Variable radius wire on arbor tooling for friction stir additive manufacturing

Abstract

A variable radius wire cutting tool type hollow feeding wire material friction stir additive equipment relates to the field of wire material friction stir additive, and includes a connecting seat plate, a wire feeding device, a driving motor, an additive outer shell, an additive main shaft, a stirring pressure head and a pressure head jacket; the additive main shaft is provided with a material falling hole penetrating up and down, the upper portion of the additive main shaft is provided with a wire cutting seat, the wire cutting seat is provided with a tool installation hole, the tool installation hole is provided with a variable radius wire cutting tool, the cross section of the variable radius wire cutting tool is in the shape of an involute with gradually decreasing radius, the wire cutting edge of the variable radius wire cutting tool is located above the material falling hole, the wire cutting seat is provided with a wire inlet hole matched with the variable radius wire cutting tool, and the wire inlet hole is provided with a wire feeding sleeve; the stirring pressure head is provided with a feeding channel communicating the material falling hole and a spiral groove.The present application has the advantages of not occupying the space outside the stirring pressure head by the wire feeding sleeve, improving the flexibility of the equipment, reducing the working difficulty of the equipment, improving the production efficiency and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wire friction stir additive manufacturing, and particularly relates to a variable radius wire cutting tool type hollow feeding wire friction stir additive manufacturing equipment. BACKGROUND

[0002] Manufacturing aircraft structural components with high-performance materials is one of the important ways to reduce the weight of aircraft, improve the carrying capacity and flight speed. Wire friction stir additive manufacturing technology is a new manufacturing method with unique advantages. This technology uses the friction heat effect to make metal wires uniformly deposit in a thermoplastic state, forming high-quality whole large-size components. Compared with traditional manufacturing methods, wire friction stir additive manufacturing technology not only has high material utilization rate, but also can meet the production needs of personalized parts, and is suitable for complex shape and high strength requirement parts. Wire friction stir additive manufacturing technology precisely controls the temperature and pressure during the deposition process, making the bonding between the deposited layers more compact, and improving the mechanical properties of the components. Compared with laser, electron beam and electric arc energy deposition additive manufacturing technologies, wire friction stir additive manufacturing technology has higher material utilization rate and better structural performance, and is becoming an important technology in the field of aerospace.

[0003] As a new high-efficiency additive manufacturing method, wire friction stir additive manufacturing technology has shown great potential in the field of high-performance metal part manufacturing in recent years. This technology uses the friction heat effect to deposit metal wires layer by layer in a solid state, forming complex shape and high-quality whole large-size components. Wire friction stir additive manufacturing technology does not require high-energy heat sources and gas protection, and can use various specifications of metal wires. By precisely controlling the movement of the stirring pressure head and heat input, the material flows and connects in a solid state, avoiding defects such as thermal cracks and pores in the melting process. This technology is particularly suitable for manufacturing or repairing key components with high strength and high performance requirements, such as titanium alloy frame structures, nickel-based high-temperature alloy rocket combustion chambers and high-strength aluminum alloy heavy-lift launch vehicle connecting rings.

[0004] The existing wire stirring friction additive equipment includes a connecting seat plate, a wire feeding device, a driving motor, an additive outer shell, an additive spindle, a stirring pressure head and a pressure head sleeve; the wire feeding device, the driving motor and the additive outer shell are fixedly installed on the connecting seat plate, the additive spindle is freely rotatably installed in the additive outer shell, the output shaft of the driving motor is connected with the additive spindle through a transmission device to drive the rotation of the additive spindle; the stirring pressure head is fixedly installed at the lower end of the additive spindle, the pressure head sleeve is sleeved on the outside of the stirring pressure head (gap) in cooperation with the stirring pressure head, and is fixedly connected with the additive outer shell, a spiral groove is arranged on the outside of the stirring pressure head, a wire inlet hole matched with the spiral groove is arranged on the pressure head sleeve, and a wire feeding sleeve is installed on the wire inlet hole. When working, the connecting seat plate is installed on the driving device, the wire feeding device inputs the metal wire into the pressure head sleeve through the wire feeding sleeve, the driving motor drives the additive spindle to rotate through the transmission device, and drives the stirring pressure head to rotate; when the spiral groove on the outside of the stirring pressure head is opposite to the wire inlet hole, the metal wire is pressed into the spiral groove, the stirring pressure head continues to rotate, and the metal wire in the spiral groove is cut into additive particles through the shearing action of the edge of the spiral groove and the edge of the wire inlet hole, the additive particles fall along the spiral groove to the additive working plane on the lower side of the stirring pressure head, and plastic deformation is generated under the combined stirring and friction action of the convex points on the stirring pressure head and the lower end face of the stirring pressure head, and is finally formed on the additive surface; the driving device drives the connecting seat plate to move through program control, the structure deposition of points, lines and surfaces can be completed, and then related parts can be manufactured or repaired. The existing wire stirring friction additive equipment adopts bottom (stirring pressure head) wire feeding, the wire feeding sleeve occupies a larger space on the outside of the stirring pressure head, cannot work in a smaller space, and limits the application of the wire stirring friction additive in the manufacturing and repairing field of complex components; the metal wire output by the wire feeding device cannot continuously enter the wire inlet hole, only when the spiral groove is opposite to the wire inlet hole, the metal wire can enter the spiral groove from the wire inlet hole in a short time, in order to meet the feeding requirement, the rotating speed of the stirring pressure head is low, and the additive efficiency is low; due to the small distance between the wire inlet hole and the additive surface, the gap between the stirring pressure head and the pressure head sleeve allows the hot plasticized alloy material to move upward, causes the blocking of the wire feeding hole, affects the speed of the metal wire entering the spiral groove from the wire inlet hole, and makes it difficult to control the additive process. SUMMARY

[0005] The purpose of the present application is to solve the above-mentioned problems of the prior art, and to provide a variable radius wire cutting tool type hollow feeding wire stirring friction additive equipment which does not occupy the space on the outside of the stirring pressure head, improves the working space of the equipment, does not cause the blocking of the wire feeding hole, reduces the working difficulty of the equipment, and improves the production efficiency.

[0006] The technical scheme of the present application is:

[0007] A variable radius wire cutting tool type hollow feeding wire friction stir additive equipment, comprising a connecting seat plate, a wire feeding device, a driving motor, an additive outer shell, an additive spindle, a stirring pressure head and a pressure head jacket; the wire feeding device, the driving motor and the additive outer shell are fixedly installed on the connecting seat plate, the additive spindle is freely rotatably installed in the additive outer shell, the output shaft of the driving motor is connected with the additive spindle through a transmission device to drive the rotation of the additive spindle; the stirring pressure head is fixedly installed at the lower end of the additive spindle, the pressure head jacket is sleeved on the outside of the stirring pressure head in cooperation with the stirring pressure head and is fixedly connected with the additive outer shell, a spiral groove is arranged on the outside of the stirring pressure head, characterized in that a blanking hole penetrating through the upper and lower parts of the additive spindle is arranged on the additive spindle, a wire cutting seat is arranged above the additive spindle, a circular tool mounting hole is arranged on the wire cutting seat opposite to the upper end of the additive spindle, a variable radius wire cutting tool coaxial with the additive spindle is arranged in the tool mounting hole, the cross section of the variable radius wire cutting tool is in the shape of a involute with gradually decreasing radius, the wire cutting edge of the variable radius wire cutting tool is located above the blanking hole, a wire inlet hole matched with the variable radius wire cutting tool is arranged on the wire cutting seat, and a wire feeding sleeve is installed on the wire inlet hole; a feeding channel communicating the blanking hole and the spiral groove is arranged on the stirring pressure head. The wire feeding device is fixedly installed on the connecting seat plate above the wire feeding sleeve.

[0008] The additive outer shell comprises an outer support frame, an upper bearing seat, a middle bearing seat and a lower bearing seat, the upper bearing seat and the middle bearing seat are fixedly connected with the outer support frame, the lower bearing seat is fixedly connected with the middle bearing seat, and the additive spindle is connected with the upper bearing seat, the middle bearing seat and the lower bearing seat through the upper bearing set, the middle bearing set and the lower bearing.

[0009] The transmission device comprises a driving pulley, a transmission belt and a driven pulley, the driving pulley is installed on the output shaft of the driving motor, the driven pulley is installed on the additive spindle between the upper bearing set and the middle bearing set, and the driving pulley and the driven pulley are connected through the transmission belt. The transmission belt is a toothed belt.

[0010] A cooling jacket is arranged on the outside of the additive spindle between the middle bearing seat and the lower bearing seat, the upper end of the cooling jacket is fixedly connected with the middle bearing seat, the lower end of the cooling jacket is fixedly connected with the lower bearing seat, an annular input transfer groove and an output transfer groove are arranged on the inner wall of the cooling jacket, a medium inlet is arranged on one side of the input transfer groove, and a medium outlet is arranged on one side of the output transfer groove; a cooling flow channel is arranged in the additive spindle, one end of the cooling flow channel is communicated with the input transfer groove, and the other end of the cooling flow channel is communicated with the output transfer groove; an upper sealing ring is installed on the upper end of the cooling jacket, and a lower sealing ring is installed on the lower end of the cooling jacket.

[0011] The cooling flow channel comprises at least one upflow channel parallel to the axis of the additive spindle and at least one downflow channel parallel to the axis of the additive spindle, the lower end of the upflow channel is communicated with the input adapter groove through the input connecting hole, and the lower end of the downflow channel is communicated with the output adapter groove through the output connecting hole; the upper end of the upflow channel and the upper end of the downflow channel are connected through an annular connecting hole.

[0012] The variable-radius wire cutting tool further comprises a connecting seat and a cutting part, the cutting part is fixedly connected to the upper side of the connecting seat, the connecting seat is connected to the upper end of the additive spindle, the cutting part is in a columnar shape, the outer edge of the cross section of the cutting part is in a involute shape with gradually decreasing radius from the outer blade part to the inner root part of the wire cutting blade; a material collecting hole is arranged above the connecting seat above the blanking hole, and the wire cutting blade is located above the material collecting hole; the wire cutting blade is inclined backward from top to bottom at the cutting metal wire position.

[0013] The stirring pressure head comprises a cylindrical pressure head body, a pressure head connecting seat is arranged on the outer side of the pressure head body, the pressure head connecting seat is connected to the lower end of the additive spindle, a spiral groove is arranged on the outer side of the pressure head body below the pressure head connecting seat, a feeding channel is arranged in the pressure head body, the feeding channel comprises a conical collecting hole, a circular falling hole and a spiral groove communication hole connected in sequence from top to bottom, the large inner diameter end of the conical collecting hole is connected to the lower end of the blanking hole, the conical collecting hole and the circular falling hole are coaxial with the additive spindle, the upper end of the spiral groove communication hole is communicated with the lower end of the circular falling hole, and the lower end is communicated with the upper part of the spiral groove. A pressure head convex point is arranged on the lower end surface of the pressure head body.

[0014] In use of the present application, the connecting seat plate is installed on the driving device, the wire feeding device inputs the metal wire material into the cutter installation hole through the wire feeding sleeve, the wire inlet hole, and abuts against the outside of the variable radius wire cutting cutter, the driving motor drives the additive main shaft to rotate through the transmission device, the variable radius wire cutting cutter rotates under the driving of the additive main shaft, the distance between the outside of the variable radius wire cutting cutter and the wire inlet hole gradually increases during the rotation of the variable radius wire cutting cutter, the size of the metal wire material entering the cutter installation hole gradually increases, until the variable radius wire cutting cutter rotates to the wire cutting blade, the wire cutting blade cooperates with the edge of the wire inlet hole to cut the metal wire material into additive particles, the additive particles fall into the spiral groove through the blanking hole and the feeding channel, and then fall from the spiral groove to the additive working plane below the stirring pressure head, plastic deformation is generated under the combined stirring and friction of the protrusions on the stirring pressure head and the lower end surface of the stirring pressure head, and finally is formed on the additive surface. The present application completes the wire feeding function above the additive main shaft, the wire feeding device does not affect the space outside the stirring pressure head, can work in a smaller space, and has wide application range; the metal wire material output by the wire feeding device can continuously enter the wire inlet hole, the stirring speed of the stirring pressure head has little effect on the wire feeding, the plasticized metal at the stirring pressure head does not affect the speed of the metal wire material entering the wire inlet hole, the additive process is easy to control, and the present application improves the additive manufacturing efficiency and quality. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to make the content of the present application more easily and clearly understood, the present application will be further described in detail below according to specific embodiments of the present application and in conjunction with the drawings.

[0016] Figure 1 is a perspective structural schematic diagram of the present application;

[0017] Figure 2 is a front view structural schematic diagram of the present application;

[0018] Figure 3 is Figure 2 an A-A sectional view of

[0019] Figure 4 is Figure 3 a B local enlarged view of

[0020] Figure 5 is Figure 2 a right view of

[0021] Figure 6 is Figure 5 a C-C sectional view of

[0022] Figure 7 is Figure 6 a D local enlarged view of

[0023] Figure 8 is a perspective structural schematic diagram of the variable radius wire cutting cutter in the present application;

[0024] Figure 9 This is a three-dimensional structural diagram of the stirring head in this invention;

[0025] Figure 10 This is a schematic diagram of the main structure of the stirring head in this invention;

[0026] Figure 11 yes Figure 10 EE sectional view. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0028] like Figures 1-7 The variable radius filament cutting blade type hollow feeding filament friction additive manufacturing equipment shown includes a connecting base plate 5, a filament feeding device 2, a drive motor 1, an additive housing, an additive spindle 9, a stirring head, and a head jacket 28; the filament feeding device 2, the drive motor 1, and the additive housing are fixedly mounted on the connecting base plate 5, from which... Figure 1 , Figure 2 As can be seen, the wire feeding device 2 is directly installed on the connecting base plate 5, from Figure 3 It can be seen that the drive motor 1 is fixedly connected to the connecting base plate 5 via the support frame plate 3. For example... Figure 3 , Figure 4 As shown, the additive housing includes an outer support frame 11, an upper bearing seat 8, a middle bearing seat 12, and a lower bearing seat 15. The upper bearing seat 8 and the middle bearing seat 12 are fixedly connected to the outer support frame 11 by bolts, and the lower bearing seat 15 is fixedly connected to the middle bearing seat 12. The additive spindle 9 is installed in the upper bearing seat 8, the middle bearing seat 12, and the lower bearing seat 15 via an upper bearing assembly 19, a middle bearing assembly 13, and a lower bearing 14, respectively. A drive pulley 17 is installed on the output shaft of the drive motor, and a driven pulley 18 is installed on the additive spindle between the upper bearing assembly and the middle bearing assembly. The drive pulley 17 and the driven pulley 18 are connected by a transmission belt. The drive pulley, the transmission belt, and the driven pulley constitute a transmission device used to transmit power from the drive motor to the additive spindle and drive it to rotate. The connection structure between the additive spindle and the additive housing, as well as the installation position of the transmission device, make the working process of the additive spindle smoother and improve the additive quality.

[0029] like Figure 3 , Figure 4As shown, the stirring pressure head is fixed by bolt mounting on the lower end of the additive main shaft, the pressure head jacket 28 is sleeved on the outside of the stirring pressure head in clearance fit, and is fixedly connected with the lower bearing seat 15, the spiral groove 30 is arranged on the outer side of the stirring pressure head, the central part of the additive main shaft 9 is provided with a blanking hole 10 penetrating through the upper and lower parts, the upper part of the additive main shaft 9 is provided with a wire cutting seat 6 fixedly connected with the upper bearing seat 8, the wire cutting seat 6 is provided with a cylindrical cutter mounting hole opposite to the upper end of the additive main shaft 9, and the cutter mounting hole is provided with a variable radius wire cutting tool connected with the additive main shaft 9 coaxially. Figure 8 As shown, the variable radius wire cutting tool comprises a connecting seat 34 and a cutting part 33, and the cutting part 33 is fixedly connected to the upper side of the connecting seat 34. The connecting seat 34 is connected with the upper end of the additive main shaft 9 by bolt, the cutting part 33 is in a cylindrical shape, the outer edge 35 of the cross section of the cutting part 33 is in a involute shape with gradually decreasing radius from the outer blade part 38 of the wire cutting blade 37 to the inner root part 36, the connecting seat 34 above the blanking hole 10 is provided with a material collecting hole 40, and the wire cutting blade 37 is located above the material collecting hole 40; the wire cutting seat 6 is provided with a wire inlet hole 32 communicating with the cutter mounting hole and matched with the variable radius wire cutting tool, and a wire feeding sleeve 4 is mounted on the outside of the wire inlet hole 32; the wire feeding device 2 is fixedly mounted on the connecting seat plate above the wire feeding sleeve; the metal wire provided by the wire feeding device 2 enters the wire inlet hole 32 and the cutter mounting hole through the wire feeding sleeve 4, and is intermittently cut into additive particles by the variable radius wire cutting tool. The stirring pressure head is provided with a material feeding channel communicating with the blanking hole 10 and the spiral groove 30. Figure 9 、 Figure 10 、 Figure 11 As shown, the stirring pressure head comprises a cylindrical pressure head body 29, the pressure head body 29 is provided with a pressure head connecting seat 41 on the outside, the pressure head connecting seat 41 can be connected with the lower end of the additive main shaft by bolt, the spiral groove 30 is arranged on the outer side wall of the pressure head body 29 below the pressure head connecting seat 41, the lower end of the spiral groove 30 is located on the lower end surface of the pressure head body 29, the material feeding channel is located in the inside of the pressure head body 29, and the material feeding channel comprises a conical collecting hole 26, a circular falling hole 27 and a spiral groove communicating hole 42 connected in sequence from top to bottom, the large inner diameter end of the conical collecting hole 26 is connected with the lower end of the blanking hole, the conical collecting hole 26 and the circular falling hole 27 are coaxial with the additive main shaft, the upper end of the spiral groove communicating hole 42 is communicated with the lower end of the circular falling hole 27, and the lower end of the spiral groove communicating hole 42 is communicated with the upper part of the spiral groove 30. The pressure head convex point 31 is arranged on the lower end surface of the pressure head body 29.

[0030] Further improvement, the lower part 39 of the wire cutting blade 37 is inclined backward from top to bottom; during operation, the wire cutting blade moves from back to front, and the lower part of the wire cutting blade 37 which is inclined backward from top to bottom cuts the metal wire and generates a pushing force to the metal wire to move to the oblique lower side, so that the metal wire is stably dropped into the material collecting hole 40 in front of the lower side of the cutting metal wire part 39 of the lower part of the wire cutting blade 37, and the operation is more stable.

[0031] Further improvements, such as Figure 4 As shown, the additive main shaft 9 between the middle bearing seat 12 and the lower bearing seat 15 is provided with a cooling jacket 24, the upper end of the cooling jacket 24 is fixedly connected with the middle bearing seat 12, the lower end of the cooling jacket 24 is fixedly connected with the lower bearing seat 15, the inner wall of the cooling jacket 24 is provided with an annular input transfer groove 171 and an output transfer groove 23, the side of the cooling jacket of the input transfer groove 171 is provided with a medium inlet 25, the side of the cooling jacket of the output transfer groove 23 is provided with a medium outlet 16; the additive main shaft 9 is provided with a cooling flow channel, one end of the cooling flow channel is communicated with the input transfer groove 171, the other end of the cooling flow channel is communicated with the output transfer groove 23; the upper end of the cooling jacket is provided with an upper sealing ring through an upper gland, the lower end of the cooling jacket is provided with a lower sealing ring through a lower gland. As can be seen from the figure, the cooling flow channel includes at least one up-flow channel 22 parallel to the axis of the additive main shaft and at least one down-flow channel 21 parallel to the axis of the additive main shaft, the lower end of the up-flow channel 22 is communicated with the input transfer groove 171 through an input connecting hole, the lower end of the down-flow channel 21 is communicated with the output transfer groove 23 through an output connecting hole; the upper end of the up-flow channel 22 and the upper end of the down-flow channel 21 are connected through an annular connecting hole 20. The cooling medium enters from the medium inlet 25, flows through the cooling flow channel and then flows out from the medium outlet 16, which can cool and cool the lower part of the additive main shaft and the upper part of the stirring pressure head, avoid fatigue failure of bearing parts caused by high temperature, and avoid too much plasticization of additive particles in the spiral groove and even the feeding channel due to heat conduction caused by long-time work; improve the additive quality.

[0032] In the application, the connecting seat plate is installed on the driving device, the wire feeding device inputs the metal wire into the cutter installation hole through the wire feeding sleeve, the wire inlet hole and abuts against the outside of the variable radius wire cutting cutter, the driving motor drives the additive main shaft to rotate through the transmission device, the variable radius wire cutting cutter rotates under the driving of the additive main shaft, the distance between the outside of the variable radius wire cutting cutter and the wire inlet hole gradually increases during the rotation of the variable radius wire cutting cutter, the size of the metal wire entering the cutter installation hole gradually increases, and the wire inlet hole is prevented from being blocked. Until the variable radius wire cutting cutter rotates to the wire cutting blade, the wire cutting blade cooperates with the edge of the wire inlet hole to cut the metal wire into additive particles, the additive particles fall into the spiral groove through the blanking hole and the feeding channel, and then fall to the additive working plane below the stirring pressure head from the spiral groove, plastic deformation is generated under the combined stirring and friction of the convex points on the stirring pressure head and the lower end surface of the stirring pressure head, and finally is formed on the additive surface. The application completes the wire feeding function above the additive main shaft, the wire feeding device does not affect the space outside the stirring pressure head, can work in a smaller space, and has a wide application range; the metal wire output by the wire feeding device can continuously enter the wire inlet hole, the stirring speed of the stirring pressure head has little effect on the wire feeding, the thermoplastic metal at the stirring pressure head does not affect the speed of the metal wire entering the wire inlet hole, the additive process is easy to control, and the application improves the additive manufacturing efficiency and quality.

Claims

1. A variable radius wire-cutting tool type hollow feeding wire material friction stir additive manufacturing equipment, comprising a connecting base plate, a wire feeding device, a driving motor, an additive manufacturing outer shell, an additive manufacturing spindle, a stirring ram and a ram collet; the wire feeding device, the driving motor and the additive manufacturing outer shell are fixedly installed on the connecting base plate, the additive manufacturing spindle is freely rotatably installed in the additive manufacturing outer shell, the output shaft of the driving motor is connected with the additive manufacturing spindle through a transmission device to drive it to rotate; the stirring ram is fixedly installed at the lower end of the additive manufacturing spindle, the ram collet is sleeved on the outside of the stirring ram in cooperation with the stirring ram and is fixedly connected with the additive manufacturing outer shell, and a helical groove is arranged on the outside of the stirring ram, characterized in that, The additive spindle is provided with a material dropping hole penetrating through the additive spindle from top to bottom, and a wire cutting seat is arranged above the additive spindle.

2. The variable-radius wire-on-wire FSW additive manufacturing apparatus of claim 1, wherein, The additive shell comprises an outer support frame, an upper bearing seat, a middle bearing seat and a lower bearing seat.

3. The variable-radius wire-on-wire FSW additive manufacturing apparatus of claim 2, wherein, The transmission device comprises a driving pulley, a transmission belt and a driven pulley.

4. The variable-radius wire-on-wire FSW additive manufacturing apparatus of claim 3, wherein, The transmission belt is a toothed belt.

5. The variable-radius wire-on-wire FSW additive manufacturing apparatus of claim 2, wherein, The outer side of the additive spindle between the middle bearing seat and the lower bearing seat is provided with a cooling jacket, the upper end of the cooling jacket is fixedly connected with the middle bearing seat, the lower end of the cooling jacket is fixedly connected with the lower bearing seat, the inner wall of the cooling jacket is provided with an annular input transfer groove and an output transfer groove, one side of the input transfer groove is provided with a medium inlet, and one side of the output transfer groove is provided with a medium outlet.

6. The variable-radius wire-on-wire FSW additive manufacturing apparatus of claim 5, wherein, The cooling flow channel comprises at least one uplink flow channel parallel to the axis of the additive spindle and at least one downlink flow channel parallel to the axis of the additive spindle.

7. The variable-radius wire-on-wire FSW additive manufacturing apparatus of claim 1, wherein, The variable radius wire cutting tool comprises a connecting seat and a cutting part, the cutting part is fixedly connected to the upper side of the connecting seat, the connecting seat is connected to the upper end of the additive spindle, the cutting part is in a columnar shape, the cross section of the cutting part is in a involute shape with gradually decreasing radius from the outer blade part to the inner root part of the wire cutting blade, a material collecting hole is arranged above the connecting seat above the material dropping hole, and the wire cutting blade is located above the material collecting hole. The wire cutting blade is inclined from top to bottom and rearward at the cutting metal wire position.

8. The variable-radius wire-on-wire FSW additive manufacturing apparatus of claim 1, wherein, The stirring pressure head comprises a cylindrical pressure head body, a pressure head connecting seat is arranged on the outer side of the pressure head body, the pressure head connecting seat is connected with the lower end of the additive main shaft, the spiral groove is arranged on the outer side of the pressure head body below the pressure head connecting seat, the feeding channel is located in the pressure head body, and the feeding channel comprises a conical collecting hole, a circular falling hole and a spiral groove communication hole which are sequentially connected from top to bottom, the large inner diameter end of the conical collecting hole is connected with the lower end of the falling hole, the conical collecting hole and the circular falling hole are coaxial with the additive main shaft, and the upper end of the spiral groove communication hole is communicated with the lower end of the circular falling hole and the lower end is communicated with the upper part of the spiral groove.

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