A coaxial push-rod type friction stir additive device and method for dosing granules

Abstract

The application provides a coaxial push rod type friction stir additive device and method for granular quantitative feeding. The device and method accurately measure and feed through a quantitative feeding assembly, avoid uneven feeding problems, and ensure forming precision and internal quality consistency. A multi-station storage assembly drives each storage bin to switch between a feeding station and a pressing station, so that the feeding and pressing actions do not interfere with each other, effectively shortening the forming cycle and improving the efficiency. An axial pressing device transfers, compacts and shapes the raw materials, so that the raw materials form a regular shape before entering the friction stir forming head, which is beneficial to subsequent heat conduction and plastic flow and improves the bonding quality. Each storage bin can independently contain different types or proportions of raw materials, and the material can be quickly replaced through rotary switching without stopping and disassembling, which significantly improves the adaptability of the equipment to multi-material systems and the use range.

Description

Technical Field

[0001] This invention belongs to the field of additive manufacturing technology and relates to a coaxial pusher-type stirring friction additive manufacturing device and method for quantitative particle feeding. Background Technology

[0002] Friction Stir Additive Manufacturing (FSAM), as an emerging solid-state additive manufacturing technology, offers significant advantages such as refined microstructure, absence of pores and cracks, and low residual stress due to the fact that the material does not undergo melting and solidification during the forming process. It has broad application prospects in aerospace, rail transportation, and the fabrication of high-performance lightweight alloy components. This technology typically uses metal powders, granules, or bars as raw materials. Through the rotational shearing and axial forging action of a friction stirrer, the material undergoes intense plastic flow, achieving interlayer bonding and layer-by-layer deposition.

[0003] Currently, the feeding methods in existing friction stir additive manufacturing equipment are mainly divided into two categories. The first is continuous bar feeding, where a pre-formed bar is continuously fed into the central channel of the stirring head via a drive mechanism. The frictional heat from the rotation of the stirring head softens and deposits the bar tip. This method requires high straightness and surface quality of the bar and makes it difficult to flexibly switch between different materials. The second is intermittent particle feeding, where granular raw materials are fed into the interior of the stirring head or the front forming area via a vibrating feeder or screw conveyor. However, most existing particle feeding devices use a direct, continuous feeding method into the central hole of the stirring head. The coordination between the feeding rate and the rotation speed and pressure of the stirring head is poor, easily causing feeding fluctuations or uneven accumulation. Furthermore, existing devices lack intermediate transition and quantitative preparation stages between the raw material storage end and the forming end, resulting in poor consistency in the raw material volume during each deposition cycle, thus affecting the dimensional accuracy and internal structure uniformity of the additively formed parts.

[0004] To address the aforementioned issues, there is an urgent need in this field for a feeding and forming scheme that can achieve quantitative supply of granular raw materials and directly feed them into the friction stir forming die head after compaction. This would solve the defects of large fluctuations in material supply and uncontrollable single forming volume in the existing technology, thereby improving the process stability and forming quality consistency of friction stir additive manufacturing. Summary of the Invention

[0005] In order to overcome the problems existing in the prior art, the present invention provides a coaxial pusher-type stirring friction additive manufacturing device and method for quantitative feeding of particles.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] (I) This invention provides a coaxial pusher-type friction stir additive manufacturing device for quantitative particle feeding, comprising a quantitative feeding component, a multi-station storage component, an axial compaction component, a billet forming component, and a friction stir forming head; the multi-station storage component is mounted on a support frame and includes several storage bins, each of which can rotate around the axis of the multi-station storage component, and during rotation, each storage bin can sequentially rotate to the feeding station and the compaction station; the quantitative feeding component is positioned above the feeding station, and the quantitative feeding component can feed the raw material... The material is quantitatively fed into the storage bin located at the feeding station; the axial compaction component is distributed above the pressing station, and the blank forming component is distributed below the pressing station, and the axial compaction component, the blank forming component, and the storage bin of the pressing station are coaxially arranged; the blank forming component is provided with a compaction cavity and a blank shaping channel inside, and the axial compaction component can extend into the storage bin and the compaction cavity in sequence, and push the raw material into the blank shaping channel for compaction; the compacted blank can enter the stirring friction forming head below the blank forming component for additive manufacturing.

[0008] Furthermore, a movable backplate is also provided, which is movably positioned between the billet forming part and the friction stir forming head; the movable backplate switches between a blocking position and a connecting position; when in the blocking position, the movable backplate blocks the outlet of the billet forming part, and under the action of the axial compaction component, the raw material is compacted in the billet shaping channel to form a billet; when in the connecting position, the outlet of the billet forming part is connected to the inlet of the friction stir forming head, and the billet enters the friction stir forming head under the action of the axial compaction component.

[0009] Furthermore, the multi-station material storage assembly also includes an upper moving plate, a lower moving plate, and a stationary plate; the stationary plate is fixedly installed on the support frame, and the stationary plate is provided with a discharge port corresponding to the feed port position of the blank forming part; the upper and lower moving plates are arranged in parallel, and the plurality of storage bins are arranged between the upper and lower moving plates, with both ends of the storage bins fixedly connected to the upper and lower moving plates respectively; the side of the lower moving plate facing away from the storage bins is rotatably connected to the stationary plate, and can rotate relative to the stationary plate; the upper moving plate is provided with a through hole corresponding to the feed end position of the storage bin, and the lower moving plate is provided with a through hole corresponding to the discharge end position of the storage bin, and the raw material can sequentially enter the blank forming part through the upper moving plate through the through hole, the storage bin, the lower moving plate through the through hole, and the discharge port.

[0010] Furthermore, the plurality of storage bins are distributed circumferentially along the upper / lower part of the moving plate; the upper and lower parts of the moving plate and the stationary plate are coaxially arranged.

[0011] Furthermore, the quantitative feeding assembly includes a hopper, a movable baffle, a weighing platform, a gravity sensor, and a fixed bracket; the fixed bracket is fixedly installed on the support frame, the gravity sensor is installed on the fixed bracket, the weighing platform is installed on the gravity sensor, and the hopper is installed on the weighing platform; the movable baffle is movably installed at the discharge port at the bottom of the hopper to control the opening or closing state of the discharge port; when the discharge port is closed, the hopper is fed and weighed; when the discharge port is open, the weighed raw material in the hopper falls into the storage bin at the feeding station.

[0012] Furthermore, the quantitative feeding component also includes a weight display, which is fixedly connected to a fixed bracket and connected to a gravity sensor signal, enabling it to display the weight of the raw material in the hopper in real time.

[0013] Furthermore, the axial compaction component includes a drive cylinder and a pressure rod; the drive cylinder is fixedly mounted on the support frame, and the drive cylinder is drivenly connected to the pressure rod, which can drive the pressure rod to enter or exit the compaction chamber along the axial direction of the blank forming part, so as to apply axial compressive force to the raw material in the compaction chamber.

[0014] Furthermore, in the blank forming part, the cross-section of the compaction cavity is circular, and the cross-section of the blank shaping channel is square; a circle-square gradient forming cavity is also provided between the compaction cavity and the blank shaping channel.

[0015] Furthermore, a deposition platform is provided below the friction stir forming head.

[0016] (II) The present invention also provides a coaxial pusher-type stirring friction additive manufacturing method for quantitative particle feeding, implemented using the above-described device, comprising the following steps: S1. After the granular raw material is weighed to the set mass by the quantitative feeding component, it falls into the storage bin located at the feeding station; S2. Drive the lower drive plate to rotate relative to the stationary plate, thereby driving the upper drive plate and the storage bin to rotate synchronously, so that the storage bin containing a certain amount of raw material is transferred to the pressing station, and the raw material in the storage bin enters the blank forming part through the discharge port. S3. Adjust the movable back plate to the sealing position to block the outlet of the blank forming part; drive the axial compaction part into the blank forming part and apply axial pressure to the granular raw material inside it, so that the granular raw material passes through the compaction cavity, the round-square gradual transformation cavity and the blank forming channel to form a blank. S4. Adjust the movable back plate to the connection position, so that the outlet of the blank forming part is connected to the inlet of the friction stir forming head. The blank enters the friction stir forming head under the further action of the axial compaction component. S5. After the billet is plasticized by the stirring friction forming die head, it is deposited on the deposition platform to form an additive layer.

[0017] The beneficial effects of this invention are: (1) The present invention uses a quantitative feeding component to accurately measure the granular raw material before feeding it into the storage bin, which avoids the problem of uneven feeding that is easy to occur under the traditional continuous feeding method, and ensures that the volume of raw material entering the forming stage is basically consistent each time, thereby improving the dimensional accuracy and internal quality consistency of the additively formed parts. (2) The present invention, through the design of the multi-station material storage component rotating around the axis, enables each material storage bin to be sequentially rotated to the feeding station and the pressing station, realizing the separation of the feeding and pressing processes in space but their connection in time. This structure allows the feeding action of the quantitative feeding component and the compaction action of the axial compaction component to be carried out synchronously without interference, greatly shortening the single forming time and effectively improving the efficiency of additive manufacturing; (3) In this invention, the axial compaction component extends into the storage bin to push the raw material into the compaction cavity of the blank forming component, and further pushes the raw material into the blank shaping channel for compaction and forming. This process integrates raw material transfer, compaction and shaping, so that the raw material can obtain a high density and regular shape before entering the stirring friction forming head, which is beneficial to the heat conduction and plastic flow in the subsequent stirring friction process, and can improve the bonding quality between the formed blank and the matrix. (4) In this invention, the multi-station material storage component is equipped with several storage bins that can respectively hold different types or different proportions of granular raw materials. The forming material can be quickly changed by rotating and switching, without stopping the machine to clean the bins or disassembling the supply pipeline. This significantly improves the equipment's adaptability to forming processes of different material systems and expands the scope of equipment use. (5) The present invention has a compact overall structure. The quantitative feeding, storage bin turnover, axial compaction and stirring friction forming are arranged vertically in sequence. The raw materials are transferred and compacted under the assistance of gravity, which reduces the equipment's dependence on complex conveying mechanisms, simplifies the control method, and improves the reliability of equipment operation and the convenience of maintenance. Attached image description: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the quantitative feeding component structure of the present invention; Figure 3 This is a schematic diagram of the multi-station material storage component structure of the present invention; Figure 4 This is a schematic diagram of the structure of the blank forming part of the present invention; Figure 5 This is a cross-sectional view of the axial compaction component, the multi-station material storage assembly, and the billet forming component of the present invention; Figure 6 This is a schematic diagram of the movable back panel of the present invention in the closed state; Figure 7This is a schematic diagram of the movable back panel of the present invention in the open state; The labels in the attached diagram are: 1. Quantitative feeding assembly; 1-1. Hopper; 1-2. Moving baffle; 1-3. Weighing platform; 1-4. Gravity sensor; 1-5. Fixed bracket; 1-6. Weight display; 2. Multi-station storage assembly; 2-1. Upper moving plate; 2-2. Storage bin; 2-3. Lower moving plate; 2-4. Stationary plate; 2-4-1. Discharge port; 3. Blank forming part; 3-1. Pressure bar; 3-2. Interface; 3-3. Compaction chamber; 3-4. Round-to-square gradient forming cavity; 3-5. Blank shaping channel; 3-6. Blank; 3-7. Moving back plate; 4. Stirring friction forming head; 5. Bearing frame; 6. Axial compaction part; 7. Deposition platform. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1 like Figures 1-5 As shown, this embodiment of the invention provides a coaxial pusher-type friction stir additive manufacturing device for quantitative particle feeding, including a quantitative feeding component 1, a multi-station storage component 2, an axial compaction component 6, a blank forming component 3, and a friction stir forming head 4. The supporting frame 5 serves as the main supporting foundation of the device, used to support and fix the quantitative feeding component 1, the multi-station storage component 2, the axial compaction component 6, the blank forming component 3, and the friction stir forming head 4.

[0020] Specifically, the multi-station material storage assembly 2 is mounted on the support frame 5 and includes several storage bins 2-2. Each storage bin 2-2 can rotate around the axis of the multi-station material storage assembly 2, and during rotation, each storage bin 2-2 can sequentially rotate to the feeding station and the pressing station. The quantitative feeding assembly 1 is located above the feeding station and can quantitatively feed the raw material into the storage bin 2-2 located at the feeding station. The axial compaction component 6 is distributed above the pressing station, and the billet forming component 3 is distributed below the pressing station. The axial compaction component 6, the billet forming component 3, and the storage bin 2-2 of the pressing station are coaxially arranged. The billet forming component 3 has a compaction cavity 3-3 and a billet shaping channel 3-5 inside. The axial compaction component 6 can sequentially extend into the storage bin 2-2 and the compaction cavity 3-3 and push the raw material into the billet shaping channel 3-5 for compaction. After compaction, the blank 3-6 can enter the friction stir forming head 4 below the blank forming part 3 for additive manufacturing. A deposition platform 7 is provided below the friction stir forming head 4. In this embodiment, in the blank forming part 3, the cross-section of the compaction cavity 3-3 is circular, the cross-section of the blank shaping channel 3-5 is square, and a circular-square gradient forming cavity 3-4 is also provided between the compaction cavity 3-3 and the blank shaping channel 3-5.

[0021] During operation, after the storage bin 2-2 rotates to the pressing station, the axial compaction component 6 extends downwards, passing through the internal channel of the storage bin 2-2 and entering the compaction chamber 3-3 and the round-to-square gradient forming chamber 3-4 of the billet forming component 3. This continuously pushes the raw material from the storage bin 2-2 into the billet shaping channel 3-5, where it is compacted to form a billet 3-6 with a predetermined cross-sectional shape and density. The compacted billet 3-6 is output from the lower end of the billet forming component 3 and enters the friction stir forming head 4 located below the billet forming component 3. The friction stir forming head 4 then performs additive manufacturing layer by layer on the deposition platform 7.

[0022] like Figure 1 and Figures 5-7 As shown, a movable backplate 3-7 is also provided. The movable backplate 3-7 is movably disposed between the blank forming part 3 and the friction stir forming head 4 to control the on / off state of the discharge port of the blank forming part 3. The movable backplate 3-7 has a blocking position and a connecting position, and can switch between the two.

[0023] When the movable backplate 3-7 is in the blocking position, it closes the outlet of the blank forming part 3, forming a closed support surface at the lower end of the outlet. Under the downward pressure of the axial compactor 6, the raw material entering the blank forming channel 3-5 cannot be discharged from the lower end, and is therefore continuously compacted within the channel to form a blank 3-6 with a predetermined cross-sectional shape. When the movable backplate 3-7 switches to the connecting position, the outlet of the blank forming part 3 is connected to the inlet of the friction stir forming head 4. At this time, the axial compactor 6 moves downward again, pushing the compacted blank 3-6 out of the blank forming channel 3-5 and allowing it to smoothly enter the friction stir forming head 4 through the outlet for subsequent additive forming.

[0024] like Figure 3 As shown, the multi-station material storage assembly 2 also includes an upper moving plate 2-1, a lower moving plate 2-3, and a stationary plate 2-4; the stationary plate 2-4 is fixedly installed on the support frame 5, and the stationary plate 2-4 is provided with a discharge port 2-4-1 corresponding to the feed port position of the blank forming part 3; the upper moving plate 2-1 and the lower moving plate 2-3 are arranged in parallel, and the plurality of storage bins 2-2 are arranged between the upper moving plate 2-1 and the lower moving plate 2-3, with the two ends of the storage bins 2-2 respectively connected to the upper moving plate 2-1 and the lower moving plate 2-3. -3 is fixedly connected; the side of the moving disk 2-3 facing away from the storage bin 2-2 is rotatably connected to the stationary disk 2-4, and can rotate relative to the stationary disk 2-4; the moving disk 2-1 is provided with a through hole corresponding to the feeding end position of the storage bin 2-2, and the moving disk 2-3 is provided with a through hole corresponding to the discharging end position of the storage bin 2-2. The raw material can enter the blank forming part 3 sequentially through the through hole of the moving disk 2-1, the storage bin 2-2, the through hole of the moving disk 2-3, and the discharge port 2-4-1. More specifically, several storage bins 2-2 are distributed circumferentially along the moving disk 2-1 / moving disk 2-3. The moving disk 2-1, the moving disk 2-3, and the stationary disk 2-4 are coaxially arranged.

[0025] like Figure 4 As shown, the axial compaction component 6 includes a drive cylinder and a pressure rod 3-1. The drive cylinder is fixedly mounted on the support frame 5 and is drivenly connected to the pressure rod 3-1, which can drive the pressure rod 3-1 to enter or exit the compaction chamber 3-3 along the axial direction of the blank forming component 3, so as to apply axial compressive force to the raw material in the compaction chamber 3-3.

[0026] In application, the quantitative feeding component 1 quantitatively feeds granular raw materials into the storage hopper 2-2 located at the feeding station. The raw materials enter the storage hopper 2-2 temporarily through the through hole on the moving plate 2-1. Subsequently, the moving plate 2-1 and the moving plate 2-3 are rotated relative to the stationary plate 2-4, carrying the loaded storage hopper 2-2 from the feeding station to the pressing station. At this time, the discharge end of the storage hopper 2-2 passes through the through hole on the moving plate 2-3 and the discharge port 2-4-1 of the stationary plate 2-4 in sequence, aligning and communicating with the inlet of the blank forming part 3 below. The axial compaction component 6 extends downward, passing through the through hole on the moving plate 2-1 and the internal channel of the storage hopper 2-2 in sequence, pushing the granular raw materials temporarily stored in the storage hopper 2-2 downward, so that they enter the blank forming part 3 through the through hole on the moving plate 2-3 and the discharge port 2-4-1 of the stationary plate 2-4, thereby completing the subsequent compaction and forming processes. By repeating the above loading and rotation actions, each storage bin 2-2 sequentially circulates through the feeding station and the pressing station, enabling continuous turnover and feeding.

[0027] like Figure 2 As shown, the quantitative feeding assembly 1 includes a hopper 1-1, a movable baffle 1-2, a weighing platform 1-3, a gravity sensor 1-4, a weight display 1-6, and a fixed bracket 1-5. The fixed bracket 1-5 is fixedly mounted on the support frame 5. The gravity sensor 1-4 is mounted on the fixed bracket 1-5, and the weighing platform 1-3 is mounted on the gravity sensor 1-4. The hopper 1-1 is mounted on the weighing platform 1-3. The movable baffle 1-2 is movably mounted at the bottom outlet of the hopper 1-1 to control the opening or closing of the outlet. When the outlet is closed, material is added to the hopper 1-1 and weighed. When the outlet is open, the weighed material in the hopper 1-1 falls into the storage bin 2-2 at the feeding station. The weight display 1-6 is fixedly connected to the fixed bracket 1-5 and signal-connected to the gravity sensor 1-4, enabling real-time display of the weight of the material in the hopper 1-1.

[0028] During quantitative feeding, the movable baffle 1-2 first closes the discharge port at the bottom of the hopper 1-1, and then adds granular raw materials into the hopper 1-1. The gravity sensor 1-4 detects the total weight of the hopper 1-1 on the weighing platform 1-3 in real time and transmits the signal to the weight display 1-6. The operator or control system confirms that the raw materials in the hopper 1-1 have reached the preset weight based on the reading of the weight display 1-6 and stops feeding. Then, the movable baffle 1-2 moves to open the discharge port, and the quantitative raw materials in the hopper 1-1 fall automatically under the action of gravity and fall precisely into the storage bin 2-2 located at the feeding station. After completing a single quantitative feeding, the movable baffle 1-2 closes the discharge port again and starts the next feeding and weighing cycle.

[0029] Example 2 This embodiment provides a coaxial pusher-type stirring friction additive manufacturing method for quantitative particle feeding, implemented using the device described in Embodiment 1, and includes the following steps: Step S1, quantitative feeding: Particle raw materials are added to the hopper 1-1 of the quantitative feeding component 1. The gravity sensor 1-4, together with the weighing platform 1-3, weighs the raw materials in the hopper 1-1 in real time. After the raw material mass reaches the set value, the moving baffle 1-2 opens the discharge port at the bottom of the hopper 1-1, so that the weighed quantitative raw materials fall into the storage bin 2-2 located at the feeding station under the action of gravity. Then the moving baffle 1-2 resets and closes the discharge port, completing a single quantitative feeding.

[0030] Step S2, Station Changeover and Raw Material Transfer: The lower rotating disk 2-3 of the multi-station storage component 2 rotates relative to the stationary disk 2-4. The lower rotating disk 2-3 drives the upper rotating disk 2-1 and each storage bin 2-2 to rotate synchronously, so that the storage bin 2-2 containing a certain amount of raw material is transferred from the feeding station to the pressing station. The raw material in the storage bin 2-2 falls into the blank forming part 3 below through the discharge port 2-4-1 opened on the stationary disk 2-4, waiting to be compacted and formed.

[0031] Step S3, Compaction and Shaping: Adjust the movable backplate 3-7 to the blocking position, so that the movable backplate 3-7 blocks the outlet of the blank forming part 3, thus sealing the outlet. Then drive the axial compaction part 6 to extend downwards and enter the storage bin 2-2 and the blank forming part 3 in sequence at the pressing station, applying axial pressure to the granular raw material inside the blank forming part 3. Under the push of the axial compaction part 6, the granular raw material passes through the compaction chamber 3-3, the round-square gradient forming chamber 3-4 and the blank shaping channel 3-5 in sequence, and is pressed into a blank 3-6 with a predetermined cross-sectional shape. At this time, because the movable backplate 3-7 blocks the outlet, the blank 3-6 will not be discharged from the bottom.

[0032] Step S4, Backplate switching and billet output: The movable backplate 3-7 is switched from the blocking position to the connecting position, so that the discharge port of the blank forming part 3 and the feed port of the friction stir forming head 4 are connected. Then the axial compaction part 6 moves downward again, pushing the compacted blank 3-6 out of the blank shaping channel 3-5. The blank 3-6 enters the internal channel of the friction stir forming head 4 through the discharge port, completing the conveying of the blank 3-6 to the friction stir forming head.

[0033] Step S5, Additive Molding: The blanks 3-6 entering the friction stir forming head 4 generate heat under the high-speed rotation and friction of the stirring head, causing the material to undergo violent plastic flow and be fully plasticized. Then, they are deposited layer by layer on the deposition platform 7 according to the preset path to form a dense additive layer.

[0034] Repeat steps S1 to S5 above until a three-dimensional additive part of the desired size and shape is obtained.

[0035] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A coaxial pusher-type stirring friction additive manufacturing device for quantitative particle feeding, characterized in that, It includes a quantitative feeding component (1), a multi-station material storage component (2), an axial compaction component (6), a billet forming component (3), and a stirring friction forming head (4). The multi-station storage assembly (2) is installed on the support frame (5) and includes several storage bins (2-2). Each storage bin (2-2) can rotate around the axis of the multi-station storage assembly (2), and during rotation, each storage bin (2-2) can be sequentially rotated to the feeding station and the pressing station. The quantitative feeding component (1) is located above the feeding station and can quantitatively feed the raw materials into the storage bin (2-2) located at the feeding station. The axial compaction component (6) is distributed above the pressing station, and the blank forming component (3) is distributed below the pressing station. The axial compaction component (6), the blank forming component (3), and the storage bin (2-2) of the pressing station are coaxially arranged. The blank forming component (3) is provided with a compaction cavity (3-3) and a blank shaping channel (3-5). The axial compaction component (6) can extend into the storage bin (2-2) and the compaction cavity (3-3) in sequence and push the raw material into the blank shaping channel (3-5) for compaction. The compacted blank (3-6) can enter the stirring friction forming head (4) below the blank forming component (3) for additive manufacturing.

2. The coaxial pusher-type stirring friction additive manufacturing device for quantitative particle feeding according to claim 1, characterized in that, It is also equipped with a movable back plate (3-7), which is movably positioned between the blank forming part (3) and the stirring friction forming head (4); The movable back plate (3-7) switches between a blocking position and a connecting position. When it is in the blocking position, the movable back plate (3-7) blocks the outlet of the blank forming part (3). Under the action of the axial compaction part (6), the raw material is compacted in the blank forming channel (3-5) to form a blank (3-6). When it is in the connecting position, the outlet of the blank forming part (3) is connected to the inlet of the stirring friction forming head (4). The blank (3-6) enters the stirring friction forming head (4) under the action of the axial compaction part (6).

3. The coaxial pusher-type stirring friction additive manufacturing device for quantitative particle feeding according to claim 1, characterized in that, The multi-station storage assembly (2) also includes an upper moving plate (2-1), a lower moving plate (2-3), and a stationary plate (2-4). The stationary disc (2-4) is fixedly installed on the support frame (5), and the stationary disc (2-4) is provided with a discharge port (2-4-1) corresponding to the feed port position of the blank forming part (3). The upper (2-1) and lower (2-3) of the moving disk are arranged in parallel. The plurality of storage bins (2-2) are arranged between the upper (2-1) and lower (2-3) of the moving disk. The two ends of the storage bins (2-2) are fixedly connected to the upper (2-1) and lower (2-3) of the moving disk, respectively. The side of the lower (2-3) of the moving disk that faces away from the storage bins (2-2) is rotatably connected to the stationary disk (2-4) and can rotate relative to the stationary disk (2-4). The moving plate (2-1) is provided with a through hole corresponding to the feeding end position of the storage bin (2-2), and the moving plate (2-3) is provided with a through hole corresponding to the discharging end position of the storage bin (2-2). The raw material can enter the blank forming part (3) in sequence through the through hole on the moving plate (2-1), the storage bin (2-2), the through hole on the moving plate (2-3), and the discharge port (2-4-1).

4. The coaxial pusher-type stirring friction additive manufacturing device for quantitative particle feeding according to claim 3, characterized in that, The plurality of storage bins (2-2) are distributed circumferentially along the upper (2-1) and lower (2-3) of the moving plate; The upper moving plate (2-1), lower moving plate (2-3), and stationary plate (2-4) are coaxially arranged.

5. The coaxial pusher-type stirring friction additive manufacturing device for quantitative particle feeding according to claim 1, characterized in that, The quantitative feeding assembly (1) includes a hopper (1-1), a movable baffle (1-2), a weighing platform (1-3), a gravity sensor (1-4), and a fixed bracket (1-5). The fixed bracket (1-5) is fixedly installed on the bearing frame (5), the gravity sensor (1-4) is set on the fixed bracket (1-5), the weighing platform (1-3) is set on the gravity sensor (1-4), and the hopper (1-1) is set on the weighing platform (1-3). The movable baffle (1-2) is movably installed at the bottom discharge port of the hopper (1-1) to control the opening or closing state of the discharge port; when the discharge port is closed, the hopper (1-1) is filled and weighed; when the discharge port is open, the weighed raw material in the hopper (1-1) falls into the storage bin (2-2) of the feeding station.

6. The coaxial pusher-type stirring friction additive manufacturing device for quantitative particle feeding according to claim 5, characterized in that, The quantitative feeding component (1) also includes a weight display (1-6), which is fixedly connected to the fixed bracket (1-5) and signal-connected to the gravity sensor (1-4), and can display the weight of the raw material in the hopper (1-1) in real time.

7. The coaxial pusher-type stirring friction additive manufacturing device for quantitative particle feeding according to claim 1, characterized in that, The axial compaction component (6) includes a drive cylinder and a pressure rod (3-1); The drive cylinder is fixedly installed on the support frame (5). The drive cylinder is driven to connect with the pressure rod (3-1). It can drive the pressure rod (3-1) to enter or exit the compaction chamber (3-3) along the axial direction of the blank forming part (3) so as to apply axial pressure to the raw material in the compaction chamber (3-3).

8. The coaxial pusher-type stirring friction additive manufacturing device for quantitative particle feeding according to claim 1, characterized in that, In the blank forming part (3), the cross-section of the compaction cavity (3-3) is circular, and the cross-section of the blank shaping channel (3-5) is square; a circular-square gradient forming cavity (3-4) is also provided between the compaction cavity (3-3) and the blank shaping channel (3-5).

9. The coaxial pusher-type stirring friction additive manufacturing device for quantitative particle feeding according to claim 1, characterized in that, A deposition platform (7) is provided below the friction stir forming head (4).

10. A method for quantitative feeding of granules using a coaxial pusher-type stirring friction additive manufacturing process, implemented using the apparatus described in any one of claims 1 to 9, characterized in that... Includes the following steps: S1. After the granular raw material is weighed to the set mass by the quantitative feeding component (1), it falls into the storage bin (2-2) located at the feeding station; S2. Drive the lower part of the moving disk (2-3) to rotate relative to the stationary disk (2-4), thereby driving the upper part of the moving disk (2-1) and the storage bin (2-2) to rotate synchronously, so that the storage bin (2-2) containing a certain amount of raw material is rotated to the pressing station, and the raw material in the storage bin (2-2) enters the blank forming part (3) through the discharge port (2-4-1); S3. Adjust the movable back plate (3-7) to the blocking position to block the outlet of the blank forming part (3); drive the axial compaction part (6) into the blank forming part (3) and apply axial pressure to the granular raw material inside it, so that the granular raw material passes through the compaction cavity (3-3), the round-square gradual forming cavity (3-4) and the blank forming channel (3-5) to form the blank (3-6); S4. Adjust the movable back plate (3-7) to the communication position, and connect the outlet of the blank forming part (3) with the inlet of the stirring friction forming head (4). The blank (3-6) enters the stirring friction forming head (4) under the further action of the axial compaction component (6). S5. The blank (3-6) is plasticized by the stirring friction forming die head (4) and deposited on the deposition platform (7) to form an additive layer.

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