A powder friction stir additive manufacturing apparatus for aluminum alloys

Abstract

A kind of equipment for aluminum alloy powder friction stir additive manufacturing, it is characterized in that, it includes bed, bed straight guide, column, beam, workbench, beam straight guide, beam straight guide hanging plate, vertical guide, vertical guide hanging plate, installation arc-shaped fixed frame and friction stir additive structure component;Bed straight guide is fixed on bed, workbench is installed on bed and can move along the bed straight guide in X direction;Column is installed on the two sides of bed and is connected by beam, beam is installed with beam straight guide, beam straight guide hanging plate is installed on beam straight guide and can move along the beam straight guide in Y direction, vertical guide is installed on beam straight guide hanging plate, vertical guide hanging plate is installed on vertical guide and can move along the vertical guide in Z direction;One end of installation arc-shaped fixed frame is fixed on vertical guide hanging plate, the other end of installation arc-shaped fixed frame is fixedly connected with friction stir additive structure component, equipment manufacturing is simple, maintenance is convenient, and it is easy to popularize and apply.

Description

Technical Field

[0001] This invention relates to an additive manufacturing technology, particularly a friction stir additive manufacturing technology, and more specifically, a friction stir additive manufacturing equipment suitable for aluminum alloy materials. Background Technology

[0002] Metal printing, or additive manufacturing of metal materials, has become a trend in current and future manufacturing. Existing additive manufacturing methods are still concentrated on melting and covering techniques or extensions thereof, resulting in poor performance. Additively manufactured products can only serve as design references and cannot be truly used in components to achieve the same effect as traditional casting and forging. Currently, many scholars and engineers both domestically and internationally are developing and researching metal printing equipment, but most are based on theories similar to laser welding and laser cladding, failing to overcome existing melting defects, resulting in a large number of additive manufacturing equipment failing to achieve satisfactory results. However, encouragingly, the control systems of current additive manufacturing equipment are very well-developed, enabling precise control of the additive process, thus achieving quite good dimensional accuracy in additive manufacturing. Based on the aforementioned researchers, this invention expands upon the friction stir additive manufacturing method using a friction stir connection, and develops corresponding equipment. The most significant feature of this invention is the use of magnetic levitation bearings to achieve high-speed, low-resistance rotational motion, enabling collision and friction of mixed powders in a high-speed environment, thereby plasticizing the mixed metal powders. Furthermore, magnetic levitation technology integrates the stirring, mixing, and additive manufacturing processes. The main shaft is first driven by two gears, and then rotated further via magnetic levitation. This not only significantly reduces electricity costs but also increases the spindle speed, which is previously limited by gear transmissions. This not only provides the increased speed required for friction stir additive manufacturing but also greatly reduces electricity costs, resulting in a significant reduction in the manufacturing cost of friction stir additive manufacturing. The equipment developed in this invention has a simple structure, is easy to operate, and is readily applicable. Summary of the Invention

[0003] The purpose of this invention is to address the defects such as shrinkage cavities, voids, and looseness that are easily encountered in existing aluminum alloy melt additive manufacturing. The invention designs a friction stir additive manufacturing equipment suitable for aluminum alloy materials. The equipment of this invention realizes the integration of powder feeding and stirring additive manufacturing, and enables the friction stir additive manufacturing of parts with different structural shapes.

[0004] The technical solution of this invention is:

[0005] A friction stir additive manufacturing equipment for aluminum alloy powder is characterized by comprising a bed 1, a bed straight guide rail 2, a column 3, a crossbeam 4, a worktable 5, a crossbeam straight guide rail 6, a crossbeam straight guide rail mounting plate 7, a vertical guide rail 8, a guide rail mounting plate 9, an arc-shaped mounting bracket 10, and friction stir additive manufacturing structural components 11.

[0006] The aforementioned equipment for friction stir additive manufacturing of aluminum alloy powder comprises a friction stir additive manufacturing structure 11 consisting of a spindle sleeve 11-1, a spindle 11-2, a stirring rod 11-3, a stirring head structure 11-4, a gear 11-5, a gear 11-6, a coupling 11-7, a motor 11-8, a stirring jug 11-9, a magnetic levitation bearing 11-10, and a metal flexible connector 11-11. The main shaft sleeve 11-1 has a spline 11-1-1 milled inside. The main shaft 11-2 has a spline 11-2-1 milled inside and an internal control 11-2-2 drilled inside. The stirring rod 11-3 has a stirring blade 11-3-1 welded to the upper part and a stirring pin with an internal stirring cone rod 11-3-2 and threads 11-3-3 on its surface. The stirring head head structure 11-4 has an internal groove 11-4-1 milled inside. The bottom of the internal groove 11-4-1 has a milled hole 11-4-4 drilled. The stirring pin shoulder 11-4-2 is installed below the internal groove 11-4-1. The lower surface of the stirring pin shoulder 11-4-2 has an arc groove 11-4-3 machined. The stirring pin 11-4-5 is installed inside the stirring pin shoulder 11-4-2. The surface of the stirring pin 11-4-5 has threads 11-4-6 machined, and the internal part has a stirring pin inner hole 11-4-7 drilled inside. The head structure 11-4 of the stirring head is connected to the bottom of the outer sleeve 11-1 of the main shaft by bolts 11-12. The main shaft sleeve 11-1 and the main shaft 11-2 are mainly mated by the spline 11-1-1 milled inside the main shaft sleeve 11-1 and the spline 11-2-1 milled inside the main shaft 11-2.

[0007] The internal surface roughness of the mixing jug 11-9 used in the friction stir additive structure component 11 is required to be below 0.02 micrometers.

[0008] The aforementioned equipment for aluminum alloy powder friction stir additive manufacturing is only applicable to aluminum alloys produced by friction stir additive manufacturing, where the particle size of the mixed powder in the additive manufacturing process is in the micrometer range.

[0009] When motor 11-8 is energized, coupling 11-7, connected by bolt 11-13, drives gear 11-6 on its shaft. Gear 11-6 drives gear 11-5, which meshes with it. Gear 11-5 drives main shaft 11-2 mounted on it. The top of main shaft 11-2 is connected to mixing vessel 11-9 via metal flexible connector 11-11. Magnetic bearing 11-10 is installed at the lower end of mixing vessel 11-9 where it connects to metal flexible connector 11-11. When mixing vessel 11-9 rotates under the drive of main shaft 11-2, gear 11-6 separates from gear 11-5, activating magnetic bearing 11-10. The inertial magnetic field force drives mixing vessel 11-9 to rotate at high speed. Mixing vessel 11-9 is filled with aluminum alloy powder with micron-level additive manufacturing ratio and a large amount of steel. Under the high-speed rotation of the mixing pot 11-9, the steel ball continuously collides and compresses the powder, generating frictional heat. This causes a large amount of mixed powder to be plasticized due to the heat. Under the high-speed rotation of the mixing pot 11-9, the plasticized metal powder is centrifugally thrown and transported through the metal flexible connector 11-11 connected to it, the stirring rod 11-3 on the main shaft 11-2, and the mixing blade 11-3-1, the stirring needle with the surface thread 11-3-3, and the internal stirring cone rod 11-3-2. The plasticized metal powder is carried into the inner groove 11-4-1 inside the head structure 11-4 of the mixing head. At the same time, it is carried to the tray mounted on the worktable surface for mixing and additive manufacturing through the milled hole 11-4-4 drilled at the bottom of the inner groove 11-4-1 and the stirring needle inner hole 11-4-7 drilled on the stirring needle 11-4-5. The arc groove 11-4-3 machined on the lower surface of the stirring pin shoulder 11-4-2 and the thread 11-4-6 machined on the surface of the stirring pin 11-4-5 both play a role in the frictional heat storage process during the frictional additive manufacturing process, further helping to plasticize the mixed powder and achieve better frictional additive manufacturing.

[0010] When the friction stir additive manufacturing component 11 is fixed to the mounting arc-shaped bracket 10 by bolts 12, during the friction stir additive manufacturing process, the aforementioned mixed metal powder flows onto the tray mounted on the worktable 5, and friction stir additive manufacturing is achieved through the stirring pin shoulder 11-4-2 and stirring pin 11-4-5 on the stirring head head structure 11-4. To adapt to the additive manufacturing of parts with different shapes, the equipment implements a three-axis linkage structure, that is, the movement on the x-axis is achieved through the bed straight guide rail 2 under the worktable 5, the movement on the y-axis is achieved through the crossbeam straight guide rail 6, and the movement on the z-axis is achieved through the vertical guide rail 8. Depending on the structure, four-axis, five-axis, and other linkage designs can be implemented on the equipment basis. The entire friction stir additive manufacturing process is fully automated through a CNC system that tracks the motion trajectory to ensure the quality of friction stir additive manufacturing.

[0011] The beneficial effects of this invention are as follows: This invention expands the friction stir additive manufacturing method by adopting a friction stir connection method, and develops corresponding equipment based on this. The biggest feature of this invention is that it uses a magnetic levitation bearing to achieve high-speed, low-resistance rotational motion, realizing the collision and friction of mixed powders in a high-speed environment, thereby plasticizing the mixed metal powders. Moreover, the magnetic levitation technology realizes the integration of stirring, powder mixing, and additive manufacturing processes. The main shaft is first driven to rotate by the transmission of two gears, and then the rotation of the main shaft is realized by magnetic levitation. This not only greatly reduces the power cost, but also increases the main shaft speed that is limited by the gear transmission. This not only provides the increased speed required for friction stir additive manufacturing, but also greatly reduces the power cost, resulting in a significant reduction in the manufacturing cost of friction stir additive manufacturing.

[0012] This invention primarily employs a melting additive manufacturing method similar to the powder feeding mechanism in laser additive manufacturing, but it differs from laser cladding additive manufacturing. This is because the equipment does not achieve melting additive manufacturing; it only performs additive manufacturing when the powder is in a semi-molten state. Furthermore, this equipment can be prepared similarly to ordinary laser cladding additive manufacturing to achieve additive manufacturing of parts of different shapes. Its greatest advantage is overcoming the defects of melting additive manufacturing methods such as laser cladding, namely, it avoids defects such as shrinkage cavities, voids, and looseness. Compared to traditional melting additive manufacturing methods, the additive manufacturing quality obtained by this invention is better and more practical. The equipment is simple to operate, pollution-free, and a typical environmentally friendly additive manufacturing method. The equipment is simple to manufacture, easy to maintain, and readily applicable.

[0013] The aluminum alloy parts manufactured by friction stir additive manufacturing according to this invention can replace castings and general forgings, such as door handles and metal frames used in automobiles, greatly improving the quality of these structural parts and ensuring their service life. Although the equipment process of this invention is relatively complex, its actual operation is relatively simple, it can achieve fully automated control, is convenient for operators to use, has simple programming, and is easy to promote in practical applications. Attached Figure Description

[0014] Figure 1 A schematic diagram of the overall structure of the present invention.

[0015] Figure 2 This is a schematic diagram of the friction stir additive manufacturing structure component of the present invention.

[0016] Figure 3 This is a schematic diagram of the spindle sleeve of the present invention.

[0017] Figure 4 This is a schematic diagram of the main shaft structure of the present invention.

[0018] Figure 5 This is a schematic diagram of the stirring rod structure of the present invention.

[0019] Figure 6 This is an enlarged schematic diagram of the stirring rod head of the present invention.

[0020] Figure 7 This is a schematic diagram of the head structure of the stirring head of the present invention.

[0021] Figure 8 This is a partially enlarged schematic diagram of the head structure of the stirring head of the present invention. Figure 8 (a) is a bottom view of the head structure of the stirring head. Figure 8 (b) is a schematic diagram of the shoulder structure of the stirring needle. Figure 8 (c) is a top view of the head structure of the stirring head. Figure 8 (d) is a schematic diagram of the inner hole of the stirring needle.

[0022] Figure 9 This is a schematic diagram of the motor structure of the present invention.

[0023] Figure 10 This is a schematic diagram of the mixing pot structure of the present invention. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] like Figures 1-10 As shown.

[0026] An equipment for friction stir additive manufacturing of aluminum alloy powder includes a bed 1, a bed straight guide rail 2, a column 3, a crossbeam 4, a worktable 5, a crossbeam straight guide rail 6, a crossbeam straight guide rail mounting plate 7, a vertical guide rail 8, a vertical guide rail mounting plate 9, an arc-shaped mounting bracket 10, and friction stir additive manufacturing structural components 11, such as... Figure 1 As shown; the bed straight guide rail 2 is fixed on the bed 1, the worktable 5 is installed on the bed 1 and can move along the bed straight guide rail 2 in the X direction; the column 3 is installed on both sides of the bed 1 and connected by the crossbeam 4, the crossbeam 4 is equipped with the crossbeam straight guide rail 6, the crossbeam straight guide rail mounting plate 7 is installed on the crossbeam straight guide rail 6 and can move along the crossbeam straight guide rail in the Y direction, the crossbeam straight guide rail mounting plate 7 is equipped with the vertical guide rail 8, the vertical guide rail mounting plate 9 is installed on the vertical guide rail 8 and can move along the vertical guide rail 8 in the Z direction; one end of the arc-shaped fixing bracket 10 is fixed on the vertical guide rail mounting plate 9, and the other end of the arc-shaped fixing bracket 10 is fixedly connected to the friction stirring additive manufacturing structure component 11, the friction stirring additive manufacturing structure component 11 as follows Figure 2 As shown, it consists of a main shaft sleeve 11-1, a main shaft 11-2, a stirring rod 11-3, a stirring head structure 11-4, a driven gear 11-5, a stirring jug 11-9, a magnetic levitation bearing 11-10, and a metal flexible connector 11-11; the main shaft sleeve 11-1 has a spline groove 11-1-1 milled inside (as shown). Figure 3The spindle 11-2 has a spline 11-2-1 milled on its surface and an internal hole 11-2-2 drilled inside (as shown). Figure 4 The stirring rod 11-3 has stirring blades 11-3-1 welded to its surface, and one end is connected to a stirring conical rod 11-3-2. The surface of the stirring conical rod 11-3-2 is provided with threads 11-3-3 (e.g., Figure 5 , 6 The stirring head head structure 11-4 has an internal groove 11-4-1 milled inside (as shown). Figure 7 ), bottom of inner groove 11-4-1 (such as Figure 8 (c) Drilled with milled holes 11-4-4 (e.g.) Figure 8 As shown in (b) and (d), the stirring needle shoulder 11-4-2 is installed below the inner groove 11-4-1 (as shown in the diagram). Figure 8 (a) The lower surface of the stirring pin shoulder 11-4-2 is machined with an arc groove 11-4-3, and a stirring pin 11-4-5 is mounted on the stirring pin shoulder 11-4-2. The surface of the stirring pin 11-4-5 is machined with a thread 11-4-6 (e.g. Figure 8 (b) The interior is drilled with a stirring needle inner hole 11-4-7 (e.g.) Figure 8 (d) The head structure 11-4 of the stirring head is connected to the bottom of the main shaft sleeve 11-1 by bolts 11-12; the main shaft sleeve 11-1 and the main shaft 11-2 are connected by the spline groove 11-1-1 inside the main shaft sleeve 11-1 and the spline 11-2-1 on the surface of the main shaft 11-2; the driven gear 11-5 meshes with the driving gear 11-6, and the gear shaft of the driving gear 11-6 is connected to the motor 11-8 fixed on the crossbeam 4 by coupling 11-7. Figure 9The friction stir additive manufacturing structure component 11 moves, causing the driven gear 11-5 to mesh with the driving gear 11-6. The driving gear 11-6 drives the driven gear 11-5 to rotate, and the driven gear 11-5 drives the main shaft 11-2 mounted on it to rotate. The top of the main shaft 11-2 is connected to the mixing vessel 11-9 via a metal flexible connector 11-11. A magnetic levitation bearing 11-10 is installed at the lower end of the mixing vessel 11-9 where it connects to the metal flexible connector 11-11. When the mixing vessel 11-9 rotates under the drive of the main shaft 11-2, the driving gear 11-6 separates from the driven gear 11-5, and the magnetic levitation bearing 11-10 is activated. The inertial magnetic field force drives the mixing vessel 11-9 to rotate at high speed. The mixing vessel 11-9 contains micron-sized aluminum alloy powder and steel balls that need to be additively processed. Under the high-speed rotation of the mixing vessel 11-9, the steel balls continuously collide and compress the powder, generating frictional heat. This causes a large amount of mixed powder to plasticize due to the heat. The mixing vessel 11-9, rotating at high speed, centrifugally throws and mixes the plasticized metal powder. This powder is then carried by the metal flexible connector 11-11 connected to it, and the mixing rod 11-3 on the main shaft 11-2. The powder is then carried sequentially by the mixing blades 11-3-1 and the internal mixing cone 11-3-2 of the mixing needle with surface threads 11-3-3 into the milled inner groove 11-4-1 inside the mixing head structure 11-4. Simultaneously, the powder is carried through the milled hole 11-4-4 at the bottom of the inner groove 11-4-1 and the inner hole 11-4-7 on the mixing needle 11-4-5 to a tray mounted on the worktable 5 for additive manufacturing. The arc groove 11-4-3 machined on the lower surface of the mixing needle shoulder 11-4-2 and the thread 11-4-6 machined on the surface of the mixing needle 11-4-5 both contribute to the frictional heat storage process during frictional additive manufacturing, further aiding in the plasticization of the mixed powder and achieving better frictional additive manufacturing.

[0027] like Figure 10 As shown, the stirring jug 11-9 used in the friction stir additive manufacturing equipment for aluminum alloy powder requires an internal surface roughness of less than 0.02 micrometers.

[0028] The aforementioned equipment for aluminum alloy powder friction stir additive manufacturing is characterized in that this equipment is only applicable to aluminum alloys for friction stir additive manufacturing, and the corresponding mixed powder particle size in the additive manufacturing process is in the micrometer range.

[0029] The working process of this invention is as follows:

[0030] like Figures 2 to 10As shown, when the motor 11-8 is energized, the coupling 11-7 connected by bolts 11-13 drives the drive gear 11-6 on its shaft. The drive gear 11-6 drives the driven gear 11-5 meshing with it. The driven gear 11-5 drives the main shaft 11-2 mounted on it. The top of the main shaft 11-2 is connected to the mixing pot 11-9 through a metal flexible connector 11-11. A magnetic levitation bearing 11-10 is installed at the lower end of the mixing pot 11-9 where it connects to the metal flexible connector 11-11. When the mixing pot 11-9 rotates under the drive of the main shaft 11-2, the drive gear 11-6 separates from the driven gear 11-5 (the stirring friction additive manufacturing structure component 11 moves along the horizontal beam straight guide rail 6 under the drive of the horizontal beam straight guide rail mounting plate 7, thereby separating the drive gear 11-6 from the driven gear 11-5). The magnetic levitation bearing 11-10 is activated, and the inertial magnetic field force drives the mixing pot 11-9. The mixing jug 11-9 is loaded with micron-sized aluminum alloy powder and a large number of steel balls. Under the high-speed rotation of the mixing jug 11-9, the steel balls continuously collide and compress the powder, generating frictional heat. This causes a large amount of mixed powder to be plasticized due to the heat. Under the high-speed rotation of the mixing jug 11-9, the plasticized metal powder is centrifugally thrown through the metal flexible connector 11-11 connected to it and the stirring rod 11-3 on the main shaft 11-2. The mixed powder is then carried by the stirring blade 11-3-1 and the stirring pin with the surface thread 11-3-3 inside the stirring cone rod 11-3-2 into the inner groove 11-4-1 of the stirring head head structure 11-4. At the same time, it is carried by the milled hole 11-4-4 drilled at the bottom of the inner groove 11-4-1 and the stirring pin 11-4-5 with the stirring pin inner hole 11-4-7 drilled on it to the tray mounted on the worktable surface for stirring additive manufacturing. The arc groove 11-4-3 machined on the lower surface of the stirring pin shoulder 11-4-2 and the thread 11-4-6 machined on the surface of the stirring pin 11-4-5 both play a role in the frictional heat storage process during the frictional additive manufacturing process, further helping to plasticize the mixed powder and achieve better frictional additive manufacturing.

[0031] like Figure 1 , Figure 2 and Figure 7As shown, when the friction stir additive manufacturing structure component 11 is fixed to the mounting arc-shaped bracket 10 by bolts 12, during the friction stir additive manufacturing process, the aforementioned mixed metal powder flows onto the tray mounted on the worktable 5, and friction stir additive manufacturing is achieved through the stirring pin shoulder 11-4-2 and stirring pin 11-4-5 on the stirring head head structure 11-4. To adapt to the additive manufacturing of parts with different shapes, the equipment implements a three-axis linkage structure, that is, the movement on the x-axis is achieved through the bed straight guide rail 2 under the worktable 5, the movement on the y-axis is achieved through the crossbeam straight guide rail 6, and the movement on the z-axis is achieved through the vertical guide rail 8. Depending on the structure, four-axis, five-axis, and other linkage designs can be implemented on the basis of the equipment. The entire friction stir additive manufacturing process is fully automated through a CNC system that tracks the motion trajectory to ensure the quality of friction stir additive manufacturing.

[0032] The parts not covered in this invention are the same as or can be implemented using existing technologies.

Claims

1. An equipment for friction stir additive manufacturing of aluminum alloy powder, characterized in that, It includes a bed (1), a bed straight guide rail (2), a column (3), a crossbeam (4), a worktable (5), a crossbeam straight guide rail (6), a crossbeam straight guide rail mounting plate (7), a vertical guide rail (8), a vertical guide rail mounting plate (9), an arc-shaped mounting bracket (10), and a friction stirring additive manufacturing structure component (11). The bed straight guide rail (2) is fixed on the bed (1), and the worktable (5) is installed on the bed (1) and can move along the bed straight guide rail (2) in the X direction. The column (3) is installed on both sides of the bed (1) and connected by the crossbeam (4). The crossbeam (4) is equipped with the crossbeam straight guide rail (6), and the crossbeam straight guide rail mounting plate (7) is installed on the crossbeam straight guide rail (6) and can move along the crossbeam straight guide rail. The guide rail moves in the Y direction. A vertical guide rail (8) is installed on the horizontal beam straight guide rail mounting plate (7). The vertical guide rail mounting plate (9) is installed on the vertical guide rail (8) and can move in the Z direction along the vertical guide rail (8). One end of the arc-shaped fixing bracket (10) is fixed on the vertical guide rail mounting plate (9), and the other end of the arc-shaped fixing bracket (10) is fixedly connected to the stirring friction additive structure component (11). The stirring friction additive structure component (11) consists of a main shaft sleeve (11-1), a main shaft (11-2), a stirring rod (11-3), a stirring head head structure (11-4), a driven gear (11-5), a stirring jug (11-9), a magnetic levitation bearing (11-10), and a metal... It consists of a flexible connector (11-11); the spindle outer sleeve (11-1) has a spline groove (11-1-1) milled inside; the spindle (11-2) has a spline (11-2-1) milled on its surface and an inner hole (11-2-2) drilled inside; the stirring rod (11-3) has stirring blades (11-3-1) welded to its surface, and a stirring conical rod (11-3-2) connected to one end; the stirring conical rod (11-3-2) has threads (11-3-3) on its surface; the stirring head head structure (11-4) has an inner groove (11-4-1) milled inside; the bottom of the inner groove (11-4-1) has a milled hole (11-4-4); and a stirring needle shoulder is installed below the inner groove (11-4-1). 11-4-2), the lower surface of the stirring needle shoulder (11-4-2) is machined with an arc groove (11-4-3), the stirring needle (11-4-5) is mounted on the stirring needle shoulder (11-4-2), the surface of the stirring needle (11-4-5) is machined with threads (11-4-6), and the interior of the stirring needle has a drilled hole (11-4-7); the stirring head head structure (11-4) is connected to the bottom of the main shaft sleeve (11-1) by bolts (11-12); the main shaft sleeve (11-1) and the main shaft (11-2) are connected by the spline groove (11-1-1) inside the main shaft sleeve (11-1) and the spline (11-2-1) on the surface of the main shaft (11-2);The driven gear (11-5) meshes with the driving gear (11-6). The gear shaft of the driving gear (11-6) is connected to the motor (11-8) via a coupling (11-7). The movement of the stirring friction additive manufacturing structure component (11) causes the driven gear (11-5) to mesh with the driving gear (11-6). The driving gear (11-6) drives the driven gear (11-5) to rotate, and the driven gear (11-5) drives the main shaft (11-2) mounted on it to rotate. The top of the main shaft (11-2) is connected to the mixing pot (11-8) via a metal flexible connector (11-11). -9) are connected together. A magnetic levitation bearing (11-10) is installed at the lower end of the mixing jug (11-9) where it connects to the metal flexible connector (11-11). When the mixing jug (11-9) is rotated by the main shaft (11-2), the driving gear (11-6) separates from the driven gear (11-5), activating the magnetic levitation bearing (11-10). The inertial magnetic field force drives the mixing jug (11-9) to rotate at high speed. The mixing jug (11-9) contains micron-sized aluminum alloy powder and steel balls required for additive manufacturing. Under the high-speed rotation of the mixing jug (11-9), the steel balls do not... The powder is continuously collided and squeezed, generating frictional heat, causing a large amount of mixed powder to plasticize due to the heat. Under the high-speed rotation of the mixing vessel (11-9), the plasticized metal powder is centrifugally thrown and transported through the metal flexible connector (11-11) connected to it, the stirring rod (11-3) on the main shaft (11-2), and the mixing powder is sequentially carried into the inner groove (11-4-1) milled inside the stirring head head structure (11-4) by the stirring blades (11-3-1) and the stirring pin with surface threads (11-3-3). Inside the inner groove (11-4-1), the mixture is simultaneously carried to the tray mounted on the worktable (5) for stirring additive manufacturing through the milled hole (11-4-4) drilled at the bottom of the inner groove (11-4-1) and the stirring needle inner hole (11-4-7) drilled on the stirring needle (11-4-5). The arc groove (11-4-3) machined on the lower surface of the stirring needle shoulder (11-4-2) and the thread (11-4-6) machined on the surface of the stirring needle (11-4-5) both play a role in frictional heat storage during the stirring friction additive manufacturing process, further helping to plasticize the mixed powder and achieve better stirring friction additive manufacturing.

2. The equipment for friction stir additive manufacturing of aluminum alloy powder according to claim 1, characterized in that, The surface roughness of the mixing jug (11-9) used in the friction stir additive structure component (11) is required to be below 0.02 micrometers.

3. The equipment for friction stir additive manufacturing of aluminum alloy powder according to claim 1, characterized in that, It is only applicable to aluminum alloys produced by friction stir additive manufacturing, where the corresponding mixed powder particle size in the additive manufacturing process is in the micrometer range.

4. The equipment for friction stir additive manufacturing of aluminum alloy powder according to claim 1, characterized in that, The friction stir additive manufacturing structure component (11) is fixed to the mounting arc-shaped fixing frame (10) by bolts (12). During the friction stir additive manufacturing process, the mixed metal powder flows onto the tray mounted on the worktable (5) and is used for friction stir additive manufacturing through the stirring needle shoulder (11-4-2) and stirring needle (11-4-5) on the stirring head head structure (11-4). In order to adapt to the additive manufacturing of parts of different shapes, the equipment implements a three-axis linkage structure, that is, the movement on the x-axis is realized through the bed straight guide rail (2) under the worktable (5), the movement on the y-axis is realized through the crossbeam straight guide rail (6), and the movement on the z-axis is realized through the vertical guide rail (8). Depending on the structure, four-axis and five-axis linkage design can be implemented on the basis of the equipment. The entire friction stir additive manufacturing process is fully automated by the CNC system to track the motion trajectory and ensure the quality of friction stir additive manufacturing.

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