A processing technology of 8011 aluminum alloy medicine foil

Abstract

The invention discloses a processing technology of 8011 aluminum alloy medicine foil, firstly smelting to obtain aluminum melt, controlling the iron mass content to be 0.75-0.78%, the silicon mass content to be 0.55-0.58%, and the titanium mass content to be 0.018-0.022%; the aluminum melt is refined and degassed by combining powder spray refining and particle refining, filtered, and the aluminum melt with a hydrogen content of ≤0.10mL / 100g is obtained; the casting and rolling machine is cast and rolled to obtain a cast-rolled plate blank with a thickness of 6.6-6.8mm; cold rolling and foil rolling, degreasing annealing, and the processing technology of the invention is suitable for the preparation of 1300-1500mm crack-free medicine foil, eliminating edge cracks, reducing the generation of cold rolling waste, reducing waste, and the medicine foil has good quality.

Description

Technical Field

[0001] The invention relates to a processing technology of 8011 aluminum alloy medicine foil, belonging to the technical field of aluminum alloy production. Background Art

[0002] Pharmaceutical foil is widely used in pharmaceutical packaging, and the market demand is very large. Usually, pharmaceutical foil can be used for pharmaceutical packaging after unwinding, corona treatment, gravure printing, drying, protective layer coating, drying, adhesive layer coating, drying, slitting, and winding. At present, the most commonly used method is to use 8011 aluminum alloy for pharmaceutical foil production, but the temperature resistance of pharmaceutical foil produced by 8011 aluminum alloy is poor. In the process of pharmaceutical foil processing, high-temperature drying is required to solidify the paint after printing. In this process, the tensile strength of the pharmaceutical foil is greatly reduced, and the quality requirements of the pharmaceutical foil are not met.

[0003] 8011 aluminum alloy belongs to the 8 series alloy. Usually, the 8 series alloy foil has high requirements for iron and silicon content, and is prone to large cracks during rolling.

[0004] The cracked edge has a certain impact on the strip breakage in the later rolling process. Before the edge trimming in the cold rolling process, the edge cracks are large, and there is a risk of strip breakage if the edge trimming is not clean; the cracked edge is not dense and it is easy to fall off, metal is pressed in, etc., which may cause certain damage to the plate surface and roller surface; the process cracks are large. In actual production practice, people can only increase the width of the billet to make up for the extension of the large cracks to meet the width required for the cold-rolled finished product. The amount of edge trimming in the cold rolling process is increased, resulting in more scrap and increased production costs. Therefore, reducing process cracks is of great significance to the production of cast-rolled plates. However, cold rolling can only avoid strip breakage by increasing the edge trimming width. The cracked edge phenomenon of the strip not only limits the production capacity and product quality of cold rolling, especially limits the yield of cold rolling, but also poses a safety hazard.

[0005] Therefore, how to minimize the occurrence of cracks is of great significance for the preparation of 8011 aluminum alloy foil. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a processing technology for 8011 aluminum alloy medicine foil, which is suitable for the preparation of 1300-1500mm crack-free medicine foil.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A processing technology of 8011 aluminum alloy medicine foil, the specific steps are as follows:

[0009] (1) smelting to obtain molten aluminum, controlling the iron content to be 0.75-0.78%, the silicon content to be 0.55-0.58%, and the titanium content to be 0.018-0.022%;

[0010] (2) refining and degassing the molten aluminum by combining powder spray refining and particle refining, and filtering to obtain a molten aluminum having a hydrogen content of ≤0.10 mL / 100 g;

[0011] (3) Casting and rolling in a casting and rolling mill to obtain a cast-rolled slab with a thickness of 6.6 to 6.8 mm;

[0012] (4) Cold rolling and foil rolling, degreasing and annealing.

[0013] Preferably, in step (1), the aluminum melt is prepared according to the following chemical compositions in mass percentage: 0.75-0.78% iron, 0.55-0.58% silicon, 0.018-0.022% titanium, 0.10-0.12% copper, 0.02-0.03% magnesium, 0.03-0.04% manganese, 0.01-0.02% zinc, 0.001-0.002% chromium, and the remainder is aluminum.

[0014] Preferably, in step (1), the smelting temperature is 735-745° C. and the smelting time is 5-6 hours.

[0015] Preferably, in step (2), the specific method of powder spray refining is: spraying a refining powder into the aluminum melt by high-purity nitrogen, and refining at 755-765° C. for 40-50 minutes, wherein the purity of the high-purity nitrogen is above 99.995%, and the refining powder is prepared by crushing sodium chloride, potassium chloride, sodium fluorosilicate, and calcium fluoride into particle sizes of 30-40 μm, respectively, and then uniformly mixing them in a mass ratio of 50-55:6-8:18-20:5-6, and the amount of the refining powder is 0.3% of the weight of the aluminum melt.

[0016] Preferably, in step (2), the specific method of particle refining is: spraying a particle refining agent into the aluminum melt by high-purity nitrogen, and refining at 755-765° C. for 40-50 minutes, wherein the purity of the high-purity nitrogen is above 99.995%, and the particle refining agent is made of magnesium chloride, potassium chloride, calcium chloride, and aluminum fluoride in a mass ratio of 40-50:15-20:15-20:5-6, and is made into particles with a particle size of 2-3 mm; the amount of the particle refining agent used is 0.15% of the weight of the aluminum melt.

[0017] Further preferably, the preparation method of the particle refining agent is as follows: first, magnesium chloride, potassium chloride, calcium chloride and aluminum fluoride are uniformly mixed, heated to melt, kept warm for 60 to 70 minutes, naturally cooled, crushed, and extruded into granules.

[0018] Preferably, in step (2), a 50ppi+60ppi filter sheet is used for filtering.

[0019] Preferably, in step (2), the hydrogen content of the aluminum melt is 0.08 to 0.10 mL / 100 g.

[0020] Preferably, in step (3), a twin-roll continuous casting and rolling mill is used for casting and rolling, and the specific process conditions are: the casting and rolling zone length is 48-50 mm, the front box temperature is 700-710°C, the front box liquid level is 250-300 mm, the cooling water temperature is 25-35°C, and the cooling water flow rate is 450-500 m 3 / h, the casting and rolling speed is 800-900mm / min.

[0021] Preferably, in step (4), the cold rolling is performed to a thickness of 0.16 to 0.18 mm, and the foil is rolled to a thickness of 0.028 to 0.030 mm.

[0022] Further preferably, the rolling passes of cold rolling and foil rolling are: 6.6-6.8 mm→3.9-4.1 mm→2.3-2.6 mm→1.4-1.6 mm→1-1.2 mm→0.5-0.6 mm→0.3-0.5 mm→0.16-0.18 mm→cleaning→intermediate annealing→0.12-0.13 mm→0.08-0.09 mm→0.055-0.060 mm→0.028-0.030 mm.

[0023] More preferably, the specific method of cleaning is: using 95-98° C. and 0.6-0.8 MPa high-pressure water jet cleaning.

[0024] More preferably, the process conditions of the intermediate annealing are: 360-370° C. for 12-15 hours.

[0025] Preferably, in step (4), the process conditions for degreasing annealing are as follows: degreasing at 200-210°C for 10-12 hours, heating to 250-260°C at 40-50°C / h, keeping warm for 18-20 hours, then cooling to 200-210°C at 40-50°C / h, keeping warm for 10-12 hours, and naturally cooling to room temperature.

[0026] Beneficial effects of the present invention:

[0027] The invention firstly smelts aluminum to obtain molten aluminum, controls the iron mass content to be 0.75-0.78%, the silicon mass content to be 0.55-0.58%, and the titanium mass content to be 0.018-0.022%; refines and degases the molten aluminum by combining powder spray refining and particle refining, filters, and obtains the molten aluminum with a hydrogen content of ≤0.10mL / 100g; casts and rolls the molten aluminum by a casting and rolling mill to obtain a cast-rolled plate blank with a thickness of 6.6-6.8mm; cold rolls and foil rolls, removes oil and anneals, and obtains a 8011 aluminum alloy medicine foil. The processing technology of the invention is suitable for the preparation of 1300-1500mm non-cracked medicine foil, eliminates edge cracks, reduces the generation of cold rolling waste, reduces waste, and has good quality of medicine foil.

[0028] The present invention prepares aluminum melt according to the following chemical components in mass percentage: 0.75-0.78% iron, 0.55-0.58% silicon, 0.018-0.022% titanium, 0.10-0.12% copper, 0.02-0.03% magnesium, 0.03-0.04% manganese, 0.01-0.02% zinc, 0.001-0.002% chromium, and the balance is aluminum. In particular, the mass content of iron, silicon and titanium is controlled, and the element ratio is adjusted to fundamentally reduce the formation of crack edges.

[0029] The aluminum melt is refined by combining powder spray refining and particle refining. The refining powder spray used in the powder spray refining and the particle refining agent used in the particle refining are very critical. The refining powder spray agent is obtained by crushing sodium chloride, potassium chloride, sodium fluorosilicate and calcium fluoride to a particle size of 30 to 40 μm respectively and then mixing them evenly. The particle refining agent is made of magnesium chloride, potassium chloride, calcium chloride and aluminum fluoride as raw materials to form particles with a particle size of 2 to 3 mm. The present invention makes the aluminum melt purer through refining, ensures the mechanical properties of the product, and reduces the formation of cracks.

[0030] Through the combined effect of the above multiple factors, the invention has no edge cracking during processing and does not require edge trimming, which greatly reduces the waste of resources caused by edge trimming and other problems. In addition, the obtained medicine foil has excellent mechanical properties and broad application prospects. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with embodiments. It should be noted that the following description is only for explaining the present invention and does not limit its contents.

[0032] For the convenience of comparison, the width of the processed medicine foil in the following embodiments and comparative examples is 1500 mm.

[0033] Embodiment 1:

[0034] A processing technology of 8011 aluminum alloy medicine foil, the specific steps are as follows:

[0035] (1) preparing an aluminum melt by smelting according to the following chemical composition in percentage by weight: 0.75% iron, 0.55% silicon, 0.018% titanium, 0.10% copper, 0.02% magnesium, 0.03% manganese, 0.01% zinc, 0.001% chromium, and the balance being aluminum;

[0036] (2) refining and degassing the molten aluminum by combining powder spray refining and particle refining, and filtering to obtain a molten aluminum having a hydrogen content of 0.08 mL / 100 g;

[0037] (3) Casting and rolling in a casting and rolling mill to obtain a cast-rolled slab with a thickness of 6.6 mm;

[0038] (4) Cold rolling and foil rolling, degreasing and annealing.

[0039] Wherein, in step (1), the smelting temperature is 735° C. and the smelting time is 5 hours.

[0040] In step (2), the specific method of powder spray refining is: spraying a refining powder into the aluminum melt by high-purity nitrogen, and refining at 755° C. for 40 minutes, wherein the purity of the high-purity nitrogen is above 99.995%, and the refining powder is prepared by crushing sodium chloride, potassium chloride, sodium fluorosilicate, and calcium fluoride into particles of 30 μm, respectively, and then uniformly mixing them in a mass ratio of 50:6:18:5, and the amount of the refining powder is 0.3% of the weight of the aluminum melt.

[0041] In step (2), the specific method of particle refining is: spraying a particle refining agent into the aluminum melt by high-purity nitrogen, and refining at 755° C. for 40 minutes, wherein the purity of the high-purity nitrogen is above 99.995%, and the particle refining agent is made of magnesium chloride, potassium chloride, calcium chloride, and aluminum fluoride in a mass ratio of 40:15:15:5 to form particles with a particle size of 2 mm; the amount of the particle refining agent used is 0.15% of the weight of the aluminum melt.

[0042] The preparation method of the particle refining agent is as follows: firstly, magnesium chloride, potassium chloride, calcium chloride and aluminum fluoride are uniformly mixed, heated to melt, kept warm for 60 minutes, naturally cooled, crushed, and extruded into granules to obtain the particle refining agent.

[0043] In step (2), a 50ppi+60ppi filter sheet is used for filtering.

[0044] In step (3), a twin-roll continuous casting and rolling mill is used for casting and rolling, and the specific process conditions are: the casting and rolling zone length is 48 mm, the front box temperature is 700°C, the front box liquid level is 250 mm, the cooling water temperature is 25°C, and the cooling water flow rate is 450 m 3 / h, the casting and rolling speed is 800mm / min.

[0045] In step (4), the rolling passes of cold rolling and foil rolling are: 6.6mm→3.9mm→2.3mm→1.4mm→1mm→0.5mm→0.3mm→0.16mm→cleaning→intermediate annealing→0.12mm→0.08mm→0.055mm→0.028mm.

[0046] The specific method of cleaning is: use 95°C and 0.6MPa high-pressure water jet cleaning.

[0047] The process conditions of the intermediate annealing are: 360°C for 12 hours.

[0048] In step (4), the process conditions of degreasing annealing are as follows: degreasing at 200°C for 10 hours, heating to 250°C at 40°C / h, keeping warm for 18 hours, cooling to 200°C at 40°C / h, keeping warm for 10 hours, and naturally cooling to room temperature.

[0049] Embodiment 2:

[0050] A processing technology of 8011 aluminum alloy medicine foil, the specific steps are as follows:

[0051] (1) preparing an aluminum melt by smelting according to the following chemical composition in percentage by weight: 0.78% iron, 0.58% silicon, 0.022% titanium, 0.12% copper, 0.03% magnesium, 0.04% manganese, 0.02% zinc, 0.002% chromium, and the balance being aluminum;

[0052] (2) refining and degassing the molten aluminum by combining powder spray refining and particle refining, and filtering to obtain a molten aluminum having a hydrogen content of 0.10 mL / 100 g;

[0053] (3) Casting and rolling in a casting and rolling mill to obtain a cast-rolled slab with a thickness of 6.8 mm;

[0054] (4) Cold rolling and foil rolling, degreasing and annealing.

[0055] Wherein, in step (1), the smelting temperature is 745°C and the smelting time is 6 hours.

[0056] In step (2), the specific method of powder spray refining is: spraying a refining powder into the aluminum melt by high-purity nitrogen, and refining at 765° C. for 50 minutes, wherein the purity of the high-purity nitrogen is above 99.995%, and the refining powder is prepared by crushing sodium chloride, potassium chloride, sodium fluorosilicate, and calcium fluoride into particles of 40 μm, respectively, and then uniformly mixing them in a mass ratio of 55:8:20:6, and the amount of the refining powder is 0.3% of the weight of the aluminum melt.

[0057] In step (2), the specific method of particle refining is: spraying a particle refining agent into the aluminum melt by high-purity nitrogen, and refining at 765° C. for 50 minutes, wherein the purity of the high-purity nitrogen is above 99.995%, and the particle refining agent is made of magnesium chloride, potassium chloride, calcium chloride, and aluminum fluoride in a mass ratio of 50:20:20:6 to form particles with a particle size of 3 mm; the amount of the particle refining agent used is 0.15% of the weight of the aluminum melt.

[0058] The preparation method of the particle refining agent is as follows: firstly, magnesium chloride, potassium chloride, calcium chloride and aluminum fluoride are uniformly mixed, heated to melt, kept warm for 70 minutes, naturally cooled, crushed, and extruded into granules to obtain the particle refining agent.

[0059] In step (2), a 50ppi+60ppi filter sheet is used for filtering.

[0060] In step (3), a twin-roll continuous casting and rolling mill is used for casting and rolling, and the specific process conditions are: the casting and rolling zone length is 50 mm, the front box temperature is 710°C, the front box liquid level is 300 mm, the cooling water temperature is 35°C, and the cooling water flow rate is 500m 3 / h, the casting and rolling speed is 900mm / min.

[0061] In step (4), the rolling passes of cold rolling and foil rolling are: 6.8mm→4.1mm→2.6mm→1.6mm→1.2mm→0.6mm→0.5mm→0.18mm→cleaning→intermediate annealing→0.13mm→0.09mm→0.060mm→0.030mm.

[0062] The specific method of cleaning is: use 98°C and 0.8MPa high-pressure water jet cleaning.

[0063] The process conditions of the intermediate annealing are: 370°C for 15 hours.

[0064] In step (4), the process conditions of degreasing annealing are as follows: degreasing at 210°C for 12 hours, heating to 260°C at 50°C / h, keeping warm for 20 hours, cooling to 210°C at 50°C / h, keeping warm for 12 hours, and naturally cooling to room temperature.

[0065] Embodiment 3:

[0066] A processing technology of 8011 aluminum alloy medicine foil, the specific steps are as follows:

[0067] (1) preparing an aluminum melt by smelting according to the following chemical composition in percentage by weight: 0.76% iron, 0.56% silicon, 0.020% titanium, 0.11% copper, 0.025% magnesium, 0.035% manganese, 0.015% zinc, 0.0015% chromium, and the balance being aluminum;

[0068] (2) refining and degassing the molten aluminum by combining powder spray refining and particle refining, and filtering to obtain a molten aluminum having a hydrogen content of 0.09 mL / 100 g;

[0069] (3) Casting and rolling in a casting and rolling mill to obtain a cast-rolled slab with a thickness of 6.7 mm;

[0070] (4) Cold rolling and foil rolling, degreasing and annealing.

[0071] Wherein, in step (1), the smelting temperature is 740°C and the smelting time is 5.5 hours.

[0072] In step (2), the specific method of powder spray refining is: spraying the refining powder into the aluminum melt by high-purity nitrogen, and refining at 760° C. for 45 minutes, wherein the purity of the high-purity nitrogen is above 99.995%, and the refining powder is prepared by crushing sodium chloride, potassium chloride, sodium fluorosilicate, and calcium fluoride into particles of 35 μm, respectively, and then uniformly mixing them in a mass ratio of 52:7:19:5.5, and the amount of the refining powder is 0.3% of the weight of the aluminum melt.

[0073] In step (2), the specific method of particle refining is: spraying a particle refining agent into the aluminum melt by high-purity nitrogen, and refining at 760° C. for 45 minutes, wherein the purity of the high-purity nitrogen is above 99.995%, and the particle refining agent is made of magnesium chloride, potassium chloride, calcium chloride, and aluminum fluoride in a mass ratio of 45:18:18:5.5 to form particles with a particle size of 3 mm; the amount of the particle refining agent used is 0.15% of the weight of the aluminum melt.

[0074] The preparation method of the particle refining agent is as follows: firstly, magnesium chloride, potassium chloride, calcium chloride and aluminum fluoride are uniformly mixed, heated to melt, kept warm for 60 to 70 minutes, naturally cooled, crushed, and extruded into granules to obtain the particle refining agent.

[0075] In step (2), a 50ppi+60ppi filter sheet is used for filtering.

[0076] In step (3), a twin-roll continuous casting and rolling mill is used for casting and rolling, and the specific process conditions are: the casting and rolling zone length is 49 mm, the front box temperature is 705°C, the front box liquid level is 280 mm, the cooling water temperature is 30°C, and the cooling water flow rate is 480 m 3 / h, the casting and rolling speed is 850mm / min.

[0077] In step (4), the rolling passes of cold rolling and foil rolling are: 6.7mm→4mm→2.5mm→1.5mm→1.1mm→0.55mm→0.4mm→0.17mm→cleaning→intermediate annealing→0.12mm→0.08mm→0.060mm→0.029mm.

[0078] The specific method of cleaning is: use 97°C and 0.7MPa high-pressure water jet cleaning.

[0079] The process conditions of the intermediate annealing are: 365°C for 13 hours.

[0080] In step (4), the process conditions for degreasing annealing are as follows: degreasing at 205°C for 11 hours, heating to 255°C at 45°C / h, keeping warm for 19 hours, cooling to 205°C at 45°C / h, keeping warm for 11 hours, and naturally cooling to room temperature.

[0081] Comparative Example 1

[0082] A processing technology of 8011 aluminum alloy medicine foil, the specific steps are as follows:

[0083] (1) preparing an aluminum melt by smelting according to the following chemical composition in percentage by weight: 0.75% iron, 0.55% silicon, 0.018% titanium, 0.10% copper, 0.02% magnesium, 0.03% manganese, 0.01% zinc, 0.001% chromium, and the balance being aluminum;

[0084] (2) refining the molten aluminum by powder spraying, refining and degassing, filtering, and obtaining a molten aluminum having a hydrogen content of 0.08 mL / 100 g;

[0085] (3) Casting and rolling in a casting and rolling mill to obtain a cast-rolled slab with a thickness of 6.6 mm;

[0086] (4) Cold rolling and foil rolling, degreasing and annealing.

[0087] Wherein, in step (1), the smelting temperature is 735° C. and the smelting time is 5 hours.

[0088] In step (2), the specific method of powder spray refining is: spraying a refining powder into the aluminum melt by high-purity nitrogen, and refining at 755° C. for 40 minutes, wherein the purity of the high-purity nitrogen is above 99.995%, and the refining powder is prepared by crushing sodium chloride, potassium chloride, sodium fluorosilicate, and calcium fluoride into particles of 30 μm, respectively, and then uniformly mixing them in a mass ratio of 50:6:18:5, and the amount of the refining powder is 0.3% of the weight of the aluminum melt.

[0089] In step (2), a 50ppi+60ppi filter sheet is used for filtering.

[0090] In step (3), a twin-roll continuous casting and rolling mill is used for casting and rolling, and the specific process conditions are: the casting and rolling zone length is 48 mm, the front box temperature is 700°C, the front box liquid level is 250 mm, the cooling water temperature is 25°C, and the cooling water flow rate is 450 m 3 / h, the casting and rolling speed is 800mm / min.

[0091] In step (4), the rolling passes of cold rolling and foil rolling are: 6.6mm→3.9mm→2.3mm→1.4mm→1mm→0.5mm→0.3mm→0.16mm→cleaning→intermediate annealing→0.12mm→0.08mm→0.055mm→0.028mm.

[0092] The specific method of cleaning is: use 95°C and 0.6MPa high-pressure water jet cleaning.

[0093] The process conditions of the intermediate annealing are: 360°C for 12 hours.

[0094] In step (4), the process conditions of degreasing annealing are as follows: degreasing at 200°C for 10 hours, heating to 250°C at 40°C / h, keeping warm for 18 hours, cooling to 200°C at 40°C / h, keeping warm for 10 hours, and naturally cooling to room temperature.

[0095] Comparative Example 2

[0096] A processing technology of 8011 aluminum alloy medicine foil, the specific steps are as follows:

[0097] (1) preparing an aluminum melt by smelting according to the following chemical composition in percentage by weight: 0.75% iron, 0.55% silicon, 0.018% titanium, 0.10% copper, 0.02% magnesium, 0.03% manganese, 0.01% zinc, 0.001% chromium, and the balance being aluminum;

[0098] (2) refining and degassing the molten aluminum by particle refining, and filtering to obtain a molten aluminum having a hydrogen content of 0.08 mL / 100 g;

[0099] (3) Casting and rolling in a casting and rolling mill to obtain a cast-rolled slab with a thickness of 6.6 mm;

[0100] (4) Cold rolling and foil rolling, degreasing and annealing.

[0101] Wherein, in step (1), the smelting temperature is 735° C. and the smelting time is 5 hours.

[0102] In step (2), the specific method of particle refining is: spraying a particle refining agent into the aluminum melt by high-purity nitrogen, and refining at 755° C. for 40 minutes, wherein the purity of the high-purity nitrogen is above 99.995%, and the particle refining agent is made of magnesium chloride, potassium chloride, calcium chloride, and aluminum fluoride in a mass ratio of 40:15:15:5 to form particles with a particle size of 2 mm; the amount of the particle refining agent used is 0.15% of the weight of the aluminum melt.

[0103] The preparation method of the particle refining agent is as follows: firstly, magnesium chloride, potassium chloride, calcium chloride and aluminum fluoride are uniformly mixed, heated to melt, kept warm for 60 minutes, naturally cooled, crushed, and extruded into granules to obtain the particle refining agent.

[0104] In step (2), a 50ppi+60ppi filter sheet is used for filtering.

[0105] In step (3), a twin-roll continuous casting and rolling mill is used for casting and rolling, and the specific process conditions are: the casting and rolling zone length is 48 mm, the front box temperature is 700°C, the front box liquid level is 250 mm, the cooling water temperature is 25°C, and the cooling water flow rate is 450 m 3 / h, the casting and rolling speed is 800mm / min.

[0106] In step (4), the rolling passes of cold rolling and foil rolling are: 6.6mm→3.9mm→2.3mm→1.4mm→1mm→0.5mm→0.3mm→0.16mm→cleaning→intermediate annealing→0.12mm→0.08mm→0.055mm→0.028mm.

[0107] The specific method of cleaning is: use 95°C and 0.6MPa high-pressure water jet cleaning.

[0108] The process conditions of the intermediate annealing are: 360°C for 12 hours.

[0109] In step (4), the process conditions of degreasing annealing are as follows: degreasing at 200°C for 10 hours, heating to 250°C at 40°C / h, keeping warm for 18 hours, cooling to 200°C at 40°C / h, keeping warm for 10 hours, and naturally cooling to room temperature.

[0110] Test example

[0111] With reference to GB / T 228-2002 "Room Temperature Tensile Test Methods for Metallic Materials", the tensile strength, yield strength and elongation of the aluminum alloy foils obtained in Examples 1 to 3 and Comparative Examples 1 and 2 were tested respectively. The results are shown in Table 1.

[0112] The appearance of the aluminum alloy foil was visually observed. The results are shown in Table 2.

[0113] Table 1. Mechanical properties of aluminum alloy foil

[0114] Tensile strength(MPa) Yield strength (MPa) Elongation(%) Example 1 211 98 8.5 Example 2 212 98 8.6 Example 3 216 101 9.0 Comparative Example 1 202 89 6.9 Comparative Example 2 204 90 7.1

[0115] Table 2. Comparison of appearance status

[0116] Appearance Status Example 1 The end surface is flush and clean, without burrs, flanges, or bumps. Example 2 The end surface is flush and clean, without burrs, flanges, or bumps. Example 3 The end surface is flush and clean, without burrs, flanges, or bumps. Comparative Example 1 The end face has obvious burrs, no flanges, and no bumps Comparative Example 2 The end face has obvious burrs, no flanges, and no bumps

[0117] It can be seen from Table 1 and Table 2 that the end faces of the aluminum alloy foils obtained in Examples 1 to 3 are flat and clean, without burrs, flanges, or bruises, and have good mechanical properties.

[0118] Comparative Example 1 uses powder spray refining, and Comparative Example 2 uses particle refining. The end surface has obvious burrs and the mechanical properties are also significantly deteriorated, which shows that the combination of powder spray refining and particle refining of the present invention is beneficial to improving the quality of aluminum alloy medicine foil.

[0119] Although the above describes the specific implementation methods of the present invention, it does not limit the scope of protection of the present invention. Based on the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present invention.

Claims

1. A processing technology for 8011 aluminum alloy medicine foil, characterized in that: The specific steps are as follows: (1) Smelting to obtain aluminum melt, controlling the iron content to be 0.75-0.78%, the silicon content to be 0.55-0.58%, and the titanium content to be 0.018-0.022%; (2) The molten aluminum is refined and degassed by combining powder spray refining and particle refining, and filtered to obtain a molten aluminum having a hydrogen content of ≤0.10 mL / 100 g; (3) Casting and rolling by a casting and rolling mill to obtain a cast-rolled slab with a thickness of 6.6 to 6.8 mm; (4) Cold rolling and foil rolling, degreasing and annealing; In step (1), an aluminum melt is prepared according to the following chemical compositions in mass percentage: 0.75-0.78% iron, 0.55-0.58% silicon, 0.018-0.022% titanium, 0.10-0.12% copper, 0.02-0.03% magnesium, 0.03-0.04% manganese, 0.01-0.02% zinc, 0.001-0.002% chromium, and the balance is aluminum; In step (2), the specific method of powder spray refining is: spraying a refining powder into the aluminum melt by high-purity nitrogen, and refining at 755-765° C. for 40-50 minutes, wherein the purity of the high-purity nitrogen is above 99.995%, and the refining powder is obtained by crushing sodium chloride, potassium chloride, sodium fluorosilicate, and calcium fluoride into particles of 30-40 μm, respectively, and then uniformly mixing them in a mass ratio of 50-55:6-8:18-20:5-6, and the amount of the refining powder is 0.3% of the weight of the aluminum melt; In step (2), the specific method of particle refining is: spraying a particle refining agent into the aluminum melt by high-purity nitrogen, and refining at 755-765° C. for 40-50 minutes, wherein the purity of the high-purity nitrogen is above 99.995%, and the particle refining agent is made of magnesium chloride, potassium chloride, calcium chloride, and aluminum fluoride in a mass ratio of 40-50:15-20:15-20:5-6, and is made into particles with a particle size of 2-3 mm; the amount of the particle refining agent used is 0.15% of the weight of the aluminum melt.

2. The processing technology of 8011 aluminum alloy medicine foil according to claim 1 is characterized in that: In step (1), the smelting temperature is 735-745° C. and the smelting time is 5-6 hours.

3. The processing technology of 8011 aluminum alloy medicine foil according to claim 1 is characterized in that: In step (2), a 50ppi+60ppi filter sheet is used for filtering.

4. The processing technology of 8011 aluminum alloy medicine foil according to claim 1 is characterized in that: In step (2), the hydrogen content of the aluminum melt is 0.08 to 0.10 mL / 100 g.

5. The processing technology of 8011 aluminum alloy medicine foil according to claim 1 is characterized in that: In step (3), a twin-roll continuous casting and rolling mill is used for casting and rolling. The specific process conditions are: the casting and rolling zone length is 48-50 mm, the front box temperature is 700-710°C, the front box liquid level is 250-300 mm, the cooling water temperature is 25-35°C, and the cooling water flow rate is 450-500 m 3 / h, the casting and rolling speed is 800-900mm / min.

6. The processing technology of 8011 aluminum alloy medicine foil according to claim 1 is characterized in that: In step (4), the cold rolling is performed to a thickness of 0.16 to 0.18 mm, and the foil is rolled to a thickness of 0.028 to 0.030 mm.

7. The processing technology of 8011 aluminum alloy medicine foil according to claim 1 is characterized in that: In step (4), the process conditions of degreasing annealing are as follows: degreasing at 200-210°C for 10-12 hours, heating to 250-260°C at 40-50°C / h, keeping warm for 18-20 hours, cooling to 200-210°C at 40-50°C / h, keeping warm for 10-12 hours, and naturally cooling to room temperature.