Processing method of high-gloss aluminum plate for automotive interior

Abstract

The present application belongs to the technical field of aluminum alloy plate and strip processing, and relates to a processing method of high-gloss aluminum plate for automobile interior decoration, comprising the following steps: S1: alloy smelting and ingot casting; S2: homogenization, uniformly high-temperature heating treatment is performed on the ingot; S3: hot rolling, an ultrahigh-pressure pure water atomization jet with a water pressure of 8-15 MPa, a droplet particle size of 10-50 μm and a spray angle of 45-75° with the advancing direction of the plate surface is used to flush the aluminum plate surface between each pass of hot rolling, the aluminum plate temperature is gradually reduced by 10-30 ℃ / s after each pass of flushing is completed, the bonding force between the aluminum oxide die and the aluminum plate and the bonding strength of the sintering neck formed by the aluminum powder and the aluminum plate are gradually reduced, and after the last pass of hot rolling is completed, the aluminum plate is scanned and flushed by using a pure water atomization with a pressure of 10-15 MPa and a water temperature of 10-20 ℃. The present application solves the problem that the adhered aluminum powder and oxide skin cannot be removed during the hot rolling of the existing aluminum plate, resulting in post-rolling indentation defects and surface quality defects of the aluminum plate.

Description

Technical Field

[0001] This invention belongs to the field of aluminum alloy sheet and strip processing technology, specifically relating to a processing method for high-gloss aluminum sheets for automotive interiors. Background Technology

[0002] With the increasing demands for lightweighting and interior quality in new energy vehicles and high-end cars, aluminum alloy materials are gradually replacing traditional steel in interior components such as center consoles, trim strips, and car logos. These components require aluminum sheets to have a mirror-like high gloss finish after anodizing, with no visible defects on the surface.

[0003] Currently, the production of high-gloss automotive interior aluminum panels typically includes processes such as casting, homogenization, hot rolling, cold rolling, cleaning, annealing, and finishing. During hot rolling, the homogenized ingot needs to be rolled multiple times to achieve the required thickness. The aluminum panel is heated to 480-520℃ before hot rolling, during which a dense aluminum oxide film forms on its surface. Therefore, the surface of the unrolled aluminum panel is uneven. The micro-protrusions on this uneven surface come into direct contact with the rolls, generating strong shearing and tearing forces. This causes the surface metal to be "cut off," and the cut metal fragments separate from the substrate, forming micron-sized aluminum powder. This fine aluminum powder easily suspends in the air or adheres to the panel surface, and when rolled into the panel surface, it disrupts the flatness of the rolled panel, creating "indentation" defects. This results in a fine, orange-peel-like texture on the surface of the aluminum panel after finishing, affecting the high-gloss effect and failing to meet the quality requirements of high-end interior trims.

[0004] In existing hot rolling processes, impurities on the aluminum plate surface are removed by spraying emulsion and compressed air at both the inlet and outlet of the hot rolling mill. However, the emulsion mainly lubricates and cools the rolls, and only some floating dust is carried away by the flow of the emulsion. The compressed air purging uses high-pressure gas to blow away the residual emulsion and aluminum powder from the plate surface, preventing the oil in the emulsion from forming oil mist at high temperatures, which would then condense and form oil-containing droplets that would contaminate the plate surface. However, at high temperatures, aluminum powder and the aluminum matrix undergo solid-state diffusion sintering, forming a metallurgical bonding neck at the contact area, essentially "welded" to the aluminum. On the surface of the sheet, the alumina film formed on the aluminum sheet at high temperature is not a flat cover, but grows into the aluminum matrix in the form of columnar crystals or needles, forming a structure similar to "tree roots" or "anchors" that penetrates deep into the aluminum matrix. During the hot rolling process, the aluminum matrix undergoes plastic flow, which wraps and embeds the aluminum powder and alumina film in the surface layer. With the more times it is rolled, the aluminum powder and alumina film are tightly surrounded by the deformed aluminum matrix, resulting in greater adhesion. Therefore, conventional emulsion and compressed air purging cannot remove the adhered aluminum powder and alumina, leading to post-rolling press-in defects and surface quality defects in the aluminum sheet. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, this invention provides a processing method for high-gloss aluminum panels for automotive interiors. This method solves the problem that existing aluminum panels cannot remove adhering aluminum powder and oxide scale during hot rolling, leading to post-rolling pressing defects and surface quality defects in the aluminum panels.

[0006] The objective of this invention can be achieved through the following technical solution: a processing method for high-gloss aluminum panels for automotive interiors, comprising the following steps: S1: Alloy smelting and casting: aluminum alloy is prepared according to mass percentage and smelted to form ingots; S2: Homogenization, which involves uniformly heating the ingot at high temperatures; S3: Hot rolling. Between each hot rolling pass, an ultra-high pressure pure water atomized jet with a water pressure of 8-15 MPa, a droplet size of 10-50 μm, and a spray angle of 45-75° with the front direction of the plate is used to rinse the aluminum plate surface. After each rinsing pass, the aluminum plate temperature is gradually reduced by 10-30℃ / s, gradually reducing the bonding force between the alumina mold and the aluminum plate, as well as the bonding strength between the aluminum powder and the aluminum plate to form the sintering neck. After the last hot rolling pass, a scanning rinse of the aluminum plate is performed using pure water atomization with a pressure of 10-15 MPa and a water temperature of 10-20℃.

[0007] As a preferred embodiment of the present invention, in step S3, 0.05-0.1 wt% of a fluorinated surfactant is added to the sprayed pure water.

[0008] As a preferred technical solution of the present invention, in step S3, the cooling rate of the aluminum plate after the last pure water atomization rinse is 50-100℃ / s.

[0009] As a preferred technical solution of the present invention, in step S3, compressed air is used to blow the impurities washed by the ultra-high pressure pure water atomized jet into the negative pressure dust collection mechanism by spraying air into the rear section of the rinsing area.

[0010] As a preferred embodiment of the present invention, in step S3, the pressure of the compressed air knife is 0.4-0.6 MPa.

[0011] As a preferred embodiment of the present invention, in step S3, the compressed air air knife ejected is an ion air knife.

[0012] As a preferred embodiment of the present invention, in step S1, the Fe / Si atomic ratio in the aluminum alloy is 0.9-1.1.

[0013] As a preferred technical solution of the present invention, in step S2, the ingot is first heated to 590-610°C and held for 2-4 hours, then cooled to 440-460°C at a cooling rate of ≥100°C / h, and then air-cooled to room temperature.

[0014] As a preferred embodiment of the present invention, in step S2, the air cooling rate is ≥5℃ / s.

[0015] The beneficial effects of this invention are as follows: By spraying ultra-high pressure pure water mist onto the surface of hot-rolled aluminum plate, the temperature of the aluminum plate gradually decreases during the hot rolling process, thereby reducing the bonding force between the alumina mold and the aluminum plate, as well as the bonding strength of the aluminum powder and the aluminum plate forming the sintering neck. The high-speed impact of the water flow generates high shear force and pulse effect, producing strong tangential stress at the interface between the contaminant and the substrate. This stress will be greater than the bonding force between the contaminant and the substrate when the bonding force and bonding strength gradually decrease, thereby causing the oxide scale and aluminum powder to peel off from the plate surface. This solves the problem that existing aluminum plates cannot remove the adhered aluminum powder and oxide scale during the hot rolling process, resulting in post-rolling press-in defects and surface quality defects in the aluminum plate. Attached Figure Description

[0016] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a flowchart of the atomized rinsing process method of the present invention. Detailed Implementation

[0018] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0019] Please see Figure 1 This embodiment provides a method for processing high-gloss aluminum panels for automotive interiors, including the following steps: S1: Alloy smelting and casting: aluminum alloy is prepared according to mass percentage and smelted to form ingots; S2: Homogenization, which involves uniformly heating the ingot at high temperature to address the uneven grain composition distribution caused by excessively rapid cooling during solidification. This homogenization process allows atoms to diffuse fully, resulting in a more uniform composition and preventing the accumulation of internal stress within the ingot due to uneven grain composition. S3: Hot rolling. The homogenized ingot is reheated to give it good plasticity for rolling with large deformation. The ingot is then rolled through multiple hot rolling rolls to obtain the required dimensions. Between each hot rolling pass, an ultra-high pressure pure water atomized jet with a water pressure of 8-15MPa, a droplet size of 10-50μm, and a spray angle of 45-75° with the front direction of the plate is used to wash the aluminum plate surface. After each washing pass, the aluminum plate temperature is gradually reduced by 10-30℃ / s, which generates transverse shear stress between the alumina mold and the aluminum plate, gradually reducing the bonding force between the alumina mold and the aluminum plate, as well as the bonding strength of the aluminum powder and the aluminum plate to form the sintering neck. After the last hot rolling pass, the aluminum plate is scanned and washed with pure water atomization at a pressure of 10-15MPa and a water temperature of 10-20℃.

[0020] With the increasing demands for lightweighting and interior quality in new energy vehicles, aluminum alloy materials are gradually replacing traditional steel in interior components such as center consoles and trim strips. These components require aluminum sheets to have a mirror-like high gloss after anodizing, with no visible defects on the surface. Automotive interior aluminum sheets require processes such as casting, homogenization, hot rolling, cold rolling, cleaning, annealing, and finishing. Downstream customers then require anodizing and coloring treatments. However, after anodizing, two typical defects frequently appear on the surface: black polishing lines and orange peel texture.

[0021] Orange peel texture, characterized by a fine, uneven surface resembling orange peel under high gloss, is primarily formed during the hot rolling process. During rolling, some oxide scale fragments and aluminum powder are pressed into the sheet surface by the rolls, creating "indentations" that result in a fine, uneven texture on the finished aluminum sheet. Current hot rolling processes remove impurities from the aluminum sheet surface through emulsion flushing and compressed air purging. However, these methods cannot completely remove the aluminum powder and oxide scale adhering to the aluminum sheet surface.

[0022] Aluminum powder and the aluminum matrix undergo solid-state diffusion sintering at high temperatures, forming a metallurgical bonding neck with a bonding strength of 5-15 MPa. The oxide film grows into the matrix in a columnar crystalline morphology, forming a "pinned" structure. Peeling off requires overcoming a mechanical interlocking force of 8-20 MPa. In contrast, the physical adsorption force of conventional floating dust is only 0.01-0.1 MPa. The pressure of existing emulsion spraying is only 0.3-0.8 MPa, and the upper limit of the safe pressure for compressed air purging is only 0.4-0.6 MPa.

[0023] Therefore, to solve the above problems, in this invention, an ultra-high pressure pure water atomizing jet mechanism is installed next to the compressed air purging device. This mechanism sprays an ultra-high pressure pure water atomizing jet with a pressure of 8-15 MPa, a droplet size of 10-50 μm, and an angle of 45-75° with the forward direction of the plate during the rolling process to rinse the aluminum plate surface. Because aluminum has a high thermal conductivity, and the sprayed water is a water mist with droplet sizes between 10-50 μm, when the high-temperature aluminum plate comes into contact with the water mist, a thermal stress peeling effect is triggered on the high-temperature aluminum plate. The bottom of the water mist instantly vaporizes to form a continuous, stable layer. A fixed vapor film separates the liquid from the hot surface, causing a sharp decrease in heat exchange efficiency. However, because the water jet pressure in this application is 8-15 MPa and the jet is sprayed at a 45-75° angle, the oblique impact generates shear force, allowing some water mist to penetrate the outer layer of the vapor film and contact the aluminum plate. This lowers the surface temperature of the aluminum plate. Since the amount of water mist penetrating is relatively small, the temperature drop is relatively low, controlling the plate surface temperature drop to 10-30°C. The difference in thermal expansion coefficients between the oxide scale and the aluminum substrate causes asynchronous contraction, resulting in transverse shear stress at the contact surface between the oxide scale and the aluminum substrate. The force further weakens the bonding force between the oxide scale and the substrate, thus allowing for better peeling of the high-temperature oxide scale under high-pressure water jet impact. Simultaneously, due to the gradual decrease in temperature, the diffusion rate of aluminum powder atoms decreases, leading to a weakening of the bonding force between the aluminum powder and the aluminum plate forming the sintering neck. Furthermore, through each high-pressure rinsing process, the bonding force between the alumina mold and the aluminum plate, as well as the bonding strength between the aluminum powder and the aluminum plate forming the sintering neck, gradually decreases until the final hot rolling is completed. Then, a higher pressure (10-15 MPa) and a water temperature (10-20℃) pure water atomization is used to scan and rinse the aluminum plate. At this point, the water jet impacts the plate surface at a flat angle. The high-speed impact of the water flow also generates high shear force and pulse effect, resulting in strong tangential stress at the interface between the contaminants and the substrate. This stress far exceeds the gradually weakening bonding force between the contaminants and the substrate, causing the oxide scale and aluminum powder to peel off from the plate surface. Moreover, when ultra-high pressure pure water mist is sprayed onto the surface of the aluminum plate, extremely fine droplets will penetrate into the micro-cracks between the oxide scale and the substrate. When the pressure applied by the penetrating water is greater than the attraction between the particles, the contaminant layer will generate cracks from the inside and gradually spread. Once the cracks are formed, the subsequent jet will continue to compress and shear these cracks, causing the contaminant layer to disintegrate from the inside and eventually peel off.

[0024] During the rolling process, the temperature of the aluminum sheet decreases uniformly, thus avoiding dimensional deformation caused by internal stress due to temperature differences during hot rolling.

[0025] During the hot rolling process of aluminum plates, the ingot needs to pass through the rolls repeatedly, and the rolling direction changes alternately. During this process, the thickness of the aluminum plate will gradually decrease so that the size of the aluminum plate meets the preset requirements. Therefore, in order to better remove impurities from the surface of the aluminum plate during the rolling process, the water pressure and droplet size are adjusted according to the different thicknesses of the aluminum plate to remove impurities.

[0026] Because the aluminum sheet needs to be heated before rolling, its temperature remains high after rolling. If the sheet is allowed to cool slowly in the air, some of the internal crystals will continue to grow, and this uneven grain size will result in an orange peel texture after anodizing. Therefore, high-pressure, low-temperature water mist rapid cooling generates sufficient high-speed droplets to break through or bypass the vapor film, allowing water to directly contact the sheet surface for efficient heat exchange. Furthermore, due to the low yield strength and high thermal conductivity of aluminum at high temperatures, and the properties of aluminum alloys... No volume expansion phase transformation occurs during rapid cooling. Therefore, when the aluminum plate is cooled rapidly, heat can be quickly conducted from the inside to the surface, which quickly homogenizes the temperature gradient and relieves stress more quickly. Moreover, even if there are slight changes in size, they can be corrected by subsequent cold rolling and bending straightening. Therefore, after the final hot rolling, the aluminum plate is swept by pure water atomization at a pressure of 10-15MPa and a temperature of 10-20℃. This is sufficient to freeze the grains and eliminate orange peel texture without causing harmful dimensional changes or residual stress.

[0027] To improve the penetration ability of the droplets and make it easier to peel off the aluminum powder and oxide scale adhering to the aluminum plate surface, in this embodiment, 0.05-0.1 wt% of a fluorinated surfactant is added to the sprayed pure water in step S3. By adding a trace amount of fluorinated surfactant to the high-pressure pure water atomized jet, and because fluorinated surfactant is currently known to have the strongest surface tension reduction ability and extremely high thermal stability, it can maintain its activity and not decompose under the high temperature environment of hot rolling, the surface tension of the pure water is significantly reduced by adding 0.05-0.1 wt% of fluorinated surfactant, thereby enhancing the water wedge effect and thus better peeling off the aluminum powder or oxide scale.

[0028] To better avoid excessive cooling rate of the aluminum sheet during the final hot rolling process, which could lead to loss of shape control and excessive residual stress due to thermal stress, and to eliminate the orange peel texture caused by changes in grain size, in this embodiment, the cooling rate of the aluminum sheet in the final pure water atomization rinse in step S3 is 50-100℃ / s. The recrystallization grain growth in the hot-rolled aluminum sheet is a thermally activated diffusion process that requires a certain time and temperature window. Moreover, if the aluminum sheet stays in the sensitive temperature range of 450-300℃ for too long, sufficient time will be allowed for grain boundary migration, leading to grain growth. Therefore, by controlling the cooling rate of the hot-rolled aluminum sheet, the grain size can be controlled while reducing residual thermal stress within the aluminum sheet. This achieves the elimination of orange peel texture, resulting in a high-gloss aluminum sheet, while also controlling the size of the sheet shape.

[0029] To prevent impurities removed by high-pressure pure water atomization from re-adhering to the aluminum plate and affecting cleaning efficiency, in this embodiment, in step S3, compressed air is used to blow the washed impurities into the negative pressure dust collection mechanism by spraying air into the rear section of the ultra-high pressure pure water atomization jet. Since aluminum powder and oxide scale after high-pressure water mist washing will fall back onto the plate surface and cause secondary pollution if they are not actively and directionally collected, or accumulate in the washing area and affect subsequent operation, the impurities are collected by compressed air atomization and negative pressure dust collection mechanism. This avoids the situation where aluminum powder and oxide scale gradually accumulate below the washing area and form a sludge layer. At the same time, the negative pressure dust collection mechanism can also recycle the washing water mist and prevent the dispersed water mist from re-adsorbing dust in the air and condensing to cause secondary dust pollution.

[0030] In order to better disperse the water droplets remaining after high-pressure pure water atomization rinsing and prevent impurities from being blown outside the coverage area of ​​the negative pressure suction port, thereby reducing the collection efficiency of impurities, in this embodiment, the pressure of the compressed air knife in step S3 is 0.4-0.6MPa. By controlling the pressure of the compressed air knife, the situation of water film and suspended particles remaining on the surface of the aluminum plate after water mist rinsing is avoided. At the same time, it also avoids that the impact of excessively high-pressure airflow will cause aeroelastic instability and "blow" the particles outside the coverage area of ​​the negative pressure suction port, thereby reducing the collection efficiency.

[0031] To better prevent secondary pollution caused by electrostatic adsorption of fine dust from the surrounding air on the dried board surface, in this embodiment, the compressed air air knife sprayed out in step S3 is an ion air knife. By making the compressed air air knife sprayed out as an ion air knife, the static charge generated by friction on the surface of the aluminum plate is neutralized, thereby preventing secondary pollution caused by electrostatic adsorption of fine dust from the surrounding air on the dried board surface.

[0032] During the solidification process of aluminum alloy ingots, Fe and Si elements form intermetallic compounds. In conventional ingot solidification, coarse needle-like or lath-like β-Al phases preferentially precipitate. This phase has high hardness and a large difference in electrochemical potential with the aluminum matrix. During subsequent chemical polishing or electrolytic polishing, the β phase acts as the cathode, and the surrounding aluminum matrix is ​​preferentially dissolved, forming micron-sized protrusions or pits, which appear as fine black lines under high light, known as "polishing black lines". Although existing technologies employ homogenization annealing, heating to 540-580℃, holding for 6-12 hours, and then air-cooling to room temperature to transform the β phase into fine α-Al(Fe,Mn)Si phase, the coarse β phase often fails to transform completely due to insufficient temperature, time, or improper cooling methods. Black line defects still exist, and even if offline alkaline washing or acid washing processes are added later, the β phase already present in the alloy cannot be eliminated. In contrast, the α phase is fine and diffusely distributed, and its potential is close to that of the aluminum matrix, so it does not cause selective dissolution. During the cooling process after melting and casting, the α phase will preferentially form. As the ingot cools and solidifies more slowly, silicon will continuously accumulate in the melt, thus causing the α phase to chemically transform into the β phase.

[0033] Therefore, in order to control the size of the β-AlFeSi phase by adjusting the Fe / Si atomic ratio, thereby avoiding the occurrence of polishing black lines during the subsequent anodizing process and resulting in a uniform, flawless, high-gloss mirror finish on the aluminum plate, in this embodiment, the Fe / Si atomic ratio in the aluminum alloy is 0.9-1.1 in step S1. Since the Fe / Si atomic ratio is a key parameter determining the type of precipitated phase during solidification and homogenization, and in conventional production, Fe and Si are often treated as impurities or trace elements, their content is often controlled only by controlling the upper limit of the elemental composition rather than the proportion, leading to fluctuations in the β-phase content between different furnace cycles. The surface quality fluctuates greatly due to the large fluctuations in the Fe / Si atomic ratio. When the Fe / Si ratio is greater than 1.1, the iron content in the ingot is excessive while silicon is relatively scarce. At this time, the α phase becomes the preferred stable phase for precipitation, and the excessive iron content will also form the Al3Fe phase. However, the formed α phase will be too coarse, affecting the surface quality. When the Fe / Si ratio is less than 0.9, the silicon in the melt is severely excessive. In addition to forming the β phase, free silicon will also appear, which will seriously affect the surface quality of the finished product. Therefore, by controlling the ratio of the two trace elements Fe and Si, rather than just the ratio of the main element, the formation of polishing black lines can be avoided.

[0034] Since the β phase and α phase exhibit different changes at different temperatures, when the temperature is too low, the diffusion rate of Fe and Si atoms is insufficient, and the β-to-α phase transformation is slow; moreover, when the cooling rate is too slow, the dissolved Fe and Si will re-precipitate as coarse β phase.

[0035] Therefore, by controlling the temperature for homogenization of the ingot, the formation and size of the β phase can be controlled, thereby better eliminating the formation of polishing black lines. In this embodiment, in step S2, the ingot is first heated to 590-610℃ and held for 2-4 hours, then cooled to 440-460℃ at a cooling rate of ≥100℃ / h, and then air-cooled to room temperature. By first increasing the temperature, the diffusion rate of Fe and Si atoms is accelerated, allowing the β phase to dissolve and transform into the α phase in a shorter time. Then, the temperature is rapidly reduced to decrease the diffusion rate of Fe and Si atoms, thereby preventing Fe and Si from precipitating coarse β phases again. The rapid heating causes the β phase to transform into the α phase, and the rapid cooling prevents the β phase from re-precipitating, thereby reducing the formation of polishing black lines.

[0036] During the high-temperature holding stage at 590-610℃, the harmful β phase has been transformed into a fine α phase through atomic diffusion. However, if the cooling process is too slow in the subsequent cooling process, the α phase will transform into an unstable α' phase, resulting in large coarse compounds. This will seriously reduce the strength, plasticity, and surface finish of the alloy. Moreover, slow cooling will also cause Fe and Si to re-aggregate and form coarse β phases during the slow cooling process.

[0037] Therefore, in order to improve product quality stability while reducing the formation of polishing black lines, in this embodiment, in step S2, the air cooling rate is ≥5℃ / s. By controlling the air cooling rate, it is possible to effectively avoid the difference in structure between the surface and the core caused by uneven heat dissipation, ensuring that the structure and properties of the entire ingot are highly consistent, improving product quality stability, and reducing the formation of polishing black lines.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for processing high-gloss aluminum panels for automotive interiors, characterized in that, Includes the following steps: S1: Alloy smelting and casting: aluminum alloy is prepared according to mass percentage and smelted to form ingots; S2: Homogenization, which involves uniformly heating the ingot at high temperatures; S3: Hot rolling. Between each hot rolling pass, an ultra-high pressure pure water atomized jet with a water pressure of 8-15 MPa, a droplet size of 10-50 μm, and a spray angle of 45-75° with the front direction of the plate is used to rinse the aluminum plate surface. After each rinsing pass, the aluminum plate temperature is gradually reduced by 10-30℃ / s, gradually reducing the bonding force between the alumina mold and the aluminum plate, as well as the bonding strength between the aluminum powder and the aluminum plate to form the sintering neck. After the last hot rolling pass, a scanning rinse of the aluminum plate is performed using pure water atomization with a pressure of 10-15 MPa and a water temperature of 10-20℃.

2. The processing method of a high-gloss aluminum sheet for automotive interiors according to claim 1, characterized in that: In step S3, 0.05-0.1 wt% of a fluorinated surfactant is added to the sprayed pure water.

3. The processing method of a high-gloss aluminum sheet for automotive interiors according to claim 1, characterized in that: In step S3, the cooling rate of the aluminum plate after the final pure water atomization rinse is 50-100℃ / s.

4. The processing method of a high-gloss aluminum sheet for automotive interiors according to claim 1, characterized in that: In step S3, compressed air is used to blow the impurities washed out into the negative pressure dust collection mechanism by spraying air into the rear section of the ultra-high pressure pure water atomized jet.

5. The processing method of a high-gloss aluminum sheet for automotive interiors according to claim 4, characterized in that: In step S3, the pressure of the compressed air knife is 0.4-0.6 MPa.

6. The processing method of a high-gloss aluminum sheet for automotive interiors according to claim 4, characterized in that: In step S3, the compressed air air knife ejected is an ion air knife.

7. The processing method of a high-gloss aluminum sheet for automotive interiors according to claim 1, characterized in that: In step S1, the Fe / Si atomic ratio in the aluminum alloy is 0.9-1.

1.

8. The processing method of a high-gloss aluminum sheet for automotive interiors according to claim 1, characterized in that: In step S2, the ingot is first heated to 590-610℃ and held for 2-4 hours, then cooled to 440-460℃ at a cooling rate of ≥100℃ / h, and then air-cooled to room temperature.

9. The processing method of a high-gloss aluminum sheet for automotive interiors according to claim 8, characterized in that: In step S2, the air cooling rate is ≥5℃ / s.

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