Production method of 5052 aluminum alloy cold-rolled coiled material

Abstract

The invention discloses a 5052 aluminum alloy cold-rolled coiled material production method, and relates to the technical field of aluminum alloy coiled material preparation. The specific production technological process comprises the steps of smelting, hot continuous rolling, cold rolling cogging, cold rolling finished product rolling, cleaning, annealing and withdrawal and straightening. The hot continuous rolling is that the 5052 alloy cast ingot is subjected to hot continuous rolling to 2.0-3.0 mm; the roughness Ra of a roller used for cold rolling cogging is 1.5-2.5 microns, and the roughness Rz of the roller used for cold rolling cogging is 4.5-7.0 microns; the rolling speed is 50-150mpm, and the rolling oil transmittance is greater than or equal to 98%; the roughness Ra of a roller used for rolling the cold-rolled finished product is less than or equal to 0.3 mu m, the rolling machining rate is more than or equal to 50%, and the rolling pass is more than or equal to 2. The problems of surface chromatic aberration and black strips caused by surface lubrication when the thickness of a hot-rolled blank is reduced to be smaller than or equal to 3.0 mm are solved, compared with an original continuous casting and rolling method, the product produced through the production technology is free of cracks, chromatic aberration and black strips on the surface, the requirement for the surface quality of the 5052 aluminum alloy strip is met, the production cost is low, and the production technology is suitable for industrial production.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum alloy coil preparation, and in particular to a production method of a 5052 aluminum alloy cold-rolled coil. Background Art

[0002] 5052 aluminum alloy is the most widely used rust-proof aluminum. This alloy has high strength, especially fatigue resistance: high plasticity and corrosion resistance, cannot be strengthened by heat treatment, good plasticity during semi-cold hardening, low plasticity during cold hardening, good corrosion resistance, good weldability, poor machinability, and can be polished. 5052 aluminum alloy strip is mainly used in chassis cabinets, mobile phone digital product parts, instruments and meters, etc., and has extremely high surface quality requirements.

[0003] At present, the production methods of aluminum alloy thin strips are as follows: 1. Casting and rolling method, which is limited by the rolling force and cooling capacity of the casting roll, can only be used to produce 1 series, 3 series and 8 series aluminum alloys. When producing 5052 aluminum alloy cast-rolled billets, surface cracks are prone to occur, and the billet thickness is relatively thick. The cracks will rapidly increase during subsequent cold rolling, resulting in broken strips; 2. Hot rolling method, the production process is: melting-casting-sawing-milling-heating-hot rolling to 5-6mm-cold rolling-cleaning-annealing-stretching and straightening. It is currently the only production method that can stably produce 5052 alloy thin strips, but the production process is long, the yield is low, and the production cost is high. The current cost reduction method is to reduce the thickness of the hot-rolled billet and then reduce the number of cold rolling passes. When the thickness of the hot-rolled billet is reduced to ≤3.0mm, it is extremely easy to produce defects such as color difference and black strips due to surface lubrication problems.

[0004] The method to improve the color difference and black stripe defects on the surface of hot-rolled billets is generally to adjust the hot-rolling rolling pass distribution, rolling speed, emulsion ratio, brush roller speed / pressure, etc., but the hot rolling mill needs to continuously produce thick, thin, wide, narrow, hard, and soft materials. It is difficult to select a set of rolling process parameters that take into account various materials, and it is difficult to stably control the surface quality for the equipment limit specifications. The method to eliminate the color difference and black stripe defects on the surface of hot-rolled billets: The cold-rolled finished pass adopts EDT roller rolling to eliminate surface defects, but the surface roughness after EDT roller rolling is large, and there is a lot of aluminum powder. The aluminum ash can only be cleaned after acid and alkali washing. At present, it can only be applied to aluminum alloy plates and strips for anodizing, and it is not applicable to products using the original surface of aluminum plates and strips.

[0005] CN 111270113 A A production process of 5052 aluminum alloy sheet with low earing rate. The patent is a hot rolling method, and its production process is: melting - casting - sawing - milling - heating - hot rolling - cold rolling 1 - annealing 1 - cold rolling 2 - annealing 2 - straightening. Its production process is long and the production cost is high.

[0006] CN201911316096.1 A method for producing 5052 aluminum alloy discs for rice cooker pot core. This patent is a hot rolling method. The hot rolled billet thickness is 10-11 mm, and the subsequent cold rolling to 1.0 mm requires 6-7 passes.

[0007] Based on the above problems, the purpose of this application is to provide a method for producing 5052 aluminum alloy cold-rolled coil.

[0008] CN202410815637.X Preparation method of anodized aluminum strip with recycled aluminum for laptop shell This patent is a method for producing anodized aluminum strip. The finished product is rolled with EDT roughening Ra 0.90-1.10μm. The surface roughness after rolling is large, and there is a lot of aluminum powder. It needs to be pickled before the aluminum ash can be cleaned. It is not applicable to products using the original surface of aluminum strips. In addition, the thickness of the hot-rolled billet is 7.0-10.0mm, and the subsequent cold rolling passes are many, and the processing cost is high. Summary of the invention

[0009] In view of the above shortcomings, the present invention provides a 5052 aluminum alloy cold-rolled coil production method, which solves the problem of surface color difference and black stripes caused by surface lubrication when the thickness of the hot-rolled billet is reduced to ≤3.0 mm. The specific technical solution is as follows:

[0010] A method for producing a 5052 aluminum alloy cold-rolled coil, the production process of which is: smelting - hot rolling - cold rolling for blanking - cold rolling for finished product rolling - cleaning - annealing - straightening;

[0011] The hot rolling is to hot-roll the 5052 alloy ingot to 2.0-3.0 mm;

[0012] The roughness of the rolling roll used for the cold rolling is Ra1.5-2.5μm, Rz4.5-7.0μm; the rolling speed is 50-150mpm, and the rolling oil permeability is ≥98%;

[0013] The roughness of the roll used for rolling the cold-rolled finished product is Ra≤0.3 μm, the rolling processing rate is ≥50%, and the number of rolling passes is ≥2. The roll used for rolling the cold-rolled finished product is a roll ground by a conventional roll grinder.

[0014] Furthermore, the rolling roller used for the cold rolling is an EDT rolling roller with a roughness of Ra1.5-2.5μm.

[0015] Furthermore, the rolling processing rate of the cold-rolled blank is ≥30%.

[0016] Furthermore, the rolling speed of the cold rolling is 70-100 mpm.

[0017] Furthermore, the surface roughness of the aluminum coil after cold rolling is Ra≥1.0 μm.

[0018] Furthermore, the rolling processing rate of the cold-rolled finished product is 65%.

[0019] Furthermore, the surface roughness of the cold-rolled aluminum coil after rolling is Ra≤0.35 μm.

[0020] Furthermore, the cold-rolled finished product is rolled 3-4 times.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention adopts high roughness and increases the processing rate for slab rolling, which can eliminate the color difference and black stripes on the surface of the hot-rolled slab when the thickness of the hot-rolled slab is reduced to ≤3.0mm; at the same time, slow rolling is adopted during cold rolling of the slab while increasing the rolling oil permeability, which can reduce the aluminum powder residue on the surface of the aluminum coil. In addition, the present invention uses a roller with a roughness Ra≤0.3μm during cold rolling of the finished product, which can prevent the surface of the aluminum coil from turning white, and adopts a rolling process with a rolling processing rate of ≥50% to restore the surface of the aluminum coil to the normal rolling surface of the aluminum alloy strip. Compared with the original continuous casting and rolling method, the product surface produced by the production process of the present invention has no cracks, no color difference, and no black stripes, meets the surface quality requirements of 5052 aluminum alloy strips, and has low production costs and is suitable for industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below.

[0024] Figure 1 A 5052 aluminum alloy cold-rolled coil is prepared in Example 1;

[0025] Figure 2 A 5052 aluminum alloy cold-rolled coil is prepared in Example 2;

[0026] Figure 3 A 5052 aluminum alloy cold-rolled coil was prepared as Comparative Example 1;

[0027] Figure 4 A 5052 aluminum alloy cold-rolled coil was prepared for Comparative Example 2;

[0028] Figure 5 A 5052 aluminum alloy cold-rolled coil was prepared for Comparative Example 4. DETAILED DESCRIPTION

[0029] The specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0030] Example 1

[0031] The production process of 5052 aluminum alloy cold-rolled coil in this embodiment is: smelting-hot rolling-cold rolling blanking-cold rolling finished product rolling-cleaning-annealing-stretching and straightening. The hot rolling is to hot-roll the 5052 alloy ingot to 3.0mm. The roughness of the EDT roller used for the cold rolling blanking is Ra1.5μm, Rz4.5μm, the rolling processing rate is 30%, the rolling speed is 50mpm, the rolling oil permeability is 98%, the cold rolling blanking pass thickness changes from 3.0mm to 2.0mm, and the surface roughness of the aluminum coil after rolling is Ra1.0μm. The roughness of the roller used for the cold rolling finished product rolling is Ra0.3μm, the rolling processing rate is 50%, the rolling passes are 3 times, the cold rolling rolling thickness changes from 2.0mm to 1.35mm to 1.0mm, and the surface roughness of the aluminum coil after rolling is Ra0.35μm. The 5052 cold rolled coil rolled to a thickness of 1.0 mm is cleaned, annealed and straightened to produce the finished product.

[0032] The 5052 aluminum alloy cold-rolled coil prepared in this embodiment has no cracks, no color difference, no black stripes on the surface, and has uniform color, meeting the surface quality requirements of 5052 aluminum alloy strips. Figure 1 .

[0033] Example 2

[0034] The production process of 5052 aluminum alloy cold-rolled coil in this embodiment is: smelting-hot rolling-cold rolling blanking-cold rolling finished product rolling-cleaning-annealing-stretching and straightening. The hot rolling is to hot-roll the 5052 alloy ingot to 2.0mm. The roughness of the EDT roller used for the cold rolling blanking is Ra2.5μm, Rz7.0μm, the rolling processing rate is 350%, the rolling speed is 150mpm, the rolling oil permeability is 99%, the thickness of the cold rolling blanking pass changes from 2.0mm to 1.4mm, and the surface roughness of the aluminum coil after rolling is Ra1.5μm. The roughness of the roller used for the cold rolling finished product rolling is Ra0.25μm, the rolling processing rate is 60%, the rolling passes are 3 times, the cold rolling thickness changes from 1.4mm to 0.85mm to 0.5mm, and the surface roughness of the aluminum coil after rolling is Ra0.3μm. The 5052 cold rolled coil rolled to a thickness of 0.5 mm is cleaned, annealed and straightened to produce the finished product.

[0035] The 5052 aluminum alloy cold-rolled coil prepared in this embodiment has no cracks, no color difference, and no black strips on the surface, meeting the surface quality requirements of 5052 aluminum alloy strips. Figure 2 .

[0036] Example 3

[0037] The production process of 5052 aluminum alloy cold-rolled coil in this embodiment is: smelting-hot rolling-cold rolling blanking-cold rolling finished product rolling-cleaning-annealing-stretching and straightening. The hot rolling is to hot-roll the 5052 alloy ingot to 2.0mm. The roughness of the EDT roller used for the cold rolling blanking is Ra2.0μm, Rz5.5μm, the rolling processing rate is 40%, the rolling speed is 100mpm, the rolling oil permeability is 98%, the thickness of the cold rolling blanking pass changes from 2.0mm to 1.25mm, and the surface roughness of the aluminum coil after rolling is Ra2.0μm. The roughness of the roller used for the cold rolling finished product rolling is Ra0.25μm, the rolling processing rate is 65%, the rolling passes are 4 times, the cold rolling thickness changes from 1.25mm-0.68mm-0.38mm-0.2mm, and the surface roughness of the aluminum coil after rolling is Ra0.30μm. The 5052 cold rolled coil rolled to a thickness of 0.2 mm is cleaned, annealed and straightened to produce the finished product.

[0038] The 5052 aluminum alloy cold-rolled coil prepared in this embodiment has no cracks, no color difference, and no black stripes on the surface, meeting the surface quality requirements of the 5052 aluminum alloy strip.

[0039] Example 4

[0040] The production process of the 5052 aluminum alloy cold-rolled coil in this embodiment is: smelting-hot rolling-cold rolling blanking-cold rolling finished product rolling-cleaning-annealing-stretching and straightening. The hot rolling is to hot-roll the 5052 alloy ingot to 2.0mm. The roughness of the EDT roller used for the cold rolling blanking is Ra2.5μm, Rz4.5μm, the rolling processing rate is 50%, the rolling speed is 70mpm, the rolling oil permeability is 99%, the cold rolling blanking pass thickness changes from 2.0mm to 1.25mm, and the surface roughness of the aluminum coil after rolling is Ra1.0μm. The roughness of the roller used for the cold rolling finished product rolling is Ra0.30μm, the rolling processing rate is 60%, the rolling passes are 4 times, the cold rolling rolling thickness changes from 1.25mm-0.68mm-0.38mm-0.2mm, and the surface roughness of the aluminum coil after rolling is Ra0.30μm. The 5052 cold rolled coil rolled to a thickness of 0.2 mm is cleaned, annealed and straightened to produce the finished product.

[0041] The 5052 aluminum alloy cold-rolled coil prepared in this embodiment has no cracks, no color difference, and no black stripes on the surface, meeting the surface quality requirements of the 5052 aluminum alloy strip.

[0042] Comparative Example 1

[0043] In this comparative example, except that the cold rolling pass was rolled with EDT rollers, the other processes and parameters were the same as those in Example 1. The surface of the 5052 aluminum alloy cold-rolled coil prepared in this comparative example had a lot of aluminum ash residue, which could not be cleaned with ordinary water, and aluminum ash lines were easily generated (see Figure 3), it needs to be pickled to be cleaned, but the surface of the aluminum alloy coil will turn white after pickling, which cannot meet the surface quality requirements of 5052 aluminum alloy strip.

[0044] Comparative Example 2

[0045] The roughness of the rolls used in the cold rolling of this comparative example is Ra0.6μm, Rz0.5μm, the rolling processing rate is 25%, and the other processes and parameters are the same as those in Example 1. The surface of the 5052 aluminum alloy cold-rolled coil prepared in this comparative example has black stripes (see Figure 4 ), which cannot meet the surface quality requirements of 5052 aluminum alloy strip.

[0046] Comparative Example 3

[0047] The comparative example is hot-rolled to 7.0 mm, the finished product thickness is 0.5 mm, the roughness of the roll used for cold rolling is Ra0.45 μm, the rolling pass processing rate is 40%, the cold rolling passes are 7.0-4.2-2.5-1.5-0.9-0.5 mm, and the other processes and parameters are the same as those in Example 2. The 5052 aluminum alloy cold-rolled coil prepared in this comparative example has many rolling passes, high production cost and low production efficiency.

[0048] Comparative Example 4

[0049] The roughness of the roll used in the cold rolling of this comparative example is Ra0.45μm, the rolling processing rate is 40%, and the other processes and parameters are the same as those in Example 1. The surface color difference of the 5052 aluminum alloy cold-rolled coil prepared in this comparative example is serious (see Figure 5 ), which cannot meet the surface quality requirements of 5052 aluminum alloy strip.

[0050] In summary, the present invention adopts high roughness and increases the processing rate for blank rolling, which can eliminate the color difference and black stripes on the surface of the hot-rolled blank when the thickness of the hot-rolled blank is reduced to ≤3.0mm; at the same time, slow rolling is adopted during cold rolling of blanks while increasing the rolling oil permeability, which can reduce the residual aluminum powder on the surface of the aluminum coil. In addition, the present invention uses a roller with a roughness Ra≤0.3μm during cold rolling of finished products, which can prevent the surface of the aluminum coil from turning white, and adopts a rolling process with a rolling processing rate of ≥50% to restore the surface of the aluminum coil to the normal rolling surface of the aluminum alloy strip. Compared with the original continuous casting and rolling method, the product produced by the production process of the present invention has no cracks, no color difference, and no black stripes on the surface, meets the surface quality requirements of 5052 aluminum alloy strips, and has low production costs and is suitable for industrial production.

[0051] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A method for producing 5052 aluminum alloy cold-rolled coil, characterized in that: The production process is as follows: smelting - hot rolling - cold rolling - cold rolling - finished product rolling - cleaning - annealing - straightening; The hot rolling is to hot-roll the 5052 alloy ingot to 2.0-3.0 mm; The roughness of the rolling roll used for the cold rolling is Ra1.5-2.5μm, Rz4.5-7.0μm; the rolling speed is 50-150mpm, and the rolling oil permeability is ≥98%; The roughness of the rolling roller used for rolling the cold-rolled finished product is Ra≤0.3 μm, the rolling processing rate is ≥50%, and the rolling passes are ≥2.

2. The method for producing a 5052 aluminum alloy cold-rolled coil according to claim 1, characterized in that: The rolling roller used for the cold rolling is an EDT rolling roller with a roughness of Ra1.5-2.5μm.

3. The method for producing a 5052 aluminum alloy cold-rolled coil according to claim 1, characterized in that: The rolling processing rate of the cold-rolled blank is ≥30%.

4. The method for producing a 5052 aluminum alloy cold-rolled coil according to claim 1, characterized in that: The rolling speed of the cold rolling is 70-100 mpm.

5. The method for producing a 5052 aluminum alloy cold-rolled coil according to claim 1, characterized in that: The surface roughness of the aluminum coil after cold rolling is Ra≥1.0 μm.

6. The method for producing a 5052 aluminum alloy cold-rolled coil according to claim 1, characterized in that: The rolling processing rate of the cold-rolled finished product rolling is 65%.

7. The method for producing a 5052 aluminum alloy cold-rolled coil according to claim 1, characterized in that: The surface roughness of the cold-rolled aluminum coil after rolling is Ra≤0.35 μm.

8. The method for producing a 5052 aluminum alloy cold-rolled coil according to claim 1, characterized in that: The cold-rolled finished product is rolled 3-4 times.

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