A casting-rolling composite system
By combining the design of the differential diameter roller system with the electro-treatment system, the problem of poor wettability between the molten metal and the strip during the casting-rolling composite process was solved, achieving high-quality composite interface bonding and improving the yield and performance of the composite sheet.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NORTHEASTERN UNIV CHINA
- Filing Date
- 2026-04-22
- Publication Date
- 2026-06-02
AI Technical Summary
During the casting and rolling composite process, the poor wettability between the molten metal and the surface of the strip leads to weak bonding at the composite interface, and even local unbonded defects, affecting the overall performance and yield of the composite plate.
An asynchronous rolling state is achieved by adopting a different diameter roll system. The combination of heating the upper casting roll and cooling the lower casting roll increases the deformation resistance and extends the contact time between the molten metal and the strip. Combined with the application of DC or pulse current by the electrical treatment system, the wetting of the strip surface by the molten metal is promoted. At the same time, the hydraulic cylinder drives the upper casting roll to stabilize the heating gap and roll gap, preventing the molten metal from leaking out.
It significantly improves the bonding quality and stability of the composite interface, ensures the metallurgical bonding between the molten metal and the strip, and improves the yield and performance of the composite plate.
Smart Images
Figure CN224309576U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of casting and rolling technology, and relates to a casting and rolling composite system. Background Technology
[0002] The casting-rolling composite method is a highly efficient technology for preparing dissimilar metal layered composite materials. The casting-rolling process involves feeding the strip from above the casting nozzle between the upper and lower casting rolls of a casting mill, allowing it to initially contact the molten metal. The molten metal solidifies under the combined cooling effect of the casting rolls and the strip, undergoing plastic deformation simultaneously with the strip, thus forming a copper-aluminum layered composite material with good interfacial bonding. This technology offers significant advantages such as low equipment investment, low production cost, and high interfacial bonding strength, providing an effective approach for the low-cost, high-quality preparation of dissimilar metal layered composite materials.
[0003] However, certain technical bottlenecks still exist in actual production applications. Due to the poor wettability between the molten metal and the surface of the strip, it is difficult to achieve sufficient metallurgical bonding when the two come into contact in the casting and rolling zone, resulting in weak bonding force at the composite interface and even local unbonded defects, which seriously affect the overall performance and yield of the composite plate. Utility Model Content
[0004] A casting-rolling composite system for casting and rolling composite of strip and molten metal, including a casting mill and strip pinch rolls;
[0005] The strip feeding rollers are positioned above the casting and rolling mill and are used to transport the strip into the casting and rolling mill.
[0006] The casting and rolling mill includes an upper casting roll, a lower casting roll, a casting nozzle, a flow channel, and a first heating device; the flow channel is connected to the casting nozzle, and the lip of the casting nozzle extends into the roll gap area between the upper and lower casting rolls; the upper casting roll is located above the lower casting roll, and the diameter of the upper casting roll is larger than that of the lower casting roll; the upper casting roll is a solid roll, and the lower casting roll has a cooling water pipe inside for introducing cooling water; the first heating device is located on one side of the upper casting roll and is used to heat the surface of the upper casting roll.
[0007] As a supplement to the technical solution of this utility model, the casting nozzle has a flat wedge-shaped cavity structure, including an upper lip plate and a lower lip plate symmetrically arranged on the upper and lower sides, forming a flat flow channel for the flow of molten metal, and the outlet of the flow channel is the lip.
[0008] The upper lip plate is located below the upper casting roll, with its front end face parallel to the surface of the upper casting roll and a gap reserved there; the lower lip plate is located above the lower casting roll, with its front end face parallel to the surface of the lower casting roll and a gap reserved there; the front end extension length of the lower lip plate is greater than that of the upper lip plate.
[0009] As a supplement to the technical solution of this utility model, the casting and rolling mill also includes a frame archway, a roll bearing seat, a hydraulic cylinder, and a power unit;
[0010] Both ends of the upper and lower casting rolls are equipped with roll bearing seats. The frame archway has a window. The roll bearing seat located at the end of the upper casting roll is embedded in the window of the frame archway and can slide up and down along the window. The hydraulic cylinder is located at the upper end of the frame archway, and the piston rod of the hydraulic cylinder is connected to the roll bearing seat located at the end of the upper casting roll, which is used to drive the upper casting roll to rise and fall. The roll bearing seat located at the end of the lower casting roll is fixedly connected to the frame archway.
[0011] The power unit has two sets and is respectively connected to the upper casting roll and the lower casting roll. It includes a main motor, a reducer, and a universal coupling. The output shaft of the main motor is fixedly connected to the input shaft of the reducer through the coupling. The output shaft of the reducer is connected to one end of the universal coupling, and the other end of the universal coupling is connected to the roll neck of the roll.
[0012] As a supplement to the technical solution of this utility model, the end of the first heating device is connected to the roll bearing seat disposed at the end of the upper casting roll. The first heating device includes a fixed bracket and a heating body. The heating body is disposed on the fixed bracket, and the end of the fixed bracket is connected to the roll bearing seat, so that the heating body is suspended in the upper area of the upper casting roll. The heating body is a flat electromagnetic induction heater or an infrared heating plate.
[0013] As a supplement to the technical solution of this utility model, the ratio of the diameter of the upper casting roll to the diameter of the lower casting roll is 1.1 to 1.4.
[0014] As a supplement to the technical solution of this utility model, the casting and rolling mill also includes an emulsion spraying system, which includes an emulsion conveying pipeline and narrow-slit spray nozzles installed on the emulsion conveying pipeline.
[0015] The width of the upper casting roll is greater than the width of the strip. The emulsion conveying pipeline is located on one side of the upper casting roll. The spraying area of the narrow-slit spray nozzle corresponds to the area on the surface of the upper casting roll that does not contact the strip.
[0016] The narrow-slit spray nozzle is located on the side of the upper casting roll away from the casting nozzle and below the first heating device.
[0017] As a supplement to the technical solution of this utility model, the casting and rolling mill also includes a non-contact infrared temperature sensor, which is set on the frame and located above the casting nozzle. The detection end of the non-contact infrared temperature sensor is set towards the surface of the strip to measure the temperature of the strip surface. The detection position of the non-contact infrared temperature sensor is located on the strip surface 2 to 10 mm above the casting nozzle.
[0018] As a supplement to the technical solution of this utility model, a second heating device is also included. The second heating device has the same structure as the first heating device. It is disposed on one side of the metal plate and located above the non-contact infrared temperature sensor, and is used to heat the metal plate.
[0019] The heating element of the first heating device is 15-20 mm away from the surface of the upper casting roll;
[0020] The heating element of the second heating device is 15-20 mm away from the surface of the plate and strip.
[0021] As a supplement to the technical solution of this utility model, it also includes an electrical processing system, which includes a power supply, a first conductive element, and a second conductive element;
[0022] The first end of the first conductive element is electrically connected to the power supply, and the second end is electrically connected to the board.
[0023] The first end of the second conductive element is connected to the power source, and the second end is immersed in the molten metal in the flow channel.
[0024] As a supplement to the technical solution of this utility model, the first conductive element includes a first wire and a carbon brush, wherein the carbon brush is disposed on one side of the strip and in contact with the surface of the strip; the first wire is connected between the power supply and the carbon brush.
[0025] The second conductive element includes a second wire and a graphite electrode. The lower part of the graphite electrode is immersed in the molten metal in the flow channel, and the second wire is connected between the power source and the graphite electrode.
[0026] Beneficial effects: The casting-rolling composite system disclosed in this utility model has the following advantages:
[0027] 1. By designing an asynchronous rolling system with varying diameter rolls, the actual deformation of the strip with higher deformation resistance is effectively increased, reducing the uneven deformation of the two metals during casting and rolling, and significantly improving the bonding quality and stability of the composite interface. Simultaneously, the heating of the upper casting roll raises the strip temperature, reducing the cooling rate of the molten metal; the cooling of the lower casting roll shortens the contact arc length between the melt and the lower casting roll, extending the contact time between the melt and the strip, ensuring sufficient wetting of the strip surface by the molten metal, and forming a stable and dense metallurgical bonding interface.
[0028] 2. By changing the hydraulic cylinder drive object from the traditional lower casting roll to the upper casting roll, the impact load when the strip enters the casting zone avoids the lower casting roll hydraulic cylinder retraction, ensuring a constant gap between the lower casting roll and the lower lip plate, thus solving the technical problem of molten metal leakage. The first heating device rises and falls synchronously with the roll bearing seat at the end of the upper casting roll to maintain a constant heating distance and ensure heating quality. The second heating device compensates for the heating and precisely controls the temperature of the strip. The circumferentially separated layout, with the first heating device located in the upper half of the roll and the emulsion spray in the lower half, achieves functional zoning for heating and cooling. This avoids the emulsion interfering with heating efficiency and utilizes gravity-assisted drainage to meet the edge lubrication requirements.
[0029] 3. Two independent power units can control the speed of the upper and lower casting rolls respectively, so as to achieve precise adjustment of the asynchronous ratio and thus regulate the thickness ratio of dissimilar metal layers to meet the requirements of different product specifications.
[0030] 4. The electrotreatment system can apply DC or pulsed current to further promote the wetting speed of the molten metal on the surface of the strip, improve the wetting effect, and provide electrochemical assistance for the formation of a high-quality composite interface. Attached Figure Description
[0031] Figure 1 This is a three-dimensional structural diagram of the casting and rolling mill of this utility model.
[0032] Figure 2 This is a schematic diagram showing the installation positions of the first heating device and the emulsion spraying system in the casting and rolling mill of this utility model.
[0033] Figure 3 This is a schematic diagram showing the installation position of the non-contact infrared temperature sensor in the casting and rolling mill of this utility model.
[0034] Figure 4 This is a side view of the casting and rolling mill structure of this utility model.
[0035] Figure 5 This is a schematic diagram of the casting-rolling composite system of this utility model.
[0036] In the picture:
[0037] 100. Casting and rolling mill; 101. Frame archway; 102. Roll bearing housing; 103. Hydraulic cylinder; 104. Window; 105. Main motor; 106. Reducer; 107. Universal coupling; 108. Upper casting roll; 109. Lower casting roll; 110. Casting nozzle; 111. First heating device; 112. Upper lip plate; 113. Lower lip plate; 114. Emulsion conveying pipeline; 115. Narrow slit spray nozzle; 116. Non-contact infrared temperature sensor; 117. Second heating device;
[0038] 200. Warm rolling mill;
[0039] 300. Plate rolling machine;
[0040] 400. Power supply; 401. Carbon brush; 402. First conductive component; 403. Second conductive component;
[0041] 500. Strip feeding roller. Detailed Implementation
[0042] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.
[0043] like Figures 1 to 5 As shown, this utility model discloses a casting and rolling composite system, including a casting and rolling mill 100 and strip pinch rolls 500;
[0044] The strip pinch roll 500 is positioned above the casting and rolling mill 100 and is used to transport the strip into the casting and rolling mill 100.
[0045] The casting and rolling mill 100 includes an upper casting roll 108, a lower casting roll 109, a casting nozzle 110, a flow channel, and a first heating device 111.
[0046] The upper casting roll 108 is located above the lower casting roll 109, and the diameter of the upper casting roll 108 is larger than that of the lower casting roll 109. The upper casting roll 108 is a solid roll. The lower casting roll 109 is provided with a cooling water pipe for introducing cooling water. By introducing cooling water into the lower casting roll 109, the temperature of the surface of the lower casting roll 109 is controlled.
[0047] The flow channel is connected to the casting nozzle 110 and is used to transport the molten metal in the smelting furnace to the casting nozzle 110.
[0048] The casting nozzle 110 has a flat wedge-shaped cavity structure and extends towards the casting roll group along the melt conveying direction. Its end lip extends into the roll gap entrance area between the upper casting roll 108 and the lower casting roll 109 to achieve precise conveying of the molten metal.
[0049] The casting nozzle 110 includes an upper lip plate 112 and a lower lip plate 113. The upper lip plate 112 is correspondingly attached to the lower side of the upper casting roll 108 and has a gap reserved between it and the surface of the upper casting roll 108. The lower lip plate 113 is correspondingly attached to the upper side of the lower casting roll 109 and has a gap reserved between it and the surface of the lower casting roll 109. The upper lip plate 112 and the lower lip plate 113 are symmetrically arranged vertically and form a flat flow channel for the flow of molten metal between them. The outlet position of the flow channel during the travel of the upper lip plate 112 and the lower lip plate 113 is the lip opening, which is directly opposite the center area of the roll gap of the casting roll assembly.
[0050] The upper lip plate 112 is located below the upper casting roll 108, and the front end face of the upper lip plate 112 is arranged parallel to the roll surface of the upper casting roll 108, with a pre-reserved sealing gap between them; the lower lip plate 113 is located above the lower casting roll 109, and the front end face of the lower lip plate 113 is arranged parallel to the roll surface of the lower casting roll 109; the front end extension length of the lower lip plate 113 is greater than the front end extension length of the upper lip plate 112, and the upper lip plate 112 is retracted towards the entrance side of the casting roll group relative to the upper lip plate 112, forming a stepped staggered layout between the upper lip plate 112 and the lower lip plate 113, and forming an open feeding channel for the strip to pass through between the upper lip plate 112 and the upper casting roll 108.
[0051] The upper lip plate 112 is shorter than the lower lip plate 113. During the casting and rolling process, the molten metal is transported through the channel between the upper lip plate 112 and the lower lip plate 113 to the gap between the rolls of the casting roll assembly. The strip is transported along the surface of the lower casting roll 109 to the gap through the open feeding channel in front of the upper lip plate 112, where it precisely merges with the molten metal to complete the casting and rolling composite. The shape of the casting and rolling zone causes the molten metal to contact the strip first, which is beneficial to improving the wetting effect of the molten metal on the strip. After the molten metal is cooled by the strip, it then contacts the lower casting roll 109, avoiding the possibility of adhesion between the molten metal and the lower casting roll 109.
[0052] The first heating device 111 is located on one side of the upper casting roll 108 and is used to heat the surface of the upper casting roll 108 so that its surface temperature reaches the temperature range of 85 to 180°C.
[0053] This application, through the design of the roll diameters of the upper casting roll 108 and the lower casting roll 109, enables the dissimilar composite plate to form an asynchronous rolling state during the casting and rolling deformation process. This increases the actual deformation amount of the strip with higher deformation resistance, effectively reduces the deformation non-uniformity of the two metals during the casting and rolling process, and significantly improves the bonding quality and stability of the composite interface. Since the upper casting roll 108 is a solid roll, heating the upper casting roll 108 raises the temperature of the strip, further reducing the cooling rate of the molten metal.
[0054] On the other hand, due to the smaller diameter of the lower casting roll 109, the cooling contact arc length between it and the molten metal is shortened, which slows down the temperature drop rate of the molten metal in the casting zone and extends the effective length for the metal to remain in the molten state. This prolongs the contact time between the molten metal and the strip, further enhancing the wetting and spreading effect of the molten metal on the strip surface and providing sufficient assurance for the formation of a stable and dense metallurgical bond at the copper-aluminum interface. In addition, the shorter cooling contact arc length between the molten metal and the lower casting roll 109 shortens the solidification distance of the metal on the roll surface and results in a thinner solidified layer, broadening the product's applicability and application scenarios.
[0055] As a supplement to the above technical solution, the casting and rolling mill 100 also includes a frame archway 101, a roll bearing seat 102, a hydraulic cylinder 103, and a power unit.
[0056] The power unit has two sets, which are respectively connected to the upper casting roll 108 and the lower casting roll 109, and are used to independently drive the upper casting roll 108 and the lower casting roll 109 to rotate. The power unit includes a main motor 105, a reducer 106, and a universal coupling 107;
[0057] The output shaft of the main motor 105 is fixedly connected to the input shaft of the reducer 106 via a coupling. The output shaft of the reducer 106 is connected to one flange of the universal coupling 107, and the other end of the universal coupling 107 is connected to the roll neck of the rolling mill via a key or flange. By setting up two sets of power units, the speed of the casting roll can be controlled separately, and the asynchronous ratio can be adjusted to achieve the control of the copper-aluminum layer thickness ratio.
[0058] Both ends of the upper casting roll 108 and the lower casting roll 109 are installed in the roll bearing housing 102. The frame archway 101 is provided with a window 104. The roll bearing housing 102 is embedded in the window 104 of the frame archway 101 and can slide up and down along the window 104. The top of the roll bearing housing 102 installed at the end of the upper casting roll 108 is connected to the hydraulic cylinder.
[0059] The connection between the roll bearing seat 102 at the end of the lower casting roll 109 and the frame arch 101 can be achieved by bolting a bolt through the frame arch 101 to the roll bearing seat 102 at the end of the lower casting roll 109, thus fixing the roll bearing seat 102 at the end of the lower casting roll 109 to the frame arch 101 and fixing the height of the lower casting roll 109. Alternatively, a bolt structure can be used to connect the roll bearing seat 102 at the end of the lower casting roll 109 to the frame arch 101.
[0060] The hydraulic cylinder 103 is located at the upper end of the frame archway 101, and the piston rod of the hydraulic cylinder 103 is connected to the roll bearing seat 102 located at the end of the upper casting roll 108, for driving the upper casting roll 108 to rise and fall.
[0061] Through the design of the above technical solution, the driving object of the hydraulic cylinder 103 is changed from the traditional lower casting roll 109 to the upper casting roll 108. This improvement can effectively avoid the impact load generated when the strip enters the casting zone, which would cause the hydraulic cylinder 103 of the lower casting roll 109 to retract, thereby eliminating the gap between the lower casting roll 109 and the lower lip plate 113 caused by the position change of the lower casting roll 109. The elimination of this gap prevents casting defects such as cold shuts and steam drums caused by the overflow of molten metal from this point, and significantly improves the finished quality of the strip.
[0062] As a supplement to the above technical solution, the end of the first heating device 111 is connected to the roll bearing seat 102 at the end of the upper casting roll 108, so that the lifting and lowering of the roll bearing seat 102 can drive the first heating device 111 to lift and lower synchronously, maintaining a constant distance between the first heating device 111 and the upper casting roll 108, and ensuring heating quality. The first heating device 111 is disposed in the upper region of the upper casting roll 108. The first heating device 111 includes a fixed bracket and a heating body. The heating body is disposed on the fixed bracket, and the end of the fixed bracket is connected to the roll bearing seat 102 at the end of the upper casting roll 108, so that the heating body is suspended in the upper region of the upper casting roll 108. The heating body can be a flat electromagnetic induction heater or an infrared heating plate.
[0063] When a flat-plate electromagnetic induction heater is used, its internal heating coil is wound in a planar manner, forming a rectangular structure, which is used to heat the surface of the upper casting roll 108.
[0064] Preferably, the distance between the heating unit and the surface of the upper casting roll 108 is 15-20mm, which can ensure heating efficiency while ensuring safety in use and prevent the heating unit from burning out.
[0065] Two sets of hydraulic cylinders 103 are provided to synchronously control the lifting and lowering of the two sets of roll bearing seats 102 on the upper casting roll 108. This can be achieved by installing a flow divider / combiner valve in the oil circuit to evenly distribute the flow to the two sets of hydraulic cylinders 103, enabling their piston rods to extend and retract synchronously. Alternatively, each cylinder can be equipped with an independent proportional valve / servo valve, along with displacement sensors / encoders, and closed-loop control can be achieved through a PLC / controller. The synchronous lifting and lowering function of the two sets of hydraulic cylinders 103 is a conventional technique in this field and will not be described in detail here.
[0066] As a supplement to the above technical solution, the diameter ratio of the upper casting roll 108 to the lower casting roll 109 is 1.1 to 1.4. If the roll diameter ratio is too large, it will lead to an excessive difference in linear speed between the upper and lower rolls, resulting in additional shear force between the strip and the molten aluminum, which can easily cause strip wrinkles, misalignment, or even tearing of the composite interface.
[0067] In the above technical solution, due to the setting of the spray device, heating the upper rolling roll by the first heating device 111 alone may result in low heating efficiency. As a supplement to the technical solution of this utility model, a second heating device 117 is also included. The second heating device 117 has the same structure as the first heating device 111. It is set in the area between the strip pinch roll 500 and the casting nozzle 110 and is used to compensate for heating the metal plate. The setting of the second heating device 117 enables further precise control of the surface temperature of the strip.
[0068] As a supplement to the technical solution of this utility model, an electrical treatment system is also included. The electrical treatment system includes a power supply 400, a first conductive element 402, and a second conductive element 403. A first end of the first conductive element 402 is connected to the power supply 400, and a second end is electrically connected to the surface of the strip. A first end of the second conductive element 403 is connected to the power supply 400, and a second end is immersed in the molten metal in the flow channel. The electrical treatment system allows for the application of direct current or pulsed current, which can further promote the wetting speed of the molten metal on the strip surface and improve the wetting effect.
[0069] The first conductive element 402 includes a first wire and a carbon brush 401. The carbon brush 401 is disposed on one side of the strip and in contact with the surface of the strip. The first wire is connected between the power supply 400 and the carbon brush 401 to conduct electricity between the power supply 400 and the carbon brush 401.
[0070] The second conductive element 403 includes a second wire and a graphite electrode. The lower part of the graphite electrode is immersed in the molten metal in the flow channel. The second wire is connected between the power supply 400 and the graphite electrode, so that the power supply 400 and the molten metal are electrically connected.
[0071] In addition, the first conductor can also be directly connected to the roller shaft of the strip pinch roller 500. The current passes through the roller shaft of the strip pinch roller 500, through the bearing and roller body, and finally to the metal plate.
[0072] As a supplement to the technical solution of this utility model, the casting and rolling mill 100 also includes an emulsion spraying system, which includes an emulsion conveying pipeline 114 and a narrow-slit spray nozzle 115 installed thereon.
[0073] The axial length of the upper casting roll 108 is greater than the width of the strip, and the lip width is also greater than the width of the strip. The length of the first heating device 111 should be greater than the width of the strip to achieve full coverage heating of the surface of the upper casting roll 108 in contact with the strip.
[0074] The emulsion delivery pipeline 114 is located on one side of the upper casting roll 108, and the spraying area of the narrow-slit spray nozzle 115 on it corresponds to the exposed area of the upper casting roll 108 surface that is not in contact with the strip. Through this arrangement, the spraying system sprays emulsion onto this part of the roll surface during the rolling process, achieving a dual function: on the one hand, it lubricates the roll surface, reduces friction, and prevents aluminum adhesion; on the other hand, it locally cools the roll body, further preventing the upper casting roll 108 from thermally adhering to the molten metal environment in the non-contact area, while also avoiding excessive local temperature rise on the roll surface that could lead to coarse metal grains, thereby ensuring the internal structure quality and surface quality of the cast and rolled strip.
[0075] As a supplement to the above technical solution, the strip is introduced into the upper casting roll 108 on the side near the casting nozzle 110, and the strip contacts the outer edge of the upper casting roll 108 on this side and enters the rolling zone.
[0076] To prevent the emulsion from flowing into the contact arc area between the strip and the roll and its vicinity, the narrow-slit spray nozzle 115 is located on the other side of the upper casting roll 108, i.e., the back side relative to the strip entry direction, and below the first heating device 111. This arrangement ensures that the emulsion effectively lubricates and cools the non-working area of the roll while dripping naturally under gravity, without flowing circumferentially along the roll surface to the strip contact area, thus preventing the emulsion from interfering with the casting and rolling process.
[0077] The design of the emulsion spraying system, the first heating device 111, and the non-contact infrared temperature sensor 116 in this application achieves circumferential separation of heating and cooling functions. The heating area is located in the upper half of the roll, which effectively avoids the interference of the emulsion on the heating efficiency and ensures that electromagnetic energy is efficiently transmitted to the roll surface. The spraying area is located in the lower half of the roll, which uses gravity to assist in the drainage, thus meeting the edge lubrication and cooling requirements and preventing liquid from splashing upwards onto the first heating device 111.
[0078] As a supplement to the technical solution of this utility model, a non-contact infrared temperature sensor 116 is also included, which is set on the frame arch 101 and located on the upper side of the casting nozzle 110. The detection end of the non-contact infrared temperature sensor 116 is set facing the surface of the strip to measure the surface temperature of the strip that is about to enter the space between the casting nozzle 110 and the upper casting roll 108. The specific temperature measurement position is located on the surface of the strip 2 to 10 mm above the casting nozzle 110. The heating temperature of the electric heating coil is adjusted by adjusting the output power based on the monitored temperature.
[0079] Based on the casting-rolling composite system disclosed in this utility model, casting-rolling composite is performed, wherein the strip is a copper strip and the molten metal is an aluminum alloy molten metal, including the following steps:
[0080] S1. After melting the aluminum alloy, it is poured into a refining furnace for refining and heat preservation. During the refining process, an aluminum-titanium-boron refining agent is added to the refining furnace, and a degassing and slag removal process is performed. Then, the molten aluminum alloy is conveyed to the casting nozzle 110 through a flow channel; one pole of the power supply 400 is electrically connected to the surface of the strip to be composited, and the other pole of the power supply 400 is electrically connected to the molten aluminum alloy, thus realizing that the two poles of the power supply 400 are respectively connected to the copper strip and the molten aluminum alloy.
[0081] S2. The aluminum alloy melt is conveyed through the casting nozzle 110 to the gap between the rolls of the casting and rolling roll group. The casting and rolling roll group is started to cast and roll the aluminum alloy melt until the casting and rolling process reaches a stable state. The aluminum alloy plate surface is flat and bright, without horizontal lines, and the melt temperature, plate thickness and coiling tension are stable.
[0082] S3. The copper strip is continuously conveyed to the gap between the rolls of the casting and rolling roll group through the strip pinch rolls, so that the copper strip and the aluminum alloy melt are cast and rolled together in the roll gap to obtain a copper-aluminum composite slab. The surface temperature of the upper casting roll 108 is 85-180°C, and cooling water is circulated in the lower casting roll 109 to keep the surface temperature of the lower casting roll 109 not higher than 85°C. The diameter ratio of the upper casting roll 108 to the lower casting roll 109 is 1.1-1.4. The casting and rolling speed is 1.3-1.5 m / min, and the strip deformation is 5-10%.
[0083] When the copper strip is continuously conveyed into the gap of the casting and rolling roll group, the power supply 400 is turned on simultaneously to pass a pulse current or DC current between the copper strip and the aluminum alloy melt.
[0084] The formula for calculating the magnitude of the applied current is as follows:
[0085]
[0086] In the above formula, The thickness of the copper strip to be laminated is in mm. Width of copper-aluminum layered composite strip, unit: mm. It is a constant, ranging from 0.15 to 0.25;
[0087] When a pulse current is applied, the pulse current parameters are limited to: frequency 15-25Hz, pulse duty cycle 10-20%.
[0088] S4. The aluminum-copper composite slab obtained in step S3 is warm rolled using a warm rolling mill 200.
[0089] S5. The warm-rolled aluminum-copper composite slab is rolled up using a 300 rolling mill to obtain copper-aluminum layered composite strip.
[0090] The copper-aluminum composite strip produced by the above process has a shear strength of approximately 95 MPa.
[0091] The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be included within the protection scope of the present invention.
Claims
1. A casting-rolling composite system for casting-rolling composite of strip and molten metal, characterized in that, Includes a casting and rolling mill (100) and strip pinch rolls (500); The strip pinch roll (500) is positioned above the casting and rolling mill (100) and is used to convey the strip into the casting and rolling mill (100); The casting and rolling mill (100) includes an upper casting roll (108), a lower casting roll (109), a casting nozzle (110), a flow channel, and a first heating device (111). The upper casting roll (108) is located above the lower casting roll (109), and the diameter of the upper casting roll (108) is larger than the diameter of the lower casting roll (109). The upper casting roll (108) is a solid roll, and the lower casting roll (109) is provided with a cooling water pipe for introducing cooling water. The flow channel is connected to the casting nozzle (110), and the lip of the casting nozzle (110) extends into the roll gap area between the upper casting roll (108) and the lower casting roll (109). The first heating device (111) is located on one side of the upper casting roll (108) and is used to heat the surface of the upper casting roll (108).
2. The casting-rolling composite system according to claim 1, characterized in that, The casting nozzle (110) has a flat wedge-shaped cavity structure, including an upper lip plate (112) and a lower lip plate (113) symmetrically arranged on the upper and lower sides, forming a flat flow channel for the flow of molten metal, and the outlet of the flow channel is the lip. The front end face of the upper lip plate (112) is parallel to the surface of the upper casting roll (108) and a gap is reserved; the front end face of the lower lip plate (113) is parallel to the surface of the lower casting roll (109) and a gap is reserved; the front end extension length of the lower lip plate (113) is greater than the front end extension length of the upper lip plate (112).
3. The casting-rolling composite system according to claim 2, characterized in that, The casting and rolling mill (100) also includes a frame archway (101), a roll bearing housing (102), a hydraulic cylinder (103), and a power unit; Roll bearing seats (102) are installed at both ends of the upper casting roll (108) and the lower casting roll (109). A window (104) is provided on the frame arch (101). The roll bearing seat (102) located at the end of the upper casting roll (108) is embedded in the window (104) of the frame arch (101) and can slide up and down along the window (104). The hydraulic cylinder (103) is located at the upper end of the frame arch (101), and the piston rod of the hydraulic cylinder (103) is connected to the roll bearing seat (102) located at the end of the upper casting roll (108) to drive the upper casting roll (108) to rise and fall. The roll bearing seat (102) located at the end of the lower casting roll (109) is fixedly connected to the frame arch (101). The power unit is provided with two sets and is respectively connected to the upper casting roll (108) and the lower casting roll (109). It includes a main motor (105), a reducer (106), and a universal coupling (107). The output shaft of the main motor (105) is fixedly connected to the input shaft of the reducer (106) through the coupling. The output shaft of the reducer (106) is connected to one end of the universal coupling (107), and the other end of the universal coupling (107) is connected to the roll neck.
4. The casting-rolling composite system according to claim 3, characterized in that, The first heating device (111) includes a fixed bracket and a heating body. The heating body is set on the fixed bracket, and the end of the fixed bracket is connected to the roll bearing seat (102) so that the heating body is suspended in the upper area of the upper casting roll (108). The heating body is a flat electromagnetic induction heater or an infrared heating plate.
5. A casting-rolling composite system according to claim 3, characterized in that, The ratio of the diameter of the upper casting roll (108) to the diameter of the lower casting roll (109) is 1.1 to 1.
4.
6. The casting-rolling composite system according to claim 4, characterized in that, The casting and rolling mill (100) includes an emulsion spraying system, which includes an emulsion conveying pipeline (114) and a narrow-slit spray nozzle (115) installed on the emulsion conveying pipeline (114). The width of the upper casting roll (108) is greater than the width of the strip. The emulsion conveying pipeline (114) is located on one side of the upper casting roll (108). The spraying area of the narrow slit spray nozzle (115) corresponds to the area on the surface of the upper casting roll (108) that does not contact the strip. The narrow-slit spray nozzle (115) is located on the side of the upper casting roll (108) away from the casting nozzle (110) and below the first heating device (111).
7. A casting-rolling composite system according to claim 6, characterized in that, The casting mill (100) also includes a non-contact infrared temperature sensor (116), which is set on the frame arch (101) and located on the upper side of the casting nozzle (110). The detection end of the non-contact infrared temperature sensor (116) is set towards the surface of the strip to measure the temperature of the strip surface. The detection position of the non-contact infrared temperature sensor (116) is located on the strip surface 2 to 10 mm above the casting nozzle (110).
8. A casting-rolling composite system according to claim 7, characterized in that, It also includes a second heating device (117), which has the same structure as the first heating device (111). It is disposed on one side of the metal plate and located above the non-contact infrared temperature sensor (116) for heating the metal plate. The heating body of the first heating device (111) is 15-20 mm away from the surface of the upper casting roll (108); The heating body of the second heating device (117) is 15-20 mm away from the surface of the plate and strip.
9. A casting-rolling composite system according to claim 1, characterized in that, It also includes an electrical processing system, which includes a power supply (400), a first conductive element (402), and a second conductive element (403). The first end of the first conductive element (402) is electrically connected to the power supply (400), and the second end is electrically connected to the plate. The first end of the second conductive element (403) is connected to the power supply (400), and the second end is immersed in the molten metal in the flow channel.
10. A casting-rolling composite system according to claim 9, characterized in that, The first conductive element (402) includes a first wire and a carbon brush (401). The carbon brush (401) is disposed on one side of the strip and in contact with the surface of the strip. The first wire is connected between the power supply (400) and the carbon brush (401). The second conductive element (403) includes a second wire and a graphite electrode. The lower part of the graphite electrode is immersed in the molten metal in the flow channel, and the second wire is connected between the power supply (400) and the graphite electrode.