drawing oil into the oil sump 16 so that external air cannot enter the cavity 20. At this time, the air valve 22 maintains a small opening degree, and nitrogen or carbon dioxide can be slowly supplemented into the cavity 20, reducing the gas consumption and lowering the production cost.

[0040] In the device, when producing copper flat wires of different specifications, only the corresponding module needs to be replaced and the passing gap of the pair of rollers needs to be adjusted, and the applicable range is relatively wide. At the same time, spraying the drawing oil not only further reduces the possibility of the copper wire breaking, but also protects the copper wire from oxidation and avoids the reduction of the copper wire quality. The pair of rollers is driven to rotate by the motor through the magnetic coupling, ensuring that the motor speed does not affect the moving speed of the copper wire, and ensuring that the driving force distribution at each position of the copper wire is reasonable, and the copper wire is always moving under a taut state, avoiding the generation of knotting areas, and ensuring the smooth progress of production.

Claims

1. A high-efficiency copper flat wire drawing and forming device, characterized in that: It includes a frame (6). When viewed from the moving direction of the copper flat wire (1), a special-shaped wire drawing die (7), a pair of rollers (8), and a second special-shaped wire drawing die (9) are successively arranged on the frame (6). A first wire drawing hole (10) is provided on the first special-shaped wire drawing die (7). The aspect ratio of the width to the height of the first wire drawing hole (10) is less than 2. Narrow grooves (3) are provided on both sides of the width direction of the first wire drawing hole (10). The height of the narrow groove (3) is greater than the thickness of the copper flat wire (1) and does not exceed 0.1 mm. A driving mechanism is connected to the pair of rollers (8). The gap of the pair of rollers (8) is matched with the height of the narrow groove (3). A second wire drawing hole (11) that matches the copper flat wire (1) is provided on the second special-shaped wire drawing die (9).

2. The high-efficiency copper flat wire drawing and forming equipment according to claim 1, characterized in that: Both the first special-shaped wire drawing die (7) and the second special-shaped wire drawing die (9) include a template (12) connected to the frame (6). An installation hole (13) is provided on the template (12). A module (14) is provided at the installation hole (13). The module (14) is connected to the template (12) by screws. The first wire drawing hole (10) or the second wire drawing hole (11) is provided on the module (14).

3. The high-efficiency copper flat wire drawing and forming equipment according to claim 2, wherein: Both ends of the first wire drawing hole (10) and both ends of the second wire drawing hole (11) expand outwards to form a flared opening (15).

4. The high-efficiency copper flat wire drawing and forming equipment according to claim 1, characterized in that: An oil sump (16) is provided at the bottom of the frame (6). An oil pump (17) is provided in the oil sump (16). Spray oil pipes (18) connected to the oil pump (17) are provided on the front and rear sides of the first wire drawing hole (10), the front and rear sides of the pair of rollers (8), and the front and rear sides of the second wire drawing hole (11).

5. The high-efficiency copper flat wire drawing and forming equipment according to claim 4, characterized in that: Valves (19) are provided on all six spray oil pipes (18).

6. The high-efficiency copper flat wire drawing and forming equipment according to claim 4, characterized in that: A cavity (20) is formed between the frame (6), the first special-shaped wire drawing die (7), and the second special-shaped wire drawing die (9). The cavity (20) is connected to a gas source of nitrogen or carbon dioxide through an air pipe (21). A gas valve (22) is provided on the air pipe (21).

7. The high-efficiency copper flat wire drawing and forming equipment according to claim 1, characterized in that: The pair of rollers (8) includes a driving roller (23) and a driven roller (24) located above the driving roller (23). Both ends of the driving roller (23) are rotatably connected to the frame (6). A motor (27) is provided on the frame (6). The motor (27) is connected to the driving roller (23) through a magnetic coupling (28). Sliders (25) connected to the frame (6) are provided at both ends of the driven roller (24). Fasteners (26) are provided between the sliders (25) and the frame (6).

8. The high-efficiency copper flat wire drawing and forming equipment according to claim 7, characterized in that: The output rotation speed of the motor (27) is greater than the rotation speed of the driving roller (23). The maximum transmission torque of the magnetic coupling (28) converts the driving force of the driving roller (23) into the traction force of the second blank wire (4). The sum of the resistance when the first blank wire (2) passes through the pair of rollers (8) and the resistance when the thick wire passes through the first special-shaped wire drawing die (7) is greater than the traction force of the driving roller (23) on the second blank wire (4).

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