Friction stir additive device and friction stir additive equipment

Abstract

The utility model relates to the technical field of friction stir additive materials, in particular to a friction stir additive material device and friction stir additive equipment, which comprise a friction stir unit, a laser unit and a first air supply unit, the friction stir unit comprises a first stirring shaft body and a second stirring shaft body, the first stirring shaft body is hollow along the axial direction to form a laser channel, and the second stirring shaft body is hollow along the axial direction to form a second air supply unit. The second stirring shaft body is hollow along the axial direction of the second stirring shaft body and is sleeved outside the first stirring shaft body; a first material channel is formed between the inner wall of the second stirring shaft body and the outer wall of the first stirring shaft body; the laser unit comprises a laser assembly, the laser assembly is coaxially connected with the friction stir unit, and the laser assembly is configured to be capable of emitting laser to the laser channel so as to provide additive assistance for the friction stir unit through the laser; a laser gap is formed between the laser assembly and the feeding end of the first material channel. The first gas supply unit is configured to be capable of conveying gas to the laser gap. According to the device, efficient and high-quality material adding can be achieved, and the space utilization rate of the device is high.

Description

Technical Field

[0001] The utility model relates to the technical field of friction stir additive manufacturing, in particular to a friction stir additive manufacturing device and a friction stir additive manufacturing equipment. Background Art

[0002] Additive manufacturing, also known as 3D printing, has become an important process in product manufacturing due to its high flexibility, unlimited customization ability, and rapid response to complex geometries. It is widely used in fields such as automotive, marine, aerospace, and military. In recent years, friction stir additive manufacturing, a new branch of metal additive manufacturing that has developed rapidly based on the principle of friction stir welding, has gradually become known in the market. It uses a high-speed rotating stirring head to extrude metal, introduce raw materials at the same time, and cause significant plastic deformation in the material within the stirring zone to adhere to the substrate. This process does not involve any melting, and solid-phase connection is achieved under the extrusion of the shoulder of the stirring head. Compared with other metal additive manufacturing technologies, it has less heat input and greater working area pressure, which can effectively weaken problems such as pores, hot cracks, residual stress, and alloy element burning loss, and has broad application prospects in the additive manufacturing field of large components of light alloys such as aluminum alloys and magnesium alloys.

[0003] In the existing friction stir additive manufacturing methods, heat is mainly generated by the friction between the stirring head and the workpiece to soften the base material and consumables and form a connection. During operation, a large upsetting force, rotational speed, and torque need to be applied to obtain enough heat to soften the material. When facing high-melting-point metals such as iron-based alloys, titanium alloys, and nickel-based alloys, the existing friction stir additive manufacturing devices are difficult to meet the production requirements, resulting in problems such as low additive manufacturing efficiency and poor finished product quality. There are also external auxiliary devices, such as resistance heating and induction heating devices, to provide heat sources to assist friction stir additive manufacturing. Although the requirements of efficiency and quality are met, there are also problems such as large volume, inability to handle complex paths, and oxidation of the deposited layers. Summary of the Utility Model

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the difficulty of the existing friction stir additive manufacturing device in balancing the additive manufacturing efficiency, additive manufacturing quality, and high space utilization rate of high-melting-point materials, and provide a friction stir additive manufacturing device and a friction stir additive manufacturing equipment that can achieve high-efficiency and high-quality additive manufacturing and have high space utilization rate of the device.

[0005] In a first aspect, the present utility model provides a friction stir additive manufacturing device, including a friction stir unit. The friction stir unit includes a first stirring shaft body and a second stirring shaft body. The first stirring shaft body is hollow along its own axial direction to form a laser channel. The second stirring shaft body is hollow along its own axial direction and sleeved outside the first stirring shaft body. A first material channel is formed between the inner wall of the second stirring shaft body and the outer wall of the first stirring shaft body; a laser unit, the laser unit includes a laser component, the laser component is coaxially connected to the friction stir unit, and the laser component is configured to be able to emit laser light passing through the laser channel to provide additive manufacturing assistance for the friction stir unit through the laser; a laser gap is formed between the laser component and the feeding end of the first material channel; a first gas supply unit, the first gas supply unit is configured to be able to supply gas to the laser gap.

[0006] In an embodiment of the present utility model, the laser component includes a laser body and a protective housing. The protective housing is connected to the laser body. A protective cavity is opened in the protective housing. A laser through hole and a first ventilation hole communicating with the protective cavity are opened on the protective housing; the laser light emitted by the laser body enters the laser channel from the laser through hole; the air outlet end of the first gas supply unit communicates with the protective cavity through the first ventilation hole.

[0007] In an embodiment of the present utility model, the laser body includes a laser housing, a laser outputter, and a laser lens. A laser cavity is provided in the laser housing. The output end of the laser outputter communicates with the laser cavity. The laser outputter is used to emit laser light. The laser lens is arranged in the laser cavity. The laser lens is used to focus the laser light emitted by the laser outputter so that the laser light passing through the laser channel is coaxial with the laser channel.

[0008] In an embodiment of the present utility model, a laser liquid cooling unit is further included. A liquid cooling flow channel is opened on the laser housing, and the liquid cooling flow channel communicates with the laser liquid cooling unit.

[0009] In an embodiment of the present utility model, the laser unit further includes a laser connecting piece. The laser connecting piece is respectively connected to the laser component and the friction stir unit to adjust the distance of the laser light emitted by the laser component through the laser connecting piece so that the focus of the laser light acts on the working surface.

[0010] In an embodiment of the present utility model, the second stirring shaft body is configured to be able to rotate relative to the first stirring shaft body, and a spiral member is provided on the inner wall of the second stirring shaft body.

[0011] In an embodiment of the present utility model, the friction stir unit further includes a stir housing. The stir housing is hollow along its own axis and sleeved outside the second stir shaft body. An air flow cavity is formed between the inner wall of at least part of the stir housing and the outer wall of the second stir shaft body. A through second ventilation hole is provided on the stir housing, and the second ventilation hole communicates with the air flow cavity. The second ventilation hole is configured to be able to input inert gas into the air flow cavity.

[0012] In an embodiment of the present utility model, the stir housing is bent towards the second stir shaft body on the side close to the discharge end of the first material channel to form a blocking portion. An air flow gap is formed between the blocking portion and the outer wall of the second stir shaft body, and the air flow gap communicates with the air flow cavity.

[0013] In an embodiment of the present utility model, the friction stir unit further includes a laser heat insulation member, and the laser heat insulation member at least covers the inner wall of the first stir shaft body.

[0014] In a second aspect, the present utility model further provides a friction stir additive manufacturing device, including a driving device and the friction stir additive manufacturing device described in any one of the above. The driving end of the driving device is connected to the friction stir additive manufacturing device.

[0015] The above technical solutions of the present utility model have the following beneficial effects compared with the prior art:

[0016] In the friction stir additive manufacturing device of the present utility model, a laser channel is provided on the first stir shaft body, and a laser component is provided to emit laser. The laser provides heat for the powder material during the friction stir process. First, the friction stir unit and the laser unit are coaxially arranged, which can effectively reduce the volume of the device, improve the space utilization rate, and facilitate the device to cope with complex working paths and prevent interference between the device and other components when moving along the path. Secondly, the introduction of the laser unit provides more heat for the working area, which can not only facilitate the rapid plasticization of the powder material to improve production efficiency, but also ensure that the powder material and the base material are fully plasticized and fused, and even metallurgically joined, so as to obtain an excellent and dense stacking layer and ensure the high quality of the finished product. Finally, the first gas supply unit can supply gas to the laser gap during the working process, avoid the scattered dust from affecting the passage of the laser, ensure the normal operation of the laser component, and extend its service life to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to make the content of the present utility model easier to be clearly understood, the following further details the present utility model according to the specific embodiments of the present utility model and in conjunction with the drawings, where

[0018] Figure 1 is a schematic structural diagram of the friction stir additive manufacturing device in the preferred embodiment of the present utility model;

[0019] Figure 2 This is a schematic cross-sectional structure diagram of the friction stir additive manufacturing device in the preferred embodiment of the present utility model;

[0020] Figure 3 This is a partial cross-sectional structure diagram of the friction stir unit in the preferred embodiment of the present utility model;

[0021] Figure 4 This is a partial cross-sectional structure diagram of the stirring housing in the preferred embodiment of the present utility model.

[0022] Explanation of the reference numerals in the specification drawings: 10, friction stir unit; 11, first stirring shaft body; 111, laser channel; 112, laser heat insulation member; 12, second stirring shaft body; 121, spiral member; 122, stirring head; 1221, discharge channel; 13, first material channel; 14, stirring housing; 141, second ventilation hole; 142, blocking portion; 1421, air flow gap; 15, air flow chamber; 16, stirring heat insulation component; 20, laser unit; 211, laser body; 2111, laser housing; 21111, liquid cooling flow channel; 2112, laser outputter; 2113, laser lens; 212, protection housing; 2121, protection chamber; 2122, laser through hole; 2123, first ventilation hole; 22, laser gap; 23, laser connecting member. Detailed implementation manners

[0023] The following further describes the present utility model in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and be able to implement it, but the examples given are not intended to limit the present utility model.

[0024] Refer to Figure 1 and Figure 2 As shown, the present utility model discloses a friction stir additive manufacturing device, including a friction stir unit 10, a laser unit 20 and a first air supply unit.

[0025] The friction stir unit 10 is used to achieve friction stir. Specifically, the friction stir unit 10 includes a first stir shaft body 11 and a second stir shaft body 12. The first stir shaft body 11 is hollow along its own axis to form a laser channel 111, so as to facilitate the laser emitted by the laser unit 20 to pass through, realizing synchronous auxiliary heating of the powder material; the space utilization rate is high, effectively reducing the volume of the device and facilitating the device to cope with complex paths. The second stir shaft body 12 is hollow along its own axis and sleeved outside the first stir shaft body 11. A first material channel 13 is formed between the inner wall of the second stir shaft body 12 and the outer wall of the first stir shaft body 11 to convey the powder material for friction stir. Those skilled in the art can set the first stir shaft body 11 and the second stir shaft body 12 according to actual needs. For example, one of them is rotated relative to the other to achieve the corresponding friction stir, which will not be elaborated here.

[0026] The laser unit 20 is used to assist the friction stir unit 10 to achieve friction stir. Specifically, the laser unit 20 includes a laser assembly, and the laser assembly is connected to the friction stir unit 10; preferably, the two are coaxially arranged. The coaxial arrangement and in-situ coupling structure form of the laser unit 20 and the friction stir unit 10 can effectively reduce the volume of the device, improve the space utilization rate, facilitate the device to cope with complex working paths, and prevent interference between the device and other components when moving along the path. Among them, in-situ coupling means that the heat of the friction stir unit 10, the heat of the laser, the powder material convergence point, and the substrate fusion area are at the same point. The laser assembly is configured to be able to emit laser light that passes through the laser channel 111 to provide additive assistance for the friction stir unit 10 through the laser. The laser has a high energy density, a high heat generation efficiency, can be quickly cooled and heated, and is very clean and convenient. By setting this structure, the heat demand of high-melting-point metals is effectively met, and at the same time, the synchronous heating structure through the laser channel 111 also effectively overcomes the problem of easy oxidation of the stacking layer in the non-synchronous auxiliary heating structure in the prior art, ensuring the high quality of the finished product. A laser gap 22 is formed between the laser assembly and the feeding end of the first material channel 13; specifically, compared with integrally connecting the laser assembly and the first stir shaft body 11, setting the laser gap 22 to connect them in a split manner can reduce costs and facilitate assembly and debugging. However, correspondingly, the split structure also brings problems, that is, when feeding the powder material into the first material channel 13, the powder material is easily scattered and pollutes the laser assembly, affecting the passage of the laser and causing damage to the laser assembly.

[0027] For this purpose, a first gas supply unit is provided to supply gas to the laser gap 22 through the first gas supply unit, so as to blow away the scattered dust, ensure that the laser can smoothly enter the laser channel 111, and provide heat for the powder material during friction stir welding. By setting this structure, the normal operation of the laser assembly can be ensured, and the situation that the corresponding lens of the laser assembly is burned due to laser blockage can be avoided, and its service life is extended to a certain extent. The first gas supply unit belongs to the prior art and is not shown in the drawings. Although the first gas supply unit also occupies a certain space, the first gas supply unit does not have to be integrally integrated on the device, and it can realize the gas transmission through pipelines, so the overall space utilization rate of the device can still be ensured.

[0028] During actual use, powder material is fed into the first material channel 13 to realize friction stir additive manufacturing through the corresponding stirring shaft body. During the friction stir additive manufacturing process, the laser assembly is turned on to emit laser, and the laser enters the laser channel 111 to provide auxiliary heat for the powder material. At the same time, the first gas supply unit works to supply gas to the laser gap 22 to prevent the powder material from drifting towards the laser assembly and ensure that the laser smoothly enters the laser channel 111.

[0029] In the friction stir additive manufacturing device of the present utility model, a laser channel 111 is opened on the first stirring shaft body 11, and a laser assembly is provided to emit laser, and the laser provides heat for the powder material during the friction stir process through the laser channel 111. First, the friction stir unit 10 and the laser unit 20 are coaxially arranged, which can effectively reduce the volume of the device, improve the space utilization rate, facilitate the device to cope with complex working paths, and prevent interference between the device and other components when moving along the path. Secondly, the introduction of the laser unit can provide more heat for the working area, which can not only facilitate the rapid plasticization of the powder material to improve production efficiency, but also ensure that the powder material and the base material are fully plasticized and fused, and even metallurgically joined, so as to obtain an excellent and dense deposition layer and ensure the high quality of the finished product. Finally, the first gas supply unit can supply gas to the laser gap 22 during the working process to prevent the scattered dust from affecting the passage of the laser, ensure the normal operation of the laser assembly, and extend its service life to a certain extent.

[0030] Refer to Figure 1 and Figure 2As shown, in some embodiments of the friction stir additive manufacturing device of the present utility model, the laser assembly includes a laser body 211 and a protective housing 212. The protective housing 212 is connected to the laser body 211. A protective cavity 2121 is formed in the protective housing 212. A laser through hole 2122 and a first ventilation hole 2123 communicating with the protective cavity 2121 are formed in the protective housing 212. The laser emitted by the laser body 211 enters the laser channel 111 through the laser through hole 2122; the air outlet end of the first air supply unit communicates with the protective cavity 2121 through the first ventilation hole 2123. By providing the protective housing 212, while realizing the laser-assisted friction stir function, it can effectively protect the lens of the laser body 211, reduce the possibility of dust contaminating the lens, and thus extend the service life of the device.

[0031] Further, referring to Figure 2 As shown, in some embodiments of the friction stir additive manufacturing device of the present utility model, the laser body 211 includes a laser housing 2111, a laser outputter 2112, and a laser lens 2113. A laser cavity is provided in the laser housing 2111. The output end of the laser outputter 2112 communicates with the laser cavity. The laser outputter 2112 is used to emit laser. The laser lens 2113 is disposed in the laser cavity. The laser lens 2113 is used to focus the laser emitted by the laser outputter 2112 so that the laser passing through the laser channel 111 is coaxial with the laser channel 111. By providing a coaxial structure, each stirring shaft body, the stirring head 122, the material powder, and the laser can be on the same axis to have better coupling. The structure of the laser body 211 belongs to the prior art. By providing this structure, laser can be emitted to assist friction stir. Those skilled in the art can set the laser outputter 2112 according to actual needs. For example, it includes a connected optical fiber and a collimator; those skilled in the art can set the corresponding number of laser lenses 2113 according to actual needs, which will not be elaborated here.

[0032] Further, referring to Figure 2 As shown, in some embodiments of the friction stir additive manufacturing device of the present utility model, it further includes a laser liquid cooling unit. A liquid cooling flow channel 21111 is formed in the laser housing 2111. The liquid cooling flow channel 21111 communicates with the laser liquid cooling unit. The laser liquid cooling unit belongs to the prior art and is not shown in the drawings. By providing this structure, it is convenient to cool the laser body 211 and prevent corresponding components from being damaged by high temperature.

[0033] Referring to Figure 1 and Figure 2As shown, in some embodiments of the friction stir additive manufacturing device of the present utility model, the laser unit 20 further includes a laser connecting member 23. The laser connecting member 23 is respectively connected to the laser assembly and the friction stir unit 10, and is used to adjust the focus of the laser emitted by the laser assembly through the laser connecting member 23. Specifically, although the focal length is determined after the laser assembly is assembled, the assembly of the laser assembly and the friction stir unit 10 will also affect the final focal position of the laser. Therefore, by setting the laser connecting member 23, it is possible to improve the rigidity and stability of the device, achieve efficient, precise, and stable assembly connection between the laser assembly and the friction stir unit 10, and facilitate the adjustment of the focal position by adjusting the laser connecting member 23, so that the focus can fall on the corresponding powder, in order to achieve efficient and high-quality friction stir additive manufacturing. Preferably, the laser connecting member 23 is set as a combination of a support frame and multiple support rods, and the components are tightly connected through fasteners such as screws.

[0034] Referring to Figure 3 As shown, in some embodiments of the friction stir additive manufacturing device of the present utility model, the second stirring shaft body 12 is configured to be rotatable relative to the first stirring shaft body 11, and a spiral member 121 is provided on the inner wall of the second stirring shaft body 12. By setting this structure, friction stir can be smoothly achieved, and at the same time, the structure is simpler than rotating the first stirring shaft body 11 and is easy to assemble. Those skilled in the art can set corresponding driving members according to actual needs to realize the rotational drive of the second stirring shaft body 12, which will not be elaborated here. Preferably, a stirring head 122 is provided at the axial end of the second stirring shaft body 12 close to the discharge end of the first material channel 13, so as to achieve friction stir of the powder material through the stirring head 122. Preferably, a discharge channel 1221 that communicates with both the first material channel 13 and the laser channel 111 is provided on the stirring head 122 to facilitate the discharge of the powder material and the passage of the laser. Preferably, the stirring head 122 is connected to the second stirring shaft body 12 through a stirring heat insulation member 16 provided with a second material channel to prevent a large amount of heat of the stirring head 122 from being transferred to the second stirring shaft body 12, thereby prolonging the service life of the components and preventing the powder material from being prematurely plasticized and causing blockage.

[0035] Referring to Figure 2 、 Figure 3 and Figure 4As shown, in some embodiments of the friction stir additive manufacturing device of the present utility model, the friction stir unit 10 further includes a stirring housing 14. The stirring housing 14 is hollow along its own axis and sleeved outside the second stirring shaft body 12; preferably, a ball bearing is provided between the stirring housing 14 and the second stirring shaft body 12, and the inner and outer rings of the ball bearing are respectively connected to the second stirring shaft body 12 and the stirring housing 14. At the same time, the first stirring shaft body 11 and the stirring housing 14 are fixedly connected by fasteners, so that during the friction stir process, the stirring housing 14 and the first stirring shaft body 11 remain relatively stationary, while the second stirring shaft body 12 can rotate to drive the powder material to move along the first material channel 13. An air flow cavity 15 is formed between at least part of the inner wall of the stirring housing 14 and the outer wall of the second stirring shaft body 12; preferably, the air flow cavity 15 is formed only on the side of the discharge end of the first material channel 13. A through second ventilation hole 141 is opened on the stirring housing 14, and the second ventilation hole 141 communicates with the air flow cavity 15. The second ventilation hole 141 is configured to be able to input inert gas, such as argon, nitrogen, helium, etc. into the air flow cavity 15. By setting this structure, on the one hand, convective heat dissipation can be realized to ensure the normal operation of each component; on the other hand, the inert gas can be used to isolate the material to avoid oxidation when processing materials such as aluminum and magnesium, and ensure the high quality of the finished product. Preferably, the device further includes a second gas supply unit (not shown in the figure), and the gas outlet end of the second gas supply unit communicates with the second ventilation hole 141 to provide inert gas through the second gas supply unit.

[0036] Further, referring to Figure 4 As shown, in some embodiments of the friction stir additive manufacturing device of the present utility model, on the side of the discharge end of the stirring housing 14 close to the first material channel 13, it is bent towards the second stirring shaft body 12 to form a blocking portion 142. An air flow gap 1421 is formed between the blocking portion 142 and the outer wall of the second stirring shaft body 12, and the air flow gap 1421 communicates with the air flow cavity 15. By setting the blocking portion 142 to block the inert gas and prevent its rapid escape, convective heat dissipation can be effectively realized to protect the easily oxidized powder material.

[0037] Referring to Figure 3 As shown, in some embodiments of the friction stir additive manufacturing device of the present utility model, the friction stir unit 10 further includes a laser heat insulation member 112. The laser heat insulation member 112 at least covers the inner wall of the first stirring shaft body 11; preferably, the laser heat insulation member 112 also covers the axial end face of the first stirring shaft body 11 on the side of the feeding end close to the first material channel 13. By setting this structure, the heat radiated by the laser can be isolated, and the heat can be prevented from affecting the powder material in the first material channel 13 and avoiding its premature plasticization and blockage.

[0038] The utility model discloses a friction stir additive manufacturing device, which includes a driving device and the friction stir additive manufacturing device described in any one of the above embodiments. The driving end of the driving device is connected to the friction stir additive manufacturing device. The driving device belongs to the prior art, such as a robotic arm, a three-axis driver, etc., and will not be elaborated here. Since the friction stir additive manufacturing device described in the utility model includes the friction stir additive manufacturing device described in the above embodiment, all the beneficial effects thereof are also possessed by the friction stir additive manufacturing device, and will not be elaborated here.

[0039] Working principle:

[0040] During use, powder materials are fed into the first material channel 13, and the second stirring shaft body 12 rotates relative to the first stirring shaft body 11, so that the powder materials move along the channel under the action of the spiral member 121 and are discharged through the discharge channel 1221 of the stirring head 122 to achieve friction stir additive manufacturing.

[0041] During the process of friction stir additive manufacturing, the laser emitter emits laser, and the laser enters the laser channel 111 under the action of the laser lens 2113 and irradiates on the powder materials to provide auxiliary heat for the powder materials. At the same time, the first gas supply unit supplies gas to the laser gap 22 to prevent the powder materials from floating and affecting the passage of the laser; the laser liquid cooling unit conveys circulating cooling liquid to the liquid cooling flow channel 21111 to achieve temperature reduction. When additive manufacturing a metal that is prone to oxidation, the second gas supply unit inputs inert gas into the gas flow cavity 15 to prevent the powder materials from oxidizing.

[0042] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the utility model.

Claims

1. A friction stir additive device, characterized in that: include: A friction stirring unit, the friction stirring unit comprising a first stirring shaft body and a second stirring shaft body, the first stirring shaft body is hollow along its own axial direction to form a laser channel, the second stirring shaft body is hollow along its own axial direction and is sleeved outside the first stirring shaft body, and a first material channel is formed between the inner wall of the second stirring shaft body and the outer wall of the first stirring shaft body; A laser unit, wherein the laser unit comprises a laser assembly, wherein the laser assembly is coaxially connected to the friction stir unit, and wherein the laser assembly is configured to emit a laser that passes through the laser channel, so as to provide additive assistance to the friction stir unit through the laser; a laser gap is formed between the laser assembly and a feeding end of the first material channel; A first gas supply unit is configured to deliver gas to the laser gap.

2. The friction stir additive device according to claim 1, characterized in that: The laser assembly includes a laser body and a protective shell, the protective shell is connected to the laser body, a protective cavity is defined in the protective shell, a laser through hole and a first air vent connected to the protective cavity are defined on the protective shell; the laser emitted by the laser body enters the laser channel from the laser through hole; the air outlet of the first air supply unit is connected to the protective cavity through the first air vent.

3. The friction stir additive device according to claim 2, characterized in that: The laser body includes a laser housing, a laser output device and a laser lens. A laser cavity is arranged in the laser housing. The output end of the laser output device is connected to the laser cavity. The laser output device is used to emit laser light. The laser lens is arranged in the laser cavity. The laser lens is used to focus the laser light emitted by the laser output device so that the laser light passing through the laser channel is coaxial with the laser channel.

4. The friction stir additive device according to claim 3, characterized in that: It also includes a laser liquid cooling unit. A liquid cooling channel is opened on the laser housing, and the liquid cooling channel is connected to the laser liquid cooling unit.

5. The friction stir additive device according to claim 1, characterized in that: The laser unit also includes a laser connector, which is respectively connected to the laser assembly and the friction stirring unit, and is used to adjust the distance of the laser emitted by the laser assembly through the laser connector so that the focus of the laser acts on the working surface.

6. The friction stir additive device according to claim 1, characterized in that: The second stirring shaft body is configured to be rotatable relative to the first stirring shaft body, and a spiral member is provided on the inner wall of the second stirring shaft body.

7. The friction stir additive device according to claim 1 or 6, characterized in that: The stirring friction unit also includes a stirring shell, which is hollow along its own axis and is sleeved outside the second stirring shaft body. An air flow cavity is formed between at least part of the inner wall of the stirring shell and the outer wall of the second stirring shaft body. A second air vent is opened on the stirring shell, and the second air vent is connected to the air flow cavity. The second air vent is configured to be able to input an inert gas into the air flow cavity.

8. The friction stir additive device according to claim 7, characterized in that: The stirring shell is located near the discharge end of the first material channel and is bent toward the second stirring shaft to form a blocking portion. An airflow gap is formed between the blocking portion and the outer wall of the second stirring shaft, and the airflow gap is connected to the airflow cavity.

9. The friction stir additive device according to claim 1, characterized in that: The friction stirring unit further includes a laser heat insulation member, and the laser heat insulation member at least covers the inner wall of the first stirring shaft body.

10. A friction stir additive device, characterized in that: It comprises a driving device and a friction stir additive device as claimed in any one of claims 1 to 9, wherein the driving end of the driving device is connected to the friction stir additive device.

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