Liquid metal additive manufacturing device and method

Abstract

The invention discloses a liquid metal additive manufacturing device and method, and relates to the technical field of metallurgy, the liquid metal additive manufacturing device comprises a vacuum cavity, a translation element, a casting mold element, a cooling element, a scanning heating element and a jet element, and the translation element, the casting mold element, the cooling element, the scanning heating element and the jet element are arranged in the vacuum cavity; the casting mold element can reciprocate in the length direction of the translation element, the cooling element, the scanning heating element and the jet flow element are all located above the translation element and are sequentially arranged in the length direction of the translation element, and the jet flow element can inject melt into the casting mold element; the lower end of the cooling element can stretch into the casting mold element and cool down-pressed melt till the melt in the casting mold element is solidified to form an alloy ingot, and the scanning heating element can heat and melt the surface layer of the alloy ingot. According to the method, the thickness of the alloy ingot is increased, and meanwhile, the internal loosening defect can be avoided.

Description

Technical Field

[0001] The present invention relates to the field of metallurgical 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 is easy to form a fine equiaxed crystal structure; the cooling rate at the center of the ingot is slow, which is easy to form coarse grains. At the same time, for alloys with high alloy content, due to the gravity segregation of alloy elements, or the segregation of alloy elements in the liquid and solid phases, large macroscopic segregation problems are prone to occur, that is, the chemical composition of alloy elements at different positions of the alloy ingot is significantly different. Fluctuations in chemical composition can lead to significant differences in the mechanical properties of alloy ingots at different positions, which need 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 adopts the "discrete-accumulation" principle and directly uses liquid metal as the additive raw material, it improves the preparation efficiency and is therefore an ideal method for preparing highly uniform alloy ingots. However, there are certain problems with the traditional technology, namely, the condensation system is set at the bottom of the alloy ingot, and the alloy liquid is spread on the top of the ingot during the preparation process. The solidification latent heat released by this part of the alloy liquid during the solidification process needs to be transferred downward through the thickness direction of the alloy ingot and taken away by the condensation system. When the thickness of the alloy ingot is small, the thermal resistance of the alloy ingot itself is small; but when the thickness of the alloy ingot increases to a certain critical value, the thermal resistance of the alloy ingot itself will seriously affect the transfer of the solidification latent heat, resulting in a significant decrease in the cooling rate of the surface of the alloy ingot, which is likely to produce a more obvious grain structure difference. At the same time, as the thickness of the alloy ingot increases, the temperature gradient from the surface to the bottom of the alloy ingot continues to decrease. For the alloy, this means that the spatial depth range corresponding to the solid-liquid two-phase region at the front of the liquid-solid interface will continue to increase, that is, the thickness of the mushy zone will continue to increase, and the expansion of the solidification zone will bring a greater 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, wherein the translation element is placed in the vacuum chamber;

[0009] A mold element, the mold element is placed in the vacuum chamber and is movably mounted on the translation element, and the mold element can reciprocate along the length direction of the translation element;

[0010] A fluidic element, which is placed in the vacuum chamber and above the translation element, and can inject melt into the mold element;

[0011] A cooling element, wherein the cooling element is disposed in the vacuum chamber and is located above the translation element, and the lower end of the cooling element can extend into the mold element and cool the pressed melt until the melt in the mold element solidifies to form an alloy ingot; and

[0012] A scanning heating element, wherein the scanning heating element is placed in the vacuum chamber and above the translation element, and the scanning heating element can heat and melt 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 comprises 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 fluidic 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 casting 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 circumference 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 the push rod type pressure head can push the melt in the crucible through the nozzle when it moves downward in the crucible, and the baffle is movably installed at the lower end of the nozzle, and the baffle can block 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, 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 reciprocate 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 a first station of the translation element, the jet element is located above a second station of the translation element, and the cooling element is located above a 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, the temperature of the alloy melt is controlled above the solidification point temperature and kept warm to form a melt;

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

[0025] S3. Move the mold element to the second station of the translation element, remove the baffle under the nozzle, push the push rod pressure head of the jet element downward, so that the melt forms an array of liquid columns through the nozzle under the action of 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 pressure 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 lightly pressed down along the inner wall of the mold element, and when the melt in the mold element is completely solidified to form an alloy ingot, the water-cooled pressure head is lifted;

[0027] S5. Move the mold element containing the alloy ingot to the first station, start the array laser and scan and heat the surface of the alloy ingot in the horizontal direction, re-melt the surface metal with a thickness of θ2, and θ2<θ1, and then turn off the array laser;

[0028] S6. Move the mold element to the second station again, remove the baffle under the nozzle, and push the push rod pressure head downward, so that the melt forms an array of liquid columns through the nozzle under the action of pressure 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 pressure head and block the nozzle with the baffle;

[0029] S7. Repeat S3-S6 for 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, a cooling element, a scanning heating element and a jet element are all located above the translation element and are arranged in sequence along the length direction of the translation element, and then, through the movement of the mold element along the translation element, the mold element is aligned with the bottom of the jet element, the bottom of the cooling element and the bottom of 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 casting mold element solidifies to form an alloy ingot, and then the top cooling method in the process of liquid metal additive 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 spread on its surface additively 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 layer 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 prepared. 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 drawings required for use in the embodiments will be briefly introduced below. 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 creative work.

[0033] Figure 1 It is a structural schematic diagram 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 the first embodiment;

[0037] Figure 5 is a top view of the fluidic element in the first embodiment;

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

[0039] Figure 7 It is a front view of the scanning heating element in the first embodiment;

[0040] Figure 8 is a top view of the scanning heating element in the first embodiment;

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

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

[0043] Fig.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-translation 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 cavity. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work 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, and to avoid the formation of internal loose defects while increasing the thickness of the alloy ingot.

[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] Embodiment 1

[0049] like Figure 1-Figure 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 installed 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, through the movement of the mold element 2 along the translation element 1, the mold element 2 is aligned with the bottom of the jet element 3, the bottom of the cooling element 4 and the bottom of the scanning heating element 5, respectively, so as to perform different operations. In the process of adding liquid metal to the alloy ingot 6, the top cooling method is adopted, and the liquid molding layer on the surface is lightly pressed while cooling, so that the thickness of the alloy ingot 6 is increased while the metal liquid layer spread on the 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 driving part 12. The driving part 12 can enable the mold element 2 to reciprocate 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 realize different processes. The driving part 12 can be a screw slider structure, a linear motor structure, etc. Technical personnel in this field can make adaptive changes to the specific structural form of the driving part 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 reciprocate 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 alloy ingots 6.

[0052] The mold body 21 is made of high temperature resistant heat insulating material, and the shape of the mold body 21 can be adaptively adjusted according to the required shape of the 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 a plurality of 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 so that the melt 7 in the crucible 31 can be discharged 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, the melt 7 in the crucible 31 can be pushed out through the nozzle 34 so that the melt 7 enters 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 achieving 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 lifted and lowered by a hydraulic push rod, a linear motor, etc. The water-cooled ram 41 can perform a light pressing action, and a cooling channel 42 is provided inside the water-cooled ram 41. The cooling channel 42 is used to pass cooling water. Both ends of the cooling channel 42 can be connected to the outside to realize the circulation and circulation of cooling water, and then the melt 7 is cooled by heat exchange between the cooling water, the water-cooled ram 41 and the melt 7. In addition, 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 dense.

[0056] The scanning heating element 5 is an array laser 52, and 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 reciprocate 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] Embodiment 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 to control the temperature of the alloy melt to be above the solidification point and keep the temperature to form a melt 7;

[0061] S2. Turn on the cooling water and allow the cooling water to flow through the cooling element 4. At the same time, evacuate the vacuum chamber 8 and fill it with high-purity argon gas to normal 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, push the push rod ram 32 of the jet element 3 downward, so that the melt 7 forms an array of liquid columns through the nozzle 34 under the action of pressure 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. Move the mold element 2 containing the melt 7 to the third station, start the water-cooled pressure head 41 and gently press down along the inner wall of the mold element 2. When the melt 7 in the mold element 2 completely solidifies to form an alloy ingot 6, lift the water-cooled pressure head 41;

[0064] S5. Move the mold element 2 containing the alloy ingot 6 to the first station, start the array laser 52 and scan and heat the surface of the alloy ingot 6 in the horizontal direction to re-melt the surface metal with a thickness of θ2, and θ2<θ1, and then turn off the array laser 52;

[0065] S6. Move the mold element 2 to the second station again, remove the baffle 35 under the nozzle 34, and push the push rod type pressure head 32 downward, so that the melt 7 forms an array of liquid columns through the nozzle 34 under the action of pressure 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 type pressure head 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 material ingots. Taking the preparation of 7085 aluminum alloy ingots as an example, the setting range of the main parameters is:

[0069] The internal pressure of the vacuum chamber 8 is P, 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 at a single time is θ1, 0<θ1<200 mm;

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

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

[0075] The preparation process includes:

[0076] S1. The 7085 aluminum alloy melt is degassed and filtered at 750°C, and then injected into the crucible 31, the nozzle 34 is blocked with a baffle 35, the heater 33 is turned on, and the temperature of the 7085 aluminum alloy melt is maintained 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 normal pressure;

[0078] S3. Move the mold element 2 to the second station, remove the baffle 35 below the nozzle 34 (the nozzle 34 has a diameter of 2.4 mm and a spacing of 7.6 mm), and push the push rod ram 32 downward at a speed of 1.3 mm / s, so that the 7085 aluminum alloy melt forms an array of liquid columns through the nozzle 34 under pressure and enters the mold element 2. When the thickness of the liquid layer 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 pressure head 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, the water-cooled pressure head 41 is lifted;

[0080] S5. Move the mold element 2 to the first station, start the array laser 52 and scan and heat the surface of the alloy ingot 6 in the horizontal direction to re-melt the surface metal with a thickness of 5 mm, and then turn off the array laser 52;

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

[0082] S7. Repeat S3-S6 to finally obtain a high-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 organizational uniformity.

[0084] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A liquid metal additive manufacturing device, characterized in that: include: Vacuum chamber; A translation element, wherein the translation element is placed in the vacuum chamber; A mold element, the mold element is placed in the vacuum chamber and is movably mounted on the translation element, and the mold element can reciprocate along the length direction of the translation element; A fluidic element, which is placed in the vacuum chamber and above the translation element, and can inject melt into the mold element; A cooling element, wherein the cooling element is disposed in the vacuum chamber and is located above the translation element, and the lower end of the cooling element can extend into the mold element and cool the pressed melt until the melt in the mold element solidifies to form an alloy ingot; and A scanning heating element, wherein the scanning heating element is placed in the vacuum chamber and above the translation element, and the scanning heating element can heat and melt 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 enable 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.

3. The liquid metal additive manufacturing device according to claim 1, characterized in that: The mold element comprises 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, and 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 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 circumference 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 pressure head is movably installed inside the crucible, and the push rod pressure head can push the melt in the crucible through the nozzle when it moves downward in the crucible. The baffle is movably installed at the lower end of the nozzle, and the baffle can block 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, 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 reciprocate 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, the temperature of the alloy melt is controlled above the solidification point temperature and kept warm to form a melt; S2. Turn on the cooling water and allow the cooling water to flow in the cooling element. At the same time, evacuate the vacuum chamber and fill it with high-purity argon gas to normal pressure; S3. Move the mold element to the second station of the translation element, remove the baffle under the nozzle, push the push rod pressure head of the jet element downward, so that the melt forms an array of liquid columns through the nozzle under the action of 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 pressure 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 lightly pressed down along the inner wall of the mold element, and when the melt in the mold element is completely solidified to form an alloy ingot, the water-cooled pressure head is lifted; S5. Move the mold element containing the alloy ingot to the first station, start the array laser and scan and heat the surface of the alloy ingot in the horizontal direction, re-melt the surface metal with a thickness of θ2, and θ2<θ1, and then turn off the array laser; S6. Move the mold element to the second station again, remove the baffle under the nozzle, and push the push rod pressure head downward, so that the melt forms an array of liquid columns through the nozzle under the action of pressure 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 pressure head and block the nozzle with the baffle; S7. Repeat S3-S6 for multiple times to finally obtain an alloy ingot.

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