Additive manufacturing welding method and device for high-temperature-resistant alloy shell of heater

Abstract

The invention provides an additive manufacturing welding method and device for a high-temperature-resistant alloy shell of a heater, and relates to the technical field of additive manufacturing. The additive manufacturing welding device for the high-temperature-resistant alloy shell of the heater comprises an operation table plate, a forming box body is fixedly connected to the upper surface of the operation table plate, and a forming base table is fixedly connected to the inner bottom of the forming box body. According to the cooling device, a first water suction pump is started, outside cold water is pumped through a first mounting pipe, the cold water enters a rotating hollow pipe through the first mounting pipe and then enters a plurality of second cold water pipes through a fourth cold water pipe, a workpiece is cooled, a first servo motor is started, an output shaft of the first servo motor drives a first belt pulley to rotate, and the first servo motor drives a second belt pulley to rotate; and the rotating hollow pipe drives the rotating plate body to rotate, the positions of the multiple second cold water pipes are changed, the periphery of the formed workpiece is evenly cooled, heat around the workpiece is greatly reduced, and the forming quality of the workpiece is improved advantageously.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and in particular to an additive manufacturing welding method and device for a high-temperature resistant alloy shell of a heater. Background Art

[0002] Additive manufacturing, also known as 3D printing, is based on a computer three-dimensional digital model. Through software layered discretization and CNC forming systems, powders, resins, thermoplastics and other materials are stacked and bonded layer by layer on a two-dimensional plane using lasers, electron beams, hot melt nozzles and other methods, thereby quickly manufacturing physical products consistent with the digital model design. Unlike traditional subtractive manufacturing technology, additive manufacturing significantly reduces the consumption of raw materials during the removal, cutting and reprocessing processes. At the same time, it is not restricted by traditional processing technology and can be optimized or freely reshaped in the product design process, greatly reducing the difficulty and time loss of subsequent process flows. Additive manufacturing integrates multiple technologies such as IT, advanced materials, and intelligent manufacturing. It is considered one of the most disruptive and representative emerging technologies in the manufacturing industry and represents the development direction of high-end manufacturing.

[0003] During the production process of the high-temperature resistant alloy shell of the heater, some companies use additive manufacturing welding methods to produce it, melting the metal powder and depositing it layer by layer to produce a three-dimensional metal workpiece that is close to the product design size requirements. It is assisted by a small amount of mechanical processing to finally achieve the product size design requirements. This is a rapid manufacturing method with the characteristics of deposition efficiency and low cost. It can realize the rapid manufacturing of complex workpieces such as high-performance high-temperature alloys, titanium alloys, aluminum alloys, etc., greatly improving the flexibility of manufacturing.

[0004] In the existing technology, traditional additive manufacturing welding devices are often in a vacuum environment when producing high-temperature resistant alloy shells for heaters. Although this can avoid the influence of air on the surface of the workpiece, the heat continuously accumulates in the vacuum environment during the welding process, making it impossible to effectively cool the workpiece, which results in poor mechanical properties of the workpiece. Summary of the Invention

[0005] (1) Technical problems solved

[0006] In response to the shortcomings of the existing technology, the present invention provides an additive manufacturing welding method and device for a heater's high-temperature resistant alloy shell, which solves the problem that in the existing technology, heat is continuously accumulated in a vacuum environment during the welding manufacturing process, and the workpiece cannot be effectively cooled, which leads to poor mechanical properties of the workpiece.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: an additive manufacturing welding device for a high-temperature resistant alloy shell of a heater, comprising an operating table, the upper surface of the operating table is fixedly connected to a forming box, the inner bottom of the forming box is fixedly connected to a forming base, the upper surface of the forming base is provided with a receiving groove, the interior of the receiving groove is rotatably connected to a rotating hollow tube, one end of the rotating hollow tube extends to the outside of the forming box, the outer surface of the rotating hollow tube is fixedly connected to a rotating plate body, the lower surface of the rotating plate body is fixedly connected to two first cold water pipes, a plurality of second cold water pipes are fixedly connected between the two first cold water pipes, a third cold water pipe is commonly fixedly connected between the two first cold water pipes, and the outer surface of the third cold water pipe is fixedly connected to a fourth cold water pipe. The cam is connected to the rotary table by means of a guide rail, and the guide rail is provided with a first connecting block, and the side wall of the cam is fixedly connected to the guide rail. A plurality of air injection pipes are fixedly connected to the inner wall of the cam. A driving assembly for driving the rotary table to lift and lower the cam is installed on the top of the cam. An air supply assembly connected to the circular mounting pipe is installed on the upper surface of the cam. An exhaust assembly is installed on the top of the cam. An additive manufacturing welding assembly is installed on the inner top of the cam.

[0009] Preferably, the power assembly includes a fixed seat fixedly connected to the rear side of the molding box, a first servo motor is fixedly connected to the side wall of the fixed seat, the output shaft of the first servo motor is fixedly connected to a first pulley, the outer surface of the rotating hollow tube is fixedly connected to a second pulley, and the first pulley and the second pulley are connected by a belt transmission.

[0010] Preferably, the water supply assembly includes a first water pump and a second water pump fixedly connected to the upper surface of the operating table, the outlet of the first water pump is fixedly connected to a first mounting pipe, the end of the first mounting pipe away from the first water pump is rotatably connected to the rotating hollow pipe, the inlet of the second water pump is fixedly connected to a second mounting pipe, the end of the second mounting pipe away from the second water pump is fixedly connected to the first mounting pipe, and water valves are installed on the outer surfaces of the first mounting pipe and the second mounting pipe.

[0011] Preferably, the drive assembly includes a second servo motor fixedly connected to the top of the molding box, the output shaft of the second servo motor extends to the interior of the molding box and is fixedly connected to a threaded rotating rod, the end of the threaded rotating rod is rotatably connected to the inner bottom of the molding box, the outer surface of the threaded rotating rod is threadedly connected to a second connecting block, and the second connecting block is fixedly connected to the inner wall of the annular mounting tube.

[0012] Preferably, the gas supply assembly includes an inert gas generator fixedly connected to the upper surface of the operating table, the outlet of the inert gas generator is fixedly connected to an inert gas pipe, the inert gas pipe extends to the interior of the molding box at one end away from the inert gas generator and is fixedly connected to a connecting hose, and the end of the connecting hose is fixedly connected to the annular mounting tube.

[0013] Preferably, the vacuum assembly includes an vacuum pump fixedly connected to the top of the molding box, the inlet of the vacuum pump is fixedly connected to the vacuum pipe, the end of the vacuum pipe away from the vacuum pump is fixedly connected to the molding box, the outlet of the vacuum pump is fixedly connected to the second exhaust pipe, the top of the molding box is fixedly connected to the first exhaust pipe, the end of the first exhaust pipe is fixedly connected to the second exhaust pipe, and the outer surfaces of the first exhaust pipe and the second exhaust pipe are both installed with one-way valves.

[0014] Preferably, the additive manufacturing welding assembly includes a three-axis motion mechanism fixedly connected to the top of the molding box, the free end of the three-axis motion mechanism is fixedly connected to a connecting mounting plate, and a welding gun and a powder feeding pipe are installed on the connecting mounting plate.

[0015] Preferably, a sealing strip is installed on the side wall of the rotating plate body, and a sealing door is installed on the outer surface of the forming box body.

[0016] A welding method for an additive manufacturing welding device for a heater high-temperature resistant alloy shell, the welding method comprising the following steps:

[0017] S1. Before additive manufacturing welding, start the vacuum pump to extract air from the molding box through the vacuum pipe. The air is discharged through the second exhaust pipe. At the same time, start the inert gas generator. The inert gas generated by the inert gas generator enters the connecting hose through the inert gas pipe, then enters the annular mounting pipe through the connecting hose, and finally is ejected through multiple injection pipes, so that the interior of the molding box is in an inert gas atmosphere.

[0018] S2. Using additively manufactured welding components to form and manufacture the high-temperature resistant alloy shell of the heater. During the forming process, starting the first water pump to draw cold water from the outside through the first installation pipe. The cold water enters the interior of the rotating hollow tube through the first installation pipe and then enters the multiple second cold water pipes through the fourth cold water pipe to cool the workpiece. The water valve on the second installation pipe is opened regularly, the water valve on the first installation pipe is closed, and the second water pump is started to pump water out of the multiple second cold water pipes. The water is changed regularly.

[0019] S3. Start the first servo motor. The output shaft of the first servo motor rotates the first pulley, causing the rotating hollow tube to rotate the rotating plate, thereby changing the positions of the plurality of second cold water pipes to uniformly cool the surrounding area of ​​the formed workpiece.

[0020] S4. As the workpiece forming height increases, the second servo motor is started. The output shaft of the second servo motor rotates with the threaded rotating rod, causing the second connecting block to move upward with the annular mounting tube, thereby changing the height at which the inert gas is ejected from the multiple jet pipes. During the workpiece forming process, the one-way valve on the second exhaust pipe is closed, and the one-way valve on the first exhaust pipe is opened to exhaust the gas inside the forming box.

[0021] (3) Beneficial effects

[0022] The present invention provides an additive manufacturing welding method and device for a high-temperature resistant alloy shell of a heater.

[0023] It has the following beneficial effects:

[0024] 1. The present invention starts the first water pump, draws cold water from the outside through the first installation pipe, the cold water enters the interior of the rotating hollow pipe through the first installation pipe, and then enters the multiple second cold water pipes through the fourth cold water pipe to cool the workpiece, regularly opens the water valve on the second installation pipe, closes the water valve on the first installation pipe, starts the second water pump, pumps out water from the multiple second cold water pipes, regularly changes the water, starts the first servo motor, and the output shaft of the first servo motor rotates with the first pulley, so that the rotating hollow pipe rotates with the rotating plate body, changes the positions of the multiple second cold water pipes, and evenly cools the area around the formed workpiece, greatly reducing the heat around the workpiece, which is beneficial to improving the forming quality of the workpiece.

[0025] 2. According to the present invention, as the workpiece forming height increases, the second servo motor is started, and the output shaft of the second servo motor rotates with the threaded rotating rod, so that the second connecting block moves upward with the annular mounting tube, thereby changing the height at which the inert gas is ejected from the multiple jet pipes. During the workpiece forming process, the one-way valve on the second exhaust pipe is closed, and the one-way valve on the first exhaust pipe is opened to discharge the gas inside the forming box. This not only allows the interior of the forming box to be always in an inert gas atmosphere, but also allows the discharged gas to take away the heat inside the forming box. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the three-dimensional structure from a first perspective of an additive manufacturing welding device for a high-temperature resistant alloy shell of a heater provided by the present invention;

[0027] Figure 2 A schematic diagram of the stereoscopic structure from a second perspective of an additive manufacturing welding device for a high-temperature resistant alloy shell of a heater provided by the present invention;

[0028] Figure 3 A top view of an additive manufacturing welding device for a high-temperature resistant alloy shell of a heater provided by the present invention;

[0029] Figure 4 A schematic diagram of the rotating plate structure of an additive manufacturing welding device for a high-temperature resistant alloy shell of a heater provided by the present invention;

[0030] Figure 5 A sectional perspective view of a forming box of an additive manufacturing welding device for a high-temperature resistant alloy shell of a heater provided by the present invention;

[0031] Figure 6 A front cross-sectional view of a forming box of an additive manufacturing welding device for a high-temperature resistant alloy shell of a heater provided by the present invention;

[0032] Figure 7 The invention provides an additive manufacturing welding device for a high-temperature resistant alloy shell of a heater Figure 5 Enlarged view of point A in the middle.

[0033] Among them, 1. operating table; 2. forming box; 3. forming base; 4. rotating hollow tube; 5. rotating plate; 6. sealing strip; 7. first cold water pipe; 8. second cold water pipe; 9. third cold water pipe; 10. fourth cold water pipe; 11. first servo motor; 12. first water pump; 13. second water pump; 14. guide connecting rod; 15. first connecting block; 16. annular mounting pipe; 17. jet pipe; 18. inert gas generator; 19. inert gas pipeline; 20. connecting hose; 21. second servo motor; 22. threaded rotating rod; 23. three-axis motion mechanism; 24. connecting mounting plate; 25. welding gun; 26. powder feeding pipe; 27. vacuum pump; 28. vacuum pipeline; 29. ​​first exhaust pipe; 30. second exhaust pipe. DETAILED DESCRIPTION

[0034] 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.

[0035] Example:

[0036] like Figure 1-7 As shown, an embodiment of the present invention provides an additive manufacturing welding device for a high-temperature resistant alloy shell of a heater, comprising an operating table 1, the upper surface of the operating table 1 is fixedly connected to a forming box 2, the inner bottom of the forming box 2 is fixedly connected to a forming base 3, the upper surface of the forming base 3 is provided with a receiving groove, the interior of the receiving groove is rotatably connected to a rotating hollow tube 4, one end of the rotating hollow tube 4 extends to the outside of the forming box 2, the outer surface of the rotating hollow tube 4 is fixedly connected to a rotating plate 5, the lower surface of the rotating plate 5 is fixedly connected to two first cold water pipes 7, a plurality of second cold water pipes 8 are fixedly connected between the two first cold water pipes 7, a third cold water pipe 9 is fixedly connected between the two first cold water pipes 7, and the outer surface of the third cold water pipe 9 is fixedly connected to There is a fourth cold water pipe 10, the other end of the fourth cold water pipe 10 passes through the rotating plate body 5 and is fixedly connected to the rotating hollow tube 4. A power assembly for driving the rotating hollow tube 4 to rotate is installed on the rear side of the molding box body 2. The power assembly includes a fixed seat fixedly connected to the rear side of the molding box body 2, and a first servo motor 11 is fixedly connected to the side wall of the fixed seat. The output shaft of the first servo motor 11 is fixedly connected to the first pulley, and the outer surface of the rotating hollow tube 4 is fixedly connected to the second pulley. The first pulley and the second pulley are connected by a belt transmission. The first servo motor 11 and the output shaft of the first servo motor 11 rotate with the first pulley, so that the rotating hollow tube 4 rotates with the rotating plate body 5, thereby changing the positions of the plurality of second cold water pipes 8;

[0037] A water supply assembly connected to the rotating hollow tube 4 is installed on the upper surface of the operating table 1. The water supply assembly includes a first water pump 12 and a second water pump 13 fixedly connected to the upper surface of the operating table 1. The outlet of the first water pump 12 is fixedly connected to a first installation pipe. The inlet of the first water pump 12 is connected to an external cold water supply system. One end of the first installation pipe away from the first water pump 12 is rotatably connected to the rotating hollow tube 4. The inlet of the second water pump 13 is fixedly connected to a second installation pipe. The outlet of the second water pump 13 is connected to a water recovery system. One end of the second installation pipe away from the second water pump 13 is fixedly connected to the first installation pipe. Water valves are installed on the outer surfaces of the first installation pipe and the second installation pipe.

[0038] The inner wall of the forming box 2 is fixedly connected with a guide connecting rod 14, and the outer surface of the guide connecting rod 14 is movably sleeved with a first connecting block 15. An annular mounting tube 16 is fixedly connected to the side wall of the first connecting block 15, and a plurality of air injection pipes 17 are fixedly connected to the inner wall of the annular mounting tube 16. A driving assembly for driving the annular mounting tube 16 to rise and fall is installed on the top of the forming box 2. The driving assembly includes a second servo motor 21 fixedly connected to the top of the forming box 2, and the output shaft of the second servo motor 21 extends to the interior of the forming box 2 and is fixedly connected to a threaded rotating rod 22. The end of the threaded rotating rod 22 is rotatably connected to the inner bottom of the forming box 2, and the outer surface of the threaded rotating rod 22 is threadedly connected to a second connecting block, and the second connecting block is fixedly connected to the inner wall of the annular mounting tube 16;

[0039] An air supply assembly connected to the annular mounting tube 16 is mounted on the upper surface of the operating table 1. The air supply assembly includes an inert gas generator 18 fixedly connected to the upper surface of the operating table 1. The outlet of the inert gas generator 18 is fixedly connected to an inert gas pipe 19. One end of the inert gas pipe 19 away from the inert gas generator 18 extends to the interior of the molding box 2 and is fixedly connected to a connecting hose 20. The end of the connecting hose 20 is fixedly connected to the annular mounting tube 16. When the inert gas generator 18 is started, the inert gas generated by the inert gas generator 18 enters the connecting hose 20 through the inert gas pipe 19, then enters the annular mounting tube 16 through the connecting hose 20, and finally is ejected through multiple injection pipes 17.

[0040] An exhaust assembly is installed on the top of the molding box 2, and the exhaust assembly includes an exhaust pump 27 fixedly connected to the top of the molding box 2, an exhaust pipe 28 is fixedly connected to the inlet of the exhaust pump 27, an end of the exhaust pipe 28 away from the exhaust pump 27 is fixedly connected to the molding box 2, and a second exhaust pipe 30 is fixedly connected to the outlet of the exhaust pump 27. A first exhaust pipe 29 is fixedly connected to the top of the molding box 2, and the end of the first exhaust pipe 29 is fixedly connected to the second exhaust pipe 30. One-way valves are installed on the outer surfaces of the first exhaust pipe 29 and the second exhaust pipe 30;

[0041] An additive manufacturing welding assembly is installed on the inner top of the molding box 2, and the additive manufacturing welding assembly includes a three-axis motion mechanism 23 fixedly connected to the inner top of the molding box 2. The free end of the three-axis motion mechanism 23 is fixedly connected to a connecting mounting plate 24, and a welding gun 25 and a powder feeding pipe 26 are installed on the connecting mounting plate 24. A sealing strip 6 is installed on the side wall of the rotating plate body 5, and a sealing door is installed on the outer surface of the molding box 2. The sealing strip 6 is set so that when the sealing door is opened, air cannot enter the interior of the storage groove. Before opening the sealing door to remove the workpiece, keeping the rotating plate body 5 in a horizontal state can ensure the sealing of the interior of the storage groove and prevent air from being discharged from the interior of the storage groove during the subsequent rotation of the rotating plate body 5.

[0042] The present invention also includes a welding method for an additive manufacturing welding device for a heater high-temperature resistant alloy shell, the welding method comprising the following steps:

[0043] S1. Before additive manufacturing welding, start the vacuum pump 27 to extract air from the interior of the molding box 2 through the vacuum pipe 28. The air is discharged through the second exhaust pipe 30. At the same time, start the inert gas generator 18. The inert gas generated by the inert gas generator 18 enters the connecting hose 20 through the inert gas pipe 19, then enters the annular mounting pipe 16 through the connecting hose 20, and finally is ejected through the multiple injection pipes 17, so that the interior of the molding box 2 is in an inert gas atmosphere.

[0044] S2. Use additive manufacturing welding components to form and manufacture the high-temperature resistant alloy shell of the heater. During the forming process, start the first water pump 12 to draw cold water from the outside through the first installation pipe. The cold water first installation pipe enters the interior of the rotating hollow tube 4, and then enters the multiple second cold water pipes 8 through the fourth cold water pipe 10 to cool the workpiece. Regularly open the water valve on the second installation pipe, close the water valve on the first installation pipe, start the second water pump 13, pump out water from the multiple second cold water pipes 8, and regularly change the water.

[0045] S3. Start the first servo motor 11. The output shaft of the first servo motor 11 rotates the first pulley, causing the rotating hollow tube 4 to rotate with the rotating plate 5, changing the positions of the plurality of second cold water pipes 8 to uniformly cool the surrounding area of ​​the formed workpiece.

[0046] S4. As the workpiece forming height increases, the second servo motor 21 is started, and the output shaft of the second servo motor 21 rotates with the threaded rotating rod 22, so that the second connecting block moves upward with the annular mounting tube 16, changing the height at which the multiple injection pipes 17 spray inert gas. During the workpiece forming process, the one-way valve on the second exhaust pipe 30 is closed, and the one-way valve on the first exhaust pipe 29 is opened to discharge the gas inside the forming box 2.

[0047] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the statement "comprising a reference structure" does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0048] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An additive manufacturing welding device for a high-temperature resistant alloy housing of a heater, comprising an operating table (1), characterized in that: The upper surface of the operating table (1) is fixedly connected to a forming box (2), the inner bottom of the forming box (2) is fixedly connected to a forming base (3), the upper surface of the forming base (3) is provided with a receiving groove, the interior of the receiving groove is rotatably connected to a rotating hollow tube (4), one end of the rotating hollow tube (4) extends to the outside of the forming box (2), the outer surface of the rotating hollow tube (4) is fixedly connected to a rotating plate (5), the lower surface of the rotating plate (5) is fixedly connected to two first cold water pipes (7), a plurality of second cold water pipes (8) are fixedly connected between the two first cold water pipes (7), a third cold water pipe (9) is fixedly connected between the two first cold water pipes (7), the outer surface of the third cold water pipe (9) is fixedly connected to a fourth cold water pipe (10), the other end of the fourth cold water pipe (10) passes through the rotating plate (5) and is connected to the rotating hollow tube (4). The molding box (2) is fixedly connected, and a power component for driving the rotating hollow tube (4) to rotate is installed on the rear side of the molding box (2), and a water supply component connected to the rotating hollow tube (4) is installed on the upper surface of the operating table (1). The inner wall of the molding box (2) is fixedly connected to a guide connecting rod (14), and the outer surface of the guide connecting rod (14) is movably sleeved with a first connecting block (15). The side wall of the first connecting block (15) is fixedly connected to a ring-shaped mounting tube (16), and the inner wall of the ring-shaped mounting tube (16) is fixedly connected to a plurality of air injection tubes (17). The top of the molding box (2) is installed with a driving component for driving the ring-shaped mounting tube (16) to rise and fall. The upper surface of the operating table (1) is installed with an air supply component connected to the ring-shaped mounting tube (16). The top of the molding box (2) is installed with an exhaust component, and the inner top of the molding box (2) is installed with an additive manufacturing welding component.

2. The additive manufacturing welding device for a high-temperature resistant alloy shell of a heater according to claim 1, characterized in that: The power assembly includes a fixed seat fixedly connected to the rear side of the molding box (2), a first servo motor (11) is fixedly connected to the side wall of the fixed seat, an output shaft of the first servo motor (11) is fixedly connected to a first pulley, and an outer surface of the rotating hollow tube (4) is fixedly connected to a second pulley, and the first pulley and the second pulley are connected via a belt transmission.

3. The additive manufacturing welding device for a high-temperature resistant alloy shell of a heater according to claim 2, characterized in that: The water supply assembly comprises a first water pump (12) and a second water pump (13) fixedly connected to the upper surface of the operating table (1); the outlet of the first water pump (12) is fixedly connected to a first mounting pipe; one end of the first mounting pipe away from the first water pump (12) is rotatably connected to the rotating hollow pipe (4); the inlet of the second water pump (13) is fixedly connected to a second mounting pipe; one end of the second mounting pipe away from the second water pump (13) is fixedly connected to the first mounting pipe; and water valves are installed on the outer surfaces of the first mounting pipe and the second mounting pipe.

4. The additive manufacturing welding device for a high-temperature resistant alloy shell of a heater according to claim 3, characterized in that: The driving assembly comprises a second servo motor (21) fixedly connected to the top of the molding box (2); the output shaft of the second servo motor (21) extends into the interior of the molding box (2) and is fixedly connected to a threaded rotating rod (22); the end of the threaded rotating rod (22) is rotatably connected to the inner bottom of the molding box (2); the outer surface of the threaded rotating rod (22) is threadedly connected to a second connecting block, and the second connecting block is fixedly connected to the inner wall of the annular mounting tube (16).

5. The additive manufacturing welding device for a high-temperature resistant alloy shell of a heater according to claim 4, characterized in that: The gas supply assembly comprises an inert gas generator (18) fixedly connected to the upper surface of the operating table (1); the outlet of the inert gas generator (18) is fixedly connected to an inert gas pipeline (19); one end of the inert gas pipeline (19) away from the inert gas generator (18) extends to the interior of the molding box (2) and is fixedly connected to a connecting hose (20); the end of the connecting hose (20) is fixedly connected to the annular mounting pipe (16).

6. The additive manufacturing welding device for a high-temperature resistant alloy shell of a heater according to claim 5, characterized in that: The vacuum assembly comprises an air pump (27) fixedly connected to the top of the molding box (2); the inlet of the air pump (27) is fixedly connected to an air extraction pipe (28); one end of the air extraction pipe (28) away from the air pump (27) is fixedly connected to the molding box (2); the outlet of the air pump (27) is fixedly connected to a second exhaust pipe (30); the top of the molding box (2) is fixedly connected to a first exhaust pipe (29); the end of the first exhaust pipe (29) is fixedly connected to the second exhaust pipe (30); and one-way valves are installed on the outer surfaces of the first exhaust pipe (29) and the second exhaust pipe (30).

7. The additive manufacturing welding device for a high-temperature resistant alloy shell of a heater according to claim 6, characterized in that: The additive manufacturing welding assembly comprises a three-axis motion mechanism (23) fixedly connected to the top of a molding box (2), a free end of the three-axis motion mechanism (23) being fixedly connected to a connecting mounting plate (24), and a welding gun (25) and a powder feeding pipe (26) being mounted on the connecting mounting plate (24).

8. The additive manufacturing welding device for a high-temperature resistant alloy shell of a heater according to claim 7, characterized in that: A sealing strip (6) is installed on the side wall of the rotating plate body (5), and a sealing door is installed on the outer surface of the forming box body (2).

9. The welding method of the additive manufacturing welding device for a heater high temperature alloy shell according to claim 8, characterized in that: The welding method comprises the following steps: S1. Before additive manufacturing welding, the vacuum pump (27) is started to extract the air inside the molding box (2) through the vacuum pipe (28), and the air is discharged through the second exhaust pipe (30). At the same time, the inert gas generator (18) is started, and the inert gas generated by the inert gas generator (18) enters the connecting hose (20) through the inert gas pipe (19), and then enters the annular mounting pipe (16) through the connecting hose (20), and finally is ejected through the multiple injection pipes (17), so that the interior of the molding box (2) is in an inert gas atmosphere; S2. Using additive manufacturing welding components to form and manufacture the high-temperature resistant alloy shell of the heater, during the forming process, starting the first water pump (12), extracting cold water from the outside through the first installation pipe, the cold water first installation pipe enters the interior of the rotating hollow pipe (4), and then enters the plurality of second cold water pipes (8) through the fourth cold water pipe (10), cooling the workpiece, regularly opening the water valve on the second installation pipe, closing the water valve on the first installation pipe, starting the second water pump (13), extracting water from the plurality of second cold water pipes (8), and regularly changing the water; S3, starting the first servo motor (11), the output shaft of the first servo motor (11) rotates with the first pulley, so that the rotating hollow tube (4) rotates with the rotating plate (5), changing the positions of the plurality of second cold water pipes (8), and uniformly cooling the surrounding area of ​​the formed workpiece; S4. As the workpiece forming height increases, the second servo motor (21) is started, and the output shaft of the second servo motor (21) rotates with the threaded rotating rod (22), so that the second connecting block moves upward with the annular mounting tube (16), and the height at which the multiple jet pipes (17) eject the inert gas is changed. During the workpiece forming process, the one-way valve on the second exhaust pipe (30) is closed, and the one-way valve on the first exhaust pipe (29) is opened to discharge the gas inside the forming box (2).

Images