Spindle system for friction stir additive manufacturing

Abstract

This invention discloses a spindle system for friction stir additive manufacturing, comprising: a rotating shaft with a pusher tube inside for moving a bar stock; a drive device connected to the rotating shaft and used to drive the rotating shaft to rotate; a pusher device that moves the bar stock located in the pusher tube axially downward through a pusher component; and a friction disc fixed to the lower end of the rotating shaft, the friction disc having a friction groove recessed on the side facing the rotating shaft, with a discharge port extending through the center of the friction groove. This invention features a novel structure and ingenious design, allowing direct contact between the bar stock and the friction disc, reducing the rigidity requirements of the additive manufacturing contact surface; direct contact between the bar stock and the friction disc enables curved and curved surface additive manufacturing; direct contact between the bar stock and the friction disc reduces pressure between the bar stock and the workpiece, reducing defects at the top of the bar stock; the discharge port diameter of the friction disc is adjustable to adapt to different additive manufacturing needs, reducing waste; and the pusher tube prevents the bar stock from shifting during the additive manufacturing process.

Description

Technical Field

[0001] This invention relates to the field of additive manufacturing technology, and in particular to a spindle system for friction stir additive manufacturing. Background Technology

[0002] Additive manufacturing technology refers to a scientific and technological system that directly manufactures parts based on the principle of discrete-stacking, driven by the three-dimensional data of the parts. Depending on different classification principles and understandings, additive manufacturing technology also has various names such as rapid prototyping, rapid forming, rapid manufacturing, and 3D printing. Its connotation is constantly deepening, and its scope is constantly expanding. Here, "additive manufacturing" has the same meaning as "rapid forming" and "rapid manufacturing."

[0003] Patent No. 202310954524.3 discloses a spindle system for friction stir additive manufacturing, specifically including a rotating shaft, a rotary drive device, a pusher shaft, a pusher drive device, and a coolant delivery device. A pusher channel is formed within the rotating shaft; the rotary drive device is drive-connected to the rotating shaft and drives its rotation; the pusher shaft passes through the pusher channel and has a cooling channel within it; the pusher drive device is drive-connected to the pusher shaft; and the coolant delivery device is connected to the cooling channel. The spindle system for friction stir additive manufacturing provided in this application connects the coolant delivery device to the cooling channel, allowing the coolant delivery device to continuously supply coolant to the cooling channel. This enables the pusher shaft to dissipate heat instantly, preventing excessive wear due to high temperatures and effectively extending the service life of the entire spindle system.

[0004] The aforementioned patent documents have the following drawbacks: during the additive manufacturing process, the bar stock is in direct contact with the workpiece, which increases the rigidity requirements of the additive contact surface and also increases the pressure between the bar stock and the workpiece, which can easily lead to low additive manufacturing efficiency and poor additive manufacturing effect. Moreover, since it acts directly on the workpiece, it cannot adaptively adjust to additive manufacturing of different specifications, which can easily generate a lot of waste material and waste a lot of time in the later machining process. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and to provide a spindle system for friction stir additive manufacturing.

[0006] This invention is achieved through the following technical solution:

[0007] A spindle system for friction stir additive manufacturing, comprising:

[0008] A rotating shaft, the interior of which is equipped with a pusher tube for moving the bar stock;

[0009] A drive unit that is connected to the rotating shaft and is used to drive the rotating shaft to rotate.

[0010] A feeding device that moves the bar stock located in the feeding tube axially downward via a feeding component;

[0011] The friction disc is fixed to the lower end of the rotating shaft. The friction disc has a friction groove recessed on the side facing the rotating shaft, and a discharge port is passed through the middle of the friction groove.

[0012] A preferred embodiment of this technical solution is that the rotating shaft has a first through hole, and the pusher tube is disposed in the first through hole with its bottom extending to the outside of the rotating shaft.

[0013] The friction disc is also recessed into a storage groove on the side facing the rotation axis. The friction groove is recessed in the middle of the storage groove. The bottom of the pusher tube extends into the storage groove and there is a certain gap between the bottom surface of the pusher tube and the bottom surface of the storage groove.

[0014] A preferred embodiment of this technical solution is that the storage tank is further provided with an annular protrusion; and the pusher tube is further provided with a buffer groove at the position corresponding to the annular protrusion.

[0015] The preferred embodiment of this technical solution is that the discharge port is an "I"-shaped through hole.

[0016] A preferred embodiment of this technical solution is that the rotating shaft includes a first shaft and a second shaft connected to each other, the second shaft being located at the lower end of the first shaft; the driving device is connected to the first shaft via a belt.

[0017] A preferred embodiment of this technical solution is that the spindle system further includes a fixed frame, which has an "L"-shaped structure. The material pushing device is located at the vertical end of the fixed frame, and the rotating shaft and the driving device are both located at the horizontal end of the fixed frame.

[0018] A preferred embodiment of this technical solution is that the pushing device includes a lifting mechanism, the lifting mechanism includes a lifting component that can move up and down, the pushing component is fixed to the side of the lifting component, and a limiting groove is also provided at the bottom of the pushing component.

[0019] A preferred embodiment of this technical solution is that the horizontal end of the fixing frame has two interconnected first cavities and second cavities, the second cavity being located on the inner side, and the driving device being located at the upper end of the first cavity; a fixing sleeve is provided in the second cavity, the fixing sleeve being connected to the fixing frame, the rotating shaft passing through the fixing sleeve and extending to the outside of the fixing sleeve; a fixing member is fixed at the upper end of the second cavity, the middle of the fixing member having a through hole for the pusher to pass through, the pusher tube being fixed at the lower end of the fixing member, and the fixing member being used to limit the rotation shaft.

[0020] A preferred embodiment of this technical solution is that a cooling mechanism is further provided on the outside of the second shaft, and the cooling mechanism is connected to the fixed sleeve through a connecting frame.

[0021] The preferred embodiment of this technical solution is that the cooling mechanism includes a cooling cover, which is sleeved on the outer middle position of the second shaft. The interior of the cooling cover is also recessed with an annular cooling groove. Cooling water inlet and cooling water outlet are respectively opened on both sides of the cooling cover. Both the cooling water inlet and cooling water outlet are connected to the cooling groove. Sealing grooves are recessed at both the upper and lower ends of the inner wall of the cooling cover, and sealing rings are embedded in the sealing grooves.

[0022] This invention discloses a spindle system for friction stir additive manufacturing, which, compared with the prior art:

[0023] This invention features a novel structure and ingenious design, enabling direct contact between the bar stock and the friction disc, reducing the rigidity requirements of the additive manufacturing contact surface; direct contact between the bar stock and the friction disc allows for curved and surface additive manufacturing; direct contact between the bar stock and the friction disc reduces pressure between the bar stock and the workpiece, and reduces defects at the top of the bar stock; the discharge orifice diameter of the friction disc is adjustable to adapt to different additive manufacturing needs, reducing waste; and the pusher tube prevents the bar stock from shifting during the additive manufacturing process. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 This is a schematic diagram of the drive device and cooling mechanism of the present invention.

[0026] Figure 3 This is a schematic diagram of the structure of the fixing frame of the present invention.

[0027] Figure 4 This is a schematic diagram of the friction disc of the present invention.

[0028] Figure 5 This is a cross-sectional view of the rotating shaft of the present invention.

[0029] Figure 6 for Figure 5 A magnified view of side A.

[0030] The numbers and letters in the diagram represent the names of the corresponding components:

[0031] Wherein: 100, rotating shaft; 101, pusher tube; 102, first shaft body; 103, second shaft body; 101a, buffer groove; 104, fixing component; 200, drive device; 300, pusher device; 301, pusher component; 302, lifting mechanism; 303, lifting component; 400, friction disc; 401, friction groove; 402, discharge port; 403, storage trough; 404, annular protrusion; 500, fixing frame; 600, fixing sleeve; 700, cooling mechanism; 701, connecting frame; 702, cooling cover; 703, cooling groove. Detailed Implementation

[0032] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0033] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0034] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0035] See Figures 1 to 6As shown, this invention discloses a spindle system for friction stir additive manufacturing, comprising: a rotating shaft 100, the interior of which is provided with a pusher tube 101 for moving bar stock; a drive device 200, which is connected to the rotating shaft 100 and is used to drive the rotating shaft 100 to rotate; a pusher device 300, which moves the bar stock located in the pusher tube 101 axially downward via a pusher component 301; and a friction disc 400, which is fixed to the lower end of the rotating shaft 100, and the friction disc 400 has a friction groove 401 recessed on the side facing the rotating shaft 100, with a discharge port 402 penetrating through the middle of the friction groove 401; in this technical solution, during additive manufacturing... During the manufacturing process, the pusher tube 101 remains stationary. The pusher tube 101 provides a limiting and guiding function for the bar stock, preventing it from tilting or shifting due to the high temperature at the bottom causing it to become semi-molten during axial downward movement. This facilitates a smoother pusher process. Since the friction disc 400 is fixed to the lower end of the rotating shaft 100, when the drive device 200 drives the rotating shaft 100 to rotate, the friction disc 400 also rotates with the shaft. The bar stock within the pusher tube 101 is continuously subjected to downward pressure by the pusher element 301 of the pusher device 300. The high-speed rotation of the rotating shaft 100 and the friction disc 400 causes the bottom of the bar stock to gradually become semi-molten due to high temperature within the friction groove 401 of the friction disc 400. This semi-molten material is then discharged through the outlet 402 onto the workpiece, thus realizing the additive manufacturing process. In this technical solution, the bar stock is in direct contact with the friction disc 400, reducing the rigidity requirements of the additive contact surface and enabling curved surface additive manufacturing. Simultaneously, the direct contact between the bar stock and the friction disc 400 reduces the pressure between the bar stock and the workpiece, minimizing defects at the top of the bar stock. Furthermore, the friction disc 400 in this technical solution is detachably fixed to the lower end of the rotating shaft 100, allowing it to be replaced according to actual needs, thus improving the friction... The discharge port 402 of the disc 400 is adapted to different additive manufacturing needs, reducing waste generation. It should be noted that the pusher tube 101 used in this technical solution facilitates the axial downward movement of the bar stock and also blocks the rotating shaft 100 and the bar stock. When the bottom of the bar stock gradually becomes semi-molten due to high temperature, the semi-molten material will not overflow into the rotating shaft 100, thereby extending the service life of the rotating shaft 100 and preventing accumulation at the rotating shaft 100, thus reducing waste generation. It is worth noting that the inner diameter of the friction groove 401 is larger than the diameter of the bar stock; the lower inner diameter of the pusher tube 101 is slightly larger than the diameter of the bar stock, and the upper inner diameter of the pusher tube 101 is larger than the inner diameter of the bar stock.

[0036] See Figures 1 to 6As shown, a first through hole is formed inside the rotating shaft 100, and a pusher tube 101 is disposed in the first through hole with its bottom extending to the outside of the rotating shaft 100; the friction disc 400 also has a recessed storage groove 403 on the side facing the rotating shaft 100, the friction groove 401 is recessed in the middle of the storage groove 403, the bottom of the pusher tube 101 extends to the storage groove 403, and a certain gap is left between the bottom surface of the pusher tube 101 and the bottom surface of the storage groove 403; in this technical solution, the top of the pusher tube 101 also extends to the outside of the rotating shaft 100. As the bottom of the bar stock gradually becomes a semi-molten material in the friction groove 401 due to high temperature, with... The continuous high-speed rotation of the rotating shaft 100 and the friction disk 400, along with the gradual downward movement of the bar stock via the pusher 301, inevitably causes the semi-molten material to overflow into other internal spaces. Therefore, by setting up a storage tank 403, a storage space can be provided for the semi-molten material that overflows into the internal space. In addition, a certain gap between the bottom surface of the pusher tube 101 and the bottom surface of the storage tank 403 can also be used for storage, preventing the semi-molten material from overflowing into the rotating shaft 100 due to insufficient internal space, thus avoiding affecting the operation of the entire additive manufacturing system and extending its service life.

[0037] See Figures 1 to 6 The storage tank 403 is also provided with an annular protrusion 404; the pusher tube 101 is also recessed with a buffer groove 101a at the position corresponding to the annular protrusion 404; in this technical solution, the annular protrusion 404 is located outside the friction tank 401, and the buffer groove 101a at the pusher tube 101 is located above the annular protrusion 404. The annular protrusion 404 does not contact the buffer groove 101a. First, the setting of the annular protrusion 404 can block the semi-molten material overflowing from the friction tank 401 to a certain extent. At the same time, the U-shaped cavity formed between the annular protrusion 404 and the buffer groove 101a can also store material, increasing the storage space.

[0038] See Figures 1 to 6 The discharge port 402 is an "I"-shaped through hole. In this technical solution, as a preferred embodiment, the discharge port 402 is set as an "I"-shaped structure, which allows the semi-molten material to be discharged to the outside in a more concentrated manner. In addition, the discharge port 402 can also be of any shape and can be adjusted and replaced according to the actual additive manufacturing needs. As a further optimization, the discharge port 402 is provided with inclined guide surfaces on the edge positions of both the side near the rotating shaft 100 and the side away from the rotating shaft 100. The inclined direction of the upper end of the discharge port 402 is opposite to the inclined direction of the lower end of the discharge port 402. This inclined structure facilitates the discharge of semi-molten material to the outside.

[0039] See Figures 1 to 6The rotating shaft 100 includes a first shaft body 102 and a second shaft body 103 connected to each other, with the second shaft body 103 located at the lower end of the first shaft body 102. A driving device 200 is connected to the first shaft body 102 via a belt. In this technical solution, the driving device 200 is a drive motor, and a drive wheel is connected to the output shaft end of the driving device 200. The drive wheel is connected to the top of the first shaft body 102 via a belt. The first shaft body 102 is an integrally formed structure, with a second through hole penetrating its interior, the lower end of which is a tapered opening. The first shaft body 102 includes, from top to bottom, a driving part, a connecting part, and a rotating part. The outer diameter of the driving part is larger than the outer diameter of the rotating part, and the outer diameter of the rotating part is larger than the outer diameter of the connecting part. A boss is also provided around the top outer wall of the rotating part. The drive wheel is connected to the drive unit via a belt; the second shaft 103 has a "+" shaped structure, and the top outer wall of the second shaft 103 has a tapered surface. The tapered surface at the top of the second shaft 103 is inserted into the tapered opening of the first shaft 102, and the second shaft 103 is connected to the first shaft 102 by multiple bolts. The interior of the second shaft 103 has a third through hole, which includes a fourth hole, a fifth hole, and a sixth hole from top to bottom. The inner diameter of the fourth hole is smaller than the inner diameter of the first through hole, the inner diameter of the sixth hole is smaller than the inner diameter of the fourth hole, and the inner diameter of the sixth hole is slightly larger than the diameter of the bar stock. The inner diameter at the top of the fifth hole is the same as the inner diameter of the fourth hole, and the inner diameter at the bottom of the fifth hole is the same as the inner diameter of the sixth hole. The fifth hole is a tapered hole. The second through hole and the third through hole constitute the first through hole.

[0040] See Figures 1 to 6 The spindle system also includes a fixed frame 500, which has an "L"-shaped structure. The pusher device 300 is located at the vertical end of the fixed frame 500, and the rotating shaft 100 and the drive device 200 are both located at the horizontal end of the fixed frame 500. In this technical solution, the fixed frame 500 mainly provides an assembly space for the rotating shaft 100, the pusher device 300 and the drive device 200. The fixed frame 500 is later used in conjunction with the actuator to perform multi-axis motion to meet the additive manufacturing process.

[0041] See Figures 1 to 6The pushing device 300 includes a lifting mechanism 302, which includes a lifting component 303 that can move up and down. The pushing component 301 is fixed to the side of the lifting component 303, and a limiting groove 304 is provided at the bottom of the pushing component 301. In this technical solution, as an optimized solution, the lifting mechanism 302 is preferably a servo lifting mechanism, that is, the lifting component 303 is controlled by a servo motor to lift. The lifting component 303 is a lifting plate, and the pushing component 301 is a rod-shaped structure. The limiting groove 304 at the bottom of the pushing component 301 is used to limit and fix the bar material so that the bar material will not deviate during the axial downward movement.

[0042] See Figures 1 to 6 The horizontal end of the fixing frame 500 has two interconnected cavities, a first cavity and a second cavity. The second cavity is located inside, and the driving device 200 is located at the upper end of the first cavity. A fixing sleeve 600 is provided inside the second cavity and is connected to the fixing frame 500. The rotating shaft 100 passes through the fixing sleeve 600 and extends to the outside of the fixing sleeve 600. A fixing member 104 is fixed at the upper end of the second cavity. The middle of the fixing member 104 has a through hole for the pusher tube 301 to pass through. The pusher tube 101 is fixed to the fixing member 104. At the lower end of 4, the fixing member 104 is used to limit the rotation shaft 100; in this technical solution, the fixing sleeve 600 is a cylindrical structure, and the lower middle part of the fixing sleeve 600 is provided with an annular protrusion. Relying on the annular protrusion, the upper part of the fixing sleeve 600 extends into the second cavity. The annular protrusion is fixed to the bottom of the fixing frame 500 by bolts, thereby connecting the fixing sleeve 600 and the fixing frame 500. Both ends of the first shaft body 102 of the rotation shaft 100 extend to the outside of the fixing sleeve 600. The inner wall of the fixing sleeve 600 is provided from top to bottom. There are two stepped surfaces, each equipped with a bearing. The rotating part of the first shaft body 102 of the rotating shaft 100 is located inside the fixed sleeve 600 and passes through the two bearings. The bearings make the rotation of the rotating shaft 100 smoother. Additionally, since the rotating part of the first shaft body 102 also has a boss located at the upper end of the upper bearing, it ensures that the rotating shaft 100 will not move downwards. That is, the upper bearing provides some support for the rotating shaft 100. Furthermore, due to the presence of the fixing member 104, which is fixed to the upper end of the second cavity, ... The fixing member 104 is fixed to the horizontal end of the fixing frame 500, and the push tube 101 is fixed to the lower end of the fixing member 104. Therefore, it can be ensured that the push tube 101 is fixed. Due to the presence of the fixing member 104, it can block and limit the drive part of the rotating shaft 100, so that the rotating shaft 100 will not move axially. The fixing member 104 has an annular mounting groove recessed on the side facing the drive part of the rotating shaft 100. A planar thrust bearing is fixed in the annular mounting groove and contacts the drive part of the rotating shaft 100.

[0043] See Figures 1 to 6 The second shaft 103 is further provided with a cooling mechanism 700 on its exterior. The cooling mechanism 700 is connected to the fixed sleeve 600 via a connecting bracket 701. The cooling mechanism 700 includes a cooling cover 702, which is sleeved on the outer middle of the second shaft 103. The interior of the cooling cover 702 is recessed with an annular cooling groove 703. Cooling water inlets and outlets are respectively provided on both sides of the cooling cover 702, and both the cooling water inlets and outlets are connected to the cooling groove 703. Sealing grooves are recessed at both the upper and lower ends of the inner wall of the cooling cover 703, and sealing rings are embedded in the sealing grooves. In this technical solution, due to the high-speed rotation of the rotating shaft 100, a large amount of heat is generated at the bottom of the bar stock. This heat is transferable, and the transferred heat may affect the middle and lower middle parts of the bar stock, potentially causing the middle part of the bar stock to become half-filled. The molten state affects subsequent additive manufacturing processes. Therefore, a cooling mechanism 700 is installed on the outside of the second shaft 103 to cool the second shaft 103, preventing the bar stock from melting too quickly. Since the rotating shaft 100 is constantly rotating at high speed, the cooling cover 702 is connected to the fixed sleeve 600 through the connecting bracket 701, keeping the cooling cover 702 stationary. Cooling water is continuously circulated through the cooling water inlet and outlet connectors, with cooling water entering through the inlet and exiting through the outlet for cooling. In addition, the sealing groove is located on the upper and lower sides of the cooling groove 703, and the sealing groove is not connected to the cooling groove 703. It is worth noting that a sealing ring is installed in the sealing groove to prevent cooling water leakage. Moreover, the installation of the sealing ring will not affect the high-speed rotation of the rotating shaft 100.

[0044] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A spindle system for friction stir additive manufacturing, characterized by, The utility model relates to a kind of main shaft systems of bar stock, including: Rotary shaft (100), the inside of rotary shaft (100) is equipped with the pusher tube (101) for bar stock movement; Driving device (200), driving device (200) is drivingly connected with rotary shaft (100) and is used to drive rotary shaft (100) rotation; Pusher device (300), pusher device (300) moves bar stock in pusher tube (101) by pusher (301) axially downward; Friction disc (400), friction disc (400) is fixed to the lower end of rotary shaft (100), and friction disc (400) is recessed with friction groove (401) on the side towards rotary shaft (100), and the middle part of friction groove (401) is through with discharge port (402); The inside of the rotary shaft (100) is through with first through-hole, and the pusher tube (101) is arranged in the first through-hole and the bottom thereof extends to the outside of the rotary shaft (100); The side of the friction disc (400) towards the rotary shaft (100) is also recessed with storage groove (403), and the friction groove (401) is recessed in the middle part of the storage groove (403), and the bottom of the pusher tube (101) extends to the storage groove (403), and a gap is left between the bottom surface of the pusher tube (101) and the bottom surface of the storage groove (403); The storage groove (403) is also provided with annular protrusion (404), and the pusher tube (101) is also recessed with buffer groove (101a) at the position corresponding to the annular protrusion (404);The annular protrusion (404) is located on the outer side of the friction groove (401), the buffer groove (101a) at the pusher tube (101) is located above the annular protrusion (404), and the annular protrusion (404) is not in contact with the buffer groove (101a); The discharge port (402) is a "H" type through-hole, and the edge positions of the discharge port (402) close to the rotary shaft (100) and away from the rotary shaft (100) are provided with inclined guide surfaces, and the inclined direction of the upper end of the discharge port (402) is opposite to the inclined direction of the lower end of the discharge port (402).

2. The spindle system for friction stir additive manufacturing according to claim 1, characterized in that: The rotary shaft (100) includes a first shaft body (102) and a second shaft body (103) connected to each other, and the second shaft body (103) is located at the lower end of the first shaft body (102);The driving device (200) is connected to the first shaft body (102) through a belt.

3. The friction stir additive manufacturing spindle system of claim 2, wherein: The main shaft system further includes a fixing frame (500), which is an "L" type structure, the pusher device (300) is arranged on the vertical end of the fixing frame (500), and the rotary shaft (100) and the driving device (200) are arranged on the horizontal end of the fixing frame (500).

4. The friction stir additive manufacturing spindle system of claim 3, wherein: The pusher device (300) includes a lifting mechanism (302), and the lifting mechanism (302) includes a lifting member (303) movable up and down, the pusher (301) is fixed to the side of the lifting member (303), and the bottom of the pusher (301) is also provided with a limiting groove (304).

5. The friction stir additive manufacturing spindle system of claim 4, wherein: The horizontal end of the fixing frame (500) is provided with two first and second cavities in communication with each other, the second cavity is located at the inner side, and the driving device (200) is arranged at the upper end of the first cavity; the second cavity is provided with a fixing sleeve (600), the fixing sleeve (600) is connected with the fixing frame (500), the rotating shaft (100) penetrates through the fixing sleeve (600) and extends to the outside of the fixing sleeve (600); the upper end of the second cavity is fixed with a fixing piece (104), the middle part of the fixing piece (104) is provided with a through hole for the pushing piece (301) to penetrate through, the pushing pipe (101) is fixed to the lower end of the fixing piece (104), and the fixing piece (104) is used for limiting the rotating shaft (100).

6. The friction stir additive manufacturing spindle system of claim 5, wherein: The outer part of the second shaft body (103) is further provided with a cooling mechanism (700), and the cooling mechanism (700) is connected with the fixing sleeve (600) through a connecting frame (701).

7. The friction stir additive manufacturing spindle system of claim 6, wherein: The cooling mechanism (700) comprises a cooling cover (702), the cooling cover (702) is sleeved on the outer middle part of the second shaft body (103), the inner part of the cooling cover (702) is further recessed with an annular cooling groove (703), the two sides of the cooling cover (702) are respectively provided with a cooling water inlet and a cooling water outlet, the cooling water inlet and the cooling water outlet are both communicated with the cooling groove (703), and the inner wall of the cooling cover (702) is recessed with a sealing groove at the upper and lower ends, and a sealing ring is embedded in the sealing groove.

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