A casting and rolling production method for wide width 8006 alloy container foil

Abstract

A casting and rolling production method for wide-width 8006 alloy container foil comprises the following steps: smelting before casting and rolling production, online refining and purification during casting and rolling production, and rolling during casting and rolling production to form a blank; the blank after casting and rolling is subjected to homogenization annealing, cold rolling, intermediate annealing, cold rolling, slitting and packaging to become a finished 8006 alloy container foil; and the casting and rolling method can produce wide-width 8006 alloy container foil.

Description

Technical Field

[0001] The invention relates to the technical field of wide-width casting nozzles, in particular to a casting and rolling production method for wide-width 8006 alloy container foil. Background Art

[0002] As is known, aluminum container foil products have been rapidly developed in recent years due to their own recyclability and harmlessness to the environment. Container foil products with high technical content, high strength, high elongation and high surface quality are very popular among customers. The quality of aluminum container foil is often determined by the alloy composition during smelting. At present, the alloys used to produce container foil are mainly 1100, 3003, 8011 and 8006. Among them, the material properties of 1100, 3003 and 8011 alloys are poor. Containers made of these alloys have poor performance. The mechanical properties and surface quality of the container foil cannot reach the level of high-end products; 8006 aluminum alloy is an Al-Fe-Mn ternary phase system. The main components of the alloy are Al, FeAl3, MnAl6, (FeMn)Al6 and impurity phase Al12Fe3Si2, among which Mn has a solid solution strengthening effect, which can increase the recrystallization temperature of the alloy and refine the recrystallized grains, thereby improving the mechanical properties of the alloy. As a result, the mechanical properties and surface quality of the produced 8006 aluminum container foil can meet the needs of the high-end market;

[0003] The traditional production of 8006 alloy container foil is a hot rolling method. Although the hot rolling method can produce qualified 8006 alloy container foil, this method has problems such as high energy consumption, high pollution and high cost in the production process. In addition, when the hot rolling method is used, the width of the container foil produced is narrow due to the ductility of the 8006 alloy itself. Although the casting and rolling method can solve the problems of energy consumption, pollution and cost, when the 8006 alloy container foil is produced by the traditional casting and rolling method, on the one hand, since the spacing of multiple diversion blocks in the traditional casting nozzle is the same and there is only one liquid inlet, when the wide container foil is produced, when the aluminum liquid flows out of the traditional casting nozzle to the casting and rolling area, the aluminum liquid outflow speed in the middle and both ends of the casting nozzle is uneven. On the other hand, due to the problems of the traditional casting and rolling process, the cast-rolled slab will eventually be prone to intracrystalline segregation, resulting in poor surface quality and mechanical properties of the slab. Therefore, in summary, there is a need for a casting and rolling production method that can produce wide 8006 alloy container foil in the market. Summary of the invention

[0004] In order to overcome the shortcomings of the background technology, the present invention discloses a casting and rolling production method of a wide width 8006 alloy container foil.

[0005] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme:

[0006] A casting and rolling production method for wide width 8006 alloy container foil comprises the following steps:

[0007] a. Melting steps before casting and rolling production:

[0008] 1) Add 40-50% raw aluminum, 10% scrap, and the rest is aluminum ingots into the smelting furnace, then heat the smelting furnace to 700±10℃, remove the scum, then start the permanent magnetic stirring, and continue to heat up. When the temperature reaches 745±2℃, stop heating;

[0009] 2) Then the aluminum melt in the smelting furnace is tested, and according to the test results, the various element components required to be added to the 8006 alloy are calculated and proportioned, and finally the chemical composition mass percentage of the melt in the smelting furnace is adjusted to: Fe: 1.2-1.5%, Si: 0.10-0.15%, Mn: 0.3-0.6%, Mg: ≤0.01%, Zn: ≤0.03%, Cu: ≤0.01%, Cd: ≤0.001%, Li: ≤0.0002%, Na: ≤0.0005%, Pb: ≤0.005%, Ti: 0.02-0.03%, and the rest is Al;

[0010] 3) When the sample is qualified after the test, it is 8006 aluminum alloy melt. After the 8006 aluminum alloy melt is refined, allowed to stand and deslagging in the smelting furnace, it is introduced into the holding furnace for refining, standing and deslagging again, and then kept warm in the holding furnace;

[0011] b. Online refinement and purification steps during casting and rolling production: the 8006 aluminum alloy melt in the holding furnace is output to a double-plug launder capable of reversely adding aluminum-titanium-boron wires, and then the 8006 aluminum alloy melt passes through a degassing box and a filter box in sequence before flowing out to the front box;

[0012] c. Rolling steps during casting and rolling production: the 8006 aluminum alloy melt in the front box flows into the wide casting nozzle through the flow channel, and then the 8006 aluminum alloy melt is divided in the wide casting nozzle and flows out from the liquid outlet nozzle to the casting and rolling area of ​​the wide rolling mill, and finally the 8006 aluminum alloy melt is cooled and cast-rolled by two casting rollers on the wide rolling mill;

[0013] The width of the wide casting nozzle is greater than 2000 mm, and the wide casting nozzle has two liquid inlets, the number of diverter blocks inside the wide casting nozzle is set to an odd number, the multiple diverter blocks are divided into a central diverter block and multiple peripheral diverter blocks, and the peripheral diverter blocks on both sides of the central diverter block are symmetrically arranged; the gap width between the central diverter block and the two adjacent peripheral diverter blocks is set to a, a = 8 to 10 mm, and the gap widths between the remaining two adjacent peripheral diverter blocks are set to b1, b2, ... b in sequence. x , and b x -b x-1=b1-a+4*(x-1), b1-a=6~7mm, x≤5; the distance between the central diverter block and the end face where the wide-width casting nozzle inlet is located is h, h=8~12mm, and the distances between the multiple surrounding diverter blocks and the end face where the wide-width casting nozzle inlet is located are h1, h2, …h x ;h x =h+6x, x≤5;

[0014] d. The blank after casting and rolling is subjected to homogenization annealing, cold rolling, intermediate annealing, cold rolling, slitting and packaging to become the finished 8006 alloy container foil;

[0015] Preferably, the content of Fe+Mn in the 8006 aluminum alloy melt does not exceed 1.90%;

[0016] Preferably, the refining in the smelting furnace is carried out twice. The first refining adopts the "N+Z" mode of powder spray refining. After argon and 2 kg / t aluminum powder refining agent are mixed respectively, they are sprayed into the melt through a powder spray refining machine for refining. The refining time is 18±2 min, and the bubble height during refining is less than 200 mm. After the first refining, the 8006 aluminum alloy melt is allowed to stand for 10 minutes, and then slag is removed. After the slag removal is completed, the temperature is raised to 745±2°C and the second refining is carried out. The second refining also adopts the "N+Z" mode, and the refining agent is set to a liquid refining agent of 100±10 ml / t aluminum. The liquid refining agent is passed into the melt through a liquid refining machine for refining operation. The refining time is 18±2 min, and the bubble height during refining is less than 140±10 mm. After the second refining is completed, it is allowed to stand for 10 minutes, and then slag is removed. After that, the 8006 aluminum alloy melt is introduced into a holding furnace for the next step.

[0017] Preferably, after the 8006 aluminum alloy melt is introduced into the holding furnace, the 8006 aluminum alloy melt in the holding furnace is refined using a liquid refining agent of 100±10 ml / t aluminum, and 80-120 kg of solid cold material is added to the holding furnace before refining. After refining, the furnace is allowed to stand for 10 minutes, and then the holding furnace is deslagging and heated, and the above refining operation is repeated every 4-4.5 hours, and finally the temperature of the holding furnace is controlled at 735-745°C;

[0018] Preferably, each time after the 8006 aluminum alloy melt is introduced into the holding furnace, the holding furnace also needs to be refined once using a liquid refining agent;

[0019] Preferably, the double-insert plate flow trough comprises a trough body for aluminum liquid to flow, two insert plates and a flow block: the trough body is in a "U" shape, and the liquid inlet end and the liquid outlet end of the inner cavity of the trough body are respectively provided with an insert plate perpendicular to the flow direction of aluminum liquid in the trough body, and the gap between the bottom of the two insert plates and the inner bottom surface of the trough body is respectively set as a liquid inlet hole and a liquid outlet hole; the inner bottom surface of the trough body is provided with a flow block, the flow block is located between the two insert plates, and the flow block is a structure with a high middle and low ends, the slopes at both ends of the flow block correspond to the liquid inlet hole and the liquid outlet hole one by one, and the height of the flow block is greater than the height of the liquid inlet hole and the liquid outlet hole;

[0020] Preferably, the gas supply pressure of the degassing box is greater than 0.15 MPa, the flow rate is greater than 18 L / min, and the volatile gas mixed with argon and liquid refining agent is introduced into the degassing box rotor, the rotor speed of the degassing box rotor is set to 500-600 rpm, and the temperature of the degassing box is set to 720-730°C;

[0021] Preferably, the speed of adding the aluminum titanium boron wire into the flow channel is 13-16 cm / min;

[0022] Preferably, during the casting and rolling production, the width of the two casting rolls on the wide rolling mill is 2300-2500 mm, the roll diameter of the casting roll is 1180-1200 mm, the roll crown of the casting roll is 0.40-0.45 mm, the roll gap of the casting roll is 3.9-4.0 mm, and the length of the casting and rolling zone is 60-65 mm;

[0023] Preferably, during casting and rolling production, the rolling speed of the wide rolling mill is 730±20 mm / min, the temperature of cooling water used to cool the casting rolls on the wide rolling mill is 25-30°C, and the temperature of the front box is 695-700°C.

[0024] Due to the adoption of the above-mentioned technical solution, the present invention has the following beneficial effects:

[0025] The present invention discloses a casting and rolling production method for a wide-width 8006 alloy container foil. The method utilizes a scientific raw material ratio, thereby ensuring the quality of the melt at the source and reducing impurities, thereby making subsequent steps easier to carry out. In addition, the ratio combination makes the smelting process smoother and does not require unnecessary additional steps, so it also has an energy-saving effect. The double-plug plate flow channel can avoid the precipitation of aluminum-titanium-boron wires and can also make the aluminum-titanium-boron wires and the 8006 aluminum alloy melt more evenly mixed. The wide-width casting nozzle ensures that the 8006 aluminum alloy melt can flow out evenly from the liquid outlet nozzle, thereby ensuring the surface quality of the rolled wide-width 8006 alloy container foil. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the method flow of the present invention;

[0027] Figure 2 This is a schematic diagram of the wide casting nozzle structure;

[0028] Figure 3 Schematic diagram of the double-plate flow channel structure

[0029] Figure 4 It is a schematic diagram of the plug-in plate structure of the double-plug-in plate flow trough.

[0030] In the figure: 1. wide casting nozzle; 1.1. liquid inlet; 1.2. central diverter block; 1.3. peripheral diverter block; 1.4. liquid outlet nozzle; 2. double plug-in plate flow trough; 2.1. trough body; 2.2. plug-in plate; 2.3. liquid inlet hole; 2.4. liquid outlet hole; 2.5. flow block. DETAILED DESCRIPTION

[0031] The present invention can be explained in detail by the following examples, and the purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0032] Combined with Figure 1-4 The casting and rolling production method of a wide width 8006 alloy container foil comprises the following steps:

[0033] a. Melting steps before casting and rolling production:

[0034] 1) Add 40-50% of raw aluminum, 10% of scrap, and the rest of aluminum ingots into the smelting furnace. This raw material combination can ensure the quality of the melt from the source and reduce the impurities in the melt, so that the subsequent steps can be carried out more easily. In addition, since this ratio combination is relatively fast during smelting, it can also save energy consumed during smelting. Then, heat the smelting furnace to 700±10℃, remove the scum, then start the permanent magnetic stirring, and continue to heat up. When the temperature reaches 745±2℃, the heating stops;

[0035] 2) Then the aluminum melt in the smelting furnace is tested, and according to the test results, the various element components required to be added to the 8006 alloy are calculated and proportioned, and finally the chemical composition mass percentage of the melt in the smelting furnace is adjusted to: Fe: 1.2-1.5%, Si: 0.10-0.15%, Mn: 0.3-0.6%, Mg: ≤0.01%, Zn: ≤0.03%, Cu: ≤0.01%, Cd: ≤0.001%, Li: ≤0.0002%, Na: ≤0.0005%, Pb: ≤0.005%, Ti: 0.02-0.03%, and the rest is Al; the required 8006 aluminum alloy is made by adding metal elements to the melt. However, after adding Mn to the melt, a large amount of brittle compound MnAl6 is easily formed in the melt, which leads to the alloy The metal will crack during stamping, and Mn will segregate in the crystal during extreme cooling, so that the peritectic transformation of MnAl4 to MnAl6 phase cannot be completely carried out during the crystallization process, resulting in the annealed material not being able to obtain a fine and uniform grain structure. Therefore, an appropriate amount of Fe should be added at the same time as Mn, because when the Si content is low, Fe can greatly reduce the solubility of Mn in the melt, and after adding Fe, more FeAl3 strengthening phases will appear in the melt, thereby greatly improving the mechanical properties of the alloy. However, Fe and Mn will form a segregation aggregate of (FeMn)Al6 primary crystals in the melt. Therefore, according to needs, the content of Fe+Mn in the 8006 aluminum alloy melt does not exceed 1.90%, thereby preventing the formation of segregation aggregates of (FeMn)Al6 primary crystals;

[0036] 3) When the sample is qualified after the test, it is 8006 aluminum alloy melt. The 8006 aluminum alloy melt is refined, left to stand and slag is removed in the melting furnace. In addition, the refining is carried out twice. The first time, the powder refining of "N+Z" mode is adopted. Argon gas and 2kg / t aluminum powder refining agent are mixed respectively, and then sprayed into the melt through the powder refining machine for refining. The refining time is 18±2min, and the bubble height during refining is less than 200mm. After the first refining is completed, it is left to stand for 10 minutes, and then the slag is removed by floating to the surface of the melt, so as to clean up some impurities. Through this refining process, Effectively remove most of the floating impurities in the melt; after the slag is removed, the temperature is raised to 745±2℃ and the second refining is carried out. The second refining also adopts the "N+Z" mode, and the refining agent is set to 100±10ml / t aluminum liquid refining agent. The liquid refining agent is introduced into the melt through the liquid refining machine for refining operation. The refining time is 18±2min, and the bubble height during refining is less than 140±10mm. After the second refining is completed, it is left to stand for 10 minutes, and then the slag is removed, and then it is introduced into the insulation furnace for insulation operation, which can effectively remove most of the harmful gases and impurities in the melt;

[0037] After that, the 8006 aluminum alloy melt is introduced into the holding furnace for refining, standing and slag removal again, and then kept warm in the holding furnace. According to needs, after the 8006 aluminum alloy melt is introduced into the holding furnace, the 8006 aluminum alloy melt in the holding furnace is refined using a liquid refining agent of 100±10ml / t aluminum, and 80-120kg of solid cold material is added to the holding furnace before refining. After refining, the furnace is allowed to stand for 10 minutes, and then the holding furnace is slag-removed and heated up, and the temperature is increased every 4- Repeat the above refining operation for 4.5h, and finally control the temperature of the holding furnace at 735-745℃. At this time, the 8006 aluminum alloy melt in the holding furnace is the melt that initially meets the needs of casting and rolling production, and this temperature can keep the aluminum alloy melt in a molten state; in addition, each time after the 8006 aluminum alloy melt is introduced into the holding furnace, it is also necessary to use a liquid refining agent to refine the holding furnace once, so as to ensure that the temperature of the 8006 aluminum alloy melt in the holding furnace is constant, the melt composition is uniform, and the gas slag content is low;

[0038] b. Online refinement and purification steps during casting and rolling production: The 8006 aluminum alloy melt in the insulation furnace is output to a double-plug-plate flow channel 2 into which aluminum-titanium-boron wire can be added in reverse. According to the needs, the double-plug-plate flow channel 2 comprises a trough body 2.1 for aluminum liquid to flow, two plug-ins 2.2 and a flow block 2.5: the trough body 2.1 is in a "U" shape, and the liquid inlet and liquid outlet ends of the inner cavity of the trough body 2.1 are respectively provided with a plug-in plate 2.2 perpendicular to the flow direction of aluminum liquid in the trough body 2.1, and the bottom of the two plug-ins 2.2 is connected to the trough body. The gaps between the inner bottom surfaces of the tank body 2.1 are respectively set as a liquid inlet hole 2.3 and a liquid outlet hole 2.4, wherein the liquid inlet hole 2.3 can make the incoming aluminum liquid form an undercurrent, thereby forming a uniform flushing force on the added molten or incompletely melted aluminum titanium boron wire; the inner bottom surface of the tank body 2.1 is provided with a flow block 2.5, which is located between the two plug plates 2.2, and the flow block 2.5 is a structure with a high middle and low ends, and the slopes at both ends of the flow block 2.5 are respectively in one-to-one contact with the liquid inlet hole 2.3 and the liquid outlet hole 2.4. Correspondingly, the height of the flow block 2.5 is greater than the height of the liquid inlet hole 2.3 and the liquid outlet hole 2.4. The flow block 2.5 can block the aluminum liquid, and then the tank body 2.1 located between the two plug plates 2.2 forms an eddy current area, so that the 8006 aluminum alloy melt and the double aluminum titanium boron wire can be evenly mixed in the area. The plug plate located at the liquid inlet end can generate static pressure on the 8006 aluminum alloy melt, that is, the aluminum liquid, so that the aluminum liquid can obtain a certain amount of kinetic energy when passing through the liquid inlet hole 2.3. When the aluminum liquid flows toward the baffle block 2.5, the aluminum titanium boron wire at the bottom of the groove can be washed away, and finally the aluminum titanium boron wire is prevented from being precipitated on the bottom of the groove body, and the liquid outlet hole 2.4 can provide kinetic energy addition to the mixed liquid after the aluminum liquid and the aluminum titanium boron wire pass through, so that the mixed melt is more uniform; in particular, the speed of adding the aluminum titanium boron wire into the double plug-in plate flow groove 2 is 13-16cm / min, at which the aluminum titanium boron wire and the aluminum liquid passing through the flow groove can be fully mixed;

[0039] Then the 8006 aluminum alloy melt passes through the degassing box and the filter box in turn, and flows out into the front box, wherein the centrifugal force generated by the rotation of the rotor in the degassing box causes the mixed gas entering the rotor to diffuse into a large number of bubbles, and the bubbles are dispersed into the melt in the degassing box, and the bubbles absorb hydrogen and adsorb impurities in the melt by the partial pressure difference and surface adsorption principle in the melt, and the hydrogen and impurities are carried out to the surface of the melt as the bubbles rise, thereby achieving deep purification of the 8006 aluminum alloy melt. In addition, the gas supply pressure of the degassing box is greater than 0.15MPa and the flow rate is greater than 18L / min, which can make the degassing effect of the degassing box better, and the rotor speed of the degassing box rotor is set to 500-600rpm, and the temperature of the degassing box is set to 720-730℃, which is also to improve the degassing and slag removal effects of the degassing box.

[0040] c. Rolling steps during casting and rolling production: the 8006 aluminum alloy melt in the front box flows into the wide casting nozzle 1 through the flow channel, and then the 8006 aluminum alloy melt is divided in the wide casting nozzle 1, and then flows out from the liquid outlet nozzle 1.4 to the casting and rolling area of ​​the wide rolling mill, and finally the 8006 aluminum alloy melt is cooled and cast-rolled by two casting rollers on the wide rolling mill;

[0041] The width of the wide-width casting nozzle 1 is greater than 2000 mm, and the wide-width casting nozzle 1 has two liquid inlets 1.1, and the liquid inlet speed of the wide-width casting nozzle 1 can be improved by the two liquid inlets 1.1. The number of diverter blocks inside the wide-width casting nozzle 1 is set to an odd number, and the multiple diverter blocks are divided into a central diverter block 1.2 and multiple surrounding diverter blocks 1.3. The surrounding diverter blocks 1.3 on both sides of the central diverter block 1.2 are symmetrically arranged; the gap width between the central diverter block 1.2 and the two adjacent surrounding diverter blocks 1.3 is set to a, a = 8 ~ 10 mm, and the gap widths between the remaining two adjacent surrounding diverter blocks 1.3 are set to b1, b2, and b3, respectively. 2、 …b x , and b x -b x-1 =b1-a+4*(x-1), b1-a=6~7mm, x≤5; the distance between the central diverter block 1.2 and the end face where the liquid inlet 1.1 of the wide casting nozzle 1 is located is h, h=8~12mm, and the distances between the plurality of surrounding diverter blocks 1.3 and the end face where the liquid inlet 1.1 of the wide casting nozzle 1 is located are h1, h2, …h in sequence. x ;h x =h+6x, x≤5, by setting the plurality of diverter blocks to the middle diverter staggered structure, the 8006 aluminum alloy melt flowing into the two liquid inlets 1.1 can be evenly diverted by the plurality of diverter blocks, and then flow out from the liquid nozzle at the same time, thereby ensuring that the billet will not have intracrystalline segregation during rolling in the wide-width rolling mill;

[0042] According to the needs, during the casting and rolling production, the width of the two casting rolls on the wide rolling mill is 2300-2500mm, the roll diameter of the casting roll is 1180-1200mm, the roll crown of the casting roll is 0.40-0.45mm, the roll gap of the casting roll is 3.9-4.0mm, and the length of the casting and rolling zone is 60-65mm. According to the parameters of the rolling mill, the casting and rolling needs of the 8006 aluminum alloy melt can be fully met; in addition, during the casting and rolling production, the rolling speed of the wide rolling mill is 730±20mm / min, the temperature of the cooling water used to cool the casting rolls on the wide rolling mill is 25-30℃, and the temperature of the front box is 695-700℃. Since the rolling of the rolling mill is a step of billet forming, these three process parameters are the key to solving the intracrystalline segregation of the slab;

[0043] d. After casting and rolling, the billet undergoes homogenization annealing, cold rolling, intermediate annealing, cold rolling, slitting and packaging to become the finished 8006 alloy container foil.

[0044] Embodiment 1 of this casting and rolling production method is:

[0045] a. Melting steps before casting and rolling production:

[0046] 1) Add 40% raw aluminum, 10% scrap, and the rest is aluminum ingots into the smelting furnace, then heat the smelting furnace to 690°C, remove the scum, then start the permanent magnetic stirring, and continue to heat up. When the temperature reaches 743°C, stop heating;

[0047] 2) Then the aluminum melt in the smelting furnace is tested, and according to the test results, the various element components required to be added to the 8006 alloy are calculated and proportioned, and finally the chemical composition mass percentage of the melt in the smelting furnace is adjusted to: Fe: 1.2%, Si: 0.10%, Mn: 0.5%, Mg: 0.01%, Zn: 0.03%, Cu: 0.01%, Cd: 0.001%, Li: 0.0002%, Na: 0.0005%, Pb: 0.005%, Ti: 0.02%, and the rest is Al;

[0048] 3) When the sample is qualified after the test, it is 8006 aluminum alloy melt, and the 8006 aluminum alloy melt is refined, left to stand and slag removed in the smelting furnace; in addition, the refining in the smelting furnace is carried out twice, the first time adopts the "N+Z" mode of powder spray refining, argon and 2 kg / t aluminum powder refining agent are mixed respectively, and then sprayed into the melt through the powder spray refining machine for refining, the refining time is 16 minutes, and the bubble height during refining is less than 200 mm, and the 8006 aluminum alloy melt after the first refining is left to stand for 10 minutes, and then slag removal is carried out; after slag removal is completed, the temperature is raised to 743℃ and the second refining is carried out. The second refining also adopts the "N+Z" mode, and the refining agent is set as 90ml / t aluminum liquid refining agent. The liquid refining agent is introduced into the melt through the liquid refining machine for refining operation. The refining time is 16min, and the bubble height during refining is less than 130mm. After the second refining is completed, it is allowed to stand for 10 minutes, and then slag removal is carried out. After that, the 8006 aluminum alloy melt is introduced into the holding furnace for the next step;

[0049] The refined 8006 aluminum alloy melt is introduced into the holding furnace for refining, standing and slag removal, and then kept warm in the holding furnace; according to needs, after the 8006 aluminum alloy melt is introduced into the holding furnace, the 8006 aluminum alloy melt in the holding furnace is refined using a liquid refining agent of 90 ml / t aluminum, and 80 kg of solid cold material is added to the holding furnace before refining, and after refining, the furnace is allowed to stand for 10 minutes, and then the holding furnace is slag removed and heated, and the above refining operation is repeated every 4 hours, and finally the temperature of the holding furnace is controlled at 735°C;

[0050] b. Online refinement and purification steps during casting and rolling production: the 8006 aluminum alloy melt in the holding furnace is output to the double-plug launder 2 to which aluminum-titanium-boron wire can be added in reverse, and in particular, the adding speed of the aluminum-titanium-boron wire is 13 cm / min, and then the 8006 aluminum alloy melt passes through the degassing box and the filter box in sequence, and then flows out into the front box. In addition, the air supply pressure of the degassing box is 0.15 MPa, the flow rate is 18 L / min, and the volatile gas mixed with argon and liquid refining agent is introduced into the degassing box rotor, the rotor speed of the degassing box rotor is set to 500 rpm, and the temperature of the degassing box is set to 720°C;

[0051] c. Rolling steps during casting and rolling production: the 8006 aluminum alloy melt in the front box flows into the wide casting nozzle 1 through the flow channel, and then the 8006 aluminum alloy melt is divided in the wide casting nozzle 1, and then flows out from the liquid outlet nozzle 1.4 to the casting and rolling area of ​​the wide rolling mill, and finally the 8006 aluminum alloy melt is cooled and cast-rolled by two casting rollers on the wide rolling mill; according to needs, the width of the two casting rollers on the wide rolling mill is 2300mm, the roller diameter of the casting roller is 1180mm, the roller convexity of the casting roller is 0.40mm, the roller gap of the casting roller is 4.0mm, and the length of the casting and rolling area is 65mm; and the rolling speed of the wide rolling mill is 750mm / min, the temperature of the cooling water used to cool the casting rollers on the wide rolling mill is 26°C, and the temperature of the front box is 698°C;

[0052] The width of the wide casting nozzle 1 is 2000 mm, and the wide casting nozzle 1 has two liquid inlets 1.1, and the number of diverter blocks inside the wide casting nozzle 1 is an odd number, and the multiple diverter blocks are divided into a central diverter block 1.2 and multiple surrounding diverter blocks 1.3, and the surrounding diverter blocks 1.3 on both sides of the central diverter block 1.2 are symmetrically arranged; the gap width between the central diverter block 1.2 and the two adjacent surrounding diverter blocks 1.3 is set to a, a = 8 mm, and the gap widths between the remaining two adjacent surrounding diverter blocks 1.3 are set to b1, b2, b3, respectively. 2、 …b x , and b x -b x-1 =b1-a+4*(x-1), b1-a=6mm, x=3; the distance between the central diverter block 1.2 and the end face where the liquid inlet 1.1 of the wide casting nozzle 1 is located is h, h=8mm, and the distances between the plurality of surrounding diverter blocks 1.3 and the end face where the liquid inlet 1.1 of the wide casting nozzle 1 is located are h1, h2, ... h x ;h x =h+6x, x=3;

[0053] d. The blank after casting and rolling is subjected to homogenization annealing, cold rolling, intermediate annealing, cold rolling, slitting and packaging to become the finished 8006 alloy container foil;

[0054] Embodiment 2 of this casting and rolling production method is

[0055] a. Melting steps before casting and rolling production:

[0056] 1) Add 45% of raw aluminum, 10% of scrap, and the rest of aluminum ingots into the smelting furnace, then heat the smelting furnace to 700°C, remove the scum, then start the permanent magnetic stirring, and continue to heat up. When the temperature reaches 745°C, stop heating;

[0057] 2) Then the aluminum melt in the smelting furnace is tested, and according to the test results, the various element components required to be added to the 8006 alloy are calculated and proportioned, and finally the chemical composition mass percentage of the melt in the smelting furnace is adjusted to: Fe: 1.4%, Si: 0.12%, Mn: 0.4%, Mg: 0.01%, Zn: 0.03%, Cu: 0.01%, Cd: 0.001%, Li: 0.0002%, Na: 0.0005%, Pb: 0.005%, Ti: 0.025%, and the rest is Al;

[0058] 3) When the sample is qualified after the test, it is 8006 aluminum alloy melt. After the 8006 aluminum alloy melt is refined, left to stand and deslagging in the smelting furnace, it is introduced into the insulation furnace for refining, standing and deslagging again, and then kept warm in the insulation furnace; in addition, the refining in the smelting furnace is carried out twice, the first time adopts the "N+Z" mode of powder spray refining, after the argon gas and the 2kg / t aluminum powder refining agent are mixed respectively, the powder spray refining machine is used to spray into the melt for refining, the refining time is 18min, and the bubble height during refining is less than 200mm, the first refining The 8006 aluminum alloy melt is left to stand for 10 minutes after completion, and then the slag is removed. After the slag is removed, the temperature is raised to 745°C and the second refining is carried out. The second refining also adopts the "N+Z" mode, and the refining agent is set as a liquid refining agent of 100ml / t aluminum. The liquid refining agent is introduced into the melt through a liquid refining machine for refining. The refining time is 18 minutes, and the bubble height during refining is less than 140mm. After the second refining is completed, it is left to stand for 10 minutes, and then the slag is removed. After that, the 8006 aluminum alloy melt is introduced into the holding furnace for the next step.

[0059] The refined 8006 aluminum alloy melt is introduced into the holding furnace for refining, standing and slag removal, and then kept warm in the holding furnace; according to needs, after the 8006 aluminum alloy melt is introduced into the holding furnace, the 8006 aluminum alloy melt in the holding furnace is refined using a liquid refining agent of 100 ml / t aluminum, and 90 kg of solid cold material is added to the holding furnace before refining, and after refining, the furnace is allowed to stand for 10 minutes, and then the holding furnace is slag removed and heated, and the above refining operation is repeated every 4 hours, and finally the temperature of the holding furnace is controlled at 740°C;

[0060] b. Online refinement and purification steps during casting and rolling production: the 8006 aluminum alloy melt in the holding furnace is output to the double-plug launder 2 to which aluminum-titanium-boron wire can be added in reverse, and in particular, the adding speed of the aluminum-titanium-boron wire is 14.5 cm / min, and then the 8006 aluminum alloy melt passes through the degassing box and the filter box in sequence, and then flows out into the front box. In addition, the air supply pressure of the degassing box is 0.15 MPa, the flow rate is 18 L / min, and the volatile gas mixed with argon and liquid refining agent is introduced into the degassing box rotor, the rotor speed of the degassing box rotor is set to 550 rpm, and the temperature of the degassing box is set to 725°C;

[0061] c. Rolling steps during casting and rolling production: the 8006 aluminum alloy melt in the front box flows into the wide casting nozzle 1 through the flow channel, and then the 8006 aluminum alloy melt is divided in the wide casting nozzle 1, and then flows out from the liquid outlet nozzle 1.4 to the casting and rolling area of ​​the wide rolling mill, and finally the 8006 aluminum alloy melt is cooled and cast-rolled by the two casting rollers on the wide rolling mill; according to needs, the width of the two casting rollers on the wide rolling mill is 2300mm, the roller diameter of the casting roller is 1190mm, the roller convexity of the casting roller is 0.43mm, the roller gap of the casting roller is 3.95mm, and the length of the casting and rolling area is 63mm; and the rolling speed of the wide rolling mill is 730mm / min, the temperature of the cooling water used to cool the casting rollers on the wide rolling mill is 27°C, and the temperature of the front box is 697°C;

[0062] The width of the wide casting nozzle 1 is 2060 mm, and the wide casting nozzle 1 has two liquid inlets 1.1, and the number of diverter blocks inside the wide casting nozzle 1 is an odd number, and the multiple diverter blocks are divided into a central diverter block 1.2 and multiple surrounding diverter blocks 1.3, and the surrounding diverter blocks 1.3 on both sides of the central diverter block 1.2 are symmetrically arranged; the gap width between the central diverter block 1.2 and the two adjacent surrounding diverter blocks 1.3 is set to a, a = 9 mm, and the gap widths between the remaining two adjacent surrounding diverter blocks 1.3 are set to b1, b2, b3, respectively. 2、 …b x , and b x -b x-1 =b1-a+4*(x-1), b1-a=7mm, x=4; the distance between the central diverter block 1.2 and the end face where the liquid inlet 1.1 of the wide casting nozzle 1 is located is h, h=10mm, and the distances between the plurality of surrounding diverter blocks 1.3 and the end face where the liquid inlet 1.1 of the wide casting nozzle 1 is located are h1, h2, ... h x ;h x =h+6x, x=4;

[0063] d. The blank after casting and rolling is subjected to homogenization annealing, cold rolling, intermediate annealing, cold rolling, slitting and packaging to become the finished 8006 alloy container foil;

[0064] Embodiment 3 of this casting and rolling production method is

[0065] a. Melting steps before casting and rolling production:

[0066] 1) Add 50% of raw aluminum, 10% of scrap, and the rest is aluminum ingots into the smelting furnace, then heat the smelting furnace to 710°C, remove the slag, then start the permanent magnetic stirring, and continue to heat up. When the temperature reaches 747°C, stop heating;

[0067] 2) Then the aluminum melt in the smelting furnace is tested, and according to the test results, the various element components required to be added to the 8006 alloy are calculated and proportioned, and finally the chemical composition mass percentage of the melt in the smelting furnace is adjusted to: Fe: 1.5%, Si: 0.15%, Mn: 0.3%, Mg: 0.01%, Zn: 0.03%, Cu: 0.01%, Cd: 0.001%, Li: 0.0002%, Na: 0.0005%, Pb: 0.005%, Ti: 0.03%, and the rest is Al;

[0068] 3) When the sample is qualified after the test, it is 8006 aluminum alloy melt. The 8006 aluminum alloy melt is refined, left to stand and slag removed in the smelting furnace. In addition, the refining in the smelting furnace is carried out twice. The first time, the powder spray refining in the "N+Z" mode is adopted. Argon gas and 2 kg / t aluminum powder refining agent are mixed respectively, and then sprayed into the melt through the powder spray refining machine for refining. The refining time is 20 minutes, and the bubble height during refining is less than 200 mm. After the first refining, the 8006 aluminum alloy melt is left to stand for 10 minutes. minutes, and then slag removal is carried out; after slag removal is completed, the temperature is raised to 747℃ and the second refining is carried out. The second refining also adopts the "N+Z" mode, and the refining agent is set as a liquid refining agent of 110ml / t aluminum. The liquid refining agent is introduced into the melt through a liquid refining machine for refining operation. The refining time is 20min, and the bubble height during refining is less than 150mm. After the second refining is completed, it is allowed to stand for 10 minutes, and then slag removal is carried out. After that, the 8006 aluminum alloy melt is introduced into the holding furnace for the next step;

[0069] The refined 8006 aluminum alloy melt is introduced into the holding furnace for refining, standing and slag removal, and then kept warm in the holding furnace; according to needs, after the 8006 aluminum alloy melt is introduced into the holding furnace, the 8006 aluminum alloy melt in the holding furnace is refined using a liquid refining agent of 110 ml / t aluminum, and 120 kg of solid cold material is added to the holding furnace before refining, and after refining, the furnace is allowed to stand for 10 minutes, and then the holding furnace is slag removed and heated, and the above refining operation is repeated every 4 hours, and finally the temperature of the holding furnace is controlled at 745°C;

[0070] b. Online refinement and purification steps during casting and rolling production: the 8006 aluminum alloy melt in the holding furnace is output to the double-plug launder 2 to which aluminum-titanium-boron wire can be added in reverse, and in particular, the adding speed of the aluminum-titanium-boron wire is 16 cm / min, and then the 8006 aluminum alloy melt passes through the degassing box and the filter box in sequence, and then flows out into the front box. In addition, the air supply pressure of the degassing box is 0.18 MPa, the flow rate is 20 L / min, and the volatile gas mixed with argon and liquid refining agent is introduced into the degassing box rotor, the rotor speed of the degassing box rotor is set to 600 rpm, and the temperature of the degassing box is set to 730°C;

[0071] c. Rolling steps during casting and rolling production: the 8006 aluminum alloy melt in the front box flows into the wide casting nozzle 1 through the flow channel, and then the 8006 aluminum alloy melt is divided in the wide casting nozzle 1, and then flows out from the liquid outlet nozzle 1.4 to the casting and rolling area of ​​the wide rolling mill, and finally the 8006 aluminum alloy melt is cooled and cast-rolled by two casting rollers on the wide rolling mill; according to needs, the width of the two casting rollers on the wide rolling mill is 2500mm, the roller diameter of the casting roller is 1200mm, the roller convexity of the casting roller is 0.45mm, the roller gap of the casting roller is 4.0m, and the length of the casting and rolling area is 60mm; and the rolling speed of the wide rolling mill is 710mm / min, the cooling water temperature for cooling the casting rollers on the wide rolling mill is 28°C, and the temperature of the front box is 696°C;

[0072] The width of the wide casting nozzle 1 is 2150 mm, and the wide casting nozzle 1 has two liquid inlets 1.1, and the number of diverter blocks inside the wide casting nozzle 1 is an odd number, and the multiple diverter blocks are divided into a central diverter block 1.2 and multiple surrounding diverter blocks 1.3, and the surrounding diverter blocks 1.3 on both sides of the central diverter block 1.2 are symmetrically arranged; the gap width between the central diverter block 1.2 and the two adjacent surrounding diverter blocks 1.3 is set to a, a = 10 mm, and the gap widths between the remaining two adjacent surrounding diverter blocks 1.3 are set to b1, b2, and b3, respectively. 2、 …b x , and b x -b x-1 =b1-a+4*(x-1), b1-a=7mm, x=5; the distance between the central diverter block 1.2 and the end face where the liquid inlet 1.1 of the wide casting nozzle 1 is located is h, h=12mm, and the distances between the plurality of surrounding diverter blocks 1.3 and the end face where the liquid inlet 1.1 of the wide casting nozzle 1 is located are h1, h2, ... h x ;h x =h+6x, x=5;

[0073] d. After casting and rolling, the billet undergoes homogenization annealing, cold rolling, intermediate annealing, cold rolling, slitting and packaging to become the finished 8006 alloy container foil.

[0074] Parts of the present invention not described in detail are prior art.

Claims

1. A casting and rolling production method for wide width 8006 alloy container foil, characterized in that: It includes the following steps: a. Melting steps before casting and rolling production: 1) Add 40-50% raw aluminum, 10% scrap, and the rest is aluminum ingots into the smelting furnace, then heat the smelting furnace to 700±10℃, remove the scum, then start the permanent magnetic stirring, and continue to heat up. When the temperature reaches 745±2℃, stop heating; 2) Then the aluminum melt in the smelting furnace is tested, and according to the test results, the various element components required to be added to the 8006 alloy are calculated and proportioned, and finally the chemical composition mass percentage of the melt in the smelting furnace is adjusted to: Fe: 1.2-1.5%, Si: 0.10-0.15%, Mn: 0.3-0.6%, Mg: ≤0.01%, Zn: ≤0.03%, Cu: ≤0.01%, Cd: ≤0.001%, Li: ≤0.0002%, Na: ≤0.0005%, Pb: ≤0.005%, Ti: 0.02-0.03%, and the rest is Al; 3) When the sample is qualified after the test, it is 8006 aluminum alloy melt. After the 8006 aluminum alloy melt is refined, allowed to stand and deslagging in the smelting furnace, it is introduced into the holding furnace for refining, standing and deslagging again, and then kept warm in the holding furnace; b. Online refinement and purification step during casting and rolling production: the 8006 aluminum alloy melt in the holding furnace is output to a double-plug launder (2) to which aluminum-titanium-boron wire can be added in reverse, and then the 8006 aluminum alloy melt passes through a degassing box and a filter box in sequence and flows out into the front box; The double-insert plate flow trough (2) comprises a trough body (2.1) for aluminum liquid to flow, two insert plates (2.2) and a flow block (2.5): the trough body (2.1) is in a "U" shape, and a insert plate (2.2) perpendicular to the aluminum liquid flow direction in the trough body (2.1) is respectively provided at the liquid inlet end and the liquid outlet end of the inner cavity of the trough body (2.1), and the gap between the bottom of the two insert plates (2.2) and the inner bottom surface of the trough body (2.1) is respectively set as a liquid inlet hole (2. 3) and a liquid outlet hole (2.4); a flow block (2.5) is provided on the inner bottom surface of the tank body (2.1), the flow block (2.5) is located between the two plug plates (2.2), and the flow block (2.5) is a structure with a high middle and low ends, the slopes at the two ends of the flow block (2.5) respectively correspond to the liquid inlet hole (2.3) and the liquid outlet hole (2.4), and the height of the flow block (2.5) is greater than the height of the liquid inlet hole (2.3) and the liquid outlet hole (2.4); c. Rolling steps during casting and rolling production: the 8006 aluminum alloy melt in the front box flows into the wide casting nozzle (1) through the flow channel, and then the 8006 aluminum alloy melt is divided in the wide casting nozzle (1) and flows out from the liquid outlet nozzle (1.4) to the casting and rolling area of ​​the wide rolling mill, and finally the 8006 aluminum alloy melt is cooled and cast-rolled by two casting rollers on the wide rolling mill; The width of the wide casting nozzle (1) is greater than 2000 mm, and the wide casting nozzle (1) has two liquid inlets (1.1), and the number of diverter blocks inside the wide casting nozzle (1) is an odd number, the plurality of diverter blocks are divided into a central diverter block (1.2) and a plurality of peripheral diverter blocks (1.3), and the peripheral diverter blocks (1.3) on both sides of the central diverter block (1.2) are symmetrically arranged; the gap width between the central diverter block (1.2) and two adjacent peripheral diverter blocks (1.3) is set to a, a=8-10 mm, and the gap widths between the remaining two adjacent peripheral diverter blocks (1.3) are set to b1, b2, ... b in sequence. x , and b x -b x-1 =b1-a+4*(x-1), b1-a=6-7mm, x≤5; the distance between the central diverter block (1.2) and the end face where the liquid inlet (1.1) of the wide casting nozzle (1) is located is h, h=8-12mm, and the distances between the plurality of surrounding diverter blocks (1.3) and the end faces where the liquid inlet (1.1) of the wide casting nozzle (1) is located are h1, h2, ... h x ;h x =h+6x, x≤5; d. After casting and rolling, the billet undergoes homogenization annealing, cold rolling, intermediate annealing, cold rolling, slitting and packaging to become the finished 8006 alloy container foil.

2. The casting and rolling production method of wide width 8006 alloy container foil according to claim 1, characterized in that: The content of Fe+Mn in the 8006 aluminum alloy melt does not exceed 1.90%.

3. The casting and rolling production method of wide width 8006 alloy container foil according to claim 1, characterized in that: The refining in the smelting furnace is carried out twice. The first refining adopts the "N+Z" mode of powder refining. After argon and 2kg / t aluminum powder refining agent are mixed respectively, they are sprayed into the melt through a powder refining machine for refining. The refining time is 18±2min, and the bubble height during refining is less than 200mm. After the first refining, the 8006 aluminum alloy melt is allowed to stand for 10 minutes, and then slag is removed. After the slag removal is completed, the temperature is raised to 745±2℃ and the second refining is carried out. The second refining also adopts the "N+Z" mode, and the refining agent is set to a liquid refining agent of 100±10ml / t aluminum. The liquid refining agent is introduced into the melt through a liquid refining machine for refining operation. The refining time is 18±2min, and the bubble height during refining is less than 140±10mm. After the second refining is completed, it is allowed to stand for 10 minutes, and then slag is removed. After that, the 8006 aluminum alloy melt is introduced into the insulation furnace for the next step.

4. The casting and rolling production method of wide width 8006 alloy container foil according to claim 1, characterized in that: After the 8006 aluminum alloy melt is introduced into the holding furnace, the 8006 aluminum alloy melt in the holding furnace is refined using a liquid refining agent of 100±10ml / t aluminum, and 80-120kg of solid cold material is added to the holding furnace before refining. After refining, the furnace is allowed to stand for 10 minutes, and then the holding furnace is deslagging and heated, and the above refining operation is repeated every 4-4.5h, and finally the temperature of the holding furnace is controlled at 735-745°C.

5. The casting and rolling production method of wide width 8006 alloy container foil according to claim 4, characterized in that: Each time after the 8006 aluminum alloy melt is introduced into the holding furnace, the holding furnace needs to be refined once using a liquid refining agent.

6. The casting and rolling production method of wide width 8006 alloy container foil according to claim 1, characterized in that: The gas supply pressure of the degassing box is greater than 0.15MPa, the flow rate is greater than 18L / min, and the volatile gas mixed with argon and liquid refining agent is introduced into the degassing box rotor. The rotor speed of the degassing box rotor is set to 500-600rpm, and the temperature of the degassing box is set to 720-730℃.

7. The casting and rolling production method of wide width 8006 alloy container foil according to claim 1, characterized in that: The speed of adding the aluminum titanium boron wire into the double-plug plate flow channel (2) is 13-16 cm / min.

8. The casting and rolling production method of wide width 8006 alloy container foil according to claim 1, characterized in that: During casting and rolling production, the width of the two casting rollers on the wide-width rolling mill is 2300-2500mm, the roller diameter of the casting roller is 1180-1200mm, the roller crown of the casting roller is 0.40-0.45mm, the roller gap of the casting roller is 3.9-4.0mm, and the length of the casting and rolling zone is 60-65mm.

9. The casting and rolling production method of wide width 8006 alloy container foil according to claim 1, characterized in that: During casting and rolling production, the rolling speed of the wide rolling mill is 730±20 mm / min, the temperature of the cooling water used to cool the casting rolls on the wide rolling mill is 25-30°C, and the temperature of the front box is 695-700°C.

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