Semi-continuous casting device system coupled with electromagnetic induction and aluminum alloy semi-continuous casting method

Abstract

The invention provides a semi-continuous casting device system coupled with electromagnetic induction and an aluminum alloy semi-continuous casting method. The device system comprises a hot top crystallizer, according to the flowing direction of molten alloy liquid, the hot top crystallizer comprises a heat preservation layer and a flow guide layer which are fixedly connected in sequence; a graphite lining is embedded in the inner wall of the heat preservation layer. A cooling device is arranged in the flow guide layer; a sizing ring is arranged at a bottom outlet of the flow guide layer; an electromagnetic induction device is arranged on the outer wall of the sizing ring; and a water scraping device is arranged between the cooling device and the electromagnetic induction device. By coupling the hot top crystallizer and the electromagnetic induction device, the temperature difference between the surface and the interior of the aluminum alloy cast ingot in the casting process can be reduced, casting stress is reduced, and casting cracks are eliminated.

Description

Technical Field

[0001] This invention belongs to the field of aluminum alloy casting technology, and relates to a semi-continuous casting of aluminum alloys, specifically to a semi-continuous casting device system coupled with electromagnetic induction and a semi-continuous casting method for aluminum alloys. Background Technology

[0002] Aluminum alloys and their processed materials possess a range of excellent properties, such as low density, high specific strength and stiffness, good elasticity, good impact resistance, corrosion resistance, wear resistance, high electrical and thermal conductivity, easy surface coloring, good machinability, and high recyclability. Direct water-cooled semi-continuous casting is the most core and widely used casting process in aluminum alloy production. It can effectively reduce ingot production costs, improve ingot surface quality, and enhance the internal quality of ingots.

[0003] For directly water-cooled semi-continuous casting of aluminum ingots, a significant proportion of scrap is caused by casting hot cracks. Because the presence of cracks disrupts the continuity of the metal structure, it cannot be pressed together in subsequent processing. Therefore, ingots with cracks are considered absolute scrap during inspection. The presence of casting cracks seriously affects the production efficiency and economic benefits of enterprises.

[0004] Currently, the solutions to the problem of cracking and scrapping in the aluminum alloy casting process mainly include: (1) using grain refiners, but some special aluminum alloys (such as high-purity aluminum alloys for semiconductors and aluminum alloys for aviation) have strict control over alloy elements, and the use of grain refiners will introduce impurity elements; (2) using a scraper to remove excess cooling water, but for aluminum ingots with high alloy content or large-sized aluminum ingots, the casting stress generated by the solidification of the ingot during the casting process is large enough, and the use of a scraper will still produce a large tendency to crack.

[0005] CN 111424196A discloses a civilian large-size 7-series aluminum alloy ingot and its preparation method. Specifically, it discloses an aerospace-grade aluminum alloy produced using a three-stage degassing and five-stage slag removal melt purification technology, a precise addition and efficient utilization technology for refining agents, and a precise casting temperature control technology, solving problems such as casting cracks. However, the equipment technology used is too complex and sophisticated, failing to significantly reduce production costs for enterprises. CN 101450372A discloses a water-cooling process for the ingot area during semi-continuous casting of aluminum alloys. Specifically, it discloses an automatic scraper device that reduces casting stress by removing excess cooling water, ultimately reducing the probability of casting cracks. However, for high-alloy aluminum ingots or large-size aluminum ingots, the casting stress generated by ingot solidification during casting is sufficiently large, and even with a scraper, a significant tendency for cracking still occurs.

[0006] In summary, it is necessary to provide a novel alloy semi-continuous casting device to reduce casting stress and eliminate casting cracks. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide a semi-continuous casting device system coupled with electromagnetic induction and a semi-continuous casting method for aluminum alloys. By coupling an electromagnetic induction heating system and a casting system, the present invention can reduce the temperature difference between the surface and interior of aluminum alloy ingots during the casting process, thereby reducing casting stress and eliminating casting cracks.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] In a first aspect, the present invention provides a semi-continuous casting apparatus system coupled with electromagnetic induction, the apparatus system including a hot-top crystallizer;

[0010] According to the flow direction of the molten alloy liquid, the hot top crystallizer includes a heat insulation layer and a flow guiding layer that are fixedly connected in sequence; the inner wall of the heat insulation layer is inlaid with a graphite liner; and a cooling device is provided in the flow guiding layer;

[0011] The bottom outlet of the flow guide layer is provided with a sizing ring; the outer wall of the sizing ring is provided with an electromagnetic induction device;

[0012] A water scraper is provided between the cooling device and the electromagnetic induction device.

[0013] In this invention, by modifying the hot top crystallizer and utilizing the heating principle of the electromagnetic induction device, the temperature difference between the surface and interior of the aluminum alloy ingot during the casting process can be reduced, casting stress can be reduced, and casting cracks can be eliminated.

[0014] Furthermore, the molten alloy liquid is cooled to form a solidified shell when it comes into contact with the graphite liner. Then, the internal solidification is accelerated by a cooling device to refine the grains and obtain an ingot. Finally, an electromagnetic induction device is used to reduce the temperature difference between the surface and the interior of the ingot, reduce casting stress, and eliminate casting cracks.

[0015] As a preferred embodiment of the present invention, a casting distribution plate is provided on the top of the hot top crystallizer.

[0016] Preferably, the bottom outlet of the sizing ring is provided with a spindle head.

[0017] As a preferred embodiment of the present invention, the graphite liner is independently connected to a compressed air machine and a demolding oil tank via a conveying pipe that penetrates the insulation layer.

[0018] Preferably, the release oil groove is used to supply release oil to the graphite liner.

[0019] Preferably, the thickness of the graphite liner is 5-10 mm, for example, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm, but not limited to the listed values; other values ​​within the range not listed are also applicable. The height is 10-25 mm, for example, 10 mm, 13 mm, 16 mm, 19 mm, 22 mm, or 25 mm, but not limited to the listed values; other values ​​within the range not listed are also applicable.

[0020] In this invention, the function of the compressed air machine includes: (1) the pressure provided by the compressed air machine causes the demolding oil in the demolding oil tank to form fine and dispersed oil droplets when it is transported to the surface of the graphite liner through the conveying pipe, forming a stable and continuous lubricating film, reducing the friction between the ingot and the crystallizer, and preventing the ingot from cracking. (2) providing pressure to the graphite liner to facilitate the demolding of the alloy.

[0021] As a preferred embodiment of the present invention, the cooling device includes a cooling water tank.

[0022] Preferably, the cooling water tank has an opening on the side near the inner wall of the guide layer.

[0023] As a preferred embodiment of the present invention, the wiping device includes a baffle plate and a wiping plate.

[0024] Preferably, the two ends of the baffle plate are fixedly installed at the bottom of the flow guiding layer and the outer wall of the sizing ring, respectively.

[0025] Preferably, the wiper blade is installed at one end near the outer wall of the sizing ring.

[0026] In this invention, the function of the scraping device is to scrape off excess cooling water to prevent the excess cooling water from rapidly lowering the surface temperature of the ingot, creating a large temperature difference with the core, thereby generating large internal stress and causing the ingot to crack and become unusable.

[0027] As a preferred embodiment of the present invention, the electromagnetic induction device is an electromagnetic induction coil wound around the outer wall of the sizing ring.

[0028] Preferably, the electromagnetic induction coil is electrically connected to a power source via a wire.

[0029] Preferably, the winding width of the electromagnetic induction coil is 100~170mm, for example, it can be 100mm, 120mm, 140mm, 150mm, 160mm or 170mm, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0030] If the winding width of the electromagnetic induction coil described in this invention is too large, it will result in energy waste and increased cost; if the width is too small, it will result in insufficient time for the ingot to stay in the heat treatment zone, and the internal stress cannot be effectively eliminated.

[0031] In a second aspect, the present invention provides a method for semi-continuous casting of aluminum alloys using the apparatus system provided in the first aspect, the casting method comprising:

[0032] The cooling device is turned on, and then the molten alloy liquid is injected into the hot top crystallizer for semi-continuous casting to obtain an ingot;

[0033] Once the ingot is separated from the guide layer, the scraping device and electromagnetic induction device are activated for electromagnetic heating.

[0034] As a preferred embodiment of the present invention, the cooling device is turned on and the compressed air is turned on.

[0035] Preferably, the cooling device includes the introduction of cooling water.

[0036] Preferably, the flow rate of the cooling water is 200~700L / min, for example, it can be 200L / min, 300L / min, 400L / min, 500L / min, 600L / min or 700L / min, but is not limited to the listed values. Other values ​​within the range that are not listed are also applicable.

[0037] Preferably, the temperature of the cooling water is 10~30℃, for example, it can be 10℃, 14℃, 18℃, 22℃, 26℃ or 30℃, etc., but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0038] As a preferred embodiment of the present invention, the temperature of the molten alloy liquid is 670~710℃, for example, it can be 670℃, 680℃, 690℃, 700℃ or 710℃, etc., but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0039] Preferably, the molten alloy liquid is a molten aluminum alloy liquid.

[0040] Preferably, the casting speed of the semi-continuous casting is 70~130mm / min, for example, it can be 70mm / min, 90mm / min, 110mm / min or 130mm / min, etc., but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0041] As a preferred embodiment of the present invention, the frequency of the electromagnetic heating is 10~20kHz, for example, it can be 10kHz, 12kHz, 14kHz, 16kHz, 18kHz or 20kHz, etc., but is not limited to the listed values. Other values ​​not listed within the range are also applicable.

[0042] Preferably, the power density of the electromagnetic heating is 0.3~0.6 W / cm². 2 For example, it could be 0.3 W / cm 2 0.4W / cm 2 0.5W / cm 2 Or 0.6W / cm 2 This applies to, but is not limited to, the listed values; other unlisted values ​​within the range are also applicable.

[0043] As a preferred embodiment of the present invention, the semi-continuous casting method for aluminum alloys provided in the second aspect of the present invention includes the following steps:

[0044] (1) Turn on the cooling device and introduce cooling water, and at the same time turn on the compressed air machine so that a layer of release oil adheres to the surface of the graphite liner;

[0045] The flow rate of the cooling water is 200~700L / min, and the temperature is 10~30℃;

[0046] (2) The molten aluminum alloy liquid with a temperature of 670~710℃ after refining is injected into the hot top crystallizer through the casting distribution plate. When it passes through the graphite liner, it is cooled to form a solidified shell and then pulled to the guide layer by the ingot head for semi-continuous casting (cooling water treatment) to obtain the ingot.

[0047] The casting speed of the semi-continuous casting is 70~130mm / min;

[0048] (3) After the ingot in step (2) is separated from the guide layer, the scraping device is started to remove the excess cooling water, and at the same time the electromagnetic induction device is started to perform electromagnetic heating.

[0049] The electromagnetic heating frequency is 10~20kHz, and the power density is 0.3~0.6W / cm³. 2 .

[0050] The numerical range described in this invention includes not only the point values ​​listed above, but also any point values ​​within the numerical ranges not listed above. Due to space limitations and for the sake of brevity, this invention will not exhaustively list all the specific point values ​​included in the range.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] (1) The semi-continuous casting device system with coupled electromagnetic induction provided by the present invention has a simple structure. By coupled electromagnetic induction, the temperature difference between the surface and the interior of the aluminum alloy ingot during the casting process can be reduced, casting stress can be reduced, and casting cracks can be eliminated.

[0053] (2) Through the synergistic effect of electromagnetic induction and the water scraping device, the present invention can further reduce the defects that may occur in the aluminum alloy casting process, such as large ingot stress and surface cracks.

[0054] (3) The semi-continuous casting method for aluminum alloys provided by the present invention is green, safe and pollution-free, and has strong adaptability to different types of aluminum alloys. Attached Figure Description

[0055] Figure 1 This is a schematic diagram of the semi-continuous casting device system with coupled electromagnetic induction provided in Embodiment 1 of the present invention;

[0056] Among them, 1 is molten alloy liquid, 2 is casting distribution plate, 3 is hot top crystallizer, 4 is graphite liner, 5 is compressed air machine, 6 is cooling water tank, 7 is demolding oil tank, 8 is scraper, 9 is power supply, 10 is electromagnetic induction coil, and 11 is ingot head. Detailed Implementation

[0057] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0058] Example 1

[0059] This embodiment provides a semi-continuous casting device system coupled with electromagnetic induction, such as... Figure 1 As shown, the device system includes a hot-top crystallizer 3;

[0060] According to the flow direction of the molten alloy liquid 1, the hot top crystallizer 3 includes a heat insulation layer and a flow guiding layer that are fixedly connected in sequence; the inner wall of the heat insulation layer is inlaid with a graphite liner 4; and a cooling device is provided in the flow guiding layer;

[0061] The bottom outlet of the flow guide layer is provided with a sizing ring; the outer wall of the sizing ring is provided with an electromagnetic induction device;

[0062] A water scraper is provided between the cooling device and the electromagnetic induction device.

[0063] The top of the hot-top crystallizer 3 is provided with a casting distribution plate 2; the bottom outlet of the sizing ring is provided with a spool head 11;

[0064] The graphite liner 4 is independently connected to the compressed air machine 5 and the release oil tank 7 through a conveying pipe that penetrates the insulation layer; the release oil tank 7 is used to supply release oil to the graphite liner 4; the graphite liner 4 has a thickness of 8mm and a height of 10mm.

[0065] The cooling device includes a cooling water tank 6; the cooling water tank 6 has an opening on the side near the inner wall of the guide layer.

[0066] The squeegee device includes a baffle plate and a squeegee 8; the two ends of the baffle plate are fixedly installed at the bottom of the guide layer and the outer wall of the sizing ring, respectively; the squeegee 8 is installed at one end close to the outer wall of the sizing ring.

[0067] The electromagnetic induction device is an electromagnetic induction coil 10 wound around the outer wall of a sizing ring; the electromagnetic induction coil 10 is electrically connected to the power supply 9 via a wire; the winding width of the electromagnetic induction coil 10 is 130mm.

[0068] Example 2

[0069] This embodiment provides a semi-continuous casting device system coupled with electromagnetic induction. The only difference between this device system and Embodiment 1 is that:

[0070] The air compressor is omitted in this embodiment.

[0071] Example 3

[0072] This embodiment provides a semi-continuous casting device system coupled with electromagnetic induction. The only difference between this device system and Embodiment 1 is that:

[0073] This embodiment omits the wiper blade.

[0074] Comparative Example 1

[0075] This comparative example provides a semi-continuous casting apparatus system coupled with electromagnetic induction. The only difference between this apparatus system and Example 1 is that:

[0076] This comparative example omits the inclusion of the electromagnetic induction device.

[0077] Comparative Example 2

[0078] This comparative example provides a semi-continuous casting apparatus system coupled with electromagnetic induction. The only difference between this apparatus system and Example 1 is that:

[0079] The graphite liner is omitted in this comparative example.

[0080] Application Example 1

[0081] This application example provides a semi-continuous casting method for aluminum alloys. The semi-continuous casting method for aluminum alloys uses the electromagnetic induction coupled semi-continuous casting device system provided in Example 1. The semi-continuous casting method for aluminum alloys includes the following steps:

[0082] (1) Turn on the cooling device and introduce cooling water, and at the same time turn on the compressed air machine so that a layer of release oil adheres to the surface of the graphite liner;

[0083] The cooling water has a flow rate of 450 L / min and a temperature of 20 °C.

[0084] (2) The molten aluminum alloy liquid at a temperature of 690°C after refining is injected into the hot top crystallizer through the casting distribution plate. When it passes through the graphite liner, it is cooled to form a solidified shell and then pulled to the guide layer by the ingot head for semi-continuous casting (cooling water treatment) to obtain the ingot.

[0085] The casting speed of the semi-continuous casting is 100 mm / min;

[0086] (3) After the ingot in step (2) is separated from the guide layer, the scraping device is started to remove the excess cooling water, and at the same time the electromagnetic induction device is started to perform electromagnetic heating.

[0087] The electromagnetic heating frequency is 15kHz, and the power density is 0.45W / cm². 2 .

[0088] Application Example 2

[0089] This application example provides a semi-continuous casting method for aluminum alloys. The semi-continuous casting method for aluminum alloys uses the electromagnetic induction coupled semi-continuous casting device system provided in Example 1. The semi-continuous casting method for aluminum alloys includes the following steps:

[0090] (1) Turn on the cooling device and introduce cooling water, and at the same time turn on the compressed air machine so that a layer of release oil adheres to the surface of the graphite liner;

[0091] The cooling water has a flow rate of 200 L / min and a temperature of 10 °C.

[0092] (2) The molten aluminum alloy liquid at a temperature of 670°C after refining is injected into the hot top crystallizer through the casting distribution plate. When it passes through the graphite liner, it is cooled to form a solidified shell and then pulled to the guide layer by the ingot head for semi-continuous casting (cooling water treatment) to obtain the ingot.

[0093] The casting speed of the semi-continuous casting is 70 mm / min;

[0094] (3) After the ingot in step (2) is separated from the guide layer, the scraping device is started to remove the excess cooling water, and at the same time the electromagnetic induction device is started to perform electromagnetic heating.

[0095] The electromagnetic heating frequency is 20kHz, and the power density is 0.6W / cm². 2 .

[0096] Application Example 3

[0097] This application example provides a semi-continuous casting method for aluminum alloys. The semi-continuous casting method for aluminum alloys uses the electromagnetic induction coupled semi-continuous casting device system provided in Example 1. The semi-continuous casting method for aluminum alloys includes the following steps:

[0098] (1) Turn on the cooling device and introduce cooling water, and at the same time turn on the compressed air machine so that a layer of release oil adheres to the surface of the graphite liner;

[0099] The cooling water has a flow rate of 700 L / min and a temperature of 30 °C.

[0100] (2) The molten aluminum alloy liquid with a temperature of 710°C after refining is injected into the hot top crystallizer through the casting distribution plate. When it passes through the graphite liner, it is cooled to form a solidified shell and then pulled to the guide layer by the ingot head for semi-continuous casting (cooling water treatment) to obtain the ingot.

[0101] The casting speed of the semi-continuous casting is 130 mm / min;

[0102] (3) After the ingot in step (2) is separated from the guide layer, the scraping device is started to remove the excess cooling water, and at the same time the electromagnetic induction device is started to perform electromagnetic heating.

[0103] The electromagnetic heating frequency is 10kHz, and the power density is 0.3W / cm². 2 .

[0104] A comprehensive analysis of Application Examples 1-3 shows that the semi-continuous casting process of aluminum alloys using the device system provided by this invention proceeded smoothly, and no cracking occurred in the ingots, fully demonstrating that the device system and method provided by this invention can effectively suppress ingot cracking.

[0105] Application Example 4

[0106] This application example provides a semi-continuous casting method for aluminum alloys. The semi-continuous casting method uses the electromagnetic induction coupled semi-continuous casting apparatus system provided in Example 1. The only difference between this semi-continuous casting method and Application Example 1 is that:

[0107] In this application example, the temperature of the molten aluminum alloy liquid in step (2) is adjusted to 650°C.

[0108] Application Example 5

[0109] This application example provides a semi-continuous casting method for aluminum alloys. The semi-continuous casting method uses the electromagnetic induction coupled semi-continuous casting apparatus system provided in Example 1. The only difference between this semi-continuous casting method and Application Example 1 is that:

[0110] In this application example, the temperature of the molten aluminum alloy liquid in step (2) is adjusted to 750°C.

[0111] A comprehensive analysis of Application Examples 1 and 4-5 reveals that the injection temperature of the molten aluminum alloy is one of the factors affecting the casting effect. If the injection temperature of the molten aluminum alloy is too high, it will not only cause the temperature of the ingot core to be too high, resulting in coarse grains and affecting the quality of the ingot, but also increase the temperature difference between the ingot surface and the core, making the ingot more prone to cracking. If the temperature is too low, it will not only shorten the solidification time of the ingot, making it easy to form a thick solidified shell within the graphite ring range, leading to increased friction and cracking, but also reduce the fluidity of the aluminum liquid, making it easier to form defects such as shrinkage cavities during solidification.

[0112] Application Example 6

[0113] This application example provides a semi-continuous casting method for aluminum alloys. The semi-continuous casting method uses the electromagnetic induction coupled semi-continuous casting apparatus system provided in Example 1. The only difference between this semi-continuous casting method and Application Example 1 is that:

[0114] In this application example, the frequency of the electromagnetic heating in step (3) is adjusted to 5 kHz, and the power density is adjusted to 1.0 W / cm². 2 .

[0115] Application Example 7

[0116] This application example provides a semi-continuous casting method for aluminum alloys. The semi-continuous casting method uses the electromagnetic induction coupled semi-continuous casting apparatus system provided in Example 1. The only difference between this semi-continuous casting method and Application Example 1 is that:

[0117] In this application example, the frequency of the electromagnetic heating in step (3) is adjusted to 25 kHz, and the power density is adjusted to 0.2 W / cm². 2 .

[0118] Compared to Application Example 1, the electromagnetic heating parameters in Application Examples 6-7 are either too high or too low during the casting process. If the method provided in Application Example 6 is used, the energy originally used to heat the surface and subsurface of the ingot will be concentrated more rapidly in the core of the ingot, generating greater internal stress and causing more serious ingot cracking problems. If the method provided in Application Example 7 is used, the electromagnetic heating energy will not be able to act on the subsurface, and the heating rate will be slower, making it impossible to eliminate casting internal stress.

[0119] Application Example 8

[0120] This application example provides a semi-continuous casting method for aluminum alloys. The semi-continuous casting method for aluminum alloys is carried out using the electromagnetic induction coupled semi-continuous casting device system provided in Example 2. The semi-continuous casting method for aluminum alloys is the same as that in Application Example 1.

[0121] Compared to Application Example 1, the casting method provided in Application Example 8 cannot provide release oil and pressure for the graphite liner, making it difficult to demold the ingot, resulting in severe scratches, cracks and cold shuts, causing serious quality problems.

[0122] Application Example 9

[0123] This application example provides a semi-continuous casting method for aluminum alloys. The semi-continuous casting method for aluminum alloys is carried out using the electromagnetic induction coupled semi-continuous casting device system provided in Example 3. The semi-continuous casting method for aluminum alloys is the same as that in Application Example 1.

[0124] Compared to Application Example 1, in the casting method provided by Application Example 9, excess cooling water cannot be removed in time after the ingot is formed, causing the excess cooling water to quickly carry away the heat from the surface of the ingot, resulting in a weak electromagnetic induction heating effect.

[0125] Comparative Application Example 1

[0126] This comparative application example provides a semi-continuous casting method for aluminum alloys. The semi-continuous casting method uses the electromagnetic induction coupled semi-continuous casting apparatus system provided in Comparative Example 1. The only difference between this semi-continuous casting method and Application Example 1 is that:

[0127] This comparative application example omits the electromagnetic heating process described in step (3).

[0128] Compared to Application Example 1, the omission of electromagnetic heating after ingot formation in this comparative application example increases the tendency of the ingot to crack due to internal stress.

[0129] Comparative Application Example 2

[0130] This comparative application example provides a semi-continuous casting method for aluminum alloys, which is carried out using the coupled electromagnetic induction semi-continuous casting device system provided in Comparative Example 2. The semi-continuous casting method for aluminum alloys is the same as that in Application Example 1.

[0131] Compared to Application Example 1, when the graphite liner is omitted in this comparative application example, serious quality problems such as scratches, cracks and cold shuts will appear on the surface of the ingot. When the temperature of the molten aluminum is high, serious safety accidents such as aluminum leakage may occur.

[0132] In summary, this invention can reduce the temperature difference between the surface and interior of aluminum alloy ingots during the casting process by coupling a hot-top crystallizer and an electromagnetic induction device, thereby reducing casting stress and eliminating casting cracks.

[0133] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A semi-continuous casting device system coupled with electromagnetic induction, characterized in that, The device system includes a hot-top crystallizer; According to the flow direction of the molten alloy liquid, the hot top crystallizer includes a heat insulation layer and a flow guiding layer that are fixedly connected in sequence; the inner wall of the heat insulation layer is inlaid with a graphite liner; and a cooling device is provided in the flow guiding layer; The bottom outlet of the flow guide layer is provided with a sizing ring; the outer wall of the sizing ring is provided with an electromagnetic induction device; A water scraper is provided between the cooling device and the electromagnetic induction device.

2. The device system according to claim 1, characterized in that, The top of the hot-top crystallizer is provided with a casting distribution plate; Preferably, the bottom outlet of the sizing ring is provided with a spindle head.

3. The device system according to claim 1 or 2, characterized in that, The graphite liner is independently connected to the compressed air machine and the demolding oil tank through a conveying pipe that penetrates the insulation layer. Preferably, the release oil groove is used to supply release oil to the graphite liner; Preferably, the graphite liner has a thickness of 5-10 mm and a height of 10-25 mm.

4. The apparatus system according to any one of claims 1-3, characterized in that, The cooling device includes a cooling water tank; Preferably, the cooling water tank has an opening on the side near the inner wall of the guide layer.

5. The apparatus system according to any one of claims 1-4, characterized in that, The wiping device includes a baffle and a wiping blade; Preferably, the two ends of the baffle plate are fixedly installed at the bottom of the flow guiding layer and the outer wall of the sizing ring, respectively; Preferably, the wiper blade is installed at one end near the outer wall of the sizing ring.

6. The apparatus system according to any one of claims 1-5, characterized in that, The electromagnetic induction device is an electromagnetic induction coil wound around the outer wall of the sizing ring; Preferably, the electromagnetic induction coil is electrically connected to a power source via a wire; Preferably, the winding width of the electromagnetic induction coil is 100~170mm.

7. A method for semi-continuous casting of aluminum alloys using the apparatus system described in any one of claims 1-6, characterized in that, The casting method includes: The cooling device is turned on, and then the molten alloy liquid is injected into the hot top crystallizer for semi-continuous casting to obtain an ingot; Once the ingot is separated from the guide layer, the scraping device and electromagnetic induction device are activated for electromagnetic heating.

8. The semi-continuous casting method for aluminum alloys according to claim 7, characterized in that, The process of activating the cooling device also includes activating the compressed air compressor. Preferably, the cooling device includes the introduction of cooling water; Preferably, the flow rate of the cooling water is 200~700 L / min; Preferably, the temperature of the cooling water is 10~30℃.

9. The semi-continuous casting method for aluminum alloys according to claim 7 or 8, characterized in that, The temperature of the molten alloy liquid is 670~710℃; Preferably, the casting speed of the semi-continuous casting is 70~130mm / min.

10. The semi-continuous casting method for aluminum alloys according to any one of claims 7-9, characterized in that, The frequency of the electromagnetic heating is 10~20kHz; Preferably, the power density of the electromagnetic heating is 0.3~0.6 W / cm². 2 .

Images