Cast-rolling machine, production line and production method for copper-aluminum composite plate

Abstract

The invention relates to the technical field of copper-aluminum composite board production, and provides a copper-aluminum composite board casting and rolling machine, a production line and a production method.The copper-aluminum composite board casting and rolling machine comprises a rack, two rollers located in the rack and a driving mechanism for driving the two rollers to synchronously rotate in different directions; the relative angle of the two rollers can be adjusted by directly controlling starting and stopping of the jacking oil cylinders, gas can be discharged more easily due to inclination of the rollers, bubbles can be brought to the upper portion or the edge area of a molten pool in the flowing direction of melt in the melt flowing process, and therefore the bubbles can be discharged more easily, the precision of finished products is improved, and the production cost is reduced. The inclined arrangement also enables the melt to form a more uniform flowing state when the melt flows into the gaps of the rollers, and the flowing state is beneficial to reducing turbulent flow and vortex in the melt, so that generation and entrainment of bubbles are reduced, and the quality of finished products is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of copper-aluminum composite plate production, and specifically, to a copper-aluminum composite plate casting and rolling mill, a production line and a production method thereof. Background Art

[0002] At present, copper-aluminum composite materials combine the advantages of light weight, low cost of aluminum and high electrical and thermal conductivity of copper, and have extremely high cost-effective synergy. Such materials have been widely used in fields such as aerospace, power electronics, communication, and photovoltaic new energy. With the progress of technology and the development of industry, the demand for high-performance, lightweight, and economical materials is increasing day by day, and the market demand for copper-aluminum composite materials is continuously expanding.

[0003] The solid-liquid casting and rolling composite technology is a new process that combines continuous casting and semi-solid state. It utilizes the high temperature of casting composite and the pressure of rolling composite to achieve high-strength metallurgical bonding of dissimilar metals. This technology has the characteristics of high efficiency and energy saving, and excellent product performance, and is particularly suitable for the preparation of copper-aluminum composite plates. Compared with the traditional solid-solid composite method, the solid-liquid casting and rolling composite technology has advantages such as simple process, small influence by the shape and size of the parts to be composite, and low requirements for equipment.

[0004] However, the existing copper-aluminum composite plate production lines have the following problems: 1. The rollers of the copper-aluminum composite plate casting and rolling mill in the prior art are generally arranged vertically. Under the vertical arrangement, after the aluminum liquid is injected from the casting nozzle, due to the action of gravity, an uneven flow distribution is formed between the rollers, which may cause the aluminum liquid to accumulate in some areas between the rollers and be insufficiently distributed in other areas, resulting in low uniformity and consistency of the produced copper-aluminum composite strip. In addition, under the vertical arrangement, the bubbles and inclusions in the aluminum liquid may be deposited at the bottom or edge areas of the cast and rolled strip due to the action of gravity and are difficult to effectively discharge, which may cause defects such as pores and inclusions in the cast and rolled strip, affecting the product quality.

[0005] 2. The outlet shape of the casting nozzle in the prior art is usually relatively straight and cannot closely fit the shape of the copper strip, and can only be applicable to casting and rolling thinner copper strips. When the aluminum liquid passes through the casting nozzle, due to the uneven flow or pressure fluctuation, the aluminum liquid may overflow or flow back from the gap between the casting nozzle and the copper strip. In addition, the overflow of the aluminum liquid not only causes waste of raw materials, but also pollutes the casting equipment and the surrounding environment. At the same time, the overflowed aluminum liquid may form irregular protrusions or burrs after cooling, affecting the surface quality of the casting and subsequent processing. Summary of the Invention

[0006] The present invention provides a casting and rolling mill for copper-aluminum composite plates, which solves the problems in the prior art that the roller angle cannot be adjusted and the aluminum liquid is prone to flow back when the roller rolls the copper-aluminum composite plate.

[0007] To achieve the above object, the technical solution of the present invention is as follows: A copper-aluminum composite plate casting and rolling mill, comprising a frame; Two rolling rolls, the two rolling rolls are located inside the frame; A driving mechanism, the driving mechanism drives two adjacent rolling rolls to rotate synchronously and in opposite directions; A casting nozzle located on one side of the two rolling rolls, an inlet, an outlet and a connecting groove are provided inside the casting nozzle, the connecting groove is used to connect the outlet and the inlet, and the outlet of the casting nozzle points between the two rolling rolls; The axial center lines of the two rolling rolls are parallel, and the inclination angle between the plane where the axial center lines of the two rolling rolls are located and the vertical line of the horizontal plane is α, and the angle of α is between 0° and 20°; The two sides of the casting nozzle close to the two rolling rolls are inclined, for placing the casting nozzle between the two rolling rolls, a groove is provided on the casting nozzle, the groove is communicated with the outlet, and the groove is used to pass through the copper strip to make the aluminum liquid contact the copper strip in advance, while preventing the backflow of the aluminum liquid and increasing the contact time between the aluminum liquid and the copper strip.

[0008] Preferably, a water cooling component is provided inside each of the two rolling rolls; The bottom of the frame is fixedly connected with a movable plate, one end of the movable plate is movably hinged with a fixed plate, the bottom of the fixed plate is fixedly connected with a plurality of support bars, and the plurality of support bars are arranged in parallel; A plurality of jacking cylinders are installed on the top of the fixed plate, the output end of the jacking cylinder is fixedly connected with a movable connecting part, the bottom of the movable plate is fixedly connected with a plurality of limiting blocks, a fixed connecting part is fixedly connected inside the plurality of limiting blocks, the plurality of movable connecting parts and the plurality of fixed connecting parts correspond one by one, and the movable connecting part and the fixed connecting part are hinged. By the jacking cylinders arranged on the top of the fixed plate, the entire frame can be jacked up, so as to adjust the angle between the two roll shafts and the vertical line of the horizontal plane, so as to meet the production of copper-aluminum composite plates with different thicknesses.

[0009] Preferably, a shaft bracket is fixedly connected to one side of the frame. A feeding roller is rotatably installed inside the two shaft brackets. The processed copper-aluminum composite plate is sent out through the feeding roller. Two mounting brackets are fixedly connected to one side of the frame. The two mounting brackets correspond to the two rolling rollers one by one. Slide rails are installed on the two mounting brackets. A sliding block is fixedly connected to the moving part of the slide rail. A heating nozzle is installed on one side of the sliding block. The input end of the heating nozzle is connected to an air inlet pipe. One end of the air inlet pipe is connected to a gas storage tank. Liquefied gas is stored inside the gas storage tank. During the operation of the casting-rolling mill, two heating nozzles are started simultaneously, and the slide rail is started, so that the heating nozzle reciprocates along the direction of the roller shaft to preheat the surface of the rolling roller. In addition, since the fuel used by the heating nozzle is liquefied gas, the black smoke generated during the incomplete combustion of the liquefied gas can lubricate the rolling roller, reduce the demand for traditional lubricants, and thus reduce environmental pollution.

[0010] Preferably, a fixed slide rail is installed on one side of the frame. A mounting seat is fixedly connected to the top of the moving end of the fixed slide rail. The casting nozzle is installed on the top of the mounting seat; The casting nozzle includes a detachable casting nozzle bottom plate, a casting nozzle middle plate, and a casting nozzle top plate. The groove is opened on the casting nozzle top plate. The communication groove is opened inside the casting nozzle middle plate. A number of guide blocks evenly distributed in a rectangular array are arranged inside the communication groove. The guide blocks are triangular. Setting the guide blocks in a triangular shape can ensure that the aluminum liquid is evenly distributed when spraying out of the casting nozzle and ensure the quality of the cast copper-aluminum composite plate.

[0011] Preferably, the casting nozzle bottom plate, the casting nozzle middle plate, the guide blocks, and the casting nozzle top plate are all made of high-temperature resistant ceramic fiber; The width of the groove is D, and the length of D is between 0-8 mm. The length of the groove is H, and the length of H matches the width of the copper strip. Setting the length of the groove to match the width of the copper strip can well ensure that the copper strip is closely attached to the groove and prevent the backflow of the aluminum liquid.

[0012] Preferably, the production line further includes a melting furnace, a degassing box, a filtering device, a feeding device, a shearing machine, a winding machine, and a holding furnace; The melting furnace is used for melting and purifying aluminum ingots; The holding furnace is connected to the output port of the melting furnace and is used for precipitating impurities inside the aluminum liquid and keeping the aluminum liquid warm; The degassing box is connected to the output port of the holding furnace and is used for degassing the aluminum liquid; The filtering device is connected to the output port of the degassing box and is used for removing impurities from the aluminum liquid; The feeding device is used for continuous feeding of the copper strip; The casting-rolling mill is located downstream of the filtering device and is used to perform solid-liquid casting-rolling on molten aluminum liquid and copper strip to process a copper-aluminum composite plate; The shearing machine and the coiling machine are respectively used for the fixed-length cutting and coiling of the composite plate and the coiling of the finished copper-aluminum alloy plate.

[0013] Preferably, a production method of a copper-aluminum composite plate includes the following steps: Step S1: Heat the aluminum ingot in a melting furnace until it melts, add a grain refiner and keep it standing for heat preservation to make aluminum liquid; Step S2: Pass the aluminum liquid obtained in Step S1 into the inside of a degassing box and a filtering device in sequence to remove the gas and impurities in the aluminum liquid, and obtain the filtered aluminum liquid; Step S3: Adjust the relative angle of the two rollers by starting the lifting oil cylinder; Step S4: Unroll the copper strip through a feeding device, pass the copper strip through two support rods through a guiding roller, and finally pass through the groove on the casting nozzle top plate and then pass between the two rollers; Step S5: Preheat the casting nozzle at a temperature of 200~400°C, and pass the filtered aluminum liquid into the preheated casting nozzle; Step S6: Start the two rollers to perform casting-rolling on the aluminum liquid and copper plate in the middle, and the water-cooling components inside the rollers will take away the heat of the aluminum liquid to make it solidify and crystallize; Step S7: After the composite plate is trimmed by the shearing machine, it is coiled by the coiling machine, and the coiling tension is controlled to be 5~15kN.

[0014] Preferably, in Step S2, the aluminum content of the aluminum liquid is greater than 99.6%, and the temperature of the melting furnace is 740°-760°; In Step S4, the minimum distance between the two rollers is between 4-25mm, and the thickness of the copper strip in Step S4 is between 2~7mm.

[0015] The working principle and beneficial effects of the present invention are as follows: 1. In the present invention, by arranging the two rollers obliquely, the inclination of the rollers can make the gas easier to discharge. During the flow of the melt, the bubbles may be carried to the upper or edge area of the molten pool along with the flow direction of the melt, so that they are more easily discharged, thereby improving the accuracy of the finished product. Also, the inclined arrangement enables the melt to form a more uniform flow state when flowing into the roller gap. This flow state helps to reduce the turbulence and eddy current in the melt, thereby reducing the generation and entrainment of bubbles and improving the quality of the finished product.

[0016] 2. The present invention is provided with structures such as grooves matching the copper strip at the casting nozzle. When the molten aluminum flows out of the casting nozzle, it will first contact the copper strip, and the copper strip will block and prevent the backflow of the molten aluminum. The overflow of the molten aluminum will not only cause waste of raw materials, but also may pollute the casting equipment and the environment.

[0017] 3. The present invention obtains a copper-aluminum alloy plate with relatively optimal density, tensile strength, shear strength, adhesion strength, and peel strength by tilting the rolling rolls, ensuring the quality of production.

[0018] 4. The present invention is provided with a jacking oil cylinder that can control the tilting angle of the rolling rolls. When installing or overhauling the roll shafts, only by using the jacking oil cylinder to restore the two roll shafts to the vertical state, it is convenient for installation and overhaul, eliminating the problem of difficult overhaul in the inclined state. In addition, setting the two roll shafts to be in an adjustable tilting angle state is also convenient for repeatedly adjusting the angle during the later use process, preventing the angle from deviating due to long-term operation and improving flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0020] Figure 1 is a schematic diagram of the overall structure of the casting and rolling mill of the present invention; Figure 2 is a schematic diagram of the overall structure of the casting and rolling mill of the present invention from another perspective; Figure 3 is a side cross-sectional view of the present invention; Figure 4 is a schematic diagram of the overall structure of the left corner of the casting and rolling mill of the present invention; Figure 5 is a schematic diagram of the structure of the casting nozzle of the present invention; Figure 6 is a partial structure schematic diagram of the casting nozzle of the present invention; Figure 7 is a front view of the casting nozzle of the present invention; Figure 8 is a schematic diagram of the production line of the copper-aluminum composite plate of the present invention.

[0021] In the figure: 1. Melting furnace; 2. Degassing box; 3. Filter device; 4. Feeding device; 5. Casting and rolling mill; 51. Frame; 52. Support rod; 53. Roll; 54. Groove; 55. Fixed slide rail; 56. Mounting seat; 57. Casting nozzle bottom plate; 58. Casting nozzle middle plate; 59. Casting nozzle top plate; 510. Flow guiding block; 511. Mounting frame; 512. Sliding block; 513. Sliding track; 514. Inlet pipe; 515. Shaft frame; 516. Feeding roller; 517. Movable plate; 518. Fixed plate; 519. Support bar; 520. Jacking oil cylinder; 521. Heating nozzle; 522. Limit block; 523. Movable connection part; 524. Fixed connection part; 6. Shearing machine; 7. Rewinding machine. Specific implementation manner

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of the present invention. Embodiment 1

[0023] As Figures 1 - 8 shown, this embodiment proposes a copper-aluminum composite plate casting-rolling machine 5 and a solid-liquid casting-rolling composite production line for copper-aluminum composite plates including the same (see Figure 8 ), including a frame 51; Two rolling rolls 53, and the two rolling rolls 53 are located inside the frame 51; A driving mechanism, and the driving mechanism drives two adjacent rolling rolls 53 to rotate synchronously and in opposite directions; The casting nozzle is located on one side of the two rolling rolls 53. An inlet liquid port, an outlet liquid port and a communication groove are opened inside the casting nozzle. The communication groove is used to connect the outlet liquid port and the inlet liquid port, and the outlet liquid port of the casting nozzle points between the two rolling rolls 53; The axial centerlines of the two rolling rolls 53 are parallel, and the inclination angle between the plane where the axial centerlines of the two rolling rolls 53 are located and the vertical line of the horizontal plane is α, and the angle of α is 15°; The two sides of the casting nozzle close to the two rolling rolls 53 are inclined, for placing the casting nozzle between the two rolling rolls 53. A groove 54 is opened on the casting nozzle, and the groove 54 is communicated with the outlet liquid port. The groove 54 is used to pass through the copper strip to make the aluminum liquid contact the copper strip in advance, while preventing the aluminum liquid from flowing back and increasing the contact time between the aluminum liquid and the copper strip.

[0024] Water cooling components are arranged inside both of the two rolling rolls 53; The bottom of the frame 51 is fixedly connected with a movable plate 517. One end of the movable plate 517 is movably hinged to a fixed plate 518. The bottom of the fixed plate 518 is fixedly connected with a plurality of support bars 519, and the plurality of support bars 519 are arranged in parallel; A number of lifting cylinders 520 are installed on the top of the fixed plate 518. The output end of the lifting cylinder 520 is fixedly connected with a movable connecting part 523. A number of limiting blocks 522 are fixedly connected to the bottom of the movable plate 517. A fixed connecting part 524 is fixedly connected inside the number of limiting blocks 522. The number of movable connecting parts 523 and the number of fixed connecting parts 524 correspond one by one, and the movable connecting part 523 and the fixed connecting part 524 are hinged.

[0025] One side of the frame 51 is fixedly connected with a shaft frame 515. A feeding roller 516 is rotatably installed inside the two shaft frames 515. The processed copper-aluminum composite plate is sent out through the feeding roller 516. One side of the frame 51 is fixedly connected with two mounting frames 511. The two mounting frames 511 correspond to the two rolling rollers 53 respectively. Slide rails 513 are installed on both of the two mounting frames 511. A slider 512 is fixedly connected to the moving part of the slide rail 513. A heating nozzle 521 is installed on one side of the slider 512. The input end of the heating nozzle 521 is connected with an air inlet pipe 514. One end of the air inlet pipe 514 is connected with a gas storage tank, and liquefied gas is stored inside the gas storage tank.

[0026] One side of the frame 51 is provided with a fixed slide rail 55. The top of the movable end of the fixed slide rail 55 is fixedly connected with a mounting seat 56. The casting nozzle is installed on the top of the mounting seat 56; The casting nozzle includes a detachable casting nozzle bottom plate 57, a casting nozzle middle plate 58 and a casting nozzle top plate 59. A groove 54 is opened on the casting nozzle top plate 59. A connecting groove is opened inside the casting nozzle middle plate 58. A number of flow guiding blocks 510 evenly distributed in a rectangular array are arranged inside the connecting groove. The flow guiding block 510 is triangular.

[0027] The casting nozzle bottom plate 57, the casting nozzle middle plate 58, the flow guiding block 510 and the casting nozzle top plate 59 are all made of high-temperature resistant ceramic fiber; The width of the groove 54 is D, and the length of D is between 0 - 8 mm. The length of the groove 54 is H, and the length of H matches the width of the copper strip.

[0028] As Figures 1 - 8 shown, a solid-liquid casting and rolling composite production line for copper-aluminum composite plates. The production line further includes a melting furnace 1, a degassing box 2, a filtering device 3, a feeding device 4, a shearing machine 6, a winding machine 7 and a holding furnace; The melting furnace 1 is used for melting and purifying aluminum ingots; The holding furnace is connected to the output port of the melting furnace 1 and is used for precipitating impurities inside the aluminum liquid and keeping the aluminum liquid warm; The degassing box 2 is connected to the output port of the holding furnace and is used for degassing the aluminum liquid; The filtering device 3 is connected to the output port of the degassing box 2 and is used for removing impurities from the aluminum liquid; A feeding device 4 for continuously feeding the copper strip; The casting-rolling mill 5 is located downstream of the filtering device 3 and is used for solid-liquid casting-rolling of molten aluminum liquid and the copper strip to process into a copper-aluminum composite plate; The shearing machine 6 and the coiling machine 7 are respectively used for fixed-length cutting and coiling of the composite plate and coiling of the finished copper-aluminum alloy plate.

[0029] Working principle: When using the casting-rolling mill 5 for casting-rolling operations, first start two lifting cylinders 520 simultaneously. Under the action of the lifting cylinders 520, the movable plate 517, the frame 51 fixed on its top, and the two rolling rolls 53 inside the frame 51 will all be lifted, so as to keep the rolling rolls 53 at the required angle. After completing the angle adjustment, lock the lifting cylinders 520 to maintain the angle; By adjusting the size and quantity of the grooves 54 on the casting nozzle top plate 59, the length, width, and quantity of the grooves 54 can be made to correspond one by one according to the width, thickness, and quantity of the copper strip to be compounded as required, flexibly meeting the requirements for producing different products. After selecting a suitable casting nozzle, fix it on the mounting seat 56. After completing the fixation, send the casting nozzle into the middle of the two rolling rolls 53 through the fixed slide rail 55, so that the inclined surface of the casting nozzle bottom plate 57 is tangent to the outer surface of the lower rolling roll 53, and the inclined surface of the casting nozzle top plate 59 is tangent to the outer surface of the upper rolling roll 53. At this time, the installation of the casting nozzle is completed; Unroll the copper strip to be compounded through the feeding device 4, change the direction of one end of the copper strip through the roller shaft, make it pass through between the two support rods 52, and finally pass through the grooves 54 on the casting nozzle and then through between the two rolling rolls 53. At this time, the installation of the copper strip is completed; Put the aluminum ingot into the melting furnace 1 to melt. The molten aluminum liquid passes through the degassing box 2 and the filtering device 3 to remove the internal impurities and gases, and finally enters the casting nozzle. At the same time, start the two rolling rolls 53. After the aluminum liquid leaves the casting nozzle, it will first contact the copper strip. The copper strip will prevent the aluminum liquid from flowing back. The aluminum liquid will crystallize when contacting the rolling roll, and the heat will be taken away by the water-cooling device inside the rolling roll. During the casting-rolling process, the bubbles will try to move upward due to the buoyancy effect. The inclination of the rolling rolls 53 can provide more favorable channels and conditions for the discharge of the bubbles, thus ensuring the dimensional accuracy and the uniformity of the internal structure; In addition, during the casting-rolling process, the heating nozzle 521 can be started. The heating nozzle 521 will ignite the liquefied gas input through the air inlet pipe 514, and the soot generated when the liquefied gas burns can adhere to the surface of the rolling roll 53 to form a thin lubricating layer. This lubricating layer helps to reduce the friction between the metal blank and the rolling roll 53 during the rolling process, thereby reducing energy consumption, extending the service life of the rolling roll 53, and improving the surface quality of the rolled product; Finally, the cast-rolled copper-aluminum alloy plate will continue to be conveyed by the roller to the shearing machine 6, where the edges are sheared as needed, and finally wound by the coiler 7. The entire shearing and winding process is prior art and will not be elaborated here. Embodiment 2

[0030] This embodiment is a production method of copper-aluminum composite plate.

[0031] Adopt the solid-liquid casting and rolling composite production line of copper-aluminum composite plate given in Embodiment 1, and follow the following steps: Step S1: Heat the aluminum ingot to melting in the melting furnace 1. The temperature of the melting furnace 1 is 750°, add a grain refiner and keep it static for heat preservation to make aluminum liquid; Step S2: Pass the aluminum liquid obtained in Step S1 into the inside of the degassing box 2 and the filtering device 3 in sequence to remove the gas and impurities in the aluminum liquid, and obtain the filtered aluminum liquid; Step S3: Adjust the relative angle of the two rollers 53 by starting the lifting oil cylinder 520. The roller angle is 0°, the rollers are kept vertical, the closest distance between the rollers is 7 mm, and the thickness of the copper strip is 2 mm; Step S4: The copper plate strip is unwound by the feeding device 4, passes through the guiding roller, passes the copper strip through the two support rods 52, and finally passes through the groove 54 on the casting nozzle top plate 59 and then through between the two rollers 53; Step S5: Preheat the casting nozzle at a temperature of 200 °C, and pass the filtered aluminum liquid into the preheated casting nozzle; Step S6: Start the two rollers 53 to cast and roll the aluminum liquid and copper plate in the middle. The water-cooling component inside the roller 53 will take away the heat of the aluminum liquid and solidify it; Step S7: The composite plate is trimmed by the shearing machine 6 and then coiled by the coiler 7. The coiling tension is controlled at 15 kN, and the copper-aluminum composite plate strip is obtained. Embodiment 3

[0032] This embodiment is also a production method of copper-aluminum composite plate. It adopts the solid-liquid casting and rolling composite production line of copper-aluminum composite plate disclosed in Embodiment 1, and follows the following steps: Step S1: Heat the aluminum ingot to melting in the melting furnace 1. The temperature of the melting furnace 1 is 750°, add a grain refiner and keep it static for heat preservation to make aluminum liquid; Step S2: Pass the aluminum liquid obtained in Step S1 into the inside of the degassing box 2 and the filtering device 3 in sequence to remove the gas and impurities in the aluminum liquid, and obtain the filtered aluminum liquid; Step S3: Adjust the relative angle of the two rollers 53 by starting the lifting oil cylinder 520. The roller angle is 10°, the closest distance between the rollers is 7 mm, and the thickness of the copper strip is 2 mm; Step S4: The copper strip is unwound by the feeding device 4, passes through the guiding roller, and the copper strip passes through the two support rods 52, and after passing through the groove 54 on the nozzle top plate 59, finally passes between the two rollers 53; Step S5: Preheat the nozzle at a temperature of 300 °C, and introduce the filtered aluminum liquid into the preheated nozzle; Step S6: Start the two rollers 53 to cast-roll the aluminum liquid and the copper plate in the middle, and the water-cooling component inside the roller 53 will take away the heat of the aluminum liquid to solidify it; Step S7: The composite plate is trimmed by the shearing machine 6 and then wound by the coiler 7, and the winding tension is controlled to be 10 kN, and the copper-aluminum composite strip is obtained. Example 4

[0033] This example is also a production method of a copper-aluminum composite plate, which uses the solid-liquid casting-rolling composite production line of the copper-aluminum composite plate disclosed in Example 1, and includes the following steps: Step S1: Heat the aluminum ingot to melting in the melting furnace 1, the temperature of the melting furnace 1 is 750 °, add a grain refiner and keep it statically insulated to make aluminum liquid; Step S2: Introduce the aluminum liquid obtained in Step S1 into the inside of the degassing box 2 and the filtering device 3 in sequence to remove the gas and impurities in the aluminum liquid, and obtain the filtered aluminum liquid; Step S3: Adjust the relative angle of the two rollers 53 by starting the jacking oil cylinder 520, the roller angle is 15 °, the closest distance between the rollers is 7 mm, and the thickness of the copper strip is 2 mm; Step S4: The copper strip is unwound by the feeding device 4, passes through the guiding roller, and the copper strip passes through the two support rods 52, and after passing through the groove 54 on the nozzle top plate 59, finally passes between the two rollers 53; Step S5: Preheat the nozzle at a temperature of 300 °C, and introduce the filtered aluminum liquid into the preheated nozzle; Step S6: Start the two rollers 53 to cast-roll the aluminum liquid and the copper plate in the middle, and the water-cooling component inside the roller 53 will take away the heat of the aluminum liquid to solidify it; Step S7: The composite plate is trimmed by the shearing machine 6 and then wound by the coiler 7, and the winding tension is controlled to be 8 kN, and the copper-aluminum composite strip is obtained. Example 5

[0034] This example is also a production method of a copper-aluminum composite plate, which uses the solid-liquid casting-rolling composite production line of the copper-aluminum composite plate disclosed in Example 1, and includes the following steps: Step S1: Heat the aluminum ingot to melting in the melting furnace 1, the temperature of the melting furnace 1 is 750 °, add a grain refiner and keep it statically insulated to make aluminum liquid; Step S2: Feed the aluminum liquid obtained in Step S1 successively into the inside of the degassing box 2 and the filtering device 3 to remove the gas and impurities in the aluminum liquid, and obtain the filtered aluminum liquid; Step S3: Adjust the relative angle of the two rollers 53 by starting the lifting oil cylinder 520. The roller angle is 20°, the closest distance between the rollers is 7 mm, and the thickness of the copper strip is 2 mm; Step S4: The copper plate strip is unfolded by the feeding device 4, passes through the guiding roller, the copper strip passes through the two support rods 52, and after passing through the groove 54 on the nozzle top plate 59, finally passes between the two rollers 53; Step S5: Preheat the nozzle at a temperature of 400 °C, and feed the filtered aluminum liquid into the preheated nozzle; Step S6: Start the two rollers 53 to carry out casting and rolling on the aluminum liquid and copper plate in the middle. The water-cooling components inside the rollers 53 will take away the heat of the aluminum liquid to solidify it; Step S7: The composite plate is trimmed by the shearing machine 6 and then coiled by the coiling machine 7. The coiling tension is controlled at 15 kN, and the copper-aluminum composite plate strip is obtained.

[0035] Comparative Example 1 A production method of a copper-aluminum composite plate adopts a solid-liquid casting and rolling composite production line for a copper-aluminum composite plate as in Example 1, and includes the following steps: Step S1: Heat the aluminum ingot to melting in the melting furnace 1. The temperature of the melting furnace 1 is 750 °C, add a grain refiner and keep it static for heat preservation to make aluminum liquid; Step S2: Feed the aluminum liquid obtained in Step S1 successively into the inside of the degassing box 2 and the filtering device 3 to remove the gas and impurities in the aluminum liquid, and obtain the filtered aluminum liquid; Step S3: Adjust the relative angle of the two rollers 53 by starting the lifting oil cylinder 520. The roller angle is 0°, the closest distance between the rollers is 7 mm, and the thickness of the copper strip is 1.5 mm; Step S4: The copper plate strip is unfolded by the feeding device 4, passes through the guiding roller, the copper strip passes through the two support rods 52, and after passing through the groove 54 on the nozzle top plate 59, finally passes between the two rollers 53; Step S5: Preheat the nozzle at a temperature of 200 - 400 °C, and feed the filtered aluminum liquid into the preheated nozzle; Step S6: Start the two rollers 53 to carry out casting and rolling on the aluminum liquid and copper plate in the middle. The water-cooling components inside the rollers 53 will take away the heat of the aluminum liquid to solidify it; Step S7: The composite plate is trimmed by the shearing machine 6 and then coiled by the coiling machine 7. The coiling tension is controlled at 5 - 15 kN, and the copper-aluminum composite plate strip is obtained.

[0036] Comparative Example 2 A production method of a copper-aluminum composite plate, using a solid-liquid casting and rolling composite production line for a copper-aluminum composite plate as in Embodiment 1, includes the following steps: Step S1: Heat the aluminum ingot to melting in the melting furnace 1 at a temperature of 750°, add a grain refiner and keep it static for heat preservation to make aluminum liquid; Step S2: Pass the aluminum liquid obtained in Step S1 successively into the inside of the degassing box 2 and the filtering device 3 to remove the gas and impurities in the aluminum liquid, and obtain the filtered aluminum liquid; Step S3: Adjust the relative angle of the two rollers 53 by starting the lifting oil cylinder 520, the roller angle is 10°, the closest distance between the rollers is 7 mm, and the thickness of the copper strip is 1.5 mm; Step S4: The copper plate strip is unfolded by the feeding device 4, passes through the guiding roller, passes the copper strip through the two support rods 52, and finally passes between the two rollers 53 after passing through the groove 54 on the casting nozzle top plate 59; Step S5: Preheat the casting nozzle at a temperature of 200-400°C, and pass the filtered aluminum liquid into the preheated casting nozzle; Step S6: Start the two rollers 53 to cast and roll the aluminum liquid and copper plate in the middle, and the water-cooling component inside the roller 53 will take away the heat of the aluminum liquid to solidify it; Step S7: The composite plate is trimmed by the shearing machine 6 and then wound by the coiler 7, and the winding tension is controlled at 5-15 kN, and the copper-aluminum composite plate strip is obtained.

[0037] Comparative Example 3 A production method of a copper-aluminum composite plate, using a solid-liquid casting and rolling composite production line for a copper-aluminum composite plate as in Embodiment 1, includes the following steps: Step S1: Heat the aluminum ingot to melting in the melting furnace 1 at a temperature of 750°, add a grain refiner and keep it static for heat preservation to make aluminum liquid; Step S2: Pass the aluminum liquid obtained in Step S1 successively into the inside of the degassing box 2 and the filtering device 3 to remove the gas and impurities in the aluminum liquid, and obtain the filtered aluminum liquid; Step S3: Adjust the relative angle of the two rollers 53 by starting the lifting oil cylinder 520, the roller angle is 15°, the closest distance between the rollers is 7 mm, and the thickness of the copper strip is 1.5 mm; Step S4: The copper plate strip is unfolded by the feeding device 4, passes through the guiding roller, passes the copper strip through the two support rods 52, and finally passes between the two rollers 53 after passing through the groove 54 on the casting nozzle top plate 59; Step S5: Preheat the casting nozzle at a temperature of 200-400°C, and pass the filtered aluminum liquid into the preheated casting nozzle; Step S6: Start the two rolling rolls 53 to carry out casting and rolling on the molten aluminum and copper plate in the middle. The water-cooling component inside the rolling roll 53 will take away the heat of the molten aluminum to solidify it; Step S7: After the composite plate is trimmed by the shearing machine 6, it is coiled by the coiling machine 7. The coiling tension is controlled at 5 - 15 kN, and thus the copper-aluminum composite plate strip is obtained.

[0038] Comparative Example 4 A production method of a copper-aluminum composite plate uses a solid-liquid casting and rolling composite production line for a copper-aluminum composite plate as in Example 1, and includes the following steps: Step S1: Heat the aluminum ingot in the melting furnace 1 to melting. The temperature of the melting furnace 1 is 750 °C. Add a grain refiner and keep it static for heat preservation to make molten aluminum; Step S2: Pass the molten aluminum prepared in Step S1 successively into the inside of the degassing box 2 and the filtering device 3 to remove the gas and impurities in the molten aluminum, and obtain the filtered molten aluminum; Step S3: Adjust the relative angle of the two rolling rolls 53 by starting the lifting oil cylinder 520. The roll angle is 20 °, the closest distance between the rolls is 7 mm, and the thickness of the copper strip is 1.5 mm; Step S4: The copper plate strip is unrolled by the feeding device 4, passes through the guiding roller, passes the copper strip through the two support rods 52, and finally passes through the groove 54 on the casting nozzle top plate 59 and then through between the two rolling rolls 53; Step S5: Preheat the casting nozzle at a temperature of 200 - 400 °C, and pass the filtered molten aluminum into the preheated casting nozzle; Step S6: Start the two rolling rolls 53 to carry out casting and rolling on the molten aluminum and copper plate in the middle. The water-cooling component inside the rolling roll 53 will take away the heat of the molten aluminum to solidify it; Step S7: After the composite plate is trimmed by the shearing machine 6, it is coiled by the coiling machine 7. The coiling tension is controlled at 5 - 15 kN, and thus the copper-aluminum composite plate strip is obtained.

[0039] Comparative Example 5 A production method of a copper-aluminum composite plate uses a solid-liquid casting and rolling composite production line for a copper-aluminum composite plate as in Example 1, and includes the following steps: Step S1: Heat the aluminum ingot in the melting furnace 1 to melting. The temperature of the melting furnace 1 is 750 °C. Add a grain refiner and keep it static for heat preservation to make molten aluminum; Step S2: Pass the molten aluminum prepared in Step S1 successively into the inside of the degassing box 2 and the filtering device 3 to remove the gas and impurities in the molten aluminum, and obtain the filtered molten aluminum; Step S3: Adjust the relative angle of the two rolling rolls 53 by starting the lifting oil cylinder 520. The roll angle is 0 °, the closest distance between the rolls is 7 mm, and the thickness of the copper strip is 3 mm; Step S4: The copper plate strip is unwound by the feeding device 4, passes through the guiding roller, the copper strip passes through the two support rods 52, and after passing through the groove 54 on the casting nozzle top plate 59, finally passes between the two rollers 53; Step S5: Preheat the casting nozzle at a temperature of 200 - 400 °C, and introduce the filtered aluminum liquid into the preheated casting nozzle; Step S6: Start the two rollers 53 to carry out casting and rolling on the intermediate aluminum liquid and copper plate, and the water-cooling components inside the rollers 53 will take away the heat of the aluminum liquid to solidify it; Step S7: The composite plate is trimmed by the shearing machine 6 and then wound by the coiler 7, and the winding tension is controlled at 5 - 15 kN, thus obtaining the copper-aluminum composite plate strip.

[0040] Comparative Example Six A production method of a copper-aluminum composite plate, using a solid-liquid casting and rolling composite production line for a copper-aluminum composite plate as in Example One, includes the following steps: Step S1: Heat the aluminum ingot to melting in the melting furnace 1, the temperature of the melting furnace 1 is 750 °, add a grain refiner and keep it static for heat preservation to make aluminum liquid; Step S2: Introduce the aluminum liquid prepared in Step S1 into the inside of the degassing box 2 and the filtering device 3 in sequence to remove the gas and impurities in the aluminum liquid, and obtain the filtered aluminum liquid; Step S3: Adjust the relative angle of the two rollers 53 by starting the lifting oil cylinder 520, the roller angle is 10 °, the closest distance between the rollers is 7 mm, and the thickness of the copper strip is 3 mm; Step S4: The copper plate strip is unwound by the feeding device 4, passes through the guiding roller, the copper strip passes through the two support rods 52, and after passing through the groove 54 on the casting nozzle top plate 59, finally passes between the two rollers 53; Step S5: Preheat the casting nozzle at a temperature of 200 - 400 °C, and introduce the filtered aluminum liquid into the preheated casting nozzle; Step S6: Start the two rollers 53 to carry out casting and rolling on the intermediate aluminum liquid and copper plate, and the water-cooling components inside the rollers 53 will take away the heat of the aluminum liquid to solidify it; Step S7: The composite plate is trimmed by the shearing machine 6 and then wound by the coiler 7, and the winding tension is controlled at 5 - 15 kN, thus obtaining the copper-aluminum composite plate strip.

[0041] Comparative Example Seven A production method of a copper-aluminum composite plate, using a solid-liquid casting and rolling composite production line for a copper-aluminum composite plate as in Example One, includes the following steps: Step S1: Heat the aluminum ingot to melting in the melting furnace 1, the temperature of the melting furnace 1 is 750 °, add a grain refiner and keep it static for heat preservation to make aluminum liquid; Step S2: Feed the aluminum liquid obtained in Step S1 successively into the inside of the degassing box 2 and the filtering device 3 to remove the gas and impurities in the aluminum liquid, thereby obtaining the filtered aluminum liquid; Step S3: Adjust the relative angle of the two rollers 53 by starting the lifting oil cylinder 520. The roller angle is 15°, the closest distance between the rollers is 7 mm, and the thickness of the copper strip is 3 mm; Step S4: The copper plate strip is unrolled by the feeding device 4, and the copper strip passes through the two support rods 52 through the guiding rollers, and after passing through the groove 54 on the nozzle top plate 59, finally passes between the two rollers 53; Step S5: Preheat the nozzle at a temperature of 200 - 400 °C, and feed the filtered aluminum liquid into the preheated nozzle; Step S6: Start the two rollers 53 to carry out casting and rolling on the aluminum liquid and the copper plate in the middle. The water-cooling components inside the rollers 53 will take away the heat of the aluminum liquid to solidify it; Step S7: The composite plate is trimmed by the shearing machine 6 and then coiled by the coiling machine 7. The coiling tension is controlled at 5 - 15 kN, thus obtaining the copper-aluminum composite plate strip.

[0042] Comparative Example 8 A production method of a copper-aluminum composite plate, using a solid-liquid casting and rolling composite production line for a copper-aluminum composite plate as in Example 1, includes the following steps: Step S1: Heat the aluminum ingot to melting in the melting furnace 1. The temperature of the melting furnace 1 is 750 °C, add a grain refiner and keep it static for heat preservation to make aluminum liquid; Step S2: Feed the aluminum liquid obtained in Step S1 successively into the inside of the degassing box 2 and the filtering device 3 to remove the gas and impurities in the aluminum liquid, thereby obtaining the filtered aluminum liquid; Step S3: Adjust the relative angle of the two rollers 53 by starting the lifting oil cylinder 520. The roller angle is 20°, the closest distance between the rollers is 7 mm, and the thickness of the copper strip is 3 mm; Step S4: The copper plate strip is unrolled by the feeding device 4, and the copper strip passes through the two support rods 52 through the guiding rollers, and after passing through the groove 54 on the nozzle top plate 59, finally passes between the two rollers 53; Step S5: Preheat the nozzle at a temperature of 200 - 400 °C, and feed the filtered aluminum liquid into the preheated nozzle; Step S6: Start the two rollers 53 to carry out casting and rolling on the aluminum liquid and the copper plate in the middle. The water-cooling components inside the rollers 53 will take away the heat of the aluminum liquid to solidify it; Step S7: The composite plate is trimmed by the shearing machine 6 and then coiled by the coiling machine 7. The coiling tension is controlled at 5 - 15 kN, thus obtaining the copper-aluminum composite plate strip.

[0043] The copper-aluminum composite plates prepared in Examples 2 to 5 and Comparative Examples 1 to 8 were subjected to performance tests including density, grain size, tensile strength, shear strength, interfacial bonding quality, and reflow situation. The specific methods are as follows: (1) Density First, the test specimen to be tested was cleaned to remove oil stains and impurities on the surface. Then, the mass of the specimen was measured using an accurate electronic balance (denoted as m). Next, the specimen was completely immersed in water with a known density, ensuring that there were no bubbles on the surface of the specimen, and the volume corresponding to the buoyancy of the specimen in the liquid was measured (denoted as V). Finally, according to Archimedes' principle, the density of the specimen (ρ = m / V) was calculated, and the density was obtained by comparing with the theoretical density or standard density.

[0044] (2) Grain size First, a small piece was cut from the test specimen to be tested and subjected to grinding and polishing until the surface was smooth and free of scratches. Then, the specimen was etched with an appropriate etchant to reveal the grain boundaries. Next, the specimen was placed under a microscope and the grain size was measured using the measuring tools or image processing software provided with the microscope.

[0045] (3) Tensile strength The tensile strength test of the copper-aluminum composite plate should follow relevant standards such as GB / T 228. First, a tensile specimen meeting the standards was cut from the test specimen to be tested. Then, the specimen was subjected to a tensile test using a universal tensile testing machine, and the stress-strain curve during the tensile process was recorded. Finally, the maximum stress point was found from the curve, which was the tensile strength.

[0046] (4) Shear strength The shear strength test of the copper-aluminum composite plate can be carried out using a special shear test device. First, a shear specimen meeting the standards was cut from the test specimen to be tested. Then, the specimen was placed in the shear test device, and a shear force perpendicular to the plane of the specimen was applied. The maximum shear force during the shear process of the specimen was recorded, and the shear strength was calculated based on the size of the specimen.

[0047] (5) Peel strength The copper-aluminum composite plate was cut into specified dimensions, and a notch was made at one end for the peel test. Using a universal tensile testing machine, such as a device with the model SHIMADZU AG-I 250KN, the specimen was installed on the tensile testing machine to ensure that the specimen was firmly fixed. The peel direction was 90°, the peel speed was set at 10 mm / min, and the peel test was started. The change in the force value during the peel process was recorded to obtain the peel strength (denoted as N / mm).

[0048] (6) Interfacial bonding quality The interfacial bonding quality of copper-aluminum composite plates can be evaluated through peel tests or shear tests. Based on the magnitude of the peel force or shear strength, the quality of the interfacial bonding can be assessed.

[0049] (7) Reflux situation After the casting and rolling are completed, observe whether there are solidified aluminum blocks around the casting nozzle to determine whether aluminum liquid reflux occurs during the casting and rolling process.

[0050] Example Copper strip thickness (mm) Rolling angle Relative density (%) Grain size (μm) Tensile strength (MPa) Shear strength (MPa) Peel strength (N / mm) Interface bonding quality Reflow situation Example Two 2 0° 96.2 12.5 200 83 52 General With reflow Example Three 2 10° 98.5 9.7 240 110 65 Good Without reflow Example Four 2 15° 99.3 7.5 270 136 78 Excellent Without reflow Example Five 2 20° 99.1 7.8 255 128 72 Excellent Without obvious reflow Comparative Example One 1.5 0° 96.5 12.0 198 85 55 General With reflow Comparative Example Two 1.5 10° 98.8 9.5 245 115 62 Good Without reflow Comparative Example Three 1.5 15° 99.5 7.0 275 143 77 Excellent Without reflow Comparative Example Four 1.5 20° 99.2 7.2 253 137 75 Excellent Without obvious reflow Comparative Example Five 3 0° 96.0 13.0 192 84 55 General Without obvious reflow Comparative Example Six 3 10° 98.0 10.0 237 107 68 Good Without reflow Comparative Example Seven 3 15° 99.0 8.0 260 138 86 Excellent Without reflow Comparative Example Eight 3 20° 99.0 7.6 254 128 72 Excellent Without obvious reflow From the data in Table 1, it can be concluded that when the relative distance between the rollers is 7 mm, for copper strips with different thicknesses (1.5 mm, 2 mm, 3 mm), when the relative tilt angle of the rollers is 15°, the density of the composite interface reaches the highest, the grain size is the finest, and the tensile strength, peel strength, and shear strength also reach or are close to the highest values, and the reflux problem is completely avoided; Specifically: For the case where the thickness of the copper strip is 2 mm, the performance of the composite plate under 15° inclined rolling is optimal, with a density as high as 99.3%, a grain size as fine as 7.5 μm, a tensile strength and a shear strength reaching 270 MPa and 136 MPa respectively, and a peel strength of 78 N / mm.

[0051] For the cases where the thicknesses of the copper strips are 1.5 mm and 3 mm, 15° inclined rolling also shows excellent comprehensive performance. Although the specific values are different, they are all better than those under other rolling angles.

[0052] In addition, when the relative tilt angle of the rollers is 10°, the performance of the composite plate can still be improved well, but the grain size and bonding strength (i.e., shear strength) are slightly lower than the levels at 15°. When the relative tilt angle of the rollers is 20°, although the composite plate still shows good comprehensive performance, due to the excessive tilt angle, the internal stress distribution of the material is uneven, resulting in the overall performance being slightly inferior to that at 15°.

[0053] In summary, 15° inclined rolling is the best choice for the performance of copper-aluminum composite plates with different thicknesses of copper strips (1.5 mm, 2 mm, 3 mm) when the relative distance between the rollers is 7 mm.

[0054] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. Copper-aluminum composite plate casting and rolling mill, comprising a frame (51); Two rolling rolls (53), the two rolling rolls (53) being located inside the frame (51); A driving mechanism for driving two adjacent rolling rolls (53) to rotate synchronously and in opposite directions; It is characterized in that It further includes a casting nozzle located on one side of two rolling rolls (53). An inlet, an outlet and a connecting groove are formed inside the casting nozzle. The connecting groove is used to connect the outlet and the inlet, and the outlet of the casting nozzle points between the two rolling rolls (53); The axial centerlines of the two rolling rolls (53) are parallel, and the inclination angle between the plane where the axial centerlines of the two rolling rolls (53) are located and the vertical line of the horizontal plane is α, and the angle of α is between 0° and 20°; Both sides of the casting nozzle close to the two rolling rolls (53) are inclined, which is used to place the casting nozzle between the two rolling rolls (53). A groove (54) is formed on the casting nozzle, and the groove (54) is communicated with the outlet. The groove (54) is used to pass through the copper strip to make the aluminum liquid contact the copper strip in advance, while preventing the backflow of the aluminum liquid and increasing the contact time between the aluminum liquid and the copper strip.

2. The copper-aluminum composite plate casting and rolling mill according to claim 1, characterized in that Water cooling components are arranged inside both of the two rolling rolls (53); The bottom of the frame (51) is fixedly connected with a movable plate (517). One end of the movable plate (517) is movably hinged with a fixed plate (518). The bottom of the fixed plate (518) is fixedly connected with a plurality of support bars (519), and the plurality of support bars (519) are arranged in parallel; A plurality of jacking oil cylinders (520) are installed on the top of the fixed plate (518). The output end of the jacking oil cylinder (520) is fixedly connected with a movable connecting part (523). The bottom of the movable plate (517) is fixedly connected with a plurality of limit blocks (522). A fixed connecting part (524) is fixedly connected inside the plurality of limit blocks (522). The plurality of movable connecting parts (523) and the plurality of fixed connecting parts (524) correspond one by one, and the movable connecting part (523) and the fixed connecting part (524) are hinged.

3. The copper-aluminum composite plate casting and rolling mill according to claim 2, characterized in that One side of the frame (51) is fixedly connected with a shaft frame (515). A feeding roller (516) is rotatably installed inside the two shaft frames (515) together. The processed copper-aluminum composite plate is sent out through the feeding roller (516). One side of the frame (51) is fixedly connected with two mounting frames (511). The two mounting frames (511) correspond to the two rolling rolls (53) respectively. Slide rails (513) are installed on the two mounting frames (511). A sliding block (512) is fixedly connected to the moving part of the slide rail (513). A heating nozzle (521) is installed on one side of the sliding block (512). The input end of the heating nozzle (521) is connected with an air inlet pipe (514). One end of the air inlet pipe (514) is connected with a gas storage tank, and liquefied gas is stored inside the gas storage tank.

4. The copper-aluminum composite plate casting and rolling mill according to claim 3, characterized in that A fixed slide rail (55) is installed on one side of the frame (51). The top of the movable end of the fixed slide rail (55) is fixedly connected with a mounting seat (56), and the casting nozzle is installed on the top of the mounting seat (56); The casting nozzle includes a detachable casting nozzle bottom plate (57), a casting nozzle middle plate (58) and a casting nozzle top plate (59). The groove (54) is formed on the casting nozzle top plate (59). The connecting groove is formed inside the casting nozzle middle plate (58). A plurality of flow guiding blocks (510) arranged in a rectangular array are arranged inside the connecting groove, and the flow guiding blocks (510) are triangular.

5. The copper-aluminum composite plate casting and rolling mill according to claim 4, characterized in that The casting nozzle bottom plate (57), the casting nozzle middle plate (58), the flow guiding block (510), and the casting nozzle top plate (59) are all made of high-temperature resistant ceramic fiber; The width of the groove (54) is D, and the length of D is between 0 - 8 mm. The length of the groove (54) is H, and the length of H matches the width of the copper strip.

6. A solid-liquid casting and rolling composite production line for copper-aluminum composite plates, comprising the copper-aluminum composite plate casting and rolling mill (5) according to any one of claims 1-5, characterized in that The production line further includes a melting furnace (1), a degassing box (2), a filtering device (3), a feeding device (4), a shearing machine (6), a coiling machine (7), and a holding furnace; The melting furnace (1) is used for melting and purifying aluminum ingots; The holding furnace is connected to the output port of the melting furnace (1) and is used for precipitating impurities inside the aluminum liquid and keeping the aluminum liquid warm; The degassing box (2) is connected to the output port of the holding furnace and is used for degassing the aluminum liquid; The filtering device (3) is connected to the output port of the degassing box (2) and is used for removing impurities from the aluminum liquid; The feeding device (4) is used for continuously feeding the copper strip; The casting-rolling mill (5) is located downstream of the filtering device (3) and is used for solid-liquid casting-rolling of molten aluminum liquid and the copper strip to process into a copper-aluminum composite plate; The shearing machine (6) and the coiling machine (7) are respectively used for fixed-length cutting and coiling of the composite plate, and coiling of the finished copper-aluminum alloy plate.

7. A production method for copper-aluminum composite plates, using the solid-liquid casting and rolling composite production line for copper-aluminum composite plates according to claim 6, characterized in that It includes the following steps: Step S1: Heat the aluminum ingot to melting in the melting furnace (1), add a grain refiner and keep it static for heat preservation to make aluminum liquid; Step S2: Pass the aluminum liquid obtained in Step S1 into the inside of the degassing box (2) and the filtering device (3) in sequence to remove the gas and impurities in the aluminum liquid to obtain the filtered aluminum liquid; Step S3: Adjust the relative angle of the two rolling rolls (53) by starting the lifting oil cylinder (520); Step S4: The copper strip is unrolled by the feeding device (4), passes through the guiding roller, passes the copper strip through the two support rods (52), and finally passes through the groove (54) on the casting nozzle top plate (59) and then passes between the two rolling rolls (53); Step S5: Preheat the casting nozzle at a temperature of 200 - 400 °C, and pass the filtered aluminum liquid into the preheated casting nozzle; Step S6: Start the two rolling rolls (53) to carry out casting-rolling on the middle aluminum liquid and the copper plate. The water-cooling component inside the rolling roll (53) will take away the heat of the aluminum liquid to make it solidify and crystallize; Step S7: The composite plate is trimmed by the shearing machine (6) and then coiled by the coiling machine (7), and the coiling tension is controlled at 5 - 15 kN.

8. The production method of the copper-aluminum composite plate according to claim 7, characterized in that, In Step S2, the aluminum content of the aluminum liquid is greater than 99.6%, and the temperature of the melting furnace (1) is 740° - 760°; In Step S4, the minimum distance between the two rolling rolls (53) is between 4 - 25 mm, and the thickness of the copper strip in Step S4 is between 2 - 7 mm.

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