A wire powder isomeric electromagnetic jet additive manufacturing device and method

Abstract

The application discloses a kind of silk powder isomeric electromagnetic jet additive manufacturing device and method, belong to material surface jet technical field.It includes shell and stirring needle, the lower end of stirring needle is provided with powder outlet and the gas powder passage compatible with the powder outlet, further include: fixedly installed in the needle sleeve of shell, the lower end of needle sleeve penetrates out of shell and is equipped with first spinneret;Fixedly installed in the guide wire shaft of shell, the lower end of guide wire shaft penetrates out of shell and is equipped with second spinneret;Fixedly installed on the yarn feeding assembly of shell, two metal wires in yarn feeding assembly are respectively connected with the positive and negative poles of power supply.Two metal wires are used as self-consumption electrode, when two metal wires penetrate out of shell and contact each other, short circuit is generated, due to high current density, electric arc is generated between two metal wires, the end of two metal wires is simultaneously melted, the particle generated by melting is wrapped on metal powder to form core-shell structure material, promote metal powder and substrate material to form more firm combination.

Description

Technical Field

[0001] This invention relates to the field of material surface spraying technology, and in particular to a wire powder heterogeneous electromagnetic spraying additive manufacturing apparatus and method. Background Technology

[0002] Surface spraying is a technology for strengthening and protecting the surface of workpieces. Currently, commonly used surface spraying techniques are mainly divided into thermal spraying and cold spraying. Thermal spraying involves melting the spray material with thermal energy, then atomizing it with a high-speed airflow. Driven by the high-speed airflow, the particles impact the substrate surface, and after condensation, form a coating with a specific function. Cold spraying is a spraying technology based on aerodynamic principles. It uses a high-pressure airflow to accelerate solid particles. At a relatively low temperature, when the particle velocity exceeds a certain critical value, the particles collide with the substrate at high speed, causing severe plastic deformation and forming a mechanical bond with the substrate. Surface spraying typically produces surface coatings with thicknesses ranging from tens of micrometers to several millimeters. Therefore, surface spraying technology is widely used in aerospace, automotive, sports, and machinery manufacturing industries.

[0003] However, regardless of whether it is thermal spraying or cold spraying, after the metal coating is sprayed onto the substrate surface to form a coating, countless deformable particles are stacked together in a wave-like pattern, which easily creates pores or voids inside, resulting in poor adhesion between the metal coating and the substrate surface. Summary of the Invention

[0004] The purpose of this invention is to solve the problem in the prior art that after metal coating is sprayed onto the substrate surface to form a coating, countless deformable particles are stacked together in a wave-like pattern, which easily generates pores or voids inside, resulting in poor bonding performance between the metal coating and the substrate surface. Therefore, a wire powder heterogeneous electromagnetic spraying additive manufacturing device and method are proposed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A filament-powder heterogeneous electromagnetic jet additive manufacturing apparatus includes a housing and a stirring needle. The lower end of the stirring needle is provided with a powder outlet and a gas-powder channel adapted to the powder outlet. The apparatus also includes: a needle sleeve fixedly installed inside the housing, the lower end of which extends through the housing and has a first filament nozzle; a guide shaft fixedly installed inside the housing, the lower end of which extends through the housing and has a second filament nozzle; and a filament feeding assembly fixedly installed on the housing. Two metal wires provided in the filament feeding assembly are respectively connected to the positive and negative terminals of a power source. The ends of the two metal wires away from the power source extend through the housing and enter the needle sleeve and the guide shaft, respectively.

[0007] In order to output metal powder, preferably, the stirring needle is rotatably mounted in the needle sleeve through a sealed bearing; a driven gear is fixedly mounted on the stirring needle, a drive motor is fixedly mounted on the needle sleeve, a drive gear is fixedly mounted on the output end of the drive motor, and the drive gear is meshed with the driven gear.

[0008] For outputting the metal wire, preferably, the wire feeding assembly includes: a U-shaped support fixedly mounted on the housing, a connecting shaft rotatably mounted inside the opening of the U-shaped support, a wire spool fixedly mounted on the connecting shaft, and the metal wire wound on the wire spool; a reduction motor fixedly mounted on the housing, a notched gear fixedly mounted at the output end of the reduction motor, and a connecting gear meshing with the notched gear fixedly mounted on the connecting shaft.

[0009] To bring two metal wires of different polarities close together and generate an electric arc, preferably, the device further includes: a guide nozzle slidably mounted inside the needle sleeve and the guide shaft, wherein a spring is fixedly connected between the guide nozzle and the inner wall of the needle sleeve and the guide shaft.

[0010] For heating metal powder, preferably, it further includes: a second mounting base fixedly installed inside the housing, a heating coil fixedly installed inside the second mounting base, an AC power supply box fixedly installed on the housing, and the heating coil connected to the AC power supply box via wires.

[0011] To cut the metal wire, preferably, the device further includes: a fly plate that is slidably mounted on the needle sleeve and the guide wire shaft, a wire-cutting blade that is fixedly mounted on the fly plate, a wedge block that is fixedly mounted on the wire-cutting blade, the wedge block that contacts the guide wire nozzle, and a drive assembly that pushes the fly plate to slide at high speed that is fixedly mounted inside the housing.

[0012] To drive the flyboard to impact the base plate, the drive assembly further comprises: a plurality of metal rods slidably mounted in the housing, the lower ends of the plurality of metal rods extending through the housing and fixedly connected to the flyboard, electromagnetic coils being sleeved on the plurality of metal rods, a first mounting base being fixedly mounted inside the housing, and limiting sleeves being equidistantly mounted on the first mounting base along the circumference, with metal wires connecting adjacent electromagnetic coils being fixed inside the limiting sleeves.

[0013] In order to atomize the metal wire into microparticles by compressed air and spray them onto the metal powder to form a core-shell structure, the device further includes a connecting plate fixedly installed on the upper end of the metal rod. An air bladder is fixedly installed between the connecting plate and the shell. A bellows is fixedly installed inside the air bladder. The lower end of the bellows extends through the shell and is installed inside the metal rod. An air nozzle connected to the bellows is fixedly installed at the lower end of the metal rod.

[0014] In order to repeatedly pull the fly plate so that it continuously impacts the substrate, thereby forming a metallurgical bond between the high-temperature core-shell structure particles and the substrate surface, the system further includes a top plate fixedly mounted on the stirring needle, with multiple wedge plates fixedly mounted below the top plate; a groove is provided in the second mounting base, and a connecting rod is elastically connected in the groove, with both ends of the connecting rod contacting the wedge plates and the connecting plates respectively.

[0015] A method for electromagnetic jet additive manufacturing of heterogeneous filament powder, comprising the following steps:

[0016] Step 1: The wire and metal powder are fed from the outlet to the substrate;

[0017] Step 2: The wire undergoes an electrical explosion to form a core-shell structure with the metal powder;

[0018] Step 3: The high-speed impact of the flying plate drives the metallurgical bonding between the core-shell structure material and the substrate;

[0019] Step 4: The stirring needle undergoes stirring and frictional motion, resulting in large plastic deformation.

[0020] Compared with the prior art, the present invention provides a wire powder heterogeneous electromagnetic jet additive manufacturing apparatus and method, which has the following beneficial effects:

[0021] 1. In this filament-powder heterogeneous electromagnetic jet additive manufacturing device, during jetting, two metal wires serve as consumable electrodes and are connected to the positive and negative terminals of a DC power supply, respectively. When the two metal wires pass through the shell and come into contact with each other, a short circuit is generated. At the instant of the short circuit, due to the high current density, an electric arc is generated between the two metal wires, which melts the ends of the two metal wires simultaneously. The particles generated by melting are wrapped around the metal powder to form a core-shell structure material, which promotes a stronger bond between the metal powder and the substrate material, thereby improving the mechanical properties of the coating.

[0022] 2. In this filament powder heterogeneous electromagnetic jet additive manufacturing device, because the electromagnetic coil is constantly energized, the metal rod remains stationary after being drawn into the electromagnetic coil. During the rotation cycle of the stirring needle, the wedge-shaped plate on the lower surface of the top plate abuts against the connecting rod. Due to the inclined lower surface of the wedge-shaped plate, the connecting rod pushes the metal rod away from the center position of the electromagnetic coil. When the wedge-shaped plate leaves the connecting rod, the metal rod is drawn back into the electromagnetic coil, forming a reciprocating motion. This causes the flying plate to continuously impact the substrate at high speed, forming a metallurgical bond between the core-shell structure material and the substrate. Simultaneously, as the drive motor continues to operate, the end of the stirring needle undergoes stirring and frictional motion on the jetted material, generating large plastic deformation. This further compacts the loose pores between the metal powder and the substrate, forming a denser coating.

[0023] 3. In this heterogeneous electromagnetic jet additive manufacturing device for wire powder, when the flyboard continuously impacts the substrate at high speed, the wedge block on the flyboard contacts the wire guide nozzle, the wedge block pushes the wire guide nozzle to retract, and the wire cutting blade on the flyboard cuts the metal wire, thus protecting the wire guide nozzle. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a wire powder heterogeneous electromagnetic jet additive manufacturing device proposed in this invention;

[0025] Figure 2 This is a second-view structural schematic diagram of a wire powder heterogeneous electromagnetic jet additive manufacturing device proposed in this invention.

[0026] Figure 3 This is a cross-sectional view of the stirring needle in a silk powder heterogeneous electromagnetic jet additive manufacturing device proposed in this invention.

[0027] Figure 4 This is a schematic diagram of the internal structure of the guide shaft of a wire powder heterogeneous electromagnetic jet additive manufacturing device proposed in this invention;

[0028] Figure 5 This invention proposes a wire powder heterogeneous electromagnetic jet additive manufacturing apparatus. Figure 1 A schematic diagram of the structure of part A;

[0029] Figure 6 This invention proposes a wire powder heterogeneous electromagnetic jet additive manufacturing apparatus. Figure 2 A structural diagram of section B;

[0030] Figure 7 This invention proposes a wire powder heterogeneous electromagnetic jet additive manufacturing apparatus. Figure 2 A structural diagram of section C;

[0031] Figure 8 This invention proposes a wire powder heterogeneous electromagnetic jet additive manufacturing apparatus. Figure 2 A schematic diagram of the structure of part D.

[0032] In the diagram: 1. Shell; 2. Stirring needle; 201. Powder outlet; 3. Needle sleeve; 301. First spinneret; 4. Guide shaft; 401. Second spinneret; 5. Flying plate; 6. Metal wire; 7. U-shaped support; 8. Connecting shaft; 9. Wire spool; 10. Gearbox; 11. Notched gear; 12. Connecting gear; 13. Air-powder channel; 14. Driven gear; 15. Drive motor; 16. Drive gear; 17. Metal rod; 18. Electromagnetic coil; 19. First mounting base; 1901. Limiting sleeve; 20. Connecting plate; 21. Airbag; 22. Bellows; 23. Air nozzle; 24. Second mounting base; 2401. Groove; 25. Heating coil; 26. AC power supply box; 27. Cutting blade; 28. Wedge plate; 29. ​​Connecting rod; 30. Guide nozzle; 31. Wedge block; 32. Top plate; 33. Spring. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0034] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] Example 1:

[0036] Reference Figures 1-8 A heterogeneous electromagnetic jet additive manufacturing device for filament powder includes a housing 1 and a stirring needle 2. The lower end of the stirring needle 2 is provided with a powder outlet 201 and a gas-powder channel 13 adapted to the powder outlet 201. The upper end of the gas-powder channel 13 passes through the housing 1 and is connected to a paint tank containing metal powder. The device also includes: a needle sleeve 3 fixedly installed in the housing 1. The needle sleeve 3 is a cylindrical hollow shell structure. The lower end of the needle sleeve 3 passes through the housing 1 and has a first filament nozzle 301. Two guide shafts 4 are fixedly installed in the housing 1 and are symmetrically installed on both sides of the needle sleeve 3, so that the entire device is a left-right symmetrical structure. The lower end of the guide shaft 4 passes through the housing 1 and has a second spinneret 401. The first spinneret 301 and the second spinneret 401 are located on the same horizontal plane. The wire feeding assembly is fixedly installed on the housing 1. The two metal wires 6 provided in the wire feeding assembly are respectively connected to the positive and negative terminals of the power supply. The ends of the two metal wires 6 away from the power supply pass through the housing 1 and enter the needle sleeve 3 and the guide shaft 4 respectively.

[0037] The powder outlet 201 is located below the first spinneret 301 and the second spinneret 401.

[0038] During spraying, two metal wires 6 serve as consumable electrodes and are connected to the positive and negative terminals of a DC power supply, respectively. When the two metal wires 6 penetrate through the housing 1 and come into contact with each other, a short circuit is generated. At the instant of the short circuit, due to the high current density, an electric arc is generated between the two metal wires 6, which melts the ends of the two metal wires 6 simultaneously. The particles generated by the melting wrap around the metal powder to form a core-shell structure material, which promotes a stronger bond between the metal powder and the substrate material, thereby improving the mechanical properties of the coating.

[0039] See Figure 1 and Figure 2 and Figure 5 The wire feeding assembly in this solution has been further optimized.

[0040] The wire feeding assembly includes: a U-shaped support 7 fixedly mounted on the housing 1, a connecting shaft 8 rotatably mounted inside the opening of the U-shaped support 7, a wire spool 9 fixedly mounted on the connecting shaft 8, and a metal wire 6 wound on the wire spool 9; a reduction motor 10 fixedly mounted on the housing 1, a notched gear 11 fixedly mounted at the output end of the reduction motor 10, and a connecting gear 12 meshing with the notched gear 11 fixedly mounted on the connecting shaft 8.

[0041] During the operation of the geared motor 10, the output end of the geared motor 10 drives the notched gear 11 to rotate. The rotating notched gear 11 intermittently drives the connecting gear 12 to rotate. The rotating connecting gear 12 drives the coaxial wire disc 9 to rotate, causing the wire disc 9 to feed wire intermittently.

[0042] See Figure 1 and Figure 2 and Figure 6 Furthermore, the stirring needle 2 is rotatably mounted inside the needle sleeve 3 via a sealed bearing; a driven gear 14 is fixedly mounted on the stirring needle 2, and a drive motor 15 is fixedly mounted on the needle sleeve 3. A drive gear 16 is fixedly mounted on the output end of the drive motor 15, and the drive gear 16 meshes with the driven gear 14.

[0043] During the operation of the drive motor 15, the output end of the drive motor 15 drives the drive gear 16 to rotate. The rotating drive gear 16 drives the meshing driven gear 14 to rotate. The rotating driven gear 14 drives the stirring needle 2 to rotate inside the needle sleeve 3. The centrifugal force generated by the rotation throws the metal powder in the air-powder channel 13 out.

[0044] In summary, during the spraying of the substrate, the output of the reduction motor 10 drives the notched gear 11 to rotate. The rotating notched gear 11 intermittently drives the connecting gear 12 to rotate, and the rotating connecting gear 12 drives the coaxial wire spool 9 to rotate, causing the wire spool 9 to feed wire intermittently. The output of the drive motor 15 drives the drive gear 16 to rotate, and the rotating drive gear 16 drives the meshing driven gear 14 to rotate. The rotating driven gear 14 drives the stirring needle 2 to rotate inside the needle sleeve 3. The centrifugal force generated by the rotation throws the metal powder in the air-powder channel 13 out. At this time, the two metal wires 6 act as consumable electrodes and are connected to the positive and negative terminals of the DC power supply, respectively. When the two metal wires 6 penetrate through the shell 1 and come into contact with each other, a short circuit is generated. At the moment of the short circuit, due to the high current density, an electric arc is generated between the two metal wires 6, which melts the ends of the two metal wires 6 simultaneously. The particles generated by the melting wrap around the metal powder to form a core-shell structure material, which promotes a stronger bond between the metal powder and the substrate material, thereby improving the mechanical properties of the coating.

[0045] Furthermore, after the process is completed, as the drive motor 15 continues to work, the end of the stirring needle 2 undergoes a stirring and frictional motion on the sprayed material, generating large plastic deformation. This causes the loose pores between the metal powder and the substrate to be further crushed, forming a denser coating.

[0046] Example 2:

[0047] See Figures 1-8 The solution is basically the same as in Example 1, but the entire technical solution has been further optimized based on Example 1.

[0048] To bring the two metal wires 6 of different polarities close together, an electric arc is generated. (See also...) Figure 1 and Figure 2 and Figure 4 The silk powder heterogeneous electromagnetic jet additive manufacturing device in this embodiment further includes: a guide nozzle 30 slidably installed inside the needle sleeve 3 and the guide shaft 4, and a spring 33 is fixedly connected between the guide nozzle 30 and the inner wall of the needle sleeve 3 and the guide shaft 4.

[0049] The output ends of the two guide nozzles 30 are brought close to each other, so that the metal wire 6 naturally bends to the other side after passing through the guide nozzles 30, which makes it easier for the two metal wires 6 of different polarities to come close to each other and generate an electric arc.

[0050] Example 3:

[0051] See Figures 1-8 The solution is basically the same as in Example 2, but the entire technical solution has been further optimized based on Example 2.

[0052] To heat the metal powder, the temperature difference between the metal powder and the molten metal wire 6 is reduced. (See also...) Figure 1 and Figure 2 and Figure 3 The filament powder heterogeneous electromagnetic jet additive manufacturing apparatus in this embodiment further includes: a second mounting base 24 fixedly installed inside the housing 1, a heating coil 25 fixedly installed inside the second mounting base 24, an AC power supply box 26 fixedly installed on the housing 1, and the heating coil 25 connected to the AC power supply box 26 through a wire.

[0053] When the high-frequency AC power in the AC power box 26 passes through the heating coil 25, it generates an alternating magnetic field around the heating coil 25. Since the gas-powder channel 13 located in the stirring needle 2 is a metal conductor, the magnetic field passes through the gas-powder channel 13 in the heating coil 25 to generate an induced current and form eddy currents. When the eddy currents flow on the surface of the gas-powder channel 13, the gas-powder channel 13 heats up. When the metal powder passes through the gas-powder channel 13, it is heated up.

[0054] Example 4:

[0055] See Figures 1-8 The solution is basically the same as in Example 3, but the entire technical solution has been further optimized based on Example 3.

[0056] To cut wire 6, see [link / reference]. Figure 1 and Figure 2 and Figure 4 The heterogeneous electromagnetic jet additive manufacturing apparatus for filament powder in this embodiment further includes: a flying plate 5 that is slidably mounted on the needle sleeve 3 and the guide shaft 4, a filament cutting blade 27 that is fixedly mounted inside the flying plate 5, a wedge block 31 that is fixedly mounted on the filament cutting blade 27, the wedge block 31 that is in contact with the guide nozzle 30, and a drive assembly that pushes the flying plate 5 to slide at high speed that is fixedly mounted inside the housing 1.

[0057] Under the action of the drive assembly, the fly plate 5 slides quickly on the needle sleeve 3. When the wedge block 31 inside the fly plate 5 contacts the guide nozzle 30, the wedge block 31 pushes the guide nozzle 30 to retract due to the sliding installation method of the guide nozzle 30. The wire cutting blade 27 on the fly plate 5 cuts the metal wire 6, and then the guide nozzle 30 is pushed back to its original position by the internal spring 33.

[0058] See Figure 1 and Figure 2 and Figure 7 and Figure 8 The driver components in this solution have been further optimized.

[0059] The drive assembly includes: a plurality of metal rods 17 slidably mounted inside the housing 1, the number of metal rods 17 being four and arranged in a circle. The lower ends of the plurality of metal rods 17 extend through the housing 1 and are fixedly connected to the fly plate 5. Electromagnetic coils 18 are sleeved on the plurality of metal rods 17. A first mounting base 19 is fixedly mounted inside the housing 1. Limiting sleeves 1901 are equidistantly mounted on the first mounting base 19 along the circumference. The metal wires connecting adjacent electromagnetic coils 18 are fixed inside the limiting sleeves 1901.

[0060] Since the magnetic field density is greatest at the center of the electromagnetic coil 18, the center of the electromagnetic coil 18 is the position with the strongest magnetic force. When the electromagnetic coil 18 is energized, the internal metal rod 17 will oscillate back and forth within the electromagnetic coil 18 for several cycles before being attracted to the center of the electromagnetic coil 18. Therefore, during the oscillation cycle and the process of being attracted into the electromagnetic coil 18, the flying plate 5 can quickly impact the substrate, causing the core-shell structure material to form a metallurgical bond with the substrate.

[0061] See Figure 8 Furthermore, it also includes a connecting plate 20 fixedly installed on the upper end of the metal rod 17. An airbag 21 is fixedly installed between the connecting plate 20 and the housing 1. A bellows 22 is fixedly installed inside the airbag 21. The lower end of the bellows 22 passes through the housing 1 and is installed inside the metal rod 17. An air nozzle 23 connected to the bellows 22 is fixedly installed at the lower end of the metal rod 17.

[0062] During the oscillation cycle of the metal rod 17, the airbag 21 is compressed by force, and compressed air is ejected from the air nozzle 23 at the lower end of the metal rod 17, causing the particles generated by the melting of the metal wire 6 to be wrapped around the metal powder to form a core-shell structure material.

[0063] See Figure 1 and Figure 2 Furthermore, it also includes a top plate 32 fixedly mounted on the stirring needle 2, with multiple wedge plates 28 fixedly mounted below the top plate 32; there are four wedge plates 28 arranged in a circle, and a groove 2401 is formed in the second mounting base 24. Connecting rods 29 are elastically connected within the groove 2401, with four connecting rods 29 corresponding to the positions of the metal rods 17. Tension springs are fitted onto the connecting rods 29, and the two ends of the tension springs are fixedly connected to the bottom surface of the groove 2401 and the upper end of the connecting rod 29, respectively. The two ends of the connecting rods 29 are in contact with the wedge plates 28 and the connecting plate 20, respectively.

[0064] Since the electromagnetic coil 18 is always energized, the metal rod 17 does not change after being drawn into the electromagnetic coil 18. During the rotation cycle of the stirring needle 2, the wedge plate 28 on the lower surface of the top plate 32 abuts against the connecting rod 29. Since the lower surface of the wedge plate 28 is in an inclined state, the connecting rod 29 pushes the metal rod 17 away from the center position of the electromagnetic coil 18. When the wedge plate 28 leaves the connecting rod 29, the metal rod 17 will be drawn back into the electromagnetic coil 18, forming a reciprocating motion, causing the flying plate 5 to continuously hit the substrate at high speed.

[0065] A method for electromagnetic jet additive manufacturing of heterogeneous filament powder, comprising the following steps:

[0066] Step 1: The output end of the geared motor 10 drives the notched gear 11 to rotate. The rotating notched gear 11 intermittently drives the connecting gear 12 to rotate. The rotating connecting gear 12 drives the coaxial wire disc 9 to rotate, so that the wire disc 9 feeds wire intermittently.

[0067] Step 2: The output end of the drive motor 15 drives the drive gear 16 to rotate. The rotating drive gear 16 drives the meshing driven gear 14 to rotate. The rotating driven gear 14 drives the stirring needle 2 to rotate inside the needle sleeve 3. The centrifugal force generated by the rotation throws out the metal powder in the air-powder channel 13.

[0068] Step 3: Two metal wires 6 serve as consumable electrodes and are connected to the positive and negative terminals of a DC power supply, respectively. When the two metal wires 6 pass through the housing 1 and come into contact with each other, a short circuit is generated. At the instant of the short circuit, due to the high current density, an electric arc is generated between the two metal wires 6, which melts the ends of the two metal wires 6 simultaneously. The particles generated by the melting are wrapped around the metal powder to form a core-shell structure material, which promotes a stronger bond between the metal powder and the substrate material, thereby improving the mechanical properties of the coating.

[0069] Step 4: Since the magnetic field density is the highest at the center of the electromagnetic coil 18, the center of the electromagnetic coil 18 is the position with the strongest magnetic force. When the electromagnetic coil 18 is energized, the internal metal rod 17 will oscillate back and forth in the electromagnetic coil 18 for several cycles and then be attracted to the center of the electromagnetic coil 18. Therefore, during the oscillation cycle and the process of being attracted into the electromagnetic coil 18, the flying plate 5 can quickly hit the substrate, so that the core-shell structure material forms a metallurgical bond with the substrate.

[0070] Step 5: Since the electromagnetic coil 18 is always energized, the metal rod 17 does not change after being drawn into the electromagnetic coil 18. During the rotation cycle of the stirring needle 2, the wedge plate 28 on the lower surface of the top plate 32 abuts against the connecting rod 29. Since the lower surface of the wedge plate 28 is inclined, the connecting rod 29 pushes the metal rod 17 away from the center position of the electromagnetic coil 18. When the wedge plate 28 leaves the connecting rod 29, the metal rod 17 will be drawn back into the electromagnetic coil 18, forming a reciprocating motion, causing the flying plate 5 to continuously hit the substrate at high speed.

[0071] Step 6: As the drive motor 15 continues to work, the end of the stirring needle 2 undergoes stirring and frictional motion on the sprayed material, generating large plastic deformation, which further crushes the loose pores between the metal powder and the substrate, forming a denser coating.

[0072] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A filament powder heterogeneous electromagnetic jet additive manufacturing apparatus, comprising a housing (1) and a stirring needle (2), wherein the lower end of the stirring needle (2) is provided with a powder outlet (201) and an air-powder channel (13) adapted to the powder outlet (201), characterized in that, Also includes: A needle sleeve (3) is fixedly installed inside the housing (1), the lower end of the needle sleeve (3) extends through the housing (1) and has a first spinneret (301); A guide wire shaft (4) is fixedly installed inside the housing (1), and the lower end of the guide wire shaft (4) extends through the housing (1) and is provided with a second spinneret (401); A wire feeding assembly is fixedly installed on the housing (1). The two metal wires (6) provided in the wire feeding assembly are respectively connected to the positive and negative poles of the power supply. The ends of the two metal wires (6) away from the power supply pass through the housing (1) and enter the needle sleeve (3) and the guide shaft (4) respectively. The stirring needle (2) is rotatably mounted in the needle sleeve (3) via a sealed bearing; A driven gear (14) is fixedly installed on the stirring needle (2), a drive motor (15) is fixedly installed on the needle sleeve (3), a drive gear (16) is fixedly installed at the output end of the drive motor (15), and the drive gear (16) meshes with the driven gear (14). The wire feeding assembly includes: a U-shaped support seat (7) fixedly installed on the housing (1), a connecting shaft (8) rotatably installed in the opening of the U-shaped support seat (7), a wire spool (9) fixedly installed on the connecting shaft (8), and the metal wire (6) wound on the wire spool (9); A geared motor (10) is fixedly installed on the housing (1). A notched gear (11) is fixedly installed at the output end of the geared motor (10). A connecting gear (12) that meshes with the notched gear (11) is fixedly installed on the connecting shaft (8). It also includes: a guide wire nozzle (30) that is slidably installed in the needle sleeve (3) and the guide wire shaft (4), wherein the guide wire nozzle (30) is fixedly connected to the inner wall of the needle sleeve (3) and the guide wire shaft (4) by a spring (33); It also includes: a second mounting base (24) fixedly installed inside the housing (1), a heating coil (25) fixedly installed inside the second mounting base (24), an AC power box (26) fixedly installed on the housing (1), and the heating coil (25) connected to the AC power box (26) through a wire; It also includes: a flying plate (5) that is slidably mounted on the needle sleeve (3) and the guide wire shaft (4), a wire cutting blade (27) is fixedly mounted inside the flying plate (5), a wedge block (31) is fixedly mounted on the wire cutting blade (27), the wedge block (31) is in contact with the guide wire nozzle (30), and a drive assembly for pushing the flying plate (5) to slide at high speed is fixedly mounted inside the housing (1); The drive assembly includes: a plurality of metal rods (17) slidably installed in the housing (1), the lower ends of the plurality of metal rods (17) passing through the housing (1) and fixedly connected to the flyboard (5), electromagnetic coils (18) being sleeved on the plurality of metal rods (17), a first mounting seat (19) being fixedly installed in the housing (1), and limit sleeves (1901) being installed equidistantly along the circumference on the first mounting seat (19), and metal wires connecting adjacent electromagnetic coils (18) being fixed in the limit sleeves (1901).

2. The electromagnetic jet additive manufacturing apparatus for heterogeneous wire powder according to claim 1, characterized in that, It also includes a connecting plate (20) fixedly installed on the upper end of the metal rod (17), an airbag (21) fixedly installed between the connecting plate (20) and the housing (1), a bellows (22) fixedly installed inside the airbag (21), the lower end of the bellows (22) penetrating out of the housing (1) and installed inside the metal rod (17), and an air nozzle (23) connected to the bellows (22) fixedly installed at the lower end of the metal rod (17).

3. The electromagnetic jet additive manufacturing apparatus for heterogeneous silk powder according to claim 2, characterized in that, It also includes a top plate (32) fixedly installed on the stirring needle (2), and a plurality of wedge plates (28) are fixedly installed below the top plate (32); The second mounting base (24) has a groove (2401) inside, and a connecting rod (29) is elastically connected inside the groove (2401). The two ends of the connecting rod (29) are in contact with the wedge plate (28) and the connecting plate (20) respectively.

4. A method for heterogeneous electromagnetic jet additive manufacturing of filament powder, employing the filament powder heterogeneous electromagnetic jet additive manufacturing apparatus according to any one of claims 1-3, characterized in that, The operation steps are as follows: Step 1: The wire and metal powder are fed from the outlet to the substrate; Step 2: The wire undergoes an electrical explosion to form a core-shell structure with the metal powder; Step 3: The high-speed impact of the flying plate (5) drives the metallurgical bonding between the core-shell structure material and the substrate; Step 4: The stirring needle (2) performs stirring and frictional motion to produce large plastic deformation.

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