CN114540652A - Method for manufacturing high-strength heat-treated alumina 6N63 for pen flat plate - Google Patents
Method for manufacturing high-strength heat-treated alumina 6N63 for pen flat plate Download PDFInfo
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- CN114540652A CN114540652A CN202210167374.7A CN202210167374A CN114540652A CN 114540652 A CN114540652 A CN 114540652A CN 202210167374 A CN202210167374 A CN 202210167374A CN 114540652 A CN114540652 A CN 114540652A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
- C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
-
- 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
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
-
- 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
- C22F1/047—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 of alloys with magnesium as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
Abstract
The invention discloses a method for manufacturing high-strength heat-treated alumina 6N63 for a pen flat plate, which comprises the following steps: (1) preparing an aluminum alloy melt; (2) casting; (3) hot rolling; (4) cold rolling; (5) solution quenching; (6) continuously pulling and straightening the strip until the unevenness meets the required requirement. The 6N63 aluminum alloy strip manufactured by the invention is a novel aluminum-magnesium-silicon alloy; according to the invention, the components and the structure of the cast ingot are controlled by a casting process, and then the T4-state aluminum alloy strip with higher strength is obtained by optimized hot rolling, cold rolling and solution quenching processes, so that the hardness of the artificially aged strip can reach more than 90HV, and the yield strength Y.S (sigma 0.2/MPa) can reach more than 240 MPa. The pen level plate high-end alumina 6N63 manufactured by the invention can be formed by punching and then hardened by artificial aging, has good anode effect and meets the requirement of reducing the thickness of a product.
Description
Technical Field
The invention relates to the technical field of alumina, in particular to a method for manufacturing high-strength heat-treated alumina 6N63 for a pen flat plate.
Background
The existing aluminum materials for the notebook mainly comprise two types: firstly, 5 traditional punching press board strips have moderate intensity, have better anodic oxidation effect, but intensity is moderate, and the material thickness of product is from 0.8MM attenuate to 0.6MM back, on jumbo size notebook computer, the holding power descends rapidly to be not suitable for the attenuate product. And secondly, the traditional 6-series aluminum extruded section has medium and high strength and good anode effect, but the section with the thickness being several times to ten times larger than the actual thickness of the product is required to be subjected to full milling forming, the CNC has high cost, the material utilization rate is as low as 10% -30%, and under the large background of energy conservation, emission reduction and carbon emission reduction, the utilization rate of the aluminum material is also urgently required to be improved and the processing cost is reduced.
The whole area of a pen level plate is large, and the plate surface is easy to deform in the processes of stamping, CNC machining, polishing and sand blasting, so that the whole assembly effect is influenced. Particularly, 5052/5252 has large deformation and obvious stress concentration after reaching over 75HV, needs multiple shaping to meet the requirement and has high fraction defective.
Under the background of a new era, the design of the pen electric shell is more and more complex, and the original aluminum alloy is easy to break in the stretching process due to high hardness and insufficient fluidity when being stretched and formed at high hardness, so that the ideal processing effect cannot be achieved.
Disclosure of Invention
In view of the above, the present invention provides a method for manufacturing high strength heat-treated alumina 6N63 for pen flat plate, which is manufactured by improving chemical composition formula and optimizing production process based on original 6063 material, and the aluminum alloy plate strip has mechanical properties 40% -60% higher than 5052 and 5252 alloy H32 state after T6 aging treatment, and excellent forming effect: the yield strength Y.S (sigma 0.2/MPa) can reach over 240MPa, and the surface hardness is over 90 HV.
In order to achieve the purpose, the invention adopts the following technical scheme:
a manufacturing method of high-strength heat-treated alumina 6N63 for a pen flat plate comprises the following steps:
(1) preparing an aluminum alloy solution: determining chemical components, wherein the mass percent of each element in the aluminum alloy is Si: 0.45% -0.65%, Fe: less than or equal to 0.35 percent, Cu: less than or equal to 0.10 percent, Mg: 0.7% -0.95%, Zn: less than or equal to 0.1 percent, Ti: less than or equal to 0.1 percent and the balance of aluminum; respectively weighing high-purity aluminum ingots with the aluminum content of 99.85 percent and aluminum-iron intermediate alloys as raw materials according to the mass percent of the elements, then adding the raw materials into a smelting furnace, and smelting the raw materials into aluminum alloy melt at the temperature of 720-750 ℃;
(2) casting: casting the aluminum alloy solution according to the casting temperature of 710-730 ℃ and the casting speed of 60-65 mm/min, discharging from a furnace, air cooling, turning a leather, and sawing into aluminum alloy ingots with the specification of 500mm × 1350mm × 7500 mm;
(3) hot rolling: hot rolling the aluminum alloy ingot at 300-400 ℃ with the specification of 3.5mm multiplied by 1350 mm;
(4) cold rolling: carrying out intermediate cold rolling and finished product cold rolling on the material obtained in the step (3) at a working rate of 20% each time until the material is rolled to the specification of 0.6mm multiplied by 1350 mm;
(5) solution quenching: heating the material obtained in the step (4) to 520-530 ℃, keeping the temperature for 5-10 minutes, and then performing wind quenching within 15 seconds to prepare a T4 state 6N63 strip, wherein the hardness is controlled to be 50-70 HV;
(6) and continuously pulling and straightening the strip until the unevenness meets the required requirement, thus finishing the manufacture of the high-strength heat-treated alumina 6N63 which can be used for pen flat plates.
Compared with the prior art, the invention has obvious advantages and beneficial effects, and specifically, the technical scheme shows that:
1. the 6N63 aluminum alloy strip manufactured by the invention is a novel aluminum-magnesium-silicon alloy; according to the invention, the components and the structure of the cast ingot are controlled by a casting process, and then the T4-state aluminum alloy strip with higher strength is obtained by optimized hot rolling, cold rolling and solution quenching processes, so that the hardness of the artificially aged strip can reach more than 90HV, and the yield strength Y.S (sigma 0.2/MPa) can reach more than 240 MPa. The pen level plate high-end alumina 6N63 manufactured by the invention can be formed by punching and then hardened by artificial aging, has good anode effect and meets the requirement of reducing the thickness of a product.
2. The method realizes that the aluminum alloy strip has high strength, good formability and good anode oxidizability at the rear section, and does not need to increase special equipment.
3. The alloy proportion of the product of the invention adopts high-purity aluminum ingot as raw material, improves the contents of Si and Mg elements, controls the content ratio of Mg/Si between 1.45 and 1.55, ensures that the content of Si is excessive between 0.10 percent and 0.15 percent except for generating strengthening phase Mg2Si, and can improve the tensile strength of 6N63 in T6 state. Meanwhile, the solid solution quenching temperature is increased to 520-530 ℃, Mg and Si can be dissolved in aluminum to the maximum extent to form more strengthening phases Mg2Si, and the strength and the hardness after aging are increased.
4. The aluminum alloy strip manufactured by the invention is used for the upper cover, the lower cover and the middle frame of the pen electric flat plate, and the aging strength can be enhanced after the material is subjected to punch forming, so that the material with the thickness of 0.6mm can be used for replacing the material with the thickness of 0.8mm, the investment of metal raw materials in the production process is saved, and the purposes of reducing energy consumption and processing cost are achieved.
Detailed Description
The invention discloses a method for manufacturing high-strength heat-treated alumina 6N63 for a pen flat plate, which comprises the following steps:
(1) preparing an aluminum alloy solution: determining chemical components, wherein the mass percent of each element in the aluminum alloy is Si: 0.45% -0.65%, Fe: less than or equal to 0.35 percent, Cu: less than or equal to 0.10 percent, Mg: 0.7% -0.95%, Zn: less than or equal to 0.1 percent, Ti: less than or equal to 0.1 percent and the balance of aluminum; respectively weighing high-purity aluminum ingots with the aluminum content of 99.85 percent and aluminum-iron intermediate alloys as raw materials according to the mass percent of the elements, then adding the raw materials into a smelting furnace, and smelting the raw materials into aluminum alloy melt at the temperature of 720-750 ℃.
(2) Casting: casting the aluminum alloy solution according to the casting temperature of 710-730 ℃ and the casting speed of 60-65 mm/min, discharging from a furnace, air cooling, turning a leather, and sawing into aluminum alloy ingots with the specification of 500mm × 1350mm × 7500 mm.
(3) Hot rolling: the aluminum alloy cast ingot is hot rolled at 300-400 ℃ and the specification is 3.5mm multiplied by 1350 mm.
(4) Cold rolling: and (4) carrying out intermediate cold rolling and finished product cold rolling on the material obtained in the step (3) at a reduction rate of 20% each time until the material is rolled to the specification of 0.6mm multiplied by 1350 mm.
(5) Solution quenching: heating the material obtained in the step (4) to 520-530 ℃, keeping the temperature for 5-10 minutes, and then performing air quenching within 15 seconds to prepare a T4 state 6N63 strip, wherein the hardness is controlled to be 50-70 HV.
(6) And continuously pulling and straightening the strip until the unevenness meets the required requirement, thus finishing the manufacture of the high-strength heat-treated alumina 6N63 which can be used for pen flat plates.
The composition adjustment and solution quenching in the present invention are explained below.
The medium aluminum alloy adopts high-purity aluminum ingots as raw materials, improves the contents of Si and Mg elements, controls the content ratio of Mg/Si to be between 1.45 and 1.55, ensures that the content of Si is excessive to be between 0.10 and 0.15 percent except for generating a strengthening phase Mg2Si, and can improve the tensile strength of 6N63 in a T6 state. In general, in 6-series alloys, the Mg/Si ratio is 1.73 or less, and an excess amount of silicon is secured, thereby improving the strength. The Mg/Si content ratio of the invention is between 1.45 and 1.55, the excess silicon is between 0.1 and 0.15 percent, the strength of the alloy is high, and the invention meets the component preparation requirements of 6-series alloy.
Meanwhile, the heat preservation time is controlled to be 5-10 minutes, so that the crystal grains are prevented from growing and being controllable, and the risk of mechanical property reduction caused by the enlargement and unevenness of the crystal grains is avoided; the solid solution quenching temperature is increased to 520-530 ℃, and the Mg and Si can be dissolved in the aluminum to the maximum extent by adopting a wind quenching mode to form more strengthening phases Mg2Si, so that the strength and the hardness after aging are increased.
The invention also reduces the content of Cu element, reduces the generation of Cu2Mg8Si6Al5, enables Mg and Si dissolved in the aluminum matrix to form a strengthening phase Mg2Si to the maximum extent, and is not replaced by the Cu2Mg8Si6Al5 phase, thereby avoiding the natural aging of the alloy.
The following examples were used to demonstrate the beneficial effects of the present invention:
the composition of the invention 6N63 is changed into Si: 0.45% -0.65%, Fe: less than or equal to 0.35 percent, Cu: less than or equal to 0.10 percent, Mg: 0.7% -0.95%, Zn: less than or equal to 0.1 percent, Ti: less than or equal to 0.1 percent and the balance of aluminum, as shown in the following table.
The strength of the 6N63 of the invention is improved, compared with the mechanical properties of 5052-H32 and 5252-H32 with the highest strength: the 6N63 strength was 40% -60% higher as shown in the following table.
The 6N63 of the invention is stamped and formed under the condition of T4, the hardness is 60HV, and the comparison with the large-size flatness of more than 14 inches stamped when 5052/5252 is 75HV is shown in the following table:
comparison of the flatness of the final product (large size shell size above 14 inches) for the invention 6N63 artificially aged to a T6 temper hardness of 100HV, versus 5052/5252 at 75HV, is shown in the following table:
comparison of the flatness of the inventive 6N63 stamped product in the T4 temper with the artificially aged product in the T6 temper (large size shell size over 14 inches) is shown in the following table:
compared with the anode 5052/5252, the invention has the following advantages that the 6N63 has the following effect:
from the above data, it can be seen that the aluminum alloy sheet 6N63 manufactured in this example is suitable for the design requirements of the new generation of thinning and lightening.
The invention 6N63 is more suitable for various complex forming processes.
1. The material 6N63 has high strength, so that the material has wide prospect in the use of pen electric flat plates. Not only can reduce the cost of using aluminium, reduce the processing cost, keep the anodic oxidation effect, but also can attenuate the product, promote the appearance grade. The method has universal applicability to high, medium and low-end brands of pen electric flat plates.
2. The material 6N63 can be used as a substitute of high-strength alumina, and meets the requirements of end designers on quality improvement and cost reduction. Has good application prospect in the field of anodic alumina.
3. The material 6N63 can be made into different thicknesses according to requirements, is used for appearance accessories of mobile phones, computers, automobiles, digital products, electric appliances and electronic cigarettes, keeps attractive appearance and reduces cost.
4. The material 6N63 can be used for surface wire drawing, sand blasting and other treatments, and meets the pursuit of different consumers on the appearance of products.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (1)
1. A manufacturing method of high-strength heat-treated alumina 6N63 for a pen flat plate is characterized by comprising the following steps: the method comprises the following steps:
(1) preparing an aluminum alloy solution: determining chemical components, wherein the mass percent of each element in the aluminum alloy is Si: 0.45% -0.65%, Fe: less than or equal to 0.35 percent, Cu: less than or equal to 0.10 percent, Mg: 0.7% -0.95%, Zn: less than or equal to 0.1 percent, Ti: less than or equal to 0.1 percent and the balance of aluminum; respectively weighing high-purity aluminum ingots with the aluminum content of 99.85 percent and aluminum-iron intermediate alloys as raw materials according to the mass percent of the elements, then adding the raw materials into a smelting furnace, and smelting the raw materials into aluminum alloy melt at the temperature of 720-750 ℃;
(2) casting: casting the aluminum alloy solution according to the casting temperature of 710-730 ℃ and the casting speed of 60-65 mm/min, discharging from a furnace, air cooling, turning a leather, and sawing into aluminum alloy ingots with the specification of 500mm × 1350mm × 7500 mm;
(3) hot rolling: hot rolling the aluminum alloy ingot at 300-400 ℃ with the specification of 3.5mm multiplied by 1350 mm;
(4) cold rolling: carrying out intermediate cold rolling and finished product cold rolling on the material obtained in the step (3) at a working rate of 20% each time until the material is rolled to the specification of 0.6mm multiplied by 1350 mm;
(5) solution quenching: heating the material obtained in the step (4) to 520-530 ℃, keeping the temperature for 5-10 minutes, and then performing wind quenching within 15 seconds to prepare a T4 state 6N63 strip, wherein the hardness is controlled to be 50-70 HV;
(6) and continuously pulling and straightening the strip until the unevenness meets the required requirement, thus finishing the manufacture of the high-strength heat-treated alumina 6N63 which can be used for pen flat plates.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210167374.7A CN114540652A (en) | 2022-02-23 | 2022-02-23 | Method for manufacturing high-strength heat-treated alumina 6N63 for pen flat plate |
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| CN202210167374.7A CN114540652A (en) | 2022-02-23 | 2022-02-23 | Method for manufacturing high-strength heat-treated alumina 6N63 for pen flat plate |
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2022
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