Aluminum material for lens barrel of vehicle-mounted lens, processing method of aluminum material and lens barrel of vehicle-mounted lens

Abstract

The invention provides an aluminum material for a lens cone of a vehicle-mounted lens, a processing method of the aluminum material and the lens cone of the vehicle-mounted lens. The aluminum material for the lens cone of the vehicle-mounted lens at least comprises the following components in percentage by weight: 0.3%-0.35% of Cr as an additive; 0.05% to 0.07% of Sc; 0.02% to 0.03% of Yb; 0.015% to 0.03% of P; 0.003% to 0.008% of B; and a main component: the remainder Al. The aluminum material for the lens barrel of the vehicle-mounted lens contains at least 95% of Al. According to the aluminum material for the lens cone of the vehicle-mounted lens, on the basis of ensuring the corrosion resistance of the aluminum material adopted by the vehicle-mounted lens, the formation of heterochromatic oxidation spots can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aluminum material manufacturing, in particular to an aluminum material for a lens barrel of a vehicle-mounted lens, a processing method thereof, and the lens barrel of the vehicle-mounted lens. BACKGROUND

[0002] The lens barrel of the vehicle-mounted lens is prepared from aluminum material. The main component of the aluminum material is aluminum, and a small amount of other metals is also added as an additive for performance improvement. In addition, there is a very small amount of impurities in the aluminum material that cannot be removed.

[0003] Among them, the addition of Cr in the additive can greatly improve the corrosion resistance of the lens barrel, but at the same time, the addition of Cr also promotes the formation of heterochromatic oxidation spots. The formation of heterochromatic oxidation spots is mainly that Cr is more likely to form coarse Al-Cr composite phases during the preparation of the lens barrel. After anodic oxidation, gray-green oxidation spots will be formed. Although the presence of Fe and Si can combine with Cr to form Cr-Fe-Si composite phases and Cr-Fe-Al composite phases, if the addition amount of Fe and Si is increased to form more Cr-Fe-Si composite phases and Cr-Fe-Al composite phases, due to the large mass of Cr-Fe-Si composite phases and Cr-Fe-Al composite phases, they are also easy to segregate and aggregate, which causes the formation of golden yellow oxidation spots after anodic oxidation of the aluminum material. Although controlling the content of Cr, Fe and Si can effectively reduce the formation of heterochromatic oxidation spots, when the content of Cr needs to be adjusted to be relatively high in order to meet the demand for high corrosion resistance of the lens barrel, the content of Fe and Si cannot be correspondingly increased by a large amount, which still causes the formed heterochromatic oxidation spots to affect the appearance of the lens barrel, and affect the mechanical properties and optical properties of the lens barrel. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings in the prior art and provide an aluminum material for a lens barrel of a vehicle-mounted lens and a processing method thereof, and the lens barrel of the vehicle-mounted lens, which can reduce the formation of heterochromatic oxidation spots while ensuring the corrosion resistance of the aluminum material used in the lens barrel of the vehicle-mounted lens.

[0005] The purpose of the present application is achieved by the following technical solutions: An aluminum material for a lens barrel of a vehicle-mounted lens, comprising the following components in percentage: additive: Cr 0.3%~0.35%; Sc 0.05%~0.07%; Yb 0.02%~0.03%; P 0.015%~0.03%; B 0.003%~0.008%; main component: Al balance; In the aluminum material for the lens barrel of the vehicle-mounted lens, at least 95% of Al is contained.

[0006] In one embodiment, the additive further comprises the following percentages of each component: Fe ≤0.18%; Si 0.4%~0.5%.

[0007] In one embodiment, the additive further comprises at least part of the following percentages of each component: Mn 0.1%~0.15%; Ti 0.02%~0.05%; Mg 0.8%~1.2%; Cu 0.15%~0.40%; Zn 0.05%~0.25%.

[0008] In one embodiment, the aluminum material for the lens barrel of the vehicle-mounted lens further contains impurities, the content of the impurities is ≤0.15%, and the content of a single substance in the impurities is ≤0.05%.

[0009] A processing method of an aluminum material for a lens barrel of a vehicle-mounted lens, used for processing the aluminum material for the lens barrel of the vehicle-mounted lens in any of the above embodiments, the processing method of the aluminum material for the lens barrel of the vehicle-mounted lens comprises the following steps: Obtaining a pure aluminum ingot and an additive; Performing an alloying smelting operation on the pure aluminum ingot and the additive to obtain an aluminum alloy melt; Performing an ingot casting operation on the aluminum alloy melt to obtain an aluminum alloy ingot; Performing an extrusion molding operation on the aluminum alloy ingot to obtain a rod-shaped aluminum material for the lens barrel of the vehicle-mounted lens.

[0010] In one embodiment, the alloying smelting operation on the pure aluminum ingot and the additive is performed under magnetic stirring.

[0011] The alloying smelting operation on the pure aluminum ingot and the additive comprises the following operation steps: Adding 50% of Sc, P and Ti together into the pure aluminum ingot to perform a first-order smelting treatment to obtain a pre-melt; Adding B and Si into the pre-melt in sequence to perform a second-order smelting treatment; Adding the remaining 50% of Sc and Yb into the melt after the second-order smelting treatment in sequence to perform a third-order smelting treatment; Adding the remaining additive into the pre-melt after the third-order smelting treatment to perform a fourth-order smelting treatment.

[0012] In one embodiment, the aluminum alloy melt is subjected to an ingot casting operation under ultrasonic vibration conditions.

[0013] In one embodiment, after the step of extruding the aluminum alloy ingot, the method for processing the aluminum material for the lens barrel of the automotive lens further includes the following steps: The aluminum material used for the lens barrel of the vehicle-mounted lens is heat-treated.

[0014] A lens barrel for a vehicle-mounted lens is made from aluminum material for a vehicle-mounted lens barrel, processed using the aluminum material processing method described in any of the above embodiments.

[0015] Compared with the prior art, the present invention has at least the following advantages: The aluminum material used for the lens barrel of the vehicle-mounted lens of the present invention has a Cr content of 0.3%~0.35%, which effectively ensures the corrosion resistance of the aluminum material used for the lens barrel of the vehicle-mounted lens, especially suitable for humid environments. In addition, 0.05%~0.07% Sc, 0.02%~0.03% Yb and 0.003%~0.008% B are added, which preferentially form a composite phase in Al as a heterogeneous nucleation core. Combined with 0.3%~0.35% Cr, it promotes the formation of a coherent interface between the heterogeneous nucleation core and Cr atoms, so that Cr is fully and effectively coherently adsorbed on the heterogeneous nucleation core, and the formed coherent interface is clear. This effectively prevents Cr segregation and the resulting coarsening and uneven distribution of Cr grains, and improves the uniformity and dispersion stability of Cr. Detailed Implementation

[0016] The present application will be further described in detail below with reference to the embodiments and examples. It should be understood that these embodiments and examples are for illustrative purposes only and are not intended to limit the scope of the present application. The purpose of providing these embodiments and examples is to enable a more thorough and comprehensive understanding of the disclosure of the present application. It should also be understood that the present application can be implemented in many different forms and is not limited to the embodiments and examples described herein. Those skilled in the art can make various modifications or alterations without departing from the spirit of the present application, and the equivalent forms obtained also fall within the protection scope of the present application. Furthermore, numerous specific details are set forth in the following description to provide a fuller understanding of the present application. It should be understood that the present application can be implemented without one or more of these details.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0018] In this invention, the technical features described in an open-ended manner include both closed-ended technical solutions composed of the listed features and open-ended technical solutions that include the listed features.

[0019] In this invention, numerical intervals (i.e., numerical ranges) are involved. Unless otherwise specified, the selected numerical distributions within the aforementioned numerical intervals are considered continuous, and include the two endpoints (i.e., the minimum and maximum values) of the numerical range, as well as every value between these two endpoints. Unless otherwise specified, when a numerical interval refers only to integers within that interval, it includes the two endpoint integers of the numerical range, as well as every integer between the two endpoints. In this document, this is equivalent to directly listing every integer. For example, if t is an integer selected from 1 to 10, it means that t is any integer selected from the group of integers consisting of 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10. Furthermore, when multiple ranges are provided to describe features or characteristics, these ranges can be merged. In other words, unless otherwise specified, the ranges disclosed herein should be understood to include any and all subranges to which they are included.

[0020] Unless otherwise specified, the temperature parameters in this invention can be either constant temperature treatment or vary within a certain temperature range. It should be understood that constant temperature treatment allows temperature fluctuations within the precision range controlled by the instrument. Fluctuations are permitted within ranges such as ±5℃, ±4℃, ±3℃, ±2℃, and ±1℃.

[0021] This application provides an aluminum material for the lens barrel of an automotive lens. The aluminum material for the lens barrel of the aforementioned automotive lens comprises a main component, additives, and impurities. Further, the aluminum material for the lens barrel of the aforementioned automotive lens comprises at least the following components in percentage content: Additives: 0.3%~0.35% Cr; 0.05%~0.07% Sc; 0.02%~0.03% Yb; 0.015%~0.03% P; 0.003%~0.008% B; Main component: balance Al. The aluminum material for the lens barrel of the automotive lens contains at least 95% Al.

[0022] The aluminum material used in the lens barrel of the aforementioned automotive lens has a Cr content of 0.3%~0.35%, which effectively ensures the corrosion resistance of the aluminum material used in the lens barrel of the automotive lens, especially suitable for humid environments. In addition, 0.05%~0.07% Sc, 0.02%~0.03% Yb and 0.003%~0.008% B are added, which preferentially form a composite phase in Al as a heterogeneous nucleation core. Combined with 0.3%~0.35% Cr, it promotes the formation of a coherent interface between the heterogeneous nucleation core and Cr atoms, so that Cr is fully and effectively coherently adsorbed on the heterogeneous nucleation core, and the formed coherent interface is clear. This effectively prevents Cr segregation and the resulting coarsening and uneven distribution of Cr grains, and improves the uniformity and dispersion stability of Cr.

[0023] To better understand the aluminum material used in the lens barrel of the automotive lens of this application, the following is a further explanation of the aluminum material used in the lens barrel of the automotive lens of this application: The aluminum material used for the lens barrel of the vehicle-mounted lens according to one embodiment comprises at least the following components in percentage: Additives: 0.3%~0.35% Cr; 0.05%~0.07% Sc; 0.02%~0.03% Yb; 0.015%~0.03% P; 0.003%~0.008% B; Main component: Balance Al. The aluminum material used for the lens barrel of the vehicle-mounted lens contains at least 95% Al.

[0024] The aluminum material used in the lens barrel of the aforementioned automotive lens has a Cr content of 0.3%~0.35%, which effectively ensures the corrosion resistance of the aluminum material used in the lens barrel of the automotive lens, especially suitable for humid environments. In addition, 0.05%~0.07% Sc, 0.02%~0.03% Yb and 0.003%~0.008% B are added, which preferentially form a composite phase in Al as a heterogeneous nucleation core. Combined with 0.3%~0.35% Cr, it promotes the formation of a coherent interface between the heterogeneous nucleation core and Cr atoms, so that Cr is fully and effectively coherently adsorbed on the heterogeneous nucleation core, and the formed coherent interface is clear. This effectively prevents Cr segregation and the resulting coarsening and uneven distribution of Cr grains, and improves the uniformity and dispersion stability of Cr.

[0025] In one embodiment, the additive further includes the following components in percentage amounts: Fe ≤ 0.18%; Si 0.4%~0.5%. It is understood that Si and Fe are primarily introduced as impurities from pure aluminum ingots. In practice, the aluminum material used for the lens barrel of automotive lenses may not contain additional Si and Fe, primarily due to restrictions on the Si and Fe content in the pure aluminum ingots used. Furthermore, the aluminum material used for the lens barrel of automotive lenses also contains impurities, with an impurity content ≤ 0.15%, and the content of any single impurity substance ≤ 0.05%.

[0026] In one embodiment, the additive further includes the following components in percentage amounts: 0.1%~0.15%Mn; 0.02%~0.05%Ti; 0.8%~1.2%Mg; 0.15%~0.40%Cu; 0.05%~0.25%Zn.

[0027] This application also provides a method for processing aluminum material for the lens barrel of an automotive lens, used to obtain the aluminum material for the lens barrel of the automotive lens according to any of the above embodiments. The above-described method for processing aluminum material for the lens barrel of an automotive lens includes the following steps: To obtain pure aluminum ingots and additives; Aluminum alloy melt is obtained by alloying and smelting pure aluminum ingots and additives. The aluminum alloy molten material is cast into an ingot to obtain an aluminum alloy ingot. An aluminum alloy ingot is extruded to obtain a rod-shaped aluminum material for the lens barrel of an automotive lens.

[0028] It can be understood that pure aluminum ingots are industrial pure aluminum ingots with a purity of ≥99.0%, such as Al99.0, Al99.7 and Al99.9, with Al99.97 being preferred. Pure aluminum ingots are conventional aluminum ingots used to process aluminum lens barrels for automotive lenses, so they will not be discussed further here.

[0029] To better understand the processing method of the aluminum material for the lens barrel of the automotive lens of this application, the processing method of the aluminum material for the lens barrel of the automotive lens of this application will be further explained below: A method for processing aluminum material for the lens barrel of a vehicle-mounted lens according to one embodiment includes the following steps: S100, obtaining pure aluminum ingots and additives; S200: Alloying and smelting pure aluminum ingots and additives to obtain aluminum alloy melt; S300: Perform a casting operation on the molten aluminum alloy to obtain an aluminum alloy ingot; S400: Extrusion molding of aluminum alloy ingots to obtain rod-shaped aluminum material for the lens barrel of automotive lenses.

[0030] In one embodiment, pure aluminum ingots and additives are alloyed and smelted under magnetic stirring conditions. Further, the magnetic stirring speed is 800 r / min ~ 1500 r / min.

[0031] In one embodiment, the alloying and smelting operation of pure aluminum ingots and additives includes the following steps: S210. 50% of Sc, P, and Ti are added to a pure aluminum ingot for a first-stage melting treatment to obtain a pre-melted body. Further, the temperature is 750℃~760℃. Further, the time is 15min~25min. It can be understood that this promotes the preferential formation of a nanoscale Al-Sc composite phase in Al within the Sc, while P combines with Fe, which participates in the melting as an impurity in the pure aluminum ingot, to form an Al-P phase, reducing the hindrance of Fe to Cr diffusion.

[0032] S220. Add B to the premelted body for a second-stage melting treatment. Further, the temperature is 720℃~750℃. Further, the time is 10min~20min. It can be understood that this promotes the formation of a Ti-B composite phase by B and Ti, which, together with the Al-Sc composite phase, acts as a heterogeneous nucleation core, thereby refining the grain size.

[0033] S230. The remaining 50% of Sc and Yb are sequentially added to the melt after the second-stage melting treatment for a third-stage melting treatment. Further, the temperature is 680℃~720℃. Further, the time is 10min~20min. This can be understood as achieving the formation of high-density Sc-Al composite phases and Yb-Al composite phases.

[0034] S240. Add the remaining additives to the premelted body after the third-stage melting treatment and perform a fourth-stage melting treatment. Further, the temperature is 750℃~780℃. Further, the time is 15min~25min. It can be understood that the Sc-Al composite phase and the Yb-Al composite phase together act as heterogeneous nucleation cores, promoting the formation of a coherent interface between the heterogeneous nucleation cores and Cr atoms. This ensures that Cr is fully and effectively coherently adsorbed onto the heterogeneous nucleation cores, and achieves a clear coherent interface, effectively hindering further segregation of Cr and improving the uniformity and dispersion stability of Cr.

[0035] It is understandable that by controlling the timing and order of adding substances such as Sc, Yb, P and B during the smelting of aluminum for the lens barrel of the vehicle lens, the uniform dispersion and dispersion stability of Cr are effectively achieved, that is, the grain coarsening caused by Cr segregation is reduced.

[0036] In one embodiment, the aluminum alloy melt is cast into an ingot under ultrasonic vibration conditions. Further, the ultrasonic power is 1200~2100W, and the ultrasonic frequency is 16 kHz~20 kHz.

[0037] In one embodiment, the aluminum alloy molten material is cast into an ingot, and the specific steps are as follows: the ingot mold is preheated to a temperature of 200℃~210℃; then, the temperature of the aluminum alloy molten material is controlled at 700℃~710℃, and it is poured into the ingot mold at a casting speed of 50mm / min, followed by water cooling. Further, the water flow rate is 1.5L / min~2.5L / min.

[0038] In one embodiment, the aluminum alloy ingot is subjected to an extrusion molding operation, and the specific operation steps are as follows: the aluminum alloy ingot is heated to 450°C~455°C at room temperature, then held at that temperature for 1.8h~2.5h, then heated to 480°C~485°C for extrusion, and the extrusion outlet temperature is maintained at 550°C~580°C; then, the aluminum material for the lens barrel of the automotive lens extruded from the extrusion outlet is cooled.

[0039] It is understandable that although the smelting and casting operations effectively prevent further segregation of Cr and improve the uniformity and stability of Cr dispersion, the high Cr content still makes it relatively easy to affect the distribution of Cr in subsequent processes, such as extrusion. Consequently, it is still relatively easy to generate discolored oxide spots during anodizing. In other words, even if we only focus on controlling Cr grain refinement and reducing segregation, it is difficult to further effectively reduce the formation of discolored oxide spots due to the high Cr content and the complex mechanism of composite phase formation. Therefore, in this application, in order to further effectively reduce the formation of discolored oxide spots due to the high Cr content, the aluminum material for the lens barrel of the automotive lens extruded from the extrusion port is further subjected to cooling treatment, including the following steps: Under a cooling rate of 10℃ / s~15℃ / s, the aluminum material for the lens barrel of the automotive lens, extruded from the extruder, undergoes a primary cooling treatment, cooling it to a surface temperature of 350℃~360℃. It can be understood that rapid cooling of the aluminum material for the lens barrel, extruded from the extruder, ensures rapid locking of Cr on the outer surface of the aluminum material, reduces segregation, and better ensures the stability of the Cr content on the outer surface of the aluminum material for the lens barrel.

[0040] Furthermore, under a cooling rate of 3℃ / s to 5℃ / s, the aluminum material used for the lens barrel of the automotive lens, after the first-stage cooling treatment, undergoes a second-stage cooling treatment, cooling it to a surface temperature of 200℃ to 210℃. It can be understood that by rapidly cooling the outer surface of the aluminum material used for the lens barrel, slowing down the cooling rate increases the segregation of Cr from the outer surface towards the interior, thereby gradually increasing the Cr content from the outer surface towards the interior of the aluminum material.

[0041] Furthermore, under natural cooling conditions, the aluminum material used for the lens barrel of the vehicle-mounted lens is subjected to a third-stage cooling treatment after the second-stage cooling treatment, until the temperature of the aluminum material used for the lens barrel of the vehicle-mounted lens is room temperature. It is understandable that by slowing down the cooling rate of the aluminum material used in the lens barrel of the automotive lens, and further slowing down the cooling rate of the aluminum material used in the lens barrel of the automotive lens, the segregation of Cr on the outer surface of the aluminum material pointing inward is further increased, so as to reduce the segregation of Cr at the center of the inner surface of the aluminum material used in the lens barrel of the automotive lens. In this way, the Cr content on the outer surface of the aluminum material used in the lens barrel of the automotive lens first increases and then decreases in the direction pointing inward after the aluminum material is CNC machined to form the lens barrel of the automotive lens. Even after most of the inner center of the aluminum material is removed, the Cr content on the outer surface of the lens barrel first increases and then decreases in the direction pointing inward, so that the Cr content on the inner surface of the lens barrel of the automotive lens is less than the Cr content on the outer surface and less than the Cr content at the center of the inner surface. This effectively improves the optical performance of the lens barrel of the automotive lens while ensuring the mechanical properties and corrosion resistance.

[0042] It is understandable that, based on the fact that the solubility of Cr coherently adsorbed on the Al-Sc composite phase to form composite phase particles in the solid phase is higher than that in the liquid phase, by adjusting the cooling gradient of the aluminum material used for the lens barrel of the extruded rod-shaped automotive lens, the Cr content of the aluminum material used for the lens barrel of the automotive lens first increases and then decreases in the direction from the outer surface to the inner center. This ensures that after the aluminum material used for the lens barrel of the automotive lens is CNC machined to form the lens barrel, and after most of the inner center of the aluminum material is removed, the Cr content of the lens barrel in the direction from the outer surface to the inner surface first increases and then decreases. This results in the Cr content of the inner surface of the lens barrel being less than the Cr content of the outer surface being less than the Cr content of the inner center. This effectively improves the optical performance of the lens barrel of the automotive lens while ensuring the mechanical properties and corrosion resistance of the lens barrel.

[0043] It can also be understood that the Cr content in the lens barrel of the automotive lens first increases and then decreases in the direction from the outer surface to the inner surface, so that the Cr content on the inner surface of the lens barrel is less than the Cr content on the outer surface, which is less than the Cr content in the inner center. This allows for improved mechanical properties and corrosion resistance of the lens barrel while reducing the amount of Cr used, thus reducing the difficulty of controlling Cr segregation during smelting and other operations, and further reducing discolored oxide spots. In one embodiment, the aluminum material used for the lens barrel of the automotive lens includes at least the following components in percentage: Additives: 0.25%~0.3% Cr; 0.05%~0.07% Sc; 0.02%~0.03% Yb; 0.015%~0.03% P; 0.003%~0.008% B; Main component: Balance Al. The aluminum material used for the lens barrel of the automotive lens contains at least 95% Al. Furthermore, the Cr content in the inner center of the lens barrel of the prepared vehicle lens can reach at least 0.3% to 0.35%.

[0044] In one embodiment, after the extrusion molding operation of the aluminum alloy ingot, the processing method for the aluminum material used in the lens barrel of the automotive lens further includes the following step: S500, heat treating the aluminum material used in the lens barrel of the automotive lens. Further, the heat treatment of the aluminum material used in the lens barrel of the automotive lens includes the following steps: S510. The aluminum material used for the lens barrel of the automotive lens is subjected to solution treatment. Further, the temperature is 520℃~540℃. Further, the time is 8h~12h. Further, after the holding time is met, it is quenched and cooled. Further, the cooling rate is 80℃~90℃.

[0045] S520. Low-temperature nucleation treatment of aluminum for the lens barrel of an automotive lens after solution treatment. Further, the temperature is raised to 80℃~85℃. Further, the holding time is 1h~1.5h. Further, the temperature is raised from room temperature to 80℃~85℃. Further, the heating rate is 5℃ / min~6℃ / min. It can be understood that this promotes the preferential and sufficient formation of the Al-Sc composite phase and the Al-Yb composite phase, providing a uniformly dispersed nucleus structure and providing heterogeneous nucleation sites for Cr.

[0046] S530. The aluminum material used for the lens barrel of the automotive lens after low-temperature nucleation treatment is subjected to intermediate-temperature co-deposition treatment. Further, the temperature is raised to 120℃~125℃. Further, the holding time is 2h~2.2h. Further, the temperature of the low-temperature nucleation treatment is raised to the temperature of the intermediate-temperature co-deposition treatment. Further, the heating rate is 3℃ / min~4℃ / min. It can be understood that this promotes the formation of a coherent interface between the Al-Sc composite phase and Cr atoms, thus ensuring that Cr is effectively coherently adsorbed onto the core structure of the Al-Sc composite phase, and achieving a clear coherent interface, effectively hindering further migration of Cr.

[0047] S540. The aluminum material used for the lens barrel of the automotive lens after intermediate-temperature co-deposition treatment is subjected to high-temperature stabilization treatment. Further, the temperature is raised to 160℃~165℃. Further, the holding time is 1h~1.5h. Further, the temperature of the intermediate-temperature co-deposition treatment is raised to the temperature of the high-temperature stabilization treatment. Further, the heating rate is 5℃ / min~6℃ / min. This can be understood as promoting the further and more complete adsorption of Cr into the core structure of the Al-Sc composite phase, and at this time, the diffusion rate of Cr is low, which will not cause coarsening or loss of coherent correlation.

[0048] It is understandable that the aluminum material used in the lens barrel of the aforementioned automotive lens, after undergoing low-temperature nucleation treatment, combined with the control of Cr content during extrusion to achieve gradient distribution, medium-temperature co-deposition treatment, and high-temperature stabilization treatment, effectively and gradually forms a coherent Al-Sc-Cr composite phase with smaller grains. This stabilizes the gradient distribution of Cr content during extrusion, reduces further segregation and aggregation of Cr, ensures the corrosion resistance and mechanical properties of the aluminum material used in the lens barrel, and effectively reduces the decrease in Cr content on the inner and outer surfaces of the aluminum material used in the lens barrel, thereby effectively reducing discolored oxide spots.

[0049] It is also understandable that if the Cr grains are not refined and uniformly and stably dispersed during the smelting operation, the segregation control during subsequent extrusion cannot achieve the stepwise change of Cr, and discolored oxide spots will still be formed due to the coarsening of Cr grains. Even if the stepwise and stable dispersion of Cr is achieved during smelting and extrusion, if the grain refinement and strengthening stability of Cr in the aluminum material used for the lens barrel of the automotive lens cannot be ensured during heat treatment, the gradient uniform distribution of Cr in the lens barrel of the automotive lens cannot be achieved.

[0050] In one embodiment, after the step of performing high-temperature stabilization treatment on the aluminum material for the lens barrel of the vehicle-mounted lens after the intermediate temperature co-deposition treatment, the following step is further included: S550, the aluminum material for the lens barrel of the vehicle-mounted lens is cooled to room temperature in the furnace.

[0051] It should be noted that the processing method for the aluminum material used in the lens barrel of the automotive lens involves more than just the steps mentioned in this application. This application only describes the main steps; the remaining steps are routine and necessary, and therefore will not be elaborated upon. For example, after the step of casting the aluminum alloy melt into an ingot, a homogenization annealing step is also included. Similarly, after the step of adding the remaining additives to the pre-melted material after the third-stage melting process for a fourth-stage melting process, a refining and degassing step is also included. Furthermore, after water cooling in the ingot casting process, a solidification and demolding step is also included.

[0052] This application also provides a lens barrel for a vehicle-mounted lens, which is processed using the aluminum material processing method for the lens barrel of a vehicle-mounted lens of any of the above embodiments.

[0053] In one embodiment, the Cr content of the lens barrel gradually increases and then gradually decreases in the direction from the outer surface to the inner surface of the lens barrel. Furthermore, in the lens barrel of the vehicle-mounted lens, the Cr content on the inner surface is less than the Cr content on the outer surface, which is less than the Cr content at the inner center.

[0054] Compared with the prior art, the present invention has at least the following advantages: The aluminum material used for the lens barrel of the vehicle-mounted lens of the present invention has a Cr content of 0.3%~0.35%, which effectively ensures the corrosion resistance of the aluminum material used for the lens barrel of the vehicle-mounted lens, especially suitable for humid environments. In addition, 0.05%~0.07% Sc, 0.02%~0.03% Yb and 0.003%~0.008% B are added, which preferentially form a composite phase in Al as a heterogeneous nucleation core. Combined with 0.3%~0.35% Cr, it promotes the formation of a coherent interface between the heterogeneous nucleation core and Cr atoms, so that Cr is fully and effectively coherently adsorbed on the heterogeneous nucleation core, and the formed coherent interface is clear. This effectively prevents Cr segregation and the resulting coarsening and uneven distribution of Cr grains, and improves the uniformity and dispersion stability of Cr.

[0055] The embodiments of this application will be described in detail below with reference to examples. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of this application. For experimental methods in the following embodiments where specific conditions are not specified, please refer to the guidelines given in this application, or follow experimental manuals or conventional conditions in the art, or follow the conditions recommended by the manufacturer, or refer to experimental methods known in the art.

[0056] In the specific embodiments described below, the measurement parameters involving raw material components may have slight deviations within the weighing accuracy range unless otherwise specified. Temperature and time parameters are subject to acceptable deviations due to instrument testing accuracy or operational precision.

[0057] It should be understood that in the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0058] Example 1 Formula: Cr 0.3%; Sc 0.05%; Yb 0.02%; P 0.015%; B 0.003%; Fe ≤ 0.18%; Si 0.4%; Mn 0.1%; Ti 0.02%; Mg 0.8%; Cu 0.15%; Zn 0.05%; Al balance; other unspecified elements are considered unavoidable impurities, with a total content of less than 0.15% and a single element content of ≤ 0.05%.

[0059] Example 2 Formula: Cr 0.32%; Sc 0.06%; Yb 0.025%; P 0.022%; B 0.006%; Fe ≤ 0.18%; Si 0.45%; Mn 0.12%; Ti 0.03%; Mg 1.0%; Cu 0.3%; Zn 0.15%; Al balance; other unspecified elements are considered unavoidable impurities, with a total content of less than 0.15% and a single element content of ≤ 0.05%.

[0060] Example 3 Formula: Cr 0.35%; Sc 0.07%; Yb 0.03%; P 0.03%; B 0.008%; Fe ≤ 0.18%; Si 0.5%; Mn 0.15%; Ti 0.05%; Mg 1.2%; Cu 0.40%; Zn 0.25%; Al balance; other unspecified elements are considered unavoidable impurities, with a total content of less than 0.15% and a single element content of ≤ 0.05%.

[0061] Example 4 Formula: Cr 0.25%; Sc 0.06%; Yb 0.025%; P 0.022%; B 0.006%; Fe ≤ 0.18%; Si 0.45%; Mn 0.12%; Ti 0.03%; Mg 1.0%; Cu 0.3%; Zn 0.15%; Al balance; other unspecified elements are considered unavoidable impurities, with a total content of less than 0.15% and a single element content of ≤ 0.05%.

[0062] Example 5 Formula: Cr 0.3%; Sc 0.06%; Yb 0.025%; P 0.022%; B 0.006%; Fe ≤ 0.18%; Si 0.45%; Mn 0.12%; Ti 0.03%; Mg 1.0%; Cu 0.3%; Zn 0.15%; Al balance; other unspecified elements are considered unavoidable impurities, with a total content of less than 0.15% and a single element content of ≤ 0.05%.

[0063] Example 6 The formulations in Examples 1 to 3 were used to obtain the lens barrel for automotive lenses using the following method: With a magnetic stirring speed of 2000 r / min, 50% of Sc, P, and Ti were added to a pure aluminum ingot for smelting at 750°C for 25 min. Then, B was added and smelting continued at 720°C for 20 min. Next, the remaining 50% of Sc and Yb were added sequentially and smelting continued at 680°C for 20 min. Finally, the remaining material was added and smelting continued at 750°C for 25 min. With an ultrasonic power of 2100W and an ultrasonic frequency of 20kHz, the ingot mold was preheated to a temperature of 200℃. Then, the temperature of the aluminum alloy melt was controlled at 700℃ and poured into the ingot mold at a casting speed of 50mm / min. After pouring, the ingot was cooled with water at a flow rate of 1.5L / min. The aluminum alloy ingot is heated to 450°C at room temperature, then held at that temperature for 2.5 hours, and then heated to 480°C for extrusion, while maintaining the extrusion outlet temperature at 550°C. The extruded aluminum material is then cooled to room temperature at a cooling rate of 10°C / s to obtain an aluminum rod. The cooled aluminum material was treated in a furnace at 520℃ for 8 hours to complete the solution treatment. Then, the aluminum material was placed in the furnace and the furnace temperature was raised to 80℃ at a rate of 5℃ / min and held for 1.5 hours. Then, the furnace temperature was raised to 120℃ at a rate of 3℃ / min and held for 2.2 hours. Then, the furnace temperature was raised to 160℃ at a rate of 5℃ / min and held for 1.5 hours. Finally, the aluminum material was cooled to room temperature in the furnace. The lens barrel is then obtained through CNC machining and finishing, and then anodized.

[0064] Example 7 The formulations in Examples 1 to 3 were used to obtain the lens barrel for automotive lenses using the following method: With magnetic stirring at 1800 r / min, 50% of Sc, P, and Ti were added to a pure aluminum ingot and smelted at 755°C for 20 min. Then, B was added and smelting continued at 7350°C for 15 min. The remaining 50% of Sc and Yb were then added and smelted at 700°C for 15 min. Finally, the remaining material was added and smelted at 765°C for 20 min. The ingot mold was preheated to 205°C with an ultrasonic power of 1800W and an ultrasonic frequency of 18kHz. Then, the temperature of the aluminum alloy melt was controlled at 705°C and poured into the ingot mold at a casting speed of 50mm / min. After pouring, the ingot was cooled with water at a flow rate of 2.0L / min. The aluminum alloy ingot was heated to 452°C at room temperature and held for 2.3 hours. Then it was heated to 482°C for extrusion, and the extrusion outlet temperature was kept at 570°C. The extruded aluminum material was cooled to room temperature at a cooling rate of 12°C / s to obtain an aluminum rod. The cooled aluminum material was treated in a furnace at 530℃ for 10 hours to complete the solution treatment. Then, the aluminum material was placed in the furnace and the furnace temperature was raised to 82℃ at a rate of 5.5℃ / min and held for 1.2 hours. Then, the furnace temperature was raised to 122℃ at a rate of 3℃ / min and held for 2.1 hours. Then, the furnace temperature was raised to 162℃ at a rate of 5℃ / min and held for 1.3 hours. Finally, the aluminum material was cooled to room temperature in the furnace. The lens barrel is then obtained through CNC machining and finishing, and then anodized.

[0065] Example 8 The formulations in Examples 1 to 3 were used to obtain the lens barrel for automotive lenses using the following method: With a magnetic stirring speed of 2000 r / min, 50% of Sc, P and Ti were added to a pure aluminum ingot for smelting at 760℃ for 15 min. Then, B was added and smelting continued at 750℃ for 10 min. The remaining 50% of Sc and Yb were then added and smelting continued at 720℃ for 10 min. Finally, the remaining material was added and smelting continued at 780℃ for 15 min. With an ultrasonic power of 1500W and an ultrasonic frequency of 16kHz, the ingot mold was preheated to a temperature of 210℃. Then, the temperature of the aluminum alloy melt was controlled at 710℃ and poured into the ingot mold at a casting speed of 50mm / min. After pouring, the ingot was cooled with water at a flow rate of 2.5L / min. The aluminum alloy ingot is heated to 455°C at room temperature, then held at that temperature for 1.8 hours, and then heated to 485°C for extrusion, while maintaining the extrusion outlet temperature at 580°C. The extruded aluminum material is then cooled to room temperature at a cooling rate of 15°C / s to obtain an aluminum rod. The cooled aluminum material was treated in a furnace at 540℃ for 8 hours to complete the solution treatment. Then, the aluminum material was placed in the furnace and the furnace temperature was raised to 85℃ at a rate of 6℃ / min and held for 1 hour. Then, the furnace temperature was raised to 125℃ at a rate of 4℃ / min and held for 2 hours. Then, the furnace temperature was raised to 165℃ at a rate of 6℃ / min and held for 1 hour. Finally, the aluminum material was cooled to room temperature in the furnace. The lens barrel is then obtained through CNC machining and finishing, and then anodized.

[0066] Example 9 The formulations in Examples 4 and 5 were used to obtain the lens barrel for automotive lenses using the following method: With magnetic stirring at 1800 r / min, 50% of Sc, P, and Ti were added to a pure aluminum ingot and smelted at 755°C for 20 min. Then, B was added and smelting continued at 7350°C for 15 min. The remaining 50% of Sc and Yb were then added and smelted at 700°C for 15 min. Finally, the remaining material was added and smelted at 765°C for 20 min. The ingot mold was preheated to 205°C with an ultrasonic power of 1800W and an ultrasonic frequency of 18kHz. Then, the temperature of the aluminum alloy melt was controlled at 705°C and poured into the ingot mold at a casting speed of 50mm / min. After pouring, the ingot was cooled with water at a flow rate of 2.0L / min. The aluminum alloy ingot is heated to 452°C at room temperature and held for 2.3 hours. Then, it is heated to 482°C for extrusion, and the extrusion outlet temperature is maintained at 570°C. The aluminum material extruded from the extrusion outlet is cooled to a surface temperature of 360°C at a cooling rate of 10°C / s. Then, the aluminum material is cooled to a surface temperature of 210°C at a cooling rate of 3°C / s. Finally, it is cooled to room temperature to obtain a rod-shaped aluminum material. The cooled aluminum material was treated in a furnace at 530℃ for 10 hours to complete the solution treatment. Then, the aluminum material was placed in the furnace and the furnace temperature was raised to 82℃ at a rate of 5.5℃ / min and held for 1.2 hours. Then, the furnace temperature was raised to 122℃ at a rate of 3℃ / min and held for 2.1 hours. Then, the furnace temperature was raised to 162℃ at a rate of 5℃ / min and held for 1.3 hours. Finally, the aluminum material was cooled to room temperature in the furnace. The lens barrel is then obtained through CNC machining and finishing, and then anodized.

[0067] Example 10 The formulations in Examples 4 and 5 were used to obtain the lens barrel for automotive lenses using the following method: With magnetic stirring at 1800 r / min, 50% of Sc, P, and Ti were added to a pure aluminum ingot and smelted at 755°C for 20 min. Then, B was added and smelting continued at 7350°C for 15 min. The remaining 50% of Sc and Yb were then added and smelted at 700°C for 15 min. Finally, the remaining material was added and smelted at 765°C for 20 min. The ingot mold was preheated to 205°C with an ultrasonic power of 1800W and an ultrasonic frequency of 18kHz. Then, the temperature of the aluminum alloy melt was controlled at 705°C and poured into the ingot mold at a casting speed of 50mm / min. After pouring, the ingot was cooled with water at a flow rate of 2.0L / min. The aluminum alloy ingot is heated to 452°C at room temperature and held for 2.3 hours. Then, it is heated to 482°C for extrusion, and the extrusion outlet temperature is maintained at 570°C. The aluminum material extruded from the extrusion outlet is cooled to a surface temperature of 355°C at a cooling rate of 10°C / s. Then, the aluminum material is cooled to a surface temperature of 210°C at a cooling rate of 5°C / s. Finally, it is cooled to room temperature to obtain a rod-shaped aluminum material. The cooled aluminum material was treated in a furnace at 530℃ for 10 hours to complete the solution treatment. Then, the aluminum material was placed in the furnace and the furnace temperature was raised to 82℃ at a rate of 5.5℃ / min and held for 1.2 hours. Then, the furnace temperature was raised to 122℃ at a rate of 3℃ / min and held for 2.1 hours. Then, the furnace temperature was raised to 162℃ at a rate of 5℃ / min and held for 1.3 hours. Finally, the aluminum material was cooled to room temperature in the furnace. The lens barrel is then obtained through CNC machining and finishing, and then anodized.

[0068] Example 11 The formulations in Examples 4 and 5 were used to obtain the lens barrel for automotive lenses using the following method: With magnetic stirring at 1800 r / min, 50% of Sc, P, and Ti were added to a pure aluminum ingot and smelted at 755°C for 20 min. Then, B was added and smelting continued at 7350°C for 15 min. The remaining 50% of Sc and Yb were then added and smelted at 700°C for 15 min. Finally, the remaining material was added and smelted at 765°C for 20 min. The ingot mold was preheated to 205°C with an ultrasonic power of 1800W and an ultrasonic frequency of 18kHz. Then, the temperature of the aluminum alloy melt was controlled at 705°C and poured into the ingot mold at a casting speed of 50mm / min. After pouring, the ingot was cooled with water at a flow rate of 2.0L / min. The aluminum alloy ingot is heated to 452°C at room temperature and held for 2.3 hours. Then, it is heated to 482°C for extrusion, and the extrusion outlet temperature is maintained at 570°C. The aluminum material extruded from the extrusion outlet is cooled to a surface temperature of 350°C at a cooling rate of 12°C / s. Then, the aluminum material is cooled to a surface temperature of 200°C at a cooling rate of 5°C / s. Finally, it is cooled to room temperature to obtain a rod-shaped aluminum material. The cooled aluminum material was treated in a furnace at 530℃ for 10 hours to complete the solution treatment. Then, the aluminum material was placed in the furnace and the furnace temperature was raised to 82℃ at a rate of 5.5℃ / min and held for 1.2 hours. Then, the furnace temperature was raised to 122℃ at a rate of 3℃ / min and held for 2.1 hours. Then, the furnace temperature was raised to 162℃ at a rate of 5℃ / min and held for 1.3 hours. Finally, the aluminum material was cooled to room temperature in the furnace. The lens barrel is then obtained through CNC machining and finishing, and then anodized.

[0069] Example 12 The formulations in Examples 4 and 5 were used to obtain the lens barrel for automotive lenses using the following method: With magnetic stirring at 1800 r / min, 50% of Sc, P, and Ti were added to a pure aluminum ingot and smelted at 755°C for 20 min. Then, B was added and smelting continued at 7350°C for 15 min. The remaining 50% of Sc and Yb were then added and smelted at 700°C for 15 min. Finally, the remaining material was added and smelted at 765°C for 20 min. The ingot mold was preheated to 205°C with an ultrasonic power of 1800W and an ultrasonic frequency of 18kHz. Then, the temperature of the aluminum alloy melt was controlled at 705°C and poured into the ingot mold at a casting speed of 50mm / min. After pouring, the ingot was cooled with water at a flow rate of 2.0L / min. The aluminum alloy ingot is heated to 452°C at room temperature and held for 2.3 hours. Then, it is heated to 482°C for extrusion, and the extrusion outlet temperature is maintained at 570°C. The aluminum material extruded from the extrusion outlet is cooled to a surface temperature of 350°C at a cooling rate of 15°C / s. Then, the aluminum material is cooled to a surface temperature of 200°C at a cooling rate of 6°C / s. Finally, it is cooled to room temperature to obtain a rod-shaped aluminum material. The cooled aluminum material was treated in a furnace at 530℃ for 10 hours to complete the solution treatment. Then, the aluminum material was placed in the furnace and the furnace temperature was raised to 82℃ at a rate of 5.5℃ / min and held for 1.2 hours. Then, the furnace temperature was raised to 122℃ at a rate of 3℃ / min and held for 2.1 hours. Then, the furnace temperature was raised to 162℃ at a rate of 5℃ / min and held for 1.3 hours. Finally, the aluminum material was cooled to room temperature in the furnace. The lens barrel is then obtained through CNC machining and finishing, and then anodized.

[0070] In the microscope tubes obtained in Examples 6 and 7, the heterochromatic oxide spots visible under a metallurgical microscope (500x magnification) were all: tiny spots with a diameter ≤0.1mm were present, but per 100cm 2 ≤2; grain size is less than 25μm; tensile strength is greater than 500MPa; yield strength is greater than 380MPa; elongation is greater than 9%; the deepest intergranular corrosion pit is only 40.25μm, and the exfoliation corrosion weight loss rate is 0.20% at this time.

[0071] In the microscope tubes obtained in Examples 8 to 12, the following characteristics of discolored oxide spots were observed under a metallographic microscope (500x magnification): no discolored spots, uniform color; grain size was less than 22 μm; tensile strength was greater than 490 MPa; yield strength was greater than 375 MPa; elongation was greater than 8.7%; elongation was greater than 9%; the deepest intergranular corrosion pit was only 45.63 μm, and the weight loss rate of exfoliation corrosion was 0.22%. The overall effect was best in the microscope tube obtained in Example 10.

[0072] The testing method is as follows: Grain size: The aluminum alloy was subjected to low-magnification testing and analysis according to the method of GB / T3264-2000; Tensile strength: A 6 mm diameter sample was prepared according to GB / T16865-2023, and then tested according to the test method in GB / T228.1-2021; Yield strength: Prepare a 6 mm diameter specimen according to GB / T16865-2023, and then test it according to the test method in GB / T228.1-2021; Elongation: Prepare a 6 mm diameter specimen according to GB / T16865-2023, and then test it according to the test method in GB / T228.1-2021; Intergranular corrosion performance: Tested according to the "GBT7998 Standard for Intergranular Corrosion of Aluminum Alloys"; Exfoliation corrosion performance: Tested according to GB / T 22639 Test method for exfoliation corrosion of aluminum alloy processed products; Cyclic corrosion performance was tested according to DIN EN ISO 11997-1 Cycle B standard.

[0073] The above embodiments merely illustrate several implementation methods of this application to facilitate a detailed understanding of the technical solutions of this application, but should not be construed as limiting the scope of protection of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Furthermore, it should be understood that after reading the above teachings of this application, those skilled in the art can make various alterations or modifications to this application, and the equivalent forms obtained also fall within the scope of protection of this application. It should also be understood that technical solutions obtained by those skilled in the art based on the technical solutions provided in this application through logical analysis, reasoning, or limited experimentation are all within the scope of protection of the appended claims. Therefore, the scope of protection of this patent application should be determined by the content of the appended claims, and the specification can be used to interpret the content of the claims.

Claims

1. An aluminum material for the lens barrel of a vehicle-mounted lens, characterized in that, It should include at least the following components in percentage form: additive: Cr 0.3%~0.35%； Sc 0.05%~0.07%; Yb 0.02%~0.03%; P 0.015%~0.03%； B 0.003%~0.008%； Principal components: Al balance; The aluminum material used for the lens barrel of the vehicle-mounted lens contains at least 95% Al.

2. The aluminum material for the lens barrel of the vehicle-mounted lens according to claim 1, characterized in that, The additive also includes the following components in percentage: Fe ≤0.18%; Si 0.4%~0.5%.

3. The aluminum material for the lens barrel of the vehicle-mounted lens according to claim 1, characterized in that, The additive also includes at least a portion of each of the following components in percentage amounts: Mn 0.1%~0.15%; Ti 0.02%~0.05%; Mg 0.8%~1.2%; Cu 0.15%~0.40%; Zn 0.05%~0.25%.

4. The aluminum material for the lens barrel of the vehicle-mounted lens according to any one of claims 1 to 3, characterized in that, The aluminum material used for the lens barrel of the vehicle-mounted lens also contains impurities, the impurity content is ≤0.15%, and the content of a single substance in the impurities is ≤0.05%.

5. A method for processing aluminum material for the lens barrel of a vehicle-mounted lens, used to process aluminum material for the lens barrel of a vehicle-mounted lens according to any one of claims 1 to 4, characterized in that, The processing method for the aluminum material used in the lens barrel of the vehicle-mounted lens includes the following steps: To obtain pure aluminum ingots and additives; The pure aluminum ingot and additives are subjected to an alloying smelting operation to obtain an aluminum alloy melt. The aluminum alloy melt is subjected to a casting operation to obtain an aluminum alloy ingot; The aluminum alloy ingot is extruded to obtain a rod-shaped aluminum material for the lens barrel of an automotive lens.

6. The method for processing aluminum material for the lens barrel of a vehicle-mounted lens according to claim 5, characterized in that, The pure aluminum ingot and additives are alloyed and smelted under magnetic stirring conditions.

7. The method for processing aluminum material for the lens barrel of a vehicle-mounted lens according to claim 5, characterized in that, The alloying and smelting operation of the pure aluminum ingot and additives includes the following steps: 50% of Sc, P and Ti are added to the pure aluminum ingot for a first-stage smelting process to obtain a pre-melted body; B and Si are added sequentially to the premelted body for a second-stage melting process; The remaining 50% of Sc and Yb are sequentially added to the melt after the second-stage melting process for a third-stage melting process. The remaining additives are added to the premelted body after the third-stage melting process for a fourth-stage melting process.

8. The method for processing aluminum material for the lens barrel of a vehicle-mounted lens according to claim 5, characterized in that, The aluminum alloy melt is cast into an ingot under ultrasonic vibration conditions.

9. The method for processing aluminum material for the lens barrel of a vehicle-mounted lens according to claim 5, characterized in that, Following the extrusion molding operation of the aluminum alloy ingot, the processing method for the aluminum material used in the lens barrel of the automotive lens further includes the following steps: The aluminum material used for the lens barrel of the vehicle-mounted lens is heat-treated.

10. A lens barrel for a vehicle-mounted lens, characterized in that, The aluminum material for the lens barrel of the vehicle-mounted lens is processed using the processing method for the aluminum material for the lens barrel of the vehicle-mounted lens as described in any one of claims 5 to 9.