Classical close-pressed special-shaped wire stranded conductor single wire drawing die, conductor and processing method

Abstract

The present application relates to a kind of close to compressed special-shaped wire stranded conductor single wire drawing die, conductor and processing method, the die includes die body, die body is cylindrical structure, the middle part of die body is provided with fan-shaped through hole;Fan-shaped through hole includes entry section, compression section and sizing section;The intersection of compression section and sizing section is formed with the included angle of 30 ° to 31.5 ° with horizontal direction.Construction angle of the intersection of compression section and sizing section is formed with the included angle of 30 ° to 31.5 ° with horizontal direction, can be well prevented copper wire in the process of drawing appears broken wire, improves production efficiency, and in the above-mentioned sizing section four end angles close to compression section are set rounded corner, avoid when stranded conductor, appearance smooth does not appear burr, cable insulation will not appear skin effect and occur breakdown, realize the stranded conductor obtained by drawing less consumables, and drawing process is not prone to broken wire, will not affect production efficiency.

Description

Technical Field

[0001] This invention relates to conductor drawing dies, and more specifically to a type of die for drawing single wires of stranded conductors with compressed profiles, a conductor, and a processing method. Background Technology

[0002] A conductor is a material with very low resistivity that readily conducts electric current. Most existing conductors are stranded conductors, such as… Figure 1 as well as Figure 2 As shown, traditional stranded conductors are made of round single wires twisted together. There are gaps between the single wires, between the strands, and in the overall shape of the stranded conductor. The outer diameter is also large. Moreover, when using existing drawing dies to draw traditional stranded conductors, there is a risk of wire breakage during the drawing process, which affects production efficiency. Furthermore, the amount of material consumed in forming stranded conductors is also large.

[0003] Therefore, it is necessary to design a new drawing die to achieve a low material consumption for the stranded conductors obtained by drawing, and to reduce the likelihood of wire breakage during the drawing process, thus not affecting production efficiency. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a single-wire drawing die, conductor, and processing method for a type of compacted irregular-shaped stranded conductor.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a single-wire drawing die for a type of compacted irregular-shaped stranded conductor, comprising a die body, wherein the die body is a cylindrical structure, and a fan-shaped through hole is provided in the middle of the die body; the fan-shaped through hole includes an inlet section, a compression section and a sizing section; the angle formed between the intersection of the compression section and the sizing section and the horizontal direction is 30° to 31.5°.

[0006] The further technical solution is as follows: the lower end face of the sizing section is an arc-shaped surface, and the arc angle of the arc-shaped surface is 10° to 75°.

[0007] The further technical solution is as follows: the two upper corners of the sizing section near the compression section are respectively the first rounded corners, and the two lower corners of the sizing section near the compression section are respectively the second rounded corners.

[0008] The further technical solution is that the radius of the first rounded corner is 1.2mm to 1.8mm.

[0009] The further technical solution is that the radius of the first rounded corner is 1.5mm.

[0010] The further technical solution is that the radius of the second rounded corner is 0.8mm to 1.2mm.

[0011] The further technical solution is that the radius of the second rounded corner is 1mm.

[0012] The further technical solution is as follows: the radius of the lower end face of the sizing section is 3mm to 11mm, and the radius of the upper end face of the sizing section is 1mm to 9mm.

[0013] The present invention also provides a conductor drawn by the above-mentioned compacted irregular-shaped stranded conductor single wire drawing die, comprising a single wire with a circular cross-section and several single wires with irregular cross-sections, wherein the single wire with irregular cross-sections has at least 4 layers, and the several single wires with irregular cross-sections are respectively wrapped around the outer end of the single wire with a circular cross-section.

[0014] The present invention also provides a method for processing the above-mentioned conductor, characterized in that it includes:

[0015] A copper wire with a circular cross-section is first drawn through a die for drawing a single wire of a conductor with a similar compacted irregular shape stranded conductor, and the shape is compressed into a single wire with a fan-shaped cross-section.

[0016] The single wire with a sector-shaped cross-section is drawn a second time through a die for drawing single wires of a type of compacted irregularly shaped stranded conductor.

[0017] The single wire drawn for the second time is drawn for the third time through a die for drawing a stranded conductor with a similar compaction profile, and then pressed into a single wire with an irregular cross-section. The single wire with the irregular cross-section is then assembled with a single wire with a round cross-section to form a conductor.

[0018] The beneficial effects of this invention compared with the prior art are as follows: By setting a fan-shaped through hole in the middle of the mold body, the fan-shaped through hole includes an inlet section, a compression section, and a sizing section. The angle formed by the intersection of the compression section and the sizing section with the horizontal direction is 30° to 31.5°, which can effectively prevent copper wire breakage during the drawing process and improve production efficiency. In addition, the four corners of the sizing section near the compression section are rounded to avoid a smooth surface without burrs when stranding the conductor. The cable insulation will not experience skin effect and breakdown. This results in less material consumption for the stranded conductor obtained by drawing, and the drawing process is less prone to wire breakage, which will not affect production efficiency.

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 The total diameter of the existing technology is 300mm. 2A cross-sectional view of the stranded conductor;

[0022] Figure 2 The total diameter of the existing technology is 400mm. 2 A cross-sectional view of the stranded conductor;

[0023] Figure 3 A schematic diagram of the left-side structure of a single-wire drawing die for a type of compacted irregular-shaped stranded conductor provided in a specific embodiment of the present invention;

[0024] Figure 4 A schematic diagram of the left-side structure of a single-wire drawing die for a type of compacted irregular-shaped stranded conductor provided in a specific embodiment of the present invention;

[0025] Figure 5 The total diameter provided in the specific embodiment of the present invention is 300mm. 2 A cross-sectional view of the conductor;

[0026] Figure 6 The total diameter provided in the specific embodiment of the present invention is 400mm. 2 A cross-sectional view of the conductor;

[0027] Figure 7 A cross-sectional view of a single line with an irregular cross-section provided for a specific embodiment of the present invention;

[0028] Figure 8 A cross-sectional view of a circular copper wire provided for a specific embodiment of the present invention;

[0029] Figure 9 A cross-sectional view of a single wire formed during the first drawing process, provided for a specific embodiment of the present invention;

[0030] Figure 10 A cross-sectional view of a single wire formed by the second drawing process, provided in a specific embodiment of the present invention;

[0031] Figure 11 A cross-sectional view of a single wire formed by the third drawing process, provided for a specific embodiment of the present invention. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 on this invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0039] like Figures 3-11 The specific embodiment shown in this embodiment provides a single-wire drawing die for a type of compressed irregular-shaped stranded conductor. This die can be used in the process of drawing a type of compressed irregular-shaped stranded conductor, resulting in less material consumption for the stranded conductor and less likelihood of wire breakage during the drawing process, thus not affecting production efficiency.

[0040] Please see Figure 3 The aforementioned compacted irregular-shaped stranded conductor single-wire drawing die includes a die body 10, which is a cylindrical structure. A fan-shaped through hole is provided in the middle of the die body 10. The fan-shaped through hole includes an inlet section 20, a compression section 30, and a sizing section 40. The angle formed between the intersection of the compression section 30 and the sizing section 40 and the horizontal direction is 30° to 31.5°.

[0041] Before entering the compression section 30, the copper wire has a circular cross-section. Under tension, it enters the compression section 30 and is compressed into a preliminary irregular shape. During the stretching and compression processes, friction occurs between the copper wire and the mold. Simultaneously, lubricant is sprayed onto the copper wire and the compression zone. As the copper wire moves forward under tension, it carries the lubricant into the compression zone, providing lubrication. The key to achieving these two functions is the compression angle, which is the angle formed by the junction of the compression section 30 and the sizing section 40 with the horizontal direction. If the compression angle is too large, the compression bearing area will be too short, making the wire prone to breakage. If the compression angle is too small, the compression bearing area will be too long, increasing friction between the copper wire and the compression zone, hindering lubrication, causing the mold to overheat, and potentially leading to wire breakage when the copper wire passes through the sizing section 40. In short, both excessively large and small compression angles will result in wire breakage, thus affecting production.

[0042] In this embodiment, the angle between the junction of the compression section 30 and the sizing section 40 and the horizontal direction is 30° to 31.5°, which can effectively prevent the copper wire from breaking during the drawing process and improve production efficiency.

[0043] In one embodiment, please refer to Figure 3 The lower end face of the aforementioned sizing section 40 is an arc-shaped surface, and the arc angle of the arc-shaped surface is 10° to 75°, that is... Figure 4 In the α angle, Figure 4 In this context, angle α1 represents twice the angle formed by the junction of the inlet section 20 and the compression section 30 and the horizontal direction.

[0044] In one embodiment, please refer to Figure 4 The radius of the lower end face of the aforementioned sizing section 40 is 3mm to 11mm, and the radius of the upper end face of the sizing section 40 is 1mm to 9mm.

[0045] The sizing section 40 mainly serves as the shaping area for the irregular cross-section single wire 60. The compression section 30 and the sizing section 40 are connected. After the round copper wire is compressed into a preliminary irregular shape in the compression section 30, it enters the sizing section 40. Under the action of tension, the sizing section 40 presses the copper wire into the required irregular shape.

[0046] When the total diameter of the conductor to be drawn is 300mm 2 ,like Figure 5 When the conductor is shown, depending on the number of layers of the irregular cross-section single wire 60, each layer of the irregular cross-section single wire 60 is made with a separate drawing die. The main differences between the drawing dies of different layers are the angle between the junction of the compression section 30 and the sizing section 40 and the horizontal direction, as well as the diameters of the lower and upper end faces of the sizing section 40.

[0047] Please see Figure 5 For a total diameter of 300mm 2 For the conductor, the core layer is a circular cross-section single wire 50, and the four outer layers are all composed of irregular cross-section single wires 60 drawn using a drawing die. From the core layer away from the core layer, they are sequentially arranged as the first layer of irregular cross-section single wires 60, the second layer of irregular cross-section single wires 60, the third layer of irregular cross-section single wires 60, and the fourth layer of irregular cross-section single wires 60. The sizing section 40 of the drawing die used to draw the first layer of irregular cross-section single wires 60 has a lower end face radius of 72°, an upper end face radius of 1.28 mm, and a lower end face radius of 3.3 mm. The drawing die used to draw the second layer of irregular cross-section single wires 60... The arc angle of the lower end face of the sizing section 40 of the die is 32°, and the radius of the lower end face of the sizing section 40 is 3.3mm and 5.45mm; the arc angle of the lower end face of the sizing section 40 of the drawing die used to draw the third layer of irregular cross-section single wire 60 is 26°, and the radius of the lower end face of the sizing section 40 is 5.45mm and 7.6mm; the arc angle of the lower end face of the sizing section 40 of the drawing die used to draw the fourth layer of irregular cross-section single wire 60 is 20°, and the radius of the lower end face of the sizing section 40 is 7.6mm and 9.8mm.

[0048] Please see Figure 6 For a total diameter of 400mm 2 For the conductor, the conductor distribution is similar to that of a conductor with a total diameter of 300mm. 2 The conductors are similar, and will not be described further here. Specifically, the lower end face of the sizing section 40 of the drawing die used to draw the first layer of irregular cross-section single wire 60 has an arc angle of 60°, and the radius of the upper end face of the sizing section 40 is 1.28 mm, while the radius of the lower end face of the sizing section 40 is 3.8 mm; the lower end face of the sizing section 40 of the drawing die used to draw the second layer of irregular cross-section single wire 60 has an arc angle of 30°, and the radius of the lower end face of the sizing section 40 is 3.8 mm, while the radius of the lower end face of the sizing section 40 is 6.1 mm. mm; the arc angle of the lower end face of the sizing section 40 of the drawing die used to draw the third layer of irregular cross-section single wire 60 is 23°, and the radius of the lower end face of the sizing section 40 is 6.1 mm, and the radius of the lower end face of the sizing section 40 is 8.7 mm; the arc angle of the lower end face of the sizing section 40 of the drawing die used to draw the fourth layer of irregular cross-section single wire 60 is 15°, and the radius of the lower end face of the sizing section 40 is 8.7 mm, and the radius of the lower end face of the sizing section 40 is 11 mm.

[0049] In one embodiment, the two upper corners of the sizing section 40 near the compression section 30 are respectively the first rounded corners 41, and the two lower corners of the sizing section 40 near the compression section 30 are respectively the second rounded corners 42. The first rounded corners 41 and the second rounded corners 42 are provided to ensure that the irregularly shaped cross-section single wire 60 receives sufficient lubrication during the drawing process, resulting in a smooth surface without burrs during conductor stranding, and preventing skin effect and breakdown of the cable insulation.

[0050] In this embodiment, the radius of the first fillet 41 is 1.2 mm to 1.8 mm.

[0051] Preferably, the radius of the first fillet 41 is 1.5 mm.

[0052] In this embodiment, the radius of the second fillet 42 is 0.8 mm to 1.2 mm.

[0053] Preferably, the radius of the second fillet 42 is 1 mm.

[0054] The aforementioned compacted irregular-shaped stranded conductor single-wire drawing die, by setting a fan-shaped through hole in the middle of the die body 10, the fan-shaped through hole includes an inlet section 20, a compression section 30, and a sizing section 40, and the angle formed by the intersection of the compression section 30 and the sizing section 40 with the horizontal direction is 30° to 31.5°, can effectively prevent copper wire breakage during the drawing process, improve production efficiency, and set rounded corners at the four end corners of the sizing section 40 near the compression section 30 to avoid a smooth appearance without burrs when stranding the conductor, and prevent skin effect and breakdown of the cable insulation. This results in less material consumption for the stranded conductor obtained by drawing, and the drawing process is less prone to wire breakage, without affecting production efficiency.

[0055] Please see Figures 5 to 7 The invention also provides a conductor drawn by the aforementioned compacted irregular-shaped stranded conductor single wire drawing die, comprising a single wire with a circular cross-section 50 and several single wires with irregular cross-sections 60, wherein the single wires with irregular cross-sections 60 are provided with at least 4 layers, and the several single wires with irregular cross-sections 60 are respectively wrapped around the outer end of the single wire with a circular cross-section 50.

[0056] To ensure tight stranding of the compacted conductors, the cross-sectional shape of the 60mm² single wire is crucial. (See also...) Figure 7 The radius of the lower end face of the aforementioned irregular cross-section single-line 60 is 3mm to 11mm, and the radius of the upper end face is 1mm to 9mm. The lower end face of the irregular cross-section single-line 60 is an arc-shaped surface with an arc angle of 10° to 75°. Figure 7 Specifically, the cross-section of the irregular cross-section single wire is consistent with the cross-section of the sizing section 40. When the irregular cross-section single wire forms conductors with different total diameters, the corresponding parameters can be consistent with the sizing section 40 of the drawing die used.

[0057] In one embodiment, please refer to Figure 7 The two upper corners of the cross-section of the aforementioned irregular cross-section single wire 60 are the third rounded corners 61, and the two lower corners of the cross-section of the irregular cross-section single wire 60 are the fourth rounded corners 62. The purpose of setting the third rounded corners 61 and the fourth rounded corners 62 is to ensure that the conductor is smooth and free of burrs during stranding, and to prevent the cable insulation from experiencing skin effect and breakdown.

[0058] In this embodiment, the radius of the third fillet 61 is 1.2 mm to 1.8 mm.

[0059] Preferably, the radius of the third fillet 61 is 1.5 mm.

[0060] In this embodiment, the radius of the fourth fillet 62 is 0.8 mm to 1.2 mm.

[0061] Preferably, the radius of the fourth fillet 62 is 1 mm.

[0062] A type of non-compacted conductor, similar in structure and shape to a compacted conductor, is characterized by its individual conductors being non-circular (non-circular) stranded irregularly shaped wires. Figure 5 and Figure 6 As shown, the cable exhibits a compact structure without compression, seamless connections between individual wires and layers, a smooth and gapless shape, and a small conductor outer diameter. It utilizes conductors with irregular cross-sections, ensuring seamless connections between strands and individual wires, resulting in a very compact structure and a smooth, round shape. After insulation, the cable is less prone to skin effect damage. The outer diameter of the irregularly shaped cross-section stranded conductor is 13-14% smaller than that of the circular stranded conductor, saving 11-13% of insulation material, thus reducing both economic benefits and environmental impact. Under the condition of meeting national standard conductor resistance requirements, such as 300mm²... 2 The conductor resistance is ≤0.0601Ω / km at 20℃ and 400mm². 2 When the conductor resistance is ≤0.0470Ω / km at 20℃, 1-2% of copper material can be saved.

[0063] Conductors produced by using a single-wire drawing die for stranded irregularly shaped conductors require less material.

[0064] It should be noted that those skilled in the art can clearly understand that the specific implementation process of the above-mentioned conductor can be referred to the corresponding description in the aforementioned embodiment of the single-wire drawing die for the compacted irregular-shaped stranded conductor. For the sake of convenience and brevity, it will not be repeated here.

[0065] In one embodiment, please refer to Figures 8 to 11 A method for processing the aforementioned conductor is also provided, comprising:

[0066] A copper wire with a circular cross-section is first drawn through a die for drawing a single wire of a conductor with a similar compacted irregular shape stranded conductor, and the shape is compressed into a single wire with a fan-shaped cross-section.

[0067] The single wire with a sector-shaped cross-section is drawn a second time through a die for drawing single wires of a type of compacted irregularly shaped stranded conductor.

[0068] The single wire drawn for the second time is drawn for the third time through a die for drawing a single wire stranded conductor with a similar compaction profile, and is pressed into a single wire with a profile cross-section 60. The single wire with a profile cross-section 60 is then assembled with a single wire with a round cross-section 50 to form a conductor.

[0069] in, Figures 8 to 11 This demonstrates the process of forming a single wire with an irregular cross-section (60°) by drawing a circular cross-section copper wire through a die for drawing a single wire stranded conductor with a similar compaction profile.

[0070] It should be noted that those skilled in the art can clearly understand that the specific implementation process of the above processing method can be referred to the aforementioned embodiment of the single-wire drawing die for the twisted conductor of the compacted irregular wire and the corresponding description in the conductor embodiment. For the sake of convenience and brevity, it will not be repeated here.

[0071] The above examples are merely illustrative of the technical content of the present invention to facilitate easier understanding by the reader, but do not imply that the implementation of the present invention is limited to these examples. Any technical extensions or re-creations made based on the present invention are protected by the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. A single wire drawing die for a class compact profiled strand conductor, characterized in that, The mold body is a cylindrical structure, and a fan-shaped through hole is formed in the middle of the mold body; the fan-shaped through hole comprises an inlet section, a compression section, and a sizing section; the copper wire is circular in cross section before entering the compression section, and is compressed into a preliminary profile under the action of tension; the copper wire and the mold are rubbed during the stretching and compression process, and the copper wire and the compression zone are sprayed with lubricating liquid during the stretching, so that the lubricating liquid is brought into the compression zone to play a lubricating role; the intersection between the compression section and the sizing section forms an angle of 30° to 31.5° with the horizontal direction; The lower end surface of the sizing section is an arc surface, and the radian angle of the arc surface is 10° to 75°; The two upper end corners of the sizing section close to the compression section are respectively first rounded corners, and the two lower end corners of the sizing section close to the compression section are respectively second rounded corners; The radius of the first rounded corner is 1.2 mm to 1.8 mm; The radius of the second rounded corner is 0.8 mm to 1.2 mm.

2. The quasi-closed profile wire stranded conductor unit drawing die according to claim 1, characterized in that, The radius of the first rounded corner is 1.5 mm.

3. The quasi-closed profile wire stranded conductor unit drawing die according to claim 1, characterized in that, The radius of the second rounded corner is 1 mm.

4. The quasi-closed profile wire stranded conductor unit drawing die of claim 1, wherein, The radius of the lower end surface of the sizing section is 3 mm to 11 mm, and the radius of the upper end surface of the sizing section is 1 mm to 9 mm.

5. A conductor drawn from the compact-like profiled wire stranded conductor single wire drawing die according to any one of claims 1 to 4, characterized in that, The copper wire is a single wire with a circular cross section, and a plurality of single wires with a special-shaped cross section are arranged around the outer end of the single wire with a circular cross section.

6. A method for processing the conductor of claim 5, characterized in that, The method comprises the following steps: The copper wire with a circular cross section is drawn through a first drawing die to compress the shape into a single wire with a fan-shaped cross section; The single wire with a fan-shaped cross section is drawn through a second drawing die to compress the shape into a single wire with a special-shaped cross section; The single wire drawn through the second drawing die is drawn through a third drawing die to compress the shape into a single wire with a special-shaped cross section, and the single wire with a special-shaped cross section is assembled with a single wire with a circular cross section to form a conductor.

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