Rolling method of 5-series aluminum alloy can cover material

Abstract

The invention relates to the technical field of aluminum alloy processing and manufacturing, in particular to a rolling method of a 5-series aluminum alloy can cover material, which comprises the following steps: burdening, smelting, refining, filtering, casting, sawing and milling, heating, hot rolling, cold rolling, cleaning, trimming, straightening and packaging. The hot rolling conditions comprise that hot rough rolling is firstly carried out, the hot rough rolling is carried out for 19-21 passes, then five-rack hot continuous rolling is carried out until the thickness of a hot-rolled product is 2.1-2.3 mm, and the finish rolling temperature is 315-335 DEG C; the cold rolling conditions comprise that the temperature is reduced to 20-30 DEG C, cold rolling triple continuous rolling is carried out, and the thickness of a cold-rolled product is 0.2-0.25 mm. The rolling method is high in yield, high in rolling efficiency and stable in finished product quality.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum alloy processing and manufacturing, and specifically relates to a rolling method for 5 series aluminum alloy can cover materials. Background Art

[0002] 5 series aluminum alloy is often used as the preferred material for easy-open lids for food and beverage packaging due to its moderate strength and easy processing and forming. At present, the cold rolling process of aluminum alloy strips for 5 series can lids in the industry requires 4-5 passes, which has a long cycle, high cost and low efficiency, and cannot meet the needs of fierce market competition.

[0003] In summary, there is an urgent need for a rolling method for 5 series aluminum alloy can cover materials with high yield rate and stable finished product quality. Summary of the invention

[0004] The invention aims to solve the technical problem that a rolling method for 5 series aluminum alloy can cover material has a high yield rate but unstable quality of the finished product.

[0005] In order to achieve the above-mentioned object, the first aspect of the present invention provides a rolling method for 5 series aluminum alloy can cover material, wherein the rolling method comprises: batching, smelting, refining, filtering, casting, sawing and milling, heating, hot rolling, cold rolling, cleaning, trimming, straightening, and packaging;

[0006] The hot rolling conditions include: firstly hot rough rolling, the hot rough rolling is 19-21 passes, then five-stand hot continuous rolling is carried out until the hot rolled product thickness is 2.1-2.3mm, and the final rolling temperature is 315-335℃;

[0007] The cold rolling conditions include: cooling to 20-30°C, performing three consecutive cold rolling, and the thickness of the cold rolled product is 0.2-0.25mm.

[0008] A second aspect of the present invention provides an aluminum alloy can cover material produced by the above rolling method.

[0009] Beneficial effects: The rolling method disclosed by the invention has high yield rate, high rolling efficiency and stable finished product quality. DETAILED DESCRIPTION

[0010] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0011] The existing technology for preparing 5 series aluminum alloy can cover materials requires 5-6 cold rolling passes, which has a long cycle, high cost, low efficiency and a large amount of waste.

[0012] In the present invention, the inventors found that if the hot rolling and cold rolling processes are optimized, the rolling method of 5 series aluminum alloy can cover materials can have a high yield rate, high rolling efficiency, and stable finished product quality.

[0013] To this end, the first aspect of the present invention provides a rolling method for 5 series aluminum alloy can cover materials, wherein the rolling method comprises: batching, smelting, refining, filtering, casting, sawing and milling, heating, hot rolling, cold rolling, cleaning, trimming, straightening, and packaging;

[0014] The hot rolling conditions include: firstly hot rough rolling, the hot rough rolling is 19-21 passes, then five-stand hot continuous rolling is carried out until the hot rolled product thickness is 2.1-2.3mm, and the final rolling temperature is 315-335℃;

[0015] The cold rolling conditions include: cooling to 20-30°C, performing three consecutive cold rolling, and the thickness of the cold rolled product is 0.2-0.25mm.

[0016] In the present invention, the rolling method is optimized, the production efficiency of 5 series alloy can cover materials is improved, the amount of rolling waste in one or two passes is saved, the yield is improved, the production cost is reduced, and the metal circulation is accelerated.

[0017] Further, the alloy state of the aluminum alloy can material is 5 series-H19.

[0018] According to the present invention, the cold rolling conditions also include: the processing rates of the three-stand cold rolling are 55-57%, 52-55% and 43-47% respectively.

[0019] According to the present invention, the components and their weight percentages in the aluminum alloy can cover material are: Si content is 0.07-0.19%, Fe content is 0.30-0.36%, Cu content is ≤0.03%, Mn content is ≤0.03%, Mg content is 2.6-2.7%, Cr content is 0.2-0.3%, Zn content is ≤0.03%, Ti content is 0.015-0.025%, single impurity content is ≤0.05%, total impurity content is ≤0.15%, and the balance is Al.

[0020] According to the present invention, the smelting conditions include: the smelting temperature is 730-760°C.

[0021] According to the present invention, the refining conditions include: the refining temperature is 730-750°C.

[0022] According to the present invention, the filtration adopts plate-first CFF filtration.

[0023] In the present invention, the above filtering method can reduce the slag content of the melt and ensure the purity of the melt.

[0024] In the present invention, Al-5Ti-0.2B is used for online refinement treatment to ensure the grain size of the aluminum alloy ingot.

[0025] According to the present invention, the casting conditions include: the casting temperature is 680-687°C.

[0026] According to the present invention, the heating conditions include: heating time is 2-3h, and heating metal temperature is 500-510°C.

[0027] A second aspect of the present invention provides an aluminum alloy can cover material produced by the above rolling method.

[0028] Test Method

[0029] The tensile mechanical properties (tensile strength, specified non-proportional elongation strength, elongation after fracture) are measured according to GB / T 16865.

[0030] The technical scheme of the present invention is further described in detail below in conjunction with the embodiments. Obviously, the embodiments described herein are only some embodiments of the present invention and are not intended to limit the present invention. Based on the embodiments in the present invention, all other embodiments implemented by ordinary technicians in the field without making creative improvements belong to the protection scope of the present invention.

[0031] Example 1

[0032] In terms of mass fraction, the components of the 5182 aluminum alloy can cover material are: Si: 0.12%, Fe: 0.35%, Cu: 0.01%, Mn: 0.015%, Mg: 2.63%, Cr: 0.26%, Zn: 0.005%, Ti: 0.016%, individual impurities ≤ 0.05%, total ≤ 0.15%, and the balance is Al.

[0033] Melting temperature is 745℃, refining temperature is 740℃. Bipolar CFF filtration is used, and casting temperature is 685℃. The sawing amount of the sawing head in the sawing and milling surface is 310mm; the large surface milling amount is 12mm. The heating temperature of the flat ingot after sawing and milling is 500℃, and the holding time is 2 hours. First, hot rough rolling, hot rough rolling 21 times, and then hot continuous rolling on 5 stands to the finished product thickness of 2.2mm, and the final rolling temperature is 324℃. Cooling to 25℃, cold rolling three continuous rolling to the finished product thickness of 0.236mm, the cold rolling mill pass distribution and process parameters are shown in Table 1.

[0034] Table 1

[0035]

[0036] The rolled aluminum alloy coil is stretched, bent, straightened and cleaned, with an elongation of 0.6% and a cleaning temperature of 65° C. The cleaned and straightened aluminum alloy coil is cut into finished product specifications to obtain aluminum alloy can cover material A1.

[0037] Example 2

[0038] In terms of mass fraction, the components of the 5182 aluminum alloy can cover material are: Si: 0.15%, Fe: 0.34%, Cu: 0.013%, Mn: 0.02%, Mg: 2.66%, Cr: 0.28%, Zn: 0.008%, Ti: 0.018%, individual impurities ≤ 0.05%, total ≤ 0.15%, and the balance is Al.

[0039] Melting temperature is 748℃, refining temperature is 743℃. Bipolar CFF filtration is used, and casting temperature is 682℃. The sawing amount of the sawing head in the sawing and milling surface is 310mm; the large surface milling amount is 12mm. The heating temperature of the flat ingot after sawing and milling is 500℃, and the holding time is 3 hours. First, hot rough rolling, hot rough rolling 19 times, and then hot continuous rolling on 5 stands to the finished product thickness of 2.3mm, and the final rolling temperature is 330℃. Cooling to 25℃, cold rolling three continuous rolling to the finished product thickness of 0.248mm, the cold rolling mill pass distribution and process parameters are shown in Table 2.

[0040] Table 2

[0041]

[0042]

[0043] The rolled aluminum alloy coil is stretched, bent, straightened and cleaned, with an elongation of 0.6% and a cleaning temperature of 65° C. The cleaned and straightened aluminum alloy coil is cut into finished product specifications to obtain aluminum alloy can cover material A2.

[0044] Comparative Example 1

[0045] In terms of mass fraction, the components of the 5182 aluminum alloy can cover material are: Si: 0.16%, Fe: 0.32%, Cu: 0.02%, Mn: 0.013%, Mg: 2.64%, Cr: 0.25%, Zn: 0.006%, Ti: 0.02%, individual impurities ≤ 0.05%, total ≤ 0.15%, and the balance is Al.

[0046] Melting temperature is 745℃, refining temperature is 741℃. Bipolar CFF filtration is used, and casting temperature is 684℃. The sawing amount of the ingot head in the sawing and milling surface is 310mm; the large surface milling amount is 12mm. The heating temperature of the flat ingot after sawing and milling is 500℃, and the holding time is 2 hours. First, hot rough rolling, hot rough rolling 19 times, and then hot continuous rolling on 5 stands to the finished product thickness of 2.5mm, and the final rolling temperature is 325℃. Cold rolling single stand two passes rolling to a thickness of 0.67mm, cooling to below 60℃, and then rolling by a single stand two passes to a finished product thickness of 0.236mm. The cold rolling mill pass distribution and process parameters are shown in Table 3.

[0047] Table 3

[0048]

[0049] The rolled aluminum alloy coil is stretched, bent, straightened and cleaned, with an elongation of 0.6% and a cleaning temperature of 65°C; the cleaned and straightened aluminum alloy coil is cut into finished product specifications to obtain aluminum alloy can cover material DA1.

[0050] Comparative Example 2

[0051] In terms of mass fraction, the components of the 5182 aluminum alloy can cover material are: Si: 0.15%, Fe: 0.33%, Cu: 0.018%, Mn: 0.016%, Mg: 2.68%, Cr: 0.28%, Zn: 0.01%, Ti: 0.019%, individual impurities ≤ 0.05%, total ≤ 0.15%, and the balance is Al.

[0052] Melting temperature is 746℃, refining temperature is 743℃. Bipolar CFF filtration is used, and casting temperature is 686℃. The sawing amount of the ingot head in the sawing and milling surface is 310mm; the large surface milling amount is 12mm. The heating temperature of the flat ingot after sawing and milling is 500℃, and the holding time is 2 hours. First, hot rough rolling, hot rough rolling 19 times, and then hot continuous rolling on 5 stands to the finished product thickness of 2.5mm, and the final rolling temperature is 328℃. Cold rolling single stand two passes rolling to a thickness of 0.67mm, cooling to below 60℃, and then rolling by a single stand two passes to a finished product thickness of 0.248mm. The cold rolling mill pass distribution and process parameters are shown in Table 4.

[0053] Table 4

[0054]

[0055] The rolled aluminum alloy coil is stretched, bent, straightened and cleaned, with an elongation of 0.6% and a cleaning temperature of 65°C; the cleaned and straightened aluminum alloy coil is cut into finished product specifications to obtain aluminum alloy can cover material DA2.

[0056] The performance indicators and production indicators of A1-A2 and DA1-DA2 are shown in Table 5.

[0057] Table 5

[0058]

[0059] It can be seen from Table 5 above that the aluminum alloy can cover materials prepared in Example 1 and Example 2 have equivalent mechanical properties to those prepared in Comparative Example 1 and Comparative Example 2, and other indicators meet the requirements, the number of production passes is reduced, the efficiency is improved, and the production cost is reduced.

[0060] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A rolling method for 5 series aluminum alloy can cover material, characterized in that: The rolling method includes: batching, smelting, refining, filtering, casting, sawing and milling, heating, hot rolling, cold rolling, cleaning, trimming, straightening and packaging; The hot rolling conditions include: firstly hot rough rolling, the hot rough rolling is 19-21 passes, then five-stand hot continuous rolling is carried out until the hot rolled product thickness is 2.1-2.3mm, and the final rolling temperature is 315-335℃; The cold rolling conditions include: cooling to 20-30°C, performing three consecutive cold rolling, and the thickness of the cold rolled product is 0.2-0.25mm.

2. The rolling method according to claim 1, characterized in that: The cold rolling conditions also include: the processing rates of the three-stand cold rolling are 55-57%, 52-55% and 43-47% respectively.

3. The rolling method according to claim 1, characterized in that: The components and their weight percentages in the aluminum alloy can cover material are: Si content is 0.07-0.19%, Fe content is 0.30-0.36%, Cu content is ≤0.03%, Mn content is ≤0.03%, Mg content is 2.6-2.7%, Cr content is 0.2-0.3%, Zn content is ≤0.03%, Ti content is 0.015-0.025%, single impurity content is ≤0.05%, total impurity content is ≤0.15%, and the balance is Al.

4. The rolling method according to claim 1, characterized in that: The smelting conditions include: a smelting temperature of 730-760°C; The refining conditions include: the refining temperature is 730-750°C.

5. The rolling method according to claim 1, characterized in that: The filtration adopts plate-type CFF filtration.

6. The rolling method according to claim 1, characterized in that: The casting conditions include: the casting temperature is 680-687°C.

7. The rolling method according to claim 1, characterized in that: The heating conditions include: heating time of 2-3 hours, and heating metal temperature of 500-510°C.

8. Aluminum alloy can cover material obtained by the rolling method according to any one of claims 1 to 7.

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