CN112808957A - Casting crystallizer of high-alloying alloy cast rod and preparation method thereof - Google Patents
Casting crystallizer of high-alloying alloy cast rod and preparation method thereof Download PDFInfo
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- CN112808957A CN112808957A CN202011637976.1A CN202011637976A CN112808957A CN 112808957 A CN112808957 A CN 112808957A CN 202011637976 A CN202011637976 A CN 202011637976A CN 112808957 A CN112808957 A CN 112808957A
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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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/055—Cooling the moulds
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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
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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
- B22D11/116—Refining the metal
- B22D11/117—Refining the metal by treating with gases
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Abstract
The invention provides a casting crystallizer of a high-alloying alloy cast rod and a preparation method thereof, wherein the casting crystallizer comprises a water tank, a flow guide pipe, a crystallizer and an electromagnetic coil assembly, wherein the flow guide pipe is embedded in the water tank; the crystallizer is arranged in the water tank accommodating cavity, the upper end of the crystallizer is hermetically connected with the lower end of the flow guide pipe, and the lower end of the crystallizer is hermetically connected with the side wall at the opening of the water tank; at least a first graphite ring is arranged in the crystallizer, the first graphite ring is respectively communicated with a water supply system and a gas supply system, and a steam film is formed between the first graphite ring and the alloy cast rod; the electromagnetic coil assembly at least comprises a plurality of L-shaped electromagnetic coils, and the electromagnetic coils are arranged close to the upper part of the crystallizer. The crystallizer can effectively improve the problems of thick and uneven solidification structure and serious component segregation of a high-alloying alloy cast rod and obviously improve the surface quality of the cast rod by arranging the first graphite ring and designing the electromagnetic coil into an L-shaped structure.
Description
Technical Field
The invention relates to the technical field of metal powder preparation, in particular to a casting crystallizer of a high-alloying alloy cast rod and a preparation method thereof.
Background
In the casting process of the high-alloying alloy bar, because the alloying elements contained in the high-alloying alloy bar are high in component, the phenomena of thick and uneven solidification structure and serious component segregation inevitably exist due to the characteristics of sequential solidification and selective crystallization of the alloy during solidification, and the service performance of the casting bar is influenced; meanwhile, the phenomenon of uneven temperature of the alloy melt is inevitable in the semi-continuous casting process. In order to solve the above problems, the solidification process of the high-alloy and the gold alloy is usually disturbed by applying a physical external field, which mainly comprises an electromagnetic field, gas disturbance, ultrasonic vibration and the like.
Although the problems of coarse solidification structure and serious component segregation can be solved by applying a physical external field, the surface quality of the high-alloying cast rod is not obviously improved.
Disclosure of Invention
The invention mainly aims to provide a casting crystallizer of a high-alloying alloy cast rod and a preparation method thereof, wherein a first graphite ring is arranged in the casting crystallizer and is respectively communicated with a water supply system and a gas supply system, so that a steam film is formed between the first graphite ring and the alloy cast rod, and the electromagnetic coil is designed to be L-shaped, so that the problems of thick and uneven solidification structure and serious component segregation of the high-alloying alloy cast rod can be effectively improved, meanwhile, the surface quality of the cast rod is obviously improved, and the technical problems that the solidification structure of the high-alloying alloy cast rod is thick and uneven and the surface quality cannot be simultaneously improved in the prior art are solved.
In order to achieve the above object, according to a first aspect of the present invention, there is provided a casting mold for a highly alloyed alloy cast rod.
The casting crystallizer of the high-alloying alloy cast rod comprises:
the water tank comprises an accommodating cavity with an opening at the bottom;
the flow guide pipe penetrates through the side wall of the top of the water tank, and the lower end of the flow guide pipe is positioned in the accommodating cavity;
the crystallizer is arranged in the accommodating cavity, the upper end of the crystallizer is hermetically connected with the lower end of the flow guide pipe, and the lower end of the crystallizer is hermetically connected with the side wall of the opening of the water tank; the crystallizer is at least internally provided with a first graphite ring which is respectively communicated with a water supply system and a gas supply system, and a steam film is formed between the first graphite ring and the alloy cast rod;
and the electromagnetic coil assembly at least comprises a plurality of electromagnetic coils, the electromagnetic coils are of an L-shaped structure, and the plurality of electromagnetic coils are arranged close to the upper part of the crystallizer.
Furthermore, the electromagnetic coil assembly further comprises a supporting frame, the electromagnetic coils are all located in the supporting frame and are arranged independently, one ends of the electromagnetic coils are connected to the supporting frame respectively, and the other ends of the electromagnetic coils are free ends; the plurality of electromagnetic coils are uniformly distributed along the circumferential direction of the support frame.
Furthermore, the supporting frame is a hexagonal frame, six electromagnetic coils are arranged, the opening of each electromagnetic coil is arranged upwards, and the vertical end of each electromagnetic coil is a free end; and the distance L between the connection part of the guide pipe and the crystallizer and the electromagnetic coil is 50-80 mm.
Further, the first graphite ring is of a porous structure, the crystallizer is respectively provided with a ventilation channel and a water channel which penetrate through the side wall of the crystallizer, and the ventilation channel and the water channel are respectively communicated with the first graphite ring;
the water through hole channel is connected to the upper end of the first graphite ring, and the air through hole channel is connected to the middle of the first graphite ring.
Further, the pore diameters of the air duct and the water duct are respectively 2 +/-0.5 mm.
Furthermore, two sections of graphite rings are arranged in the crystallizer, namely a second graphite ring and a first graphite ring, the second graphite ring is connected above the first graphite ring in a sealing manner, and one end of the second graphite ring is connected with the draft tube in a sealing manner.
Furthermore, be equipped with the draw-in groove on the first graphite ring, correspond on the second graphite ring and be equipped with the plug, first graphite ring with second graphite ring joint.
Furthermore, a water through cavity is formed in the crystallizer, and the water through cavity is arranged close to the first graphite ring.
In order to achieve the above object, according to a second aspect of the present invention, there is provided a method for producing a highly alloyed alloy cast rod.
The preparation method of the high-alloying alloy cast rod adopts the casting crystallizer, and comprises the following steps:
obtaining high-alloying alloy melt, and pouring at a certain temperature;
the high-alloying molten alloy flows into a crystallizer and starts casting;
when the casting length is 400-600 mm, starting pulse water feeding and ventilation to form a vapor film on the first graphite ring; wherein: the air pressure is 1.0 plus or minus 0.1MPa, the continuous casting speed is 280 plus or minus 5mm/min, and the cooling water flow is 260 plus or minus 20L/min;
and (5) obtaining the high-alloying alloy cast rod after the casting is finished.
Further, the pouring temperature of the high-alloying molten alloy is 860 +/-10 ℃;
in the casting process, when the casting temperature is 740 +/-20 ℃, electromagnetic stirring is started, the stirring current is 60 +/-5A, and the stirring frequency is 40 +/-5 Hz.
The invention combines a physical external field (electromagnetic field) and a vapor film, improves the problems of coarse and uneven solidification structure and serious component segregation of a high-alloying alloy cast rod, obviously improves the surface quality of the cast rod, but combines the two methods to have the following technical difficulties:
generally, the higher the stirring intensity of the electromagnetic field, the better the stirring effect, but the gas film method improves the contact between the solidified shell and the inner wall of the graphite ring and simultaneously reduces the stability of the solidified shell, so the solidified shell can be damaged by the higher stirring intensity, and the continuous casting production failure is caused.
Because the electromagnetic field method needs to add excitation to the electromagnetic coil to stir the alloy melt, a continuous casting water tank with larger internal volume is needed, the heights of the crystallizer and the flow guide pipe are increased, and the uniformity of the temperature field of the alloy melt is reduced, so that higher requirements are provided for the internal structure of the continuous casting water tank and the stirring position of the electromagnetic coil.
In order to solve the technical difficulty of combining an electromagnetic field method and a gas film method, the invention changes the traditional electromagnetic stirring method that the strongest stirring area is arranged at the solidification front (a cold area) into the traditional electromagnetic stirring method that the distance from the solidification front to the upper part is controlled to be 50-80 mm, thereby ensuring the stirring strength under the condition of not damaging the solidified shell. Although the effect of changing the stirring area can be achieved by simply moving the electromagnetic coil upwards, the thickness of the continuous casting water tank is increased, and the heights of the crystallizer and the flow guide pipe are increased, so that the uniformity of the temperature field of the alloy melt in the flow guide pipe is reduced. The invention can realize the upward movement of the stirring area by a special electromagnetic coil structure on the premise of not changing the position of the electromagnetic coil, thereby not changing the structures of the continuous casting water tank, the crystallizer and the flow guide pipe.
On the other hand, the combination of electromagnetic stirring and gas film is not a single function superposition, and has strict requirements on process parameters. In order to achieve the necessary electromagnetic thrust and simultaneously reduce the volume of the electromagnetic coil as much as possible, the electromagnetic coil is often designed to work under the conditions of high current and low frequency, and the aluminum liquid in the stirring state cannot damage a vapor film generated on the inner wall of the graphite ring in the solidification process, so that the electromagnetic coil has higher requirements on the setting and stability of air pressure and water pressure.
Simultaneously, traditional graphite ring and porous graphite ring are the integral type structure, reach the gas permeability of graphite ring, surface quality all can reduce after certain number of times of use, cause the influence to the life of graphite ring.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic cross-sectional view of a casting mold for casting a highly alloyed alloy cast bar according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a first graphite ring attached to a second graphite ring in an embodiment of the present invention;
FIG. 3 is a surface view of a cast bar prepared by vapor film and stirred continuous casting in an example of the present invention;
FIG. 4 is a surface view of a cast rod obtained by continuous casting using a conventional process;
FIG. 5 is a metallographic structure of a cast bar prepared by vapor deposition and continuous casting with stirring according to an embodiment of the present invention;
FIG. 6 is a metallographic structure of a cast bar obtained by continuous casting using a conventional process;
FIG. 7 is a schematic diagram of an electromagnetic coil assembly according to an embodiment of the present invention.
In the figure:
1. a water tank; 2. a flow guide pipe; 3. an electromagnetic coil; 4. a crystallizer; 5. a second graphite ring; 6. a first graphite ring; 7. a water through cavity; 8. a vent passage; 9. a water passage; 10. a card slot; 11. a frame is supported.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The invention discloses a casting crystallizer of a high-alloying alloy cast rod, which comprises a water tank 1, a flow guide pipe 2, a crystallizer 4 and an electromagnetic coil assembly as shown in figure 1, wherein: the water tank 1 comprises a containing cavity with an opening at the bottom; the guide pipe 2 penetrates through the side wall of the top of the water tank 1, and the lower end of the guide pipe 2 is positioned in the containing cavity; the crystallizer 4 is arranged in the accommodating cavity, the upper end of the crystallizer 4 is hermetically connected with the lower end of the guide pipe 2, and the lower end of the crystallizer 4 is hermetically connected with the side wall of the opening of the water tank 1; at least a first graphite ring 6 is arranged in the crystallizer 4, the first graphite ring 6 is respectively communicated with a water supply system and an air supply system, and a steam film is formed between the first graphite ring 6 and the alloy cast rod; the electromagnetic coil assembly at least comprises a plurality of electromagnetic coils 3 which are of L-shaped structures, and the electromagnetic coils 3 are all arranged in the water tank 1 and are arranged above the crystallizer 4.
In the above embodiment, the draft tube 2 is embedded in the upper part of the water tank 1, the first graphite ring 6 is arranged in the crystallizer 4, and the first graphite ring 6 is respectively communicated with the water supply system and the gas supply system, so that a steam film is formed between the first graphite ring 6 and the alloy cast rod, and the hard contact between the thin solidified shell formed at the early stage of alloy melt solidification and the inner wall of the graphite ring is changed into the flexible contact, thereby effectively improving the surface quality of the cast rod; meanwhile, the electromagnetic coil component is combined, and the structure of the electromagnetic coil 3 is designed, so that the stirring area can move upwards on the premise of not changing the position of the electromagnetic coil 3, and the structures of the continuous casting water tank 1, the crystallizer 4 and the flow guide pipe 2 are not required to be changed.
The number of the electromagnetic coils 3 may be selected according to actual needs, and is not particularly limited.
As another embodiment of the present invention, the electromagnetic coil assembly further includes a supporting frame 11, as shown in fig. 7, the plurality of electromagnetic coils 3 are all located in the supporting frame 11 and are arranged independently from each other, one end of each of the plurality of electromagnetic coils 3 is connected to the supporting frame 11, and the other end of each of the plurality of electromagnetic coils 3 is a free end; the plurality of electromagnetic coils 3 are uniformly distributed along the circumferential direction of the support frame 11.
As another embodiment of the present invention, the supporting frame 11 is a hexagonal frame, as shown in fig. 7, six electromagnetic coils 3 are provided, the opening of each L-shaped electromagnetic coil 3 is arranged upward, the vertical end of each electromagnetic coil 3 is a free end, as shown in fig. 1, and the design of the electromagnetic coil 3 can effectively move the stirring area upward without affecting the stability of the skull.
Further, the distance L between the connection part of the draft tube 2 and the crystallizer 4 and the electromagnetic coil 3 is within the range of 50-80 mm.
The direction of the electromagnetic thrust generated by electromagnetic stirring is mainly determined by the structure of the stirring coil, in the embodiment of the invention, the electromagnetic coil is in an L-shaped structure, the opening of the L-shaped structure is upward, and through the distribution principle of the direction of the magnetic field of the energized coil, the coil in the horizontal part of the L-shaped coil generates Lorentz force due to the interaction of eddy current and the magnetic field, the average value of the acting force in one period is directed to the inside of the melt, which is equivalent to generating inward pressure, and the vertically upward part of the L-shaped coil generates upward pressure, so that the magnetic field generated by the L-shaped coil is deflected upward. Therefore, the strongest stirring area is arranged on the solidification front (a cold area) and is changed into the upper part of the solidification front by changing the traditional electromagnetic stirring method, as shown in figure 1, the distance L is controlled within the range of 50-80 mm, and the stirring strength is further ensured under the condition of not damaging the solidified shell.
In another embodiment of the present invention, the first graphite ring 6 has a porous structure, and as shown in fig. 1, the mold 4 is provided with a vent channel 8 and a water channel 9 respectively penetrating the side wall thereof, and the vent channel 8 and the water channel 9 are respectively communicated with the first graphite ring 6.
In the embodiment of the invention, the air duct 8 and the water duct 9 are arranged on the crystallizer 4, so that the first graphite ring 6 is communicated with a water supply and air supply system, a steam film can be formed on the first graphite ring 6 with a porous structure, the hard contact between a thin solidified shell formed at the early stage of alloy melt solidification and the inner wall of the graphite ring is changed into the flexible contact, and the surface quality of the cast rod can be effectively improved.
In an embodiment of the present invention, the first graphite ring 6 is provided with a vent groove and a water passage groove, the water passage groove is located at the upper end, the vent groove is located at the middle part, the water passage channel 9 is connected to the upper end of the first graphite ring 6 through the water passage groove, the vent channel 8 is connected to the middle part of the first graphite ring 6 through the vent groove, and the gas and water enter the first graphite ring 6 through the vent groove and the water passage groove, respectively, to form a vapor film inside the first graphite ring 6.
As another embodiment of the present invention, the pore size of the vent hole 8 is in the range of 2. + -. 0.5 mm.
As another embodiment of the present invention, the pore diameter of the water passing pore canals 9 is within the range of 2 + -0.5 mm.
As another embodiment of the present invention, two sections of graphite rings, namely, a second graphite ring 5 and a first graphite ring 6, are disposed in the crystallizer 4, as shown in fig. 1, the second graphite ring 5 is connected above the first graphite ring 6, and one end of the second graphite ring 5 is hermetically connected to the draft tube 2.
As another embodiment of the present invention, the first graphite ring 6 is provided with a locking groove 10, and the second graphite ring 5 is correspondingly provided with a plug, as shown in fig. 2, the first graphite ring 6 is locked with the second graphite ring 5.
In the embodiment of the present invention, the graphite ring structure is a composite multi-segment graphite ring, and specifically includes a second graphite ring 5 and a first graphite ring 6, where the second graphite ring 5 of a common structure and the first graphite ring 6 of a porous structure are combined in the form of a clamping groove to form a multi-segment graphite ring structure.
As another embodiment of the present invention, the crystallizer 4 is provided with a water passing cavity 7, and as shown in fig. 1, the water passing cavity 7 is disposed close to the first graphite ring 6.
The invention also discloses a preparation method of the high-alloying cast rod, and the preparation method and the beneficial effects of the invention are explained in detail through specific embodiments.
Example 1:
(1) melting and heating quantitative high-silicon aluminum alloy ingots to 920 ℃ in an intermediate frequency furnace;
(2) modifying the aluminum liquid in an intermediate frequency furnace;
(3) setting the heat preservation temperature of the casting ladle to 750 ℃, and degassing and deslagging the casting ladle;
(4) controlling the temperature of the aluminum liquid at 850 ℃ for pouring;
(5) the molten aluminum flows into a crystallizer through a splitter plate to start casting, electromagnetic stirring is started when the casting temperature is controlled at 720 ℃, the stirring current is 60 +/-5A, and the stirring frequency is 35 Hz;
(6) after stirring is started, when the casting length is 400mm, pulse water feeding and ventilation are started, the air pressure is controlled to be 1.0 +/-0.1 MPa, the continuous casting speed is controlled to be 275mm/min, and the cooling water flow is controlled to be 240L/min;
(7) crystallizer graphite ring is the sectional type design, and aluminium liquid under the stirring state carries out the primary cooling through ordinary graphite ring earlier and congeals the shell, carries out follow-up cooling through the vapour membrane that forms on the porous graphite ring again, and the vapour membrane is formed on the porous graphite ring through the pore of ventilating and the pore of leading to the water by water and gas, continuously cools off under the effect of secondary cooling water afterwards, closes the electromagnetic stirring when cooling water pump closes, and the casting process finishes, obtains high-silicon aluminum alloy cast stick.
Example 2:
(1) melting and heating quantitative high-silicon aluminum alloy ingots to 940 ℃ in an intermediate frequency furnace;
(2) modifying the aluminum liquid in an intermediate frequency furnace;
(3) setting the heat preservation temperature of the casting ladle to 820 ℃, and degassing and deslagging the casting ladle;
(4) controlling the temperature of the aluminum liquid at 870 ℃ for pouring;
(5) the molten aluminum flows into a crystallizer through a diversion plate to start casting, electromagnetic stirring is started when the casting temperature is controlled at 760 ℃, the stirring current is 60 +/-5A, and the stirring frequency is 45 Hz;
(6) after stirring is started, when the casting length is 600mm, pulse water feeding and ventilation are started, the air pressure is controlled to be 1.0 +/-0.1 MPa, the continuous casting speed is controlled to be 285mm/min, and the cooling water flow is controlled to be 280L/min;
(7) crystallizer graphite ring is the sectional type design, and aluminium liquid under the stirring state carries out the primary cooling through ordinary graphite ring earlier and congeals the shell, carries out follow-up cooling through the vapour membrane that forms on the porous graphite ring again, and the vapour membrane is formed on the porous graphite ring through the pore of ventilating and the pore of leading to the water by water and gas, continuously cools off under the effect of secondary cooling water afterwards, closes the electromagnetic stirring when cooling water pump closes, and the casting process finishes, obtains high-silicon aluminum alloy cast stick.
The surface map and the metallographic structure map of the high-silicon aluminum alloy cast rod prepared in examples 1-2 are respectively shown in fig. 3 and 5, the surface map and the metallographic structure map of the casting obtained by continuous casting with the conventional process are respectively shown in fig. 4 and 6, and compared with the casting obtained by continuous casting with the conventional process, the surface quality of the cast rod produced by vapor film and stirring continuous casting in examples 1-2 is greatly improved, and the distribution uniformity and size of primary crystal silicon of the cast rod are obviously improved.
It is to be noted that the term "comprises" and any variations thereof in the description and claims of the present invention is intended to cover non-exclusive inclusions, such that the inclusion of a list of elements is not necessarily limited to those elements explicitly listed, but may include other elements not explicitly listed or inherent to such elements.
In the present invention, the terms "upper", "lower", "bottom", "top", "left", "right", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.
Furthermore, the description of "first," "second," etc. referred to in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A casting crystallizer for casting high-alloyed alloy bars, characterized in that it comprises:
a water tank (1) comprising a containing cavity with an opening at the bottom;
the guide pipe (2) penetrates through the side wall of the top of the water tank (1), and the lower end of the guide pipe (2) is positioned in the accommodating cavity;
the crystallizer (4) is arranged in the accommodating cavity, the upper end of the crystallizer (4) is hermetically connected with the lower end of the guide pipe (2), and the lower end of the crystallizer (4) is hermetically connected with the side wall at the opening of the water tank (1); at least a first graphite ring (6) is arranged in the crystallizer (4), the first graphite ring (6) is respectively communicated with a water supply system and a gas supply system, and a steam film is formed between the first graphite ring (6) and the alloy cast rod;
the electromagnetic coil assembly at least comprises a plurality of electromagnetic coils (3), the electromagnetic coils (3) are of L-shaped structures, and the electromagnetic coils (3) are arranged above the crystallizer (4) in a mode of being close to the crystallizer.
2. The casting crystallizer for the high alloyed cast rod according to claim 1, characterized in that the electromagnetic coil assembly further comprises a supporting frame (11), the plurality of electromagnetic coils (3) are all located in the supporting frame (11) and are independent from each other, one end of each of the plurality of electromagnetic coils (3) is connected to the supporting frame (11), and the other end is a free end; the plurality of electromagnetic coils (3) are uniformly distributed along the circumferential direction of the support frame (11).
3. The casting crystallizer for cast high alloyed rods according to claim 2, characterized in that said supporting frame (11) is a hexagonal frame, said solenoids (3) are provided in six and each solenoid (3) is provided with an opening facing upwards, the vertical end of each solenoid (3) being a free end;
the distance L between the connection part of the guide pipe (2) and the crystallizer (4) and the electromagnetic coil (3) is 50-80 mm.
4. The casting crystallizer for the high alloyed cast rod according to claim 1, characterized in that the first graphite ring (6) is of a porous structure, the crystallizer (4) is provided with air passages (8) and water passages (9) respectively passing through the side walls thereof, and the air passages (8) and the water passages (9) are respectively communicated with the first graphite ring (6);
the water through hole (9) is connected to the upper end of the first graphite ring (6), and the air through hole (8) is connected to the middle of the first graphite ring (6).
5. The casting crystallizer for highly alloyed cast rods according to claim 4, characterized in that the pore size of the aeration channels (8) and of the water channels (9) is 2 ± 0.5mm, respectively.
6. The casting crystallizer for the high alloyed cast rod according to the claim 1 or 4, characterized in that two sections of graphite rings, a second graphite ring (5) and a first graphite ring (6), are arranged in the crystallizer (4), the second graphite ring (5) is hermetically connected above the first graphite ring (6), and one end of the second graphite ring (5) is hermetically connected with the draft tube (2).
7. The casting crystallizer for the high-alloying cast rod according to claim 6, wherein the first graphite ring (6) is provided with a clamping groove (10), the second graphite ring (5) is correspondingly provided with a plug, and the first graphite ring (6) is clamped with the second graphite ring (5).
8. The casting crystallizer for the high alloyed cast rod according to claim 1, characterized in that the crystallizer (4) is provided with a water through cavity (7), and the water through cavity (7) is arranged close to the first graphite ring (6).
9. A method for producing a highly alloyed cast rod, characterized in that a casting mold according to any one of claims 1 to 8 is used, comprising the steps of:
obtaining high-alloying alloy melt, and pouring at a certain temperature;
the high-alloying molten alloy flows into a crystallizer and starts casting;
when the casting length is 400-600 mm, starting pulse water feeding and ventilation to form a vapor film on the first graphite ring; wherein: the air pressure is 1.0 plus or minus 0.1MPa, the continuous casting speed is 280 plus or minus 5mm/min, and the cooling water flow is 260 plus or minus 20L/min;
and (5) obtaining the high-alloying alloy cast rod after the casting is finished.
10. The method for preparing a highly alloyed alloy cast rod according to claim 9, wherein the casting temperature of the highly alloyed alloy melt is 860 ± 10 ℃;
in the casting process, when the casting temperature is 740 +/-20 ℃, electromagnetic stirring is started, the stirring current is 60 +/-5A, and the stirring frequency is 40 +/-5 Hz.
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| US5678623A (en) * | 1995-05-12 | 1997-10-21 | Norsk Hydro A.S. | Casting equipment |
| CN201239784Y (en) * | 2008-04-17 | 2009-05-20 | 北京天中祈华新材料有限公司 | Apparatus for producing high-silicon aluminum alloy bar |
| CN101332493A (en) * | 2008-07-31 | 2008-12-31 | 东北大学 | Gas film quick continuous casting device and method in magnetostatic field |
| CN202106003U (en) * | 2011-03-22 | 2012-01-11 | 天津福来明思铝业有限公司 | Device for producing hypereutectic silicon-aluminum alloy casting ingot |
| CN102319881A (en) * | 2011-09-29 | 2012-01-18 | 东北大学 | Equipment and method for simultaneously preparing multiple round aluminum alloy ingots |
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