A continuous extrusion coaxial feeding friction stir additive manufacturing process method and device

Abstract

The present invention discloses a continuous extrusion coaxial feeding friction stir additive manufacturing device, comprising a spindle system and a continuous extrusion feeding system; the spindle system comprises a spindle housing, a rotating sleeve, a shoulder fixed to the lower end of the rotating sleeve, and a central stepped hole provided on the shoulder; an extrusion barrel is provided in the rotating sleeve, and the continuous extrusion feeding system comprises a continuous extrusion mechanism and a coaxial fixed sleeve installed in the rotating sleeve, the continuous extrusion mechanism comprises a fixed seat, a mold is installed in the fixed seat, a feed port is located above the mold, a heating sensor is provided in the mold, and a feed channel is formed from the feed port through the feed port, the mold through hole, the extrusion barrel to the cavity in the shoulder. The present invention integrates the rotating shaft rotation function required for friction deposition additive manufacturing and the continuous feeding process into one, and the process system is relatively simple. It can deposit a variety of materials and composite materials, and can also achieve continuous feeding to improve the efficiency of friction deposition additive manufacturing.

Description

Technical Field

[0001] The present invention relates to the field of friction deposition additive manufacturing equipment, and in particular to a continuous extrusion coaxial feeding stir friction additive manufacturing process method and device. Background Art

[0002] Friction deposition additive manufacturing (FDM) is a solid-state additive manufacturing (AM) technology. Material is conveyed through a hollow shaft. The rapid rotation of the shaft shoulder causes frictional heating and plasticization of the material. Lateral movement of the spindle system then deposits a continuous coating on the substrate, achieving the additive manufacturing goal. This technology does not undergo the melting and solidification process, making it particularly suitable for AM of metals such as aluminum and its alloys, and magnesium and its alloys. Furthermore, the stirring action of the shaft shoulder during this process ultimately produces a fine-grained structure with excellent mechanical properties. Therefore, FDM holds great promise for application in fields such as aerospace.

[0003] At present, the equipment required for this technology in China generally adopts the coaxial extrusion rod feeding form. The push rod and the rod are subjected to a large axial force of the push rod while rotating. This requires that both have good rigidity and strength. Therefore, the push rod and the rod cannot adopt a large aspect ratio. When a rod with a larger diameter is used, the deposition layer will be wider, and a larger axial pressure is required to ensure the bonding between the layers. The greater the axial pressure, the greater the required axial feeding thrust, and the greater the required equipment load capacity. In addition, the wider the deposition width, the more material will be removed in the subsequent machining process for smaller parts, resulting in low material utilization and not conducive to printing thin-walled structures. Equipment in the form of coaxial extrusion rod feeding also needs to solve the problem that the feeding system does not rotate while the push rod rotates with the shaft. The structure and transmission of the rod feeding system are relatively complex, which is not conducive to equipment reliability and life. At present, this technology in China cannot achieve continuous feeding during the additive process, resulting in low additive efficiency. Summary of the Invention

[0004] In response to the problems existing in the above-mentioned prior art, such as the complex process system of the friction deposition technology equipment, low material utilization rate, and inability to achieve continuous feeding resulting in low additive efficiency, the present invention provides a continuous extrusion coaxial feeding stir friction additive manufacturing process method and device. The present invention can integrate the rotation function of the rotating shaft required for friction deposition additive manufacturing and the continuous feeding process into one, and has the characteristics of a relatively simple process system, the ability to deposit composite materials, and the realization of continuous feeding.

[0005] The axle up and down groove at two ends embeds respectively in two guide rails up and down of being made up of the groove on the attachment piece, and the tooth on the attachment piece is meshed with tooth on upper sprocket wheel, the lower sprocket. A motor stator and an electronic rotor are provided between the rotating sleeves, the motor rotor and the rotating sleeve are interference fit, one side of the motor stator is in close contact with the inner end cover in the main shaft housing, a pressure cover is fixed to the upper end of the main shaft housing, and the other side of the motor stator is pressed by the pressure cover fixed to the upper end of the main shaft housing; the continuous extrusion feeding system includes a continuous extrusion mechanism and a fixed sleeve coaxially installed in the rotating sleeve, and the upper end surfaces of the main shaft housing, the pressure cover and the fixed sleeve are flush; the fixed sleeve is matched with the rotating sleeve through a second bearing group, and an extrusion barrel and a thermal insulation sleeve are coaxially embedded in the fixed sleeve in sequence, the lower end of the thermal insulation sleeve is flush with the lower end of the extrusion barrel and embedded in the upper part of the central stepped hole of the shaft shoulder, and the lower part of the central stepped hole forms a cavity in the shaft shoulder; the upper end of the thermal insulation sleeve is embedded in the extrusion barrel, thereby forming a sleeve structure at the upper ends of the thermal insulation sleeve and the extrusion barrel, and the sleeve structure is in close contact with the continuous extrusion mechanism.

[0006] Furthermore, the continuous extrusion coaxial feeding friction stir additive manufacturing device of the present invention, wherein:

[0007] The first bearing group includes four groups of angular contact ball bearings installed between the rotating sleeve and the lower part of the main shaft housing to withstand axial tension and pressure, and double-row cylindrical roller bearings installed between the rotating sleeve and the main shaft housing and close to the inner end cover to withstand radial force; the two ends of the outer ring of the first bearing group are pressed by the outer end cover and the inner end cover, and the two ends of the inner ring of the first bearing group are locked by the first nut and the second nut respectively; the four groups of angular contact ball bearings and the one group of double-row cylindrical roller bearings are axially fixed by the first outer sleeve and the first inner sleeve.

[0008] The second bearing group includes four groups of angular contact ball bearings respectively installed on the lower and middle parts of the rotating sleeve and the fixed sleeve, and are axially positioned by the second inner sleeve and the second outer sleeve between the lower and upper angular contact ball bearings; the lower end of the second bearing group is in close contact with the shoulder step surface provided on the inner hole of the rotating sleeve and the outer wall of the fixed sleeve, and the upper end of the second bearing group is fixed with a nut.

[0009] The continuous extrusion mechanism includes a fixed seat, a mold is installed in the fixed seat, the mold is provided with a through hole coaxial with the center hole of the thermal insulation sleeve, the lower end of the mold and the lower end of the fixed seat form an annular groove, the annular groove is in close contact with the sleeve structure formed by the thermal insulation sleeve and the upper end of the extrusion barrel; the lower end face of the fixed seat is fixed to the upper end face of the main shaft housing, the pressure cover and the fixed sleeve; an induction heating device is installed inside the mold, the upper end of the mold is provided with a guide pressure block and a stop block, an extrusion roller and a pressure roller are provided above the mold, a gap exists between the extrusion roller and the stop block, a feeding port is provided between the pressure roller and the extrusion roller, a guide plate fixed to the fixed seat is provided at the feeding port, an extrusion channel is formed between the guide plate, the guide pressure block and the extrusion roller.

[0010] There is a gap between the extrusion roller and the guide pressure block, and a feeding channel is formed from the feeding port through the extrusion channel, the mold through hole, the center hole of the insulation sleeve to the cavity in the shaft shoulder.

[0011] At the same time, the present invention also provides a process method for realizing continuous extrusion coaxial feeding stir friction additive manufacturing using the above-mentioned device, which mainly includes: after the material passes through the feeding channel, the local flow and deposition molding process in the cavity of the shoulder includes: extrusion, filling, spreading and deposition.

[0012] The extrusion, filling, spreading, and deposition processes are as follows: after the thermoplastic metal material is continuously extruded from the extruder, after it fills the cavity in the shoulder, the continued extrusion force causes the thermoplastic metal material in the cavity to be upset and spread until it is extruded and spread below the shoulder. The shoulder rotates at high speed to drive the thermoplastic metal material in the cavity to flow, and at the same time, the shoulder applies friction and extrusion forces to the thermoplastic metal material below. The entire device then moves horizontally, and the thermoplastic metal material is deposited on the substrate.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The device of the present invention is composed of an electric spindle system and a continuous extrusion feeding system. The additive process system is relatively simple. The electric spindle system mainly realizes the rotational movement of the rotating shaft and the shaft shoulder, and the continuous extrusion feeding system mainly realizes the material conveying function. The electric spindle system and the continuous extrusion feeding system do not affect each other. In addition, the magnitude of the feeding extrusion force is controlled by the motor torque, and the temperature of the material extrusion can be controlled, thereby facilitating the control of material flow and deposition.

[0015] (2) The present invention organically combines the continuous extrusion of metal wire or rod with the stir friction process, enabling additive manufacturing of a variety of materials and composite materials. It also enables long-term continuous and stable feeding, making it more suitable for printing large-scale components and achieving higher efficiency in friction deposition additive manufacturing. Furthermore, the diameter of the extruded material can be controlled, resulting in better controllability and higher dimensional accuracy during deposition molding, leading to high material utilization. This makes it a particularly suitable friction stir additive manufacturing technology for thin-walled components and localized fine structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the continuous extrusion coaxial feeding stir friction additive manufacturing device of the present invention.

[0017] Figure 2 It is a diagram of the local flow and deposition molding process of the coaxially extruded material in the cavity inside the shoulder.

[0018] In the picture:

[0019] 1-Pressure roller 2-Guide plate 3-Guide pressure block 4-Mold

[0020] 5-spindle housing 6-motor stator 7-motor rotor 8-inner end cover

[0021] 9-first nut 10-first outer sleeve 11-first inner sleeve 12-first bearing group

[0022] 13-Second nut 14-External end cover 15-Rotating sleeve 16-Shaft shoulder

[0023] 17-Insulation sleeve 18-Extrusion cylinder 19-Fixed sleeve 20-Second bearing group

[0024] 21-Second outer sleeve 22-Second inner sleeve 23-Nut 24-Gland

[0025] 25-fixed seat 26-induction heating device 27-blocking block 28-squeezing roller DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the following embodiments are by no means intended to limit the present invention in any way.

[0027] The present invention provides a continuous extrusion coaxial feeding friction stir additive manufacturing device, which comprises a spindle system and a continuous extrusion feeding system.

[0028] like Figure 1 As shown, the spindle system includes a spindle housing 5, in which a coaxial rotating sleeve 15 is provided. An inner end cover 8 is fixed between the spindle housing 5 and the rotating sleeve 15 via a shoulder step surface provided in the spindle housing 5. The inner end cover 8 divides the spindle housing 5 into a lower part and an upper part in the axial direction; an outer end cover 14 is provided at the lower end of the spindle housing 5; a shoulder 16 is fixed to the lower end of the rotating sleeve 15 by screws so that the shoulder can be replaced when it is severely worn, and the shoulder 16 is provided with a center stepped hole.

[0029] The lower portion of the spindle housing 5 is engaged with the rotating sleeve 15 via a first bearing assembly 12. External threads are provided on the rotating surfaces of the rotating sleeve 15 at the outer ends on both sides of the first bearing assembly 12. Axial positioning of the first bearing assembly 12 is achieved by the outer end cap 14, the inner end cap 8, and the first outer sleeve 10, the first inner sleeve 11, and the nut disposed between the spindle housing 5 and the rotating sleeve 15. During the material addition process, the rotating sleeve 15 rotates at high speed and is simultaneously subjected to axial pressure and torque. Furthermore, during lateral movement, the rotating sleeve 15 is also subjected to radial forces, the axial pressure and radial forces of which are borne by the first bearing assembly 12. Therefore, the selected bearings should be able to withstand the required axial and radial forces simultaneously during high-speed rotation. In the present invention, the first bearing group 12 includes four groups of angular contact ball bearings installed between the rotating sleeve 15 and the lower part of the main shaft housing 5 to withstand axial tension and pressure, and double-row cylindrical roller bearings installed between the rotating sleeve 15 and the main shaft housing 5 and close to the inner end cover 8 to withstand radial force; the two ends of the outer ring of the first bearing group 12 are pressed by the outer end cover 14 and the inner end cover 8, and the outer end cover 14, the inner end cover 8 and the main shaft housing 5 are fixed by screws, and the two ends of the inner ring of the first bearing group 12 are respectively locked by the first nut 9 and the second nut 13; the four groups of angular contact ball bearings and the one group of double-row cylindrical roller bearings are axially fixed by the first outer sleeve 10 and the first inner sleeve 11.

[0030] A motor stator 6 and an electric rotor 7 are disposed between the upper portion of the spindle housing 5 and the rotating sleeve 15. The motor stator 6 is mounted on the upper portion of the spindle housing 5, with one side of the motor stator 6 in close contact with the inner end cap 8 within the spindle housing 5. The motor rotor 7 is installed on the rotating sleeve 15 with an interference fit. A gland 24 is fixed to the upper end of the spindle housing 5, and the other side of the motor stator 7 is compressed by the gland 24 fixed to the upper end of the spindle housing 5. This constitutes an independent electric spindle system, thereby achieving high-speed rotation of the rotating shaft.

[0031] The continuous extrusion feeding system includes a continuous extrusion mechanism and a fixed sleeve 19 coaxially installed in the rotating sleeve 15. The upper end surfaces of the spindle housing 5, the pressure cover 24 and the fixed sleeve 19 are flush. In order to ensure that the material can be smoothly fed to the substrate, it is required that during the additive process, the fixed sleeve 19 does not rotate when the rotating sleeve 15 rotates at high speed. Therefore, the fixed sleeve 19 is matched with the rotating sleeve 15 through the second bearing group 20. Specifically, the second bearing group 20 includes four groups of angular contact ball bearings respectively installed on the lower and middle parts of the rotating sleeve 15 and the fixed sleeve 19. The outer ring of the second bearing group 20 is fixed to the rotating sleeve 15, and the inner ring of the second bearing group 20 is fixed to the fixed sleeve 19. The four groups of angular contact ball bearings are arranged in a "two on top and two on bottom" manner, and the second inner sleeve 22 and the second outer sleeve 21 are used to axially position the lower and upper angular contact ball bearings; the lower end of the second bearing group 20 is in close contact with the shoulder step surface provided on the inner hole of the rotating sleeve 15 and the outer wall of the fixed sleeve 19, and the upper end of the second bearing group 20 is fixed with a nut 23.

[0032] An extrusion barrel 18 is coaxially mounted within the fixed sleeve 19. A thermal insulation sleeve 17 is mounted within the extrusion barrel 18. This sleeve is used to isolate heat from the thermoplastic metal material, maintaining its thermoplastic state while preventing this heat from overheating the electric spindle system. The lower end of the thermal insulation sleeve 17 is flush with the lower end of the extrusion barrel 18 and is embedded in the upper portion of the central stepped hole of the shoulder 16 in the spindle system. The lower portion of the central stepped hole forms a cavity within the shoulder 16. The upper end of the thermal insulation sleeve 17 is embedded within the extrusion barrel 18, forming a sleeve structure between the thermal insulation sleeve 17 and the upper end of the extrusion barrel 18.

[0033] The continuous extrusion mechanism includes a fixed seat 25, in which a mold 4 is installed to determine the shape and size of the extruded material. The lower end of the mold 4 is in close contact with the extrusion barrel 18 and is installed in conjunction with the fixed seat 25. That is, the mold 4 is provided with a through hole coaxial with the center hole of the thermal insulation sleeve 17. The lower end of the mold 4 and the lower end of the fixed seat 25 form an annular groove, which is in close contact with the sleeve structure formed by the thermal insulation sleeve 17 and the upper end of the extrusion barrel 18. The lower end face of the fixed seat 25 is fixed to the upper end face of the spindle housing 5, the pressure cover 24, and the fixed shaft sleeve 19. The mold 4 is internally equipped with an induction heating device 26 to further heat and raise the temperature of the material so that it remains in a thermoplastic state during extrusion, with less resistance to deformation during extrusion. The upper end of the mold 4 is provided with a guide pressure block 3 and a material stop block 27. An extrusion roller 28 and a pressure roller 1 are provided above the mold 4. A certain installation distance is set between the extrusion roller 28 and the guide pressure block 3 to form a cavity. This cavity is determined by the size of the feed material and is used to convey the material. The guide pressure block 3 is used to withstand the extrusion of the material and serve as a guide. The pressure roller 1 is installed above the extrusion roller 28. A feed port is formed between the pressure roller 1 and the extrusion roller 28 to feed the material into the cavity between the extrusion roller 28 and the guide pressure block 3. A guide plate 2 fixed to the fixing seat 25 is provided at the feed port to serve as a guide. There is a gap between the extrusion roller 28 and the stop block 27, and an extrusion channel is formed between the guide plate 2, the guide pressure block 3 and the extrusion roller 28. During the rotation of the extrusion roller 28, the stop block 27 is fixed to hinder the movement of the material, so that the material can smoothly enter the mold 4 through the extrusion channel, and a feeding channel is formed from the feed port through the extrusion channel, the mold through hole, the center hole of the insulation sleeve 17 to the cavity in the shaft shoulder 16.

[0034] In the present invention, the electric spindle system is fixed to the continuous extrusion system by screws.

[0035] The process of implementing continuous extrusion coaxial feeding friction stir additive manufacturing using the continuous extrusion coaxial feeding friction stir additive manufacturing device of the present invention is mainly as follows: after the material passes through the feeding channel, the local flow and deposition molding process in the cavity 161 of the shoulder 16 includes: extrusion, filling, spreading, and deposition. The extrusion, filling, spreading, and deposition process is as follows: after the thermoplastic metal material is continuously extruded from the extruder barrel 18 and fills the cavity 161 of the shoulder 16, the continuous extrusion force causes the thermoplastic metal material in the cavity to be roughened and spread until it is extruded and spread below the shoulder 16. The shoulder 16 rotates at high speed to drive the thermoplastic metal material in the cavity to flow, and at the same time, the shoulder 16 applies friction and extrusion forces to the thermoplastic metal material below. The entire device then moves horizontally, and the thermoplastic metal material is deposited on the substrate.

[0036] The specific working process of the device of the present invention is as follows:

[0037] When the electric spindle system is powered on, the motor rotor 7 rotates, driving the rotating sleeve 15 to rotate at high speed, thereby driving the shaft shoulder 16 to rotate, completing the spindle's motion function. The motor (including a reducer) drives the extrusion roller 28 of the continuous extrusion feeding system to rotate. Under the pressure of the pressure roller 28, the extrusion roller 28 continuously feeds the thermoplastic metal material, which can be either bar stock or wire, into the gap between the extrusion roller 28 and the pressure roller 1, i.e., the feed port. The extrusion roller 28 uses friction to bring the metal material into the die 4. Simultaneously, the metal material is subjected to intense friction, shearing, and extrusion within the extrusion channel, causing thermoplastic deformation. Frictional heat and deformation heat increase the material's temperature. After the thermoplastic metal material is continuously extruded until it fills the cavity of the die 4, it is further heated by the induction heating device 26 positioned within the die 4 to maintain its thermoplastic state.

[0038] Due to the action of mold 4, the thermoplastic metal material enters the extrusion barrel 18, located in the center of the spindle system, at a predetermined size. This barrel is equipped with a ceramic thermal insulation sleeve 17 to maintain a high temperature. The thermoplastic metal material is continuously extruded from the extrusion barrel 18. After it fills the cavity 161 within the friction stir additive tool, the continued extrusion force causes the material in the tool cavity to be roughened and spread until it is extruded and spread below the shoulder. The high-speed rotation of the tool (driven by the rotating sleeve 15 of the motor rotor 7, which in turn drives the shoulder 16) drives the thermoplastic metal in the cavity to flow, while simultaneously applying friction and extrusion forces to the thermoplastic metal below through the shoulder 16. The spindle system of the device is then moved horizontally, allowing the thermoplastic metal material to be deposited on the substrate. Figure 2 The figure shows the local flow and deposition molding process of the coaxially extruded material in the cavity inside the shoulder.

[0039] Although the present invention has been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can make many variations without departing from the purpose of the present invention, and these are all protected by the present invention.

Claims

1. A continuous extrusion coaxial feeding friction stir additive manufacturing device, characterized in that: Including spindle system and continuous extrusion feeding system; The spindle system comprises a spindle housing (5), a coaxial rotating sleeve (15) is provided in the spindle housing (5), an inner end cover (8) is fixed between the spindle housing (5) and the rotating sleeve (15) via a shoulder step surface provided in the spindle housing (5), and the inner end cover (8) divides the spindle housing (5) into a lower part and an upper part in the axial direction; an outer end cover (14) is provided at the lower end of the spindle housing (5); a shoulder (16) is fixed at the lower end of the rotating sleeve (15), and the shoulder (16) is provided with a central stepped hole; The lower portion of the spindle housing (5) is engaged with the rotating sleeve (15) via a first bearing group (12); the rotating sleeve (15) is provided with external threads on the rotating surfaces of the outer ends on both sides of the first bearing group (12); the axial positioning of the first bearing group (12) is achieved by the outer end cover (14), the inner end cover (8), and the first outer sleeve (10), the first inner sleeve (11) and the nut arranged between the spindle housing (5) and the rotating sleeve (15); A motor stator (6) and a motor rotor (7) are provided between the upper portion of the spindle housing (5) and the rotating sleeve (15); the motor rotor (7) and the rotating sleeve (15) are interference-fitted; one side of the motor stator (6) is in close contact with the inner end cover (8) in the spindle housing (5); a pressure cover (24) is fixed to the upper end of the spindle housing (5); and the other side of the motor stator (6) is pressed by the pressure cover (24) fixed to the upper end of the spindle housing (5); The continuous extrusion feeding system comprises a continuous extrusion mechanism and a fixed sleeve (19) coaxially mounted in the rotating sleeve (15), and the upper end surfaces of the spindle housing (5), the pressure cover (24) and the fixed sleeve (19) are flush; The fixed sleeve (19) cooperates with the rotating sleeve (15) through a second bearing group (20), and the extrusion barrel (18) and the heat-insulating sleeve (17) are coaxially embedded in the fixed sleeve (19). The lower end of the heat-insulating sleeve (17) is flush with the lower end of the extrusion barrel (18) and is embedded in the upper part of the central stepped hole of the shoulder (16). The lower part of the central stepped hole forms a cavity in the shoulder (16); the upper end of the heat-insulating sleeve (17) is embedded in the extrusion barrel (18), thereby forming a sleeve structure at the upper end of the heat-insulating sleeve (17) and the extrusion barrel (18), and the sleeve structure is in close contact with the continuous extrusion mechanism.

2. The continuous extrusion coaxial feeding friction stir additive manufacturing device according to claim 1, characterized in that: The first bearing group (12) includes four groups of angular contact ball bearings installed between the rotating sleeve (15) and the lower part of the main shaft housing (5) for bearing axial tension and pressure, and a double row cylindrical roller bearing installed between the rotating sleeve (15) and the main shaft housing (5) and close to the inner end cover (8) for bearing radial force; the two ends of the outer ring of the first bearing group (12) are pressed by the outer end cover (14) and the inner end cover (8), and the two ends of the inner ring of the first bearing group (12) are locked by the first nut (9) and the second nut (13) respectively; the four groups of angular contact ball bearings and the double row cylindrical roller bearing are axially fixed by the first outer sleeve (10) and the first inner sleeve (11).

3. The continuous extrusion coaxial feeding friction stir additive manufacturing device according to claim 1, characterized in that: The second bearing group (20) includes four groups of angular contact ball bearings respectively mounted on the lower and middle parts of the rotating sleeve (15) and the fixed sleeve (19), and is axially positioned by a second inner sleeve (22) and a second outer sleeve (21) between the lower and upper angular contact ball bearings; the lower end of the second bearing group (20) is in close contact with the shoulder step surface provided on the inner hole of the rotating sleeve (15) and the outer wall of the fixed sleeve (19), and the upper end of the second bearing group (20) is fixed by a nut (23).

4. The continuous extrusion coaxial feeding friction stir additive manufacturing device according to claim 1, characterized in that: The continuous extrusion mechanism includes a fixed seat (25), wherein a mold (4) is installed in the fixed seat (25), and the mold (4) is provided with a through hole coaxial with the center hole of the heat insulating sleeve (17). The lower end of the mold (4) and the lower end of the fixed seat (25) form an annular groove, and the annular groove is in close contact with the sleeve structure formed by the heat insulating sleeve (17) and the upper end of the extrusion cylinder (18); the lower end surface of the fixed seat (25) is fixed to the upper end surface of the main shaft housing (5), the pressure cover (24) and the fixed sleeve (19); The mold (4) is provided with an induction heating device (26) inside, the upper end of the mold (4) is provided with a guide pressure block (3) and a stop block (27), an extrusion roller (28) and a pressure roller (1) are provided above the mold (4), a gap is provided between the extrusion roller (28) and the stop block (27), a feed port is provided between the pressure roller (1) and the extrusion roller (28), a guide plate (2) fixed to the fixed seat (25) is provided at the feed port, and an extrusion channel is formed between the guide plate (2), the guide pressure block (3) and the extrusion roller (28).

5. The continuous extrusion coaxial feeding friction stir additive manufacturing device according to claim 4, characterized in that: There is a gap between the extrusion roller (28) and the guide pressure block (3), and a feeding channel is formed from the feeding port through the extrusion channel, the mold through hole, the center hole of the insulation sleeve to the cavity in the shaft shoulder (16).

6. A process for realizing continuous extrusion coaxial feeding friction stir additive manufacturing using the continuous extrusion coaxial feeding friction stir additive manufacturing device according to any one of claims 5, characterized in that: After the material passes through the feeding channel, the local flow and deposition molding process in the cavity of the shoulder (16) includes: extrusion, filling, spreading and deposition.

7. The process of continuous extrusion coaxial feeding friction stir additive manufacturing according to claim 6, characterized in that: The extrusion, filling, spreading and deposition process is as follows: after the thermoplastic metal material is continuously extruded from the extrusion barrel (18), after it fills the cavity in the shoulder (16), the continuous extrusion force causes the thermoplastic metal material in the cavity to be roughened and spread until it is extruded and spread below the shoulder (16); the shoulder (16) rotates at high speed to drive the thermoplastic metal material in the cavity to flow, and at the same time, friction and extrusion forces are applied to the thermoplastic metal material below through the shoulder (16); then the entire device moves in a horizontal direction, and the thermoplastic metal material is deposited on the substrate.

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