Aluminum alloy continuous casting and rolling electromagnetic treatment equipment and method

Abstract

The invention discloses aluminum alloy continuous casting and rolling electromagnetic treatment equipment and method, and relates to the technical field of metallurgy, the aluminum alloy continuous casting and rolling electromagnetic treatment equipment comprises a treatment tank, a heating module, a magnetic field excitation module and a supporting module, the treatment tank is used for containing aluminum alloy melt, and the heating module is located at the bottom of the treatment tank and used for heating the aluminum alloy melt in the treatment tank; the magnetic field excitation module is located on the outer wall of the treatment tank and used for exciting a pulsed magnetic field, the pulsed magnetic field penetrates through the side wall of the treatment tank and acts on the molten aluminum alloy, and the supporting module is installed at the lower end of the magnetic field excitation module and can drive the magnetic field excitation module to ascend, descend and move. According to the method, refining of the electrical aluminum casting blank can be achieved, and therefore obtained electrical aluminum is free of grain refiner segregation and high in purity.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy, and in particular to an electromagnetic treatment device and method for continuous casting and rolling of aluminum alloy. Background Art

[0002] Electrical aluminum has the advantages of light weight, good conductivity, small sag and strong resistance to external overload, and is widely used in high-voltage transmission lines. At present, electrical aluminum is often produced by continuous casting and rolling. However, casting defects such as inclusions, shrinkage holes, and coarse grains in the ingots can easily lead to problems such as broken rods and ingots in the subsequent rolling process. At the same time, the mechanical and electrical properties of the produced electrical aluminum are poor. Therefore, the quality of electrical aluminum ingots has a great influence on the performance of electrical aluminum. Refining the solidification structure of electrical aluminum ingots can effectively reduce casting defects in ingots.

[0003] The existing production process of electrical aluminum (such as A4 electrical aluminum) is to refine the solidification structure of the ingot by adding grain refiners to the aluminum alloy melt. However, the grain refiners are prone to segregation in the aluminum alloy melt, which in turn causes defects such as inclusions and deteriorates the mechanical and electrical properties of the electrical aluminum. Summary of the invention

[0004] The purpose of the present invention is to provide an electromagnetic treatment equipment and method for continuous casting and rolling of aluminum alloys to solve the problems existing in the above-mentioned prior art, realize the refinement of electrical aluminum ingots, and further make the obtained electrical aluminum free of grain refiner segregation and high in purity.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides an electromagnetic treatment equipment for aluminum alloy continuous casting and rolling, comprising a treatment tank, a heating module, a magnetic field excitation module and a supporting module. The treatment tank is used to hold aluminum alloy melt, the heating module is located at the bottom of the treatment tank, and the heating module is used to heat the aluminum alloy melt in the treatment tank, the magnetic field excitation module is located on the outer wall of the treatment tank, and the magnetic field excitation module is used to excite a pulse magnetic field, and make the pulse magnetic field penetrate the side wall of the treatment tank and act on the aluminum alloy melt, the supporting module is installed at the lower end of the magnetic field excitation module, and the supporting module can drive the magnetic field excitation module to rise, fall and move.

[0007] In one embodiment, the processing tank is a chute, and the diameter of the chute gradually decreases from top to bottom.

[0008] In one embodiment, the heating module is located on the inner bottom surface of the chute, and a bottom plate is provided at the upper end of the heating module, and the outer wall of the bottom plate is in contact with the inner wall of the chute; the bottom plate and the side wall of the chute are both made of refractory materials.

[0009] In one embodiment, the heating module is an electromagnetic induction coil, which can generate uniform heat and transfer it to the aluminum alloy melt in the processing tank when an alternating current is input into the electromagnetic induction coil.

[0010] In one embodiment, the electromagnetic induction coil is wound by a copper tube, and a cooling channel is provided inside the electromagnetic induction coil, and the cooling channel is used to pass cooling air.

[0011] In one embodiment, the magnetic field excitation module includes two groups of pulsed magnetic field excitation coils, and the two groups of pulsed magnetic field excitation coils are symmetrically arranged along the axis of the processing tank, each group of the pulsed magnetic field excitation coils is provided with an external wiring on the side away from the processing tank, and the outer periphery of each group of the pulsed magnetic field excitation coils is provided with a heat insulation cover, and the lower end of each of the heat insulation covers is respectively connected to one of the support modules.

[0012] In one embodiment, the support module includes a mobile platform, walking wheels and a lifting rod, the walking wheels are installed at the lower end of the mobile platform, and brake pads are provided on the walking wheels, the lifting rod is installed at the upper end of the mobile platform, and the upper end of the lifting rod is connected to the heat insulation cover, and can drive the heat insulation cover and the pulse magnetic field excitation coil to rise and fall, the two mobile platforms are connected by a connecting head between the sides close to each other, and the connecting head can adjust the distance between the two mobile platforms.

[0013] In one embodiment, the connecting head includes a hook and a long slot plate, one end of the long slot plate is fixed to one side of one of the mobile platforms, and the hook is fixed to one side of the other mobile platform. By hooking the hook at different positions of the long slot plate, the distance between the two mobile platforms can be adjusted.

[0014] The present invention also provides an electromagnetic treatment method for aluminum alloy continuous casting and rolling, using the aluminum alloy continuous casting and rolling electromagnetic treatment equipment described in any one of the above technical solutions, comprising the following steps:

[0015] S1. An electromagnetic induction coil is installed on the inner bottom surface of the processing tank to form a heating module, and a pulse magnetic field excitation coil is placed on the outer wall of the processing tank to form a magnetic field excitation module;

[0016] S2. Connecting multiple electromagnetic induction coils at different positions on the bottom of the processing tank to alternating current in sequence, and selecting whether to turn on heating according to the temperature of the aluminum alloy melt in the processing tank;

[0017] S3. Cooling air is passed to the inside of the electromagnetic induction coil on the bottom of the processing tank to cool the side walls of the processing tank and the aluminum alloy melt in the processing tank, and the air volume of the cooling air is controlled according to the action time of the alternating electromagnetic field and the temperature of the aluminum alloy melt in the processing tank;

[0018] S4. Connect the pulse magnetic field excitation coil to the control cabinet and the dedicated pulse power supply. When the alternating current is input into the pulse magnetic field excitation coil, the pulse magnetic field excitation coil instantaneously excites the pulse magnetic field, and allows the pulse magnetic field to penetrate the side wall of the processing tank to act on the aluminum alloy melt in the processing tank. At the same time, the pulse magnetic field control parameters can be matched with the corresponding parameter process according to the continuous casting and rolling speed, and the treated aluminum alloy melt enters the subsequent continuous casting and rolling process.

[0019] In one embodiment, the pulsed magnetic field control parameters in S4 include:

[0020] The alternating current uses a rectangular wave pulse current, the rectangular wave pulse current is 100A-600A, the pulse width of the rectangular wave pulse current is less than 50%, the magnetic field frequency generated by the pulse magnetic field excitation coil is 10Hz-50Hz, and the magnetic induction intensity is 100mT-500mT.

[0021] Compared with the prior art, the present invention has achieved the following technical effects:

[0022] The electromagnetic treatment equipment and method for aluminum alloy continuous casting and rolling provided by the present invention are as follows: the treatment tank is used to hold aluminum alloy melt; the heating module is located at the bottom of the treatment tank, and the heating module is used to heat the aluminum alloy melt in the treatment tank; when an alternating current is input to the heating module, uniform heat is quickly generated inside the heating module and transferred to the aluminum alloy melt in the treatment tank, so as to prevent the aluminum alloy melt from cooling during the flow process and reduce energy consumption; the magnetic field excitation module is located on the outer wall of the treatment tank, and the magnetic field excitation module is used to excite a pulse magnetic field, and the pulse magnetic field penetrates the side wall of the treatment tank and acts on the aluminum alloy melt; when an alternating current is input to the magnetic field excitation module, a high-energy pulse magnetic field can be instantly excited. After being treated by a high-energy pulse magnetic field, the aluminum alloy melt can change the aggregation and disturbance of atoms and atomic clusters in the aluminum alloy melt, refine the grains, reduce the use of modifiers and refiners, optimize the alloy component segregation problem, and improve the mechanical properties requirements of castings and products, especially for the continuous casting and rolling process of high-purity aluminum. The support module is installed at the lower end of the magnetic field excitation module, and the support module can drive the magnetic field excitation module to rise and fall and move, and then control the action of the support module according to the width, height and other conditions of the processing tank, so as to drive the movement of the magnetic field excitation module in the height direction and the width direction to meet the placement position requirements, and then can adapt to the use of processing tanks of various sizes to expand the scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a schematic structural diagram of the electromagnetic treatment equipment for aluminum alloy continuous casting and rolling in Example 1;

[0025] Figure 2 The left figure is a low-magnification structure diagram of A4 electrical aluminum after being treated with controllable electromagnetic energy in the specific embodiment 1, and the right figure is a low-magnification structure diagram of A4 electrical aluminum without being treated with controllable electromagnetic energy;

[0026] Figure 3 The left figure is a low-magnification structure diagram of 1A60 electrical aluminum obtained by controlled electromagnetic energy treatment in the second specific embodiment, and the right figure is a low-magnification structure diagram of 1A60 electrical aluminum obtained without controlled electromagnetic energy treatment;

[0027] Figure 4 The left figure is a low-magnification structure diagram of 8176 electrical aluminum obtained by controlled electromagnetic energy treatment in specific embodiment 3, and the right figure is a low-magnification structure diagram of 8176 electrical aluminum obtained without controlled electromagnetic energy treatment;

[0028] In the figure: 1-aluminum alloy melt, 2-processing tank, 3-bottom plate, 4-moving platform, 5-pulse magnetic field excitation coil, 6-heat shield, 7-external wiring, 8-electromagnetic induction coil, 9-lifting rod, 10-travel wheel. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The purpose of the present invention is to provide an aluminum alloy continuous casting and rolling electromagnetic treatment equipment and method to solve the problems existing in the prior art, realize the refinement of electrical aluminum ingots, and further make the obtained electrical aluminum free of grain refiner segregation and high in purity.

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Embodiment 1

[0033] like Figure 1 As shown, the present embodiment provides an electromagnetic processing equipment for continuous casting and rolling of aluminum alloys, including a processing tank 2, a heating module, a magnetic field excitation module and a supporting module. The processing tank 2 is used to hold aluminum alloy melt 1, the heating module is located at the bottom of the processing tank 2, and the heating module is used to heat the aluminum alloy melt 1 in the processing tank 2, and then when an alternating current is input to the heating module, uniform heat is quickly generated inside the heating module and transferred to the aluminum alloy melt 1 in the processing tank 2, so as to prevent the aluminum alloy melt 1 from cooling during the flow process and reduce energy consumption. The magnetic field excitation module is located on the outer wall of the processing tank 2, and the magnetic field excitation module is used to excite a pulse magnetic field, and the pulse magnetic field penetrates the side wall of the processing tank 2 and acts on the aluminum alloy melt 1, and then when an alternating current is input to the magnetic field excitation module, the magnetic field excitation module is used to excite a pulse magnetic field. When the flow is in the process of high-energy pulse magnetic field, the high-energy pulse magnetic field can be instantly excited. After the aluminum alloy melt 1 is treated by the high-energy pulse magnetic field, the atoms and atomic clusters of the aluminum alloy melt 1 can be changed to aggregate and disturb, refine the grains, reduce the amount of modifiers and refiners used, optimize the alloy component segregation problem, improve the mechanical properties of castings and products, and have a significant effect on the continuous casting and rolling process of high-purity aluminum. The support module is installed at the lower end of the magnetic field excitation module, and the support module can drive the magnetic field excitation module to rise and fall and move, and then control the action of the support module according to the width, height and other conditions of the processing tank 2 to drive the movement of the magnetic field excitation module in the height direction and the width direction to meet the placement position requirements, and then can adapt to the use of processing tanks 2 of various sizes, expanding the scope of application. Through the above design, the refinement of the electrical aluminum ingot can be achieved without the use of a grain refiner, and the resulting electrical aluminum has a high purity due to the absence of a grain refiner and no grain refiner segregation.

[0034] Specifically, the processing tank 2 is a chute, and the diameter of the chute gradually decreases from top to bottom.

[0035] The heating module is located on the inner bottom surface of the chute, and a bottom plate 3 is provided at the upper end of the heating module, and the outer side wall of the bottom plate 3 contacts the inner side wall of the chute.

[0036] The bottom plate 3 and the side walls of the chute are both made of refractory materials, and the bottom plate 3 is a thin plate cast from the refractory material.

[0037] The heating module is an electromagnetic induction coil 8 , which can generate uniform heat and transfer it to the aluminum alloy melt 1 in the processing tank 2 when an alternating current is input.

[0038] The electromagnetic induction coil 8 is wound by a copper tube, and a cooling channel is provided inside the electromagnetic induction coil 8, and cooling air is introduced into the cooling channel to achieve cooling. Each electromagnetic induction coil 8 is an elliptical coil wound by a hollow copper tube, and the elliptical coil is divided into two layers, each layer has eight turns, and the inner diameter of the copper tube is 10 mm and the wall thickness is 2 mm.

[0039] The magnetic field excitation module includes two groups of pulse magnetic field excitation coils 5, which are low-intensity pulse magnetic field excitation coils, and the two groups of pulse magnetic field excitation coils 5 are symmetrically arranged along the axis of the processing tank 2. Each group of pulse magnetic field excitation coils 5 is provided with an external wiring 7 on the side away from the processing tank 2, and the outer periphery of each group of pulse magnetic field excitation coils 5 is provided with a heat insulation cover 6, which can play a heat insulation role, and the lower end of each heat insulation cover 6 is respectively connected to a support module.

[0040] The supporting module includes a mobile platform 4, a walking wheel 10 and a lifting rod 9. The walking wheel 10 is installed at the lower end of the mobile platform 4, and a brake pad is provided on the walking wheel 10. The lifting rod 9 is installed at the upper end of the mobile platform 4, and the lifting rod 9 can be driven by a hydraulic cylinder, etc. The upper end of the lifting rod 9 is connected to the heat insulation cover 6, and can drive the heat insulation cover 6 and the pulse magnetic field excitation coil 5 to rise and fall. The two mobile platforms 4 are connected by a connector between the sides close to each other, and the connector can adjust the distance between the two mobile platforms 4.

[0041] The connecting head includes a hook and a long groove plate, one end of the long groove plate is fixed to one side of one of the mobile platforms 4, and the hook is fixed to one side of the other mobile platform 4. By hooking the hook at different positions of the long groove plate, the distance between the two mobile platforms 4 can be adjusted, and the position can be fixed after the distance adjustment, thereby being able to adapt to processing tanks 2 of different sizes.

[0042] Embodiment 2

[0043] This embodiment provides an electromagnetic treatment method for aluminum alloy continuous casting and rolling, using the aluminum alloy continuous casting and rolling electromagnetic treatment equipment in embodiment 1, including the following steps:

[0044] S1. An electromagnetic induction coil 8 is installed on the inner bottom surface of the processing tank 2 to form a heating module. The two ends of the processing tank 2 are butt-connected. There may be gaps at the connection. Then, asbestos mesh pads are used to clamp the connection to prevent the aluminum alloy melt 1 from flowing out. A pulse magnetic field excitation coil 5 is placed on the outer wall of the processing tank 2 to form a magnetic field excitation module. The distance between the pulse magnetic field excitation coil 5 and the aluminum alloy melt 1 is preferably 5 mm to 70 mm, and more preferably 10 mm to 60 mm.

[0045] S2. Connecting multiple electromagnetic induction coils 8 at different positions on the bottom surface of the processing tank 2 to an alternating current in sequence, and selecting whether to turn on heating according to the temperature of the aluminum alloy melt 1 in the processing tank 2; selecting a rectangular wave pulse current, wherein the peak value of the rectangular wave pulse current is less than 600A, the pulse width of the rectangular wave pulse current is less than 50%, the magnetic field frequency is less than 50Hz, and the magnetic field strength is less than 300mT;

[0046] S3. Cooling air is passed into the electromagnetic induction coil 8 on the bottom surface of the processing tank 2 to cool the side wall of the processing tank 2 and the aluminum alloy melt 1 in the processing tank 2. The air volume of the cooling air is controlled according to the action time of the alternating electromagnetic field and the temperature of the aluminum alloy melt 1 in the processing tank 2. When air cooling is performed, a strong fan can be used to blow air through one side of the copper tube for cooling;

[0047] S4. Connect the pulse magnetic field excitation coil 5 to the control cabinet and the dedicated pulse power supply. When an alternating current is input to the pulse magnetic field excitation coil 5, the pulse magnetic field excitation coil 5 instantaneously excites the pulse magnetic field, and allows the pulse magnetic field to penetrate the side wall of the processing tank 2 to act on the aluminum alloy melt 1 in the processing tank 2. At the same time, the pulse magnetic field control parameters can be matched with the corresponding parameter process according to the continuous casting and rolling speed. The treated aluminum alloy melt 1 enters the subsequent continuous casting and rolling process, thereby achieving heat preservation during the flow of the aluminum alloy melt 1 in the processing tank 2, reducing production energy consumption, refining grains, reducing the use of modifiers and refiners, optimizing alloy component segregation, and improving the mechanical properties of castings and products. Among them, the magnetic induction intensity is 100mT~500mT, the rectangular wave pulse current is 100A~600A, the magnetic field frequency is 10Hz~50Hz, and the rectangular wave pulse current pulse width is less than 50%.

[0048] Before using the above-mentioned treatment method to perform controllable electromagnetic energy treatment on the aluminum alloy melt 1, the aluminum alloy melt 1 needs to be subjected to the steps of refining, standing, degassing and filtering in sequence.

[0049] Among them, refining is preferably adding refining agent and slag-forming agent to the aluminum alloy melt 1 and stirring. The refining temperature is preferably 780℃~790℃. The present embodiment has no special limitation on the refining agent and slag-forming agent, and the refining agent and slag-forming agent well known to those skilled in the art can be used; the static insulation temperature is preferably 760℃~770℃, and the time is preferably 35min~45min; the degassing and filtration temperatures are independently preferably 720℃~750℃, more preferably 730℃~750℃. The present embodiment has no special limitation on the degassing and filtration operations, and the degassing and filtration operations well known to those skilled in the art can be used. By degassing and filtration, the gas and large particle impurities in the aluminum alloy melt 1 can be removed.

[0050] After the aluminum alloy melt 1 is subjected to controllable electromagnetic energy treatment using the above-mentioned treatment method, continuous casting and rolling processes are carried out to obtain electrical aluminum. The continuous casting and rolling processes are to crystallize the aluminum alloy melt 1 after the controllable electromagnetic energy treatment (the crystallization preferably includes introducing the aluminum alloy melt 1 after the controllable electromagnetic energy treatment into a crystallization device through a treatment tank 2 for continuous casting), and the obtained ingot is rolled. In this embodiment, there is no special limitation on the chemical composition of the electrical aluminum, and the chemical composition of the electrical aluminum familiar to those skilled in the art can be used.

[0051] In this embodiment, according to the flow direction of the aluminum alloy melt 1, the processing tank 2 preferably includes a first chute and a second chute, the first chute is a main chute, the temperature of the melt when it flows into the first chute is preferably 700°C to 720°C, more preferably 702°C to 708°C, and the temperature of the melt when it flows into the second chute is preferably 700°C; the crystallization device is preferably a crystallization wheel, and the speed of the driving motor of the crystallization wheel is preferably 200rpm to 1925rpm, more preferably 250rpm to 1500rpm, and the crystallization wheel is preferably 1000rpm. The material is preferably red copper, the cooling medium in the crystallization wheel is water, and the water temperature is preferably 30°C; in this embodiment, the ingot obtained by continuous casting is passed through the straightening rollers of the continuous casting machine and enters the rolling mill for rolling, and the starting rolling temperature is preferably 500°C to 560°C, and more preferably 520°C to 560°C; the rolling speed is preferably 1.2m / s to 12.3m / s, and more preferably 1.5m / s to 12m / s; the diameter of the electrical aluminum is preferably 7.5mm to 24mm, and more preferably 8mm to 22mm.

[0052] In this embodiment, raw materials that meet the chemical composition of electrical aluminum are preferably mixed and then smelted. In this embodiment, the smelting temperature is preferably 800°C to 850°C, and more preferably 810°C to 840°C. This embodiment has no special requirements on the source and type of raw materials for electrical aluminum, and raw materials familiar to those skilled in the art can be used. This embodiment has no special requirements on smelting equipment, and equipment familiar to those skilled in the art can be used, such as a natural gas reverberatory furnace.

[0053] For parameter requirements:

[0054] The temperature of the aluminum alloy melt 1 is 750°C to 770°C, more preferably 755°C to 765°C; the temperature of the controllable electromagnetic energy treatment is 710°C to 720°C, more preferably 712°C to 718°C; the magnetic induction intensity is 100mT to 500mT, more preferably 100mT to 150mT; the pulse current is 100A to 300A, more preferably 100A to 150A; the pulse frequency is 10Hz to 50Hz, more preferably 20Hz~50Hz; duty cycle is 0.1~0.6, more preferably 0.15~0.5; time is 30s~60s, more preferably 40s~50s; the waveform of the magnetic field excitation current in the controllable electromagnetic energy treatment is a rectangular wave; the starting rolling temperature is 500℃~560℃; the rolling speed is 1.2m / s~12.3m / s; the diameter of the electrical aluminum is 7.5mm~24mm.

[0055] Moreover, after the aluminum alloy melt 1 of electrical aluminum is treated with controllable electromagnetic energy, the number of clusters of short-range ordered structures in the aluminum alloy melt 1 increases, and these clusters gradually grow in the subsequent melt flow process, so that the number of clusters with a size close to the critical nucleus in the melt increases; in the subsequent crystallization and solidification stage of continuous casting and rolling, these clusters will be preferentially transformed into nuclei, thereby increasing the nucleation rate. The increase in the nucleation rate can refine the solidification structure of the ingot, so that this embodiment can achieve electrical aluminum grain refinement without using grain refiners, while reducing casting defects; after grain refinement, the strength and plasticity of the ingots obtained in continuous casting and rolling are significantly improved, and production accidents such as ingot breakage and rod breakage are less likely to occur during the continuous rolling process; at the same time, due to the fine grain strengthening effect, the mechanical properties of the electrical aluminum are significantly improved; in addition, since no grain refiner is used, the purity of the electrical aluminum obtained by the preparation method of this embodiment is improved, avoiding the adverse effects of foreign elements on the resistivity of the electrical aluminum, and improving the electrical properties of the obtained electrical aluminum.

[0056] The test results of the embodiment show that the electrical aluminum structure obtained by the preparation method provided in this embodiment has fine grains; the tensile strength of the electrical aluminum is 102MPa-106MPa, the elongation is 14%-17%, and the strength and plasticity are excellent; the resistivity is 27.91Ω·mm at 25°C 2 / mm~28.03Ω·mm 2 / mm, good electrical conductivity. Specific embodiment 1

[0058] In this embodiment, the alloy raw material that meets the chemical composition of A4 electrical aluminum is heated and melted in a smelting furnace, refined, and taken out of the furnace after standing. The obtained molten metal is degassed and filtered, and the obtained molten metal is placed 60 mm away from the magnetic pole, and a rectangular wave magnetic field excitation current is used to perform controllable electromagnetic energy treatment for 30 seconds under the conditions of a temperature of 710°C, a magnetic induction intensity of 125mT, a pulse current of 120A, a pulse frequency of 20Hz, and a duty cycle of 0.2. The molten metal is then introduced into the second launder through the first launder, and then introduced into the crystallization wheel with a driving motor speed of 1254rpm through the second launder. The ingot is crystallized and solidified to obtain the ingot, and the ingot is passed through the straightening rollers of the continuous casting machine into a rolling mill with a starting rolling temperature of 540°C and a rolling speed of 7.7m / s to obtain electrical aluminum with a diameter of 9.5mm. Specific embodiment 2

[0060] In this embodiment, the alloy raw material that meets the chemical composition of 1A60 electrical aluminum is heated and melted in a smelting furnace, refined, and taken out of the furnace after standing. The obtained molten metal is degassed and filtered, and the obtained molten metal is placed 10 mm away from the magnetic pole, and a rectangular wave magnetic field excitation current is used to perform controllable electromagnetic energy treatment for 30 seconds under the conditions of a temperature of 720°C, a magnetic induction intensity of 170mT, a pulse current of 165A, a pulse frequency of 30Hz, and a duty cycle of 0.3. The molten metal is then introduced into the second launder through the first launder, and then introduced into the crystallization wheel with a driving motor speed of 1260rpm through the second launder. The ingot is crystallized and solidified to obtain the ingot, and the ingot is passed through the straightening rollers of the continuous casting machine into a rolling mill with a starting rolling temperature of 560°C and a rolling speed of 7.8m / s to obtain electrical aluminum with a diameter of 9.5mm. Specific embodiment three

[0062] In this embodiment, the alloy raw material that meets the chemical composition of 8176 electrical aluminum is heated and melted in a smelting furnace, refined, and then taken out of the furnace after standing. The obtained molten metal is degassed and filtered, and the obtained molten metal is placed 60 mm away from the magnetic pole, and a rectangular wave magnetic field excitation current is used to perform controllable electromagnetic energy treatment for 30 seconds under the conditions of a temperature of 710°C, a magnetic induction intensity of 240mT, a pulse current of 275A, a pulse frequency of 40Hz, and a duty cycle of 0.4. The molten metal is then introduced into the second launder through the first launder, and then introduced into the crystallization wheel with a driving motor speed of 1254rpm through the second launder. The ingot is crystallized and solidified to obtain the ingot, and the ingot is passed through the straightening rollers of the continuous casting machine into a rolling mill with a starting rolling temperature of 560°C and a rolling speed of 7.7m / s to obtain electrical aluminum with a diameter of 9.5mm.

[0063] Comparative Example 1

[0064] Compared with the technical solution in the specific embodiment 1, this embodiment does not perform controllable electromagnetic energy treatment, and the remaining technical means are consistent with the technical means in the specific embodiment 1, thereby obtaining electrical aluminum.

[0065] The ingots obtained in Specific Example 1, Specific Example 2, Specific Example 3 and Comparative Example 1 were respectively subjected to acid etching (the composition of the etching solution was HF: HCl: H2O = 10: 15: 90, and the etching time was 30 min), and then a low-power structure observation test was performed. The obtained low-power structure diagram is shown in FIG. Figures 2 to 4 ,in, Figure 2 The left figure in the middle is a low-magnification structure diagram of A4 electrical aluminum obtained by controlled electromagnetic energy treatment in the specific embodiment 1, and the right figure is a low-magnification structure diagram of A4 electrical aluminum obtained without controlled electromagnetic energy treatment; Figure 3 The left picture in the middle is a low-magnification microstructure of 1A60 electrical aluminum obtained by controlled electromagnetic energy treatment in the specific embodiment 2, and the right picture is a low-magnification microstructure of 1A60 electrical aluminum obtained without controlled electromagnetic energy treatment; Figure 4 The left picture in the middle is a low-magnification microstructure of 8176 electrical aluminum obtained by controlled electromagnetic energy treatment in specific embodiment 3, and the right picture is a low-magnification microstructure of 8176 electrical aluminum obtained without controlled electromagnetic energy treatment. Figures 2 to 4 It can be seen that the aluminum alloy melt 1 treated by the aluminum alloy continuous casting and rolling electromagnetic treatment equipment in Example 1 according to the aluminum alloy continuous casting and rolling electromagnetic treatment method in Example 2 can effectively refine the microstructure grains of electrical aluminum.

[0066] According to GBT 16865-2013 Specimens and methods for tensile testing of deformed aluminum, magnesium and their alloy products, a universal tensile machine was used to test the mechanical properties of the electrical aluminum obtained in Specific Example 1, Specific Example 2, Specific Example 3 and Comparative Example 1; according to GB / T 3048.2 Electrical performance test methods for wires and cables Part 2: Resistivity test of metallic materials, a Keysight 34420A microohmmeter was used to test the resistivity of the electrical aluminum obtained in Specific Example 1, Specific Example 2, Specific Example 3 and Comparative Example 1. The test results are shown in Table 1.

[0067] Table 1 Test results of electrical aluminum obtained in specific examples 1 to 3 and comparative example 1

[0068] Tensile strength(MPa) Elongation(%) <![CDATA[Resistivity at 25°C (Ω·mm 2 / mm)]]> Specific embodiment 1 105 17 28.02 Specific embodiment 2 102 16 28.03 Specific embodiment three 106 17 27.91 Comparative Example 1 97 15 28.12

[0069] As can be seen from Table 1, the electrical aluminum obtained by treating the aluminum alloy melt 1 by the aluminum alloy continuous casting and rolling electromagnetic treatment equipment in Example 1 according to the aluminum alloy continuous casting and rolling electromagnetic treatment method in Example 2 has a tensile strength of 102MPa-106MPa, an elongation of 14%-17%, and excellent strength and plasticity; the resistivity at 25°C is 27.91Ω·mm 2 / mm~28.03Ω·mm 2 / mm, good conductivity.

[0070] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An electromagnetic treatment equipment for aluminum alloy continuous casting and rolling, characterized in that: It includes a processing tank, a heating module, a magnetic field excitation module and a supporting module. The processing tank is used to hold aluminum alloy melt. The heating module is located at the bottom of the processing tank and is used to heat the aluminum alloy melt in the processing tank. The magnetic field excitation module is located on the outer wall of the processing tank and is used to excite a pulse magnetic field, and make the pulse magnetic field penetrate the side wall of the processing tank and act on the aluminum alloy melt. The supporting module is installed at the lower end of the magnetic field excitation module, and the supporting module can drive the magnetic field excitation module to rise, fall and move.

2. The electromagnetic treatment equipment for aluminum alloy continuous casting and rolling according to claim 1, characterized in that: The processing tank is a chute, and the diameter of the chute gradually decreases from top to bottom.

3. The electromagnetic treatment equipment for aluminum alloy continuous casting and rolling according to claim 2, characterized in that: The heating module is located on the inner bottom surface of the chute, and a bottom plate is provided at the upper end of the heating module, and the outer side wall of the bottom plate contacts the inner side wall of the chute; the bottom plate and the side wall of the chute are both made of refractory materials.

4. The electromagnetic treatment equipment for aluminum alloy continuous casting and rolling according to claim 1, characterized in that: The heating module is an electromagnetic induction coil, which can generate uniform heat and transfer it to the aluminum alloy melt in the processing tank when an alternating current is input into the electromagnetic induction coil.

5. The electromagnetic treatment equipment for aluminum alloy continuous casting and rolling according to claim 4, characterized in that: The electromagnetic induction coil is wound by a copper tube, and a cooling channel is arranged inside the electromagnetic induction coil, and the cooling channel is used for passing cooling air.

6. The electromagnetic treatment equipment for aluminum alloy continuous casting and rolling according to claim 1, characterized in that: The magnetic field excitation module includes two groups of pulse magnetic field excitation coils, and the two groups of pulse magnetic field excitation coils are symmetrically arranged along the axis of the processing tank, each group of the pulse magnetic field excitation coils is provided with an external wiring on the side away from the processing tank, and the outer periphery of each group of the pulse magnetic field excitation coils is provided with a heat insulation cover, and the lower end of each heat insulation cover is respectively connected to one of the support modules.

7. The electromagnetic treatment equipment for aluminum alloy continuous casting and rolling according to claim 6, characterized in that: The support module includes a mobile platform, walking wheels and a lifting rod, wherein the walking wheels are installed at the lower end of the mobile platform and are provided with brake pads, the lifting rod is installed at the upper end of the mobile platform, and the upper end of the lifting rod is connected to the heat insulation cover and can drive the heat insulation cover and the pulse magnetic field excitation coil to rise and fall, and the two mobile platforms are connected by a connector between the sides close to each other, and the connector can adjust the distance between the two mobile platforms.

8. The electromagnetic treatment equipment for aluminum alloy continuous casting and rolling according to claim 7, characterized in that: The connecting head includes a hook and a long groove plate, one end of the long groove plate is fixed to one side of one of the mobile platforms, and the hook is fixed to one side of the other mobile platform. By hooking the hook at different positions of the long groove plate, the distance between the two mobile platforms can be adjusted.

9. An electromagnetic treatment method for aluminum alloy continuous casting and rolling, characterized in that: The aluminum alloy continuous casting and rolling electromagnetic treatment equipment according to any one of claims 1 to 8 comprises the following steps: S1. An electromagnetic induction coil is installed on the inner bottom surface of the processing tank to form a heating module, and a pulse magnetic field excitation coil is placed on the outer wall of the processing tank to form a magnetic field excitation module; S2. Connecting multiple electromagnetic induction coils at different positions on the bottom of the processing tank to alternating current in sequence, and selecting whether to turn on heating according to the temperature of the aluminum alloy melt in the processing tank; S3. Cooling air is passed to the inside of the electromagnetic induction coil on the bottom of the processing tank to cool the side walls of the processing tank and the aluminum alloy melt in the processing tank, and the air volume of the cooling air is controlled according to the action time of the alternating electromagnetic field and the temperature of the aluminum alloy melt in the processing tank; S4. Connect the pulse magnetic field excitation coil to the control cabinet and the dedicated pulse power supply. When the alternating current is input into the pulse magnetic field excitation coil, the pulse magnetic field excitation coil instantaneously excites the pulse magnetic field, and allows the pulse magnetic field to penetrate the side wall of the processing tank to act on the aluminum alloy melt in the processing tank. At the same time, the pulse magnetic field control parameters can be matched with the corresponding parameter process according to the continuous casting and rolling speed, and the treated aluminum alloy melt enters the subsequent continuous casting and rolling process.

10. The electromagnetic treatment method for aluminum alloy continuous casting and rolling according to claim 9, characterized in that: The pulsed magnetic field control parameters in S4 include: The alternating current uses a rectangular wave pulse current, the rectangular wave pulse current is 100A-600A, the pulse width of the rectangular wave pulse current is less than 50%, the magnetic field frequency generated by the pulse magnetic field excitation coil is 10Hz-50Hz, and the magnetic induction intensity is 100mT-500mT.

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