A powder-fed electromagnetic injection additive manufacturing apparatus and method

Abstract

The application discloses a powder feeding type electromagnetic injection additive manufacturing device and method and belongs to the technical field of material surface injection processing. The powder feeding type electromagnetic injection additive manufacturing device comprises a shell, an alternating current power supply box is fixedly installed on the shell, and the powder feeding type electromagnetic injection additive manufacturing device further comprises: a stirring needle rotatably installed in the shell, a gas-powder output port is formed in the periphery of one end of the stirring needle located outside the shell, a gas-powder mixing input pipe is fixedly installed at the other end of the stirring needle, and a metal channel is fixedly installed in the stirring needle; a motor is fixedly installed in the shell, a driving gear is fixedly installed at the output end of the motor, and a gear ring matched with the driving gear is fixedly installed on the outer edge surface of the stirring needle; a flying plate is elastically installed on the shell, a metal rod is fixedly installed on the flying plate, the upper end of the metal rod is in contact with the gear ring, an accelerating element for driving the metal rod is fixedly installed in the shell, and the flying plate is high-speed impacted on the metal powder under the action of the accelerating element, so that the high-temperature metal powder is metallurgically combined with the substrate.

Description

Technical Field

[0001] This invention relates to the field of material surface spraying technology, and in particular to a powder-feeding 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, during the cold spraying process, the presence of pores within the coating can degrade its corrosion resistance and reduce its bonding strength, thereby worsening its mechanical properties. Summary of the Invention

[0004] The purpose of this invention is to solve the problem that the existing cold coating has pores, which will degrade the anti-corrosion performance of the coating and reduce the bonding strength of the coating, thereby deteriorating its mechanical properties. The invention proposes a powder feeding electromagnetic jet additive manufacturing device and method.

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

[0006] A powder-feeding electromagnetic jet additive manufacturing device includes a housing, on which an AC power supply box is fixedly installed. It also includes: a stirring needle rotatably installed inside the housing, with a gas-powder output port circumferentially formed at one end of the stirring needle outside the housing, and a gas-powder mixing input pipe fixedly installed at the other end of the stirring needle; a metal channel fixedly installed inside the stirring needle; a motor fixedly installed inside the housing, with a drive gear fixedly installed at the output end of the motor; a gear ring fixedly installed on the outer edge of the stirring needle to cooperate with the drive gear; and a fly plate elastically installed on the housing, with a metal rod fixedly installed on the fly plate, the upper end of which contacts the gear ring; and an acceleration component for driving the metal rod fixedly installed inside the housing.

[0007] In order to reciprocate the flying plate and cause it to strike the substrate, thereby forming a metallurgical bond between the high-temperature metal powder and the substrate surface, preferably, a first wedge block is integrally formed on the lower surface of the toothed ring, the lower part of the first wedge block is bent outward with an eave, and the upper end of the metal rod is provided with an inclined groove that matches the eave.

[0008] To further increase the impact speed of the flyboard, the acceleration component includes: a conduit fixedly installed inside the housing, with a first induction coil wound around it, the positive and negative poles of the first induction coil passing through the housing and connected to an external power source; a bearing seat fixedly installed inside the housing, with the stirring needle rotatably installed inside the bearing seat, and a wire sleeve fixedly installed on the outer edge of the bearing seat.

[0009] In order to generate large plastic deformation by stirring and friction on the substrate surface and form a dense coating, preferably, it further includes: a fixing ring fixedly installed in the housing, two annular rails symmetrically installed on the fixing ring, a limiting boss fixedly installed on the outer edge surface of the stirring needle, a limiting rod fixedly installed in the limiting boss, and ball bearings rotatably installed at both ends of the limiting rod, the ball bearings sliding in cooperation within the annular rails.

[0010] To heat the metal powder inside the stirring needle, preferably, the device further includes: an insulating base fixedly installed inside the housing, a second induction coil coaxially disposed between the insulating base and the stirring needle, the output end of the second induction coil passing through the housing and connected to an AC power supply box, and the metal rod slidably installed inside the insulating base.

[0011] To reduce the residue of metal powder in the stirring needle, a sleeve is further included, which is fixedly installed on the stirring needle. A sliding rod is elastically connected inside the sleeve. The end of the sliding rod away from the sleeve passes through the stirring needle and is fixedly installed with a metal block. A sealing ring is fixedly installed on the outer edge of the metal block.

[0012] To further improve the flow rate of the metal powder, the metal block is provided with uniformly distributed flow grooves, and baffles are fixedly installed on the inner sidewalls of the flow grooves.

[0013] To further reduce the backflow of heated metal powder, a check plate is rotatably installed on the side of the flow channel near the metal channel.

[0014] To adjust the output flow rate of the metal powder, preferably, the method further includes: a rotating adjusting ring mounted on the stirring needle, an extension rod fixedly mounted on the inner wall of the adjusting ring, a second wedge block fixedly mounted on one end of the extension rod that passes through the stirring needle, and a linear rail fixedly mounted on the inner wall of the stirring needle on both sides of the gas-powder output port, with a baffle elastically connected inside the linear rail, the baffle abutting against the second wedge block.

[0015] A powder-feeding electromagnetic jet additive manufacturing method, the operation steps are as follows:

[0016] Step 1: Metal powder is output from the gas-powder output port on the stirring needle;

[0017] Step 2: Metal powder enters below the flyboard;

[0018] Step 3: Electromagnetic force drives the flying plate to impact the metal powder at high speed, causing the high-temperature metal powder to form a metallurgical bond with the substrate surface;

[0019] Step 4: Stirring: Stirring the substrate surface to generate large plastic deformation and form a dense coating.

[0020] Compared with the prior art, the present invention provides an aluminum electromagnetic injection device and injection method, which has the following beneficial effects:

[0021] 1. In this powder-feeding electromagnetic jet additive manufacturing device, when the powder is jetted onto the substrate surface, the output end of the motor drives the drive gear to rotate, the rotating drive gear drives the meshing gear ring to rotate, the rotating gear ring causes the stirring needle to rotate inside the housing, and the metal powder inside the stirring needle is thrown onto the substrate through the air-powder output port under the action of centrifugal force. The flying plate impacts the metal powder at high speed under the oscillation of the metal rod, so that the high-temperature metal powder forms a metallurgical bond with the substrate.

[0022] 2. In this powder-feeding electromagnetic jet additive manufacturing device, during the rotation of the motor-controlled drive gear, the stirring needle rotates with the gear ring. After the fly plate hits the metal powder, the end of the stirring needle undergoes a stirring and frictional motion on the jetted 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.

[0023] 3. In this powder-feeding electromagnetic jet additive manufacturing device, when the high-frequency AC current in the AC power supply box passes through the second induction coil, it generates an alternating magnetic field around the second induction coil. Since the metal channel inside the stirring needle is a conductor, the magnetic field passing through the metal channel in the second induction coil induces a current, forming eddy currents. When these eddy currents flow on the surface of the metal channel, they cause the metal channel to heat up. When the metal powder passes through the M-shaped metal channel, the circuitous path increases the heating time of the metal powder. Furthermore, the heating process of the metal powder is completed within the stirring needle, reducing the inhalation of high-temperature gases by workers. Attached Figure Description

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

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

[0026] Figure 3 This is a schematic diagram of the stirring needle structure of a powder-feeding electromagnetic jet additive manufacturing device proposed in this invention;

[0027] Figure 4 This is a partial structural diagram of the stirring needle in a powder-feeding electromagnetic jet additive manufacturing device proposed in this invention.

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

[0029] Figure 6 This invention proposes a powder-feeding electromagnetic jet additive manufacturing apparatus. Figure 1 A schematic diagram of the structure of part B.

[0030] In the diagram: 1. Shell; 2. Stirring needle; 201. Gas-powder output port; 202. Limiting boss; 203. Limiting rod; 204. Ball bearing; 205. Linear rail; 206. Hemispherical placement slot; 3. AC power box; 4. Gas-powder mixing input pipe; 5. Metal channel; 6. Motor; 7. Drive gear; 8. Gear ring; 801. First wedge block; 802. Edge; 9. Flying plate; 10. Metal rod; 1001. Inclined groove; 1 1. Conduit; 12. First induction coil; 13. Bearing housing; 1301. Wire sleeve; 14. Fixing ring; 15. Circular rail; 16. Insulating seat; 17. Second induction coil; 18. Sleeve; 19. Sliding rod; 20. Metal block; 2001. Flow groove; 2002. Baffle plate; 2003. Check plate; 21. Sealing ring; 22. Adjusting ring; 23. Extension rod; 24. Second wedge block; 25. Baffle plate; 26. Sphere. Detailed Implementation

[0031] 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.

[0032] 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. Example

[0033] Reference Figures 1-6A powder-feeding electromagnetic jet additive manufacturing device includes a housing 1, an AC power supply box 3 fixedly mounted on the housing 1, and further includes: a stirring needle 2 rotatably mounted inside the housing 1, one end of the stirring needle 2 located outside the housing 1 having a gas-powder output port 201 along its circumference, the gas-powder output port 201 protruding from the housing 1, the other end of the stirring needle 2 being fixedly mounted with a gas-powder mixing input pipe 4, a one-way valve being fixedly mounted inside the gas-powder mixing input pipe 4 to ensure that metal powder can only enter the stirring needle 2 through the gas-powder mixing input pipe 4 and cannot flow back out, a metal channel 5 being fixedly mounted inside the stirring needle 2; a motor 6 fixedly mounted inside the housing 1, a drive gear 7 being fixedly mounted at the output end of the motor 6, a toothed ring 8 that mates with the drive gear 7 being fixedly mounted on the outer edge of the stirring needle 2; a flyboard 9 elastically mounted on the housing 1, a metal rod 10 being fixedly mounted on the flyboard 9, the upper end of the metal rod 10 contacting the toothed ring 8, and an acceleration component for driving the metal rod 10 being fixedly mounted inside the housing 1.

[0034] See Figure 3 The metal channel 5 adopts an M-shaped structure, which increases the flow path of metal powder in the stirring needle 2.

[0035] When spraying onto the substrate surface, the output end of the motor 6 drives the drive gear 7 to rotate. The rotating drive gear 7 drives the meshing gear ring 8 to rotate. The rotating gear ring 8 causes the stirring needle 2 to rotate inside the housing 1. Under the action of centrifugal force, the metal powder inside the stirring needle 2 is thrown onto the substrate through the air-powder output port 201. The flying plate 9 impacts the metal powder at high speed under the action of the acceleration component, so that the high-temperature metal powder forms a metallurgical bond with the substrate.

[0036] See Figure 1 and Figure 2 and Figure 5 The acceleration components in this solution have been further optimized.

[0037] The accelerating component includes: a conduit 11 fixedly installed inside the housing 1, with a first induction coil 12 wound around the conduit 11, the positive and negative poles of the first induction coil 12 passing through the housing 1 and connected to an external power source; a bearing seat 13 fixedly installed inside the housing 1, with a stirring needle 2 rotatably installed inside the bearing seat 13, and a wire sleeve 1301 fixedly installed on the outer edge surface of the bearing seat 13.

[0038] Since the magnetic field density is greatest at the center of the electromagnetic coil, the center of the first induction coil 12 is the position with the strongest magnetic force. When the first induction coil 12 is energized, the internal metal rod 10 will oscillate back and forth within the first induction coil 12 for several cycles before being attracted to the center of the first induction coil 12. Therefore, during the oscillation cycle and the process of being attracted into the first induction coil 12, the flying plate 9 can quickly impact the metal powder, causing the high-temperature metal powder to form a metallurgical bond with the substrate.

[0039] See Figure 1 and Figure 2 and Figure 6 Furthermore, a first wedge block 801 is integrally formed on the lower surface of the toothed ring 8, and an eave 802 is bent outward from the lower direction of the first wedge block 801. An inclined groove 1001 that matches the eave 802 is opened at the upper end of the metal rod 10.

[0040] Since the first induction coil 12 is always energized, the metal rod 10 stops moving after being drawn into the first induction coil 12. During the rotation cycle of the toothed ring 8, the edge 802 on the first wedge block 801 on the lower surface of the toothed ring 8 is inserted into the inclined groove 1001 on the metal rod 10. Due to the constraint of the housing 1, the rotating first wedge block 801 pulls the metal rod 10 upward, away from the center position of the first induction coil 12. When the first wedge block 801 leaves the inclined groove 1001 on the metal rod 10, the metal rod 10 will be drawn into the first induction coil 12 again, forming a reciprocating motion, causing the flying plate 9 to continuously strike the metal powder at high speed.

[0041] A spring is fitted onto the metal rod 10, with the two ends of the spring acting on the bottom of the housing 1 and the upper surface of the fly plate 9. Example

[0042] See Figures 1-6 The solution is basically the same as in Example 1, but the entire technical solution has been further optimized based on Example 1.

[0043] In cold spraying technology, the presence of pores within the cold coating can degrade its corrosion resistance. (See also...) Figure 1 and Figure 2 and Figure 3 The electromagnetic injection device in this embodiment further includes: a fixed ring 14 fixedly installed in the housing 1, two annular rails 15 symmetrically installed on the fixed ring 14, a limiting boss 202 fixedly installed on the outer edge surface of the stirring needle 2, a limiting rod 203 fixedly installed in the limiting boss 202, and ball bearings 204 rotatably installed at both ends of the limiting rod 203, the ball bearings 204 sliding in the annular rail 15.

[0044] Two annular rails 15 constrain the position of the stirring needle 2 within the housing 1 and support and fix the stirring needle 2, reducing the random sliding of the stirring needle 2 within the housing 1. At the same time, the sliding of the ball bearings 204 improves the transmission efficiency of the motor 6.

[0045] During the rotation of the drive gear 7 controlled by the motor 6, the stirring needle 2 rotates with the toothed ring 8. After the fly plate 9 hits the metal powder, the end of the stirring needle 2 undergoes a stirring and frictional motion on the sprayed material, resulting in large plastic deformation. This causes the loose pores between the metal powder and the substrate to be further crushed, forming a denser coating. Example

[0046] See Figures 1-6 The solution is basically the same as in Example 2, but the entire technical solution has been further optimized based on Example 2.

[0047] Thermal spraying technology requires high temperatures. The gases and other harmful substances produced during the high-temperature process are detrimental to human health, and the production environment is harsh, with emissions contradicting national environmental protection policies. (See also...) Figure 1 and Figure 2 and Figure 3 The electromagnetic jet device in this embodiment further includes: an insulating seat 16 fixedly installed in the housing 1, a second induction coil 17 coaxially arranged between the insulating seat 16 and the stirring needle 2, the output end of the second induction coil 17 passing through the housing 1 and connected to the AC power box 3, and a metal rod 10 slidably installed in the insulating seat 16.

[0048] When the high-frequency AC power in the AC power box 3 passes through the second induction coil 17, it generates an alternating magnetic field around the second induction coil 17. Since the metal channel 5 located in the stirring needle 2 is a conductor, the magnetic field passes through the metal channel 5 in the second induction coil 17 to generate an induced current and form eddy currents. When the eddy currents flow on the surface of the metal channel 5, the metal channel 5 heats up. When the metal powder passes through the M-shaped metal channel 5, the tortuous channel increases the heating time of the metal powder.

[0049] The heating process of the metal powder is completed inside the stirring needle 2, which reduces the inhalation of high-temperature gases by the workers.

[0050] See Figure 3 Furthermore, it also includes a sleeve 18 fixedly installed on the stirring needle 2. A sliding rod 19 is elastically connected inside the sleeve 18. The end of the sliding rod 19 away from the sleeve 18 passes through the stirring needle 2 and is fixedly installed with a metal block 20. A sealing ring 21 is fixedly installed on the outer edge of the metal block 20.

[0051] During the upward movement of the rotating toothed ring 8 pulling the metal rod 10, the energized metal rod 10 also becomes magnetic. The metal block 20 is affected by the magnetism and moves towards the side of the gas-powder mixing input pipe 4. After a portion of the metal powder is input into the gas-powder mixing input pipe 4, the rising metal block 20 squeezes the metal powder between the metal block 20 and the metal channel 5, causing the metal powder to be heated.

[0052] It is then reset by the action of metal rod 10 and slide rod 19, forming a cycle.

[0053] Since the sealing ring 21 is always in close contact with the inner wall of the stirring pin 2, the metal powder residue on the inner wall of the stirring pin 2 is reduced as the metal block 20 slides back and forth.

[0054] See Figure 3 Furthermore, the metal block 20 is provided with uniformly distributed flow grooves 2001, and a baffle plate 2002 is fixedly installed on the inner side wall of the flow groove 2001.

[0055] During the resetting process of the metal block 20, when the metal powder passes through the flow groove 2001 on the metal block 20, the temperature in the flow groove 2001 can preheat the metal powder, and the baffle 2002 in the flow groove 2001 disrupts the flow trajectory of the metal powder, thereby improving the mixing effect of the metal powder.

[0056] See Figure 3 Furthermore, a check plate 2003 is rotatably installed on the side of the flow channel 2001 near the metal channel 5.

[0057] When new metal powder is input into the gas-powder mixing input pipe 4 to compress the metal block 20, the check plate 2003 is in the closed state, and the new metal powder will not mix with the heated metal powder. During the resetting process of the metal block 20, the check plate 2003 is in the open state, and the metal powder can enter the metal channel 5 through the flow groove 2001 for heating. Example

[0058] See Figures 1-6 The solution is basically the same as in Example 3, but the entire technical solution has been further optimized based on Example 3.

[0059] When spraying a small area of ​​substrate, a fixed flow rate can lead to waste of metal powder. (See also...) Figure 1 and Figure 2 and Figure 4 The electromagnetic injection device in this embodiment further includes: an adjusting ring 22 rotatably mounted on the stirring needle 2; an extension rod 23 fixedly mounted on the inner wall of the adjusting ring 22; a second wedge block 24 fixedly mounted on one end of the extension rod 23 that passes through the stirring needle 2; and a linear rail 205 fixedly mounted on the inner wall of the stirring needle 2 on both sides of the gas-powder output port 201. A baffle 25 is elastically connected inside the linear rail 205, and the baffle 25 abuts against the second wedge block 24.

[0060] By rotating the adjusting ring 22, the second wedge block 24 on the adjusting ring 22 presses down the baffle 25, and the baffle 25 covers part of the gas powder output port 201, thereby changing the output flow rate of the metal powder.

[0061] See Figure 4 A ball 26 is elastically installed on the inner wall of the adjusting ring 22, and a hemispherical placement groove 206 extends inward on the outer edge surface of the stirring needle 2. When the ball 26 is stuck in the hemispherical placement groove 206, the adjusting ring 22 can be fixed.

[0062] A powder-feeding electromagnetic jet additive manufacturing method, the operation steps are as follows:

[0063] Step 1: When the high-frequency AC power in the AC power box 3 passes through the second induction coil 17, it generates an alternating magnetic field around the second induction coil 17. Since the metal channel 5 located in the stirring needle 2 is a conductor, the magnetic field passes through the metal channel 5 in the second induction coil 17 to generate an induced current and form eddy currents. When the eddy currents flow on the surface of the metal channel 5, the metal channel 5 heats up.

[0064] Step 2: During the upward movement of the metal rod 10 pulled by the rotating toothed ring 8, the energized metal rod 10 also has magnetism. The metal block 20 is affected by the magnetism and moves towards the side of the gas-powder mixing input pipe 4. After some metal powder is input into the gas-powder mixing input pipe 4, the rising metal block 20 squeezes the metal powder between the metal block 20 and the metal channel 5, so that the metal powder is heated.

[0065] Step 3: The output end of the motor 6 drives the drive gear 7 to rotate. The rotating drive gear 7 drives the meshing gear ring 8 to rotate. The rotating gear ring 8 causes the stirring needle 2 to rotate inside the housing 1. The metal powder inside the stirring needle 2 is thrown onto the substrate through the gas powder output port 201 under the action of centrifugal force.

[0066] Step 4: When the first induction coil 12 is energized, the internal metal rod 10 will oscillate back and forth in the first induction coil 12 for several cycles and then be attracted to the center position of the first induction coil 12. Therefore, during the oscillation cycle and the process of being attracted into the first induction coil 12, the flying plate 9 can quickly impact the metal powder, so that the high temperature metal powder forms a metallurgical bond with the substrate.

[0067] Step 5: During the rotation cycle of the toothed ring 8, the edge 802 on the first wedge block 801 on the lower surface of the toothed ring 8 is inserted into the inclined groove 1001 on the metal rod 10. Due to the constraint of the housing 1, the rotating first wedge block 801 pulls the metal rod 10 upward and away from the center position of the first induction coil 12. When the first wedge block 801 leaves the inclined groove 1001 on the metal rod 10, the metal rod 10 will be sucked into the first induction coil 12 again, forming a reciprocating motion, so that the flying plate 9 continuously impacts the metal powder at high speed.

[0068] Step 6: The end of the stirring needle 2 undergoes a 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.

[0069] 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 powder-fed electromagnetic injection additive manufacturing device comprising a housing (1), an alternating current power supply box (3) is fixedly installed on the housing (1), characterized in that, Also include: The stirring needle (2) is rotatably installed in the shell (1), and the stirring needle (2) is provided with a gas powder output port (201) on the periphery of one end outside the shell (1), and the other end of the stirring needle (2) is fixedly installed with a gas powder mixing input pipe (4), and the stirring needle (2) is fixedly installed with a metal channel (5) inside; The motor (6) is fixedly installed in the shell (1), the output end of the motor (6) is fixedly installed with a driving gear (7), the outer edge surface of the stirring needle (2) is fixedly installed with a gear ring (8) matched with the driving gear (7), the lower surface of the gear ring (8) is integrally formed with a first wedge block (801), the lower surface of the first wedge block (801) is outwardly bent with an eave edge (802), the upper end of the metal rod (10) is provided with a inclined groove (1001) matched with the eave edge (802); The flying plate (9) is elastically installed on the shell (1), the metal rod (10) is fixedly installed on the flying plate (9), the upper end of the metal rod (10) is in contact with the gear ring (8), and the shell (1) is fixedly installed with an accelerating member for driving the metal rod (10).

2. The powder-fed electromagnetic jet additive manufacturing device of claim 1, wherein, The accelerating member comprises: The wire tube (11) is fixedly installed in the shell (1), the first induction coil (12) is wound on the wire tube (11), and the positive and negative electrodes of the first induction coil (12) penetrate out of the shell (1) and are connected with the power supply; The bearing seat (13) is fixedly installed in the shell (1), the stirring needle (2) is rotatably installed in the bearing seat (13), and the outer edge surface of the bearing seat (13) is fixedly installed with a wire sleeve (1301).

3. The powder-fed electromagnetic jet additive manufacturing device of claim 1, wherein, Also include: The fixed ring (14) is fixedly installed in the shell (1), two annular tracks (15) are symmetrically installed on the fixed ring (14), a circle of limiting bosses (202) is fixedly installed on the outer edge surface of the stirring needle (2), a limiting rod (203) is fixedly installed in the limiting boss (202), and rolling balls (204) are rotatably installed at both ends of the limiting rod (203). The rolling balls (204) are matched and slid in the annular track (15).

4. The powder-fed electromagnetic inkjet additive manufacturing device of claim 1, wherein, Also include: The insulating seat (16) is fixedly installed in the shell (1), the second induction coil (17) is coaxially arranged between the insulating seat (16) and the stirring needle (2), the output end of the second induction coil (17) penetrates the shell (1) and is connected with the alternating current power supply box (3); The metal rod (10) is slidably installed in the insulating seat (16).

5. A powder-fed electromagnetic inkjet additive manufacturing device according to claim 4, wherein, Also include a sleeve (18) fixedly installed on the stirring needle (2), a sliding rod (19) is elastically connected in the sleeve (18), one end of the sliding rod (19) away from the sleeve (18) penetrates the stirring needle (2) and is fixedly installed with a metal block (20), and a sealing ring (21) is fixedly installed on the outer edge surface of the metal block (20).

6. A powder-fed electromagnetic inkjet additive manufacturing device according to claim 5, wherein, The metal block (20) is uniformly provided with a flow channel (2001), and the inner side wall of the flow channel (2001) is fixedly installed with a spoiler (2002).

7. The powder-fed electromagnetic inkjet additive manufacturing device of claim 6, wherein, The flow channel (2001) is rotatably installed with a check plate (2003) on one side close to the metal channel (5).

8. The powder-fed electromagnetic inkjet additive manufacturing device of claim 1, wherein, Also include: The adjusting ring (22) is rotatably installed on the stirring needle (2), an extension rod (23) is fixedly installed on the inner wall of the adjusting ring (22), a second wedge block (24) is fixedly installed on one end of the extension rod (23) penetrating through the stirring needle (2), a linear rail (205) is fixedly installed on the inner wall on both sides of the gas powder output port (201) of the stirring needle (2), and an elastic connection is formed between the linear rail (205) and a baffle (25), and the baffle (25) is in abutment with the second wedge block (24).

9. A method of powder-fed electromagnetic jet additive manufacturing, using a powder-fed electromagnetic jet additive manufacturing device according to any one of claims 1 to 8, characterized in that The operation steps are as follows: Step 1: metal powder is output from the gas powder output port (201) on the stirring needle (2); Step 2: the metal powder enters below the fly plate (9); Step 3: the electromagnetic force drives the fly plate (9) to impact the metal powder at high speed, so that the high-temperature metal powder is metallurgically combined with the surface of the substrate; Step 4: the stirring needle (2) stirs the surface of the substrate to produce large plastic deformation and form a dense coating.

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