A method for preparing an aluminum alloy strip for a cover plate of a 3C product

Abstract

The application relates to a preparation method of an aluminum alloy strip for 3C product cover plates, and relates to the aluminum alloy preparation technical field.The application aims to solve the problems of poor surface flatness and unstable bending performance of the aluminum alloy strip for 3C product cover plates manufactured by the existing process.The high-precision aluminum ingot containing 0.5-0.7% Si and 0.8-1.0% Mg is added, air quenching of an air cushion furnace is carried out, a corresponding artificial aging process is matched, the air quenching production process of the finished product of the air cushion furnace is determined, the accuracy of the control of the parameters of each link of production is ensured, the product quality is stable in large-scale industrial production, the production control difficulty is low, the air quenching production process can guarantee that the aluminum strip surface is smooth and the plate shape is flat, the aluminum strip has good bending performance, and the product meeting the use requirements of users is produced.The application can obtain the preparation method of the aluminum alloy strip for 3C product cover plates.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy preparation technology, and specifically to a method for preparing aluminum alloy strip for cover plates of 3C products. Background Technology

[0002] With the rapid development of the information industry, there is an internal drive for the refinement of raw material performance and surface requirements. Currently, most aluminum materials used for 3C product cover plates employ 6-series water quenching technology, resulting in unstable product surface finish, flatness, and bending performance. Therefore, this invention utilizes Al-Si alloys, high-precision aluminum ingots for casting, and employs air quenching in an air cushion furnace, combined with corresponding artificial aging processes, to determine a production process for aluminum alloy strips used in 3C product cover plates. This aims to solve many problems existing in current aluminum materials used for 3C product cover plates and effectively improve the various properties of aluminum alloy strips used in 3C product cover plates. Summary of the Invention

[0003] The purpose of this invention is to solve the problems of poor surface flatness and unstable bending performance of aluminum alloy strips for 3C product cover plates manufactured by existing processes, and to provide a method for preparing aluminum alloy strips for 3C product cover plates.

[0004] A method for preparing aluminum alloy strip for 3C product cover plates, comprising the following steps:

[0005] Step 1: Weigh out high-precision aluminum ingots, aluminum-magnesium master alloys, and aluminum-silicon master alloys according to the following mass fractions: Si 0.5-0.7%, Mg 0.8-1.0%, Mn < 0.15%, Fe < 0.3%, Zn < 0.25%, Ti < 0.15%, and the balance being Al. Melt the weighed high-precision aluminum ingots, aluminum-magnesium master alloys, and aluminum-silicon master alloys to obtain an aluminum alloy solution.

[0006] Step 2: Cast the aluminum alloy solution obtained in Step 1 to obtain aluminum alloy ingots;

[0007] Step 3: Heat the aluminum alloy ingot obtained in Step 2 to 530-560℃ and hold it at 530-560℃ for 9-10 hours. Then, switch to a constant temperature of 470-490℃ and continue to hold it for 1-2 hours to obtain the heated aluminum alloy ingot.

[0008] Step 4: The heated aluminum alloy ingot obtained in Step 3 is hot-rolled to obtain a hot-rolled semi-finished product; the hot-rolled semi-finished product is then cold-rolled with a processing rate of 22% to 32% to obtain a cold-rolled semi-finished product.

[0009] Step 5: Place the cold-rolled semi-finished product obtained in Step 4 into an air cushion furnace and air quench it at a temperature of 570-590℃. Then stretch it to obtain a stretched strip with a stretching rate of 2.8-3.0%.

[0010] Step Six: Place the stretched strip from Step Five into a heat treatment furnace. When the metal temperature is measured to be 150-180℃, increase the temperature to 160-190℃ and hold at 160-190℃ for 10-12 hours. After the holding period, remove the strip from the furnace and air cool to obtain aluminum alloy strip for 3C product cover plates.

[0011] The beneficial effects of this invention are:

[0012] This invention incorporates high-precision aluminum ingots containing 0.5-0.7% Si and 0.8-1.0% Mg, and employs air quenching in an air cushion furnace. By combining this with corresponding artificial aging processes, the air quenching production process for finished products was determined. This ensures precise control of parameters at each stage of production, achieving stable product quality in large-scale industrial production with relatively low production control difficulty. The air quenching process guarantees a smooth surface and flat shape of the aluminum strip, exhibiting good bending performance, and producing products that meet user requirements. The tensile strength of the aluminum alloy strip for 3C product cover plates obtained by this invention is 330-340 N / mm². 2 The yield strength is 290–305 N / mm. 2 With an elongation of 12-13%, it does not crack when bent at 90°, has a smooth surface, and an unevenness of <3mm, meeting the national standard GB / T3880-2012. It solves the problem of unstable product surface, flatness, and bending performance of aluminum alloy strips for 3C product cover plates prepared by existing methods during use.

[0013] This invention provides a method for preparing aluminum alloy strip for cover plates of 3C products. Attached Figure Description

[0014] Figure 1 This is a product drawing of the aluminum alloy strip used for the cover plate of 3C products in Example 1;

[0015] Figure 2 This is a high-magnification microstructure photograph of the strip after cold rolling to the finished thickness in Example 1;

[0016] Figure 3 This is a high-magnification tissue photograph of the strip after artificial aging in Example 1. Detailed Implementation

[0017] Specific Implementation Method 1: This implementation method describes a method for preparing aluminum alloy strip for 3C product cover plates, comprising the following steps: high-precision aluminum ingot 99%...

[0018] Step 1: Weigh out high-precision aluminum ingots, aluminum-magnesium master alloys, and aluminum-silicon master alloys according to the following mass fractions: Si 0.5-0.7%, Mg 0.8-1.0%, Mn < 0.15%, Fe < 0.3%, Zn < 0.25%, Ti < 0.15%, and the balance being Al. Melt the weighed high-precision aluminum ingots, aluminum-magnesium master alloys, and aluminum-silicon master alloys to obtain an aluminum alloy solution.

[0019] Step 2: Cast the aluminum alloy solution obtained in Step 1 to obtain aluminum alloy ingots;

[0020] Step 3: Heat the aluminum alloy ingot obtained in Step 2 to 530-560℃ and hold it at 530-560℃ for 9-10 hours. Then, switch to a constant temperature of 470-490℃ and continue to hold it for 1-2 hours to obtain the heated aluminum alloy ingot.

[0021] Step 4: The heated aluminum alloy ingot obtained in Step 3 is hot-rolled to obtain a hot-rolled semi-finished product; the hot-rolled semi-finished product is then cold-rolled with a processing rate of 22% to 32% to obtain a cold-rolled semi-finished product.

[0022] Step 5: Place the cold-rolled semi-finished product obtained in Step 4 into an air cushion furnace and air quench it at a temperature of 570-590℃. Then stretch it to obtain a stretched strip with a stretching rate of 2.8-3.0%.

[0023] The air quenching mentioned above refers to cooling down the temperature by air after quenching;

[0024] Step Six: Place the stretched strip from Step Five into a heat treatment furnace. When the metal temperature is measured to be 150-180℃, increase the temperature to 160-190℃ and hold at 160-190℃ for 10-12 hours. After the holding period, remove the strip from the furnace and air cool to obtain aluminum alloy strip for 3C product cover plates.

[0025] The beneficial effects of this implementation method are:

[0026] This embodiment incorporates high-precision aluminum ingots containing 0.5–0.7% Si and 0.8–1.0% Mg, and employs air quenching in an air cushion furnace. By exploring and matching this with a corresponding artificial aging process, the air quenching production process for the finished product was determined. This ensures precise control of parameters at each stage of production, achieving stable product quality in large-scale industrial production with relatively low production control difficulty. The air quenching process guarantees a smooth surface and flat shape of the aluminum strip, exhibiting good bending performance, and producing products that meet user requirements. The tensile strength of the aluminum alloy strip for 3C product cover plates obtained in this embodiment is 330–340 N / mm². 2 The yield strength is 290–305 N / mm. 2With an elongation of 12-13%, it does not crack when bent at 90°, has a smooth surface, and an unevenness of <3mm, meeting the national standard GB / T 3880-2012. This solves the problem of unstable product surface, flatness, and bending performance of aluminum alloy strips for 3C product covers prepared by existing methods during use.

[0027] Specific Implementation Method Two: The difference between this implementation method and Specific Implementation Method One is that in step one, the weighed high-precision aluminum ingots, aluminum-magnesium master alloys and aluminum-silicon master alloys are smelted under the following conditions: smelting temperature of 660-700℃, smelting rate of 45-50mm / min, casting cooling water pressure of 0.03-0.08Mpa and cooling water temperature of 20-30℃.

[0028] The other steps are the same as in Specific Implementation Method 1.

[0029] Specific Implementation Method 3: The difference between this implementation method and Specific Implementation Method 1 or 2 is that the purity of the high-precision aluminum ingot is above 90%.

[0030] The other steps are the same as in specific implementation method one or two.

[0031] Specific Implementation Method Four: The difference between this implementation method and Specific Implementation Methods One to Three is that in step two, the aluminum alloy solution is cast under the following conditions: casting temperature of 680℃~710℃, casting speed of 50~55mm / min, casting cooling water pressure of 0.03~0.1Mpa, and cooling water temperature of 20℃~26℃.

[0032] The other steps are the same as those in Specific Implementation Methods One to Three.

[0033] Specific Implementation Method 5: The difference between this implementation method and Specific Implementation Methods 1 to 4 is that in step 4, the heated aluminum alloy ingot is hot-rolled to a thickness of 4.0 to 7.0 mm.

[0034] The other steps are the same as those in Specific Implementation Methods One through Four.

[0035] Specific Implementation Method Six: The difference between this implementation method and Specific Implementation Methods One to Five is that the cold rolling processing rate in step four is 25% to 32%.

[0036] The other steps are the same as those in Specific Implementation Methods 1 to 5.

[0037] Specific Implementation Method Seven: The difference between this implementation method and Specific Implementation Methods One to Six is ​​that the stretching speed in step five is 8 to 10 m / min.

[0038] The other steps are the same as those in Specific Implementation Methods 1 to 6.

[0039] Specific Implementation Method Eight: The difference between this implementation method and Specific Implementation Methods One to Seven is that during the air quenching process in step five, the air cooling pressure is 2 to 10 bar.

[0040] The other steps are the same as those in Specific Implementation Methods 1 to 7.

[0041] Specific Implementation Method Nine: The difference between this implementation method and Specific Implementation Methods One to Eight is that the air-cooled air pressure is 5 to 6 bar.

[0042] The other steps are the same as those in Specific Implementation Methods 1 to 8.

[0043] Specific Implementation Method 10: The difference between this implementation method and Specific Implementation Methods 1 to 9 is that in step 6, after the stretched strip is placed into the heat treatment furnace, the furnace gas temperature is set to 180-240℃.

[0044] The other steps are the same as those in Specific Implementation Methods 1 to 9.

[0045] The beneficial effects of the present invention are verified using the following embodiments:

[0046] Example 1: A method for preparing aluminum alloy strip for 3C product cover plates, comprising the following steps:

[0047] Step 1: Weigh out high-precision aluminum ingots, aluminum-magnesium master alloys, and aluminum-silicon master alloys according to the following mass fractions: Si < 0.6%, Mg < 1.0%, Mn < 0.15%, Fe < 0.3%, Zn < 0.25%, Ti < 0.15%, and the balance being Al. Melt the weighed high-precision aluminum ingots, aluminum-magnesium master alloys, and aluminum-silicon master alloys at a melting temperature of 670℃, a melting rate of 47mm / min, a casting cooling water pressure of 0.05MPa, and a cooling water temperature of 24℃ to obtain an aluminum alloy solution. The purity of the high-precision aluminum ingots is above 90%.

[0048] Step 2: The aluminum alloy solution obtained in Step 1 is cast at a casting temperature of 685℃, a casting speed of 52mm / min, a casting cooling water pressure of 0.05Mpa, and a cooling water temperature of 22℃ to obtain an aluminum alloy ingot.

[0049] Step 3: Heat the aluminum alloy ingot obtained in Step 2 to 530℃ and hold it at 530℃ for 9 hours. Then, switch to a constant temperature of 470℃ and hold it for another hour to obtain the heated aluminum alloy ingot.

[0050] Step 4: The heated aluminum alloy ingot obtained in Step 3 is hot-rolled to a thickness of 4.0 mm to obtain a hot-rolled semi-finished product; the hot-rolled semi-finished product is then rolled in a cold rolling mill with a processing rate of 25% to 32% to obtain a cold-rolled semi-finished product.

[0051] Step 5: Place the cold-rolled semi-finished product obtained in Step 4 into an air cushion furnace and air quench it at a temperature of 575℃ with an air cooling pressure of 6 bar; then stretch it to obtain a stretched strip at a stretching speed of 8 m / min and a stretching rate of 2.8%.

[0052] Step Six: Place the stretched strip from Step Five into a heat treatment furnace, set the furnace gas temperature to 200℃, and when the metal temperature is measured to be 170℃, increase the temperature to 180℃ and hold at 180℃ for 12 hours. After the holding period, remove the strip from the furnace and air cool to obtain aluminum alloy strip for 3C product cover plates.

[0053] Upon testing, the tensile strength of the aluminum alloy strip for 3C product cover plates prepared in this embodiment is 330–340 N / mm². 2 The yield strength is 290–305 N / mm. 2 It has an elongation of 12-13%, does not crack when bent at 90°, meets the national standard GB / T 3880-2012, has a smooth surface, and has an unevenness of <3mm.

[0054] Figure 1 This is a product drawing of the aluminum alloy strip used for the cover plate of 3C products in Example 1; as shown. Figure 1 As shown, the aluminum alloy strip for 3C product cover plates prepared in this embodiment has a smooth surface, flat shape, and good bending performance, which fully meets the user's requirements.

[0055] Figure 2 This is a high-magnification microstructure photograph of the strip after cold rolling to the finished thickness in Example 1; as shown. Figure 2 As shown, the grains are clearly fibrous, proving that the coarse structure is completely broken down after hot rolling, which can effectively improve the strength of the final strip product.

[0056] Figure 3 This is a high-magnification tissue photograph of the strip after artificial aging in Example 1; such as Figure 3 As shown, the grains are fine and uniform, which can effectively improve the bending performance of the final strip product.

Claims

1. A method for preparing aluminum alloy strip for cover plates of 3C products, characterized in that... The preparation method is carried out according to the following steps: Step 1: Weigh out high-precision aluminum ingots, aluminum-magnesium master alloys, and aluminum-silicon master alloys according to the following mass fractions: Si 0.5~0.7%, Mg 0.8~1.0%, Mn <0.15%, Fe <0.3%, Zn <0.25%, Ti <0.15%, and the balance being Al. Melt the weighed high-precision aluminum ingots, aluminum-magnesium master alloys, and aluminum-silicon master alloys to obtain an aluminum alloy solution. Step 2: Cast the aluminum alloy solution obtained in Step 1 to obtain aluminum alloy ingots; Step 3: Heat the aluminum alloy ingot obtained in Step 2 to 530~560℃ and hold it at 530~560℃ for 9~10 hours. Then, switch to a constant temperature of 470~490℃ and continue to hold it for 1~2 hours to obtain the heated aluminum alloy ingot. Step 4: The heated aluminum alloy ingot obtained in Step 3 is hot-rolled to obtain a hot-rolled semi-finished product; the hot-rolled semi-finished product is then cold-rolled with a processing rate of 25%~32% to obtain a cold-rolled semi-finished product. In step four, the heated aluminum alloy ingot is hot-rolled to a thickness of 4.0~7.0mm; Step 5: Place the cold-rolled semi-finished product obtained in Step 4 into an air cushion furnace and air quench it at a temperature of 570~590℃. Then, stretch it to obtain a stretched strip at a stretching speed of 8~10m / min and a stretching rate of 2.8~3.0%. During step five, the air cooling pressure is 2~10 bar. Step 6: Place the stretched strip from Step 5 into a heat treatment furnace. When the metal temperature is measured to be 150~180℃, increase the temperature to 160~190℃ and hold at 160~190℃ for 10~12 hours. After the holding period, remove the strip from the furnace and air cool to obtain aluminum alloy strip for 3C product cover plates.

2. The method for preparing an aluminum alloy strip for a 3C product cover plate according to claim 1, characterized in that... In step one, the weighed high-precision aluminum ingots, aluminum-magnesium master alloys and aluminum-silicon master alloys are smelted under the following conditions: smelting temperature of 660~700℃, smelting rate of 45~50mm / min, casting cooling water pressure of 0.03~0.08Mpa and cooling water temperature of 20~30℃.

3. A method for preparing aluminum alloy strip for 3C product cover plates according to claim 1 or 2, characterized in that... The purity of the high-precision aluminum ingot is above 90%.

4. The method for preparing an aluminum alloy strip for a 3C product cover plate according to claim 1, characterized in that... In step two, the aluminum alloy solution is cast under the following conditions: casting temperature of 680℃~710℃, casting speed of 50~55mm / min, casting cooling water pressure of 0.03~0.1Mpa, and cooling water temperature of 20℃~26℃.

5. The method for preparing an aluminum alloy strip for a 3C product cover plate according to claim 1, characterized in that... The air pressure for air cooling is 5~6 bar.

6. The method for preparing an aluminum alloy strip for a 3C product cover plate according to claim 1, characterized in that... In step six, after placing the stretched strip into the heat treatment furnace, the furnace gas temperature is set to 180~240℃.

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