CN114959520A - Aluminum alloy covering piece and preparation method thereof - Google Patents
Aluminum alloy covering piece and preparation method thereof Download PDFInfo
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- CN114959520A CN114959520A CN202210518547.5A CN202210518547A CN114959520A CN 114959520 A CN114959520 A CN 114959520A CN 202210518547 A CN202210518547 A CN 202210518547A CN 114959520 A CN114959520 A CN 114959520A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
Abstract
The invention discloses an aluminum alloy covering piece and a preparation method thereof. A preparation method of an aluminum alloy covering part comprises the following steps: s1, quenching an aluminum alloy plate strip after solution treatment; s2, straightening the aluminum alloy plate strip processed in the step S1, and then forming to obtain a covering piece blank; s3, carrying out aging treatment on the covering piece blank; the time interval between the solution treatment and the quenching is 1-8 s; the time interval between the quenching and the forming treatment is less than or equal to 48 hours; the invention can obtain the covering part with high strength and deep drawing structure through the adjustment of the sequence of the steps and the design of the time interval between the steps. The invention also provides a covering piece prepared by the preparation method.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy processing, and particularly relates to an aluminum alloy covering piece and a preparation method thereof.
Background
The covering element is a protective shell of various products, such as automobile covering elements, notebook computer shells, mobile phone shells, air conditioner shells, travel cases and the like, the basic requirements of the products are high strength, high rigidity, light weight and beautiful appearance, and in addition, the raw materials for preparing the covering element are required to have the deep drawing capability (forming property).
In order to meet the forming performance of the high-strength aluminum alloy, the aluminum alloy needs to be subjected to solution treatment and quenching, and the peak elongation of the aluminum alloy after the solution treatment can reach 20-40%. In order to meet the requirement of high strength, the covering parts are mostly 2 series aluminum alloy, 6 series aluminum alloy and 7 series aluminum alloy, such as 7075, 7055, 2A12 and the like, the aluminum alloy needs to be subjected to aging treatment, and the strength of the treated material can reach 400-700 MPa. However, the aluminum alloy after solution treatment and quenching has a low strength and a high elongation, and the formability is lowered (usually, the elongation is less than 10%) although the strength is increased after the subsequent aging treatment. Further, since the retention time of the formability of the material after the solution treatment or quenching is short, the formability is largely reduced or even lost by the action of natural aging or artificial aging, and it is difficult to grasp the formability in production. Therefore, in the traditional production process, a material factory usually adopts a method of firstly carrying out solution treatment and then aging to prepare the aluminum alloy, and then the aluminum alloy is delivered to product enterprises for operations such as forming and the like; however, the high-strength aluminum alloy prepared by the method has poor formability.
In summary, it is very important to develop a method for preparing a high-strength aluminum alloy capable of being deep-drawn.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art described above. Therefore, the invention provides a preparation method of an aluminum alloy covering part, which can obtain a covering part with a high-strength and deep-drawing structure through the adjustment of the sequence of steps and the design of time intervals among the steps.
The invention also provides a covering piece prepared by the preparation method.
According to one aspect of the invention, a method for preparing an aluminium alloy covering part is provided, which comprises the following steps:
s1, quenching an aluminum alloy plate strip after solution treatment;
s2, straightening the aluminum alloy plate strip processed in the step S1, and then forming to obtain a covering piece blank;
s3, carrying out aging treatment on the covering piece blank;
the time interval between the solution treatment and the quenching is 1-8 s;
the time interval between the quenching and the forming treatment is less than or equal to 48 hours;
according to a preferred embodiment of the present invention, at least the following advantages are provided:
in the traditional process, the solution treatment can improve the forming performance (elongation) of the aluminum alloy, the aging can improve the high strength of the aluminum alloy, and the solution treatment and the aging cannot be carried out simultaneously, so that the strength and the forming performance of the aluminum alloy cannot reach peak values simultaneously;
the aluminum alloy for preparing the aluminum alloy covering part generally needs high forming performance (deep drawing performance) and high strength, wherein the forming performance generally requires that the elongation is more than or equal to 25 percent so as to meet the deformation effect that the ratio of the diameter after stretching to the diameter before stretching is about 0.5; therefore, high strength aluminum alloy cladding (deep drawn parts) are often difficult to produce successfully;
the research of the invention finds that the 2 series, 6 series and 7 series aluminum alloy plate strips have 20-40% of elongation within 48 hours after the solution treatment and the quenching treatment are sequentially carried out, and the elongation is rapidly reduced after the elongation exceeds 48 hours;
according to the above studies, the forming step is set between quenching and aging; a molding step for allowing the coating material to have a high elongation after the solution treatment; the strength of the obtained covering part is improved in the aging process; a high-strength covering having a deep-drawn structure can be obtained.
In some embodiments of the present invention, the preparation method further includes, before step S1, the steps of ingot production, homogenization annealing, hot rolling, cold rolling, and splitting, which are performed sequentially.
In some embodiments of the invention, the cold rolling process further comprises an annealing process.
In some embodiments of the invention, the slitting process comprises edge cutting and slitting (dividing a wide aluminum alloy sheet strip into a plurality of narrow aluminum alloy sheet strips without cutting in the length direction).
In some embodiments of the present invention, in the step S1, the aluminum alloy plate strip has a thickness of 0.5 to 3 mm. Therefore, when the aluminum alloy covering piece with specific thickness and size is prepared, the deformation of the aluminum alloy plate strip in the process is moderate and is easier to control.
In some embodiments of the present invention, in step S1, the material of the aluminum alloy strip includes one of a 2-series aluminum alloy, a 6-series aluminum alloy and a 7-series aluminum alloy.
In some preferred embodiments of the present invention, in step S1, the material of the aluminum alloy strip includes one of 7075, 7055, 2195 and 2a12 type aluminum alloys.
The aluminum alloy with the type has higher strength, and the forming performance of the aluminum alloy covering part is only required to be solved aiming at the need of preparing the aluminum alloy covering part, namely the preparation process of the aluminum alloy covering part is simplified and the yield is improved through the selection of materials.
In some embodiments of the present invention, in the step S1, the temperature of the solution treatment is 450 to 550 ℃.
In some preferred embodiments of the present invention, in step S1, the solution treatment temperature is 470 to 500 ℃.
In some further preferred embodiments of the present invention, in step S1, the temperature of the solution treatment is 470 to 495 ℃.
In some embodiments of the present invention, in the step S1, the time period of the solution treatment is 5 to 30 min.
In some preferred embodiments of the present invention, in the step S1, the time period of the solution treatment is 15 to 25 min.
The time length of the solution treatment is in positive correlation with the thickness of the aluminum alloy plate strip.
In some embodiments of the present invention, in step S1, the heating rate of the solution treatment is 3 to 5 min/mm.
The heating rate is a temperature at which the aluminum alloy sheet and strip having a thickness of 1mm needs to be heated for 3 to 5 minutes, for example, if one sheet has a thickness of 10mm, 30 to 50 minutes is required for the solution treatment.
In some embodiments of the invention, in step S1, the solution treatment is performed under a protective atmosphere; the protective atmosphere comprises at least one of nitrogen, argon, and other inert gases.
And controlling according to the conditions of the solution treatment, so that the forming performance of the obtained aluminum alloy plate strip is optimal.
In some embodiments of the invention, in the step S1, the aluminum alloy plate strip has a tensile stress of 2 to 15MPa during the quenching. The aluminum alloy plate strip has high formability.
In some preferred embodiments of the present invention, in step S1, the quenching method is double-sided spray cooling.
In some preferred embodiments of the present invention, in step S1, the quenching medium is at least one of water, water mist and strong wind.
In some preferred embodiments of the present invention, when the cooling medium is water, the spraying flow rate of the cooling medium is 20 to 100L/m 2 。
In some preferred embodiments of the present invention, when the cooling medium is water, the thickness of the aluminum alloy plate strip is 1 to 3 mm.
In some preferred embodiments of the present invention, when the cooling medium is water mist, the spraying flow rate of the cooling medium is 5 to 25L/m 2 。
In some preferred embodiments of the present invention, when the cooling medium is water mist, the thickness of the aluminum alloy plate strip is 0.6-1.2 mm.
In some preferred embodiments of the present invention, when the cooling medium is strong wind, the spraying flow rate of the cooling medium is 2-10 m 3 /m 2 。
In some preferred embodiments of the present invention, when the cooling medium is strong wind, the thickness of the aluminum alloy plate strip is 0.5 to 0.75 mm.
And regarding the cooling capacity, water is more than water mist and strong wind is more than strong wind, so that a proper cooling medium is selected according to the thickness of the aluminum alloy plate strip, so that the cooling speed of each part in the aluminum alloy plate strip is more uniform and is more controllable.
In some embodiments of the invention, the time interval between the solution treatment and the quenching is 1 to 3 seconds.
In some embodiments of the invention, the straightening comprises pulling and multi-roll straightening performed sequentially in step S2.
In some embodiments of the invention, the tension stress of the withdrawal is 5 to 50 MPa.
Straightening immediately after the quenching reduces the stress of the quenching.
In some embodiments of the invention, the multi-roll straightening is performed by using a 9-27-roll straightening machine, and the roll diameter of the 9-27-roll straightening machine is 25-62 mm.
The multi-roll straightening is performed after the withdrawal and straightening, and preparation can be made for subsequent processes such as forming and the like.
The straightening and withdrawal are combined with the multi-roll straightening, so that the unification of multi-process forming is realized.
In some embodiments of the invention, in the step S2, the elongation of the aluminum alloy plate strip obtained after straightening is 20-40%.
In some embodiments of the invention, in the step S2, the elongation of the aluminum alloy plate strip obtained after straightening is 25-40%.
In some embodiments of the invention, in step S2, the minimum relative bending radius of the aluminum alloy plate strip obtained after straightening is less than or equal to 0.5.
The relative bend radius is the ratio between the bend radius and the thickness of the sheet strip.
In some embodiments of the invention, in the step S2, the minimum drawing fillet of the aluminum alloy plate strip obtained after straightening is less than or equal to 3 mm.
In some embodiments of the invention, in step S2, the maximum drawing depth of the aluminum alloy plate strip obtained after straightening is more than or equal to 115 mm.
In some embodiments of the present invention, the temperature of the molding process in step S2 is-196 ℃ to 60 ℃.
Through the steps and the adjustment of parameters, the preparation method provided by the invention can enable the aluminum alloy plate strip to obtain good forming performance at normal temperature; in addition, the forming performance of the aluminum alloy plate strip is further improved by virtue of the excellent rheological property of the aluminum alloy plate strip at ultralow temperature.
In some embodiments of the invention, in step S2, the method of forming process includes at least one of bending, stretching, blanking, flanging, reaming, reducing, spinning, and stamping.
In some embodiments of the invention, the time interval between quenching and forming is ≦ 24 h.
In some preferred embodiments of the invention, the time interval between quenching and forming is ≦ 10 h.
In some embodiments of the invention, the time interval between quenching and forming is ≦ 5 h.
In some embodiments of the present invention, in step S2, the surface of the aluminum alloy sheet strip is provided with a protective film during the forming process.
The protective film is not cracked in the forming treatment process, and the aluminum alloy plate strip can be protected from being scratched.
In some embodiments of the invention, the protective film comprises at least one of a polymeric plastic film, a graphite paper, and a lubricating oil film.
In some embodiments of the present invention, the thickness of the protective film is 0.01 to 0.1 mm.
In some embodiments of the invention, the length and width of the protective film are equal to the corresponding dimensions of the aluminium alloy sheet strip.
In some embodiments of the present invention, the material of the lubricating oil film comprises at least one of mineral oil, castor oil, and a graphite powder/oil mixture.
In some embodiments of the invention, the method of disposing the lubricating oil film is spraying or brushing; and the spraying position is the outer surface of the aluminum alloy plate strip.
In some embodiments of the present invention, the protective film is provided on the surface of the aluminum alloy sheet strip in a lubricating process.
In some embodiments of the present invention, the aluminum alloy strip is structurally continuous without cutting, breaking or the like along the long direction in steps S1 to S2.
In some embodiments of the invention, the method of manufacturing further comprises apparent treating the cover blank between the forming treatment and the aging treatment.
In some embodiments of the invention, the appearance treatment comprises an anodic oxidation treatment.
The traditional high-strength aluminum alloy, such as 7 series aluminum alloy and 2 series aluminum alloy, is easy to generate color difference after anodic oxidation, and the wear resistance and corrosion resistance of an oxide film are poor. One key reason for the above problem is that the second phase of copper, after being precipitated, will seriously affect the quality of the oxide film;
the invention carries out apparent treatment (anodic oxidation) before the aging treatment, namely, the surface treatment is still in a solid solution state, and solute atoms mainly exist in a solid solution state and are not precipitated, so the oxidation performance and the quality of an oxidation film are greatly improved.
In some embodiments of the invention, the method of making further comprises apparent treating the aluminum alloy cover after the aging treatment.
That is, the surface treatment in the present invention may be performed before or after the aging.
In some embodiments of the present invention, in the preparation method, steps S1 to S3 are completed on the same production line, so that time control between steps can be realized, and finally, a covering part with excellent mechanical properties and appearance properties can be obtained.
In the preparation process of the traditional deep-drawing covering part, the utilization rate of the raw material aluminum alloy plate strip is only 50-70%, the surplus material is more, and the waste materials such as defective products and the like are difficult to return to a material factory for recycling, so the resource utilization rate is low, and the waste products have great influence on the environment;
the invention puts the steps of solution treatment, forming treatment, aging treatment and the like on the same production line, namely the material production and the forming formation production are on the same production line, the produced newspaper wastes can be immediately reprocessed, the re-transportation and the waste of defective products and excess materials are avoided, the cost is saved, and the influence on the environment is effectively reduced.
According to still another aspect of the present invention, there is provided a cover member, which is produced by the production method.
In some embodiments of the present invention, the thickness of the covering member is 0.5 to 3.0 mm.
In some preferred embodiments of the present invention, the thickness of the covering member is 0.5 to 1.5 mm.
In some embodiments of the invention, the strength of the cover is ≧ 600 MPa.
In some embodiments of the invention, the cover comprises at least one of a notebook computer housing, a cell phone housing, an automobile housing, and a travel case.
Detailed Description
The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive efforts are within the protection scope of the present invention based on the embodiments of the present invention.
Example 1
This embodiment has prepared a covering, specifically is notebook computer shell, and specific process is:
s1, carrying out solution treatment on a 7055 type aluminum alloy plate strip with the thickness of 0.65mm at 475 ℃ for 0.25h, and carrying out quenching treatment by using clear water at 35 ℃; the time interval between the solution treatment and the quenching is 2.5-3 s (the time is short and is difficult to accurately calculate, so that the time can be within the range);
s2, stretching the aluminum alloy plate strip obtained in the step S1 into a covering piece blank after performing withdrawal straightening and multi-roll straightening; the time interval between quenching and forming was 3 hours, and the thickness of the cover blank after forming was 0.625mm (0.025 mm less was removed by polishing);
s3, carrying out aging treatment on the covering piece blank obtained in the step S2, wherein the aging parameter is 125 ℃ multiplied by 16 h.
And (3) carrying out anodic oxidation treatment on the covering part after the aging treatment, wherein the obtained covering part is uniform and bright in appearance and has no flaws.
Example 2
This embodiment has prepared a covering, specifically is car door, and specific process is:
s1, carrying out solution treatment and quenching treatment at 495 ℃ for 0.4h on a 2195 type aluminum alloy plate strip with the thickness of 1.0 mm; the time interval between the solution treatment and the quenching is 3-4 s (the time is short and is difficult to calculate accurately, so that the time can be within the range);
s2, after the aluminum alloy plate strip obtained in the step S1 is subjected to straightening and multi-roll straightening, the aluminum alloy plate strip is stretched into a covering piece blank; the time interval between quenching and forming is 4h, and the thickness of the formed covering part blank is 1.0 mm;
and S3, carrying out aging treatment on the covering piece blank obtained in the step S2.
And (3) carrying out anodic oxidation treatment on the covering part after the aging treatment, wherein the obtained covering part is uniform and bright in appearance and has no flaws.
Example 3
In this embodiment, a covering member, specifically a suitcase, is prepared, and the specific process is as follows:
s1, performing solid solution treatment on a 7055 type aluminum alloy plate strip with the thickness of 0.55mm at 470 ℃ for 0.35h, and quenching with clear water at 35 ℃; the time interval between the solution treatment and the quenching is 1-8 s (the time is short and is difficult to accurately calculate, so that the time can be within the range);
s2, stretching the aluminum alloy plate strip obtained in the step S1 into a covering piece blank after performing pulling straightening and multi-roll straightening; the time interval between quenching and forming is 3 hours; the thickness of the cover blank after forming was 0.52mm (loss thickness for grinding);
s3, carrying out aging treatment on the covering piece blank obtained in the step S2, wherein the aging parameter is 150 ℃ multiplied by 18 h.
And (3) carrying out anodic oxidation treatment on the covering part after the aging treatment, wherein the obtained covering part is uniform and bright in appearance and has no flaws.
Comparative example 1
The comparative example prepared a notebook computer case, which is different from example 1 in that the specific process was:
s1, performing solid solution treatment on a 7055 type aluminum alloy plate strip with the thickness of 0.55mm at 470 ℃ for 0.25h, and quenching with clear water at 35 ℃; the time interval between the solution treatment and the quenching is 2.5s to 3s (since the time is short, it is difficult to calculate accurately, so that the time interval is within the range);
s2, after the aluminum alloy plate strip obtained in the step S1 is subjected to pulling straightening and multi-roll straightening, artificial aging is carried out for 24 hours at 125 ℃ for 16 hours, and the strength after aging is more than 600 Mpa;
and S3, stretching the plate subjected to artificial aging, wherein the round corners are all cracked, and the hems are basically cracked.
Test examples
The test examples tested the performance of the covers and intermediate products prepared in examples 1-3 and comparative example 1. Wherein:
the elongation, minimum relative bend radius, minimum draw radius and draw depth of the aluminum alloy sheet strip before forming (referred to as intermediate product in table 1) in step S2 were tested. Wherein the elongation is determined with reference to GBT228-2002, and other parameters are determined by testing the covering members obtained in examples 1-3 and comparative example 1. The technical parameters are shown in table 1.
The tensile strength and elongation of the coated parts obtained in examples 1 to 3 were also measured with reference to GBT228-2002, and the results are shown in Table 1.
The deformation resistance of the covering parts obtained in the embodiments 1 to 3 was also tested by applying a concentrated force perpendicularly to the middle of one surface of the covering part, testing the deformation after the application of the force, and observing whether the covering part can recover its original shape after the force is removed.
Taking the high-strength aluminum alloy travel suitcase obtained in the embodiment 3 as an example, a steel cake with the thickness of 200mm and the phi of 200mm is arranged at the center of the face of one face with the size of 755mm multiplied by 500mm, the face of the travel suitcase is measured to move down 11-12 mm, and the steel cake immediately returns to be flat after being moved away; while a new beautiful (Samsonite)28 "draw-bar box (PC material) of the same size was permanently deformed and was completely unable to recover its flatness.
TABLE 1 Performance results for intermediate products and covering parts obtained in examples 1-3 and comparative example 1
In table 1, the minimum relative bend radius, typically measured from the bottom of the cover, meets two opposing vertical sidewalls; the minimum stretch fillet is typically measured from the intersection of two perpendicular sidewalls.
Wherein, the drawing depth in table 1, required for the cover structure in example 1, was only 4.65mm, the maximum drawing depth was not tested; the stretching depth in examples 2 to 3 was the maximum stretching depth.
Example 1, which had a drawing radius R2.5mm and a thickness of 0.625mm, was subjected to primary drawing, and corresponds to
The cylindrical part is stretched, the diameter of the cylindrical part is 5mm, the depth of the cylindrical part exceeds 4mm, and the high-strength aluminum is difficult to realize. Further, in the case of the above relative bending radius of 0.38, the two are performed in synchronization, which is hardly realized in the related art. By analogy, example 2 corresponds to
The cylindrical part of (2) is stretched to form a 6mm diameter and a depth of 115mm in one step, and example 3 is equivalent to a 4mm diameter and a depth of 120mm in one step.
The results in table 1 show that the covering part prepared by the preparation method provided by the invention has excellent forming effect, high rigidity and high strength; the laptop shell obtained in example 1 and the automobile door obtained in example 2 have extremely strong dent resistance and impact resistance (equivalent to example 3); the strength and rigidity of the suitcase obtained in the embodiment 3 are far greater than those of common plastic materials, and the suitcase has very strong impact resistance.
In the conventional technology (comparative example 1), the preparation of the thin-wall and deep-drawing characteristic covering part cannot be completed by firstly carrying out material preparation (solution treatment, quenching and aging treatment) and then carrying out forming treatment (drawing in step S2).
In conclusion, through the design of the preparation method, the contradiction between the high strength and the forming of the aluminum alloy is solved, and the high-strength covering part with the specific structure can be finally obtained.
While the embodiments of the present invention have been described in detail, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Claims (10)
1. The preparation method of the aluminum alloy covering part is characterized by comprising the following steps of:
s1, quenching an aluminum alloy plate strip after solution treatment;
s2, straightening the aluminum alloy plate strip processed in the step S1, and then carrying out forming treatment to obtain a covering piece blank;
s3, carrying out aging treatment on the covering piece blank;
the time interval between the solution treatment and the quenching is 1-8 s;
the time interval between the quenching and the forming treatment is less than or equal to 48 hours.
2. The production method according to claim 1, wherein in step S1, the material of the aluminum alloy sheet strip includes one of a 2-series aluminum alloy, a 6-series aluminum alloy, and a 7-series aluminum alloy.
3. The production method according to claim 1, wherein in step S2, the temperature of the molding treatment is-196 ℃ to 60 ℃.
4. The method of claim 1, wherein in step S2, the forming process includes at least one of bending, stretching, blanking, flanging, reaming, necking, spinning, and stamping.
5. The manufacturing method according to claim 4, wherein in the step S2, a protective film is provided on the surface of the aluminum alloy sheet strip during the forming process.
6. The method of claim 1, wherein the time interval between the quenching and forming processes is less than or equal to 5 hours.
7. The production method according to claim 1, further comprising performing an appearance treatment on the cover blank between the forming treatment and the aging treatment; preferably, the preparation method further comprises performing an appearance treatment on the aluminum alloy covering after the aging treatment.
8. An aluminum alloy covering member, characterized by being produced by the production method as recited in any one of claims 1 to 7.
9. The aluminum alloy cladding element of claim 8, wherein the aluminum alloy cladding element has a thickness of 0.5 to 3.0 mm.
10. The aluminum alloy cover of claim 8, wherein the aluminum alloy cover comprises at least one of a laptop housing, a cell phone housing, an automobile housing, and a trunk.
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| CN113913654A (en) * | 2021-10-28 | 2022-01-11 | 河南明晟新材料科技有限公司 | Preparation method of 6-series aluminum plate for battery pack lower shell of electric automobile |
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