Magnesium-lithium alloy continuous casting device

Abstract

The present invention relates to a magnesium-lithium alloy continuous casting apparatus, and more specifically, to a magnesium-lithium alloy continuous casting apparatus that enables melting and casting of a magnesium-lithium alloy in an atmospheric state, thereby minimizing casting equipment costs and increasing alloy production yield by minimizing alloy loss, and can maximize cooling efficiency by performing tertiary cooling and homogenize alloy components to minimize defect rates.

Description

Technology Field

[0001] The present invention relates to a magnesium-lithium alloy continuous casting apparatus, and more specifically, to a magnesium-lithium alloy continuous casting apparatus that enables the melting and casting of magnesium-lithium alloys in an atmospheric state, thereby minimizing facility construction and operation costs, while simultaneously increasing alloy production volume by minimizing alloy loss, and can maximize cooling efficiency by performing three-stage cooling and homogenize alloy components to minimize defect rates. Background Technology

[0003] Generally, magnesium or magnesium alloys (hereinafter collectively referred to as magnesium alloys) are the lightest metals among practical metals and are expected to be lightweight structural materials due to their excellent specific strength and specific stiffness. Furthermore, they are expected to be substitutes for resin-based materials as well as metal materials such as iron-based and aluminum-based materials.

[0004] Recently, as the lightweighting of transportation equipment has become required, the demand for magnesium alloys—the lightest among practical metals—has increased. Furthermore, due to not only lightweighting but also excellent specific strength, the use of magnesium in automotive and IT components has grown, and the demand continues to increase.

[0005] Generally, magnesium alloy manufacturing involves adding alloying elements to molten magnesium contained in a mild steel crucible of a melting furnace to mix the desired composition of alloying elements, then melting the mixture, and through a stirring process, distributing the alloying elements uniformly within the molten magnesium to produce a high-temperature liquid magnesium alloy solution, i.e., a molten magnesium alloy.

[0006] Afterwards, the molten magnesium alloy produced is poured into a mold or the like and cooled to cast.

[0007] Meanwhile, during the process of supplying the molten magnesium alloy to the mold, if impurities such as non-metallic inclusions are mixed into the casting mold along with the molten magnesium alloy, there was a problem in that the quality of the magnesium alloy deteriorated and the defect rate increased.

[0008] In addition, conventional magnesium continuous casting had the problem that stable casting was difficult because the molten metal in the closed holding furnace was pressurized using gas or transferred to a tundish using a pump before being injected into the mold, and the gas used for pressurization or the conventional gas used to prevent ignition and oxidation caused environmental pollution.

[0009] Accordingly, recently, there have been attempts to continuously cast a magnesium alloy horizontally by cooling it in a tubular insulated mold and spraying a cooling liquid onto the surface. However, this method requires supplying a gas to prevent oxidation and ignition in the gaps between molds during continuous horizontal casting and requires separate control of the casting environment, which has limitations in terms of productivity.

[0010] In addition, molten magnesium and molten magnesium alloys are generally cast in a vacuum or inert atmosphere because the introduction of air increases the risk of ignition and oxidation. However, this resulted in high equipment installation costs and significant losses, leading to reduced productivity.

[0011] In particular, sulfur hexafluoride, carbon dioxide, and sulfur dioxide are primarily used as gases for controlling inert atmospheres, and their use is restricted due to their environmental and human health hazards.

[0012] Therefore, there is a need for technology that can prevent impurities from entering the molten magnesium alloy during magnesium alloy casting, enable continuous casting to reduce production costs and improve productivity, and promote an eco-friendly process by replacing gases that cause environmental pollution with eco-friendly gases. The problem to be solved

[0014] The present invention was devised to solve the aforementioned problems, and the objective of the present invention is to provide a magnesium-lithium alloy continuous casting apparatus that seals the molten magnesium and molten magnesium alloy so that impurities are not mixed in, and improves the structure of the equipment so that the molten magnesium does not come into contact with air, thereby enabling the melting and casting of magnesium alloys in the atmosphere and allowing the process to be performed in an environmentally friendly manner by not using gases that cause environmental pollution. means of solving the problem

[0015] To achieve the above-mentioned purpose, a magnesium-lithium alloy continuous casting apparatus is provided, characterized by comprising: a melting furnace for melting magnesium and then adding a certain weight percent of alloying elements to the molten magnesium, stirring, and melting; a holding furnace for stabilizing the molten magnesium alloy transferred from the melting furnace while maintaining it at a preset temperature; a cooling tank for cooling the molten magnesium stabilized in the holding furnace into a certain shape; and a transfer means for transferring the molten magnesium from the melting furnace to the holding furnace and from the holding furnace to the cooling tank while maintaining a state in which air is blocked.

[0016] In a preferred embodiment, the melting furnace comprises: a melting tank having a space to accommodate the magnesium and the alloy element and melting the magnesium and the alloy element; a stirring means provided inside the melting tank to stir the molten magnesium and the molten magnesium alloy; a sealing means formed with a double opening / closing structure on the upper part of the melting tank to seal the melting tank so that foreign substances and air can be blocked from entering the melting tank; a bubbling means supplying argon gas to the molten magnesium alloy contained in the melting tank to bubble in order to equalize the composition and temperature of the molten magnesium alloy and to capture and remove impurities within the molten metal; an input means in which the alloy element is contained inside a box-shaped structure made of a mesh net and is introduced into the molten magnesium molten in the melting tank by repeatedly performing an up-and-down movement so that the alloy element is melted into the molten magnesium; and a temperature sensor for measuring the temperature of the molten magnesium and the molten magnesium alloy.

[0017] In a preferred embodiment, the temperature of the melting furnace and the holding furnace is maintained at 580°C to 600°C.

[0018] In a preferred embodiment, the cooling tank is configured to perform three-stage cooling, and the three-stage cooling comprises: a first cooling step in which cooling water is sprayed onto the outer surface of a first cooling structure into which the molten magnesium alloy moves; a second cooling step in which cooling water is sprayed onto the outer surface of a second cooling structure into which the molten magnesium alloy (hereinafter referred to as 'solidified magnesium alloy') solidified by the first cooling step moves at a predetermined distance from the inner surface; and a third cooling step in which cooling gas is supplied to the space between the second cooling structure and the solidified magnesium alloy while the solidified magnesium alloy moves inside the second cooling structure.

[0019] In a preferred embodiment, the cooling gas is liquefied argon.

[0020] In a preferred embodiment, the transfer means comprises: a transfer pipe connecting the melting furnace, the holding furnace, and the holding furnace to the cooling tank, blocking the inflow of air, and providing a transfer path for the molten magnesium alloy; and a pump that receives power and pumps to transfer the molten magnesium alloy from the melting furnace to the holding furnace and transfer the molten magnesium alloy from the holding furnace to the cooling tank. Effects of the invention

[0022] The present invention has the following excellent effects.

[0023] According to the magnesium-lithium alloy continuous casting apparatus of the present invention, the magnesium alloy casting facility is equipped with a melting furnace, a holding furnace, and a cooling tank, which can block the inflow of air and impurities into the transfer pipe that transports the molten magnesium alloy. Furthermore, by double-sealing the melting furnace to block the inflow of air and impurities into the melting tank, melting and casting can be performed while ensuring stability even in the atmosphere, thus having the advantage of improving productivity with minimal equipment costs.

[0024] In addition, the magnesium-lithium alloy continuous casting apparatus of the present invention has the advantage of maximizing cooling efficiency by having a structure that can cool the molten magnesium alloy transferred from the holding furnace in three stages, including first (cooling water injection), second (cooling water injection), and third (cooling gas injection), thereby improving the quality of the magnesium alloy and increasing production volume.

[0025] In addition, according to the magnesium-lithium alloy continuous casting apparatus of the present invention, the process is carried out in an environmentally friendly manner and has the advantage of high stability by using argon gas and liquefied argon instead of gases that cause environmental pollution for the gas bubbling in the melting furnace and the cooling gas injected from the cooling tank.

[0026] In addition, according to the magnesium-lithium alloy continuous casting apparatus of the present invention, the melting furnace is formed with a double-sealed structure, so when performing intermediate processes such as adding alloying elements to the molten magnesium in the melting furnace or checking the temperature, there is an advantage of minimizing the inflow of air into the melting furnace. Brief explanation of the drawing

[0028] FIG. 1 is a conceptual diagram illustrating the configuration of a magnesium-lithium alloy continuous casting apparatus according to one embodiment of the present invention, FIG. 2 is a drawing for explaining a melting furnace of a magnesium-lithium alloy continuous casting apparatus according to an embodiment of the present invention, FIG. 3 is a drawing for explaining a cooling tank of a magnesium-lithium alloy continuous casting apparatus according to one embodiment of the present invention. Specific details for implementing the invention

[0029] The terms used in this invention have been selected to be as widely used as possible; however, in specific cases, terms have been arbitrarily selected by the applicant. In such cases, the meaning should be understood by considering the meaning described or used in the detailed description of the invention, rather than merely the name of the term.

[0030] Hereinafter, the technical configuration of the present invention will be described in detail with reference to preferred embodiments illustrated in the attached drawings.

[0031] However, the present invention is not limited to the embodiments described herein and may be embodied in other forms, and the same reference numerals throughout the specification indicate the same components.

[0032] FIG. 1 is a conceptual diagram illustrating the configuration of a magnesium-lithium alloy continuous casting apparatus according to one embodiment of the present invention.

[0033] Referring to FIG. 1, the magnesium-lithium alloy continuous casting apparatus (100) of the present invention is a magnesium alloy continuous casting apparatus that enables the melting and casting of a magnesium alloy in the atmosphere, is formed with a double opening and closing structure to block foreign substances or air, and is an environmentally friendly process that does not use gases that cause environmental pollution, and has improved equipment with a structure that minimizes loss and improves alloy quality.

[0034] Meanwhile, the present invention is a device for continuously casting a magnesium-lithium alloy among magnesium alloys, and has the advantage of being able to improve the lightweighting effect and simultaneously improve the alloy formability by adding a lithium element to magnesium.

[0035] In addition, the magnesium-lithium alloy continuous casting apparatus (100) of the present invention comprises a melting furnace (110), a holding furnace (120), a cooling tank (130), and a conveying means (140).

[0036] FIG. 2 is a drawing illustrating a melting furnace of a magnesium-lithium alloy continuous casting apparatus according to one embodiment of the present invention.

[0037] Referring to FIG. 2, the melting furnace (110) heats and melts magnesium elements and alloy elements, and stirs the molten magnesium alloy to evenly distribute the alloy elements.

[0038] Here, the alloy elements include, in addition to lithium (Li) which improves lightness and formability as described above, aluminum (Al), zinc (Zn) which improves mechanical properties, and calcium (Ca) and yttrium (Y) which prevent magnesium ignition and oxidation.

[0039] In addition, the melting furnace (110) comprises a melting tank (111), a stirring means (112), a sealing means (113), a bubbling means (114), an input means (115), and a temperature sensor (116).

[0040] In addition, the melting furnace (110) heats the molten magnesium alloy so that the temperature is maintained at approximately 580°C, and controls the temperature so that it does not exceed the range between 580°C and 600°C.

[0041] The melting tank (111) is configured such that the magnesium element and the alloy element are introduced, the magnesium element and the alloy element are melted by heating, and the molten magnesium alloy can be received.

[0042] In addition, although the melting tank (111) is shown in a cylindrical shape in FIG. 2, it is not limited thereto, and it is preferable to form it in a shape that allows the alloy elements contained in the molten magnesium alloy to be effectively evenly distributed or to be effectively melted.

[0043] The stirring means (112) is provided inside the melting tank (111) and is a means for stirring the molten magnesium alloy contained in the melting tank (111).

[0044] In detail, the stirring means (112) is provided with a plurality of stirring blades (112-1) radially on the central axis of the melting tank (111), and rotates around the central axis. The stirring blades (112-1) are formed with a length that is spaced apart from the bottom surface and inner surface of the melting tank (111) by a predetermined distance, thereby stirring to ensure that alloy elements are evenly mixed without accumulating or settling on the inner surface of the melting tank (111) and thus achieve a uniform composition ratio.

[0045] Accordingly, the magnesium alloy cast with the molten magnesium alloy stirred by the stirring means (112) can have the alloy elements evenly distributed, thereby improving the quality of the magnesium alloy.

[0046] Meanwhile, although the stirring blade (112-1) is shown in FIG. 2 as being formed in a cylindrical shape, it is not limited thereto, and it is preferable to form it in a shape that allows the magnesium alloy molten metal to be mixed efficiently and the entire molten metal to be stirred evenly without settling in any one area.

[0047] In addition, the stirring blade (112-1) is not limited to that shown in FIG. 2, and the position and number of the stirring blade (112-1) are preferably formed in such a way that the molten magnesium alloy can be efficiently mixed.

[0048] In addition, in the present invention, the stirring means (112) stirs three times at 30-minute intervals, but the operator may control it arbitrarily depending on the state of the molten magnesium alloy.

[0049] The sealing means (113) seals the upper part of the melting tank (111) so that foreign substances and air can be blocked from the molten magnesium and molten magnesium alloy contained in the melting tank (111).

[0050] In addition, the sealing means (113) is a double sealing structure and comprises an inner sealing means (113-1) and an outer sealing means (113-2).

[0051] In addition, the sealing means (113) seals the open upper part of the melting tank (111), and when the operator adds the alloy element, checks the temperature, or cleans impurities during the melting of the magnesium molten metal, only the outer sealing means (113-2) is opened and then sealed after intermediate processing, which has the advantage of minimizing or preventing external air from entering the melting tank (111).

[0052] Furthermore, even if the inner sealing means (113-1) is not perfectly sealed, it is double-blocked by the outer sealing means (113-2), and the space between the inner sealing means (113-1) and the outer sealing means (113-2) can be filled with argon (Ar) gas to completely block the inflow of air from the atmosphere, which is an advantage.

[0053] The bubbling means (114) is a means for bubbling by supplying gas to the molten magnesium alloy contained in the melting tank (111) to equalize the composition and temperature of the molten magnesium alloy and to capture and remove impurities in the molten metal. It has the advantage of removing impurities by supplying gas to the molten magnesium alloy while preventing precipitates or foreign substances of the molten magnesium alloy from adhering to the inner surface of the melting tank (111).

[0054] In addition, the bubbling means (114) may be provided in the stirring means (112) to supply gas to the molten magnesium alloy, and in addition, as shown in FIG. 2, a separate long cylindrical bubbling configuration (114-1) may be provided inside the melting furnace (110) to increase the bubbling effect.

[0055] Here, the gas used by the bubbling means (114) is argon (Ar) gas, but is not limited thereto. Various gases can be used to help to melt the magnesium molten metal and magnesium alloy molten metal stably and effectively without causing environmental pollution and without reacting with the magnesium molten metal and magnesium alloy molten metal, thereby preventing ignition and oxidation.

[0056] The above-mentioned input means (115) is a means for introducing the alloy element into the molten magnesium contained in the melting tank (111). In the present invention, after the magnesium element is first melted in the melting tank (111), the alloy element is introduced when the stirring means (112) is operated so that the alloy element is uniformly mixed and melted in the molten magnesium.

[0057] In detail, the above-mentioned input means (115) is provided with a case (115-1) capable of accommodating the alloy element, and the case (115-1) is made of a mesh material, and the alloy element is placed inside the case (115-1), and the case (115-1) containing the alloy element is introduced into the molten magnesium to introduce the molten alloy element into the molten magnesium.

[0058] At this time, the above-mentioned input means (115) can improve the quality of the cast alloy by reciprocating the case (115-1) containing the alloy element in the above-mentioned magnesium molten metal up and down so that the alloy element melted by the above-mentioned magnesium molten metal can be evenly distributed.

[0059] In addition, the above-mentioned input means (115) is introduced while the molten magnesium is being melted and stirred so that it can be evenly stirred with the molten magnesium.

[0060] The temperature sensor (116) is a means for measuring the temperature of the molten magnesium and molten magnesium alloy, and although it is shown as being provided in the sealing means (113), it can be checked manually by the operator or provided inside the melting tank (111).

[0061] The above-mentioned holding furnace (120) stabilizes the molten magnesium alloy transferred from the above-mentioned melting furnace (110) while maintaining it at a preset temperature.

[0062] In detail, when the molten magnesium alloy from the melting furnace (110) is transferred, the holding furnace (120) maintains the molten magnesium alloy at a temperature of 580°C to 600°C, precipitates the material to be precipitated, and stabilizes the molten magnesium alloy.

[0063] Meanwhile, if the temperature of the molten magnesium alloy drops below 580°C, it becomes slightly solidified, causing a problem where the conveying impeller does not rotate, and if the temperature of the molten magnesium alloy rises above 600°C, there is a problem where the molten magnesium alloy is not cooled in the cooling tank (130), so maintaining the temperature in the holding furnace (120) is important.

[0064] In addition, this process has the advantage of stabilizing the unstable molten magnesium alloy to improve the quality of the cast magnesium alloy.

[0065] FIG. 3 is a drawing for explaining a cooling tank of a magnesium-lithium alloy continuous casting apparatus according to one embodiment of the present invention.

[0066] Referring to FIG. 3, the cooling tank (130) is a means for cooling the magnesium alloy molten metal (1) stabilized in the heat retention furnace (120) into a certain shape, and more specifically, the magnesium alloy molten metal (1) flowing into the cooling tank (130) is cooled in three stages.

[0067] In addition, the cooling tank (130) is formed in a cylindrical shape with openings formed at the top and bottom, and the molten magnesium alloy (1) flowing into the upper opening of the cooling tank (130) is cooled into a certain shape, and the cast magnesium alloy is discharged through the lower opening of the cooling tank (130).

[0068] Additionally, the cooling tank (130) is composed of cooling structures (131, 132), and the cooling structures (131, 132) are composed of a first cooling structure (131) formed with a diameter equal to the diameter of the billet to be cast and a second cooling structure (132) formed with a diameter that is larger than the first cooling structure (131) by a predetermined amount, and the second cooling structure (132) is formed as an integral structure by extending from the lower end of the first cooling structure (131).

[0069] In detail, the first cooling structure (131) is formed with a height of about 200 mm from the upper opening of the cooling tank (130), and the second cooling structure (132) is formed with a height of about 500 mm from the lower end of the first cooling structure (131) to the lower opening of the cooling tank, but is not limited thereto and can be changed to various lengths to maximize cooling efficiency.

[0070] Meanwhile, the cooling tank (130) is cooled in a total of three stages. In the first stage of cooling, when the molten magnesium alloy (1) flows in from the upper opening of the cooling tank (130), cooling water (3) is sprayed onto the outer surface of the first cooling structure (131) to cool the molten magnesium alloy (1) in the first stage.

[0071] Next, for secondary cooling, when the magnesium alloy molten metal (hereinafter referred to as 'magnesium alloy solidified solid') solidified by the first cooling flows into the interior of the second cooling structure (132), cooling water (3) is sprayed onto the outer surface of the second cooling structure (132) to cool the magnesium alloy solidified solid (1) in a second step.

[0072] Next, the third cooling is performed by supplying a cooling gas (3) to the space between the magnesium alloy solidified solid (1) and the second cooling structure (132) while the magnesium alloy solidified solid (1) moves from inside the second cooling structure (132) toward the lower opening of the cooling tank (130), thereby cooling the magnesium alloy solidified solid (1) in the third step.

[0073] Here, the cooling tank (130) has a cooling supply means (133) that supplies the cooling gas (3) in the third cooling step located at the lower opening of the cooling tank (130) to supply the cooling gas (3) toward the upper part of the second cooling structure (132) in the space between the magnesium solidified solid (1) and the second cooling structure (132).

[0074] The above cooling supply means (133) is located at the lower end of the second cooling structure (130) in a ring shape, and a hole through which the cooling gas (3) is discharged is provided on the upper surface of the cooling supply means (133) so as to supply the cooling gas (3) toward the upper end of the second cooling structure (132) in the space between the second cooling structures (132) to directly cool the magnesium alloy solidified solid (1).

[0075] Here, in the present invention, liquefied argon, which is environmentally friendly and highly stable, was used as the cooling gas, but it is not limited thereto, and a cooling gas that is environmentally friendly, has low reactivity with magnesium, and is highly stable can be used.

[0076] Accordingly, the cooling tank (130) can maximize cooling efficiency by cooling the molten magnesium alloy (1) in three stages, thereby improving the quality of the magnesium alloy, and can also improve productivity by rapidly casting the magnesium alloy through three-stage cooling.

[0077] The above-mentioned conveying means (140) is a means for conveying the above-mentioned molten magnesium alloy (1), and more specifically, conveys the above-mentioned molten magnesium alloy (1) from the above-mentioned melting furnace (110) to the above-mentioned holding furnace (120), and from the above-mentioned holding furnace (120) to the above-mentioned cooling tank (130) while air is blocked.

[0078] In addition, the above-mentioned transfer means (140) comprises a transfer pipe (141) and a pump (142).

[0079] The above transfer pipe (141) is a transfer path for the magnesium alloy molten metal (1), and is installed to block the inflow of air from the outside, to connect the magnesium alloy molten metal (1) contained in the melting furnace (110) with the holding furnace (120), and to connect the magnesium alloy molten metal (1) contained in the holding furnace (120) with the cooling tank (130).

[0080] The above pump (142) is a means for transporting the magnesium alloy molten metal (1), pumping the magnesium alloy molten metal (1) contained in the melting furnace (110) to the holding furnace (120), and pumping the magnesium alloy molten metal (1) contained in the holding furnace to the cooling tank (130).

[0081] Accordingly, the conveying means (140) can control the conveying speed of the magnesium alloy molten metal (1) by adjusting the diameter of the conveying pipe (141) and the pumping degree of the magnesium alloy molten metal (1).

[0082] Meanwhile, the present invention may further provide a discharge container (150) capable of receiving the magnesium alloy that is discharged when the magnesium alloy, which is cooled and cast from the cooling tank (130), is discharged through the lower opening of the cooling tank (130).

[0083] In the present invention, the discharge container (150) is shown as receiving the discharged magnesium alloy, but in addition to this, it can be provided as a system capable of continuously processing the cast magnesium alloy by connecting it to a separate processing means.

[0084] Accordingly, the magnesium-lithium alloy continuous casting apparatus (100) of the present invention can block the inflow of air while the process of melting and cooling the molten magnesium and molten magnesium alloy is carried out in the melting furnace (110), the holding furnace (120), and the cooling tank (130), which are components of the magnesium alloy casting facility, thereby ensuring stability even in an atmospheric state rather than a vacuum, and can perform continuous casting. Furthermore, since it is formed with a double sealed structure that blocks the inflow of impurities from the outside, it has the effect of improving the quality of the magnesium alloy, improving productivity, and reducing equipment costs.

[0085] As described above, the present invention has been illustrated and explained with reference to preferred embodiments, but it is not limited to the aforementioned embodiments, and various changes and modifications may be made by those skilled in the art within the scope of the invention without departing from the spirit of the invention. Explanation of the symbols

[0086] 1: Molten magnesium alloy 2: Cooling water 3: Cooling gas 100: Magnesium-lithium alloy continuous casting device 110: Melting furnace 111: Melting tank 112: Stirring means 113: Sealing means 113-1 : Inner sealing means 113-2 : Outer sealing means 114 : Bubbling means 114-1 : Bubbling composition 115 : Input means 115-1 : Case 116 : Temperature sensor 120 : Keeping furnace 130 : Cooling tank 131 : First cooling structure 132: Second cooling structure 133: Cooling gas supply means 140 : Means of transfer 141 : Transfer pipe 142 : Pump 150 : Discharge container

Claims

Claim 1 A melting furnace for melting magnesium, adding a certain weight percent of alloying elements to the melted magnesium, stirring, and melting; a holding furnace for stabilizing the molten magnesium alloy transferred from the melting furnace while maintaining it at a preset temperature; and a cooling tank for cooling the molten magnesium stabilized in the holding furnace into a specific shape. and a transfer means for transferring the molten metal from the melting furnace to the holding furnace, and from the holding furnace to the cooling tank while maintaining a state where air is blocked; wherein the melting furnace comprises: a melting tank having a space to accommodate the magnesium and the alloy element and melting the magnesium and the alloy element; a stirring means provided inside the melting tank for stirring the molten magnesium alloy; a sealing means formed with a double opening / closing structure on the upper part of the melting tank to seal the melting tank so that foreign substances and air can be blocked from the molten magnesium alloy contained in the melting tank; a bubbling means for bubbling by supplying argon gas to the molten magnesium alloy contained in the melting tank to equalize the composition and temperature of the molten magnesium alloy and to capture and remove impurities within the molten metal; and an input means in which the alloy element is accommodated inside a box-shaped structure made of a mesh net and is introduced into the molten magnesium molten in the melting tank by repeatedly performing an up-and-down movement so that the alloy element melts into the molten magnesium molten metal. A magnesium-lithium alloy continuous casting apparatus characterized by including a temperature sensor for measuring the temperature of the molten magnesium and the molten magnesium alloy. Claim 2 delete Claim 3 A magnesium-lithium alloy continuous casting apparatus according to claim 1, characterized in that the temperatures of the melting furnace and the holding furnace are maintained at 580℃ to 600℃. Claim 4 A magnesium-lithium alloy continuous casting apparatus according to claim 1, wherein the cooling tank is configured to perform three-stage cooling, and the three-stage cooling comprises: a first cooling step in which cooling water is sprayed onto the outer surface of a first cooling structure through which the molten magnesium alloy moves; a second cooling step in which cooling water is sprayed onto the outer surface of a second cooling structure through which the molten magnesium alloy (hereinafter referred to as 'solidified magnesium alloy') solidified by the first cooling step moves at a predetermined distance from the inner surface; and a third cooling step in which cooling gas is supplied to the space between the second cooling structure and the solidified magnesium alloy while the solidified magnesium alloy moves within the second cooling structure. Claim 5 A magnesium-lithium alloy continuous casting apparatus according to claim 4, characterized in that the cooling gas is liquefied argon. Claim 6 A magnesium-lithium alloy continuous casting apparatus according to claim 1, wherein the conveying means comprises: a conveying pipe connecting the melting furnace, the holding furnace, and the holding furnace to the cooling tank, blocking the inflow of air, and providing a conveying path for the molten magnesium alloy; and a pump that receives power and pumps to convey the molten magnesium alloy from the melting furnace to the holding furnace and to convey the molten magnesium alloy from the holding furnace to the cooling tank.

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