A method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets

Abstract

The present invention belongs to the technical field of aluminum processing, and specifically discloses a method for producing 1235 alloy cable aluminum foil by using continuous casting and rolling billets. The billets are rolled on a three-stand continuous rolling mill without undergoing cooling and milling, and then, after cold rolling, trimming and intermediate annealing, are rolled in multiple passes on an aluminum foil rolling mill to the thickness of the finished product. Finally, slitting, annealing and packaging are completed, thereby shortening the processing flow, reducing the metal production time and lowering energy consumption. After annealing, the finished aluminum foil produced by the continuous casting and rolling billets of the present invention can stably control the mechanical properties within a tensile strength range of 70 to 90 MPa. The performance of the finished product is more stable than that of materials produced by the casting and rolling method, and the grain structure of the finished product is finer and more uniform than that of materials produced by the casting and rolling method.

Description

Technical Field

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

[0002] In the field of aluminum processing, with the continuous development of casting, cold rolling, annealing and finishing technology at this stage, the use of cast-rolled billets to produce cable aluminum foil has become the mainstream. The cable aluminum foil produced by cast-rolled billets basically meets the strict requirements of cable aluminum foil in terms of mechanical properties, surface quality, dimensional accuracy, etc. Although the production of cable foil by cast-rolled billets has many advantages, it also has some disadvantages, mainly including the following aspects: the cooling rate is relatively fast during the casting and rolling process, which may cause segregation, pores, inclusions and other defects inside the cast-rolled billet. These defects will affect the mechanical properties and conductive properties of the cable foil and reduce product quality; there may be defects such as oxide scale, scratches, roller marks, etc. on the surface of the cast-rolled billet. Although surface treatment will be carried out in the subsequent processing, some minor defects may occur. Defects may still remain, affecting the appearance quality and surface smoothness of the cable foil, and placing certain restrictions on its application in the field of high-end cables; in the production process of cast-rolled billets, due to the rapid solidification rate of the metal melt, the distribution of alloy elements in the billet is not uniform, which may lead to differences in the performance of the cable foil in different parts. For some cable foils with extremely high requirements for composition uniformity, the cast-rolled billet may be difficult to fully meet the requirements; the processing performance of the cast-rolled billet is relatively limited. In the subsequent rolling process, due to the characteristics of its internal organization and stress state, a more complex rolling process and multiple intermediate annealing may be required to achieve the thickness and performance requirements of the cable foil, which prolongs the production cycle and increases production costs.

[0003] Conventional 1235 alloy cable aluminum foil products are produced using cast-rolled billets. For example, patent CN 103084805 B discloses a 1235 double-zero foil production process. The specific process flow is: smelting → cast-rolling → cold rolling → homogenization annealing → cold rolling → secondary annealing → cold rolling → trimming → foil rolling → slitting → finished product annealing → inspection and packaging. The existing process requires two intermediate annealings, which increases production costs and long production times. In addition, since the thickness of the cast-rolled billet is between 6.0 and 7.0 mm, this production method requires many subsequent rolling passes, consumes a lot of energy, and results in high production costs.

[0004] Prior art CN 113305149 A discloses a method for manufacturing double-zero aluminum foil billets suitable for AA8079 aluminum alloy by one-time intermediate annealing. The specific process is: smelting → casting and rolling → cold initial rolling → homogenization annealing → cold intermediate rolling → aluminum foil rough and intermediate rolling → double bonding → aluminum foil finishing rolling → slitting → finished product annealing. Our company has tried to use this method to produce 1235 alloy cable aluminum foil, but this method is not feasible. From the perspective of professional technology in this industry, the one-time annealing method has the following disadvantages: (1) the cast-rolled billet formed by the casting and rolling process is cooled to room temperature, and the cast-rolled billet cooled to room temperature is rolled on the cold rolling mill to a thickness of 0.5 to 1 .0mm, the cold-rolled blank is annealed at 460-540℃. This method produces single-sided smooth aluminum foil, and there is a great risk of dark side bright spots when the finished product is double-rolled. This defect will cause the material to be scrapped; (2) When producing single-sided smooth materials according to this process, the rolling force of the finished product double-rolled is large, and the production is prone to strip breakage and extremely unstable; (3) This method uses a one-time annealing scheme, which seems to be more convenient, but in fact, due to the reduction of one intermediate annealing, two rolling passes are required, and the production cost is higher; (4) The 1235 alloy aluminum foil produced by this method has large fluctuations in field frequency annealing performance, and the finished product performance is extremely unstable, and the elongation is low, which poses a quality risk. 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 using continuous casting and rolling billets. The billets are rolled on a three-stand continuous rolling mill without cooling and milling, and then subjected to cold rolling, trimming and intermediate annealing processes. The billets are then rolled in multiple passes on an aluminum foil rolling mill to the finished thickness, and finally slitting, annealing and packaging are completed, thereby shortening the processing flow, reducing metal production time and lowering energy consumption.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] A method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets comprises the following steps:

[0008] S1. Melting: Add raw materials to the tilting furnace, heat and stir to melt the melt in the tilting furnace, add metal additives to the tilting furnace after the charge is leveled, 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, argon and refining agent are introduced into the melt surface of the furnace through a refining machine at high speed for degassing and deslagging. After the refining is completed, the slag is removed. After the slag is removed, the melt is allowed to stand for more than 0.5h before starting the furnace;

[0009] S2. Casting: Starting the furnace, i.e. controlling the tilting furnace to lift the angle, the aluminum alloy melt enters the launder at a uniform speed. The aluminum alloy melt flows out at a uniform speed, passes through the online titanium wire feeding and online degassing box for degassing, and then enters the plate filter box for filtration. Then, it is injected into the casting cavity of the casting machine in equal amounts and at a uniform speed through the casting nozzle, and finally discharged from the casting cavity outlet into ingots with varying widths and thicknesses of 19 mm.

[0010] S3, triple rolling: the ingot obtained in step S2 is sent to the looper through the pinch rollers of the casting machine and then cooled by emulsion showering. It then enters the pinch rollers of the triple rolling mill and is rolled in three stands in sequence.

[0011] S4, cold rolling: the billet after the three-pass continuous rolling in step S3 is rolled in a cold rolling mill for multiple passes to obtain a 0.45 mm thick cold rolled coil;

[0012] S5. Longitudinal shearing: the material width tolerance after trimming is less than ±1mm, and there should be no aluminum powder accumulation on the edge;

[0013] S6, intermediate annealing: The coils trimmed in step S5 are placed in an annealing furnace. The annealing furnace temperature is raised to 530°C over 4 hours and held at this temperature for 10-20 hours. The furnace temperature is then adjusted to 480°C and held at this temperature for 5 hours. Finally, the coils are cooled and the temperature is lowered to 170°C and held at this temperature for 2 hours before being removed from the furnace.

[0014] S7, foil rolling: the coil after intermediate annealing in step S6 is rolled in multiple passes on an aluminum foil rolling mill to the finished thickness;

[0015] S8, finished product cutting: the cutting stagger is less than 0.5mm, and the finished product materials are directly placed in the frame suspended material rack and placed in the air;

[0016] S9. Annealing of finished products: After the material is cut, the cut material is loaded into the annealing frame according to the framing requirements and placed in the annealing furnace. After 4 hours, the annealing furnace is heated to 230℃ and kept warm for 20 hours. The negative pressure is maintained during the insulation. After the annealing process is completed, the material is taken out of the furnace and cooled naturally to room temperature. After inspection, it is packaged according to the packaging requirements.

[0017] Furthermore, in the method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets, the melt temperature during the furnace starting process in step S2 is: 745°C to 755°C, the hydrogen content in the melt is below 0.2ml / 100g·Al, and the hydrogen content in the aluminum alloy melt after online processing is below 0.12ml / 100g·Al.

[0018] Furthermore, in the method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets, in step S2, when the casting machine is in production, the front box temperature is 687°C to 693°C, the casting speed is 6.5 to 7.5 m / min, the casting machine pinch roller torque is 4.0 to 7.0 N*N, and the billet temperature at the casting cavity outlet is 520 to 580°C.

[0019] Furthermore, in the method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets, when the three stands in the machine are rolling in step S3, the outlet thickness 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 outlet thickness 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 outlet thickness 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.

[0020] Furthermore, in the method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets, in step S4 cold rolling, the roller crown is controlled at +0.04 mm crown and 0.65 μm roughness, the rolling oil temperature during the rolling process is 35-45° C., and the rolling thickness of each pass is as follows: (2-2.5) mm→1.2 mm→0.75 mm→0.45 mm.

[0021] Furthermore, in the method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets, in step S5, before longitudinal shearing, check whether there are foreign objects on the guide roller path and check whether the guide rollers rotate flexibly. Before threading the tape, each guide roller in the guide path must be cleaned with alcohol; during the production process, the surface quality of the material is strictly checked to ensure that there are no marks, aluminum sticking, abrasions and / or scratches on the surface of the aluminum coil, and no burrs, pyramids, ruffles and / or small waves on the edge are allowed on the end face.

[0022] Furthermore, 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, wherein the last rolling pass is double rolling.

[0023] Furthermore, in the method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets, step S9 is to inspect the finished product to ensure that the tensile strength is 70-90 MPa and the elongation is ≥2%.

[0024] Furthermore, in the method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets, before packaging the finished product in step S9, the material thickness, width, end face quality, surface quality, water brushing, pinhole condition and expandability indicators are inspected, and samples are taken to test the mechanical properties of the blanking material. During packaging, the aluminum foil is wrapped with pearl cotton and plastic film in sequence, and a desiccant is placed before the plastic film is tied. After the aluminum foil is wrapped with plastic film, it is placed in a wooden box, the wooden box lid is put on, and the wooden box is packed with plastic steel belts to complete the packaging.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. Conventional processes for producing cable foil raw materials require two annealings of cast and rolled materials. However, the continuous casting and rolling process of the present invention only requires one intermediate annealing at a thickness of 0.45 mm. This process can directly eliminate one intermediate annealing step, reduce annealing energy consumption by about 200 kwh / t, and shorten metal production time by more than 5 days.

[0027] 2. Conventional processes for producing cable foil raw materials require the use of cast and rolled materials, with a billet thickness of approximately 7.0 mm. However, the continuous casting billet thickness of the present invention is 19 mm, and the billet thickness after three continuous rolling is 2 to 2.5 mm. The overall number of cold rolling and foil rolling passes is reduced by two compared to conventional processes, reducing annealing energy consumption by approximately 300 kWh / t and saving rolling oil consumption by 10 kg / t.

[0028] 3. After annealing, the aluminum foil produced by continuous casting and rolling can stably control the mechanical properties of the finished product within a tensile strength range of 70-90 MPa and an elongation of ≥2%. The finished product performance is more stable than that of the material produced by the casting and rolling method, and the finished product grain structure is finer and more uniform than that of the material produced by the casting and rolling method.

[0029] 4. Compared with the CN113305149A method which requires eleven rolling passes, the present invention uses continuous casting and rolling billets to produce aluminum foil only requiring eight rolling passes, and the three-roll production cost of continuous casting and rolling billets is low. During subsequent processing and production, the deformation resistance is small and it is easier to process. In addition, the present invention uses a single annealing production without adding rolling passes. The grains of the billets produced by continuous casting and rolling are more uniform and fine. The quality of the finished product is much finer than that of the 1235 alloy aluminum foil product produced by the CN113305149A method, and the quality is better. DETAILED DESCRIPTION

[0030] In order to better understand the present invention, the content of the present invention is further clearly set forth below in conjunction with the examples, but the protection content of the present invention is not limited to the following examples. In the following description, a large number of specific details are provided in order 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.

[0031] The overall process of the method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets of the present invention is as follows: smelting - casting - three-stage continuous rolling - cold rolling - longitudinal shearing - intermediate annealing - foil rolling - finished product slitting - finished product annealing - inspection and packaging. The specific steps are as follows:

[0032] S1. Melting: Four 120t American Bricmont tilting furnaces are used for smelting. Raw materials are added to the tilting furnaces 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 is turned on to ensure that the melt in the furnace will not be overburned or segregated. After the charge is leveled, a sample casting mold is taken to test the alloy composition. According to the test results and the weight of the melt in the furnace, metal additives such as iron, quick-dissolving silicon, copper, manganese, and titanium 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%, Mg 0.01%, Cr 0.005%, Zn 0.01%, Ti 0.02%, the balance is Al. After the alloy composition ratio is qualified, high-purity argon and refining agent are introduced into the melt liquid surface in the furnace using the HD2000 refiner at high speed for degassing and deslagging treatment to meet the requirements of cleanliness and purity of the aluminum alloy melt. After refining, the scum is scraped off to ensure that the melt surface presents a mirror-like 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 before starting the furnace. It should be noted that the metal additives, argon and refining agent in this step are all commercially available conventional reagents.

[0033] S2. Casting: Starting the furnace, i.e. controlling the tilting furnace lifting angle so that the qualified aluminum alloy melt in the furnace enters the launder at a uniform and stable speed. During the starting process, the melt temperature is 745°C-755°C, 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 flowing out at a uniform speed is sequentially added through online titanium wire and degassed in an online degassing box before entering a plate filter box for filtration. 1.2-1.7g of titanium wire is added per ton of melt. High-purity argon is introduced into the degassing box. The rotor speed of the degassing box is 460r / min, the argon pressure is 0.8mpa, and two 50ppm ceramic filter plates are placed in the filter box. The hydrogen content in the aluminum alloy melt after online treatment is below 0.12ml / 100g·Al.

[0034] The melt that has been processed online is injected into the front box of the casting machine in equal amounts and at a uniform speed through the casting nozzle for casting. The billets with varying widths and thicknesses of 19 mm are then discharged through the casting cavity outlet. The casting cavity consists of two steel belts rotating in opposite directions and edge graphite blocks. The steel belts are closed on both sides by edge blocks sprayed with graphite insulation to form a rectangular enclosed space in the casting cavity. The two steel belts isolate the melt from the high-speed cooling water sprayed between the upper and lower frames, so that the heat of the melt can be quickly carried 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 the cooling water, the front box temperature, the casting machine speed and other parameters, the billet temperature at the casting cavity outlet is ensured to be: 495℃-555℃;

[0035] S3, three-stage rolling: After the billet comes out of the casting machine in step S2, it passes through the pinch rollers of the casting machine and enters the looper table, and then enters the pinch rollers of the rolling mill. The looper table can adjust the angle of the billet entering the rolling mill, so that the billet enters the three-stage rolling mill in the form of a parabola for continuous rolling. The two sets of pinch rollers cooperate to isolate the tension between the casting machine and the three-stage rolling mill, ensuring that the two equipments are completely unaffected. In the looper table area, in order to ensure that the cast plate cools down to avoid aluminum sticking when entering the three-stand rolling, the The emulsion is discharged to flush the ingot to cool it down. When the three stands are rolling in the machine, the outlet thickness of the first stand is 8.5mm, the rolling force is 520t, the rolling inlet temperature is 480℃, and the outlet temperature is 420℃; the outlet thickness of the second stand is 4.5mm, the rolling force is 320t, the rolling inlet temperature is 380℃, and the outlet temperature is 310℃; the outlet thickness of the third stand is 2.3mm, the rolling force is 190t, the rolling inlet temperature is 280℃, and the outlet temperature is 190℃.

[0036] S4. Cold rolling: The 2.3 mm billet produced by the above continuous casting and rolling is rolled in a cold rolling mill in multiple passes to obtain a 0.45 mm thick cold rolled coil. The roller crown is controlled at +0.04 mm and the roughness is 0.65 μm. 100# rolling oil is used, and the rolling oil additive content is controlled at about 7%. The rolling oil temperature during the rolling process is 35-45°C. The rolling thickness of each pass is as follows: 2.3 mm → 1.2 mm → 0.75 mm → 0.45 mm.

[0037] S5. Longitudinal shearing: Before longitudinal shearing, check whether there are foreign objects on the guide roller road and whether the guide rollers are flexible. Before threading, use alcohol to clean each guide roller in the guide road. During the production process, strictly check the surface quality of the material to ensure that there are no surface defects such as marks, aluminum sticking, abrasions and / or scratches on the surface of the aluminum coil, and there are no burrs, pyramids, ruffles and / or small waves on the edge of the end face. The width tolerance of the material after trimming is less than ±1mm, and there should be no aluminum powder accumulation on the edge.

[0038] S6. Intermediate annealing: During intermediate annealing, the material is placed on the annealing rack to ensure that the material is suspended during the entire process of material transfer, annealing, and cooling to avoid bruising or crushing of the material. In addition, before annealing, the material roll needs to be strapped with two steel strips in both the horizontal and vertical directions to ensure that there will be no loose layers during the entire process of material transfer, annealing, and cooling to prevent sticking problems. Four rolls of materials with the same specifications and weight are arranged as one batch of furnace annealing. The annealing process is as follows: after 4 hours, the annealing furnace temperature is raised to 530℃ and kept warm for 18 hours, then the furnace temperature is adjusted to 480℃ and kept warm for 5 hours, and finally the side cooling is turned on to reduce the furnace temperature to 170℃ and kept warm for 2 hours before being taken out of the furnace. Before each annealing, the annealing furnace equipment condition must be checked to ensure that the positive pressure air inlet duct is facing the center of the circulation fan, the thermocouple is not bent or damaged, the circulation fan protective mesh cover is not blocked by scattered aluminum foil, the positive and negative pressure fans on the furnace top are normal, and there is no sign of leakage in the circulating fan bearing cooling water pipe;

[0039] S7, foil rolling: Before rolling, use alcohol or rolling oil to wipe the outlet flattening roller to make the flattening roller show the original color of the glue. At the same time, rotate the flattening roller to check whether there is any glue explosion. When threading the strip, the outermost layer of the aluminum coil should be scrapped to prevent the rust of the steel strip from entering the roller gap and damaging the roller, causing aluminum sticking, marks, etc. The aluminum coil is rolled to the finished product thickness through multiple passes in the aluminum foil rolling mill. The specific rolling passes are 0.45 mm→0.22 mm→0.095 mm→0.042 mm→0.02 mm→0.009 mm, of which the last rolling pass is double-pass rolling. A stroboscope is required to check the surface quality of each rolling pass. After each pass, the surface quality of the roll cycle is checked for periodic defects. If any abnormality is found, the rolls are replaced immediately. The thickness gauge must be calibrated before rolling the finished product to ensure that the thickness of the rolled product is normal. At the same time, the blowing angle and air volume of the blowing nozzle are adjusted to ensure that there are no oil spots on the rolled material. The rolling parameters are implemented in accordance with relevant process standards to ensure the quality of the rolled product.

[0040] S8. Finished product slitting: When slitting finished products, all guide rollers in the guide path must be cleaned with alcohol. Ensure that there are no marks, aluminum sticking, abrasions, or scratches on the surface of the finished material. The end face is not allowed to have burrs, pyramids, ruffles, or small waves on the edges. The slitting staggered layer must be less than 0.5mm, and the end face of the slitting small rolls must not be hit or scratched. Mark the batch number and specifications on the surface of the slitting small rolls with a marker. The finished materials are directly placed in the frame suspension rack and are not allowed to fall directly on the ground.

[0041] S9, finished product annealing: After the material is cut, the cut material is loaded into the annealing frame according to the framing requirements. Before the finished product is hoisted for annealing, check whether the surface seal of the incoming material is firmly adhered, check whether the surface and end face are damaged, check the annealing furnace condition before entering the furnace, check whether there is aluminum foil on the circulating fan cover on the top of the furnace, check whether the cooling water ring of the furnace door is leaking, and check whether there is dew on the top of the annealing furnace. Only when all the above checks are normal can the furnace be annealed. The finished product annealing process is as follows: after 4 hours, the annealing furnace is heated to 230℃ and kept warm for 20 hours. The negative pressure is maintained during the insulation. The material can be taken out of the furnace only after the annealing process is completed, and the material is allowed to cool naturally to room temperature.

[0042] Inspection and packaging: Before packaging the finished product, check whether the material thickness, width, end surface quality, surface quality, water brushing, pinhole condition and expansion index meet the quality standards, and take samples to test the mechanical properties of the blank. A single sheet of 0.009mm thick single-layer aluminum foil coil has a tensile strength of 78Mpa, an elongation of 2.9%, and a surface wettability of Class A. The tensile strength of the finished product in the existing technology CN113305149A is 90-110MPa, and the elongation is ≥2 .0%. Due to the needs of cable usage scenarios, cables need to be completely wrapped in various limited spaces. Soft aluminum foil is easier to bend and wrap. During the cable production process, it can be more conveniently wrapped around the cable core wire and adapt to cable structures of different shapes and sizes. When laying the cable, it can also be better arranged along the line direction, reducing installation difficulties and damage to other parts of the cable caused by the aluminum foil being too hard. In addition, soft aluminum foil can better fit the cable core wire and other shielding layers, reducing gaps and air layers, thereby improving the shielding effect against electromagnetic interference and ensuring the stability and quality of cable transmission signals. Therefore, the aluminum foil performance is required to be relatively soft, that is, the tensile strength should be low. Therefore, our company's solution for producing aluminum foil is more suitable for cable production. After passing the inspection, it is wrapped with pearl cotton and plastic film in turn, and desiccant is added before the plastic film is tied. After the aluminum foil is wrapped with plastic film, it is placed in a wooden box, the wooden box lid is put on, and the wooden box is packed with plastic steel straps to complete the packaging.

[0043] The invention uses a Hazeltt casting machine to produce a 19mm thick billet of 1235 alloy. The billet is rolled to a thickness of 2.3mm by a three-stand continuous rolling mill without undergoing cooling and milling. The billet is then sequentially subjected to cold rolling, trimming, and intermediate annealing processes, followed by multiple rolling processes using aluminum foil to achieve the finished product thickness. Finally, the finished product is slit, annealed, and packaged, thereby shortening the production cycle and reducing the production cost.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not limiting. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets, characterized in that: The steps include: S1. Melting: Add raw materials to the tilting furnace, heat and stir to melt the melt in the tilting furnace, add metal additives to the tilting furnace after the charge is leveled, 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, argon and refining agent are introduced into the melt surface of the furnace through a refining machine at high speed for degassing and deslagging. After the refining is completed, the slag is removed. After the slag is removed, the melt is allowed to stand for more than 0.5h before starting the furnace; S2. Casting: Starting the furnace, i.e. controlling the tilting furnace to lift the angle, the aluminum alloy melt enters the launder at a uniform speed. The aluminum alloy melt flows out at a uniform speed, passes through the online titanium wire feeding and online degassing box for degassing, and then enters the plate filter box for filtration. Then, it is injected into the casting cavity of the casting machine in equal amounts and at a uniform speed through the casting nozzle, and finally discharged from the casting cavity outlet into ingots with varying widths and thicknesses of 19 mm. S3, triple rolling: the ingot obtained in step S2 enters the looper table through the pinch rollers of the casting machine and is cooled by emulsion showering, and then enters the pinch rollers of the triple rolling mill and is rolled in three stands in sequence. When the three stands in the machine are rolled, the outlet thickness 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 outlet thickness 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 outlet thickness 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. S4, cold rolling: the billet after the three-pass rolling in step S3 is rolled in a cold rolling mill for multiple passes, the roll crown is controlled at +0.04 mm crown and 0.65 μm roughness, the rolling oil temperature is 35-45°C during the rolling process, and the rolling thickness of each pass is as follows: (2-2.5) mm → 1.2 mm → 0.75 mm → 0.45 mm; S5. Longitudinal shearing: the material width tolerance after trimming is less than ±1mm, and there should be no aluminum powder accumulation on the edge; S6, intermediate annealing: The coils trimmed in step S5 are placed in an annealing furnace. The annealing furnace temperature is raised to 530°C over 4 hours and held at this temperature for 10-20 hours. The furnace temperature is then adjusted to 480°C and held at this temperature for 5 hours. Finally, the coils are cooled and the temperature is lowered to 170°C and held at this temperature for 2 hours before being removed from the furnace. S7, foil rolling: the coil after intermediate annealing in step S6 is rolled in multiple passes on an aluminum foil rolling mill to the finished thickness; S8, finished product cutting: the cutting stagger is less than 0.5mm, and the finished product materials are directly placed in the frame suspended material rack and placed in the air; S9. Annealing of finished products: After the material is cut, the cut material is loaded into the annealing frame according to the framing requirements and placed in the annealing furnace. After 4 hours, the annealing furnace is heated to 230℃ and kept warm for 20 hours. The negative pressure is maintained during the insulation. After the annealing process is completed, the material is taken out of the furnace and cooled naturally to room temperature. After inspection, it is packaged 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: The melt temperature during the furnace starting process in step S2 is: 745°C ~ 755°C, the hydrogen content in the melt is below 0.2ml / 100g·Al, and the hydrogen content in the aluminum alloy melt after online treatment is below 0.12ml / 100g·Al.

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

4. The method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets according to claim 1, wherein: Step S5: Before longitudinal shearing, check whether there are foreign objects on the guide roller road and whether the guide rollers can rotate flexibly. Before threading the belt, use alcohol to clean each guide roller in the guide road. During the production process, strictly check the surface quality of the material to ensure that there are no marks, aluminum sticking, abrasions and / or scratches on the surface of the aluminum coil, and no burrs, pyramids, ruffles and / or small waves on the edge are allowed on the end face.

5. The method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets according to claim 1, wherein: 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, wherein the last rolling pass is double-pass rolling.

6. The method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets according to claim 1, wherein: Step S9 checks the tensile strength of the finished product to be 70-90 MPa and the elongation ≥ 2%.

7. The method for producing 1235 alloy cable aluminum foil using continuous casting and rolling billets according to claim 1, wherein: Before packaging the finished product in step S9, the material thickness, width, end face quality, surface quality, water brushing, pinhole condition and expandability indicators are inspected, and samples are taken to test the mechanical properties of the blanking material. When packaging, it is wrapped with pearl cotton and plastic film in turn, and a desiccant is placed before the plastic film is tied. After the aluminum foil is wrapped with plastic film, it is placed in a wooden box, the wooden box lid is put on, and the wooden box is packed with plastic steel belts to complete the packaging.