Aluminum alloy material for automobile high-voltage wiring harness and preparation method thereof

Abstract

The application belongs to the field of alloy materials, and particularly relates to an aluminum alloy material for automobile high-voltage wiring harness and a preparation method thereof. The aluminum alloy material for automobile high-voltage wiring harness is composed of the following components: 0.04-0.08wt% Si, 0.50-0.70wt% Fe, 0.20-0.40wt% Zr, 0.05-0.10wt% Y, 0.01-0.03wt% Sc, 0.005-0.015wt% Ti, and the balance of Al and other unavoidable impurities. The application improves the comprehensive performance of the material through innovation in the aspects of component formula, processing technology and heat treatment process, and provides a new material selection for high-voltage wiring harness of future high-end electric vehicles. The production efficiency is improved through continuous casting and rolling, the industry trend of replacing copper with aluminum is conformed to, and the rapid development of the new energy vehicle industry is promoted.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of alloy materials, and particularly relates to an aluminum alloy material for automobile high-voltage wiring harness and a preparation method thereof. BACKGROUND

[0002] The automobile wiring harness is to electrically connect each part of the automobile, and is the most basic physical condition for realizing the function of the automobile. Due to the rise of new energy vehicles, the voltage used by the automobile wiring harness is increased, and ordinary low-voltage electricity cannot meet the demand, so the demand for high-voltage wiring harness is greatly increased. Since the high-voltage wiring harness needs to carry a larger current, the overall cross-sectional area is increased and the weight is increased. In view of the development direction of the overall light weight of the automobile, the weight proportion of the copper conductor in the automobile wiring harness reaches 75%, the weight of the same volume of copper is 3.31 times that of aluminum, and the price of the same weight of copper is 3.5 times that of aluminum. However, copper has the advantages of high electrical conductivity, high strength, good toughness and the like compared with aluminum. Therefore, the current main breakthrough direction for solving the problem of high-voltage automobile wiring harness is to replace copper with aluminum. SUMMARY

[0003] In the prior art, the conductor core of the automobile wiring harness is twisted by single wires with a specification of 0.08-0.40 mm. If aluminum alloy material is used, the following problems may occur in the manufacturing process:

[0004] ①In the production and manufacturing process of aluminum alloy, oxidation inclusion and porosity defects are one of the important factors limiting the development of aluminum alloy. In the field of automobile wiring harness, the above two problems cause a high wire breaking rate when the material is drawn to a small specification. The wire drawing speed is usually below 800 m / min, and the wire drawing breaking rate is 1-3 times per 100 km.

[0005] ②In order to meet the requirements of high-voltage wiring harness, the aluminum alloy core needs to have the characteristics of high electrical conductivity and high strength. The 1370 material commonly used in the field of low-voltage wiring harness cannot meet the requirements due to its low tensile strength. In order to improve the tensile strength, some patents add alloy elements such as Mg, Cu, Mn and Cr to find a breakthrough. Although these elements can improve the strength of the material to a certain extent, they will reduce the electrical conductivity of the material (30%-50% IACS), and will affect the corrosion resistance and toughness of the material according to the different organizational forms. Overall, the disadvantages outweigh the advantages and are not suitable for promotion.

[0006] ③Low production efficiency. Most of the aluminum alloy materials used in the automobile wiring harness industry are produced by horizontal continuous casting. This method has low production efficiency, and the speed is 1.0-2.0 tons / hour.

[0007] In order to solve the above technical problems, the application provides the following technical solutions:

[0008] The application provides a preparation method of an aluminum alloy material for automobile high-voltage wiring harness, comprising the following steps:

[0009] S1: melt the aluminum ingot, add aluminum boron alloy, carry out primary refining under protective atmosphere, and obtain aluminum liquid;

[0010] S2: add the aluminum liquid to intermediate alloy at 870-900℃, mix, and obtain alloy aluminum liquid; the intermediate alloy is AlSi20, AlFe20, AlZr10, AlY10, AlSc2 and AlTi10;

[0011] S3: carry out secondary refining on the alloy aluminum liquid, and then carry out online treatment, and obtain aluminum liquid to be cast; the method of online treatment is that the alloy aluminum liquid after secondary refining is subjected to online degassing and filtration under vacuum; the filtration is carried out by using a 40-mesh filter plate;

[0012] S4: carry out horizontal continuous casting on the aluminum liquid to be cast at 740-760℃, continuously roll and quench, and obtain shaped aluminum alloy;

[0013] S5: carry out double-stage annealing on the shaped aluminum alloy, and obtain the aluminum alloy material for automobile high-voltage wire harness;

[0014] The method of double-stage annealing is that the shaped aluminum alloy is heated to 380-420℃ within 5h, is kept at temperature for 5-10h, is cooled to 320-360℃, is kept at temperature for 40-55h, is cooled to 150-200℃ in the furnace, and then is taken out of the furnace and air-cooled to room temperature, and the aluminum alloy material for automobile high-voltage wire harness is obtained;

[0015] The aluminum alloy material for automobile high-voltage wire harness consists of the following components in percentage by weight:

[0016] 0.04-0.08wt% Si, 0.50-0.70wt% Fe, 0.20-0.40wt% Zr, 0.05-0.10wt% Y, 0.01-0.03wt% Sc, 0.005-0.015wt% Ti, and the balance of Al and other unavoidable impurities.

[0017] The main procedures of the preparation method are: (1) melting; (2) alloying; (3) refining; (4) online treatment of aluminum liquid; (5) continuous casting; (6) continuous rolling; (7) cooling and coiling; and (8) annealing treatment.

[0018] Preferably, in step S1, the time for primary refining is 25-35min.

[0019] Preferably, in step S1, the aluminum liquid is obtained after primary refining, standing for 45-60min, and slagging treatment.

[0020] Preferably, in step S1, the temperature for melting is 890-920℃.

[0021] Preferably, in the step S1, the protective atmosphere is nitrogen.

[0022] After the step S1, the molten aluminum is transferred to the holding furnace using a tilting furnace. To ensure the purity of the molten aluminum, the pouring port is located in the middle or upper part of the furnace, and the precipitates and dross in the bottom and upper layer of the furnace are not poured out.

[0023] Preferably, in the step S2, the mixing method is electromagnetic stirring for 25-35 min followed by standing for 30-40 min.

[0024] Further, in the step S2, after standing for 30-40 min, samples are taken from the four corners and the center of the alloy molten aluminum for analysis of the composition, and according to the results, the material is supplemented or diluted until the composition is qualified, and the secondary refining process is entered.

[0025] Preferably, in the step S3, the secondary refining method is: under a protective atmosphere, using argon to perform powder blowing refining; the blowing speed is controlled at 1.5-2.0 kg / min, and the refining temperature is 850-880℃.

[0026] Further, granular refining agent is used during powder blowing, and the mass ratio of the granular refining agent to the alloy molten aluminum is 1.5-2:1000.

[0027] Preferably, in the step S3, after secondary refining, the furnace is soaked for 30-40 min, the slag is removed, and the standing time is 30-45 min.

[0028] Specifically, the secondary refining method is: pure high-purity nitrogen gas with a purity of ≥99.999% is blown into the molten aluminum through rotary nozzles around the holding furnace and the bottom as a protective gas to fully combine with the molten aluminum and prevent hydrogen from being precipitated from each part of the molten aluminum. At the same time, pure high-purity argon gas with a purity of ≥99.999% is used for powder blowing refining, the refining agent is granular refining agent, and the amount of the refining agent is 1.5-2.0 kg / ton, the powder blowing speed is controlled at 1.5-2.0 kg / min, the refining temperature is 850-880℃, the impurities in the molten aluminum are removed, and after refining, the furnace is soaked for 30-40 min, the slag is removed, and the standing time is 30-45 min.

[0029] Specifically, the online treatment method is: the molten aluminum is poured from the holding furnace into the flow tank, the flow tank has a piston structure and the top part is movable, the top part position is adjusted according to the liquid level to make the molten aluminum in a vacuum state and fill the flow tank. To avoid the pure molten aluminum obtained in the holding furnace from flowing into the flow tank and contacting with air to absorb hydrogen and form an oxidation film on the surface, which destroys the purity of the molten aluminum. Then the molten aluminum passes through the flow tank into the online degassing system and the filtering system, and a 40-mesh filter plate is added in the filtering box for filtering.

[0030] Preferably, in step S4, the quenching temperature is 140-180℃.

[0031] Preferably, in step S4, the horizontal continuous casting speed is 5.0-5.5 t / h, the cooling water temperature is 20-30℃, and the billet exit temperature is 480-520℃.

[0032] Preferably, in step S4, the entry temperature of the continuous rolling is 460-500℃, and the final rolling temperature is 200-300℃.

[0033] Specifically, the continuous rolling method is as follows: the billet obtained by continuous casting enters the continuous rolling process through a straightening wheel, the infeed temperature is controlled at 460-500℃, and the final rolling temperature is controlled at 200-300℃ by controlling the emulsion flow rate and pressure. Subsequently, the 9.5mm aluminum alloy rod is quenched in a pipeline, and the water flow rate and air pressure are controlled to keep the take-up temperature at 140-180℃.

[0034] The present invention also provides an aluminum alloy material for automotive high-voltage wiring harnesses prepared by the above-described preparation method.

[0035] Using the material provided by this invention, aluminum can be used to replace copper in high-voltage wiring harnesses. Compared with other aluminum alloy materials, the conductivity of the finished product meets 61% IACS, and the tensile strength can reach more than 220MPa, which is better than the tensile strength of 100-120MPa in the current industry.

[0036] This invention improves the overall performance of materials through innovations in three aspects: component formulation, processing technology, and heat treatment, providing a novel material option for high-voltage wiring harnesses used in future high-range electric vehicles. The continuous casting and rolling process enhances production efficiency, aligns with the industry trend of replacing copper with aluminum, and promotes the rapid development of the new energy vehicle industry.

[0037] The technical solution of the present invention has the following advantages compared with the prior art:

[0038] This invention relates to the alloy through its composition formulation, production process, and heat treatment process.

[0039] 1. The process protection of furnace refining + double-effect refining + piston-type flow channel ensures the purity of the melt and solves the problem of high wire breakage rate when drawing aluminum alloy materials into thin wires;

[0040] 2, Compared with other aluminum alloys in the same industry: ① use continuous casting and rolling method to produce, production efficiency reaches 5.5T / h, compared with conventional method 1.0-2.0T / h, efficiency increases 225%-550%. The finished product realizes the wire breaking rate of 1-3 times per 10,000 kilometers at the wire drawing speed of 1500m / min above. The wire drawing efficiency is increased by 1.8 times, and the wire breaking rate is reduced by 100 times. ② While ensuring the electrical conductivity of the material, the tensile strength of the material is improved to meet the requirements of automobile high-voltage wire harness.

[0041] 3, Compared with copper alloy in the same industry: the density of finished product is 2.85-2.95kg / cm 3 , the quality is reduced by 66.7% compared with copper alloy, and the price is reduced by more than 3 times.

[0042] 4, Heat treatment process: first high temperature heat treatment to promote rapid precipitation of second phase to shorten the overall heat treatment time, then low temperature long time treatment, so that the solid solution precipitates completely and is distributed in the matrix in a small and dispersed manner. Through the way of furnace cooling, energy is saved.

[0043] The key points of the present application are combined to make the finished product meet the requirements of high-voltage wire harness, realize the breakthrough of high performance, high productivity and high yield in the field of automobile high-voltage wire harness. DETAILED DESCRIPTION

[0044] The present application will be further described below in conjunction with specific examples, so that those skilled in the art can better understand the present application and implement it. However, the examples are not limiting to the present application.

[0045] According to the following table, a performance analysis is made on example 1 to example 3.

[0046] Table 1 Aluminum liquid composition of example 1 to example 3 and comparative scheme

[0047]

[0048] Example 1

[0049] (1) Melting:

[0050] In this embodiment, A199.70 remelted aluminum ingot is used, which is heated and melted to 910℃ after being put into the melting furnace, then aluminum boron alloy is added to the melt at 5.5kg / ton, melted, after melting, high-efficiency refining agent is added at 3.5kg / ton, and high-purity nitrogen gas with purity≥99.999% is used for primary refining, the refining time is 30min, and the aluminum liquid is put into the holding furnace after standing for 50min.

[0051] (2) Purification of aluminum liquid:

[0052] The molten aluminum is transferred to the holding furnace using a tilting furnace. To ensure the purity of the molten aluminum, the pouring port should be located in the middle or upper part of the furnace, and the precipitates and dross on the bottom and upper layer of the furnace should not be poured out.

[0053] (3) Alloying:

[0054] The molten aluminum is alloyed in the holding furnace at a temperature of 880°C. The intermediate alloy is added, and electromagnetic stirring is used for 30 minutes, followed by a 40-minute rest. Samples are taken from the four corners and the center of the furnace for analysis. Based on the results, the material is supplemented or diluted until the composition is qualified, and the secondary refining process is entered.

[0055] (4) Double-effect refining:

[0056] High-purity nitrogen gas with a purity of ≥99.999% is blown into the molten aluminum as a protective gas through rotating nozzles around the holding furnace and the bottom, with a total pressure of 0.15 MPa. At the same time, high-purity argon gas with a purity of ≥99.999% is used for powder blowing refining. The refining agent is granular refining agent and is added at a rate of 2.0 kg / ton. The powder blowing time is 25 minutes, and the refining temperature is 865-870°C. After refining, the furnace is stewed for 37 minutes before slagging, and the molten aluminum is left to stand for 40 minutes after slagging.

[0057] (5) Online treatment of molten aluminum:

[0058] The molten aluminum is poured from the holding furnace into the flow channel, which is a piston-type structure with a movable top. The top position is adjusted according to the liquid level to make the molten aluminum in a vacuum state and fill the flow channel. This avoids the pure molten aluminum obtained in the holding furnace from flowing into the flow channel and contacting air to absorb hydrogen and form an oxide film on the surface, which would damage the purity of the molten aluminum. Then the molten aluminum passes through the chute into the online degassing system and filtration system, and a 40-mesh filter plate is added to the filtration box for filtration.

[0059] (6) Continuous casting:

[0060] The molten aluminum after online treatment is continuously cast using horizontal casting. The casting temperature is 746°C, the casting speed is 5.18 t / h, the cooling water temperature is 23.7°C, and the ejection temperature is 483°C.

[0061] (7) Continuous rolling:

[0062] The cast billet obtained by continuous casting enters the continuous rolling process through the straightening wheel. The rolling-in temperature is controlled to be maintained at 479°C, and the finish rolling temperature is controlled to be 200°C by controlling the flow and pressure of the emulsion. Subsequently, the obtained 9.5mm aluminum alloy rod is quenched in the pipeline, and the water flow and air pressure are controlled to maintain the take-up temperature at around 172°C.

[0063] (8) Annealing treatment:

[0064] Rise to 400°C in 5 hours, keep for 10 hours, then drop to 340°C, keep for 50 hours, then stop heating, and take out after 10 hours cooling in the furnace, at this time the temperature of the aluminum rod is 166°C.

[0065] Example 2

[0066] The method is the same as Example 1, except that the content of each metal element is different, as shown in Table 1.

[0067] Example 3

[0068] The method is the same as Example 1, except that the content of each metal element is different, as shown in Table 1.

[0069] Example 4

[0070] (1) Melting:

[0071] In this example, A199.70 remelted aluminum ingot is used, which is heated and melted to 890°C after being put into the melting furnace, then boron-aluminum alloy is added to the melt at 5.5 kg / ton for melting, after melting, high-efficiency refining agent is added at 3.5 kg / ton, and high-purity nitrogen gas with purity ≥99.999% is used for primary refining, the refining time is 25 min, and the aluminum liquid is placed in the holding furnace after standing for 45 min.

[0072] (2) Purification of aluminum liquid:

[0073] The aluminum liquid is transferred to the holding furnace using a tilting furnace, and to ensure the purity of the aluminum liquid, attention should be paid to placing the aluminum outlet in the middle and upper part of the furnace, and not to place the precipitates and dross in the bottom and upper layer.

[0074] (3) Alloying:

[0075] The aluminum liquid is alloyed in the holding furnace at a temperature of 870°C, intermediate alloy is added, and electromagnetic stirring is used for 25 min, then standing for 30 min, and sampling and analyzing the composition at the four corners and center of the furnace, according to the results, supplement or dilute until the composition is qualified, and enter the secondary refining process.

[0076] (4) Double-effect refining:

[0077] High-purity nitrogen gas with purity ≥99.999% is blown into the aluminum liquid as protective gas through a rotating nozzle around the holding furnace and at the bottom, with a total pressure of 0.15 MPa. At the same time, high-purity argon gas with purity ≥99.999% is used for powder blowing refining, the refining agent is granular refining agent and is put in at 1.5 kg / ton, the powder blowing speed is controlled at 1.5 kg / min, the powder blowing time is 25 min, the refining temperature is 850-880°C, and after refining, the furnace is stewed for 30 min before slagging, and after slagging, it is standing for 30 min.

[0078] (5) Online treatment of molten aluminum:

[0079] The molten aluminum is poured from the holding furnace into a flow tank, which is a piston structure with a movable top. The top position is adjusted according to the liquid level to make the molten aluminum in a vacuum state and fill the flow tank. Then the molten aluminum passes through a chute into the online degassing system and filtration system, and a 35-mesh filter plate is added in the filtration box for filtration.

[0080] (6) Continuous casting:

[0081] The molten aluminum after online treatment is continuously cast by horizontal casting with a casting temperature of 740°C, a casting speed of 5 t / h, a cooling water temperature of 20°C, and a billet temperature of 480°C.

[0082] (7) Continuous rolling:

[0083] The cast billet obtained by continuous casting enters the continuous rolling process through a straightening wheel, and the rolling-in temperature is controlled to be maintained at 460°C. The finish rolling temperature is controlled to be 200°C by controlling the flow and pressure of emulsion. The obtained 9.5mm aluminum alloy rod is then quenched in a pipeline, and the water flow and air pressure are controlled to maintain the take-up temperature at about 140°C.

[0084] (8) Annealing treatment:

[0085] The temperature is raised to 380°C in 5 hours, and after 5 hours of holding, the temperature is lowered to 320°C, and the temperature is held for 40 hours. Then the heating is stopped, and the furnace is cooled for 10 hours before the furnace is discharged. At this time, the aluminum rod temperature is at 150°C.

[0086] Example 5

[0087] (1) Melting:

[0088] In this example, A199.70 remelted aluminum ingots are used. After being put into the melting furnace and heated to 920°C, aluminum boride alloy is added to the melt at a rate of 5.5 kg / ton for melting. After melting, high-efficiency refining agent is added at a rate of 3.5 kg / ton, and high-purity nitrogen gas with a purity of ≥99.999% is used for primary refining. The refining time is 35 min, and the molten aluminum is placed in the holding furnace after standing for 60 min.

[0089] (2) Purification of molten aluminum:

[0090] The tilting furnace is used to transfer the molten aluminum to the holding furnace. To ensure the purity of the molten aluminum, the aluminum pouring port should be placed in the middle or upper part of the furnace, and the precipitates and dross in the bottom and upper layer should not be discharged.

[0091] (3) Alloying:

[0092] The molten aluminum is alloyed in a holding furnace at a temperature of 900°C, an intermediate alloy is added, electromagnetic stirring is used for 35 minutes, and then the molten aluminum is allowed to stand for 40 minutes. Samples are taken from the four corners and the center of the furnace and analyzed for composition. Based on the results, the molten aluminum is either supplemented or diluted until the composition is acceptable, and then the molten aluminum is subjected to secondary refining.

[0093] (4) Double-effect refining:

[0094] High-purity nitrogen gas having a purity of ≥ 99.999% is blown into the molten aluminum through rotary nozzles around the holding furnace and at the bottom as protective gas at a total pressure of 0.15 MPa. At the same time, high-purity argon gas having a purity of ≥ 99.999% is used for powder blowing refining, the refining agent is a granular refining agent and is introduced at 2.0 kg / ton, the powder blowing speed is controlled at 2.0 kg / min, the powder blowing time is 25 minutes, the refining temperature is 880°C, and after refining, the molten aluminum is allowed to stand for 40 minutes after the holding furnace is covered, and then the molten aluminum is subjected to slag removal, and after slag removal, the molten aluminum is allowed to stand for 45 minutes.

[0095] (5) On-line treatment of the molten aluminum:

[0096] The molten aluminum is poured from the holding furnace into a flow channel, the flow channel has a piston structure and the top part is movable, the position of the top part is adjusted according to the liquid level so that the molten aluminum is in a vacuum state and fills the flow channel, and then the molten aluminum passes through a chute into an on-line degassing system and a filtering system, and a 45-mesh filter plate is added in the filtering box for filtering.

[0097] (6) Continuous casting:

[0098] The molten aluminum after on-line treatment is subjected to continuous casting, horizontal casting is used, the casting temperature is 760°C, the casting speed is 5.5 t / h, the cooling water temperature is 30°C, and the ejection temperature is 520°C.

[0099] (7) Continuous rolling:

[0100] The cast billet obtained by continuous casting passes through a straightening wheel and enters a continuous rolling process, the entry temperature is controlled to be maintained at 500°C, and the finish rolling temperature is controlled to be 300°C by controlling the flow rate and pressure of the emulsion, and then the 9.5 mm aluminum alloy rod material obtained is subjected to quenching treatment in a pipeline, the water flow rate and air pressure are controlled so that the take-up temperature is maintained at about 180°C.

[0101] (8) Annealing treatment:

[0102] The temperature is raised to 420°C in 5 hours, after holding for 10 hours, the temperature is lowered to 360°C, holding for 55 hours, then the heating is stopped, and the furnace is cooled for 10 hours before the aluminum rod is taken out, at this time the temperature of the aluminum rod is 200°C.

[0103] Effect evaluation 1

[0104] Table 2 Properties of the aluminum alloy rod material after heat treatment

[0105] Performance Indicators Tensile strength 220-250 Elongation ≥25％ Electrical conductivity ≥ 61 % IACS

[0106] Table 3 Finished filament performance of example and conventional product

[0107]

[0108] In combination with Table 2 and Table 3, the tensile strength of the finished filaments produced by the process of the present application can reach 240 MPa or more, the electrical conductivity can reach 61.5% IACS, and the elongation can be 16% or more. Compared with the conventional product (1370) in the industry, the tensile strength is increased by 140 MPa or more while the electrical conductivity is ensured.

[0109] Obviously, the above examples are merely illustrative and are not intended to limit the embodiments. Based on the above description, other different forms of changes or variations can be made by those of ordinary skill in the art. Here, it is not necessary and impossible to exhaust all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A method for preparing an aluminum alloy material for automotive high-voltage wiring harnesses, characterized in that, The method comprises the following steps: S1: melting aluminum ingot and adding boron-aluminum alloy to obtain aluminum liquid under a protective atmosphere; S2: adding the aluminum liquid to intermediate alloy at 870-900 ℃ to obtain alloy aluminum liquid; the intermediate alloy is AlSi20, AlFe20, AlZr10, AlY10, AlSc2 and AlTi10; S3: performing secondary refining on the alloy aluminum liquid and then performing online treatment to obtain aluminum liquid to be cast; the online treatment method is that the secondary refined alloy aluminum liquid is subjected to online degassing and filtering under a vacuum state; the filtering is performed by using a 40-mesh filter plate; S4: performing horizontal continuous casting on the aluminum liquid to be cast at 740-760 ℃, and then continuously rolling and quenching to obtain a shaped aluminum alloy; S5: performing double-stage annealing on the shaped aluminum alloy to obtain the aluminum alloy material for automobile high-voltage wire harness; The double-stage annealing method is that the shaped aluminum alloy is heated to 380-420 ℃ within 5 h, cooled to 320-360 ℃ after being kept for 5-10 h, kept for 40-55 h after being cooled to 150-200 ℃, and then taken out of the furnace and air-cooled to room temperature, to obtain the aluminum alloy material for automobile high-voltage wire harness; The aluminum alloy material for automobile high-voltage wire harness comprises the following components in percentage by weight: 0.04-0.08wt%Si, 0.50-0.70wt%Fe, 0.20-0.40wt%Zr, 0.05-0.10wt%Y, 0.01-0.03wt%Sc, 0.005-0.015wt%Ti, and the balance of Al and other unavoidable impurities.

2. The production method according to claim 1, wherein In the step S1, the time for the primary refining is 25-35 min; the aluminum liquid is obtained after being kept for 45-60 min, slagging treatment, after the primary refining.

3. The production method according to claim 1, wherein In the step S2, the mixing method is electromagnetic stirring for 25-35 min and then kept for 30-40 min.

4. The production method according to claim 1, wherein In the step S3, the online treatment method is that the secondary refined alloy aluminum liquid is subjected to online degassing and filtering after being filled in a flow tank under a vacuum state; the flow tank is a piston type structure, and the top of the flow tank is movable, and the position of the top is adjusted according to the liquid level.

5. The production method according to claim 1, wherein In the step S3, the secondary refining method is that the blowing powder refining is performed under a protective atmosphere by using argon; the blowing powder speed is 1.5-2.0 kg / min, and the refining temperature is 850-880 ℃.

6. The production method according to claim 5, wherein The particle refining agent is used during the blowing powder, and the mass ratio of the particle refining agent to the alloy aluminum liquid is 1.5-2:1000.

7. The production method according to claim 1, wherein In the step S3, the furnace is kept for 30-40 min after the secondary refining, the slag is removed, and the aluminum liquid is kept for 30-45 min.

8. The production method according to claim 1, wherein In the step S4, the horizontal continuous casting speed is 5.0-5.5 t / h, the cooling water temperature is 20-30 ℃, and the ejection temperature is 480-520 ℃.

9. The production method according to claim 1, wherein In the step S4, the continuous rolling inlet temperature is 460-500 ℃, and the finish rolling temperature is 200-300 ℃.

10. An aluminum alloy material for automobile high-voltage wire harness prepared by the preparation method in any one of claims 1-9.

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