CN116213915A - An underwater solid-phase additive manufacturing device - Google Patents

Abstract

The invention discloses an underwater solid-phase additive manufacturing device which comprises an underwater dry area mechanism, a shell and an underwater welding torch mechanism, wherein the underwater dry area mechanism, the shell and the underwater welding torch mechanism are coaxially arranged. The shell is arranged above the underwater dry area mechanism. The upper half part of the underwater welding torch mechanism is arranged in the shell, and the lower half part of the underwater welding torch mechanism is arranged in the underwater dry area mechanism. The underwater dry zone mechanism can create a local dry zone in an underwater environment, the underwater welding torch mechanism can rotate at a high speed, the underwater solid-phase material addition is realized through friction heat generation, and the cooling of the underwater welding torch is realized by utilizing the water environment. The invention can efficiently develop solid-phase additive manufacturing in an underwater environment. The invention is based on creating a local dry area in an underwater environment, and solves the problems of low deposition efficiency and poor deposition layer flow caused by too fast heat dissipation of a welding torch and a deposition layer due to the water environment. The invention regulates and controls the temperature of the welding torch based on the active temperature measurement and the water in the external environment, and realizes continuous and stable solid-phase additive manufacturing in the underwater environment.

Description

An underwater solid-phase additive manufacturing device

technical field

The invention relates to the technical field of solid phase additive manufacturing, in particular to an underwater solid phase additive manufacturing device.

Background technique

The structural parts of marine engineering equipment are faced with a harsh service environment during their service, which poses a huge threat to the normal service of structural parts of marine engineering equipment. The in-situ repair of damaged parts such as scratches and wear of marine engineering equipment, especially for the in-situ repair of marine engineering equipment serving in underwater environments, can significantly improve the service performance of marine engineering equipment and prolong the service life of marine engineering equipment. Service life of equipment. Existing underwater repair technologies mainly include arc-based underwater additive repair technology and laser-based underwater additive repair technology. However, both arc-based and laser-based underwater additive repair technologies need to heat and melt the raw materials into a liquid state, and then superimpose and solidify them layer by layer. This huge temperature gradient easily leads to problems such as porosity, lack of fusion, and thermal cracks in the deposition area. It is even necessary to perform post-repair heat treatment, hot isostatic pressing, mechanical rolling and other post-treatments on the repaired area to eliminate the defects of additive repair as much as possible.

Solid phase additive manufacturing technology is a metal deposition process that uses the principles of layered accumulation and friction extrusion plastic deformation processing. Metal materials do not melt and solidify in additive manufacturing. In addition, the small temperature gradient makes the deposited layer obtained by solid phase additive manufacturing have small residual stress, and the molded parts are not easy to deform and crack, and the molded parts have forged structure characteristics and excellent mechanical properties, thus achieving high-performance additive repair has huge potential.

However, if the solid-phase additive manufacturing technology is applied to the underwater environment, the wet-based solid-phase additive manufacturing technology can increase the cooling rate of the deposited layer, but due to the existence of the water environment, the heat dissipation of the welding torch and the deposited layer is too fast. Problems such as low deposition efficiency, poor fluidity of deposited layers, and poor interlayer bonding quality. Additive manufacturing based on underwater dry methods can achieve a dry area, but it is very expensive. Additive repair technology based on partial dry method is a method that takes into account cost and creates an anhydrous environment. In addition, the welding torch rotates at a high speed during the solid-phase additive process. If the temperature of the additive deposition area is too high, the deposited material will be overly softened, forming burrs, and even thrown out of the deposition area, which will greatly affect the quality of the additive deposition.

Chinese patent 202120797168.5 discloses a welding device for underwater friction stir welding, which belongs to the field of underwater welding technology, including a water tank, one end of the water tank is provided with a water inlet, the water inlet is provided with a water inlet pipe, and the other end is provided with a water outlet , there is an outlet pipe at the water outlet, a welding backing plate and a fixture for fixing the workpiece to be welded are provided on the inside of the bottom of the tank, and a hydrogen gas collection device is installed above the welding backing plate, which is used to collect the hydrogen generated during the welding process. To eliminate the influence of hydrogen on the weld. However, the infiltration of hydrogen atoms into steel usually occurs when the metal is in a liquid phase state, and the temperature of friction stir welding has not yet reached the solidus line. Therefore, hydrogen atoms cannot diffuse into the welding area of friction stir welding.

Chinese patent 200910072037.4 discloses a stirring head suitable for partial dry friction stir welding in a water environment, which relates to a stirring head for friction stir welding. The invention utilizes a special stirring head combined with a stirring head base body and a wire brush structure to directly drain water from the welding area without requiring other drainage devices. The temperature around the stirring head is high, so that the water near it is vaporized, and the water is discharged by using the steam pressure. At the same time, the water is thrown out under the action of the centrifugal force of the synchronous rotation of the stainless steel wire bundle, and the water is prevented from flowing through the steel wire through the inverted funnel-shaped cover. The entry from the upper part and the side of the brush structure has the characteristics of simplicity and ease. However, wire-based brushes are not able to completely drain the water to form a dry zone where large water depths are involved. In addition, the amount of vaporized water vapor in the welded joint is very small, obviously unable to form a stable dry area of drainage.

Chinese patent 20192186055.7 discloses an atomization cooling device for friction stir welding equipment, including a fixed table, a flow adjustment knob, a cooling medium port, a connecting hose, a universal nozzle, a fixed plate, an air inlet, and an atomizer body , stirring head and filter gauze. The flow adjustment knob is convenient to control the output volume and output speed of the cooling medium of the atomizer main body to prevent excessive waste of cooling medium. The universal nozzle is convenient to adjust and move synchronously with the stirring head to atomize and spray the cooling medium to the stirring head and the weld seam And on the workpiece, reduce the temperature of the stirring head, and can significantly reduce the heat transferred to the spindle parts during welding. At the same time, after the cooling medium is atomized, it can effectively reduce the deformation of the workpiece after welding. Compared with high-pressure air cooling, the cooling effect is better, ensuring welding Quality, and the atomization of the cooling medium will not cause tooling to rust; the filter gauze prevents foreign matter from being ejected from the universal nozzle, which effectively improves the welding quality of the workpiece. However, this cooling method requires an additional external spraying device for unidirectional cooling outside the torch, and the cooling area is not uniform. When the spray is sprinkled on the deposition layer, it is easy to cause the bottom deposition layer to cool prematurely and lose fluidity prematurely, reducing the deposition efficiency.

Contents of the invention

The purpose of the present invention is to provide an underwater solid-phase additive manufacturing device for the defects of the prior art. The invention can carry out solid-phase additive manufacturing in an underwater environment, and has high additive efficiency and good additive manufacturing. Quality, so that the metal material does not melt and solidify, and overcomes the inevitable defects such as pores, incomplete fusion and thermal cracks in the traditional underwater melting additive process.

In order to solve the problems of the technologies described above, the present invention provides technical solutions as follows:

An underwater solid-phase additive manufacturing device, characterized in that it includes an underwater dry zone mechanism, a shell, and an underwater torch mechanism, and the underwater dry zone mechanism, the shell, and the underwater torch mechanism are coaxial Arrangement, the shell is set above the underwater dry zone mechanism, the upper end of the underwater welding torch mechanism is set in the shell, the lower end is set in the underwater dry zone mechanism, the underwater welding torch mechanism The torch mechanism can rotate around its axis at high speed, and realize the solid-phase addition of underwater metal materials through the friction between the bottom of the underwater torch mechanism and the deposition layer to generate heat. The underwater dry zone mechanism can be connected to high-pressure gas in the underwater environment Creates a localized dry zone and supports the high speed rotation of the underwater torch mechanism.

Further, the underwater dry area mechanism includes a dry area mechanism body, an air intake channel, a central channel, and an air intake pipe, the air intake channel is arranged through the dry area mechanism body, and its upper end is connected to the air intake pipe, The lower end is connected to the local dry area below the main body of the dry area mechanism, the central passage is set through the axis of the main body of the dry area mechanism, and the underwater welding torch mechanism is coaxially connected in the central passage.

Further, the upper end of the dry area mechanism body is provided with a top boss, and the housing is connected to the dry area mechanism body through the top boss.

Further, the air intake channels are distributed in a ring with the center of the dry zone mechanism body as the axis.

Further, the underwater welding torch mechanism includes a coaxial central rod, a working shell, a plane bearing, a partition sleeve, and a central sleeve, and the inner shaft of the working shell is provided with an inner hole and a bar channel, the junction of the inner hole and the bar material channel forms an inner step, the plane bearing is arranged on the inner step, the partition sleeve is arranged on the plane bearing in the inner hole, the A central sleeve is disposed within the partition sleeve, and the central bar is disposed within the central sleeve and the bar channel.

Further, the baffle sleeve includes a cylindrical baffle and a top step arranged on the upper end of the cylindrical baffle, the top step is provided with a water inlet and a water outlet, and the water inlet communicates with the The inner side and the torch water cooling device, the water outlet communicates with the outer side of the cylindrical partition and the torch water cooling device, the bottom of the cylindrical partition is provided with a bottom through hole, and the cooling water can pass through the water inlet from the welding torch water cooling device in sequence , the inner side of the cylindrical partition, the through hole at the bottom, the outer side of the cylindrical partition, and the water outlet return to the torch water cooling device.

Further, a top dynamic seal is provided between the top step and the working housing, and a plane bearing seal is provided between the plane bearing and the working housing.

Further, a central bearing is connected between the working casing and the body of the dry zone mechanism, and a central bearing seal is provided at the lower end of the central bearing.

Further, the torch water cooling device is arranged in the housing, including a water inlet pipe, a frequency conversion water pump, a water outlet pipe, and a one-way valve. One end of the water inlet pipe is connected to a cooling water source, and the other end is connected to the underwater welding torch. The water inlet of the mechanism, one end of the water outlet pipe is connected to the water outlet of the underwater torch mechanism, and the other end is connected to the external water environment, the frequency conversion water pump is arranged on the water inlet pipe, and the one-way valve is arranged on the water outlet pipe .

Further, the lower end of the body of the dry zone mechanism is provided with a temperature sensor, which can monitor and feed back the temperature at the bottom of the underwater torch mechanism to the variable frequency water pump in real time.

Compared with prior art, the beneficial effect of the present invention is:

1. The present invention can perform in-situ, high-efficiency, high-performance repair and additive manufacturing of marine engineering components in the marine environment. During the additive manufacturing process, the metal material does not melt and solidify, the residual stress is small, and the additive deposition layer is not easy to crack. It overcomes the inevitable defects of porosity, lack of fusion and thermal cracks in the traditional underwater melting additive manufacturing technology. It avoids post-processing such as heat treatment, hot isostatic pressing, and mechanical rolling to improve performance, and it is convenient and fast to additively manufacture high-performance deposition parts in an underwater environment.

(2) The present invention uses an underwater dry area mechanism to create a local dry area, which can avoid the low deposition efficiency caused by the rapid heat dissipation of the welding torch and the deposited layer caused by the water environment, the poor fluidity of the deposited layer, and the reduction of the forming quality of the deposited layer. At the same time, based on the use of inert gas drainage, an inert gas protective atmosphere can be formed, so that easily oxidizable non-ferrous metals can be manufactured in an underwater environment by solid phase additive.

(3) The present invention controls the working temperature of the underwater welding torch by measuring and adjusting the flow rate of the frequency conversion water pump in real time. It overcomes the problem that the deposition material is too softened due to the high temperature of the underwater torch, forming flashes, or even being thrown out of the deposition area, and greatly improves the forming accuracy and forming performance of the underwater solid phase additive.

(4) The present invention takes away the heat generated by the welding torch through the internal welding torch water cooling device, thereby cooling the underwater welding torch evenly, avoiding the excessive temperature difference in the processing area caused by uneven local cooling, and improving the solid phase additive quality. At the same time, water from the external environment is used for cooling, avoiding the use of refrigerants and compressors, reducing refrigeration costs and simplifying the cooling system.

Description of drawings

1 is a schematic diagram of the overall structure of an embodiment of the present invention;

Fig. 2 is the schematic structural diagram of the working shell of the embodiment of the present invention;

Fig. 3 is a schematic diagram of the structure of the separator sleeve according to the embodiment of the present invention.

Among them: 100-underwater dry area mechanism; 101-intake channel; 102-central channel; 103-intake pipe; 104-top boss; 105-temperature sensor; 106-central bearing; 107-central bearing seal; 108- Dry area mechanism body; 200-housing; 202-frequency conversion pump; 203-inlet pipe; 204-outlet pipe; 205-one-way valve; 300-underwater welding torch mechanism; 321-bar channel; 322-inner step; 323-inner hole; 324-outer channel; 325-inner channel; 330-plane bearing; 331-plane bearing seal; 340-baffle sleeve; 341-bottom Through hole; 342-cylindrical partition; 344-top step; 345-water outlet; 346-water inlet; 347-top dynamic seal; 350-central sleeve; 400-deposition layer.

Detailed ways

In order to deepen the understanding of the present invention, we will further describe the present invention in conjunction with the accompanying drawings below. This embodiment is only used to explain the present invention and does not constitute a limitation to the protection scope of the present invention.

1-3 show an embodiment of an underwater solid-phase additive manufacturing device, including an underwater dry zone mechanism 100 , a housing 200 and an underwater welding torch mechanism 300 .

The underwater dry zone mechanism 100, the casing 200 and the underwater welding torch mechanism 300 are coaxially arranged. The casing 200 is disposed above the underwater dry zone mechanism 100 . The upper half of the underwater torch mechanism 300 is set inside the housing 200 , and the lower half of the underwater torch mechanism 300 is set in the underwater dry zone mechanism 100 . The underwater dry area mechanism 100 can create a local dry area in the underwater environment. The underwater torch mechanism 300 can rotate around the axis of the underwater dry area mechanism 100 and the shell 200 at high speed, and realize underwater solid phase growth through frictional heat generation. materials and use the water environment to achieve its own cooling.

The underwater dry zone mechanism 100 includes a dry zone mechanism body 108 , an air intake pipe 103 , a central bearing 106 , a central bearing seal 107 , a temperature sensor 105 , an air intake channel 101 , a central channel 102 and a top boss 104 . The underwater dry zone mechanism 100 can be connected with high-pressure gas, thereby creating a local dry zone in the underwater environment, and can support the high-speed rotation of the underwater welding torch mechanism 300 at the same time.

The intake passage 101 is a plurality of through holes arranged in a ring along the axis of the central passage 102 , and the intake pipe 103 is connected to the top of the intake passage 101 . The high-pressure inert gas passes through the intake pipe 103, passes through the intake channel 101, enters the dry area mechanism body 108, and then sprays out water from the bottom of the dry area mechanism body 108, thereby creating a local dry area in the underwater environment. In addition, the inert gas protection atmosphere can also prevent the oxidation of active metals in solid phase additive manufacturing.

The central bearing 106 is arranged concentrically with the central passage 102 , and the outer ring of the central bearing 106 has the same diameter as the central passage 102 . The underwater welding torch mechanism 300 is disposed inside the center bearing 106 . The center bearing seal 107 is disposed below the center bearing 106 . The underwater welding torch mechanism 300 rotates at high speed during operation, and the inner ring of the central bearing 106 rotates synchronously with the underwater welding torch mechanism 300 . The outer ring of the central bearing 106 and the central channel 102 are relatively stationary. The central bearing seal 107 is a high temperature resistant annular dynamic seal, which can ensure the rotary dynamic seal of the underwater welding torch mechanism 300 at high working temperature, and the central bearing seal 107 and the central channel 102 are relatively stationary.

The housing 200 is connected to the dry area mechanism body 108 through the top boss 104 , and the dry area mechanism body 108 and the housing 200 are relatively stationary.

The temperature sensor 105 is arranged inside the body 108 of the dry zone mechanism, and the temperature sensor 105 can monitor and feed back the temperature at the bottom of the underwater welding torch mechanism 300 in real time.

The casing 200 includes a frequency conversion water pump 202 , a water inlet pipe 203 , a water outlet pipe 204 , and a one-way valve 205 .

One end of the water inlet pipe 203 is connected to the cooling water source, the other end is connected to the water inlet 346 of the underwater welding torch mechanism, one end of the water outlet pipe 204 is connected to the water outlet 345 of the underwater welding torch mechanism, and the other end is connected to the external water environment. The frequency conversion water pump 202 is arranged on On the water inlet pipe 203 , a one-way valve 205 is arranged on the water outlet pipe 204 .

The frequency conversion water pump 202 can drive the cooling water from the external environment into the underwater welding torch mechanism 300 through the water inlet pipe 203 . Then the water inside the underwater welding torch mechanism 300 can be discharged into the external water environment through the water outlet pipe 204 and the one-way valve 205 , so as to realize heat dissipation of the underwater welding torch mechanism 300 .

Preferably, the variable frequency water pump 202 can receive data from the temperature sensor 105, and adjust the output water flow rate of the variable frequency water pump 202, so as to control the temperature of the underwater welding torch mechanism 300 to stabilize within the optimal working range.

The underwater torch mechanism 300 includes a working housing 320 , a plane bearing 330 , a bulkhead sleeve 340 , a center sleeve 350 and a center bar 310 . The working shell 320, the plane bearing 330, the partition sleeve 340, the central sleeve 350, and the central bar 310 are arranged coaxially. The working shell 320 can rotate at high speed along its own axis, so that heat is generated by friction at the contact surface between the bottom of the torch 300 and the deposition layer 400 , heating and softening the central rod 310 to the plastic flow zone. The underwater welding torch mechanism 300 can also take away excess heat through the internal water circulation in time to prevent the temperature of the underwater welding torch mechanism 300 from being too high.

A rod channel 321 and an inner hole 323 are arranged inside the working shell 320 , and an inner step 322 is formed at the junction of the inner hole 323 and the bar channel 321 . The plane bearing 330 is disposed on the inner step 322 , and the outer diameter of the plane bearing 330 is slightly smaller than the diameter of the inner hole 323 .

The diameter of the inner ring of the plane bearing 330 is the same as the outer diameter of the center sleeve 350 , and the inner ring of the plane bearing 330 and the center sleeve 350 are relatively stationary. The bottom of the center sleeve 350 is connected with the plane bearing 330 . The plane bearing 330 and the inner hole 323 are sealed by the plane bearing seal 331. When the working shell 320 rotates, the plane bearing seal 331 and the inner hole 323 move relative to each other, and the plane bearing seal 331 and the plane bearing 330 are relatively stationary.

The lower surface of the plane bearing 330 can rotate synchronously with the working casing 320 at a high speed, and the upper surface of the plane bearing 330 can remain stationary during the high-speed rotation of the working casing 320 .

The central sleeve 350 is a long cylindrical sleeve with a through hole inside, and the inner diameter of the central sleeve 350 is the same as the inner diameter of the rod channel 321 .

The partition sleeve 340 includes a cylindrical partition 342 and a top step 344 disposed on the upper end of the cylindrical partition 342 . The bottom through hole 341 provided at the bottom of the cylindrical partition 342 is a plurality of semicircular through holes arranged circularly along the axis of the partition sleeve 340 . The outer diameter of the cylindrical partition 342 is smaller than the diameter of the inner hole 323 on the working casing 320 , and the inner diameter of the cylindrical partition 342 is larger than the diameter of the central sleeve 350 . The bottom of the cylindrical partition 342 is disposed on the plane bearing 330 . The outer diameter of the top step 344 is smaller than the diameter of the inner hole 323 , and the top step 344 and the inner hole 323 are sealed by a top dynamic seal 347 . The top dynamic seal 347 moves relative to the working casing 320 , and the top dynamic seal 347 and the top step 344 are relatively stationary.

An inner passage 325 is formed between the inner wall of the cylindrical partition 342 and the outer wall of the central sleeve 350, an outer passage 324 is formed between the outer wall of the cylindrical partition 342 and the inner hole 323, and an outer passage 324 is formed between the inner passage 325 and the outer passage 324. communicate through the bottom through hole 341 . The inner diameter of the top step 344 is the same as the outer diameter of the central sleeve 350. The top step 344 is provided with a water inlet 346 and a water outlet 345. The water inlet 346 communicates with the inner channel 325, and the water outlet 345 communicates with the outer channel 324. The cooling water can enter the inner channel 325 through the water inlet 346 , and then flow down to the bottom of the inner hole 323 under the action of gravity, and enter the outer channel 324 through the bottom through hole 341 . The water in the outer channel 324 is discharged through the water outlet 345 to take away the heat of the underwater welding torch mechanism 300 .

The center bar 310 can pass through the center sleeve 350 and the bar channel 321 to the processing area at the bottom of the working housing 320 . An upsetting force is applied to the upper end of the center bar 310, so that the center bar 310 can be sent down to the processing area to realize additive manufacturing deposition.

The movement of the casing 200 is controlled by an underwater motion control mechanism, such as an underwater three-axis machine tool, an underwater robot, etc.; based on the motion trajectory generated by three-dimensional modeling, and with appropriate process parameters, after a layer is deposited and raised to a certain height Continue to deposit the next layer, so as to realize the solid phase additive manufacturing layer by layer in the underwater environment.

Argon gas with a purity of 99.99% is used as the high-pressure inert gas. The high-pressure inert gas enters the interior of the underwater dry area mechanism 100 through the intake pipe 103 and the air intake channel 101, and then sprays out water from the bottom of the underwater dry area mechanism 100 to form a local dry area. district. The underwater welding torch mechanism 300 rotates at a high speed and the underwater welding torch mechanism 300 has an appropriate operating temperature based on water cooling control. The central bar 310 is an easily oxidizable magnesium alloy bar, and by applying an upsetting force to the magnesium alloy bar, the solid phase additive manufacturing technology is realized in an underwater environment.

Nitrogen with a purity of 99.99% can also be used as the high-pressure inert gas. The high-pressure inert gas enters the interior of the underwater dry area mechanism 100 through the inlet pipe 104 and the air inlet channel 101, and then sprays out water from the bottom of the underwater dry area mechanism 100 to form a local dry area. The underwater welding torch mechanism 300 rotates at a high speed and the underwater welding torch mechanism 300 has an appropriate operating temperature based on water cooling control. The central bar 310 uses a 7075 aluminum alloy bar, and by applying an upsetting force to the 7075 aluminum alloy bar, the solid phase additive manufacturing technology is realized in an underwater environment.

Among them, the rotating speed of the underwater torch mechanism 300 is 400-1000r/min, the scanning speed is 300-600mm/min, the diameter of the center bar 310 is 15-25mm, and the feeding speed of the center bar 310 is 60-120mm/min, The thickness of a single layer is 2-4mm.

The above-mentioned specific implementation is only to illustrate the technical concept and structural features of the present invention, and the purpose is to allow relevant persons familiar with this technology to implement it accordingly, but the above content does not limit the scope of protection of the present invention. Any equivalent change or modification made in essence shall fall within the protection scope of the present invention.

Claims (10)

1. An underwater solid-phase additive manufacturing device, characterized in that: comprising an underwater dry zone mechanism (100), a housing (200), an underwater welding torch mechanism (300), the underwater dry zone mechanism ( 100), the housing (200) and the underwater welding torch mechanism (300) are coaxially arranged, the housing (200) is arranged above the underwater dry area mechanism (100), and the underwater welding torch mechanism The upper end of (300) is set in the housing (200), the lower end is set in the underwater dry area mechanism (100), and the underwater welding torch mechanism (300) can rotate around its axis at high speed, The underwater metal material solid-phase additive is realized by frictional heat generation between the bottom of the underwater torch mechanism (300) and the deposition layer (400), and the underwater dry zone mechanism (100) can access high-pressure gas to manufacture local dry zone and supports the high speed rotation of the underwater torch mechanism (300). 2. An underwater solid-phase additive manufacturing device according to claim 1, characterized in that: the underwater dry area mechanism (100) includes a dry area mechanism body (108), an air intake channel (101), a central channel (102), air intake pipe (103), the air intake channel (102) is arranged through the body of the dry area mechanism (108), its upper end is connected to the air intake pipe (103), and its lower end is connected to the body of the dry area mechanism (108) below the local dry area, the central passage (102) is arranged through the axis of the dry area mechanism body (108), and the underwater welding torch mechanism (300) is coaxially connected in the central passage. 3. An underwater solid-phase additive manufacturing device according to claim 2, characterized in that: the upper end of the dry zone mechanism body (108) is provided with a top boss (104), and the housing (200) It is connected with the dry area mechanism body (108) through the top boss (104). 4 . The underwater solid-phase additive manufacturing device according to claim 2 , characterized in that: the air intake channels ( 101 ) are distributed in a ring with the center of the dry zone mechanism body ( 108 ) as the axis. 5. An underwater solid-phase additive manufacturing device according to claim 1, characterized in that: the underwater torch mechanism (300) includes a coaxially arranged center bar (310), a working shell (320) , planar bearing (330), partition sleeve (340), center sleeve (350), the internal shaft center of the working shell (320) is provided with an inner hole (323) and a bar material passage (321), so The junction of the inner hole (323) and the bar passage (321) forms an inner step (322), the plane bearing (330) is arranged on the inner step (322), and the partition sleeve ( 340) is set on the plane bearing (330) in the inner hole (323), the center sleeve (350) is set in the partition sleeve (340), and the center bar (310) is set in Inside the center sleeve (350) and bar stock channel (321). 6. An underwater solid-phase additive manufacturing device according to claim 5, characterized in that: the baffle sleeve (340) comprises a cylindrical baffle (342) and is arranged on the cylindrical baffle (342). The top step (344) at the upper end is provided with a water inlet (346) and a water outlet (345) on the top step (344), and the water inlet (346) communicates with the inner side of the cylindrical partition (342) and the welding Torch water cooling device, the water outlet (345) communicates with the outside of the cylindrical partition (342) and the torch water cooling device, the bottom of the cylindrical partition (342) is provided with a bottom through hole (341), and the cooling water can Return to the torch water cooling device from the torch water cooling device through the water inlet (346), the inner side of the cylindrical partition (342), the bottom through hole (341), the outer side of the cylindrical partition (342), and the water outlet (345). 7. An underwater solid-phase additive manufacturing device according to claim 6, characterized in that: a top dynamic seal (347) is provided between the top step (344) and the working shell (320), and the plane A plane bearing seal (331) is arranged between the bearing (330) and the working casing (320). 8. An underwater solid-phase additive manufacturing device according to claim 7, characterized in that: a central bearing (106) is connected between the working shell (320) and the dry zone mechanism body (108), and the The lower end of the center bearing (106) is provided with a center bearing seal (107). 9. An underwater solid-phase additive manufacturing device according to claim 8, characterized in that: the torch water cooling device is arranged in the housing (200), including a water inlet pipe (203), a frequency conversion water pump ( 202), a water outlet pipe (204), a one-way valve (205), one end of the water inlet pipe (203) is connected to a cooling water source, and the other end is connected to the water inlet (346) of the underwater welding torch mechanism (300). One end of the water outlet pipe (204) is connected to the water outlet (345) of the underwater welding torch mechanism (300), and the other end is connected to the external water environment, and the frequency conversion water pump (202) is arranged on the water inlet pipe (203). The one-way valve (205) is arranged on the water outlet pipe (204). 10. An underwater solid-phase additive manufacturing device according to claim 9, characterized in that: a temperature sensor (105) is provided at the lower end of the dry zone mechanism body (108), capable of real-time monitoring and feedback of the water The temperature at the bottom of the lower torch mechanism (300) is given to the frequency conversion water pump (202).

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