Micro-droplet jetting additive manufacturing device based on cold crucible suspension smelting

Abstract

The invention discloses a micro-droplet jetting additive manufacturing device based on cold crucible suspension smelting, which adopts a water-cooled copper crucible to replace a traditional common oxide crucible, so that the smelting temperature of a micro-droplet jetting system is increased, the melting of a high-melting-point material is facilitated, and the production efficiency of the micro-droplet jetting additive manufacturing device is improved. And the material application range of the micro-droplet spraying additive manufacturing technology is expanded, and micro-droplet spraying additive manufacturing is allowed to be conducted through high-melting-point and high-activity materials. The electromagnetic suspension system formed by the high-frequency induction coil and the water-cooled copper crucible is adopted, so that molten metal can be suspended inside the water-cooled copper crucible, direct contact between alloy melt and the wall of the crucible is avoided, the possibility that the alloy reacts with a crucible material in the smelting process is reduced, and the purity and performance of the alloy are improved. In addition, by means of electromagnetic stirring and heat convection in the crucible, alloy elements can be mixed more uniformly, and the forming quality and performance of the alloy are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal additive manufacturing, and in particular relates to a droplet jet additive manufacturing device based on cold crucible suspension smelting. Background Art

[0002] The droplet jetting additive manufacturing technology uses tiny disturbances to eject liquid from a small hole to form continuous uniform droplets, and forms three-dimensional parts by precisely controlling the three-dimensional deposition of droplets. This manufacturing technology can use a wide range of forming materials, has high forming accuracy, low cost, and low energy consumption. It can quickly and accurately manufacture parts of any complex shape on a single device, thus realizing the "free manufacturing" of parts, solving the forming of many complex structural parts, reducing processing steps, and shortening the processing cycle. As an emerging frontier technology in the manufacturing field, it has broad application prospects in the fields of bioprinting, electronic manufacturing, and materials science.

[0003] At present, the droplet jet additive manufacturing technology cannot be applied to some high-performance alloys with high melting points, high activity and complex compositions, such as titanium alloys, refractory alloys, refractory high-entropy alloys, and multi-principal alloys, which greatly limits the further promotion of this technology. Traditional droplet jet additive manufacturing devices use oxide crucibles, which soften when the temperature exceeds 1500°C and cannot meet the melting temperature required for high-performance alloys. Moreover, these high-performance alloys contain a large number of active elements, which are easy to react chemically with the crucible material in a high-temperature molten state, affecting the quality of melting and the service life of the crucible. In addition, the complexity of the composition of high-performance alloys makes it difficult to uniform the composition of the alloy melt, affecting the molding quality. Summary of the invention

[0004] In view of the problems in the prior art that oxide crucibles cannot meet the required melting temperature of high-performance alloys and that high-performance alloys are prone to chemical reaction with crucible materials in a high-temperature molten state, the present invention provides a droplet jetting additive manufacturing device based on cold crucible suspension melting. The droplet jetting additive manufacturing device realizes ultra-high temperature clean melting of alloys and on-demand deposition of droplets, can form complex three-dimensional components, and greatly expands the range of materials applicable to the droplet jetting additive manufacturing technology.

[0005] The present invention adopts the following specific technical solutions:

[0006] A droplet jetting additive manufacturing device based on cold crucible suspension smelting, the droplet jetting additive manufacturing device comprising a pneumatic jetting device and a heating suspension device; the pneumatic jetting device comprises an end cover, an exhaust valve, a ball valve, a solenoid valve, a pressure reducing valve, a protective gas source and a nozzle; the heating suspension device comprises a housing, a water-cooled copper crucible, a medium-frequency heating coil and a high-frequency induction coil;

[0007] The end cover is sealed and installed on the top of the water-cooled copper crucible and the shell, and is provided with a feed port, an exhaust channel, an air inlet channel and a temperature sensor inlet which are connected to the inner cavity of the water-cooled copper crucible; the feed port is used to add molten material into the water-cooled copper crucible; the outlet of the exhaust channel is connected to an exhaust pipe for discharging the gas in the water-cooled copper crucible; the exhaust valve and the ball valve are installed in the exhaust pipe; the exhaust valve is used to relieve pressure to shrink the excess molten liquid in the nozzle; the air inlet channel is connected to the protective gas source through the air inlet pipe, and is used to fill the water-cooled copper crucible with protective gas; the solenoid valve and the pressure reducing valve are installed in the air inlet pipe; the solenoid valve is used to apply a pressure pulse to the inside of the water-cooled copper crucible by controlling the opening and closing; the pressure reducing valve is used to adjust the pressure of the protective gas, and the amplitude of the air pressure pulse is changed by adjusting the outlet pressure of the pressure reducing valve; the temperature sensor inlet is used to install a temperature sensor to timely observe the temperature in the water-cooled copper crucible;

[0008] The water-cooled copper crucible is placed in the shell and is composed of a plurality of crucible petals uniformly distributed along the circumference; an annular cavity is formed between the inner wall of the shell and the outer wall of the water-cooled copper crucible; the nozzle is installed at the bottom center of the shell, and the nozzle is connected with the bottom of the inner cavity of the water-cooled copper crucible; a power line inlet is provided on the side wall of the shell; the medium frequency heating coil and the high frequency induction coil are located in the annular cavity, and are wound on the outer wall of the water-cooled copper crucible, and are connected to the power supply through the power line inlet; the medium frequency heating coil is used to heat the molten material in the water-cooled copper crucible and melt it; the high frequency induction coil is used to generate an alternating magnetic field to suspend the molten metal in the water-cooled copper crucible.

[0009] When a pressure pulse is applied to the inside of the water-cooled copper crucible, the liquid metal in the water-cooled copper crucible is affected by the pressure pulse to spray metal droplets through the nozzle, completing the spraying process.

[0010] Furthermore, the medium frequency heating coil is located on the upper part of the water-cooled copper crucible;

[0011] The high-frequency induction coil is located at the lower part of the water-cooled copper crucible.

[0012] Furthermore, the bottom of the shell is provided with a water inlet, a water return port and a water inlet tank;

[0013] A water return pipe extending in a vertical direction is buried in each of the crucible petals, and a water return groove is provided at the bottom of each of the crucible petals; the water return port and the water return pipe are both connected to the water return groove;

[0014] The water inlet pipe is inserted into the water return pipe; the water inlet pipe and the water inlet are both connected to the water inlet tank;

[0015] When the water-cooled copper crucible is working, cooling water flows from the water inlet into the water inlet tank, then flows through the water inlet pipe, the water return pipe and the water return tank in sequence, and then flows out of the shell through the water return port.

[0016] Furthermore, the water-cooled copper crucible is composed of 12 crucible petals.

[0017] Furthermore, the end cover is a circular plate;

[0018] The outer shell is a cylinder and has an outer diameter that is the same as that of the end cover;

[0019] The top surface of the water-cooled copper crucible is flush with the top surface of the shell;

[0020] The bottom end surface of the end cover is sealed with the water-cooled copper crucible and the top end surface of the shell.

[0021] Furthermore, a thermocouple is installed in the temperature sensor inlet.

[0022] Furthermore, it also includes a high temperature sealing ring installed on the bottom end surface of the end cover;

[0023] The high-temperature sealing ring is used to seal the end cover, the outer shell and the water-cooled copper crucible to prevent gas leakage in a high-temperature environment.

[0024] Beneficial effects:

[0025] 1. The droplet jetting additive manufacturing device of the present invention adopts a water-cooled copper crucible instead of a traditional ordinary oxide crucible, which increases the melting temperature of the droplet jetting system, is beneficial to the melting of high-melting-point materials, expands the material application range of the droplet jetting additive manufacturing technology, and allows the use of high-melting-point and high-activity materials for droplet jetting additive manufacturing.

[0026] 2. The droplet jetting additive manufacturing device of the present invention has a high-frequency induction coil wound on the outer wall of a water-cooled copper crucible. The alternating magnetic field generated by the high-frequency induction coil allows the molten metal to be suspended in the water-cooled copper crucible. The electromagnetic suspension system formed by the high-frequency induction coil and the water-cooled copper crucible can suspend the molten metal in the water-cooled copper crucible, thereby avoiding direct contact between the alloy melt and the crucible wall, reducing the possibility of reaction between the alloy and the crucible material during the smelting process, and thus improving the purity and performance of the alloy.

[0027] 3. The droplet jet additive manufacturing device of the present invention adopts an induction coil heating system to produce a magnetic stirring effect on the melt, and the forced cooling of the water-cooled copper crucible promotes the thermal convection of the melt, so that the alloy elements can be mixed more evenly, effectively solving the problem of the difficulty in uniform composition of alloys with complex components, and improving the molding quality and performance of the alloy.

[0028] 4. The droplet jet additive manufacturing device of the present invention is provided with a feed port on the end cover, through which the molten material can be added to the water-cooled copper crucible, so there is no specific requirement for the shape of the raw materials, and the manufacturing process of powders, wires or plates required by traditional metal additive manufacturing technology can be omitted, thereby shortening the process flow and reducing production costs.

[0029] 5. The droplet jet additive manufacturing device of the present invention has the characteristics of efficient jetting, can perform jetting operations quickly and continuously, and can realize the rapid prototyping of large and complex components; in addition, it can also prepare powder particles with high sphericity and uniform particle size in a short time. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a cross-sectional view of a droplet jetting additive manufacturing device according to the present invention;

[0031] Figure 2 for Figure 1 Sectional view of section AA;

[0032] Figure 3 for Figure 1 Cross-sectional view of section BB.

[0033] Among them, 1-end cover, 2-feed port, 3-exhaust valve, 4-ball valve, 5-exhaust pipe, 6-intake pipe, 7-solenoid valve, 8-pressure reducing valve, 9-protective gas cylinder, 10-temperature sensor inlet, 11-housing, 12-medium frequency induction coil, 13-high frequency induction coil, 14-water return port, 15-water return tank, 16-water inlet tank, 17-nozzle, 18-water inlet pipe, 19-water return pipe, 20-water inlet, 21-power cord inlet, 22-crucible petal, 23-water-cooled copper crucible, 24-high temperature sealing ring. DETAILED DESCRIPTION

[0034] 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.

[0035] like Figure 1 As shown in the structure, this embodiment provides a droplet injection additive manufacturing device based on cold crucible suspension smelting, and the droplet injection additive manufacturing device includes a pneumatic injection device and a heating suspension device; the pneumatic injection device includes an end cover 1, an exhaust valve 3, a ball valve 4, a solenoid valve 7, a pressure reducing valve 8, a protective gas source and a nozzle 17; the heating suspension device includes a shell 11, a water-cooled copper crucible 23, a medium frequency heating coil and a high frequency induction coil 13.

[0036] The end cover 1 is sealed and installed on the top of the water-cooled copper crucible 23 and the outer shell 11, and is provided with a feed port 2, an exhaust channel, an air intake channel and a temperature sensor inlet 10 connected to the inner cavity of the water-cooled copper crucible 23. The end cover 1 can be a circular plate, and the thickness is relatively thick; the outer shell 11 is a cylinder with an open top, and the outer diameter of the outer shell 11 is the same as the outer diameter of the end cover 1; the top surface of the water-cooled copper crucible 23 is flush with the top surface of the outer shell 11; the bottom surface of the end cover 1 is sealed and matched with the top surfaces of the water-cooled copper crucible 23 and the outer shell 11. The above-mentioned droplet jetting additive manufacturing device also includes a high-temperature sealing ring 24 installed on the bottom surface of the end cover 1; the high-temperature sealing ring 24 is clamped between the end cover 1 and the outer shell 11, and between the end cover 1 and the water-cooled copper crucible 23, and the high-temperature sealing ring 24 is used to seal the end cover 1, the outer shell 11 and the water-cooled copper crucible 23 to prevent gas leakage in a high-temperature environment.

[0037] The feed port 2 penetrates the thickness setting of the end cover 1, and is used to add molten material into the water-cooled copper crucible 23. The exhaust channel penetrates the thickness setting of the end cover 1, and the outlet of the exhaust channel is connected to an exhaust pipe. The exhaust channel in the end cover 1 is connected to the exhaust pipe outside the end cover 1 to form an exhaust pipe 5, and the exhaust pipe 5 is used to release the gas in the water-cooled copper crucible 23; an exhaust valve 3 and a ball valve 4 are installed in the exhaust pipe; the exhaust valve 3 is used for pressure relief, and the excess melt in the nozzle 17 can be retracted while the pressure is relieved; the air inlet channel is connected to the protective gas source through the air inlet pipe, and the air inlet channel in the end cover 1 is connected to the air inlet pipe outside the end cover 1 to form an air inlet pipe 6, and the protective gas is filled into the water-cooled copper crucible 23 through the air inlet pipe 6; Figure 1 As shown, the exhaust channel is arranged in the vertical direction and penetrates the thickness of the end cover 1, the air inlet channel is arranged in the horizontal direction and intersects with the exhaust channel vertically, the exhaust channel and the air inlet channel are connected and share a section of the pipeline; the solenoid valve 7 and the pressure reducing valve 8 are installed in the air inlet pipe; the solenoid valve 7 is used to control the on-off of the air inlet pipe, and a pressure pulse is applied to the inside of the water-cooled copper crucible 23 by controlling the opening and closing; the pressure reducing valve 8 is used to adjust the pressure of the protective gas output from the protective gas source, and the amplitude of the pressure pulse is changed by adjusting the outlet pressure of the pressure reducing valve 8; the protective gas source can be a protective gas cylinder 9 with protective gas stored inside; the temperature sensor inlet 10 is used to install a temperature sensor such as a thermocouple to timely observe the temperature inside the water-cooled copper crucible 23.

[0038] The water-cooled copper crucible 23 is placed in the outer shell 11 and is composed of a plurality of crucible petals 22 evenly distributed along the circumferential direction; adjacent crucible petals 22 are sealed; the water-cooled copper crucible 23 can be coaxially arranged with the outer shell 11; the water-cooled copper crucible 23 can be composed of 12 crucible petals 22 evenly distributed along the circumferential direction; the petal-shaped structure of the water-cooled copper crucible 23 not only helps to evenly distribute heat inside the crucible, but also helps to evenly dissipate heat, thereby extending the service life of the water-cooled copper crucible 23.

[0039] The water-cooled copper crucible 23 is placed in the shell 11, and an annular cavity is formed between the inner wall of the shell 11 and the outer wall of the water-cooled copper crucible 23; a nozzle 17 is installed at the bottom center of the shell 11, and the nozzle 17 is connected to the bottom of the inner cavity of the water-cooled copper crucible 23; a power line inlet 21 is provided on the side wall of the shell 11; the medium frequency heating coil and the high frequency induction coil 13 are located in the annular cavity, and are wound on the outer wall of the water-cooled copper crucible 23, and are connected to the power supply through the power line inlet 21; Figure 1 As shown, the medium frequency heating coil is located at the upper part of the water-cooled copper crucible 23; the high frequency induction coil 13 is located at the lower part of the water-cooled copper crucible 23; and the power line inlet 21 is located between the medium frequency heating coil and the high frequency induction coil 13. The medium frequency heating coil is used to heat the molten material in the water-cooled copper crucible 23 and melt it; the high frequency induction coil 13 is used to generate an alternating magnetic field to suspend the molten metal in the water-cooled copper crucible 23.

[0040] When a pressure pulse is applied to the inside of the water-cooled copper crucible 23, the liquid metal in the water-cooled copper crucible 23 is affected by the gas pressure pulse and ejects metal droplets through the nozzle 17, completing the ejection process.

[0041] like Figure 1 The bottom of the shell 11 is provided with a water inlet 20, a water return port 14 and a water inlet groove 16; a water return pipe 19 extending in the vertical direction is buried in each crucible petal 22, and a water return groove 15 is provided at the bottom of each crucible petal 22; the water return port 14 and the water return pipe 19 are both connected to the water return groove 15; the outer diameter of the water inlet pipe 18 is smaller than the inner diameter of the water return pipe 19, and the water inlet pipe 18 is inserted into the water return pipe 19, and an annular cavity is formed between the water inlet pipe 18 and the water return pipe 19; the water inlet The pipe 18 and the water inlet 20 are both connected to the water inlet trough 16; when the water-cooled copper crucible 23 is working, the cooling water flows from the outside of the shell 11 through the water inlet 20 into the water inlet trough 16 in the shell 11. When the cooling water reaches the top of the water inlet pipe 18, it will enter the return pipe 19 from the water inlet pipe 18, flow down along the return pipe 19 into the return trough 15, and then flow out of the shell 11 through the return port 14, realizing the cooling water circulation and taking away the heat inside the crucible petal 22. When the water-cooled copper crucible 23 is composed of 12 crucible petals 22, the 12 water inlet pipes 18 are connected to the water inlet trough 16, and the 12 return pipes 19 are connected to the return trough 15, ensuring the rapid circulation of cooling water.

[0042] During operation, the above-mentioned droplet jetting additive manufacturing device transports the molten material into the water-cooled copper crucible 23 through the feed port 2, and the medium frequency heating coil and the high frequency induction coil 13 are connected to the power supply through the power line inlet 21 to work. The electromagnetic field generated by the medium frequency heating coil is used to heat the inside of the water-cooled copper crucible 23, and the molten material in the water-cooled copper crucible 23 is melted. When the high frequency induction coil 13 is supplied with alternating current, an alternating magnetic field is generated, and the molten liquid metal is suspended inside the water-cooled copper crucible 23. The outer wall of the crucible flap 22 is water-cooled and cooled by connecting an external cooling water source through the water inlet 20, the water inlet trough 16 and the water inlet pipe 18, and the cooling water after absorbing heat is discharged through the return pipe 19, the return trough 15 and the return port 14. When the solenoid valve 7 is controlled to apply a pressure pulse to the inside of the water-cooled copper crucible 23, the liquid metal in the water-cooled copper crucible 23 is subjected to the air pressure pulse and sprays metal droplets through the lower nozzle 17 to complete the spraying process. In addition, the pressure can be released through the exhaust valve 3, and the excess melt in the nozzle 17 can be retracted while the pressure is released, so as to achieve on-demand and precise control. A temperature sensor inlet 10 is provided on the right side of the end cover 1 to connect a sensor such as a thermocouple, so that the temperature change in the crucible can be observed in time and adjustments can be made in time.

[0043] The above-mentioned droplet jetting additive manufacturing device adopts a water-cooled copper crucible 23 instead of a traditional oxide crucible. The side wall of the water-cooled copper crucible 23 is cooled by circulating a cooling liquid such as cooling water, thereby increasing the melting temperature of the droplet jetting system, facilitating the melting of high-melting-point materials, and expanding the material application range of the droplet jetting additive manufacturing technology, allowing the use of high-melting-point and high-activity materials for droplet jetting additive manufacturing; a high-frequency induction coil 13 is wound around the outer wall of the water-cooled copper crucible 23, and the molten metal is suspended in the water-cooled copper crucible 23 by the alternating magnetic field generated by the high-frequency induction coil 13. The electromagnetic suspension system formed by the high-frequency induction coil 13 and the water-cooled copper crucible 23 can suspend the molten metal inside the water-cooled copper crucible 23, avoiding direct contact between the alloy melt and the crucible wall, reducing the possibility of the alloy reacting with the crucible material during the smelting process, thereby improving the purity and performance of the alloy; the use of the medium-frequency induction coil 12 for heating can produce a magnetic stirring effect on the melt, and the forced cooling of the water-cooled copper crucible 23 promotes the thermal convection of the melt, so that the alloy elements can be mixed more evenly, effectively solving the problem of difficult uniformity of the composition of alloys with complex components, and improving the molding quality and performance of the alloy.

[0044] The above-mentioned droplet jet additive manufacturing device is provided with a feed port 2 on the end cover 1, and the feed port 2 is set to penetrate the thickness of the end cover 1. Various forms of molten materials can be added to the water-cooled copper crucible 23 through the feed port 2, so there is no specific requirement for the shape of the raw materials, and the manufacturing links of powders, wires or plates required by traditional metal additive manufacturing technology can be omitted, thereby shortening the process flow and reducing production costs.

[0045] The electromagnetic valve 7 is used to control the on-off of the air intake pipeline, so that the above-mentioned droplet jetting additive manufacturing device has the characteristics of efficient jetting and can perform jetting operations quickly and continuously. A three-dimensionally movable platform is arranged under the ejected droplets. Through the three-dimensional movement of the platform, rapid prototyping of large and complex components can be achieved; in addition, powder particles with high sphericity and uniform particle size can be prepared in a short time.

[0046] In addition, the droplet jet additive manufacturing device of the present invention is based on cold crucible suspension smelting. By using electromagnetic stirring and heat convection in the crucible, the alloy elements can be mixed more evenly, thereby improving the molding quality and performance of the alloy.

[0047] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A droplet jetting additive manufacturing device based on cold crucible suspension smelting, characterized in that: It includes a pneumatic injection device and a heating suspension device; the pneumatic injection device includes an end cover, an exhaust valve, a ball valve, a solenoid valve, a pressure reducing valve, a protective gas source and a nozzle; the heating suspension device includes a shell, a water-cooled copper crucible, a medium-frequency heating coil and a high-frequency induction coil; The end cover is sealed and installed on the top of the water-cooled copper crucible and the shell, and is provided with a feed port, an exhaust channel, an air inlet channel and a temperature sensor inlet which are connected to the inner cavity of the water-cooled copper crucible; the feed port is used to add molten material into the water-cooled copper crucible; the outlet of the exhaust channel is connected to an exhaust pipe for discharging the gas in the water-cooled copper crucible; the exhaust valve and the ball valve are installed in the exhaust pipe; the exhaust valve is used to relieve pressure to shrink the excess molten liquid in the nozzle; the air inlet channel is connected to the protective gas source through the air inlet pipe, and is used to fill the water-cooled copper crucible with protective gas; the solenoid valve and the pressure reducing valve are installed in the air inlet pipe; the solenoid valve is used to apply a pressure pulse to the inside of the water-cooled copper crucible by controlling the opening and closing; the pressure reducing valve is used to adjust the pressure of the protective gas, and the amplitude of the air pressure pulse is changed by adjusting the outlet pressure of the pressure reducing valve; the temperature sensor inlet is used to install a temperature sensor to timely observe the temperature in the water-cooled copper crucible; The water-cooled copper crucible is placed in the shell and is composed of a plurality of crucible petals uniformly distributed along the circumference; an annular cavity is formed between the inner wall of the shell and the outer wall of the water-cooled copper crucible; the nozzle is installed at the bottom center of the shell, and the nozzle is connected with the bottom of the inner cavity of the water-cooled copper crucible; a power line inlet is provided on the side wall of the shell; the medium frequency heating coil and the high frequency induction coil are located in the annular cavity, and are wound on the outer wall of the water-cooled copper crucible, and are connected to the power supply through the power line inlet; the medium frequency heating coil is used to heat the molten material in the water-cooled copper crucible and melt it; the high frequency induction coil is used to generate an alternating magnetic field to suspend the molten metal in the water-cooled copper crucible. When a pressure pulse is applied to the inside of the water-cooled copper crucible, the liquid metal in the water-cooled copper crucible is affected by the pressure pulse to spray metal droplets through the nozzle, completing the spraying process.

2. The droplet jetting additive manufacturing device according to claim 1, characterized in that: The medium frequency heating coil is located on the upper part of the water-cooled copper crucible; The high-frequency induction coil is located at the lower part of the water-cooled copper crucible.

3. The droplet jetting additive manufacturing device according to claim 2, characterized in that: The bottom of the shell is provided with a water inlet, a water return port and a water inlet tank; A water return pipe extending in a vertical direction is buried in each of the crucible petals, and a water return groove is provided at the bottom of each of the crucible petals; the water return port and the water return pipe are both connected to the water return groove; The water inlet pipe is inserted into the water return pipe; the water inlet pipe and the water inlet are both connected to the water inlet tank; When the water-cooled copper crucible is working, cooling water flows from the water inlet into the water inlet tank, then flows through the water inlet pipe, the water return pipe and the water return tank in sequence, and then flows out of the shell through the water return port.

4. The droplet jetting additive manufacturing device according to claim 3, characterized in that: The water-cooled copper crucible is composed of 12 crucible petals.

5. The droplet jetting additive manufacturing device according to claim 1, characterized in that: The end cover is a circular plate; The outer shell is a cylinder and has an outer diameter that is the same as that of the end cover; The top surface of the water-cooled copper crucible is flush with the top surface of the shell; The bottom end surface of the end cover is sealed with the water-cooled copper crucible and the top end surface of the shell.

6. The droplet jetting additive manufacturing device according to claim 1, characterized in that: A thermocouple is installed in the temperature sensor inlet.

7. The droplet jetting additive manufacturing device according to any one of claims 1 to 6, characterized in that: Also includes a high temperature sealing ring installed on the bottom end surface of the end cover; The high-temperature sealing ring is used to seal the end cover, the outer shell and the water-cooled copper crucible to prevent gas leakage in a high-temperature environment.

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