CN112646991B - High-strength and high-surface aluminum alloy for mobile phone shell and preparation method thereof - Google Patents
High-strength and high-surface aluminum alloy for mobile phone shell and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of mobile phone shells, in particular to an aluminum alloy for a high-strength and high-surface mobile phone shell and a preparation method thereof, wherein the aluminum alloy comprises the following chemical components (wt%): 0.70% -1.4%, Fe: less than or equal to 0.15%, Cu: 0.60% -1.0%, Mn: 0.50% -0.80%, Mg: 0.60% -1.20%, Ti: ≦ 0.015%, other singles: less than or equal to 0.05 percent and the balance of aluminum. The invention optimally designs a new aluminum alloy chemical composition and a preparation process by combining the appearance requirement and the strength requirement of the high surface of the aluminum alloy for the mobile phone shell, greatly improves the yield strength of the alloy while ensuring the high surface quality of the aluminum alloy for the mobile phone shell, and meets the use requirement of the mobile phone shell material. The aluminum alloy is anodized after CNC, and has no material lines, black points, black lines, color difference and mottling defects, so that the rejection rate is greatly reduced; meanwhile, the aluminum alloy has high yield strength which is not lower than 360 MPa.
Description
Technical Field
The invention relates to the technical field of mobile phone shells, in particular to a high-strength high-surface aluminum alloy for a mobile phone shell and a preparation method thereof.
Background
With the popularization of smart phones and the improvement of living standards, aluminum alloys for mobile phone housings having a metallic texture and a high surface have been widely used. High-end smart phone casings have gradually eliminated traditional fuselage shells such as plastics, aluminum alloy die castings, stainless steel and titanium alloy, generally adopt the high surface high strength aluminum alloy through CNC and surface treatment. The 6000 series aluminum alloy extruded aluminum material is firstly applied to apple iPhone6 and apple iPhone6plus high-end smart phones, has the advantages of being rich in metal texture and color and the like, and is touted by the mobile phone market. The 6000 series aluminum alloy has excellent extrusion deformation processing performance, good anodic oxidation effect and low preparation cost, and is an ideal metal material for the mobile phone shell.
The basic principle of selecting the aluminum alloy material for the mobile phone shell is that after the anode of the alloy material is oxidized, the anode is oxidized after CNC (computerized numerical control) of the material, so that the mobile phone shell has high surface quality without defects of black spots, black lines, material grains, specks, color difference and the like, and meets the market demands of gorgeous and rich color, fashion trend and the like of the current high-end mobile phone shell; secondly, the yield strength, the corrosion resistance and the like of the alloy material meet the use requirements of structural strength, corrosion resistance and the like of the mobile phone shell; and thirdly, the alloy material has better plastic deformation processing performance, high technical maturity, less working procedures, short production flow and controllable preparation cost, and is suitable for large-scale industrial production.
With the continuous improvement of the quality requirement of the aluminum material surface of the mobile phone shell in the market, the surface of the aluminum alloy material after anodic oxidation is required to be almost zero defects, and the defects mainly comprise material line defects, black points, black lines, color difference, mottling and the like. At present, the latest smart phone adopts double-glass or double-glass curved screen, and the design must adopt high-strength metal material as the mobile phone shell for supporting. The 6063 and 6061 aluminum alloys commonly used in industry have lower strength and cannot meet the strength requirement of the mobile phone shell; the 7000 series aluminum alloy can meet the requirement of high strength of the mobile phone shell, but the extrudability of the alloy is relatively poor, and a special anodic oxidation process needs to be researched and developed, so that the preparation cost is high.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the 6000-series Al-Mg-Si-Cu aluminum alloy for the mobile phone shell, which has better extrusion deformation performance, corrosion resistance and anode oxidation performance, and has high surface and high strength.
In order to solve the technical problems, the invention provides the following technical scheme:
an aluminum alloy for a mobile phone shell is an Al-Mg-Si-Cu aluminum alloy, and the chemical composition of the Al-Mg-Si-Cu aluminum alloy comprises the following components in percentage by weight:
Si：0.70%-1.4%
Fe：≤0.15%
Cu： 0.60％-1.0%
Mn： 0.50%-0.80%
Mg： 0.60％-1.20%
Ti：≤0.015%
the other individual: less than or equal to 0.05 percent
The balance being aluminum.
Wherein the aluminum alloy is an aluminum alloy extruded strip plate, and the aluminum alloy is in a T6 state.
A preparation method of an aluminum alloy for a mobile phone shell comprises the following steps:
step (1), mixing aluminum alloy raw materials, smelting and casting to obtain an aluminum alloy ingot;
step (2) carrying out homogenization heat treatment, extrusion, online quenching and aging heat treatment on the aluminum alloy cast ingot obtained in the step to obtain the aluminum alloy for the mobile phone shell,
wherein, the step (1) is specifically as follows:
(1.1) batching an aluminum alloy raw material, charging into a furnace and melting to obtain a raw material melt;
(1.2) standing and refining the raw material melt obtained in the step, and performing online degassing and online filtering to obtain an alloy melt;
and (1.3) casting the alloy melt obtained in the step to obtain an aluminum alloy ingot.
Preferably, the Fe content in the aluminum alloy raw material in the step (1.1) is controlled to be less than the Fe content in the aluminum alloy composition; coating treatment is carried out on the iron tools which are contacted with the molten liquid in the processes of batching, charging and melting; during the material preparation, no titanium and/or aluminum-titanium intermediate alloy is added;
preferably, in the step (1.2), a Ti-containing refiner is added in line in a launder before an online refining and degassing device; the addition amount of the refiner containing Ti is 1.5-2.5 kg/t Al, wherein the refiner containing Ti is a filiform refiner; the refiner containing Ti is an Al-3Ti-C refiner.
Preferably, the melt temperature for refining degassing in the step (1.2) is 720-760 ℃; the refining degassing gas is inert gas; the flow rate of the inert gas for refining and degassing is 2.0-3.0m3 H; the hydrogen content of the melt after refining and degassing is less than or equal to 0.15cm3/100gAl。
Preferably, the casting in the step (1.3) is hot-top semi-continuous casting; the casting speed is 100-130mm/min, and the flow rate of the cooling water for casting is 20-30m3H; the specification of the aluminum alloy ingot is 178mm in diameter.
Preferably, the heating temperature during the homogenization heat treatment in the step (2) is 540-560 ℃, and the heating and heat preservation time is 360-720 min.
Preferably, the heating temperature of the aluminum alloy ingot casting in the step (2) is 510-530 ℃, the heating temperature of the mold is 450-480 ℃, the heating temperature of the extrusion cylinder is 450-480 ℃, the extrusion speed is 1.2-1.8m/min, the aluminum alloy extrusion strip plate is obtained through extrusion, and the online quenching of the aluminum alloy extrusion strip plate is normal temperature water cooling.
Preferably, the temperature of the aging heat treatment in the step (2) is 165-180 ℃, and the heat preservation time of the aging heat treatment is 240-480 min.
The invention has the following beneficial effects: the invention optimally designs a new aluminum alloy chemical composition and a preparation process by combining the appearance requirement and the strength requirement of the high surface of the aluminum alloy for the mobile phone shell, greatly improves the yield strength of the alloy while ensuring the high surface quality of the aluminum alloy for the mobile phone shell, and meets the use requirement of the mobile phone shell material. The aluminum alloy is anodized after CNC, and has no material lines, black points, black lines, color difference and mottling defects, so that the rejection rate is greatly reduced; meanwhile, the aluminum alloy has high yield strength which is not lower than 360 MPa. The Al-Mg-Si-Cu aluminum alloy has the advantages of few production and processing procedures, low preparation cost, suitability for popularization and application of industrial mass production, good economic benefit and wide market prospect.
Drawings
FIG. 1 is an anodic oxidation diagram of a cell phone case made using the aluminum alloy prepared in example 1;
FIG. 2 is an anodic oxidation diagram of a handset housing made from the aluminum alloy prepared in example 2;
fig. 3 is an anodic oxidation diagram of a handset case made using the aluminum alloy prepared in example 3.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
All of the starting materials of the present invention, without particular limitation as to their source, may be purchased commercially or prepared according to conventional methods well known to those skilled in the art.
All raw materials of the invention are not particularly limited in purity, and the invention preferably adopts the purity requirements which are conventional in the industrial purity or aluminum alloy preparation field.
All the raw materials, the marks and the acronyms of the raw materials belong to the conventional marks and the acronyms in the field, each mark and acronym are clear and definite in the field of related application, and the raw materials can be purchased from the market or prepared by a conventional method by a person skilled in the art according to the marks, the acronyms and the corresponding application.
The aluminum alloy mobile phone shell is obtained by smelting, casting, homogenizing heat treatment, extrusion, aging heat treatment, machining and anodic oxidation; the definition of the aluminum alloy mobile phone shell is not particularly limited in the present invention, and the aluminum alloy mobile phone shell known to those skilled in the art may be used, and those skilled in the art may select and adjust the aluminum alloy mobile phone shell according to the actual application, product requirements and quality requirements, and the aluminum alloy mobile phone shell of the present invention is preferably an aluminum alloy shell of a mobile phone or preferably an aluminum alloy middle frame of a mobile phone.
Example one
An aluminum alloy for a mobile phone shell is an Al-Mg-Si-Cu aluminum alloy, and the chemical compositions of the Al-Mg-Si-Cu aluminum alloy comprise (wt%) 1.01% of Si, 0.08% of Fe, 0.73% of Cu, 0.51% of Mn, 0.96% of Mg, 0.01% of Ni, 0.01% of Zn, 0.012% of Ti, less than or equal to 0.05% of single impurity, less than or equal to 0.15% of total impurity and the balance of Al.
The specification of the cast ingot is 178mm in diameter;
preparing materials: controlling Fe in the raw materials to be less than or equal to 0.12 percent during stokehole batching; ti is not added in front of the furnace, the waste material is used, the sum of the Ti content in the waste material and the Ti content in the aluminum ingot is ensured to be less than or equal to 0.005 percent, and the Ti content in the final finished cast ingot is less than or equal to 0.020 percent; tools such as a slag removing head, a sampling spoon and the like which are contacted with molten aluminum are brushed before each use.
On-line melt refining purification: the melt refining temperature is 720-760 ℃, and the refining gas adopts high-purity argon.
Melt filtration: the melt was filtered on-line using inlet 40PPI + inlet 50PPI filter plate.
Online refining: ti is not added in front of the furnace, and Al-3Ti-C wire refiner is added on line, and the addition amount is l.8Kg/tAl.
Hydrogen measurement: controlling the hydrogen content of the alloy melt to be less than or equal to 0.15cm3And/100 gAl. Performing liquid hydrogen measurement for each melting time; on-line liquid hydrogen measurement is 0.11cm3/100gAl。
The casting process comprises the following steps: the casting temperature is 735 ℃; the casting speed is 115 mm/min; the flow rate of casting cooling water is 26m3/h。
Homogenizing cast ingots: the heating temperature of the cast ingot is 560 ℃, the heat preservation time is 480mm, and the cooling mode is
Discharging and air cooling.
Machining an ingot casting machine: and after the head and the tail of the cast ingot are cut off, machining and turning a leather to remove the surface defect layer of the cast rod.
An extrusion process: the heating temperature of the cast ingot is 520 ℃, the heating temperature of the die is 460 ℃, and the heating temperature of the extrusion cylinder is
The temperature is 450 ℃, the extrusion speed is l.2m/mm, the online room temperature water cooling (solution quenching) is carried out, the straightening deformation rate is 1.2 percent, and the aging heat treatment process is 175 ℃/300min
The extruded strip plate had a gauge of 7.2X 79 mm.
The aluminum alloy extruded strip prepared in example 1 of the present invention was sampled and tested for mechanical properties at room temperature and surface hardness, see table 1.
The aluminum alloy extruded strip plate prepared in the embodiment 1 of the present invention is manufactured according to a manufacturing process of a mobile phone case, and is subjected to CNC, anodic oxidation and other steps to obtain an aluminum alloy mobile phone case, and fig. 1 is an appearance photograph of the mobile phone case prepared in the embodiment 1 of the present invention according to the above steps. As can be seen from figure 1, the material structure of the CNC back anodized mobile phone shell is compact without the defects of black spots, black lines, color difference, specks, material lines, sand holes and the like. And the cutting processing and corrosion resistance of the aluminum alloy material can meet the use requirements.
Example two
An aluminum alloy for a mobile phone shell is an Al-Mg-Si-Cu aluminum alloy, and the chemical compositions of the Al-Mg-Si-Cu aluminum alloy comprise (wt%) 0.93% of Si, 0.06% of Fe, 0.71% of Cu, 0.54% of Mn, 0.87% of Mg, 0.01% of Ni, 0.01% of Zn, 0.011% of Ti, less than or equal to 0.05% of single impurity, less than or equal to 0.15% of total impurity and the balance of Al.
The specification of the cast ingot is 178mm in diameter;
preparing materials: controlling Fe in the raw materials to be less than or equal to 0.12 percent during stokehole batching; ti is not added in front of the furnace, the waste material is used, the sum of the Ti content in the waste material and the Ti content in the aluminum ingot is ensured to be less than or equal to 0.005 percent, and the Ti content in the final finished cast ingot is less than or equal to 0.020 percent; tools such as a slag removing head, a sampling spoon and the like which are contacted with molten aluminum are brushed before each use.
On-line melt refining purification: the melt refining temperature is 720-760 ℃, and the refining gas adopts high-purity argon.
Melt filtration: the melt was filtered on-line using inlet 40PPI + inlet 50PPI filter plate.
Online refining: ti is not added in front of the furnace, and Al-3Ti-C wire refiner is added on line, and the adding amount is l.6Kg/tAl.
Hydrogen measurement:controlling the hydrogen content of the alloy melt to be less than or equal to 0.15cm3And/100 gAl. Performing liquid hydrogen measurement for each melting time; on-line liquid hydrogen measurement is 0.105cm3/100gAl。
The casting process comprises the following steps: the casting temperature is 740 ℃; the casting speed is 120 mm/min; the flow rate of casting cooling water is 27m3/h。
Homogenizing cast ingots: the heating temperature of the cast ingot is 550 ℃, the heat preservation time is 600mm, and the cooling mode is discharging and air cooling.
Machining an ingot casting machine: and after the head and the tail of the cast ingot are cut off, machining and turning a leather to remove the surface defect layer of the cast rod.
An extrusion process: the heating temperature of the cast ingot is 520 ℃, the heating temperature of the die is 480 ℃, and the heating temperature of the extrusion cylinder is
The temperature is 450 ℃, the extrusion speed is l.3m/mm, the on-line room temperature water cooling (solution quenching), the straightening deformation rate is 1.4 percent, and the aging heat treatment process is 175 ℃/300min
The extruded strip plate had a gauge of 7.2X 79 mm.
The aluminum alloy extruded strip prepared in example 2 of the present invention was sampled and tested for room temperature mechanical properties and surface hardness, see table 1.
The aluminum alloy extruded band plate prepared in the embodiment 2 of the present invention is manufactured by referring to a manufacturing process of a mobile phone case, and is subjected to CNC, anodic oxidation and other steps to obtain an aluminum alloy mobile phone case, and fig. 2 is an appearance photograph of the mobile phone case prepared in the embodiment 2 of the present invention according to the above steps. As can be seen from FIG. 2, the material structure of the CNC back anodized mobile phone shell is compact without the defects of black spots, black lines, color difference, specks, material lines, sand holes and the like. And the cutting processing and corrosion resistance of the aluminum alloy material can meet the use requirements.
EXAMPLE III
An aluminum alloy for a mobile phone shell is an Al-Mg-Si-Cu aluminum alloy, and the chemical compositions of the Al-Mg-Si-Cu aluminum alloy comprise (wt%) 0.72% of Si, 0.05% of Fe, 0.80% of Cu, 0.64% of Mn, 0.89% of Mg, 0.01% of Ni, 0.01% of Zn, 0.012% of Ti, less than or equal to 0.05% of single impurity, less than or equal to 0.15% of total impurity and the balance of Al.
A preparation method of an aluminum alloy for a mobile phone shell comprises the following steps:
step (1), mixing aluminum alloy raw materials, smelting and casting to obtain an aluminum alloy ingot;
and (2) carrying out homogenization heat treatment, extrusion, online quenching and aging heat treatment on the aluminum alloy cast ingot obtained in the step to obtain an aluminum alloy extrusion strip plate for the mobile phone shell.
Wherein, the step (1) is specifically as follows:
(1.1) batching an aluminum alloy raw material, charging into a furnace and melting to obtain a raw material melt;
(1.2) standing and refining the raw material melt obtained in the step, and performing online degassing and online filtering to obtain an alloy melt;
and (1.3) casting the alloy melt obtained in the step to obtain an aluminum alloy ingot.
The Fe content in the aluminum alloy raw material in the step (1.1) is controlled to be less than the Fe content in the aluminum alloy composition; coating treatment is carried out on the iron tools which are contacted with the molten liquid in the processes of batching, charging and melting; during the material preparation, no titanium and/or aluminum-titanium intermediate alloy is added;
in the step (1.2), a refiner containing Ti is added in a runner before an online refining and degassing device; the addition amount of the refiner containing Ti is 2.1 kg/t Al, wherein the refiner containing Ti is a filiform refiner; the refiner containing Ti is an Al-3Ti-C refiner.
The melt temperature for refining and degassing in the step (1.2) is 700 ℃; the refining degassing gas is inert gas; the flow rate of the inert gas for refining and degassing is 2.5m3 H; the hydrogen content of the melt after refining and degassing is less than or equal to 0.15cm3/100gAl。
The casting in the step (1.3) is hot-top semi-continuous casting; the casting speed is 120mm/min, and the casting cooling water flow is 25m3H; the specification of the aluminum alloy ingot is 178mm in diameter.
The heating temperature in the homogenization heat treatment in the step (2) is 550 ℃, and the heating and heat preservation time is 600 min.
And (3) in the step (2), when the aluminum alloy cast ingot is extruded and deformed, heating temperature is 520 ℃, heating temperature of a die is 470 ℃, heating temperature of an extrusion cylinder is 470 ℃, extrusion speed is 1.5m/min, an aluminum alloy extrusion strip plate is obtained through extrusion, and the aluminum alloy extrusion strip plate is quenched at normal temperature by water cooling.
The temperature of the aging heat treatment in the step (2) is 170 ℃, and the heat preservation time of the aging heat treatment is 360 min.
The aluminum alloy extruded strip prepared in example 3 of the present invention was sampled and tested for room temperature mechanical properties and surface hardness, see table 1.
The aluminum alloy extruded band plate prepared in the embodiment 3 of the present invention is manufactured by referring to a manufacturing process of a mobile phone case, and is subjected to CNC, anodic oxidation and other steps to obtain an aluminum alloy mobile phone case, and fig. 3 is an appearance photograph of the mobile phone case prepared in the embodiment 3 of the present invention according to the above steps. As can be seen from FIG. 3, the material structure of the CNC back anodized mobile phone shell is compact without the defects of black spots, black lines, color difference, specks, material lines, sand holes and the like. And the cutting processing and corrosion resistance of the aluminum alloy material can meet the use requirements.
Example four
An aluminum alloy for a mobile phone case is an Al-Mg-Si-Cu aluminum alloy, and the chemical composition of the Al-Mg-Si-Cu aluminum alloy comprises (wt%) 0.89% of Si, 0.09% of Fe, 0.74% of Cu, 0.60% of Mn, 0.95% of Mg, 0.01% of Ni, 0.01% of Zn, 0.013% of Ti, less than or equal to 0.05% of single impurities, less than or equal to 0.15% of total impurities, and the balance of Al.
The specification of the cast ingot is 178mm in diameter;
preparing materials: controlling Fe in the raw materials to be less than or equal to 0.12 percent during stokehole batching; ti is not added in front of the furnace, the waste material is used, the sum of the Ti content in the waste material and the Ti content in the aluminum ingot is ensured to be less than or equal to 0.005 percent, and the Ti content in the final finished cast ingot is less than or equal to 0.020 percent; tools such as a slag removing head, a sampling spoon and the like which are contacted with molten aluminum are brushed before each use.
On-line melt refining purification: the melt refining temperature is 720-760 ℃, and the refining gas adopts high-purity argon.
Melt filtration: the melt was filtered on-line using inlet 40PPI + inlet 50PPI filter plate.
Online refining: ti is not added in front of the furnace, and Al-3Ti-C wire refiner is added on line, and the addition amount is l.8Kg/tAl.
Hydrogen measurement: controlling the hydrogen content of the alloy melt to be less than or equal to 0.15cm3And/100 gAl. Performing liquid hydrogen measurement for each melting time; on-line liquid hydrogen measurement is 0.113cm3/100gAl。
And (3) casting process: the casting temperature is 740 ℃; the casting speed is 125 mm/min; the flow rate of casting cooling water is 27m3/h。
Homogenizing cast ingots: the heating temperature of the cast ingot is 560 ℃, the heat preservation time is 480mm, and the cooling mode is
Discharging and air cooling.
Machining an ingot casting machine: and after the head and the tail of the cast ingot are cut off, machining and turning a leather to remove the surface defect layer of the cast rod.
An extrusion process: the heating temperature of the cast ingot is 525 ℃, the heating temperature of the die is 480 ℃, and the heating temperature of the extrusion cylinder is 525 DEG C
The temperature is 480 ℃, the extrusion speed is l.2m/mm, the online room temperature water cooling (solution quenching) is carried out, the straightening deformation rate is 1.2 percent, and the aging heat treatment process is 170 ℃/300min
The extruded strip plate had a gauge of 7.2X 79 mm.
The aluminum alloy extruded strip prepared in example 4 of the present invention was sampled and tested for room temperature mechanical properties and surface hardness, see table 1.
Experimental research and industrial batch production show that the high-surface high-strength aluminum alloy extruded strip plate is subjected to anodic oxidation after CNC, the aluminum alloy mobile phone shell material is compact in structure and free of defects such as black lines, specks, color difference, material lines and sand holes, and the processing forming performance, the machining performance, the corrosion resistance and the mechanical performance of the material meet the use requirements.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. An aluminum alloy for mobile phone housings, characterized in that: the aluminum alloy is an Al-Mg-Si-Cu aluminum alloy, and the chemical compositions of the Al-Mg-Si-Cu aluminum alloy (wt%) comprise 1.01% of Si, 0.08% of Fe, 0.73% of Cu, 0.51% of Mn, 0.96% of Mg, 0.01% of Ni, 0.01% of Zn, 0.012% of Ti, less than or equal to 0.05% of single impurity, less than or equal to 0.15% of total impurity and the balance of Al;
the specification of the cast ingot is 178mm in diameter;
preparing materials: controlling Fe in raw materials to be less than or equal to 0.12 percent during stokehole batching; ti is not added in front of the furnace, the waste material is used, the sum of the Ti content in the waste material and the Ti content in the aluminum ingot is ensured to be less than or equal to 0.005 percent, and the Ti content in the final finished cast ingot is less than or equal to 0.020 percent;
on-line melt refining purification: the melt refining temperature is 720-760 ℃, and the refining gas adopts high-purity argon;
melt filtration: filtering the melt by adopting an inlet 40PPI plus an inlet 50PPI filter plate on line;
online refining: ti is not added in front of the furnace, and Al-3Ti-C wire refiner is added on line, and the addition amount is l.8Kg/tAl;
hydrogen measurement: controlling the hydrogen content of the alloy melt to be less than or equal to 0.15cm3/100gAl；
Performing liquid hydrogen measurement for each melting time; on-line liquid hydrogen measurement is 0.11cm3/100gAl；
And (3) casting process: the casting temperature is 735 ℃; the casting speed is 115 mm/min; the flow rate of casting cooling water is 26m3/h；
Homogenizing cast ingots: the heating temperature of the cast ingot is 560 ℃, the heat preservation time is 480mm, and the cooling mode is
Discharging and air cooling;
machining an ingot casting machine: after the head and the tail of the cast ingot are cut off, machining and turning a leather to remove a surface defect layer of the cast rod;
an extrusion process: the ingot heating temperature is 520 ℃, the die heating temperature is 460 ℃, the extrusion barrel heating temperature is 450 ℃, the extrusion speed is l.2m/mm, the online room temperature water cooling (solution quenching) is carried out, the straightening deformation rate is 1.2%, the aging heat treatment process is 175 ℃/300min, and the specification of the extruded strip plate is 7.2 multiplied by 79 mm.
2. An aluminum alloy for mobile phone housings, characterized in that: the aluminum alloy is an Al-Mg-Si-Cu aluminum alloy, and the chemical compositions of the Al-Mg-Si-Cu aluminum alloy (wt%) comprise 0.93% of Si, 0.06% of Fe, 0.71% of Cu, 0.54% of Mn, 0.87% of Mg, 0.01% of Ni, 0.01% of Zn, 0.011% of Ti, less than or equal to 0.05% of single impurity, less than or equal to 0.15% of total impurity and the balance of Al;
the specification of the cast ingot is 178mm in diameter;
preparing materials: controlling Fe in the raw materials to be less than or equal to 0.12 percent during stokehole batching; ti is not added in front of the furnace, the waste material is used, the sum of the Ti content in the waste material and the Ti content in the aluminum ingot is ensured to be less than or equal to 0.005 percent, and the Ti content in the final finished cast ingot is less than or equal to 0.020 percent;
on-line melt refining purification: the melt refining temperature is 720-760 ℃, and the refining gas adopts high-purity argon;
melt filtration: filtering the melt on line by adopting an inlet 40PPI plus an inlet 50PPI filter plate;
online refining: ti is not prepared in front of the furnace, and Al-3Ti-C wire refiner is added on line, and the adding amount is l.6 Kg/tAl;
hydrogen measurement: controlling the hydrogen content of the alloy melt to be less than or equal to 0.15cm3/100gAl；
Performing liquid hydrogen measurement for each melting time; on-line liquid hydrogen measurement is 0.105cm3/100gAl；
And (3) casting process: the casting temperature is 740 ℃; the casting speed is 120 mm/min; the flow rate of casting cooling water is 27m3/h；
Homogenizing cast ingots: heating the cast ingot at 550 ℃, keeping the temperature for 600mm, and taking the cast ingot out of the furnace for air cooling;
machining an ingot casting machine: after the head and the tail of the cast ingot are cut off, machining and turning a leather to remove a surface defect layer of the cast rod;
an extrusion process: the heating temperature of the cast ingot is 520 ℃, the heating temperature of the die is 480 ℃, and the heating temperature of the extrusion cylinder is
The temperature is 450 ℃, the extrusion speed is l.3m/mm, the online room temperature water cooling (solution quenching), the straightening deformation rate is 1.4 percent, the aging heat treatment process is 175 ℃/300min, and the specification of the extruded strip plate is 7.2 multiplied by 79 mm.
3. An aluminum alloy for mobile phone housings, characterized in that: the aluminum alloy is an Al-Mg-Si-Cu aluminum alloy, and the chemical composition of the Al-Mg-Si-Cu aluminum alloy comprises (wt%) 0.72% of Si, 0.05% of Fe, 0.80% of Cu, 0.64% of Mn, 0.89% of Mg, 0.01% of Ni, 0.01% of Zn, 0.012% of Ti, less than or equal to 0.05% of single impurity, less than or equal to 0.15% of total impurity and the balance of Al;
the preparation method of the aluminum alloy for the mobile phone shell comprises the following steps:
step (1), mixing aluminum alloy raw materials, smelting and casting to obtain an aluminum alloy ingot;
step (2) carrying out homogenization heat treatment, extrusion, online quenching and aging heat treatment on the aluminum alloy cast ingot obtained in the step to obtain an aluminum alloy extrusion strip plate for the mobile phone shell;
wherein, the step (1) is specifically as follows:
(1.1) batching an aluminum alloy raw material, charging into a furnace and melting to obtain a raw material melt;
(1.2) standing and refining the raw material melt obtained in the step, and performing online degassing and online filtering to obtain an alloy melt;
(1.3) casting the alloy melt obtained in the step to obtain an aluminum alloy ingot;
controlling the Fe content in the aluminum alloy raw material in the step (1.1) to be less than the Fe content in the aluminum alloy composition; coating treatment is carried out on the iron tools which are contacted with the molten liquid in the processes of batching, charging and melting; during the material preparation, no titanium and/or aluminum-titanium intermediate alloy is added;
in the step (1.2), a refiner containing Ti is added in a runner before an online refining and degassing device; the addition amount of the refiner containing Ti is 2.1 kg/t Al, wherein the refiner containing Ti is a filiform refiner; the refiner containing Ti is an Al-3Ti-C refiner;
the melt temperature for refining and degassing in the step (1.2) is 700 ℃; the refining degassing gas is inert gas; the flow rate of the inert gas for refining and degassing is 2.5m3 H; the hydrogen content of the melt after refining and degassing is less than or equal to 0.15cm3/100gAl；
The casting in the step (1.3) is hot-top semi-continuous casting; the casting speed is 120mm/min, and the casting cooling water flow is 25m3H; the specification of the aluminum alloy ingot is 178mm in diameter;
the heating temperature in the homogenization heat treatment in the step (2) is 550 ℃, and the heating and heat preservation time is 600 min;
heating temperature of 520 ℃ when the aluminum alloy cast ingot is extruded and deformed in the step (2), heating temperature of a die is 470 ℃, heating temperature of an extrusion cylinder is 470 ℃, extrusion speed is 1.5m/min, an aluminum alloy extrusion strip plate is obtained through extrusion, and online quenching of the aluminum alloy extrusion strip plate is normal-temperature water cooling;
the temperature of the aging heat treatment in the step (2) is 170 ℃, and the heat preservation time of the aging heat treatment is 360 min.
4. An aluminum alloy for mobile phone housings, characterized in that: the aluminum alloy is an Al-Mg-Si-Cu aluminum alloy, and the chemical composition of the Al-Mg-Si-Cu aluminum alloy comprises (wt%) 0.89% of Si, 0.09% of Fe, 0.74% of Cu, 0.60% of Mn, 0.95% of Mg, 0.01% of Ni, 0.01% of Zn, 0.013% of Ti, less than or equal to 0.05% of single impurity, less than or equal to 0.15% of total impurity and the balance of Al;
the specification of the cast ingot is 178mm in diameter;
preparing materials: controlling Fe in the raw materials to be less than or equal to 0.12 percent during stokehole batching; ti is not added in front of the furnace, the waste material is used, the sum of the Ti content in the waste material and the Ti content in the aluminum ingot is ensured to be less than or equal to 0.005 percent, and the Ti content in the final finished cast ingot is less than or equal to 0.020 percent;
on-line melt refining purification: the melt refining temperature is 720-760 ℃, and the refining gas adopts high-purity argon;
melt filtration: filtering the melt by adopting an inlet 40PPI plus an inlet 50PPI filter plate on line;
online refining: ti is not added in front of the furnace, and Al-3Ti-C wire refiner is added on line, and the addition amount is l.8Kg/tAl;
hydrogen measurement: controlling the hydrogen content of the alloy melt to be less than or equal to 0.15cm3/100gAl；
Performing liquid hydrogen measurement for each melting time; on-line liquid hydrogen measurement is 0.113cm3/100gAl；
And (3) casting process: the casting temperature is 740 ℃; the casting speed is 125 mm/min; the flow rate of casting cooling water is 27m3/h；
Homogenizing cast ingots: the heating temperature of the cast ingot is 560 ℃, the heat preservation time is 480mm, and the cooling mode is
Discharging and air cooling;
machining an ingot casting machine: after the head and the tail of the cast ingot are cut off, machining and turning a leather to remove a surface defect layer of the cast rod;
an extrusion process: the heating temperature of the cast ingot is 525 ℃, the heating temperature of the die is 480 ℃, and the heating temperature of the extrusion cylinder is 525 DEG C
The temperature is 480 ℃, the extrusion speed is l.2m/mm, the online room temperature water cooling (solution quenching), the straightening deformation rate is 1.2 percent, the aging heat treatment process is 170 ℃/300min, and the specification of the extruded strip plate is 7.2 multiplied by 79 mm.
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