Liquid metal additive manufacturing device and method

Abstract

The present invention discloses a liquid metal additive manufacturing device and method, relating to the field of metallurgy. The device comprises a vacuum chamber, and a translation element, a mold element, a cooling element, a scanning heating element, and a fluidic element disposed within the vacuum chamber. The mold element is movably mounted on the translation element and is capable of reciprocating along the length of the translation element. The cooling element, the scanning heating element, and the fluidic element are all located above the translation element and arranged sequentially along the length of the translation element. The fluidic element is capable of injecting a melt into the mold element. The lower end of the cooling element is capable of extending into the mold element and cooling and pressing down the melt until the melt within the mold element solidifies to form an alloy ingot. The scanning heating element is capable of heating and melting the surface layer of the alloy ingot. The present invention increases the thickness of the alloy ingot while also preventing the formation of internal porosity defects.

Description

Technical Field

[0001] The present invention relates to the field of metallurgy technology, and in particular to a liquid metal additive manufacturing device and method. Background Art

[0002] The preparation of highly uniform metal ingots has always been a difficult problem in the industry. The reason is that during the solidification process of the alloy, changes in cooling conditions can easily lead to large structural differences. For example, the cooling rate at the edge of the ingot is relatively high, which easily forms a fine equiaxed crystal structure; the cooling rate at the center of the ingot is slower, which easily forms coarse grains. At the same time, for alloys with high alloy content, due to the segregation of the specific gravity of the alloying elements, or the segregation of the alloying elements in the liquid and solid phases, large macro-segregation problems are easily generated, that is, the chemical composition of the alloying elements at different positions in the alloy ingot is significantly different. Fluctuations in chemical composition can lead to significant differences in the mechanical properties of the alloy ingot at different positions, which needs to be avoided as much as possible in production. However, traditional metal ingot casting technologies, such as continuous casting or semi-continuous casting, are difficult to avoid the above problems.

[0003] Liquid metal additive manufacturing is an emerging metal material preparation technology. Because it utilizes the "discrete-deposition" principle and directly uses liquid metal as the additive feedstock, it improves preparation efficiency and is therefore an ideal method for producing highly uniform alloy ingots. However, conventional technologies have certain limitations. The condensation system is located at the bottom of the alloy ingot, and during the preparation process, the alloy liquid spreads over the top of the ingot. The latent heat of solidification released by this liquid during solidification must be transferred downward through the thickness of the ingot and removed by the condensation system. When the ingot thickness is small, the ingot's inherent thermal resistance is low. However, when the ingot thickness increases to a certain critical value, the ingot's inherent thermal resistance significantly impedes the transfer of the latent heat of solidification, resulting in a significant decrease in the cooling rate of the ingot's surface, which can lead to significant grain structure differences. Furthermore, as the ingot thickness increases, the temperature gradient from the surface to the bottom of the ingot decreases. For the alloy, this means that the spatial depth of the solid-liquid two-phase region at the liquid-solid interface increases, and the thickness of the mushy zone increases. This expansion of the solidification zone increases the risk of shrinkage defects. Summary of the Invention

[0004] The purpose of the present invention is to provide a liquid metal additive manufacturing device and method to solve the problems existing in the above-mentioned prior art, while increasing the thickness of the alloy ingot and avoiding the formation of internal loose defects.

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

[0006] The present invention provides a liquid metal additive manufacturing device, comprising:

[0007] Vacuum chamber;

[0008] a translation element, the translation element being placed in the vacuum chamber;

[0009] a mold element, the mold element being placed in the vacuum chamber and movably mounted on the translation element, the mold element being capable of reciprocating along the length direction of the translation element;

[0010] a fluidic element, the fluidic element being placed in the vacuum chamber and above the translation element, and capable of injecting melt into the mold element;

[0011] a cooling element, the cooling element being disposed in the vacuum chamber and above the translation element, the lower end of the cooling element being capable of extending into the mold element and cooling the pressed melt until the melt in the mold element solidifies to form an alloy ingot; and

[0012] a scanning heating element, the scanning heating element being placed in the vacuum chamber and above the translation element, and being capable of heating and melting the surface layer of the alloy ingot;

[0013] The cooling element, the scanning heating element and the jet element are arranged in sequence along the length direction of the translation element.

[0014] Preferably, the translation element includes a slide rail and a driving portion, and the driving portion is capable of causing the mold element to reciprocate along the length direction of the slide rail to a position below the jet element, below the cooling element, or below the scanning heating element.

[0015] Preferably, the mold element includes a mold body and a base plate, the lower end of the mold body is movably connected to the translation element, and the base plate is installed on the inner bottom surface of the mold body, and the mold body is used to form alloy ingots.

[0016] Preferably, the mold body is made of high-temperature resistant heat-insulating material.

[0017] Preferably, the jet element includes a crucible, a heater, a push rod type pressure head, a baffle and a plurality of nozzles, the crucible is used to store the melt, and the heater is installed on the outer periphery of the crucible, the nozzle is installed at the lower end of the crucible and is connected to the interior of the crucible, the push rod type pressure head is movably installed inside the crucible, and when the push rod type pressure head moves downward in the crucible, the melt in the crucible can be pushed out through the nozzle, the baffle is movably installed at the lower end of the nozzle, and the baffle can seal or open the nozzle.

[0018] Preferably, a plurality of the nozzles are arranged in an array on the lower bottom surface of the crucible.

[0019] Preferably, the cooling element is a water-cooled pressure head, a cooling channel is provided inside the water-cooled pressure head, both ends of the cooling channel can be connected to the outside world, and the cooling channel is used to pass cooling water.

[0020] Preferably, the scanning heating element is an array laser, and the multiple laser heads on the array laser are arranged linearly, and the arrangement direction of the multiple laser heads is parallel to the length direction of the translation element. The array laser can move back and forth along the width direction of the translation element and cover the entire upper surface of the alloy ingot in the mold element.

[0021] Preferably, the scanning heating element is located above the first station of the translation element, the jet element is located above the second station of the translation element, and the cooling element is located above the third station of the translation element.

[0022] The present invention also provides a liquid metal additive manufacturing method, using the liquid metal additive manufacturing device described in any one of the above technical solutions, comprising the following steps:

[0023] S1. The alloy melt to be prepared is refined and then injected into the crucible of the jet element. The nozzle of the jet element is blocked with a baffle, the heater of the jet element is turned on, and the temperature of the alloy melt is controlled to be above the solidification point and kept warm to form a melt;

[0024] S2. Turn on the cooling water and allow the cooling water to circulate within the cooling element. At the same time, evacuate the vacuum chamber and fill it with high-purity argon gas to atmospheric pressure.

[0025] S3. Move the mold element to the second station of the translation element, remove the baffle below the nozzle, and push the push rod head of the jet element downward, so that the melt forms an array of liquid columns through the nozzle under pressure and enters the mold element. When the thickness of the liquid layer in the mold element reaches the set thickness value θ1, stop pushing the push rod head and block the nozzle with the baffle;

[0026] S4. The mold element containing the melt is moved to the third station, the water-cooled pressure head is started and gently pressed down along the inner wall of the mold element. When the melt within the mold element is completely solidified to form an alloy ingot, the water-cooled pressure head is lifted;

[0027] S5. The mold element containing the alloy ingot is moved to the first station, the array laser is activated and the surface of the alloy ingot is scanned and heated horizontally to remelt the surface metal with a thickness of θ2, where θ2 < θ1, and then the array laser is turned off;

[0028] S6. Move the mold element back to the second station, remove the baffle below the nozzle, and push the push rod ram downward, so that the melt, under pressure, forms an array of liquid columns through the nozzle and enters the mold element. When the thickness of the liquid layer in the mold element reaches the set thickness value θ1 again, stop pushing the push rod ram and seal the nozzle with the baffle;

[0029] S7. Repeat S3-S6 multiple times to finally obtain an alloy ingot.

[0030] Compared with the prior art, the present invention has achieved the following technical effects:

[0031] The liquid metal additive manufacturing device and method provided by the present invention are characterized in that a mold element is movably mounted on a translation element, and the mold element can reciprocate along the length direction of the translation element, the cooling element, the scanning heating element and the jet element are all located above the translation element and are arranged in sequence along the length direction of the translation element, and then, by moving the mold element along the translation element, the mold element is aligned below the jet element, below the cooling element and below the scanning heating element, respectively, to perform different processes, the jet element can inject melt into the mold element, the lower end of the cooling element can extend into the mold element and The melt is cooled and pressed down until the melt in the mold component solidifies to form an alloy ingot, and then the top cooling method in the liquid metal additive process of the alloy ingot is adopted. While cooling, the liquid molding layer on the surface is lightly pressed to increase the thickness of the alloy ingot while the metal liquid layer additively spread on its surface can always maintain a high cooling rate. At the same time, molding under a certain pressure can avoid the formation of internal loose defects. The scanning heating element can heat and melt the surface of the alloy ingot so that when the next layer of melt is injected, it can be metallurgically bonded with the next layer of melt, and finally a highly uniform alloy ingot is produced. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 Schematic diagram of the structure of the liquid metal additive manufacturing device in Example 1;

[0034] Figure 2 is a cross-sectional view of the mold element in Example 1;

[0035] Figure 3 is a top view of the mold element in Example 1;

[0036] Figure 4is a cross-sectional view of the fluidic element in Example 1;

[0037] Figure 5 is a top view of the fluidic element in Example 1;

[0038] Figure 6 is a cross-sectional view of the cooling element in Example 1;

[0039] Figure 7 This is a front view of the scanning heating element in Example 1;

[0040] Figure 8 A top view of the scanning heating element in Example 1;

[0041] Figure 9 This is a process diagram of the cooling element cooling down the melt in Example 2;

[0042] Figure 10 A bottom view of the internal grain structure of a highly uniform 7085 aluminum alloy ingot in a specific embodiment;

[0043] Figure 11 A top view of the internal grain structure of a highly uniform 7085 aluminum alloy ingot in a specific embodiment;

[0044] In the figure: 1-translational element, 11-slide rail, 12-driving part, 2-mold element, 21-mold body, 22-bottom plate, 3-jet element, 31-crucible, 32-push rod type pressure head, 33-heater, 34-nozzle, 35-baffle, 4-cooling element, 41-water-cooled pressure head, 42-cooling channel, 5-scanning heating element, 51-laser head, 52-array laser, 6-alloy ingot, 7-melt, 8-vacuum chamber. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0046] The purpose of the present invention is to provide a liquid metal additive manufacturing device and method to solve the problems existing in the prior art, while increasing the thickness of the alloy ingot and avoiding the formation of internal loose defects.

[0047] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] Example 1

[0049] like Figures 1-11 As shown, this embodiment provides a liquid metal additive manufacturing device, including a vacuum chamber 8, and a translation element 1, a mold element 2, a cooling element 4, a scanning heating element 5 and a jet element 3 placed in the vacuum chamber 8. The vacuum chamber 8 can be used to form a vacuum environment required for manufacturing. The mold element 2 is movably mounted on the translation element 1, and the mold element 2 can reciprocate along the length direction of the translation element 1. The cooling element 4, the scanning heating element 5 and the jet element 3 are all located above the translation element 1 and are arranged in sequence along the length direction of the translation element 1. Then, by moving the mold element 2 along the translation element 1, the mold element 2 is aligned below the jet element 3, below the cooling element 4 and below the scanning heating element 5, respectively, to perform different operations. In the process of forming the alloy ingot 6, the top cooling method is adopted in the process of liquid metal additive manufacturing of the alloy ingot 6. At the same time, the liquid molding layer on the surface is lightly pressed, so that the thickness of the alloy ingot 6 is increased while the metal liquid layer spread on its surface can always maintain a high cooling rate. At the same time, molding under a certain pressure can avoid the formation of internal loose defects. The scanning heating element 5 can heat and melt the surface of the alloy ingot 6 so that when the next layer of melt 7 is injected, it can be metallurgically bonded with the next layer of melt 7, and finally a highly uniform alloy ingot is prepared.

[0050] Specifically, the translation element 1 includes a slide rail 11 and a drive unit 12. The drive unit 12 can enable the mold element 2 to move back and forth along the length direction of the slide rail 11 to a position below the jet element 3, below the cooling element 4, or below the scanning heating element 5 to achieve different processes. The drive unit 12 can be a screw slider structure, a linear motor structure, etc. Those skilled in the art can make adaptive changes to the specific structural form of the drive unit 12 according to actual needs.

[0051] The mold element 2 includes a mold body 21 and a base plate 22. The lower end of the mold body 21 is movably connected to the translation element 1 and can move back and forth along the length direction of the translation element 1. The base plate 22 is installed on the inner bottom surface of the mold body 21. The mold body 21 is used to form an alloy ingot 6.

[0052] The mold body 21 is made of high-temperature resistant heat-insulating material. The shape of the mold body 21 can be adaptively adjusted according to the shape of the required alloy ingot 6 to improve adaptability.

[0053] The jet element 3 includes a crucible 31, a heater 33, a push rod type pressure head 32, a baffle 35 and multiple nozzles 34. The crucible 31 is used to store the melt 7, and the heater 33 is installed on the outer periphery of the crucible 31, so that the melt 7 in the crucible 31 can be heated and kept warm by the heater 33. The nozzle 34 is installed at the lower end of the crucible 31 and is connected to the inside of the crucible 31 to discharge the melt 7 in the crucible 31 through the nozzle 34. The push rod type pressure head 32 is movably installed inside the crucible 31. The power of the push rod type pressure head 32 can be provided by a hydraulic push rod, a linear motor, etc. When the push rod type pressure head 32 moves downward in the crucible 31, it can push the melt 7 in the crucible 31 through the nozzle 34 to allow the melt 7 to enter the mold element 2. The baffle 35 is movably installed at the lower end of the nozzle 34, and the baffle 35 can block or open the nozzle 34 to facilitate the discharge and stop of the melt 7.

[0054] A plurality of nozzles 34 are arranged in an array on the bottom surface of the crucible 31 , thereby enabling uniform material distribution, so as to keep the jet range consistent with the cross section of the mold body 21 during the preparation process.

[0055] The cooling element 4 is a water-cooled ram 41, which can be raised and lowered by a hydraulic push rod, a linear motor, or the like. The water-cooled ram 41 is capable of performing a light pressing action. A cooling channel 42 is provided inside the water-cooled ram 41 for admitting cooling water. Both ends of the cooling channel 42 are connected to the outside world to allow the cooling water to circulate. The melt 7 is then cooled by heat exchange between the cooling water, the water-cooled ram 41, and the melt 7. Furthermore, the water-cooled ram 41 can cool the melt 7 layer on the surface of the alloy ingot 6 while making the alloy ingot 6 more compact.

[0056] The scanning heating element 5 is an array laser 52. The multiple laser heads 51 on the array laser 52 are arranged linearly, and the arrangement direction of the multiple laser heads 51 is parallel to the length direction of the translation element 1. The array laser 52 can move back and forth along the width direction of the translation element 1 and cover the entire upper surface of the alloy ingot 6 in the mold element 2, thereby realizing scanning heating of the surface of the alloy ingot 6 to melt a certain thickness of metal on the surface of the alloy ingot 6 to facilitate combination with the next layer of melt 7.

[0057] The scanning heating element 5 is located above the first station of the translation element 1 , the jet element 3 is located above the second station of the translation element 1 , and the cooling element 4 is located above the third station of the translation element 1 .

[0058] Example 2

[0059] This embodiment provides a liquid metal additive manufacturing method, using the liquid metal additive manufacturing device in the first embodiment, including the following steps:

[0060] S1. The alloy melt to be prepared is refined and then injected into the crucible 31 of the jet element 3. The nozzle 34 of the jet element 3 is blocked by a baffle 35. The heater 33 of the jet element 3 is turned on. The temperature of the alloy melt is controlled to be above the solidification point and kept warm to form a melt 7.

[0061] S2. Turn on the cooling water and allow the cooling water to circulate within the cooling element 4. At the same time, the vacuum chamber 8 is evacuated and filled with high-purity argon gas to atmospheric pressure;

[0062] S3. Move the mold element 2 to the second station of the translation element 1, remove the baffle 35 below the nozzle 34, and push the push rod ram 32 of the fluidic element 3 downward, so that the melt 7, under pressure, forms an array of liquid columns through the nozzle 34 and enters the mold element 2. When the thickness of the liquid layer in the mold element 2 reaches the set thickness value θ1, stop pushing the push rod ram 32 and block the nozzle 34 with the baffle 35.

[0063] S4. The mold element 2 containing the melt 7 is moved to the third station, the water-cooled ram 41 is started and gently pressed down along the inner wall of the mold element 2. When the melt 7 in the mold element 2 is completely solidified to form an alloy ingot 6, the water-cooled ram 41 is lifted;

[0064] S5. The mold element 2 containing the alloy ingot 6 is moved to the first station, the array laser 52 is activated, and the surface of the alloy ingot 6 is scanned and heated horizontally to remelt the surface metal with a thickness of θ2, where θ2 < θ1, and then the array laser 52 is turned off;

[0065] S6. Move the mold element 2 back to the second station, remove the baffle 35 below the nozzle 34, and push the push rod ram 32 downward, so that the melt 7, under pressure, forms an array of liquid columns through the nozzle 34 and enters the mold element 2. When the thickness of the liquid layer in the mold element 2 reaches the set thickness value θ1 again, stop pushing the push rod ram 32 and block the nozzle 34 with the baffle 35.

[0066] S7. Repeat S3-S6 multiple times to finally obtain alloy ingot 6. Specific embodiments

[0068] This specific embodiment can be applied to the preparation of aluminum, magnesium, zinc, titanium, copper and their alloy ingots 6, and can also be applied to the preparation of steel billets. Taking the preparation of 7085 aluminum alloy ingots as an example, the setting range of the main parameters is:

[0069] The internal pressure P of the vacuum chamber 8 is 0≤P<1MPa;

[0070] Nozzle 34 diameter d,0 <d<50mm;

[0071] Nozzle 34 spacing s,0 <s<200mm;

[0072] The thickness of the melt 7 injected into the mold body 21 in a single injection is θ1, 0<θ1<200 mm;

[0073] Push rod type pressure head 32 downward speed v1,0 <v1<300mm / s;

[0074] The surface metal melt thickness θ2 in the mold body 21 is 0<θ2<50 mm.

[0075] The preparation process includes:

[0076] S1. The 7085 aluminum alloy melt was degassed at 750°C, filtered, and then injected into the crucible 31. The nozzle 34 was blocked with a baffle 35, and the heater 33 was turned on to maintain the 7085 aluminum alloy melt temperature at 720°C.

[0077] S2. Turn on the cooling water, and at the same time evacuate the entire vacuum chamber 8 and fill it with high-purity argon gas to atmospheric pressure;

[0078] S3. Move the mold element 2 to the second station, remove the baffle 35 below the nozzle 34 (nozzle 34 diameter 2.4 mm, nozzle 34 spacing 7.6 mm), and push the push rod ram 32 downward at a speed of 1.3 mm / s. Under the action of pressure, the 7085 aluminum alloy melt forms an array of liquid columns through the nozzle 34 and enters the mold element 2. When the liquid layer thickness in the mold element 2 reaches 15 mm, stop pushing the push rod ram 32 and block the nozzle 34 with the baffle 35.

[0079] S4. The mold element 2 is moved to the third station, the water-cooled ram 41 is started and gently pressed down along the inner wall of the mold element 2. When the 7085 aluminum alloy melt is completely solidified to form an alloy ingot 6 thick, lift the water-cooled ram 41;

[0080] S5. The mold element 2 is moved to the first station, the array laser 52 is started and the surface of the alloy ingot 6 is scanned and heated in the horizontal direction to re-melt the surface metal with a thickness of 5 mm, and then the array laser 52 is turned off;

[0081] S6. Move the mold element 2 back to the second station, remove the baffle 35 below the nozzle 34, and push the push rod ram 32 downward. Under the action of pressure, the 7085 aluminum alloy melt forms an array of liquid columns through the nozzle 34 and enters the mold element 2. When the liquid layer thickness in the mold element 2 reaches 15 mm, stop pushing the push rod ram 32 and block the nozzle 34 with the baffle 35.

[0082] S7. Repeat S3-S6 to finally obtain a highly uniform 7085 aluminum alloy ingot with a thickness of 400 mm.

[0083] The internal grain structure of highly uniform 7085 aluminum alloy ingot, such as Figure 10-11 As shown, the average grain size is 70 μm, with high structural uniformity.

[0084] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A liquid metal additive manufacturing device, characterized in that: include: Vacuum chamber; a translation element, the translation element being placed in the vacuum chamber; a mold element, the mold element being placed in the vacuum chamber and movably mounted on the translation element, the mold element being capable of reciprocating along the length direction of the translation element; a fluidic element, the fluidic element being placed in the vacuum chamber and above the translation element, and capable of injecting melt into the mold element; a cooling element, the cooling element being disposed in the vacuum chamber and above the translation element, the lower end of the cooling element being capable of extending into the mold element and cooling the pressed melt until the melt in the mold element solidifies to form an alloy ingot; and a scanning heating element, the scanning heating element being placed in the vacuum chamber and above the translation element, and being capable of heating and melting the surface layer of the alloy ingot; The cooling element, the scanning heating element and the jet element are arranged in sequence along the length direction of the translation element.

2. The liquid metal additive manufacturing device according to claim 1, characterized in that: The translation element includes a slide rail and a driving portion, and the driving portion can make the mold element reciprocate along the length direction of the slide rail to a position below the jet element, below the cooling element, or below the scanning heating element.

3. The liquid metal additive manufacturing device according to claim 1, characterized in that: The mold element includes a mold body and a bottom plate. The lower end of the mold body is movably connected to the translation element, and the bottom plate is installed on the inner bottom surface of the mold body. The mold body is used to form alloy ingots.

4. The liquid metal additive manufacturing device according to claim 3, characterized in that: The casting mold body is made of high temperature resistant heat insulating material.

5. The liquid metal additive manufacturing device according to claim 1, characterized in that: The jet element includes a crucible, a heater, a push rod type pressure head, a baffle and multiple nozzles. The crucible is used to store the melt, and the heater is installed on the outer periphery of the crucible. The nozzle is installed at the lower end of the crucible and is connected to the inside of the crucible. The push rod type pressure head is movably installed inside the crucible and can push the melt in the crucible through the nozzle when the push rod type pressure head moves downward in the crucible. The baffle is movably installed at the lower end of the nozzle and can seal or open the nozzle.

6. The liquid metal additive manufacturing device according to claim 5, characterized in that: A plurality of nozzles are arranged in an array on the lower bottom surface of the crucible.

7. The liquid metal additive manufacturing device according to claim 1, characterized in that: The cooling element is a water-cooled pressure head, and a cooling channel is provided inside the water-cooled pressure head. Both ends of the cooling channel can be connected to the outside world, and the cooling channel is used to pass cooling water.

8. The liquid metal additive manufacturing device according to claim 1, characterized in that: The scanning heating element is an array laser, and the multiple laser heads on the array laser are arranged linearly, and the arrangement direction of the multiple laser heads is parallel to the length direction of the translation element. The array laser can move back and forth along the width direction of the translation element and cover the entire upper surface of the alloy ingot in the mold element.

9. The liquid metal additive manufacturing device according to claim 1, characterized in that: The scanning heating element is located above the first station of the translation element, the jet element is located above the second station of the translation element, and the cooling element is located above the third station of the translation element.

10. A liquid metal additive manufacturing method, characterized in that: The liquid metal additive manufacturing device according to any one of claims 1 to 9 comprises the following steps: S1. The alloy melt to be prepared is refined and then injected into the crucible of the jet element. The nozzle of the jet element is blocked with a baffle, the heater of the jet element is turned on, and the temperature of the alloy melt is controlled to be above the solidification point and kept warm to form a melt; S2. Turn on the cooling water and allow the cooling water to circulate within the cooling element. At the same time, evacuate the vacuum chamber and fill it with high-purity argon gas to atmospheric pressure. S3. Move the mold element to the second station of the translation element, remove the baffle below the nozzle, and push the push rod head of the jet element downward, so that the melt forms an array of liquid columns through the nozzle under pressure and enters the mold element. When the thickness of the liquid layer in the mold element reaches the set thickness value θ1, stop pushing the push rod head and block the nozzle with the baffle; S4. The mold element containing the melt is moved to the third station, the water-cooled pressure head is started and gently pressed down along the inner wall of the mold element. When the melt within the mold element is completely solidified to form an alloy ingot, the water-cooled pressure head is lifted; S5. The mold element containing the alloy ingot is moved to the first station, the array laser is activated and the surface of the alloy ingot is scanned and heated horizontally to remelt the surface metal with a thickness of θ2, where θ2 < θ1, and then the array laser is turned off; S6. Move the mold element back to the second station, remove the baffle below the nozzle, and push the push rod ram downward, so that the melt, under pressure, forms an array of liquid columns through the nozzle and enters the mold element. When the thickness of the liquid layer in the mold element reaches the set thickness value θ1 again, stop pushing the push rod ram and seal the nozzle with the baffle; S7. Repeat S3-S6 multiple times to finally obtain an alloy ingot.

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