CN111842821A - Electromagnetic treatment method for melt cast by aluminum alloy flow table - Google Patents
Electromagnetic treatment method for melt cast by aluminum alloy flow table Download PDFInfo
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- CN111842821A CN111842821A CN202010747454.0A CN202010747454A CN111842821A CN 111842821 A CN111842821 A CN 111842821A CN 202010747454 A CN202010747454 A CN 202010747454A CN 111842821 A CN111842821 A CN 111842821A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
Abstract
The invention belongs to the field of aluminum and aluminum alloy casting, and particularly relates to a melt electromagnetic treatment method for aluminum alloy runner plate casting, which is used for solving the problems that an external physical field is difficult to apply and the grain refining effect is limited in the existing aluminum alloy runner plate casting process, and simultaneously avoiding the modification of a casting runner plate structure and an original casting tool thereof. The magnetic field applying devices are respectively arranged around the runner, on the periphery of the tundish and on the upper plane of the casting flow table in the casting process of the aluminum alloy flow table, and different forms of magnetic fields can be applied to treat the metal melt in different stages in the process that the metal melt flows through the runner, the tundish and the flow table, so that the flowing and stirring of the metal melt are controlled, the temperature and the component distribution of the melt are uniform, the microstructure of the melt is changed, and the like. The method can ensure sufficient melt time, can realize different treatment effects and avoid changing the structure of the crystallizer, and is a high-efficiency melt treatment method with simple structure, convenient operation, easy control, easy disassembly and assembly and low cost.
Description
Technical Field
The invention belongs to the field of aluminum and aluminum alloy casting, and particularly relates to a melt electromagnetic treatment method for aluminum alloy flow table casting.
Background
According to the Hall-Petch relation, the strength of the polycrystalline material can be improved by refining the crystal grains; for cast alloys, coarse grains and non-uniform structure can significantly impair the mechanical, deformation and service performance of the material. Therefore, it has been a goal of those skilled in the art of alloy casting to maximize the refinement of the cast alloy structure.
At present, the method for refining the structure in the casting process mainly comprises melt refining modification treatment, casting process control (such as casting speed reduction, cooling speed increase, casting temperature reduction and the like), and mechanical vibration, ultrasonic vibration, electromagnetic stirring and the like in the casting process. But the effects of melt modification treatment and casting process refinement control are limited, and the requirements of the manufacturing field on high-quality alloy ingots cannot be met at present. Research shows that when an electromagnetic field, an ultrasonic field, a combined external field and the like are applied in the solidification process of metal and alloy, uniform solidification structures can be obviously refined, and pollution to molten metal is avoided; therefore, the application of ultrasound and electromagnetic fields during the casting and solidification of the alloy becomes an effective method for further refining the cast structure. Research shows that the forced vibration of atoms in the metal melt causes the instantaneous reduction of resistance, the ultrasonic treatment promotes the improvement of the uniformity of the short-range ordered structure in the metal melt, and the change of the structure has timeliness; the ultrasonic wave can promote solid-phase melting in a solid-liquid interface to be converted into a liquid phase, and the microstructure change is characterized by the reduction of the resistance of the metal melt in the continuous heating process; in the continuous heating process, the effect of ultrasonic treatment on the completely liquid melt is more obvious along with the increase of the temperature. In addition, the electromagnetic field can also change the microstructure of the melt; research shows that the alternating-current magnetic field can destroy the short-range order in the Sn-Pb alloy melt, promote partial expansion state electrons to be converted into local state electrons, increase the resistance of the melt, and further represent the structural change of the metal melt caused by electromagnetic field treatment by thermoelectric force and resistance change; the research result also shows that the alternating-current magnetic field treatment promotes the atom clusters in the Al-Fe melt to adsorb surrounding atoms or atom clusters to be recombined and enlarged in size, and the atom clusters are remained in the melt after the magnetic field is closed to form new core particles, so that the structure is refined. In summary, it is theoretically possible to treat the metal melt by applying an external physical field during the casting solidification process to change the alloy structure.
For the casting of the aluminum alloy ingot blank by the flow plate, because the casting efficiency is high and the speed is high, enough time is needed when the melt is applied by ultrasonic treatment, and the casting process with higher speed of continuous casting cannot be met; in addition, the space occupied by the casting flow table is large, the structure is complex, and the structure and the casting method cannot meet the requirement that a coil cooling device is arranged in enough space in each crystallizer when the excitation coil is applied. There are few reports on patents and researches related to a melt processing method and apparatus for applying an external field in a casting process of an aluminum alloy ingot blank flow plate.
Disclosure of Invention
The invention aims to provide an effective melt processing method, which is used for solving the problems that an external physical field is difficult to apply and the grain refining effect is limited in the casting process of the conventional aluminum alloy flow table, and simultaneously avoiding the modification of the casting flow table structure and the original casting tool thereof. The invention provides an innovative method for treating metal melt by respectively applying magnetic fields at different stages in the semi-continuous casting process of an aluminum alloy ingot blank, which can ensure sufficient melt treatment time, can realize different treatment effects and avoid changing the structure of a casting tool, and is a high-efficiency melt treatment method with simple structure, convenient operation, easy control, disassembly and assembly and low cost.
In order to achieve the purpose, the electromagnetic treatment method of the melt for casting the aluminum alloy flow table comprises the following steps:
in the flow disc type casting process of aluminum alloy ingot blanks, a metal melt is melted from a melting furnace to a crystallizer to be solidified into ingots, and the three stages are respectively a flow channel, a tundish and a casting flow disc. The runner is mainly used for connecting a smelting furnace, a tundish and a casting runner plate and bearing metal melt flowing through; the tundish is mainly used for refining and modification and degassing operation of the melt, and regulating and controlling the temperature and flow conditions of the melt, so that gas and non-metallic inclusions in the melt can be removed to the maximum extent, namely, short-circuit flow is prevented, dead zones are reduced, the streamline direction is improved, the residence time of the melt is increased, and the superheat degree of the metal melt is kept stable; the casting flow plate is mainly used for distributing metal melt to uniformly flow into each crystallizer, so that the batch production of a plurality of ingots is realized.
In the casting process of the aluminum alloy flow plate, magnetic field applying devices are respectively arranged on the periphery of a flow channel, the periphery of a tundish and a plane above the cast flow plate, each magnetic field applying device mainly comprises a silicon steel sheet iron core, an excitation coil and a cooling water cavity, and the excitation coil is uniformly wound on the silicon steel sheet iron core and fixed in the cooling water cavity; the magnet exciting coils are connected through connecting wires and connected with a power supply generating system, and different forms of magnetic fields can be generated by introducing different forms of currents into the power supply generating system. In the process that the metal melt flows through the runner, the tundish and the casting runner plate, magnetic fields in different forms can be applied to treat the metal melt in different stages, so that the flowing and stirring of the metal melt are controlled, the temperature and the component distribution of the melt are uniform, the microstructure of the melt is changed, and the like.
In the method, the number of the excitation coils respectively arranged around the runner, at the periphery of the tundish and above the casting runner plate can be 2n or 3m or 2n +3m, n and m are natural numbers which are more than or equal to 1, and the coils are divided into n groups or m groups to be respectively applied with pulse current or three-phase sine alternating current: applying a pulse current to the 2n excitation coils; and applying three-phase sinusoidal alternating current to the 3m excitation coils, wherein each m excitation coils are connected in series to serve as one-phase load of the three-phase sinusoidal alternating current.
In the above method, the power generation system may generate a pulsed current and a three-phase sinusoidally alternating current, and the electromagnetic parameters are preferably adjusted within the following ranges: intensity of currentI1-500A, electromagnetic frequencyƒAnd =1 to 80Hz, and the target magnetic field strength B =1 to 500mT can be finally obtained in the metal melt area.
In the method, the excitation coil preferably adopts a waterproof high-low voltage submersible motor winding wire consisting of an enameled copper conductor and a polyethylene insulating nylon sheath, an oxygen-free copper wire is used as a conductor, and the specification of the excitation coil is stranded and is 7/0.5 mm-7/1.5 mm.
In the method, each excitation coil winding is preferably 30-500 turns, and the number of the laminated layers is 2-50.
In the method, the winding mode of the excitation coil comprises a tooth-shaped winding and a Cramer winding, and different winding modes are set according to the magnetic field requirement modes at different positions; the excitation coils can be wound on the iron core magnet yoke or the iron core magnet pole during the tooth-shaped winding, each excitation coil is an independent device during the Cramer winding, the excitation coils are connected with each other through connecting wires, the connection mode comprises single-side sequential connection, single-side interval connection, double-side sequential connection and double-side interval connection, and the interval number of the excitation coils can be any number during connection according to the number of the actual excitation coils.
In the method, when the excitation coil is introduced with three-phase sinusoidal alternating current, the connection mode between three-phase excitation coil loads comprises a Y-type connection mode and a delta connection mode; the Y-type connection method generates a traveling wave magnetic field when the phase difference is 120 degrees, the delta-type connection method generates a rotating magnetic field when the phase difference is 120 degrees.
In the above method, the silicon steel sheet for winding the field coil is shaped like E or rectangle, and the outer surface is coated with the insulating varnish.
In the method, the rectangular silicon steel sheets adopt a structure of a single cooling water cavity of a single magnet exciting coil device, and each E-shaped silicon steel sheet adopts an independent cooling water cavity for the magnet exciting coil device wound by the E-shaped silicon steel sheets.
In the method, the excitation coils around the flow channel can be distributed on one side, two sides or the bottom of the flow channel; the excitation coils at the periphery of the tundish are distributed on the outer side of a plane parallel to the flow direction of the metal melt, and a plurality of layers are distributed in the height direction; the excitation coils on the casting flow plate are arranged above the casting flow plate, the distance between the excitation coils in the horizontal direction is 10-50 mm, and the distance between the excitation coils in the height direction is 20-50 mm.
In the method, the distance between the excitation coil positioned in the cooling water cavity and the wall of the cooling water cavity is 5-100 mm: the distance between the inner wall of the cooling water cavity and the excitation coil is 5-10 mm at the water outlet side of the cooling water cavity; the distance between the inner wall of the cooling water cavity and the magnet exciting coil is more than or equal to 10mm except the water outlet side. The distance between the magnet exciting coil and the wall of the cooling water cavity close to the side of the metal melt is small, and the distance between the magnet exciting coil and the other side is large, so that the magnet exciting coil can be sufficiently cooled. The exciting coil is water-cooled.
In the method, the distance between the cooling water cavity and the outer side wall of the runner and the outer side wall of the tundish is less than or equal to 10mm, and the upper surfaces of the cooling water cavity on the outer side of the runner and the tundish are lower than the upper surface of the metal melt, so that the magnetic field can effectively enter the metal melt and act on the metal melt area.
In the method, the heat-insulating material coated on the outer wall of the flow channel and the material of the cooling water cavity are preferably non-magnetic stainless steel.
The main technical idea of the invention is as follows:
the method overcomes the defect that the traditional aluminum alloy flow plate type casting cannot apply an external field to treat the melt, and simultaneously avoids the complex process of adding coils at the crystallizer inside the casting flow plate, adopts the method of applying an electromagnetic field to fully treat the metal melt from a smelting furnace to the crystallizer in the casting process, the whole process is carried out in a metal melting state, so that the sufficient magnetic field treatment time can be ensured, meanwhile, the purposes of setting excitation coils for different parts, applying different magnetic field forms and electromagnetic conditions can be realized, the electromagnetic action range is wider and can be adjusted as required, the effects of melt purification, melt stirring, vibration to make the components and temperature distribution uniform, and melt microstructure and the like can be changed in different stages, and thus, a fine-grained, uniform and pure high-quality alloy ingot blank is prepared. The invention fully exerts the effect of the electromagnetic field on the alloy melt, obviously improves the structure and the components of the alloy casting blank and improves the ingot casting performance.
Through the technical means, the invention has the following advantages and positive effects:
1. the electromagnetic stirring device can simultaneously realize the application of different magnetic field forms and electromagnetic conditions on different parts, has wider electromagnetic action range and can be adjusted as required, and can respectively realize the effects of melt purification, melt stirring, vibration, uniform distribution of components and temperature, change of melt microstructure and the like in different stages;
2. the full-flow treatment can be carried out on the metal melt in the flowing, refining and modification processes before the metal is solidified, the sufficient magnetic field treatment time can be ensured, the melt treatment efficiency is high, the effect is good, the element segregation of the alloy ingot blank is greatly reduced, the grain size is greatly reduced, and the mechanical property and the yield are obviously improved;
3. the size, the number and the position of the magnetic field applying devices can be accurately adjusted, the preparation method can be suitable for the preparation of ingot blanks with different specifications and numbers, and the adaptability of production fields, positions and scales is strong;
4. when the electromagnetic force acts on the metal melt, the metal melt is not in direct contact with the molten metal, and the metal melt is clean and pollution-free;
5. the related device has simple structure, and the structure of the casting flow table and other casting tools do not need to be changed;
6. particularly aiming at the batch casting production process of the aluminum alloy ingot blank flow plate, the action device of the method has simple and compact structure and is convenient to mount, dismount and adjust.
Drawings
FIG. 1 is a schematic view of an apparatus for electromagnetic treatment of an aluminum alloy stream disk casting melt according to the present invention;
FIG. 2 shows the shape of a silicon steel sheet according to the present invention, wherein (a) is an E-type silicon steel sheet and (b) is a rectangular silicon steel sheet;
fig. 3 is a schematic diagram of the field coil winding of the present invention, wherein (a) is a core yoke winding type of a tooth winding, (b) is a core pole winding type of a tooth winding, and (c) is a crime winding;
FIG. 4 is a schematic diagram showing the connection of the excitation coils when pulse currents are connected, wherein (a) is a one-side sequential connection, (b) is a one-side interval connection, (c) is a two-side sequential connection, and (d) is a two-side interval connection;
FIG. 5 is a schematic view showing the connection of the exciting coils when three-phase sinusoidal alternating currents are connected, wherein (a) is a one-side sequential connection, (b) is a one-side alternate connection, (c) is a two-side sequential connection, and (d) is a two-side alternate connection;
FIG. 6 is a schematic view of convection inside a runner melt, wherein (a) is continuous convection and (b) is oscillating convection;
FIG. 7 is a schematic view of convection inside a tundish melt, wherein (a) is continuous convection and (b) is oscillating convection;
FIG. 8 is a schematic view of the melt flow within the melt in the casting flow plate, wherein (a) is continuous convection and (b) is oscillating convection.
The reference numbers in the drawings are as follows:
the method comprises the following steps of 1-a smelting furnace, 2-a silicon steel sheet iron core, 3-a magnet exciting coil, 4-a runner, 5-a tundish, 6-a casting flow plate, 7-a metal melt, 8-a connecting wire, 9-a power supply generation system, 10-a metal melt liquid level and 11-a melt flow track schematic diagram.
Detailed Description
The method and apparatus of the present invention will be further described with reference to the accompanying drawings for further illustration and description of the method of the present invention, and not as a limitation of the invention.
In the embodiment of the invention, 20 aluminum alloy round ingots in 5 rows and 4 columns are cast by a flow plate.
The specification of the waterproof high-low voltage submersible motor winding wire adopted by the excitation coil 3 in the embodiment of the invention is 7/1 mm.
In the embodiment of the invention, the silicon steel sheet iron core 2 is formed by stacking E-shaped or rectangular silicon steel sheets, insulating paint is coated on the surfaces of the silicon steel sheets, the thickness of each sheet is about 3.5mm, and the number of the laminated sheets is 12.
In the embodiment of the invention, the power supply generating system 8 is adopted to generate pulse current and three-phase sine alternating current to be led into the excitation coil 3, wherein the connection mode of the load excitation coil 3 of the three-phase sine alternating current is Y-shaped connection. Those skilled in the art will understand that the delta connection can be replaced according to actual needs.
In the embodiment of the invention, the magnet exciting coils 3 outside the runner 4 are distributed on one side or two sides of the runner, the magnet exciting coils 3 at the periphery of the tundish 5 are distributed on one side or two sides outside a plane parallel to the flow direction of the metal melt, and 3 layers are distributed in the height direction; the excitation coil 3 on the casting flow plate 6 is arranged above the flow plate; the interval between the exciting coils 4 in the horizontal direction is 25mm, and the interval in the height direction is 50 mm.
In the embodiment of the invention, the distance between the excitation coil 3 in the cooling water cavity and the cooling water cavity wall close to the side of the molten metal is 10mm, and the distance between the excitation coil and the cooling water cavity wall on the opposite side is 50 mm.
In the embodiment of the invention, the distance between the coil cooling water cavity and the outer side wall of the flow channel 4 and the outer side wall of the tundish 5 is 5mm, the upper surfaces of the exciting coil 3 outside the flow channel 4 and the tundish 5 are about 30mm lower than the metal liquid level, and the distance between the bottom surface of the cooling water cavity where the exciting coil 3 above the casting flow plate 6 is located and the platform surface of the casting flow plate 6 is 10 mm.
The invention is further described below with reference to the figures and the examples.
An example of an implementation of the structure according to fig. 1 and the connection according to fig. 4 and 5 is as follows:
example 1
The schematic diagram of the working mode of electromagnetic melt treatment in the casting process of the aluminum alloy round ingot runner plate is shown in fig. 1, and a main casting device is mainly composed of a smelting furnace 1, a tundish 5, a casting runner plate 6 and a runner 4. The magnetic field applying device comprises an excitation coil 3, a silicon steel sheet iron core 2 for winding the excitation coil 3 and a cooling water cavity which is not shown in the figure, and is connected with a power supply generating system 9 through a connecting lead 8 to generate different forms of magnetic fields to act on the metal melt 7.
The width of the flow channel is narrow, the outer side of the flow channel is distributed by adopting a single-side magnet exciting coil according to the difference of the length of the flow channel, and the silicon steel sheet iron core is distributed on the outer side of the flow channel in a mode of combining an E-shaped silicon steel sheet (a) and a rectangular silicon steel sheet (b) in the figure 2. The E-shaped silicon steel sheet excitation coil is wound on the iron core magnetic yoke as shown in fig. 3 (a), and the rectangular silicon steel sheet excitation coil is wound as shown in fig. 3 (c).
The magnet exciting coil on the outer side surface of the tundish, which is parallel to the flow direction of the metal melt, adopts a bilateral distribution mode, and a coil arrangement mode is adopted at the same flow passage of the silicon steel sheet iron core and the magnet exciting coil winding.
The arrangement of the excitation coil at the casting flow plate adopts a form of uniform distribution at two sides, the silicon steel sheet structure and the coil winding form are shown in fig. 3 (b), an E-shaped silicon steel sheet is adopted, and the excitation coil is wound on the iron core pole.
The excitation coil connections at the runner, tundish and cast runner are all made in a sequential manner, as shown in fig. 4 (a) (single-sided) and fig. 4 (c) (double-sided).
The exciting coil applies a pulse current.
When the casting is started and the level of the flowing metal is stable, the power generation system is turned on, the current intensity and frequency of the facility are adjusted, and the target magnetic field is applied. Before applying the magnetic field, the circulating cooling water is started to cool the magnet exciting coil.
And after the casting is finished and the cast ingot is completely solidified, turning off the power generation system and the circulating cooling water.
In the method, the melt flow state schematic diagrams of the metal melt in the runner, the tundish and the casting flow table are respectively shown in fig. 6 (b), fig. 7 (b) and fig. 8 (b), the metal melt has larger oscillation amplitude, and a certain shearing action exists in the melt flow horizontal direction, so that the melt temperature distribution is more uniform, and the solidification structure is obviously refined.
Example 2
The method is the same as example 1, except that:
the excitation coils at the runner, the tundish and the casting runner are connected in a manner of single-side interval connection and double-side cross connection, as shown in fig. 4 (b) and 4 (d).
In the method, the schematic flow state diagrams of the metal melt in the runner, the tundish and the casting flow plate are respectively shown in fig. 6 (b), fig. 7 (b) and fig. 8 (b), but the oscillation amplitude of the metal melt is smaller than that of the method in the embodiment 1, and meanwhile, the convection effect is stronger than that of the method in the embodiment 1, so that the component distribution of the melt is more uniform, and the segregation rate of the cast ingot is reduced.
Example 3
The method is the same as example 1, except that:
the exciting coil applies a three-phase sinusoidal alternating current.
The excitation coils at the runner, the tundish and the casting runner are connected in sequence, as shown in fig. 5 (a) and 5 (c).
In the method, the schematic flow state diagrams of the metal melt in the runner, the tundish and the casting flow plate are respectively shown in fig. 6 (a), fig. 7 (a) and fig. 8 (a), the metal melt has stronger convection, the melt temperature field and the component distribution are uniform, and the uniformity of the solidification structure is improved.
Example 4
The method is the same as example 1, except that:
the exciting coil applies a three-phase sinusoidal alternating current.
The excitation coils at the runner, the tundish and the casting runner are connected in a manner of single-side interval connection and double-side cross connection, as shown in fig. 5 (b) and 5 (d).
In the method, the schematic flow states of the metal melt in the runner, the tundish and the casting flow plate are respectively shown in fig. 6 (a), fig. 7 (a) and fig. 8 (a), the convection effect of the metal melt is weakened compared with that of the embodiment 1, but the melt oscillation effect is enhanced, and the solidification structure can be effectively refined.
Example 5
The method is the same as example 1, except that:
the width of the flow channel is wide, and the outside of the flow channel adopts a mode of bilateral excitation coil distribution.
The connection between the exciting coils is as shown in fig. 4 (c).
In the method, the schematic view of the flowing state of the metal melt in the runner is shown in fig. 6 (b), the edge part of the melt has stronger oscillation effect, the center of the runner has weaker oscillation effect, and the method can be applied to the metal melt treatment of the runner with a narrower section and effectively refine the solidification structure.
Example 6
The method is the same as example 5, except that:
the connection between the exciting coils is as shown in fig. 4 (d).
In the method, the schematic flow state of the metal melt in the runner is shown in fig. 6 (b), the convection of the metal melt is weakened, the oscillation effect is enhanced, and the solidification structure can be obviously refined.
Example 7
The method is the same as example 5, except that:
the exciting coil applies a three-phase sinusoidal alternating current.
The connection between the exciting coils is as shown in fig. 5 (c).
In this method, the schematic flow state of the metal melt in the runner is shown in fig. 6 (a), which can effectively improve the temperature distribution of the melt and reduce the segregation rate of the alloy.
Example 8
The method is the same as example 7, except that:
the connection between the exciting coils is as shown in fig. 5 (d).
In the method, the schematic view of the flowing state of the metal melt in the runner is shown in fig. 6 (a), but compared with the embodiment 1, the melt shear oscillation flowing effect is enhanced, and the method can be applied to the melt treatment of the runner with a large cross section and can effectively refine the alloy solidification structure.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made to the present invention without departing from the spirit of the present invention should be included in the protection scope of the present patent claims.
Claims (10)
1. The electromagnetic treatment method for the melt cast by the aluminum alloy flow plate is characterized in that the aluminum alloy metal melt flows through a runner, a tundish and a cast flow plate in the casting process of the aluminum alloy flow plate, magnetic field applying devices are arranged on the periphery of the runner, the periphery of the tundish and the plane above the cast flow plate in the casting process, and each magnetic field applying device comprises a silicon steel sheet iron core, an excitation coil and a cooling water cavity; the excitation coil is uniformly wound on the silicon steel sheet iron core and is fixed in the cooling water cavity; the excitation coils are connected through connecting wires and connected with a power supply generating system, currents in different forms can be introduced through the power supply generating system to generate magnetic fields in different forms, and the same or different forms of magnetic fields are applied to metal melts in different stages to treat the metal melts in the process that the metal melts flow through a runner, a tundish and a casting flow plate.
2. The electromagnetic treatment method for the melt cast by the aluminum alloy runner plate, according to claim 1, is characterized in that the power supply generation system can generate pulsating direct current and three-phase sine alternating current, the current intensity I = 1-500A, the electromagnetic frequency ƒ = 1-80 Hz, and the magnetic field intensity of 1-500 mT can be obtained in the metal melt area.
3. The method for electromagnetically treating the melt cast by the aluminum alloy runner plate, according to claim 2, is characterized in that 2n or 3m or 2n +3m excitation coils are respectively arranged around the runner, the periphery of the tundish and the upper plane of the cast runner plate, wherein n and m are natural numbers which are more than or equal to 1; applying a pulse current to the 2n excitation coils; and applying three-phase sinusoidal alternating current to the 3m excitation coils, wherein each m excitation coils are connected in series to serve as one-phase load of the three-phase sinusoidal alternating current.
4. The method for electromagnetically treating the melt cast by the aluminum alloy flow table according to any one of claims 1 to 3, wherein the excitation coil is a waterproof high-low voltage submersible motor winding wire consisting of an enameled copper conductor and a polyethylene insulating nylon sheath, an oxygen-free copper wire is used as a conductor, and the specification of the excitation coil is stranded in a range of 7/0.5 mm-7/1.5 mm.
5. The method of claim 1 to 3, wherein each of the field coil windings has 30 to 500 turns and the number of laminated layers is 2 to 50.
6. The method of any one of claims 1 to 3, wherein the winding pattern of the excitation coil includes a tooth winding and a Cramer winding; when the tooth-shaped winding is used, the excitation coils are wound on the magnetic yokes or the iron core poles of the silicon steel sheet iron core, and when the Cramer winding is used, each excitation coil is an independent device.
7. The method of any one of claims 1 to 3, wherein the magnetic field coils of the magnetic field applying device around the runner are distributed on one side, two sides or the bottom of the runner, the magnetic field coils of the magnetic field applying device around the tundish are distributed outside a plane of the tundish parallel to the flow direction of the molten metal, and the tundish is distributed in a single layer or multiple layers in the height direction.
8. The method of claim 7, wherein the connection mode of the excitation coils comprises single-side sequential connection, single-side interval connection, double-side sequential connection and double-side interval connection, and the number of the intervals of the excitation coils in the interval connection is any number according to the number of the actual excitation coils.
9. The method for electromagnetically treating the melt cast by the aluminum alloy flow plate according to any one of claims 1 to 3, wherein the outer wall of the flow channel is coated with a heat insulating material, the heat insulating material is made of nonmagnetic stainless steel, and the cooling water cavity is made of nonmagnetic stainless steel.
10. The method for electromagnetically treating the melt cast by the aluminum alloy runner plate according to claim 2 or 3, wherein when the exciting coil is supplied with three-phase sinusoidal alternating current, the connection mode between the loads of the three-phase exciting coil is Y-shaped connection or delta connection.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114406220A (en) * | 2022-01-25 | 2022-04-29 | 内蒙古科技大学 | Electrical aluminum conductor and preparation method thereof |
| CN115415507A (en) * | 2022-08-12 | 2022-12-02 | 中国兵器装备集团西南技术工程研究所 | Device for intervening solidification process of aluminum alloy melt through magnetic field |
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| CN114406220A (en) * | 2022-01-25 | 2022-04-29 | 内蒙古科技大学 | Electrical aluminum conductor and preparation method thereof |
| CN115415507A (en) * | 2022-08-12 | 2022-12-02 | 中国兵器装备集团西南技术工程研究所 | Device for intervening solidification process of aluminum alloy melt through magnetic field |
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