A friction stir additive manufacturing device and manufacturing method based on bar shearing

Abstract

The present invention discloses a friction stir additive manufacturing device and manufacturing method based on rod shearing, including a silo, a feeding port is provided at the lower end of the silo; a variable disc device is provided at the lower end of the silo, the variable disc device has a material guide through hole with adjustable size and docking with the feeding port; a cutting mechanism is provided below the variable disc device, and is used to cut the material passing through the variable disc device into a disc shape; a feeding mechanism is provided below the cutting mechanism, and a material receiving assembly is provided at one end of the feeding mechanism; a stirring device is docked with the material receiving assembly, and is used to receive and stir the disc-shaped material conveyed from the material receiving assembly, the stirring device includes a stationary body and a rotating member located at the center of the stationary body and rotating relatively, a stirring component is installed on the rotating member, and a feeding channel is provided inside the rotating member; a heating device is provided on the lower outer side of the rotating member. The present invention can solve various shortcomings in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of friction stir welding additive manufacturing, and specifically relates to a friction stir additive manufacturing device and manufacturing method based on bar shearing. Background Art

[0002] Additive manufacturing technology, also known as 3D printing technology, can form three-dimensional complex shapes by stacking materials layer by layer in a two-dimensional plane. Additive manufacturing technology is mainly applicable to the forming manufacturing of complex parts, which can greatly improve the mechanical properties of additive manufacturing parts, enhance the structural utilization rate of manufacturing components, and has great application value in the research and development, manufacturing, maintenance, and upgrading of major national defense facilities and equipment. Generally, the supply materials for friction stir additive manufacturing can be filamentous, powder-like, and bar materials, etc. The wire materials cannot fully friction with the substrate, and the generated frictional heat is not sufficient to fully plasticize the materials, resulting in discontinuous deposition layer thickness; when using powder materials, it is difficult to control their deposition direction during the rotation of the main shaft, resulting in uneven deposition layer thickness, and thus some common production defects will occur, such as cracks, pores, etc. When using bar materials for additive manufacturing, it is not easy to achieve continuous feeding of the materials, resulting in discontinuous additive manufacturing process, interlayer delamination of the deposition layer, etc., which seriously restricts the additive manufacturing efficiency and additive manufacturing quality of friction stir deposition additive manufacturing. Therefore, there is an urgent need for a new technology to improve the main difficult problems of existing bar additive manufacturing.

[0003] In addition, in the existing friction stir additive manufacturing devices in the prior art, heat is generated through various auxiliary heating methods to increase the temperature of the materials, causing plastic deformation, flowing out through heat melting. The common methods for generating heat mainly include the following: generating heat by relative rotation for friction, generating heat by extrusion, and an external heat source auxiliary device.

[0004] Generating heat by friction is the mainstream method in the current friction stir additive manufacturing technology and is widely used. Its main advantages are easy to implement, the overall structure is small, it is convenient to reduce the machine size, the additional upsetting force does not need to be too large, and the expected effect can be achieved by using a pneumatic system or a micro motor. Its production efficiency is high, and it is generally applicable to filamentous or powder-like materials. The disadvantage is that the wear is relatively serious. Generally, in order to reduce wear, some special treatments need to be continued. Generating heat by extrusion mainly uses bar materials, the material range is relatively limited, the required upsetting force is large, it can be driven by a hydraulic system, the heat required to heat the bar materials is high, a heat source auxiliary device can be equipped for heating, the structure is relatively complex, and the production cost is high.

[0005] The heat source auxiliary device generally adopts an eddy current heating device. Eddy current heating uses eddy currents to heat metal conductors. The metal to be heated is placed in a high-frequency changing electromagnetic field. A strong electromagnetic field forms induced eddy currents on its surface. Relying on the internal resistance of the material itself, it quickly generates heat to heat the stirring head and the materials inside it, making it flow out through thermal plasticization.

[0006] In summary, the main disadvantages of the current known technologies are as follows:

[0007] 1. The bar stock sizes applicable to a device are limited, and it is unable to adapt to the processing of bar stocks of different sizes;

[0008] 2. It is difficult to achieve continuous feeding of materials, greatly reducing the production speed and thus the production efficiency of products;

[0009] 3. The existing friction additive manufacturing has low additive efficiency, a large load applied during the additive process, and poor manufacturing flexibility, which is not conducive to manufacturing complex parts;

[0010] 4. The existing additive manufacturing has a large machining allowance. After additive manufacturing is completed, the friction stir billet still needs to be machined mechanically later to remove the excess substrate part, resulting in low material utilization rate;

[0011] 5. Technical limitations such as poor bonding strength of the additive layer and narrow applicable range of the additive process;

[0012] 6. In the existing additive manufacturing device, the material is not thoroughly thermoplastified, the heat is unevenly distributed, and defects are likely to occur during the additive manufacturing process.

[0013] To solve the above problems, Chinese invention patent CN202110284601.X discloses a granular friction stir additive manufacturing device and method. The device provides a wire shearing mechanism, including a base and a cutting part with a cutting edge. The cutting edge intermittently cuts the wire fed through the wire guiding hole and feeds it into the main shaft with the base as the rotation center. Although this method realizes the continuous feeding of the filamentous material through the combination of the base and the cutting part, since the wire is relatively soft, it cannot fully friction with the substrate, resulting in insufficient frictional heat generated, and thus insufficient plasticization of the material.

[0014] In addition, Chinese invention patent CN202110134068.9 discloses a friction stir additive manufacturing device and method with a wire as the feedstock. This method supplies the wire to the hollow cavity through a wire feeder, extrudes the wire into a rod-shaped wire through the movement of an extrusion part, and generates heat by friction with the substrate to achieve friction stir additive manufacturing. However, compared with the bar stock, the rod-shaped wire has very poor density, and the thickness of the deposited layer formed after material plasticization will be uneven. Summary of the Invention

[0015] The present invention provides a friction stir additive manufacturing device and manufacturing method based on bar shearing, which can solve various problems in the prior art.

[0016] To achieve the above object, in a first aspect, the present invention provides the following technical solution: A friction stir additive manufacturing device based on bar shearing, comprising a material bin, with a material discharge opening provided at its lower end; a variable disk device provided at the lower end of the material bin, the variable disk device having a material guiding through-hole with adjustable size and docked with the material discharge opening; a cutting mechanism provided below the variable disk device for cutting the material passing through the variable disk device into a disk shape; a feeding mechanism provided below the cutting mechanism, one end of the feeding mechanism being cooperatively provided with a material receiving component; a stirring device docked with the material receiving component for receiving and stirring the disk-shaped material conveyed from the material receiving component, the stirring device including a stationary main body and a rotating member that rotates relative to the center of the stationary main body, a stirring component being installed on the rotating member, and a material discharge channel being provided inside the rotating member for the stirred material to be discharged from the lower end of the material discharge channel; a heating device provided on the outer side of the lower part of the rotating member.

[0017] Preferably, the feeding mechanism includes a bottom plate and a lead screw provided on the upper side of the bottom plate, a workbench that moves left and right being cooperatively provided on the lead screw, a feeding disk being provided on the upper side of the workbench, and a push plate that can be translated being provided at one end of the feeding disk, the push plate being driven by a push cylinder on the workbench to push out the disk-shaped material on the feeding disk.

[0018] Preferably, the material receiving component includes a material receiving port and a flexible hose connected to the lower end of the material receiving port, the material receiving port corresponding to one end of the feeding mechanism, and a blowing device for blowing air into the material receiving port being provided on the material receiving port.

[0019] Preferably, the cutting mechanism includes a pair of oppositely arranged cutting knives, the cutting knives being driven by corresponding cutting cylinders to move relative to each other to cut the material.

[0020] Preferably, the stationary main body has a conical structure with an open upper end, the stirring component being provided inside the stationary main body, and a feeding port corresponding to the inner bottom of the stationary main body being provided on the side wall of the rotating member below the stirring component, the feeding port being communicated with the material discharge channel inside the rotating member.

[0021] Preferably, the heating device includes a cylindrical heating chamber, a plurality of electric heating rods being axially inserted into the heating chamber, and the heating chamber being sleeved on the outer side of the lower part of the rotating member.

[0022] Preferably, the variable disk device includes a top plate and a bottom plate arranged coaxially, a plurality of clamping sliders being arranged around the center between the top plate and the bottom plate, the clamping sliders being provided with sliding grooves, the clamping sliders being movably connected to the top plate or the bottom plate, and the clamping sliders moving along the sliding grooves when the top plate and the bottom plate rotate relative to each other.

[0023] Preferably, both the feeding mechanism and the cutting mechanism are installed in a box body, and the variable disc device is installed on the upper side of the box body.

[0024] In a second aspect, the present invention further provides a manufacturing method of the friction stir additive manufacturing device according to the first aspect. The materials are centrally placed in a silo. Before production, the size of the material guiding through hole of the variable disc device is adjusted according to the size of the material diameter. The materials in the silo are cut into a disc shape by the cutting mechanism after passing through the material guiding through hole. The disc-shaped materials fall into the feeding tray and then enter the stationary main body and the rotating part of the feeding mechanism through the material receiving assembly. Under the action of the auxiliary heating device around the outside of the rotating part, the disc-shaped materials continuously flow out from the through hole at the bottom of the rotating part and are uniformly thermoplastified.

[0025] During additive manufacturing, the distance between the lower end surface of the rotating part and the surface to be additively manufactured is adjusted so that when the additive is extruded from the lower end surface of the rotating part, it can contact the surface to be additively manufactured. The materials extruded by friction stir and the surface to be additively manufactured are used to form a joint part in a non-molten state with the surface to be additively manufactured. Among them, the surface to be additively manufactured is the substrate surface and / or the joint part surface. After the additive material contacts the surface to be additively manufactured, it is friction stir heated and fully plasticized between the lower end surface of the stirrer and the surface to be additively manufactured. The process temperature is 60% - 90% of the material melting point, and an interatomic bonding layer is formed with the surface to be additively manufactured in a non-molten state, thereby forming a joint part. At the same time, the rotating part of the additive manufacturing equipment moves parallel along a preset track to complete the single-layer additive manufacturing process.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] The cutting edge is driven by a cylinder for cutting. While meeting a certain cutting force, it can perform cutting smoothly, cutting the rod-shaped material into disc-shaped pieces, providing a new way of utilizing the rod-shaped material; a feeding mechanism and a material receiving component that combine static and dynamic states are adopted. Under the action of centrifugal force and gravity, the material enters the interior of the stirring main body at high speed; a variable disc device with adjustable diameter is adopted. Within the diameter adjustment range, it not only ensures stable feeding but also achieves the purpose of single-piece feeding, realizing stepless adjustment of the rod diameter; a lead screw is combined with a pushing cylinder, moving alternately with each other. First, the feeding disc is moved to the specified position through the ball screw, and then the pushing cylinder is moved to push out the pushing plate, which not only shortens the stroke of the feeding part but also can stably and accurately feed the material into the specified device; a blowing device is used for auxiliary feeding, enabling the disc-shaped material to smoothly enter the stirring head through the pipeline, avoiding material blockage, ensuring stable feeding. At the same time, the side feeding method is adopted, without starting and stopping the rotating part, and the feeding is relatively uniform, improving the efficiency of additive manufacturing. At the same time, the stirring head can promote dynamic recrystallization of grains, thereby promoting grain refinement and reducing production defects; an external heating device is adopted. Through the electric heating rod, the medium in the heating chamber is heated, and the heat is transferred to the interior of the rotating part, making the internal material thermoplasticized. A heat insulation sleeve is provided outside the heating chamber to prevent heat loss. By adjusting the power of the electric heating rod and the type of heating medium, the heating temperature can be changed. The stirring device can generate a rotational friction effect on the material, and the heating device can generate a continuous heating effect, so as to generate a large amount of heat, accelerate the thermoplasticization of the material, and at the same time make the thermoplasticization more thorough, effectively reducing the problems of discontinuous additive layers and low material utilization rate in traditional additive manufacturing. Description of the Drawings

[0028] Figure 1 It is a front view schematic diagram of the overall structure of the present invention;

[0029] Figure 2 It is a side view schematic diagram of the overall structure of the present invention;

[0030] Figure 3 It is a three-dimensional structure diagram of the feeding mechanism of the present invention;

[0031] Figure 4 It is a structural schematic diagram of the variable disc device of the present invention;

[0032] Figure 5 It is a three-dimensional structure diagram of the heating device of the present invention;

[0033] Figure 6 It is a front view sectional structure diagram of the stirring device of the present invention.

[0034] Reference Signs:

[0035] 1. Bin, 11. Feed tray, 12. Blower, 13. Motor, 14. Coupling, 15. Pusher, 16. Workbench, 17. Screw, 18. Bottom plate, 19. Top plate, 2. Variable disc device, 20. Clamping slider, 21. Chassis, 22. Electric heating rod, 23. Heating bin end cover, 24. Heating bin, 25. Shoulder end cover, 26. Stirring component, 27. Bearing end cover, 28. Bearing, 29. Feed port, 3. Box, 31. Slide, 4. Receiving port, 5. Hose, 6. Stationary body, 7. Heating device, 8. Rotating part, 9. Cutting mechanism, 10. Pusher cylinder. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0037] like Figures 1-6 As shown, in order to solve various technical problems in the prior art, the present invention provides the following technical solutions: a stir friction additive manufacturing device based on rod shearing, comprising a silo 1, a lower end of which is provided with a feeding port; a variable disc device 2, arranged at the lower end of the silo 1, the variable disc device 2 having a material guide through hole with adjustable size and docking with the feeding port; a cutting mechanism 9, arranged below the variable disc device 2, for cutting the material passing through the variable disc device 2 into a disc shape; a feeding mechanism, arranged below the cutting mechanism 9, one end of the feeding mechanism is provided with a material receiving assembly; a stirring device, docking with the material receiving assembly, for receiving and stirring the disc-shaped material transported from the material receiving assembly, the stirring device comprising a stationary body 6 and a rotating member 8 located at the center of the stationary body 6 and rotating relatively, the rotating member 8 being provided with a stirring component 26, the rotating member 8 being provided with a feeding channel inside, for the stirred material to be discharged from the lower end of the feeding channel; a heating device 7, arranged on the lower outer side of the rotating member 8.

[0038] Specifically, the feeding mechanism can quickly transport the disc-shaped material to the position corresponding to the material receiving component, and the material receiving component can make the position between the feeding mechanism and the stirring device more flexible, and the stirring component 26 in the stirring device can crush and stir the material, wherein the feeding mechanism includes a base plate 18 and a screw rod 17 arranged on the upper side of the base plate 18, the screw rod 17 is driven to rotate by a motor 13 at one end thereof, and the main shaft of the motor 13 is connected to the screw rod 17 through a coupling 14, and a workbench 16 that can move left and right is provided on the screw rod 17, and a feeding tray 11 is provided on the upper side of the workbench 16, and a push plate 15 that can be moved translationally is provided at one end of the feeding tray 11, and the push plate 15 is driven by the push cylinder 10 on the workbench 16 to push the disc-shaped material on the feeding tray 11, and the screw rod 17 can realize accurate and fast transportation of the workbench 16.

[0039] The variable disk device 2 can limit the diameter of the material falling from the silo 1, and the diameter of the material guiding through-hole of the variable disk device 2 can be adjusted and changed, realizing stepless adjustment of the bar diameter. Specifically, the variable disk device 2 includes a top plate 19 and a chassis 21 arranged coaxially. Between the top plate 19 and the chassis 21, several clamping sliders 20 are arranged around the center. A chute 31 is arranged on the clamping slider 20. The clamping slider 20 is movably connected to the top plate 19 or the chassis 21. When the top plate 19 and the chassis 21 rotate relative to each other, the clamping slider 20 moves along the chute 31. All the clamping sliders 20 will slide synchronously along the corresponding chutes 31. The material guiding through-hole has a polygonal structure, which can effectively clamp the material and play a guiding role in cutting. The adjustable size range is 5 - 50 mm.

[0040] In this embodiment, the material receiving assembly includes a material receiving port 4 and a hose 5 connected to the lower end of the material receiving port 4. The material receiving port 4 corresponds to one end of the feeding mechanism. A blowing device 12 for blowing air into the material receiving port 4 is arranged on the material receiving port 4. The blowing device 12 assists in feeding, enabling the disc-shaped material to smoothly pass through the hose 5 and enter the stirring device, avoiding material blockage and ensuring stable feeding. The blowing devices 12 are arranged in two rows side by side, which can ensure that all the falling disc-shaped materials can be blown.

[0041] As an embodiment of the cutting mechanism 9, the cutting mechanism 9 includes a pair of cutting knives arranged opposite to each other. The cutting knives are driven by corresponding cutting cylinders to move relative to each other to cut the material. This is a new cutting method.

[0042] In this embodiment, the stationary main body 6 has a conical structure with an open upper end. The stirring member 26 is arranged inside the stationary main body 6. An inlet port 29 corresponding to the inner bottom of the stationary main body 6 is arranged on the side wall of the rotating member 8 below the stirring member 26. The inlet port 29 is communicated with the material discharging channel inside the rotating member 8. The conical structure can concentrate the material towards the bottom. A shoulder end cover 25 is arranged at the top of the stationary main body 6, which is convenient for sealing the inner cavity of the stationary main body 6, so that the material conveyed by the hose 5 will not fly out during stirring.

[0043] Meanwhile, a bearing 28 is installed between the outer side of the rotating member 8 and the stationary main body 6. The bearing 28 is located below the inlet port 29. A bearing end cover 27 is installed on the upper side of the bearing 28, which can prevent materials from entering the bearing 28.

[0044] In this embodiment, as Figure 5As shown in the figure, the heating device includes a cylindrical heating chamber 24, in which a number of electric heating rods 22 are axially inserted. The heating chamber 24 is sleeved on the outer side of the lower part of the rotating member 8. A heat insulation layer can be provided on the outer side of the heating chamber 24 to enhance the heating effect. One end of the heating chamber 24 is provided with a heating chamber end cover 23 for connecting with the rotating member 8.

[0045] To protect the cutting and conveying of the material and prevent the material from being contaminated, the feeding mechanism and the cutting mechanism 9 are both installed in a box body 3, and the variable disc device 2 is installed on the upper side of the box body 3.

[0046] As a specific embodiment of the present invention:

[0047] During manufacturing, the materials are centrally placed in the material bin 1. Before production, the size of the material guiding through hole of the variable disc device 2 is adjusted according to the diameter of the material. The materials in the material bin 1 are cut into discs by the cutting mechanism 9 after passing through the material guiding through hole. The disc-shaped materials fall into the feeding disc 11 and then enter the stationary main body 6 and the rotating member 8 of the feeding mechanism through the receiving component. Under the action of the auxiliary heating device around the outside of the rotating member 8, the disc-shaped materials continuously flow out from the through hole at the bottom of the rotating member 8 and are evenly thermoplastified;

[0048] During additive manufacturing, the distance between the lower end surface of the rotating member 8 and the surface to be additively manufactured is adjusted so that when the additive is extruded from the lower end surface of the rotating member 8, it can contact the surface to be additively manufactured, stirring the extruded material and the surface to be additively manufactured, so that the extruded material forms a joint with the surface to be additively manufactured in a non-molten state. Among them, the surface to be additively manufactured is the substrate surface and / or the surface of the joint. After the additive material contacts the surface to be additively manufactured, it is friction stir heated and fully plasticized between the lower end surface of the stirrer and the surface to be additively manufactured, and the process temperature is 60% - 90% of the melting point of the material, forming an interatomic bonding layer with the surface to be additively manufactured in a non-molten state, thereby forming a joint. At the same time, the rotating member 8 of the additive manufacturing equipment moves parallel along a preset track to complete the single-layer additive manufacturing process.

[0049] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a certain specific posture (as shown in the drawings). If this specific posture changes, the directional indications will also change accordingly.

[0050] In addition, in the present invention, descriptions such as "first", "second", etc. are for descriptive purposes only, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0051] In the present invention, unless otherwise clearly specified and defined, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In addition, the technical solutions between various embodiments of the present invention can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A friction stir additive manufacturing device based on bar shearing, characterized in that, include: A material bin (1) having a material discharge port at its lower end; A variable disc device (2) is arranged at the lower end of the silo (1), wherein the variable disc device (2) has a material guiding through hole with adjustable size and docking with the material discharge port; A cutting mechanism (9) is arranged below the variable disc device (2) and is used to cut the material passing through the variable disc device (2) into a disc shape; A feeding mechanism is arranged below the cutting mechanism (9), and one end of the feeding mechanism is provided with a material receiving assembly; A stirring device is connected to the material receiving assembly and is used to receive and stir the disc-shaped material delivered from the material receiving assembly. The stirring device comprises a stationary body (6) and a rotating member (8) located at the center of the stationary body (6) and relatively rotating. A stirring component (26) is installed on the rotating member (8). A material discharge channel is provided inside the rotating member (8) so that the stirred material can be discharged from the lower end of the material discharge channel. The heating device (7) is arranged on the lower outer side of the rotating member (8).

2. The friction stir additive manufacturing device based on bar shearing according to claim 1, characterized in that: The feeding mechanism comprises a bottom plate (18) and a screw rod (17) arranged on the upper side of the bottom plate (18); a workbench (16) movable left and right is arranged on the screw rod (17); a feeding tray (11) is arranged on the upper side of the workbench (16); a push plate (15) movable in translation is arranged at one end of the feeding tray (11); the push plate (15) is driven by a push cylinder (10) on the workbench (16) to push out the disc-shaped material on the feeding tray (11).

3. The friction stir additive manufacturing device based on bar shearing according to claim 1, characterized in that: The material receiving assembly comprises a material receiving port (4) and a hose (5) connected to the lower end of the material receiving port (4); the material receiving port (4) corresponds to one end of the feeding mechanism; and the material receiving port (4) is provided with a blowing device (12) for blowing air into the material receiving port (4).

4. The friction stir additive manufacturing device based on bar shearing according to claim 1, characterized in that: The cutting mechanism (9) comprises a pair of cutting knives arranged opposite to each other, and the cutting knives are driven by corresponding cutting cylinders to move relative to each other to cut the material.

5. The friction stir additive manufacturing device based on bar shearing according to claim 1, characterized in that: The stationary body (6) is a conical structure with an opening at the upper end, the stirring component (26) is arranged inside the stationary body (6), and a feed port (29) corresponding to the inner bottom of the stationary body (6) is arranged on the side wall of the rotating component (8) below the stirring component (26), and the feed port (29) is connected to the discharge channel inside the rotating component (8).

6. The friction stir additive manufacturing device based on bar shearing according to claim 1, characterized in that: The heating device comprises a cylindrical heating chamber (24), a plurality of electric heating rods (22) are axially inserted into the heating chamber (24), and the heating chamber (24) is sleeved on the lower outer side of the rotating member (8).

7. The friction stir additive manufacturing device based on bar shearing according to claim 1, characterized in that: The variable disc device (2) comprises a coaxially arranged top plate (19) and a bottom plate (21), a plurality of clamping sliders (20) are arranged around the center between the top plate (19) and the bottom plate (21), a slide groove (31) is arranged on the clamping slider (20), the clamping slider (20) is movably connected to the top plate (19) or the bottom plate (21), and when the top plate (19) and the bottom plate (21) rotate relative to each other, the clamping slider (20) moves along the slide groove (31).

8. The friction stir additive manufacturing device based on bar shearing according to claim 1, characterized in that: The described feeding mechanism and cutting mechanism (9) are both installed inside a box body (3), and the variable disc device (2) is installed on the upper side of the box body (3).

9. A manufacturing method of the friction stir additive manufacturing device based on bar shearing according to any one of claims 1-8, characterized in that, The materials are centrally placed in the storage bin (1). Before production, the size of the material guiding through-hole of the variable disc device (2) is adjusted according to the diameter of the materials. The materials in the storage bin (1) pass through the material guiding through-hole and are cut into disc shapes by the cutting mechanism (9). The disc-shaped materials fall into the feeding disc (11) and then enter the stationary main body (6) and the rotating part (8) of the feeding mechanism through the material receiving assembly. Under the action of the auxiliary heating device around the outside of the rotating part (8), the disc-shaped materials continuously flow out from the through-hole at the bottom of the rotating part (8) and are uniformly thermoplastified; During additive manufacturing, the distance between the lower end face of the rotating part (8) and the surface to be additively manufactured is adjusted so that when the additive is extruded from the lower end face of the rotating part (8), it can contact the surface to be additively manufactured, and the extruded material of friction stir extrusion and the surface to be additively manufactured are stirred, so that the extruded material forms a joint part with the surface to be additively manufactured in a non-molten state. Among them, the surface to be additively manufactured is the substrate surface and / or the surface of the joint part. After the additive material contacts the surface to be additively manufactured, it is friction stir heated and fully plastified between the lower end face of the stirrer and the surface to be additively manufactured. The process temperature is 60% - 90% of the melting point of the material, and an interatomic bonding layer is formed with the surface to be additively manufactured in a non-molten state, thereby forming a joint part. At the same time, the rotating part (8) of the additive manufacturing equipment moves parallel along a preset track to complete the single-layer additive manufacturing process.

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