CN113981282A - Aluminum alloy strip for liquid crystal backlight module back plate and preparation method and application thereof - Google Patents
Aluminum alloy strip for liquid crystal backlight module back plate and preparation method and application thereof Download PDFInfo
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- CN113981282A CN113981282A CN202111265703.3A CN202111265703A CN113981282A CN 113981282 A CN113981282 A CN 113981282A CN 202111265703 A CN202111265703 A CN 202111265703A CN 113981282 A CN113981282 A CN 113981282A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/005—Casting ingots, e.g. from ferrous metals from non-ferrous metals
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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
- 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
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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
- 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
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
Abstract
The invention discloses an aluminum alloy strip for a liquid crystal backlight module backboard and a preparation method and application thereof, and belongs to the technical field of aluminum alloy strip preparation. The components of the composition are as follows: less than 0.2 percent of Si, less than 0.3 percent of Fe, less than 0.1 percent of Cu, 0.15-0.5 percent of Mn, 5.2-6.2 percent of Mg5, less than 0.25 percent of Zn, less than 0.15 percent of Cr, less than 0.15 percent of Ti, the balance of Al and inevitable impurities. The preparation method comprises the following steps: casting, ingot casting homogenization treatment, hot rolling, cold rolling, degreasing and deoiling, stabilization treatment, stretch bending straightening and cutting. According to the aluminum alloy strip for the liquid crystal backlight module back plate, the aluminum alloy strip which is thin in thickness, high in strength and free of cracks in 0T bending (R angle is 0) is obtained by reasonably controlling the alloy component ratio and improving the traditional production process, and the aluminum alloy strip has popularization practicability.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy strip preparation, and particularly relates to an aluminum alloy strip for a liquid crystal backlight module back plate, and a preparation method and application thereof.
Background
The backlight plate for the 3C liquid crystal display mainly uses steel with higher strength from the initial development stage, but as electronic products develop towards the direction of light weight, thinning and function integration, adverse factors of the steel gradually appear, firstly, the specific gravity of the steel is large, and the whole backlight plate is heavier; secondly, the heat dissipation effect in a narrow space is poor; thirdly, the material has certain magnetism to influence signal receiving and transmitting. The three major disadvantages of steel can be perfectly solved by adopting the high-Mg aluminum alloy material, the key technical difficulty of the product is that the material is rapidly thinned, in order to improve the rigidity of the product, firstly, the strength of the material is improved as much as possible, and secondly, the frame at the part position in the forming process is designed into double folding edges (namely, the bending is carried out at 0T, and the R angle is 0). Under the existing conditions, an aluminum alloy material which has the strength of more than 370MPa and is not subjected to heat treatment and can not be strengthened in a 0T bending mode (the other heat treatment strengthening alloys are not qualified after being strengthened and then bent in a 0T mode; firstly, the production cost is increased after the first forming and then strengthening treatment, secondly, the deformation is serious after the high-temperature strengthening, thirdly, the surface quality is poor and the use requirement cannot be met), so that the components are required to be optimized again and the rolling process is required to be designed again, and the ultrathin aluminum alloy material with the strength of more than 370MPa and the 0T bending (the R angle is 0) without cracks is realized.
Disclosure of Invention
The invention aims to provide an aluminum alloy strip for a liquid crystal backlight module back plate and a preparation method thereof, so that the aluminum alloy strip can keep ultrahigh strength and has no crack at 0T bending (R angle is 0).
In order to achieve the purpose, the invention provides the following technical scheme:
1. an aluminum alloy strip for a liquid crystal backlight module back plate comprises the following components in percentage by weight: less than 0.2 percent of Si, less than 0.3 percent of Fe, less than 0.1 percent of Cu, 0.15-0.5 percent of Mn, 5.2-6.2 percent of Mg, less than 0.25 percent of Zn, less than 0.15 percent of Cr, less than 0.15 percent of Ti, the balance of Al and inevitable impurities.
Preferably, the paint comprises the following components in percentage by weight: 0.1% of Si, 0.16% of Fe, 0.08% of Cu, 0.45% of Mn, 5.8% of Mg, 0.1% of Zn, 0.12% of Cr, 0.09% of Ti, the balance of Al and inevitable impurities.
2. A preparation method of an aluminum alloy strip for a liquid crystal backlight module back plate comprises the following steps:
s1, casting: preparing materials according to the components and weight percentage of the aluminum alloy, forming alloy aluminum liquid through melting, refining, deslagging and degassing, and then performing semi-continuous casting to obtain an aluminum alloy slab ingot;
s2, ingot casting homogenization treatment: sawing the head and the tail of a flat ingot, milling the surface of the flat ingot, performing primary homogenization treatment for 2-4 hours at the temperature of 400-470 ℃, and performing secondary homogenization treatment for 4-6 hours at the temperature of 500-550 ℃;
s3, hot rolling: carrying out hot rough rolling on the aluminum alloy product subjected to the homogenization treatment of S2 at the initial rolling temperature of 450-490 ℃, and carrying out hot finish rolling at the final rolling temperature of 280-320 ℃ so that the thickness of the alloy product subjected to the hot finish rolling is 3.5-4.5 mm;
s4, cold rolling: cold rolling the aluminum alloy product obtained in the step S3, and reserving the machining rate of 30-65%;
s5, heat treatment: carrying out heat treatment on the aluminum alloy strip subjected to the S4 cold rolling in a box furnace with protective gas at the temperature of 320-350 ℃, wherein the oxygen content is less than 0.15%;
s6, cold rolling: rolling the aluminum alloy product treated by the S5 to 0.15-0.3 mm;
s7, degreasing and deoiling: degreasing and deoiling the product obtained in the step S6, wherein the dyne value is more than 38;
s8, stabilizing treatment: stabilizing the aluminum alloy product treated by the S7 at the temperature of 150-250 ℃ for 1-4 h;
s9, straightening and cutting: and straightening the finished product obtained in the step S8 through stretching, bending and straightening, and then cutting to obtain the aluminum alloy strip for the liquid crystal backlight module backboard.
Wherein, the reasonable soaking system can improve the conversion rate of the alpha phase and improve the shape and distribution of the AlFeMn phase; protective gas box-type furnace annealing is to avoid precipitation and oxidation of surface Mg of high-Mg aluminum alloy during high-temperature heat treatment, so that the surface quality is improved; degreasing and deoiling are to remove a loose oxidation film generated in the rolling process and improve surface aluminum powder; the stretching, bending and straightening aims to release the internal stress of the strip, so that the surface of the strip is flat, and subsequent slitting and stamping are facilitated.
Preferably, in S2, the temperature of the first homogenization treatment of the cast ingot is 400-470 ℃ and the time is 4 hours.
Preferably, in the step S2, the temperature of the second homogenization treatment of the cast ingot is 500-550 ℃ and the time is 5 hours.
Wherein, the ingot casting is subjected to twice homogenization treatment, so that the low-melting-point phase in the alloy product can be fully melted back, and the compound distribution is more dispersed and uniform. Experiments show that after the high-Mg aluminum alloy ingot is subjected to primary high-temperature homogenization treatment, the low-melting-point phase in the ingot is easy to overburn, so that the mechanical property and the forming property of the product are seriously influenced, after the homogenization treatment is performed for two times under different temperature conditions, the conversion rate of the alpha phase is improved, the shape and the distribution of the AlFeMn phase are improved, the compound composition distribution is more uniform, and the performance of the finished product is more excellent.
Preferably, in S3, the finish rolling temperature of the finish hot rolling is 320 ℃, and the thickness of the alloy product after the finish hot rolling is 4.0 mm.
Preferably, in S4, the cold working ratio is 35%.
Preferably, in the step S5, the heat treatment is carried out in a box furnace with protective gas at 320 ℃ for 3h, and the oxygen content is less than 0.15%.
The protective gas annealing is adopted to avoid precipitation and oxidation of surface Mg of the high-Mg aluminum alloy during high-temperature heat treatment, so that the surface quality is improved.
Preferably, in S7, the aluminum alloy product is degreased and degreased to a dyne value of 38 or more.
Wherein, the purpose of degreasing and deoiling is to remove loose oxide films generated in the rolling process and avoid aluminum powder accumulation in subsequent processing.
Preferably, in the S8, the aluminum alloy product is stabilized at the temperature of 210 ℃ for 2 h.
Wherein, the product after the stabilizing treatment improves the internal residual stress distribution of the strip again, avoids the performance attenuation when the product is used under the conditions of subsequent processing deformation and higher temperature, and ensures that the product is more stable in use. The tensile strength of the aluminum alloy product is above 385MPa, and the aluminum alloy product has no crack at 0T bending (R angle is 0).
3. An application of an aluminum alloy strip for a liquid crystal backlight module back plate.
The purity of the raw material aluminum adopted in the invention is 99.70-99.99%.
The raw materials in the preparation process of the invention can be directly purchased from the market.
Has the advantages that:
1) the aluminum alloy strip for the liquid crystal backlight module back plate provided by the invention takes Mg as a main alloy element, and the content of Mg and Mn in a melt is reasonably controlled, so that an aluminum alloy product can keep ultrahigh strength and has excellent 0T bending (R angle of 0) performance;
2) according to the preparation method of the aluminum alloy strip for the liquid crystal backlight module back plate, ingot casting is subjected to twice homogenization treatment, the segregation inside the ingot casting is eliminated, coarse second-phase compounds are reduced, the uniform distribution of the structure of the ingot casting is ensured, the temperature and the thickness of the hot finish rolling are controlled according to the thickness and the performance requirements of a final cold-rolled finished product, a proper deformation amount is reserved in the cold rolling process, high-temperature heat treatment is carried out in a protective gas heat treatment furnace, a fine and uniform recrystallized structure of crystal grains is obtained, the anisotropy of the product is improved, the surface dyne value of the aluminum alloy product is more than 38 after degreasing and oil removal, and the aluminum alloy material which has the tensile strength of more than 385MPa and is not subjected to high-strength heat treatment and has no crack in 0T bending (the R angle is 0) can be obtained;
3) according to the aluminum alloy strip for the liquid crystal backlight module back plate, the alloy component proportion is reasonably controlled, and meanwhile, the traditional production process is improved, so that the high-strength aluminum alloy strip with good surface quality and excellent bending performance is obtained, and the aluminum alloy strip is beneficial to popularization and application in industry.
Drawings
FIG. 1 is a flow chart of a method for preparing an aluminum alloy strip for a liquid crystal backlight module back plate according to the present invention.
Detailed Description
The invention is further described in the following description in conjunction with specific embodiments, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout.
Example 1
As shown in fig. 1, the method for preparing an aluminum alloy strip for a back plate of a liquid crystal backlight module in this embodiment includes the following steps:
s1, casting: according to weight percentage, Si is 0.12%, Fe is 0.18%, Cu is 0.1%, Mn is 0.45%, Mg is 5.8%, Zn is 0.09%, Cr is 0.10%, Ti is 0.10%, and the balance is Al, alloy aluminum liquid is formed after melting, refining, deslagging and degassing, and finally, semi-continuous casting is carried out to obtain an aluminum alloy slab ingot;
s2, ingot casting homogenization treatment: sawing the head and the tail of a flat ingot, milling the surface of the flat ingot, performing primary homogenization treatment in a pushing type heating furnace at 460 ℃ for 4 hours, and performing secondary homogenization treatment at 530 ℃ for 4 hours;
s3, hot rolling: carrying out hot rough rolling on the alloy product subjected to the homogenization treatment of S2 at the initial rolling temperature of 490 ℃, and carrying out hot finish rolling at the final rolling temperature of 300 ℃ so that the thickness of the alloy product subjected to the hot finish rolling is 4.5 mm;
s4, cold rolling: cold rolling the alloy product obtained in the step S3, wherein the reserved reduction ratio is 50%;
s5, heat treatment: carrying out heat treatment on the product obtained in the step S4 in a box type heat treatment furnace with protective gas at 320 ℃ for 3h, wherein the oxygen content is less than 0.12%;
s6, cold rolling: rolling the product obtained in the step S5 into a finished product;
s7, degreasing and deoiling: degreasing and deoiling the finished product obtained in the step S6;
s8, stabilizing treatment: stabilizing the finished product obtained in the step S7 at 210 ℃ for 2 h;
s9, straightening and cutting: and (5) overstretching, bending and straightening the product obtained in the step (S8), and then cutting the product to obtain the heat-treated non-strenthenable high-strength aluminum alloy strip for the liquid crystal backlight module backboard.
Through detection and analysis, the mechanical properties of the heat-treated non-strengthened high-strength aluminum alloy strip for the liquid crystal backlight module back plate prepared in the embodiment are specifically represented by tensile strength at room temperature of 390MPa and no crack at 0T bending (R angle of 0).
Example 2
As shown in fig. 1, the method for preparing a heat-treated non-strengthenable aluminum alloy strip for a backplane of a liquid crystal backlight module in this embodiment includes the following steps:
s1, casting: according to weight percentage, Si is 0.04%, Fe is 0.17%, Cu is 0.12%, Mn is 0.38%, Mg is 5.2%, and the balance is Al, alloy aluminum liquid is formed after melting, refining, deslagging and degassing, and finally semi-continuous casting is carried out to form an aluminum alloy slab ingot;
s2, ingot casting homogenization treatment: sawing the head and the tail of a flat ingot, milling the surface of the flat ingot, performing primary homogenization treatment in a pushing type heating furnace at the temperature of 460 ℃ for 3 hours, and performing secondary homogenization treatment at the temperature of 540 ℃ for 6 hours;
s3, hot rolling: carrying out hot rough rolling on the alloy product subjected to homogenization treatment in the S2 at the initial rolling temperature of 460 ℃, and carrying out hot finish rolling at the final rolling temperature of 320 ℃ so that the thickness of the alloy product subjected to hot finish rolling is 4.0 mm;
s4, cold rolling: cold rolling the alloy product obtained in the step S3, wherein the reserved reduction ratio is 55%;
s5, heat treatment: carrying out heat treatment on the product obtained in the step S4 in a heat treatment furnace with protective gas at 340 ℃ for 2h, wherein the oxygen content is less than 0.11%;
s6, cold rolling: rolling the product obtained in the step S5 into a finished product;
s7, degreasing and deoiling: degreasing and deoiling the finished product obtained in the step S6;
s8, stabilizing treatment: stabilizing the finished product obtained in the step S7 at 190 ℃ for 4 hours;
s9, straightening and cutting: and (5) overstretching, bending and straightening the product obtained in the step (S8), and then cutting the product to obtain the heat-treated non-strenthenable high-strength aluminum alloy strip for the liquid crystal backlight module backboard.
Through detection and analysis, the mechanical properties of the heat-treated non-strengthened high-strength aluminum alloy strip for the liquid crystal backlight module back plate prepared in the embodiment are specifically represented by the room-temperature tensile strength of 380MPa and no crack in 0T bending (R angle of 0).
Comparative example 1 or 2
The preparation method of the 5182 aluminum alloy strip comprises the following steps:
s1, casting: according to the weight percentage, Si is 0.07%, Fe is 0.28%, Cu is 0.01%, Mn is 0.07%, Mg is 4.5%, Cr is 0.19%, and the balance is Al, alloy aluminum liquid is formed after melting, refining, deslagging and degassing, and finally, semi-continuous casting is carried out to form an aluminum alloy slab ingot;
s2, ingot casting homogenization treatment: sawing the head and the tail of a flat ingot, milling the surface of the flat ingot, performing primary homogenization treatment in a pusher-type heating furnace at the temperature of 450 ℃ for 4 hours, and performing secondary homogenization treatment at the temperature of 540 ℃ for 4 hours;
s3, hot rolling: carrying out hot rough rolling on the alloy product subjected to homogenization treatment in the S2 at the initial rolling temperature of 480 ℃, and carrying out hot finish rolling at the final rolling temperature of 330 ℃ so that the thickness of the alloy product subjected to hot finish rolling is 4.5 mm;
s4, cold rolling: cold rolling the alloy product obtained in the step S3, wherein the reserved reduction ratio is 60%;
s5, heat treatment: carrying out heat treatment on the product obtained in the step S4 in a box furnace with protective gas at 320 ℃ for 4h, wherein the oxygen content is less than 0.1%;
s6, cold rolling: rolling the product obtained in the step S5 into a finished product;
s7, degreasing and deoiling: degreasing and deoiling the finished product obtained in the step S6;
s8, stabilizing treatment: stabilizing the finished product obtained in the step S7 at 200 ℃ for 2 h;
s9, straightening and cutting: and (4) straightening the product obtained in the step (S8) through overstretching bending, and then cutting to obtain the aluminum alloy strip with the tensile strength of 350MPa and the breakage after 0T bending (R angle of 0).
The heat treatment non-reinforceable high-strength aluminum alloy strip for the liquid crystal backlight module back plate solves the problem that the aluminum alloy strip prepared by the traditional process is broken under high strength and 0T bending (R angle is 0), and meets the quality requirement and the processing requirement of the aluminum alloy material for the liquid crystal backlight module back plate of the 3C electronic product for light transformation.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The aluminum alloy strip for the liquid crystal backlight module back plate is characterized by comprising the following components in percentage by weight: less than 0.2 percent of Si, less than 0.3 percent of Fe, less than 0.1 percent of Cu, 0.15-0.5 percent of Mn, 5.2-6.2 percent of Mg, less than 0.25 percent of Zn, less than 0.15 percent of Cr, less than 0.15 percent of Ti, the balance of Al and inevitable impurities.
2. The aluminum alloy strip for the back plate of the liquid crystal backlight module as claimed in claim 1, which comprises the following components in percentage by weight: 0.1% of Si, 0.16% of Fe, 0.08% of Cu, 0.45% of Mn, 5.8% of Mg5, 0.1% of Zn, 0.12% of Cr, 0.09% of Ti, the balance of Al and inevitable impurities.
3. The method for preparing the aluminum alloy strip for the back plate of the liquid crystal backlight module as claimed in claim 1 or claim 2, which comprises the following steps:
s1, casting: preparing materials according to the components and weight percentage of the aluminum alloy, forming alloy aluminum liquid through melting, refining, deslagging and degassing, and then performing semi-continuous casting to obtain an aluminum alloy slab ingot;
s2, ingot casting homogenization treatment: sawing the head and the tail of a flat ingot, milling the surface of the flat ingot, performing primary homogenization treatment for 2-4 hours at the temperature of 400-470 ℃, and performing secondary homogenization treatment for 4-6 hours at the temperature of 500-550 ℃;
s3, hot rolling: carrying out hot rough rolling on the aluminum alloy product subjected to the homogenization treatment of S2 at the initial rolling temperature of 450-490 ℃, and carrying out hot finish rolling at the final rolling temperature of 280-320 ℃ to ensure that the thickness of the alloy product subjected to the hot finish rolling is 3.5-4.5 mm;
s4, cold rolling: cold rolling the aluminum alloy product obtained in the step S3, and reserving the machining rate of 30-65%;
s5, heat treatment: annealing the aluminum alloy strip subjected to the S4 cold rolling in a box furnace with protective gas at the temperature of 320-360 ℃, wherein the oxygen content is less than 0.15%;
s6, cold rolling: rolling the aluminum alloy product treated by the S5 to 0.15-0.3 mm;
s7, degreasing and deoiling: degreasing and deoiling the product obtained in the step S6, wherein the dyne value is more than 38;
s8, stabilizing treatment: stabilizing the aluminum alloy product treated by the S7 at the temperature of 150-250 ℃ for 1-4 h;
s9, straightening and cutting: and straightening the finished product obtained in the step S8 through stretching, bending and straightening, and then cutting to obtain the aluminum alloy strip for the liquid crystal backlight module backboard.
4. The method for preparing the aluminum alloy strip for the back plate of the liquid crystal backlight module according to claim 3, wherein in S2, the temperature of the first homogenization treatment of the cast ingot is 400-470 ℃ and the time is 3 hours.
5. The method for preparing the aluminum alloy strip for the back plate of the liquid crystal backlight module according to claim 3, wherein in S2, the temperature of the second homogenization treatment of the cast ingot is 500-550 ℃ and the time is 5 hours.
6. The method for preparing the aluminum alloy strip for the back plate of the liquid crystal backlight module as claimed in claim 3, wherein in S3, the finish rolling temperature of the hot finish rolling is 300 ℃, and the thickness of the alloy product after the hot finish rolling is 4.5 mm.
7. The method for preparing the aluminum alloy strip for the back plate of the liquid crystal backlight module as claimed in claim 3, wherein the reserved cold deformation amount in S4 is 35%.
8. The method for preparing the aluminum alloy strip for the back plate of the liquid crystal backlight module as claimed in claim 3, wherein in S5, the heat treatment temperature in the protective gas box furnace is 330 ℃, the time is 2 hours, and the oxygen content is less than 0.15%.
9. The method for preparing the aluminum alloy strip for the back plate of the liquid crystal backlight module as claimed in claim 3, wherein the stabilizing treatment temperature in S8 is 180 ℃ and the stabilizing treatment time is 2 h.
10. Use of the aluminum alloy strip for a back plate of a liquid crystal backlight module according to claim 1 or claim 2 in a large-sized liquid crystal display.
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| CN115786749A (en) * | 2022-12-23 | 2023-03-14 | 苏州宇上实业有限公司 | 5-series aluminum alloy plate and preparation method thereof |
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|---|---|---|---|---|
| CN115369293A (en) * | 2022-04-08 | 2022-11-22 | 中铝瑞闽股份有限公司 | Al-Mg series aluminum plate strip for high-strength anodic oxidation and preparation method thereof |
| CN115369293B (en) * | 2022-04-08 | 2023-08-18 | 中铝瑞闽股份有限公司 | High-strength Al-Mg aluminum plate strip for anodic oxidation and preparation method thereof |
| CN115786749A (en) * | 2022-12-23 | 2023-03-14 | 苏州宇上实业有限公司 | 5-series aluminum alloy plate and preparation method thereof |
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Application publication date: 20220128 |