Method for producing 1235 alloy cable aluminum foil by using continuous casting and rolling blank

Abstract

The invention belongs to the technical field of aluminum processing, and particularly discloses a method for producing a 1235 alloy cable aluminum foil by using a continuous casting and rolling blank, which comprises the following steps of: rolling the blank by a three-stand continuous rolling mill without cooling and surface milling, performing cold rolling, trimming and intermediate annealing, and performing multi-pass rolling by an aluminum foil rolling mill until the thickness of a finished product is reached, thereby obtaining the 1235 alloy cable aluminum foil. The processing flow is shortened, the metal manufacturing time is shortened, the energy consumption is reduced, after the aluminum foil finished product produced by the continuous casting and rolling blank is annealed, the mechanical property can be stably controlled within the tensile strength of 70-90 MPa, the performance of the finished product is more stable than that of a material produced by a cast rolling method, and the grain structure of the finished product is finer and more uniform than that of the material produced by the cast rolling method.

Description

Technical Field

[0001] The present invention belongs to the technical field of aluminum processing, and specifically discloses a method for producing 1235 alloy cable aluminum foil with continuous casting and rolling billets. Background Art

[0002] In the field of aluminum processing, with the continuous development of current casting-rolling, cold rolling, annealing, and finishing technologies, using casting-rolling billets to produce cable aluminum foil has become the mainstream. The cable aluminum foil produced with casting-rolling billets basically meets the strict requirements of cable aluminum foil in terms of mechanical properties, surface quality, dimensional accuracy, etc. Although the casting-rolling billets have many advantages in producing cable foil, there are also some disadvantages, mainly including the following aspects: The cooling rate is relatively fast during the casting-rolling process, which may cause defects such as segregation, pores, and inclusions in the casting-rolling billets. These defects will affect the mechanical properties and electrical conductivity of the cable foil and reduce the product quality; There may be defects such as oxide scales, scratches, and roll marks on the surface of the casting-rolling billets. Although surface treatment will be carried out during the subsequent processing, some subtle defects may still remain, affecting the appearance quality and surface flatness of the cable foil and imposing certain limitations on its application in the high-end cable field; During the production process of casting-rolling billets, due to the too-fast solidification rate of the molten metal, the distribution of alloying elements in the casting billets is not uniform enough, which may lead to differences in the properties of the cable foil at different positions. For some cable foils with extremely high requirements for composition uniformity, the casting-rolling billets may be difficult to fully meet the requirements; The processing performance of the casting-rolling billets is relatively limited. During the subsequent rolling process, due to the characteristics of their internal structure and stress state, relatively complex rolling processes and multiple intermediate annealings may be required to achieve the thickness and performance requirements of the cable foil, which prolongs the production cycle and increases the production cost.

[0003] Conventional 1235 alloy cable aluminum foil products are produced with casting-rolling billets. For example, Patent CN 103084805 B discloses a production process for 1235 double-zero foil. The specific process flow is: melting → casting-rolling → cold rolling → homogenization annealing → cold rolling → secondary annealing → cold rolling → trimming → foil rolling → slitting → final annealing → inspection and packaging. The existing process requires two intermediate annealings, with high production costs and long in-process time. In addition, since the thickness of the casting-rolling billets is between 6.0 and 7.0 mm, there are many subsequent rolling passes in this production method, resulting in high production energy consumption and high production costs.

[0004] The prior art CN 113305149 A discloses a manufacturing method for the primary intermediate annealing of a double-zero aluminum foil blank suitable for AA8079 aluminum alloy. The specific process is: melting → continuous casting and rolling → cold rough rolling → homogenization annealing → cold intermediate rolling → aluminum foil rough and intermediate rolling → double combination → aluminum foil finish rolling → slitting → finished product annealing. Our company once tried to use this method to produce 1235 alloy cable aluminum foil, but this method is not feasible. From the perspective of the professional technology in this industry, there are the following disadvantages in the production by this primary annealing method: (1) The continuously cast and rolled blank formed by continuous casting and rolling is cooled to room temperature. The continuously cast and rolled blank cooled to room temperature is rolled on a cold rolling mill to a thickness of 0.5 - 1.0 mm, and the blank formed by cold rough rolling is annealed at 460 - 540 °C. This method produces single-sided bright aluminum foil, and there is a great risk of dark surface bright spots during the double combination rolling of the finished product. This defect will cause the material to be scrapped; (2) When producing single-sided bright materials according to this process, the rolling force during the double combination rolling of the finished product is large, and the production is extremely unstable and prone to breaking the strip; (3) This method uses a primary annealing scheme, which seems to be more convenient in process, but in fact, due to reducing one intermediate annealing, two rolling passes need to be added, and the production cost is higher; (4) For the 1235 alloy aluminum foil produced by this method, the performance of the field frequency annealing fluctuates greatly, the performance of the finished product is extremely unstable, and the elongation is low, posing a quality hazard. Summary of the Invention

[0005] In order to solve the problems in the background technology, the present invention discloses a method for producing 1235 alloy cable aluminum foil with a continuous casting and rolling blank. Without going through the cooling and milling process, the blank is rolled by a three-stand continuous rolling mill, and then through cold rolling, trimming and intermediate annealing processes, it is multi-pass rolled to the finished product thickness by an aluminum foil rolling mill, and finally slit, annealed and packaged, shortening the processing flow, reducing the in-process time of the metal, and reducing energy consumption.

[0006] To achieve the above invention purpose, the present invention adopts the following technical solutions: A method for producing 1235 alloy cable aluminum foil with a continuous casting and rolling blank, comprising the following steps: S1. Melting: Add raw materials into a tilting furnace, heat and stir to melt the melt in the tilting furnace. After the furnace charge is leveled, add metal additives into the tilting furnace and stir evenly. The weight percentage content of each component in the alloy is as follows: Si = 0.08% - 0.12%, Fe = 0.48% - 0.53%, Cu ≤ 0.05%, Mn ≤ 0.05%, Mg ≤ 0.02%, Cr ≤ 0.01%, Zn ≤ 0.05%, Ti ≤ 0.025%, and the balance is Al. After the alloy composition ratio is qualified, pass argon and refining agent into the melt surface in the furnace through the high-speed rotation of the refining machine for degassing and slag removal treatment. After the refining is completed, skim off the floating slag. After the slag skimming is completed, let the melt stand for more than 0.5 h to prepare for tapping the furnace; S2. Casting: Start the furnace, that is, control the tilting furnace to lift the angle to make the aluminum alloy melt enter the launder evenly and smoothly, and the evenly flowing aluminum alloy melt passes through the on-line titanium wire addition and the on-line degassing box for degassing in sequence, then enters the plate filter box for filtration, and then is injected into the casting cavity of the casting machine equally and evenly through the casting nozzle, and then the billets with different widths and a thickness of 19 mm are exported through the outlet of the casting cavity; S3. Three-stand tandem rolling: The billets obtained in step S2 enter the loop table through the pinch rolls of the casting machine, are cooled by emulsion spraying, and then enter the pinch rolls of the three-stand tandem rolling mill and are rolled through three stands in sequence; S4. Cold rolling: The billets after three-stand tandem rolling in step S3 are rolled in multiple passes on the cold rolling blooming mill to obtain cold-rolled coils with a thickness of 0.45 mm; S5. Slitting: After slitting, the width tolerance of the material is less than ±1 mm, and there should be no aluminum powder accumulation at the edges; S6. Intermediate annealing: The coil after slitting in step S5 is suspended in the annealing furnace. The temperature of the annealing furnace is raised to 530 °C in 4 h and held for 10 - 20 h, then the furnace temperature is adjusted to 480 °C and held for 5 h, and finally the side cooling is opened, the furnace temperature is lowered to 170 °C and held for 2 h, and then taken out of the furnace; S7. Foil rolling: The coil after intermediate annealing in step S6 is rolled in multiple passes on the aluminum foil rolling mill to the finished thickness; S8. Finished product slitting: The slitting misalignment is less than 0.5 mm, and the finished product material after slitting is directly placed in the frame and suspended on the suspension rack; S9. Finished product annealing: After the material slitting is completed, the slitted material is loaded into the annealing material frame according to the framing requirements and placed in the annealing furnace. The temperature of the annealing furnace is raised to 230 °C in 4 h and held for 20 h. During the holding period, it operates under negative pressure. After the annealing process is completed, it is taken out of the furnace. After the material naturally cools to room temperature and is inspected to be qualified, it is packaged according to the packaging requirements.

[0007] Furthermore, in the method for producing 1235 alloy cable aluminum foil with continuous casting and rolling billets, in the furnace starting process in step S2, the melt temperature is: 745 °C - 755 °C, the hydrogen content in the melt is below 0.2 ml / 100 g·Al, and the hydrogen content in the aluminum alloy melt after on-line treatment is below 0.12 ml / 100 g·Al.

[0008] Furthermore, in the method for producing 1235 alloy cable aluminum foil with continuous casting and rolling billets, in step S2 during the production of the casting machine, the front box temperature is 687 °C - 693 °C, the casting speed is 6.5 - 7.5 m / min, the torque of the casting machine pinch rolls is 4.0 - 7.0 N*N, and the billet temperature at the outlet of the casting cavity is 520 - 580 °C.

[0009] Further, in the method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets, during the in-machine three-stand rolling in step S3, the thickness at the outlet of the first stand is 8 - 9 mm, the rolling force is 400 - 600 t, the rolling inlet temperature is 450 - 500 °C, and the outlet temperature is 380 - 430 °C; the thickness at the outlet of the second stand is 4 - 5 mm, the rolling force is 250 - 450 t, the rolling inlet temperature is 350 - 400 °C, and the outlet temperature is 290 - 340 °C; the thickness at the outlet of the third stand is 2 - 2.5 mm, the rolling force is 150 - 300 t, the rolling inlet temperature is 250 - 300 °C, and the outlet temperature is 160 - 210 °C.

[0010] Further, in the method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets, during the cold rolling in step S4, the roll crown is controlled at a convexity of +0.04 mm and a roughness of 0.65 μm. During the rolling process, the temperature of the rolling oil is 35 - 45 °C. The thickness of each rolling pass is as follows: (2 - 2.5) mm → 1.2 mm → 0.75 mm → 0.45 mm.

[0011] Further, in the method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets, before the longitudinal shearing and trimming in step S5, check whether there are foreign objects on the guide roller path and whether the guide rollers rotate flexibly. Before threading, each guide roller in the guide path must be wiped with alcohol; during the production process, strictly inspect the surface quality of the material, and ensure that there are no surface defects such as imprints, sticking aluminum, abrasions, and / or scratches on the surface of the aluminum coil, and there are no burrs, tower shapes, wavy edges, and / or small edge wrinkles at the end faces.

[0012] Further, in the method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets, the specific rolling passes in step S7 are 0.45 mm → 0.22 mm → 0.09 mm → 0.045 mm → 0.021 mm → 0.009 mm, where the last rolling pass is double-rolling.

[0013] Further, in the method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets, in step S9, the tensile strength of the finished product is 70 - 90 Mpa, and the elongation is ≥2%.

[0014] Further, in the method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets, before the finished product packaging in step S9, inspect the indicators of the material thickness, width, end face quality, surface quality, water brushing, pinhole, and unwindability, and take samples to detect the mechanical properties of the cut material. During packaging, wrap with EPE and plastic film in sequence, and put a desiccant before tying the plastic film. After the aluminum foil is wrapped with the plastic film, put it into a wooden box, cover the wooden box lid, and use plastic steel straps to pack the wooden box to complete the packaging.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The production of cable foil blanks by conventional processes requires two annealing processes using cast-rolled materials. However, in the present invention, the continuous casting and rolling billets only need to be subjected to one intermediate annealing at a thickness of 0.45 mm to complete the process. This process can directly reduce one intermediate annealing, reduce the annealing energy consumption by about 200 kwh / t, and reduce the metal processing time by more than 5 days. 2. The production of cable foil blanks by conventional processes requires the use of cast-rolled materials, and the thickness of the billets is basically about 7.0 mm. However, in the present invention, the thickness of the continuous casting billets is 19 mm, and the thickness of the billets after triple rolling is 2 - 2.5 mm. The total number of cold rolling and foil rolling passes is two passes less than that of the conventional process, reducing the annealing energy consumption by about 300 kwh / t and saving 10 kg / t of rolling oil consumption. 3. After annealing the aluminum foil products produced from the continuous casting and rolling billets of the present invention, the mechanical properties can be stably controlled between a tensile strength of 70 - 90 MPa and an elongation rate of ≥2%. The properties of the finished products are more stable than those produced by the cast-rolling method, and the grain structure of the finished products is finer and more uniform than that of the materials produced by the cast-rolling method. 4. Compared with the method of CN113305149A which requires eleven rolling passes, the production of aluminum foil using the continuous casting and rolling billets of the present invention only requires eight rolling passes. Moreover, the production cost of triple rolling of the continuous casting and rolling billets is low. During subsequent processing and production, due to the small deformation resistance, it is easier to process. And the present invention uses one annealing production without increasing the number of rolling passes. The grains of the continuous casting and rolling billets are more uniform and finer, and the quality of the finished products is much finer and of better quality than the dark side of the 1235 alloy aluminum foil products produced by the method of CN113305149A. Detailed Embodiments

[0016] To better understand the present invention, the content of the present invention will be further clearly elaborated below in conjunction with embodiments. However, the protected content of the present invention is not limited to the following embodiments. In the following description, a large number of specific details are given to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details.

[0017] The overall process flow of the method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets in the present invention: melting - casting - triple rolling - cold rolling - longitudinal shearing and edge trimming - intermediate annealing - foil rolling - finished product slitting - finished product annealing - inspection and packaging. The specific steps are as follows: S1. Melting: Four 120t American Bricmont tilting furnaces are used for smelting. Raw materials are added into the tilting furnace, and the melt in the furnace is melted by combustion and heating of four natural gas burners in the furnace. During the melting process, electromagnetic stirring should be turned on to ensure that the melt in the furnace will not be overburned or segregated. After the charge is leveled, the casting mold is sampled to test the alloy composition. According to the test results and the weight of the melt in the furnace, metal additives such as iron agent, quick-dissolving silicon, copper agent, manganese agent, and titanium agent are added. Electromagnetic stirring is turned on and stirred evenly. The weight percentage content of each component in the alloy is as follows: Si 0.10%, Fe 0.51%, Cu 0.02%, Mn 0.01%, Mg0.01%, Cr 0.005%, Zn 0.01%, Ti 0.02%, the remainder is Al. After the alloy composition ratio is qualified, high-purity argon and refining agent are introduced into the melt surface of the furnace by using HD2000 refining machine at high speed for degassing and slag removal to meet the requirements of clean and clean aluminum alloy melt. After refining, the scum is scraped off to ensure that the surface of the melt presents a mirror-like shape of aluminum liquid. No residue is allowed to remain to prevent secondary contamination of the melt after hydrogen absorption. After the slag is scraped off, the melt is left to stand for more than 0.5h to prepare for starting the furnace. It should be noted here that the metal additives, argon and refining agent in this step are all commercially available conventional reagents; S2, casting: furnace starting, i.e. controlling the lifting angle of the tilting furnace so that the aluminum alloy melt that has been treated in the furnace can enter the flow channel at a uniform and stable speed. During the furnace starting process, the melt temperature is 745℃-755℃, and the hydrogen content in the melt is below 0.2ml / 100g·Al. To ensure the uniform flow rate of the aluminum alloy melt, the liquid level height fluctuation shall not exceed 20mm. The aluminum alloy melt that flows out at a uniform speed is successively degassed by online titanium wire addition and online degassing box, and then enters the plate filter box for filtration. 1.2-1.7g titanium wire is added per ton of melt, and high-purity argon is introduced into the degassing box. The rotor speed of the degassing box is 460r / min, and the argon pressure is 0.8mpa. Two 50ppm ceramic filter plates are placed in the filter box. The hydrogen content of the aluminum alloy melt that has been treated online is below 0.12ml / 100g·Al; The melt after online treatment is injected into the front box of the casting machine through the casting nozzle in equal amounts and at a uniform speed for casting, and then the billet with different widths and a thickness of 19mm is led out through the casting cavity outlet. The casting cavity is composed of two steel belts rotating in opposite directions and edge graphite blocks. The two sides of the steel belts are closed by edge blocks sprayed with graphite insulation layers to form a rectangular closed space of the casting cavity. The two steel belts isolate the melt from the high-speed sprayed cooling water between the upper and lower frames, so that the heat of the melt can be quickly taken away by the cooling water. When the casting machine is in production, the front box temperature is 687℃-693℃, the casting speed is 7.0m / min, and the casting machine pinch roller torque is 4.0~7.0N*N. By adjusting the pressure and flow of cooling water, the temperature of the front box and the casting machine speed and other parameters, the billet temperature at the casting cavity outlet is ensured to be: 495℃-555℃; S3. Three-stand tandem rolling: After the billet comes out of the caster in step S2, it enters the loop table through the pinch rolls of the caster, and then enters the pinch rolls of the rolling mill. The loop table can adjust the angle of the billet entering the rolling mill, enabling the billet to enter the three-stand tandem rolling mill in a parabolic form for continuous rolling. The two sets of pinch rolls cooperate to isolate the mutual influence of the tension between the caster and the three-stand tandem rolling mill, ensuring that the two devices are completely unaffected. In the loop table section, to ensure the cooling of the casting slab and avoid abnormal aluminum sticking when entering the three-stand rolling, emulsion is arranged to spray the billet to play a role in cooling the billet. During the three-stand rolling in the mill, the thickness at the outlet of the first stand is 8.5 mm, the rolling force is 520 t, the rolling inlet temperature is 480 °C, and the outlet temperature is 420 °C; the thickness at the outlet of the second stand is 4.5 mm, the rolling force is 320 t, the rolling inlet temperature is 380 °C, and the outlet temperature is 310 °C; the thickness at the outlet of the third stand is 2.3 mm, the rolling force is 190 t, the rolling inlet temperature is 280 °C, and the outlet temperature is 190 °C. S4. Cold rolling: The 2.3-mm billet produced by the aforementioned continuous casting and rolling is rolled in multiple passes on a cold rolling blooming mill to obtain a cold-rolled coil with a thickness of 0.45 mm. The roll crown is controlled at a convexity of +0.04 mm and a roughness of 0.65 µm. 100# rolling oil is used, and the content of the rolling oil additive is controlled at about 7%. During the rolling process, the temperature of the rolling oil is 35 - 45 °C. The thickness of each rolling pass is as follows: 2.3 mm → 1.2 mm → 0.75 mm → 0.45 mm. S5. Slitting and edge trimming: Before slitting and edge trimming, check whether there are foreign objects on the guide roller path and whether the guide rollers rotate flexibly. Before threading, each guide roller in the guide path must be wiped with alcohol; during production, strictly check the surface quality of the material to ensure that there are no surface defects such as imprints, aluminum sticking, scratches, and / or scuffs on the surface of the aluminum coil, and there are no burrs, tower shapes, flanging, and / or small edge ripples at the end face. After edge trimming, the width tolerance of the material is less than ±1 mm, and there should be no aluminum powder accumulation at the edges. S6. Intermediate annealing: During intermediate annealing, place the material on the annealing rack to ensure that the material is suspended throughout the processes of transfer, annealing, and cooling to avoid indentation and bruising of the material. In addition, before annealing, two steel belts should be tied horizontally and vertically to the coil to ensure that there will be no loose layers during the processes of transfer, annealing, and cooling of the material, so as to prevent sticking damage problems. Arrange four coils of the same specification and the same coil weight as one furnace for annealing. The annealing process is as follows: Raise the annealing furnace temperature to 530 °C in 4 h and hold for 18 h, then adjust the furnace temperature to 480 °C and hold for 5 h, and finally open the side cooling, lower the furnace temperature to 170 °C and hold for 2 hours before taking out of the furnace. Before each annealing furnace charging, check the equipment status of the annealing furnace to ensure that the positive pressure intake pipe is facing the center of the circulation fan, the thermocouple is not bent or damaged, the protective mesh cover of the circulation fan has no scattered aluminum foil blockage, there is no abnormality in the positive and negative pressure fans and the circulation fan on the furnace top, and there is no water leakage in the cooling water pipe of the circulation fan bearing. S7. Foil lacing: Before rolling, wipe the outlet flattening roller with alcohol or rolling oil to make the flattening roller show the natural color of the rubber coating. At the same time, rotate the flattening roller to check whether there is any phenomenon of rubber bursting. When threading the strip, remove the outermost layer of the aluminum coil as waste to prevent the rust of the steel strip from entering the roll gap and damaging the roll, resulting in aluminum sticking, imprints, etc. The aluminum coil is rolled through multiple passes in the aluminum foil rolling mill to the finished thickness. The specific rolling passes are 0.45 mm → 0.22 mm → 0.095 mm → 0.042 mm → 0.02 mm → 0.009 mm. Among them, the last rolling pass is double-sheet rolling. For each rolling pass, use a stroboscope to check the surface quality. After each rolling pass, check whether there are periodic defects in the surface quality of one rolling cycle of the roll. If any abnormality is found, immediately change the roll. Before rolling the finished product, calibrate the thickness gauge to ensure that the thickness of the rolled finished product is normal. At the same time, adjust the blowing angle and air volume of the air outlet to ensure that there are no oil spots on the rolled material. The rolling parameters shall be implemented in accordance with the relevant process standards to ensure the quality of the rolled finished product; S8. Finished product slitting: When slitting the finished product, it is necessary to clean and wipe each guide roller in the guide path with alcohol; ensure that there are no imprints, aluminum sticking, scratches, or abrasions on the surface of the finished product material, and there are no burrs, tower shape, wavy edges, or small edge wrinkles on the end face. The slitting misalignment must be less than 0.5 mm, and there are no bumps or abrasions on the end face of the small coil after slitting; mark the batch number and specifications on the surface of the slit small coil with a marker pen; directly place the finished product material into the suspended frame of the frame and do not allow it to fall directly to the ground; S9. Finished product annealing: After the material slitting is completed, load the slit material into the annealing material frame according to the framing requirements. Before hoisting the finished product annealing, check whether the sealing of the incoming material surface is firm, check whether there are any bruises on the surface and end face, check the furnace condition of the annealing furnace before entering the furnace, whether there is aluminum foil sticking to the circulating fan cover on the furnace top, check whether the cooling water ring of the furnace door leaks, and check whether there is dew on the annealing furnace top. Only when the above inspections are normal can the material enter the furnace for annealing. The specific finished product annealing process is as follows: Heat the annealing furnace to 230 °C in 4 h and keep it warm for 20 h. Keep negative pressure operation during the warming process. After the annealing process is completed, the furnace can be unloaded, and wait for the material to cool naturally to room temperature; Inspection of Packaging: Before the finished product is packaged, check whether the indicators of the material thickness, width, end face quality, surface quality, water brushing, pinhole situation, and unfoldability meet the quality standards, and take samples to detect the mechanical properties of the cut material. For a single-layer aluminum foil coil with a thickness of 0.009 mm, the tensile strength is 78 Mpa, the elongation rate is 2.9%, and the surface wettability is Class A. In the prior art CN113305149A, the tensile strength of the finished product is 90-110 MPa, and the elongation rate is ≥2.0%. Due to the requirements of the cable usage scenario, the cable needs to be fully wound in a limited space in various ways. The soft aluminum foil is easier to bend and wind. During the cable production process, it can be more conveniently wrapped around the cable core, adapting to different shapes and sizes of cable structures. When the cable is laid, it can also be better arranged along the line direction, reducing the installation difficulties caused by the hard aluminum foil and the damage to other parts of the cable. In addition, the soft aluminum foil can better fit with the cable core and other shielding layers, reducing the gaps and air layers, thereby improving the shielding effect against electromagnetic interference and ensuring the stability and quality of the cable transmission signal. Therefore, it is required that the aluminum foil has soft properties, that is, the tensile strength should be low. Therefore, the aluminum foil produced by our company's solution is more suitable for producing cables. After passing the inspection, it is wrapped with EPE and plastic film in sequence, and a desiccant is placed before tying the plastic film. After the aluminum foil is wrapped with the plastic film, it is placed in a wooden box, and the wooden box cover is placed and the wooden box is tied with a plastic steel belt to complete the packaging.

[0018] The present invention uses a Hazelett caster to produce a 19-mm-thick billet of 1235 alloy. Without passing through the cooling and milling process, the billet is rolled to a thickness of 2.3 mm by a three-stand continuous rolling mill, and then through the cold rolling production process of rolling, trimming, and intermediate annealing processes, it is rolled into the finished product thickness in multiple passes by aluminum foil rolling. Finally, it is subjected to finished product slitting and annealing before packaging, shortening the production cycle and reducing the production cost.

[0019] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Any other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solutions of the present invention shall be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets, characterized in that, It includes the following steps: S1. Melting: Add raw materials into the tilting furnace, heat and stir to melt the melt in the tilting furnace. After the furnace charge is leveled, add metal additives into the tilting furnace and stir evenly. The weight percentage content of each component in the alloy is as follows: Si = 0.08% - 0.12%, Fe = 0.48% - 0.53%, Cu ≤ 0.05%, Mn ≤ 0.05%, Mg ≤ 0.02%, Cr ≤ 0.01%, Zn ≤ 0.05%, Ti ≤ 0.025%, and the balance is Al. After the alloy composition ratio is qualified, pass argon and refining agent into the molten liquid surface in the furnace at high speed through the refining machine for degassing and slag removal treatment. After the refining is completed, skim off the floating slag. After the slag skimming is completed, let the melt stand for more than 0.5 h to prepare for lifting the furnace; S2. Casting: Lift the furnace, that is, control the tilting angle of the tilting furnace to make the aluminum alloy melt enter the launder evenly and smoothly. The aluminum alloy melt flowing out evenly passes through the on-line titanium wire addition and the on-line degassing box for degassing, then enters the plate filter box for filtration, and then is injected into the casting cavity of the casting machine equally and evenly through the casting nozzle, and then the casting blank with a thickness of 19 mm and unequal widths is exported through the outlet of the casting cavity; S3. Three-stand continuous rolling: The casting blank obtained in step S2 enters the loop table through the pinch roll of the casting machine, is cooled by emulsion spraying, and then enters the pinch roll of the three-stand continuous rolling mill and is rolled through three stands in turn; S4. Cold rolling: The billet after three-stand continuous rolling in step S3 is rolled in the cold rolling blooming mill for multiple passes to obtain a cold rolled coil with a thickness of 0.45 mm; S5. Longitudinal shearing and trimming: After trimming, the width tolerance of the material is less than ±1 mm, and there should be no aluminum powder accumulation at the edges; S6. Intermediate annealing: Suspend the coil after longitudinal shearing and trimming in step S5 in the annealing furnace. Heat the annealing furnace temperature to 530 °C in 4 h and keep it warm for 10 - 20 h. Then adjust the furnace temperature to 480 °C and keep it warm for 5 h. Finally, open the side cooling, lower the furnace temperature to 170 °C and keep it warm for 2 h, and then take it out of the furnace; S7. Foil rolling: The coil after intermediate annealing in step S6 is rolled in the aluminum foil rolling mill for multiple passes to the finished thickness; S8. Finished product slitting: The slitting stagger is less than 0.5 mm, and the finished product material after slitting is directly placed in the frame and suspended on the rack; S9. Finished product annealing: After the material slitting is completed, load the slit material into the annealing material frame according to the framing requirements and place it in the annealing furnace. Heat the annealing furnace to 230 °C in 4 h and keep it warm for 20 h. Keep negative pressure operation during the heat preservation. After the annealing process is completed, take it out of the furnace. Wait for the material to cool naturally to room temperature. After inspection and qualification, package it according to the packaging requirements.

2. The method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets according to claim 1, characterized in that, During the furnace lifting process in step S2, the melt temperature is: 745 °C - 755 °C, the hydrogen content in the melt is below 0.2 ml / 100 g·Al, and the hydrogen content in the aluminum alloy melt after on-line treatment is below 0.12 ml / 100 g·Al.

3. The method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets according to claim 1, characterized in that, During the production of the casting machine in step S2, the front box temperature is 687 °C - 693 °C, the casting speed is 6.5 - 7.5 m / min, the torque of the pinch roll of the casting machine is 4.0 - 7.0 N*N, and the temperature of the casting blank at the outlet of the casting cavity is 520 - 580 °C.

4. The method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets according to claim 1, characterized in that, During the in-machine three-stand rolling in step S3, the thickness at the exit of the first stand is 8 - 9 mm, the rolling force is 400 - 600 t, the rolling inlet temperature is 450 - 500 °C, and the exit temperature is 380 - 430 °C; the thickness at the exit of the second stand is 4 - 5 mm, the rolling force is 250 - 450 t, the rolling inlet temperature is 350 - 400 °C, and the exit temperature is 290 - 340 °C; the thickness at the exit of the third stand is 2 - 2.5 mm, the rolling force is 150 - 300 t, the rolling inlet temperature is 250 - 300 °C, and the exit temperature is 160 - 210 °C.

5. The method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets according to claim 1, characterized in that, During the cold rolling in step S4, the roll crown is controlled at a crown of +0.04 mm and a roughness of 0.65 um. During the rolling process, the temperature of the rolling oil is 35 - 45 °C. The rolling thickness for each pass is as follows: (2 - 2.5) mm → 1.2 mm → 0.75 mm → 0.45 mm.

6. The method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets according to claim 1, characterized in that, Before the longitudinal shearing and edge trimming in step S5, check whether there are foreign objects on the guide roller path, and check whether the guide rollers rotate flexibly. Before threading, each guide roller in the guide path must be wiped with alcohol; during the production process, strictly check the surface quality of the material, and ensure that there are no surface defects such as imprints, sticking aluminum, scratches and / or abrasions on the surface of the aluminum coil. Burrs, tower shape, lacy edge and / or small edge waves are not allowed at the end face.

7. The method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets according to claim 1, characterized in that, The specific rolling passes in step S7 are 0.45 mm → 0.22 mm → 0.09 mm → 0.045 mm → 0.021 mm → 0.009 mm. Among them, the last rolling pass is double-sheet rolling.

8. The method for producing 1235 alloy cable aluminum foil from continuous casting and rolling billets according to claim 1, characterized in that, In step S9, the tensile strength of the finished product is inspected to be 70 - 90 Mpa, and the elongation is ≥2%.

9. The method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets according to claim 1, characterized in that, Before the finished product packaging in step S9, inspect the indicators of the material thickness, width, end face quality, surface quality, water brushing, pinhole and flatness, and take samples to detect the mechanical properties of the cut material. During packaging, wrap it with EPE and plastic film in sequence, and put a desiccant before tying the plastic film. After wrapping the aluminum foil with the plastic film, put it into a wooden box, cover the wooden box with a wooden box cover, and tie the wooden box with a plastic steel belt to complete the packaging.