A method for manufacturing aluminum alloy wire and aluminum stranded wire

Abstract

This application discloses a method for manufacturing aluminum alloy wire and aluminum stranded wire, relating to the field of aluminum alloy stranded wire manufacturing technology. The method involves selecting aluminum ingots, magnesium ingots, Al-20Si alloy, Al-20Cr alloy, Al-10V alloy, and lanthanum-cerium mixed rare earth elements as raw materials and smelting them to form an aluminum alloy melt; refining the aluminum alloy melt with inert gas and / or refining agents through in-furnace impurity removal; introducing the aluminum alloy melt into a flow channel integrated with an electromagnetic purification device for external online impurity removal; casting the aluminum alloy melt into an ingot plate, and repeatedly rolling the ingot plate a predetermined number of times using a cumulative rolling method to form an aluminum alloy rod, which is then continuously quenched; allowing the aluminum alloy rod to stand for a predetermined time before drawing it into an aluminum alloy wire, which is then aged to obtain the aluminum alloy wire. Through the above manufacturing method, aluminum alloy wire that meets single-wire tensile strength requirements and has higher conductivity can be prepared with fewer material components.

Description

Technical Field

[0001] This application relates to the field of aluminum alloy stranded wire manufacturing technology, and in particular to a method for manufacturing aluminum alloy wire and aluminum stranded wire. Background Technology

[0002] Overhead conductors have played a vital role in my country's power grid construction. However, with continuous economic development and a surge in electricity load, the scale of power grid construction has expanded significantly, leading to a continuous increase in both the number of lines and transmission capacity. This has resulted in increased line losses. Currently, the State Grid Corporation of China widely uses energy-saving conductors on transmission lines of various voltage levels. In ultra-high voltage AC projects, aluminum alloy stranded wires are widely used, and in extra-high voltage lines, high-conductivity steel-cored aluminum stranded wires are widely adopted. These efforts have yielded significant social and economic benefits in reducing transmission line losses and carbon dioxide emissions.

[0003] To further improve the energy-saving performance of conductors, existing technologies propose a high-conductivity aluminum alloy stranded wire scheme by combining high-conductivity aluminum alloy with high-conductivity hard aluminum. This results in a conductivity of 52.5% IACS and a high tensile strength of 315MPa-325MPa for a single wire. However, the conductivity and strength of aluminum alloys are contradictory; generally, increasing the conductivity of aluminum alloys leads to a decrease in strength. According to fundamental materials science theories, metal strengthening mainly includes solid solution strengthening, second-phase precipitation strengthening, work hardening, and grain refinement strengthening. Among these, grain refinement is crucial: the finer the grains, the more grain boundaries there are, resulting in a greater number of dislocation pile-ups at grain boundaries during deformation, thus hindering dislocation movement and increasing strength. For example, Chinese patent CN108754248B discloses an aluminum alloy conductor for overhead stranded wires and its manufacturing method. The aluminum alloy conductor contains a refining agent, Al-5Ti-0.5B. However, TiB2 particles easily aggregate and precipitate during the aluminum alloy melting and casting process, causing surface scratches during subsequent rolling. Furthermore, the Ti in the refining agent readily undergoes substitution reactions with elements such as Cr in the aluminum alloy, leading to a weakened refining effect, i.e., a "poisoning effect." The refining ability of Al-5Ti-0.5B decreases over time, resulting in poor anti-aging properties. Therefore, an improved solution is urgently needed to address these problems. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a method for manufacturing aluminum alloy wire and aluminum stranded wire, which can solve the technical problems existing in the background art, and obtain aluminum alloy wire with a single wire tensile strength of 315MPa-325MPa and a conductivity of 54% IACS.

[0005] To achieve the above-mentioned technical objectives, this application provides a method for manufacturing an aluminum alloy wire, wherein the aluminum alloy wire is composed of the following components by mass percentage: Mg 0.65-0.7%, Si 0.65-0.7%, La 0.10-0.14%, Ce 0.04-0.06%, Cr 0.02-0.04%, V 0.01-0.02%, Fe≤0.15%, with the balance being Al and other unavoidable impurities;

[0006] The manufacturing method of this aluminum alloy wire includes the following steps:

[0007] The raw materials used are A199.80 grade aluminum ingots for remelting, Mg9990 grade primary magnesium ingots, Al-20Si alloy, Al-20Cr alloy, Al-10V alloy, and lanthanum-cerium mixed rare earth.

[0008] Aluminum ingots are heated and melted, and then magnesium ingots, Al-20Si alloy, Al-20Cr alloy, Al-10V alloy and lanthanum-cerium mixed rare earth are uniformly added to form an aluminum alloy melt, wherein the melting temperature is above 900℃.

[0009] The aluminum alloy melt is sprayed with inert gas and / or refining agent to remove impurities in the furnace.

[0010] The molten aluminum alloy is introduced into a flow channel equipped with an electromagnetic purification device for online impurity removal outside the furnace.

[0011] The molten aluminum alloy is cast into an ingot, and the ingot is repeatedly rolled a predetermined number of times using a cumulative rolling method to make an aluminum alloy rod, which is then continuously quenched.

[0012] The aluminum alloy rod is left to stand for a preset time before being drawn into an aluminum alloy wire.

[0013] Aluminum alloy wire is obtained by aging aluminum alloy wire at 155℃~165℃ for 7h~8h.

[0014] Furthermore, the mass ratio of Mg to Si in the aluminum alloy wire is 0.88 to 1.0.

[0015] Furthermore, the inert gas is nitrogen or argon;

[0016] The refining agent includes sodium chloride powder or potassium chloride powder.

[0017] Furthermore, the inert gas also contains 5% to 25% chlorine.

[0018] Furthermore, the method of repeatedly rolling the ingot plate a preset number of times using cumulative rolling specifically refers to:

[0019] The ingot is cut in half and stacked together, then rolled to half the thickness before rolling. The rolled ingot is then rolled again for a preset number of times.

[0020] Furthermore, the specific steps of casting molten aluminum alloy into ingots are as follows:

[0021] The aluminum alloy molten liquid is cast into ingots using a horizontal casting method, with a casting temperature of 700℃~720℃.

[0022] Furthermore, the process involves casting molten aluminum alloy into an ingot, repeatedly rolling the ingot a predetermined number of times using a cumulative rolling method, and then fabricating an aluminum alloy rod which undergoes continuous quenching.

[0023] The temperature of the ingot entering the rolling mill is controlled at 690℃, and the temperature when it is finally rolled into an aluminum alloy rod is controlled at above 240℃.

[0024] This application also discloses aluminum stranded wire, including the stranded wire body;

[0025] The stranded wire body is made by concentrically stranding aluminum wire and aluminum alloy wire manufactured using the above-described aluminum alloy wire manufacturing method.

[0026] As can be seen from the above technical solutions, the aluminum alloy wire manufacturing method designed in this application optimizes the mass percentage composition of the aluminum alloy wire, removes Ti and B elements added in existing manufacturing processes, and mainly controls the contents of lanthanum (La) and cerium (Ce) to be 0.10-0.14% and 0.04-0.06%, respectively. Under this content control, the measured grain refinement effect of the aluminum alloy wire is obvious, and the strength and microhardness are improved. Furthermore, the manufacturing process is optimized, not only to achieve online impurity removal through electromagnetic purification to achieve better impurity removal effect; but also to use cumulative rolling to repeatedly roll the ingot plate cast from the molten aluminum alloy a preset number of times to obtain an ultrafine grain structure; and the aging temperature and time are also optimized. The above manufacturing method can produce aluminum alloy wires with a single-wire tensile strength of 315MPa to 325MPa and a conductivity of 54% IACS with less material. Compared with traditional aluminum alloy wires, the aluminum alloy wires manufactured by the method designed in this application have higher conductivity, lower DC resistance, and no hysteresis loss in AC environment, which is more advantageous. Therefore, it has a significant advantage in annual loss cost per unit length.

[0027] As can be seen from the above technical solutions, the aluminum stranded wire designed in this application includes a stranded wire body, which is made by concentrically stranding aluminum alloy wire and aluminum wire prepared by the above method. Compared with traditional aluminum stranded wire, under the same cross-section, the aluminum stranded wire designed in this application has higher electrical conductivity, lower DC resistance, and no hysteresis loss in AC environment, which is more advantageous. Therefore, it has a significant advantage in annual loss cost per unit length. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a flowchart of a method for manufacturing an aluminum alloy wire provided in this application;

[0030] Figure 2 This is a schematic diagram of the structure of an aluminum stranded wire provided in this application;

[0031] In the diagram: 100, aluminum alloy wire; 200, aluminum wire. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the embodiments of this application.

[0033] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," 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 the embodiments of this application 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 the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a replaceable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0035] This application discloses a method for manufacturing aluminum alloy wire and aluminum stranded wire.

[0036] Please see Figure 1 The present application provides a method for manufacturing an aluminum alloy wire:

[0037] The aluminum alloy wire is composed of the following components by mass percentage: Mg 0.65-0.7%, Si 0.65-0.7%, La 0.10-0.14%, Ce 0.04-0.06%, Cr 0.02-0.04%, V 0.01-0.02%, Fe≤0.15%, with the balance being Al and other unavoidable impurities. By removing Ti and B elements added in existing manufacturing processes and primarily controlling the content of lanthanum (La) and cerium (Ce) to 0.10-0.14% and 0.04-0.06% respectively, the aluminum alloy wire exhibits significant grain refinement, resulting in improved strength and microhardness.

[0038] The manufacturing method of this aluminum alloy wire includes the following steps:

[0039] S1 uses Al99.80 grade remelted aluminum ingots, Mg9990 grade primary magnesium ingots, Al-20Si alloy, Al-20Cr alloy, Al-10V alloy, and lanthanum-cerium mixed rare earth as raw materials.

[0040] S2 involves heating and melting aluminum ingots, then uniformly adding magnesium ingots, Al-20Si alloy, Al-20Cr alloy, Al-10V alloy, and lanthanum-cerium mixed rare earth elements to form an aluminum alloy melt, with a melting temperature above 900℃.

[0041] S3 involves simultaneously spraying and refining the molten aluminum alloy with inert gas and / or refining agent to remove impurities in the furnace.

[0042] S4. The molten aluminum alloy is introduced into a flow channel integrated with an electromagnetic purification device for online impurity removal outside the furnace.

[0043] S5 involves casting molten aluminum alloy into an ingot, then repeatedly rolling the ingot a predetermined number of times using a cumulative rolling method to produce an aluminum alloy rod, which is then continuously quenched.

[0044] S6, the aluminum alloy rod is left to stand for a preset time before being drawn to form an aluminum alloy wire;

[0045] S7, aluminum alloy wire is obtained by aging aluminum alloy wire at 155℃~165℃ for 7h~8h.

[0046] Regarding step S1, it should be noted that the content of Mg and Si elements and the Mg / Si mass percentage in the aluminum alloy wire will affect the alloy strength and conductivity. The strengthening mechanism of high-performance aluminum alloy is solid solution + precipitation of Mg2Si second phase. If the strength is further improved, the amount of Mg and Si added needs to be increased. Therefore, the alloy has the best comprehensive performance when the content of these two elements is controlled to reach 0.65% to 0.7% by mass and the Mg / Si mass percentage is 0.88 to 1.0.

[0047] Regarding step S2, it should be noted that it can be carried out in an aluminum melting furnace, and the melting rate is preferably greater than 5 tons / hour.

[0048] Regarding steps S3 and S4, during the aluminum alloy smelting process, the gases and inclusions present in the molten aluminum alloy often cause casting defects such as porosity, shrinkage cavities, and hard spots in the castings (subsequent ingots). These defects severely affect the mechanical properties, corrosion resistance, and machinability of the castings. The presence of porosity and shrinkage cavities can also lead to leakage in the castings; therefore, for castings with high airtightness requirements, it is crucial to avoid these defects. The main gas dissolved in the molten aluminum alloy is hydrogen (accounting for over 85%), followed by nitrogen, oxygen, carbon monoxide, etc. The solubility of hydrogen in the molten aluminum alloy is very low in solid aluminum but very high in liquid aluminum, with a solubility difference of approximately 19.1 times between the two phases. Due to this difference in solubility, hydrogen tends to spontaneously precipitate from the melt in the form of hydrogen bubbles. When the pressure of the hydrogen in the precipitated hydrogen bubbles exceeds the surface tension of the molten aluminum alloy and the hydrostatic pressure of the molten aluminum alloy above the bubbles, hydrogen bubbles that can stably exist in the molten aluminum alloy are formed. If the hydrogen bubbles formed do not escape from the surface of the molten aluminum alloy before the casting completely solidifies, pinholes will be created in the casting. Therefore, the purification treatment of molten aluminum alloy mainly involves reducing the hydrogen content in the molten aluminum alloy. It is generally required that the hydrogen content in 100g of molten aluminum alloy should not exceed 0.1mL to 0.2mL.

[0049] The main inclusions in molten aluminum alloys include oxides, nitrides, chlorides, and silicates. Improper handling during the smelting process, such as charging, stirring, and slag removal, can cause tiny inclusions to remain suspended in the molten aluminum alloy. Inclusions with high interfacial energy separate from the molten aluminum alloy and are removed during purification and slag removal; while those with low interfacial energy dissolve in the molten aluminum alloy and remain inside the casting, becoming fatigue crack initiation points or even fracture initiation points, severely affecting the material's service life. Inclusions containing a large amount of Al2O3 have an adsorption force field around them that is opposite to the direction of diffusion dehydrogenation, thus reducing the rate of diffusion dehydrogenation. When the Al2O3 inclusion content is sufficient, the various adsorption force fields converge, further reducing the rate of diffusion dehydrogenation and making dehydrogenation difficult. Simultaneously, the presence of inclusions reduces the fluidity of the melt, making feeding of the casting difficult and easily leading to shrinkage cavities and porosity, affecting product quality.

[0050] It is difficult for a single refining process to simultaneously achieve efficient degassing and inclusion removal. Vacuum purification has good degassing effects, but its inclusion removal effect is not ideal; filtration is very effective at removing inclusions, but its degassing effect is poor. To achieve both good degassing and inclusion removal effects, this application adopts a purification technology that combines in-furnace treatment and online external treatment.

[0051] Specifically, step S3 can involve purifying the molten aluminum alloy in a melting furnace or holding furnace by introducing inert gas and / or refining agent powder into the furnace for impurity removal. The refining agent powder added here mainly includes sodium chloride and potassium chloride, which reduces inclusions in the molten aluminum alloy through physicochemical action. The inert gas is mainly nitrogen or argon, which reduces inclusions in the molten aluminum alloy through adsorption. To further remove alkali metals from the molten aluminum alloy, a certain proportion of chlorine (generally 5%–25%) or refining agent can be mixed into the inert gas, thus simultaneously utilizing adsorption and physicochemical action to comprehensively purify the molten aluminum alloy.

[0052] In step S4, the molten aluminum alloy can be processed between the aluminum melting furnace or holding furnace and the casting equipment. This application employs electromagnetic purification, where the molten aluminum electromagnetic purification equipment consists of a dedicated IGBT induction power supply, a purification system, and a control system. The purification system uses a unique honeycomb-shaped, large-aperture square-hole ceramic separator, integrated with the electromagnetic induction sensor within a universal flow channel. Through optimization and control of process parameters, it ensures the flow of a large volume of molten aluminum alloy while effectively capturing fine inclusions and preventing separator blockage, while also guaranteeing the safe and reliable long-term operation of the purification system. The molten aluminum electromagnetic purification equipment offers energy-saving and environmental advantages; high-efficiency electromagnetic induction heating can increase the temperature of the molten aluminum flowing through the separator by 5°C-8°C. While efficiently purifying the molten aluminum alloy, the entire system can also control the temperature of the molten aluminum alloy at the outlet within a certain range through temperature detection and feedback, ensuring the stability of subsequent casting processes. Compared to conventional ceramic filters, the filtration efficiency for particles larger than 15μm has increased from 66% to 95%; and the removal efficiency for inclusions in the μm 5–15μm range has increased from 46% to 85%.

[0053] Regarding step S5, the casting process can be specifically controlled by the automatic metal casting control system, which automatically controls the flow rate of the holding furnace and ladle. A horizontal casting method can be used to avoid turbulence in the molten aluminum alloy, allowing it to flow smoothly towards the crystallizing wheel. This ensures that during continuous casting, the molten aluminum alloy enters the crystallizing wheel smoothly, evenly, and continuously, guaranteeing the quality of the cast ingot and ensuring the smooth progress of casting production. The casting temperature is preferably controlled at 700-720℃. The crystallizing wheel material is mainly made of pure copper with trace amounts of silver, zirconium, and other elements, and its surface is smooth, without pits or cracks.

[0054] The process of casting molten aluminum alloy into ingots and repeatedly rolling them a predetermined number of times using a cumulative rolling method involves: cutting the ingots in half and stacking them together; rolling them to half their original thickness; cutting the rolled ingots in half again and stacking them together; and repeating this rolling process until the thickness is half again. This process is repeated a predetermined number of times to accumulate ultra-high strain and obtain an ultra-fine grain structure. In step S5, the entry temperature of the rolling process is strictly controlled at 690℃. Rolling at too low a temperature will not yield a good metallurgical structure in a solid solution state, and the mechanical properties of the product will not be guaranteed. The final rolling temperature should not be lower than 240℃ to meet the requirements for quenching treatment. After continuous quenching and cooling, the temperature of the rolled aluminum alloy rod should be less than 100℃ to achieve the quenching effect and ensure a uniform and stable microstructure.

[0055] Regarding steps S6 and S7, it should be noted that aging is a process of uniformly dispersing and precipitating the strengthening phase dissolved in the matrix. Since the element content of high-performance aluminum alloys exceeds that of conventional aluminum alloys, the amount of solute atoms dissolved and the number of rolling defects increase, making the wire prone to breakage during drawing. Therefore, the placement time of the aluminum alloy rod can be extended to a preset time, allowing some solute atoms to fill vacancy defects and reducing rolling stress, thus facilitating drawing and the full precipitation of the strengthening phase during artificial aging. This application preferably uses a high-speed, high-power sliding wire drawing machine to draw the aluminum alloy rod into an aluminum alloy wire with a diameter of 3.4 mm. After drawing, artificial aging treatment is performed at 155℃~165℃ (preferably 160℃) for 7h~8h, increasing the strength of the aluminum alloy wire, reducing its resistivity, and improving its uniformity, ultimately obtaining an aluminum alloy wire with optimal overall performance.

[0056] For aging treatment, a continuous aging furnace is used, which employs segmented temperature control via hot air circulation, resulting in high temperature precision. Robotic arms handle loading and unloading, automatically connecting the high-speed aluminum alloy wire drawing machine to the aging furnace via an automated track. The heat generated during wire drawing is utilized in the aging process, saving energy and reducing costs. Continuous aging is an atomic diffusion process where supersaturated solid solutions continuously decompose and precipitate. The precipitated Mg2Si phase is uniformly distributed, stable, and fine, giving the aluminum alloy wire excellent mechanical and electrical properties. Therefore, the aging temperature and holding time must be precisely controlled; excessively long or short aging times are detrimental to obtaining the wire's superior properties. After aging treatment, the strength of the aluminum alloy wire increases, its resistivity decreases, and the properties of individual wires should become more consistent, achieving optimal quality.

[0057] The aforementioned manufacturing method enables the production of aluminum alloy wires with a single-wire tensile strength of 315MPa–325MPa and a conductivity increased to 54% IACS using fewer materials. Compared to traditional aluminum alloy wires, the aluminum alloy wire manufactured using the method described in this application exhibits higher conductivity, lower DC resistance, and superior performance in AC environments due to the absence of hysteresis losses. Therefore, it offers a significant advantage in annual cost per unit length. For every 1% increase in conductivity (IACS, International Annealed Copper Standard) in aluminum alloy wire, stranded conductor losses can be reduced by more than 3%. Therefore, using the aluminum alloy wire manufactured using this method can reduce high-capacity power transmission losses, meet engineering requirements, and achieve energy conservation, cost reduction, and environmental protection goals.

[0058] like Figure 2 As shown, this application also discloses an aluminum stranded wire, including a stranded wire body.

[0059] The stranded wire body is made by concentrically stranding aluminum wire 200 and aluminum alloy wire 100 manufactured using the aforementioned aluminum alloy wire manufacturing method. Specifically, it can be formed in one stranding process using a five-segment frame stranding machine with 90 coils or more. The stranding can employ pre-forming technology to ensure tight stranding, no protruding single wires, and that the pre-formed single wires are free from skipped strands, loose strands, or unraveling. The conductor surface is round, tight, and flat, and the outer diameter of each single wire is uniform. Compared with traditional aluminum stranded wires, under the same cross-section, the aluminum stranded wire designed in this application has higher electrical conductivity, lower DC resistance, and no hysteresis loss in AC environments, which is a significant advantage. Therefore, it has a clear advantage in annual loss cost per unit length.

[0060] The above provides a detailed description of an aluminum alloy wire manufacturing method and aluminum stranded wire provided in this application. For those skilled in the art, based on the ideas of the embodiments of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A method of manufacturing an aluminum alloy wire, characterized by, The aluminum alloy wire is composed of the following components by mass percentage: Mg 0.65-0.7%, Si 0.65-0.7%, La 0.10-0.14%, Ce 0.04-0.06%, Cr 0.02-0.04%, V 0.01-0.02%, Fe ≤0.15%, with the balance being Al and other unavoidable impurities; The manufacturing method of this aluminum alloy wire includes the following steps: The raw materials selected are A199.80 grade aluminum ingots for remelting, Mg9990 grade primary magnesium ingots, Al-20Si alloy, Al-20Cr alloy, Al-10V alloy, and lanthanum-cerium mixed rare earth. Aluminum ingots are heated and melted, and then magnesium ingots, Al-20Si alloy, Al-20Cr alloy, Al-10V alloy and lanthanum-cerium mixed rare earth are uniformly added to form an aluminum alloy melt, wherein the melting temperature is above 900℃. The aluminum alloy melt is sprayed with inert gas and / or refining agent to remove impurities in the furnace. The molten aluminum alloy is introduced into a flow channel equipped with an electromagnetic purification device for online impurity removal outside the furnace. The molten aluminum alloy is cast into an ingot, and the ingot is repeatedly rolled a predetermined number of times using a cumulative rolling method to make an aluminum alloy rod, which is then continuously quenched. The aluminum alloy rod is left to stand for a preset time before being drawn into an aluminum alloy wire. Aluminum alloy wire is obtained by aging aluminum alloy wire at 155℃~165℃ for 7h~8h.

2. The aluminum alloy wire manufacturing method according to claim 1, characterized by, The mass ratio of Mg to Si in the aluminum alloy wire is 0.88 to 1.

0.

3. The method for manufacturing aluminum alloy wire according to claim 1, characterized in that, The inert gas is nitrogen or argon; The refining agent includes sodium chloride powder or potassium chloride powder.

4. The method for manufacturing aluminum alloy wire according to claim 3, characterized in that, The inert gas also contains 5% to 25% chlorine.

5. The method for manufacturing aluminum alloy wire according to claim 1, characterized in that, The specific method of repeatedly rolling the ingot plate a preset number of times using the cumulative rolling method is as follows: The ingot is cut in half and stacked together, then rolled to half the thickness before rolling. The rolled ingot is then rolled again for a preset number of times.

6. The method for manufacturing aluminum alloy wire according to claim 1, characterized in that, The specific process of casting molten aluminum alloy into ingots is as follows: The aluminum alloy molten liquid is cast into ingots using a horizontal casting method, with a casting temperature of 700℃~720℃.

7. The method for manufacturing aluminum alloy wire according to claim 1, characterized in that, The process involves casting molten aluminum alloy into ingots, repeatedly rolling the ingots a predetermined number of times using a cumulative rolling method, and then fabricating aluminum alloy rods which undergo continuous quenching. The temperature of the ingot entering the rolling mill is controlled at 690℃, and the temperature when it is finally rolled into an aluminum alloy rod is controlled at above 240℃.

8. Aluminum stranded wire, characterized in that, Includes the stranded wire body; The stranded wire body is made by concentrically stranding aluminum wire with aluminum alloy wire manufactured using the aluminum alloy wire manufacturing method as described in any one of claims 1 to 7.

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