Stirring friction material adding device for synchronous feeding of powder materials and bar materials

Abstract

The invention relates to the technical field of stirring friction material adding, in particular to a stirring friction material adding device for synchronous feeding of powder materials and bar materials. The bar feeding device comprises a shell, a feeding rotary column rotating in the shell, a bar feeding channel coaxially arranged in the feeding rotary column and a feeding assembly supplying bars to the bar feeding channel and pressing the bars downwards, and an extrusion hole communicating with the bottom of the bar feeding channel is formed in the bottom end of the feeding rotary column. Fluid materials plasticized by friction between the bars and the bottom wall of the bar feeding channel are discharged; a friction cavity is formed between the outer edge of the lower portion of the feeding rotary column and the shell, a powder supply assembly for supplying powder to the friction cavity is arranged on the side wall of the shell, and fluid materials are formed through friction plasticization of the cavity wall of the friction cavity and the powder. The continuous output operation of the additive material is not stopped in the intermittent bar supply process, the forming efficiency is improved, meanwhile, the temperature generated at the material connecting position is uniform, interlayer combination is stable, and the consistency of the mechanical property of a formed part is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of friction stir additive manufacturing technology, specifically a friction stir additive manufacturing device for simultaneous feeding of powder and rod materials. Background Technology

[0002] Friction stir additive manufacturing (FSM) is an advanced additive manufacturing technology based on solid-state bonding. It uses frictional heat to induce plastic flow in materials and deposit them layer by layer to form a shape. With its advantages of low heat input, no melting defects, and high density of formed parts, FSM has become one of the new manufacturing technologies for forming complex metal components in aerospace, new energy vehicles, energy storage structures, civil engineering and other fields.

[0003] Currently, common friction stir additive manufacturing devices mainly use rod-shaped materials as raw materials. By rotating and pressing down, the rods generate heat through friction with the substrate or the deposited layer, thereby achieving the plasticization and deposition of the material.

[0004] However, in practical applications, it has been found that because the bars need to be supplied in segments, the frictional heat source is interrupted during bar replacement or feeding intervals, causing the additive manufacturing process to stop. This interruption not only affects forming efficiency but may also generate temperature gradients at material joints, leading to defects such as uneven microstructure and weakened interlayer bonding, thus reducing the mechanical properties and consistency of the formed parts. Therefore, this problem urgently needs to be solved. Summary of the Invention

[0005] In order to avoid and overcome the technical problems existing in the prior art, the present invention provides a stirring friction additive manufacturing device for simultaneous feeding of powder and rod, which can continuously output additive materials without stopping the process of intermittent rod supply, thereby improving the forming efficiency. At the same time, it makes the temperature uniform at the material connection and the interlayer bonding stable, ensuring the consistency of the mechanical properties of the formed parts.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A friction additive manufacturing device for simultaneous feeding of powder and rods includes a housing, a feeding column rotating within the housing, a rod feeding channel coaxially arranged within the feeding column, and a feeding assembly that supplies rods to the feeding channel and can press the rods downwards. The feeding column has an extrusion orifice at its bottom end, communicating with the bottom of the rod feeding channel, to discharge fluid material formed by frictional plasticization of the rods against the bottom wall of the feeding channel. A friction cavity is formed between the lower outer edge of the feeding column and the housing. A powder feeding assembly is provided on the side wall of the housing to supply powder to the friction cavity. The friction cavity wall and the powder are frictionally plasticized to form a fluid material. The bottom end of the housing also has a converging cavity communicating with the extrusion orifice and the bottom of the friction cavity, with an additive manufacturing outlet at the bottom of the converging cavity for discharging the fluid material.

[0007] As a further aspect of the present invention: a powder conveying thread is provided on the outer periphery of the column above the friction cavity on the feeding rotating column. The column section with the powder conveying thread and the inner wall of the outer shell together form a spiral conveying mechanism for supplying powder to the friction cavity. The discharge end of the powder supply component points to the column section with the powder conveying thread on the feeding rotating column.

[0008] As a further embodiment of the present invention: the powder supply assembly includes a powder feeding guide box fixed on the outer shell, and a powder feeding pipe for supplying powder is provided at the feeding port communicating with the inner cavity of the outer shell on the powder feeding guide box; the inner cavity of the powder feeding guide box is provided with a pushing part that slides back and forth toward the feeding port, and the two side walls and the bottom wall of the pushing part along the sliding direction are all in contact with the box wall of the powder feeding guide box, and the powder is pushed into the inner side of the outer shell when the pushing part slides toward the feeding port.

[0009] As a further embodiment of the present invention: the pushing part is a powder pushing rack with the tooth surface facing upward and the length direction of the powder pushing rack arranged along its sliding direction. A connecting gear that meshes with the powder pushing rack is rotatably fitted on the powder feeding guide box. A transmission screw is coaxially fixed on the connecting gear. A sliding baffle that forms a screw-slider structure together with the transmission screw is threaded onto the transmission screw. When the powder pushing rack slides away from the feeding port, the sliding baffle slides to cover the feeding port. When the powder pushing rack slides toward the feeding port, the sliding baffle slides to open the feeding port.

[0010] As a further embodiment of the present invention: a powder feeding motor is installed on the side wall of the powder feeding guide box, and a crank connecting rod connected to the pushing part is installed at the output end of the powder feeding motor. The powder feeding motor, the crank connecting rod and the pushing part together form a crank sliding mechanism that drives the pushing part to slide back and forth.

[0011] As a further embodiment of the present invention: the feeding assembly includes a mounting cylinder, the lower part of the inner cavity of the mounting cylinder has a guide sleeve for guiding the bar, the guide sleeve is coaxially arranged directly above the bar feeding channel and the two are connected to each other, the upper part of the inner cavity of the mounting cylinder has a pressure rod that reciprocates and inserts into the inner cavity of the guide sleeve; the side wall of the guide sleeve has a feeding notch extending to the outside of the mounting cylinder, and the side wall of the mounting cylinder is equipped with a feeding module that continuously supplies the bar to the feeding notch, so that when the pressure rod returns to the upper part of the feeding notch, the bar slides into the inner cavity of the guide sleeve.

[0012] As a further embodiment of the present invention: the feeding module includes a bar storage box, the inner cavity of the bar storage box has a storage channel for placing bars side by side, one end of the storage channel is connected to the feeding notch, and the other end of the storage channel is provided with an elastic part that elastically squeezes the bars toward the feeding notch.

[0013] As a further embodiment of the present invention: the upper part of the inner cavity of the mounting cylinder is axially slidably fitted with a pressing part, the pressing rod is fixed at the bottom end of the pressing part, and the upper part of the pressing part is provided with an inclined groove; the upper part of the inner cavity of the mounting cylinder is also rotatably fitted with a power shaft driven by a feeding motor, and the side wall of the power shaft is fixed with a wedge that forms an inclined wedge engagement with the inclined groove to drive the pressing part to slide downward, so as to constitute the process movement of the reciprocating insertion action; the mounting cylinder is also provided with a return spring that drives the pressing part to reset upward, so as to constitute the return movement of the reciprocating insertion action.

[0014] As a further embodiment of the present invention: the bottom of the outer shell is a detachable collection cover, the inner cavity of the collection cover is conical, the inner cavity of the collection cover constitutes the converging cavity, and the additive outlet is located at the lower pointed tip of the converging cavity.

[0015] As a further embodiment of the present invention: the upper diameter of the feeding column is reduced to form a drive shaft, the drive shaft is rotated and fitted in the inner cavity of the housing through a bearing, the power component includes a drive gear driven by a power motor, and a driven gear that meshes with the drive gear is coaxially fixed on the drive shaft.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This application features a unique feeding roller design, with a bar stock feeding channel coaxially arranged within its inner cavity. A friction cavity is formed between the lower outer periphery of the feeding roller and the housing. During use, after the bar stock is pressed into the bar stock feeding channel, the bar stock rotates relative to the bottom wall of the feeding channel as the feeding roller rotates, thereby frictionally plasticizing and forming a fluid material. This fluid material is then extruded downwards through the extrusion orifice at the bottom of the feeding roller into the converging cavity and discharged from the additive manufacturing outlet, serving as the primary additive material supply. Furthermore, a powder supply assembly supplies powder to the wall of the friction cavity. The relative rotation of the feeding roller and the housing causes the powder in the friction cavity to... Friction plasticization The fluid material is formed and gathers in the gathering cavity. It is also discharged from the additive outlet device. As a bar stock supply channel, it assists in the supply of additive materials during the short interval of bar stock supply, effectively ensuring the continuous supply of additive materials, improving forming efficiency, and at the same time, making the temperature uniform at the material connection and the interlayer bonding stable, ensuring the consistency of the mechanical properties of the formed parts.

[0017] 2. On the feeding column, the column portion located above the friction chamber has powder conveying threads machined on its outer circumference. This part of the column, together with the inner wall of the outer shell, forms a spiral conveying mechanism used to transport the powder to the friction chamber. The powder supply assembly supplies metal or alloy powder to the spiral conveying mechanism. Compared to directly conveying powder to the friction chamber through a pipeline, the feeding is more uniform and can continuously generate a thrust towards the friction chamber, ensuring that the powder enters the friction chamber stably. At the same time, during the spiral feeding process, it can also preheat the powder through initial friction, ensuring that the powder can be fully plasticized in the friction chamber.

[0018] 3. This application employs an intermittent pulse-type feeding method using a pusher rack, ensuring a relatively constant volume of powder pushed in each stroke. By adjusting the crank's speed or stroke, the amount of powder fed into the system per unit time can be precisely controlled, facilitating matching with the bar feed speed. This ensures stable feeding during the brief intervals of the feeding assembly's "push-up" cycle, maintaining a stable dynamic balance of material and heat within the friction chamber. Furthermore, the linkage mechanism between the sliding baffle and the feeding port ensures that the sliding baffle closes synchronously when the pusher retracts to prepare for the next push, physically isolating the powder feeding pipe, powder guide box, and internal high-pressure friction chamber. This effectively prevents accidental powder intake due to negative pressure or cyclones caused by rotating components within the friction chamber during non-feeding periods, or prevents powder from flowing away under gravity, thus avoiding uncontrollable powder loss and contamination. Finally, the reciprocating sliding of the pusher section can produce a slight compaction and shearing effect on the powder at the feed port, which can prevent the powder from accumulating and clogging at the inlet and ensure the long-term reliability of the feeding.

[0019] 4. Multiple bars are stored side-by-side in the storage channel of the bar storage box, with an elastic element continuously pushing the bars towards the feed notch. The bars are pressed down using a reciprocating pressure rod. During use, as the pressure rod moves downward, it presses the bar into the rotating bar feeding channel. When the pressure rod rises to expose the feed notch, the next bar automatically rolls into the guide sleeve cavity under the push of the elastic element, awaiting the next press. This cycle repeats, achieving intermittent automatic feeding and pressing of bars. The intervals are short and the feeding rhythm is stable, easily achieving stable coordination with powder supply. Attached Figure Description

[0020] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0021] Figure 2 This is a schematic diagram of the connection structure between the feeding rotating column and the outer shell in this invention.

[0022] Figure 3 This is a schematic diagram of the structure of the collection cover in this invention.

[0023] Figure 4 This is an exploded structural diagram of the feeding assembly in this invention.

[0024] Figure 5 This is a schematic diagram of the structure of the bar material in this invention.

[0025] Figure 6 This is an exploded structural diagram of the power assembly and the feeding rotating column in this invention.

[0026] Figure 7 This is an exploded structural diagram of the powder supply component in this invention.

[0027] Figure 8 This is a three-dimensional structural diagram of the present invention.

[0028] In the diagram: 10. Feeding assembly; 11. Mounting cylinder; 111. Guide sleeve; 112. Feed notch; 12. Feeding motor; 121. Drive shaft; 122. Wedge; 13. Bar storage box; 131. Push spring; 132. Push plate; 14. Pressing section; 141. Inclined groove; 142. Pressing rod; 15. Return spring; 20. Power assembly; 21. Power motor; 211. Drive gear; 22. Driven gear; 30. Feeding rotary column; 31. Powder conveyor. 32. Threaded feed; 33. Bar stock feeding channel; 34. Extrusion orifice; 40. Drive shaft; 41. Powder feeding assembly; 42. Powder pushing rack; 43. Powder feeding pipe; 44. Connecting gear; 45. Transmission screw; 46. Sliding baffle; 47. Powder feeding motor; 48. Crank connecting rod; 58. Powder feeding guide box; 59. Housing; 50. Friction chamber; 51. Collection hood; 52. Converging chamber; 522. Additive manufacturing outlet; 60. Bar stock; 61. Anti-rotation groove; 62. Anti-rotation insert. Detailed Implementation

[0029] The technical solutions of the embodiments 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, and 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.

[0030] For ease of understanding, the specific structure and operation of the present invention will be further described below with reference to the accompanying drawings: The specific structure of this invention is as follows: Figure 1-8 As shown, its main structure includes a shell 50 with a cylindrical inner cavity at the bottom, and a feeding column 30 driven to rotate by a power motor 21 at the center of the cylindrical section of the shell 50. The inner cavity of the feeding column 30 has a bar feeding channel 32, through which the feeding assembly 10 supplies bars 60 from top to bottom into the inner cavity of the bar feeding channel 32. The bars 60 are in contact with the bottom wall of the bar feeding channel 32. Friction plasticization The fluid material is then extruded downwards through the extrusion hole 33 at the bottom of the feeding column 30; in addition, a friction cavity 51 is formed between the lower outer edge of the feeding column 30 and the outer shell 50, and a powder supply assembly 40 for supplying powder to the friction cavity 51 is provided on the side wall of the outer shell 50. Friction plasticization A fluid material is formed. The fluid material in the friction chamber 51 and the fluid material extruded from the extrusion orifice 33 are gathered in the gathering chamber 521 and discharged from the outer casing 50 through the additive outlet 522 at the bottom of the gathering chamber 521, thereby realizing the extrusion additive operation.

[0031] Preferred, such as Figure 2 and Figure 3 As shown, a conical collecting hood 52 is installed at the bottom of the outer casing 50 via a detachable connection (such as bolts or flanges). The inner cavity of the collecting hood 52 forms a converging cavity 521, and the additive outlet 522 is located at the lower pointed part of the converging cavity 521. On the one hand, the conical structure facilitates the convergence of fluid materials. On the other hand, the detachable structure allows the collecting hood 52 to be disassembled and excess material removed during shutdown operations, so that when the machine is restarted, the converging cavity 521, which cannot generate heat, will not become clogged due to the material's inability to plasticize.

[0032] Based on the above main operating modes, the following will further describe in detail the structure and cooperation relationship of the power unit 20, the feeding unit 10 and the powder feeding unit 40.

[0033] 1. Power Components 20

[0034] The feeding column 30 is supported and rotates within the housing 50 by the upper drive shaft 34 and bearings. A driven gear 22 is coaxially fixed on the drive shaft 34, which meshes with the drive gear 211 driven by the power motor 21, thereby driving the entire feeding column 30 to rotate at high speed.

[0035] In actual implementation, the power component 20 can also be driven by a belt drive mechanism or a chain drive mechanism as used in the prior art.

[0036] 2. Feeding assembly 10

[0037] like Figure 4 As shown, the feeding assembly 10 mainly includes an installation cylinder 11, a feeding motor 12, a bar storage box 13, and a pressing part 14.

[0038] like Figure 1 , Figure 4 and Figure 6 As shown, the mounting cylinder 11 is fixed to the top of the outer casing 50. A guide sleeve 111 is fixed to the lower part of its inner cavity. The lower port of the guide sleeve 111 is directly opposite to and connected to the upper port of the bar feeding channel 32, so as to realize the conveying of the bar 60 to the bar feeding channel 32.

[0039] like Figure 4 As shown, the guide sleeve 111 has a feed notch 112 on its side wall. The bar storage box 13 is fixed to the outside of the mounting cylinder 11, and its interior has a storage channel that can store multiple bars 60 side by side. One end of the storage channel leads to the feed notch 112, and the other end is provided with an elastic part that continuously pushes the bars 60 toward the feed notch 112. Specifically, as... Figure 4As shown, the elastic part includes a pusher spring 131 fixed to the bar storage box 13 for generating elastic thrust, and a pusher plate 132 fixed to the other end of the pusher spring 131. The pusher plate 132 increases the contact area with the bar 60, ensuring that the bar 60 is stably pushed along the storage channel towards the feed notch 112. In actual implementation, the elastic part can also be an industrially adaptable elastic structure such as an elastic pressure plate.

[0040] like Figure 4 As shown, the pressing part 14 is slidably disposed in the upper part of the inner cavity of the mounting cylinder 11 along the axial direction of the mounting cylinder 11. A pressing rod 142 is fixed at its bottom and an inclined groove 141 is provided at its top. The power shaft 121 driven by the feeding motor 12 runs through the upper part of the mounting cylinder 11, and a wedge 122 is fixed on it. With the wedge 122 located at the lowest point of the inclined groove 141 as the initial position, when the power shaft 121 rotates, the wedge 122 is embedded in the inclined groove 141 and forms an inclined wedge engagement with it, pushing the pressing part 14 to move downward against the elastic force of the return spring 15 (process). The pressing rod 142 then inserts into the guide sleeve 111, pressing the bar 60 located therein downward into the rotating bar feeding channel 32. When the wedge 122 rotates away from the inclined groove 141 and moves back to directly above (upper edge) the bottom of the inclined groove 141, the pressure part 14 drives the pressure rod 142 to return upward under the action of the return spring 15. At the same time, the wedge 122 returns to the lowest point of the inclined groove 141. When the pressure rod 142 is raised to expose the feed notch 112, the next bar 60 automatically rolls into the inner cavity of the guide sleeve 111 under the push of the elastic part, waiting for the next pressing. This cycle is repeated to realize the intermittent automatic feeding and pressing of the bar 60.

[0041] It is precisely because of the downward compression of the bar 60 that the bottom end of the bar 60 in the rotating bar feeding channel 32 experiences intense friction with the bottom wall of the bar feeding channel 32 (near the extrusion hole 33), generating a high-temperature plastic fluid (i.e., fluid material), which is then extruded from the extrusion hole 33 at the bottom end of the feeding column 30.

[0042] In actual implementation, such as Figure 5 As shown, the bar 60 preferably has coaxially arranged anti-rotation grooves 61 and anti-rotation inserts 62 at both ends. When two bars 60 are connected coaxially end to end, an anti-rotation fit can be formed between the anti-rotation grooves 61 and the anti-rotation inserts 62 of the two bars 60. Figure 2 As shown, this allows the bar 60 located in the bar feeding channel 32 to form approximately a whole, thereby ensuring that the bottom bar 60 can stably rotate and rub relative to the bar feeding channel 32.

[0043] Of course, in actual implementation, the above-mentioned feeding component 10 can also adopt the feeding and pressing method of a robot arm and a cylinder commonly used in the prior art. A cylinder that extends and retracts along the axial direction of the bar feeding channel 32 is set directly above the bar feeding channel 32. Initially, the cylinder avoids the robot arm to grab the bar 60 and place it in the bar feeding channel 32. After that, the cylinder presses the bar 60 downward from directly above the bar feeding channel 32, which can also realize the feeding and pressing of the bar 60. However, this embodiment requires a high degree of cooperation between the cylinder and the robot arm and has a high cost. Therefore, the embodiment of the above-mentioned feeding component 10 provided in this application is preferred.

[0044] 3. Powder supply component 40

[0045] like Figure 1 , Figure 2 and Figure 4 As shown, an annular friction cavity 51 is formed between the lower outer wall of the feeding column 30 and the inner wall of the outer shell 50. On the feeding column 30, the column portion located above the friction cavity 51 has powder conveying threads 31 machined on its outer periphery. This column portion, together with the inner wall of the outer shell 50, constitutes a spiral conveying mechanism for conveying powder to the friction cavity 51. Preferably, the powder supply assembly 40 is used to supply metal or alloy powder (the same material as the rod 60) to the spiral conveying mechanism (i.e., the column section on the feeding column 30 with the powder conveying threads 31). Compared to directly conveying powder to the friction cavity 51 through a pipe, the feeding is more uniform and can continuously generate a thrust towards the friction cavity 51, ensuring stable entry of the powder into the friction cavity 51. Simultaneously, during the spiral feeding process, the powder is preheated through initial friction, ensuring that the powder is fully plasticized in the friction cavity 51.

[0046] like Figure 7 As shown, the powder supply assembly 40 includes a powder feeding guide box 47 fixed to the outer casing 50. The powder feeding guide box 47 communicates with the inner cavity of the outer casing 50 through a feeding port, and the powder feeding pipe 42 continuously supplies powder to the feeding port. A reciprocating sliding powder pushing rack 41 is provided inside the powder feeding guide box 47 as a pushing part (specifically, a crank-slider structure as described in this application can be used, or a linear reciprocating drive structure such as a cylinder or a lead screw-slider can be used). The teeth of the powder pushing rack 41 face upwards and mesh with a connecting gear 43. A transmission lead screw 44 is coaxially fixed to the connecting gear 43, and a sliding baffle 45 is screwed onto the lead screw, forming a lead screw-slider structure.

[0047] When the powder feeding motor 46 drives the powder pushing rack 41 to slide away from the feed port via the crank connecting rod 461, the meshing drive gear 43 rotates, which in turn drives the transmission screw 44 to rotate, causing the sliding baffle 45 to move and block the feed port, preventing powder from leaking in. When the powder pushing rack 41 slides towards the feed port under the drive of the crank connecting rod 461, the sliding baffle 45 moves synchronously to open the feed port. At the same time, the end of the powder pushing rack 41 pushes the powder accumulated at the feed port into the gap between the inner wall of the outer shell 50 and the powder conveying thread 31. The rotating powder conveying thread 31 conveys this powder downward to the friction chamber 51. This linkage between the powder pushing rack 41 and the sliding baffle 45 does not require an additional power structure to drive the sliding baffle 45. The mechanical linkage ensures the stability of their cooperation.

[0048] Since the powder supply is primarily used during the brief intermittent period of "lifting the pressure bar 142 - continuing feeding," the fluid material formed by the powder continues to be supplied at its own pace, ensuring a continuous supply of material at the additive outlet 522. Its frictional heat can also compensate for the instantaneous drop in frictional heat of the rod 60. This means that powder replenishment does not need to be absolutely continuous, as the friction chamber 51 itself has a certain volume, which can temporarily store a small amount of powder and continuously generate frictional heat. The intermittent but stable frequency of powder feeding is precisely designed to supply material during the brief intermittent periods of the main material supply to the rod 60, maintaining the dynamic balance of material and heat within the friction chamber 51.

[0049] Obviously, this application uses an intermittent pulse feeding method with the powder-pushing rack 41. First, the volume of powder pushed by the intermittent pushing action (i.e., driven by the crank connecting rod 461 to push the powder-pushing rack 41) is basically constant in each stroke. By adjusting the speed or stroke of the crank, the amount of powder fed into the system per unit time can be precisely controlled, which is convenient for matching with the feeding speed of the bar 60. This ensures stable feeding during the short interval of the feeding assembly 10 when the "pressure rod 142 is lifted - feeding continues", and also stably maintains the dynamic balance of material and heat in the friction chamber 51.

[0050] Secondly, the linkage mechanism between the sliding baffle 45 and the feeding port ensures that when the pushing part retracts to prepare for the next pushing, the sliding baffle 45 closes simultaneously, physically isolating the powder feeding pipe 42, the powder feeding guide box 47, and the internal high-pressure friction chamber 51. This effectively prevents powder from being accidentally sucked in by the negative pressure or cyclone caused by the rotating parts in the friction chamber 51 during non-powder feeding times, or prevents powder from flowing by gravity, thus avoiding uncontrollable powder loss and contamination.

[0051] Finally, the reciprocating sliding of the pusher section can produce a slight compaction and shearing effect on the powder at the feed port, which can prevent the powder from accumulating and clogging at the inlet and ensure the long-term reliability of the feeding.

[0052] like Figure 2 As shown, in the friction chamber 51, the powder rubs against the outer wall of the high-speed rotating feed column 30 and the inner wall of the outer shell 50, rapidly generating heat and plasticizing to form a fluid material that flows downward along the chamber wall.

[0053] Of course, those skilled in the art will recognize that the present invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0054] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0055] The technologies, shapes, and structures not described in detail in this invention are all known technologies.

Claims

1. A stirring friction additive manufacturing device for simultaneous feeding of powder and rod materials, characterized in that, The device includes a housing (50), a feeding column (30) that rotates within the housing (50), a bar feed channel (32) coaxially arranged within the feeding column (30), and a feeding assembly (10) that supplies bars (60) to the bar feed channel (32) and can press the bars (60) downwards. The feeding column (30) has an extrusion hole (33) at its bottom end that connects to the bottom of the bar feed channel (32) to discharge the bar (60) after frictional plasticization with the bottom wall of the bar feed channel (32). Fluid material; a friction cavity (51) is formed between the lower outer edge of the feeding column (30) and the outer shell (50). A powder feeding assembly (40) for supplying powder to the friction cavity (51) is provided on the side wall of the outer shell (50). The fluid material is formed by friction and plasticization of the cavity wall of the friction cavity (51) and the powder. The bottom end of the outer shell (50) also has a converging cavity (521) that connects the extrusion hole (33) and the bottom of the friction cavity (51). The bottom of the converging cavity (521) has an additive outlet (522) for discharging the fluid material.

2. The stirring friction additive manufacturing device for simultaneous feeding of powder and rod materials according to claim 1, characterized in that, The feed column (30) is provided with a powder conveying thread (31) on the outer periphery of the column above the friction cavity (51). The column section with the powder conveying thread (31) and the inner wall of the outer shell (50) together form a spiral conveying mechanism for supplying powder to the friction cavity (51). The discharge end of the powder supply assembly (40) points to the column section with the powder conveying thread (31) on the feed column (30).

3. The stirring friction additive manufacturing device for simultaneous feeding of powder and rod materials according to claim 2, characterized in that, The powder feeding assembly (40) includes a powder feeding guide box (47) fixed on the outer shell (50). A powder feeding pipe (42) for supplying powder is provided at the feeding port of the powder feeding guide box (47) that connects to the inner cavity of the outer shell (50). A pushing part is provided in the inner cavity of the powder feeding guide box (47) that slides back and forth toward the feeding port. The two side walls and the bottom wall of the pushing part along the sliding direction are in contact with the box wall of the powder feeding guide box (47). When the pushing part slides toward the feeding port, it pushes the powder into the inner side of the outer shell (50).

4. The stirring friction additive manufacturing device for simultaneous feeding of powder and rod materials according to claim 3, characterized in that, The pushing part is a powder pushing rack (41), with the tooth surface of the powder pushing rack (41) facing upwards, and the length direction of the powder pushing rack (41) is arranged along its sliding direction. The powder feeding guide box (47) is rotatably fitted with a connecting gear (43) that meshes with the powder pushing rack (41). A transmission screw (44) is coaxially fixed on the connecting gear (43). A sliding baffle (45) is threaded onto the transmission screw (44) and forms a screw-slider structure together with the transmission screw (44). When the powder pushing rack (41) slides away from the feeding port, the sliding baffle (45) slides to cover the feeding port. When the powder pushing rack (41) slides toward the feeding port, the sliding baffle (45) slides to open the feeding port.

5. The stirring friction additive manufacturing device for simultaneous feeding of powder and rod materials according to claim 3, characterized in that, The powder feeding guide box (47) is equipped with a powder feeding motor (46) on its side wall. The output end of the powder feeding motor (46) is equipped with a crank connecting rod (461) that connects to the pusher part. The powder feeding motor (46), the crank connecting rod (461) and the pusher part together form a crank sliding mechanism that drives the pusher part to slide back and forth.

6. A stirring friction additive manufacturing device for simultaneous feeding of powder and rod materials according to any one of claims 1-5, characterized in that, The feeding assembly (10) includes a mounting cylinder (11). The lower part of the inner cavity of the mounting cylinder (11) has a guide sleeve (111) for guiding rods (60). The guide sleeve (111) is coaxially arranged above the rod feeding channel (32) and the two are connected to each other. The upper part of the inner cavity of the mounting cylinder (11) has a pressure rod (142) that reciprocates with the inner cavity of the guide sleeve (111). The side wall of the guide sleeve (111) has a feeding notch (112) extending to the outside of the mounting cylinder (11). The side wall of the mounting cylinder (11) is equipped with a feeding module that continuously supplies rods (60) to the feeding notch (112) so that when the pressure rod (142) returns to the upper part of the feeding notch (112), the rods (60) slide into the inner cavity of the guide sleeve (111).

7. The stirring friction additive manufacturing device for simultaneous feeding of powder and rod materials according to claim 6, characterized in that, The feeding module includes a bar storage box (13). The inner cavity of the bar storage box (13) has a storage channel for placing bars (60) side by side. One end of the storage channel is connected to the feeding notch (112), and the other end of the storage channel is provided with an elastic part that elastically squeezes the bars (60) towards the feeding notch (112).

8. The stirring friction additive manufacturing device for simultaneous feeding of powder and rod materials according to claim 6, characterized in that, The upper part of the inner cavity of the mounting cylinder (11) is axially slidably fitted with a pressing part (14), and a pressing rod (142) is fixed at the bottom end of the pressing part (14). The upper part of the pressing part (14) is provided with an inclined groove (141). The upper part of the inner cavity of the mounting cylinder (11) is also rotatably fitted with a power shaft (121) driven by a feeding motor (12). The side wall of the power shaft (121) is fixed with a wedge (122) that forms an inclined wedge fit with the inclined groove (141) to drive the pressing part (14) to slide downward, so as to constitute the process movement of the reciprocating insertion action. The mounting cylinder (11) is also provided with a return spring (15) that drives the pressing part (14) to return upward, so as to constitute the return movement of the reciprocating insertion action.

9. A stirring friction additive manufacturing device for simultaneous feeding of powder and rod materials according to any one of claims 1-5, characterized in that, The bottom of the outer shell (50) is a detachable collection cover (52), the inner cavity of the collection cover (52) is conical, the inner cavity of the collection cover (52) constitutes the converging cavity (521), and the additive outlet (522) is located at the lower cone of the converging cavity (521).

10. A stirring friction additive manufacturing device for simultaneous feeding of powder and rod materials according to any one of claims 1-5, characterized in that, The upper diameter of the feed column (30) is reduced to form a drive shaft (34). The drive shaft (34) is rotated and fitted in the inner cavity of the housing (50) through a bearing. The power assembly (20) includes a drive gear (211) driven by a power motor (21) and a driven gear (22) coaxially fixed on the drive shaft (34) to mesh with the drive gear (211).

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