Axial in-situ ultrasonic-assisted friction stir solid-phase additive manufacturing device and method

Abstract

The invention relates to the technical field of additive manufacturing of metal materials, and discloses an axial in-situ ultrasonic-assisted friction stir solid-phase additive manufacturing device and method. The device comprises a shaft tube and a rotating main shaft arranged in the shaft tube in a penetrating mode; the conical shaft sleeve is arranged at the bottom end of the shaft tube; the conical screw rod is arranged in the shaft sleeve and is connected with the rotating main shaft; a stirring needle is arranged at the bottom end of the conical screw rod; the ultrasonic mechanism is provided with an ultrasonic tool head abutting against the top end of the main shaft, and the feeding piece communicates with the conical shaft sleeve. The method comprises the steps that a shaft tube is moved, the size of an additive body and the thickness of an additive layer are preset, and a moving path is planned; starting an ultrasonic mechanism and driving a rotating main shaft to rotate, so that the materials are plasticized under the friction effect; the shaft tube is moved according to a planned path until material adding is finished; according to the device and method, the plasticizing efficiency of the material and the forming quality of the additive body can be improved, good combination between layers of the additive body is achieved, the forming precision and the equipment stability are guaranteed, and efficient and high-quality continuous additive manufacturing is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing of metal materials, and particularly relates to an axial in-situ ultrasonic-assisted friction stir solid-state additive manufacturing device and method. Background Art

[0002] Friction stir solid-state additive manufacturing technology generates heat through the high-speed rotation and friction of a specially designed tool head with the material, causing plastic deformation of the material, and repeatedly stacking the additive metal layer by layer along a predetermined path to finally obtain an additive component. This process does not involve the melting and solidification of the material, effectively avoiding defects such as pores and liquefaction cracks. At the same time, a fine equiaxed crystal structure can be obtained, improving the performance of the additive body. However, currently, the friction stir solid-state additive manufacturing technology has problems such as severe tool wear, large residual stress in the additive body, and weak interfacial bonding, thus affecting the overall strength and toughness of the part.

[0003] Therefore, in the prior art, introducing ultrasonic waves can often improve the plasticization efficiency of the material, reduce the residual stress in the additive body at the same time, and improve the additive quality. However, in the existing friction stir solid-state additive manufacturing devices with ultrasonic assistance, most can only achieve radial ultrasonic assistance. Radial addition will hinder the downward transportation of the raw material, and the inconsistent frequency direction of ultrasonic assistance with the axial direction will cause certain energy loss, weakening the ability of ultrasonic assistance to reduce the residual stress in the additive body. Summary of the Invention

[0004] The present invention provides an axial in-situ ultrasonic-assisted friction stir solid-state additive manufacturing device and method to solve the above deficiencies in the prior art. This device and method can avoid energy loss of ultrasonic assistance, improve the forming quality of the additive body, and achieve efficient and high-quality continuous additive manufacturing.

[0005] The technical solution of the present invention is: an axial in-situ ultrasonic-assisted friction stir solid-state additive manufacturing device and method, including a shaft tube and a rotating main shaft passing through the inside of the shaft tube. The device further includes: A conical shaft sleeve is arranged at the bottom end of the shaft tube; A conical screw is arranged inside the shaft sleeve. The conical screw is connected to the rotating main shaft, and a stirring pin is provided at the bottom end of the conical screw; An ultrasonic mechanism is arranged above the rotating main shaft. The ultrasonic mechanism has an ultrasonic tool head, and the ultrasonic tool head abuts against the top end of the rotating main shaft, and is used to transmit ultrasonic vibration to the material inside the conical shaft sleeve through the rotating main shaft and the conical screw, and further apply axial ultrasonic assistance to the additive body; A feeding member is communicated with the conical shaft sleeve, and the feeding member is used to continuously feed materials into the conical shaft sleeve.

[0006] In at least one embodiment of the present invention, the stirring pin is of a fin type.

[0007] In at least one embodiment of the present invention, a cooling ring is sleeved on the shaft tube, the bottom of the cooling ring is flush with the bottom of the shaft tube, and a coolant inlet and a coolant outlet are provided on the cooling ring.

[0008] In at least one embodiment of the present invention, the feeding member includes: a particle feeder or a wire feeder.

[0009] In at least one embodiment of the present invention, the particle feeder includes: A feed bin with a feed pipe provided on its side wall, and the feed pipe is inclined downward and communicated with a conical bushing; A vibrator is arranged at the bottom of the feed bin, and the vibrator is used to vibrate the materials in the feed bin so that the materials in the feed bin continuously enter the feed pipe.

[0010] In at least one embodiment of the present invention, the rotating main shaft is connected to a driving motor, and the driving motor, the wire feeder and the vibrator are all connected to a controller, and the controller is used to control the rotation speed of the driving motor, the vibration frequency of the vibrator and the feeding speed of the wire feeder.

[0011] The present invention also discloses an axial in-situ ultrasonic-assisted friction stir solid-state additive manufacturing method, which specifically includes the following steps: Move the shaft tube, preset the size of the additive body and the thickness of the additive layer, and plan the moving path; Start the ultrasonic mechanism and drive the rotating main shaft to rotate, so that the ultrasonic mechanism provides axial ultrasonic assistance during the additive manufacturing process through the ultrasonic tool head, and the rotating main shaft drives the conical screw to rotate; Open the feeding member and continuously feed materials into the conical bushing, so that the materials enter between the conical bushing and the conical screw and are plasticized under the friction action; Move the shaft tube along the planned path until the additive manufacturing is completed.

[0012] In at least one embodiment of the present invention, the frequency of the ultrasonic mechanism is 20 kHz, and the amplitude of the ultrasonic tool head is 25 μm - 50 μm.

[0013] In at least one embodiment of the present invention, the rotation speed of the rotating main shaft is 20 rpm - 2000 rpm, and the traveling speed in the traveling stage is 50 mm / min - 200 mm / min.

[0014] In at least one embodiment of the present invention, the form of the materials conveyed by the feeding member is powder, particles, debris or wire.

[0015] Compared with the prior art, the beneficial effects of the present invention: 1. The present invention is provided with a conical bushing, a conical screw, an ultrasonic mechanism with an ultrasonic tool head, and a feeding member communicating with the bushing. When the device is in use, the feeding member continuously conveys materials into the conical bushing from the side. During the rotation of the conical screw, the materials are gradually plasticized in the conical screw, and at the same time Since the ultrasonic tool head abuts against the top of the rotating main shaft, the ultrasonic mechanism applies axial ultrasonic assistance to the device during the additive manufacturing process, and further makes the ultrasonic assistance act on the additive body; compared with the prior art, since the ultrasonic assistance mechanism is arranged above the rotating main shaft, the ultrasonic assistance mechanism will not interfere with the feeding member during the operation of the device, and due to the conical design of both the screw and the bushing, the continuity of material transportation of the device is ensured, which helps the raw materials to be better transported downward in the additive manufacturing mechanism. The conical structure gradually narrows at the bottom, which can increase the extrusion effect on the raw materials, making them more uniform during the plasticization process, and enabling them to be fully plasticized under the action of the screw; moreover, the addition of axial ultrasound makes the energy utilization rate of the device high, and on this basis, it can accelerate the plasticized material, act on the additive layer, increase the interface bonding, refine the grains of the additive layer, and reduce the residual stress.

[0016] 2. The bottom of the conical screw is provided with fin-shaped stirring pins, which can realize the secondary plasticization of the materials, help improve the fluidity of the materials and the formability of the additive body, and at the same time promote the recrystallization of the additive body tissue to refine the grains, improve the bonding between layers of the additive body, avoid non-uniform properties between layers, and improve the overall mechanical properties of the materials.

[0017] 3. The device can realize the additive manufacturing of multi-scale raw materials. It can use raw materials of different sizes (powders, granules, debris, filaments, etc.) for additive manufacturing, improve the utilization rate of raw materials and process flexibility, increase the production speed and efficiency, and at the same time make the additive manufacturing process sustainable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the structure of the ultrasonic mechanism of the present invention.

[0020] Figure 3 It is a schematic diagram of the structure of the additive manufacturing mechanism of the present invention.

[0021] Figure 4 It is a schematic diagram of the structure of the feeding mechanism of the present invention.

[0022] Figure 5 It is a schematic diagram of the structure of the cooling ring of the present invention.

[0023] Figure 6 It is a macroscopic morphology and engineering stress-strain curve diagram of the additive body in the first embodiment of the present invention.

[0024] Figure 7 This is the macroscopic morphology and engineering stress-strain curve diagram of the additive body in the second embodiment of the present invention.

[0025] Explanation of reference numerals: 1. Shaft tube; 11. Rotating main shaft; 12. Driving motor; 2. Tapered bushing; 3. Tapered screw; 31. Stirring needle; 4. Ultrasonic mechanism; 41. Ultrasonic tool head; 42. Ultrasonic generator; 43. Amplitude transformer and transducer; 5. Feeding member; 51. Hopper; 511. Feeding pipe; 512. Air inlet; 513. Air outlet; 52. Vibrator; 53. Gas storage cylinder; 54. Pressure gauge; 6. Cooling ring; 61. Coolant inlet; 62. Coolant outlet; 7. Controller; 8. Additive body. Detailed implementation manners

[0026] The drawings in the present invention are not strictly drawn according to the actual ratio, and the specific sizes and quantities of each structure can be determined according to actual needs. The drawings described in the present invention are only schematic diagrams of the structure.

[0027] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0028] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art to which the present invention belongs. The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The terms such as "inside", "outside", "above", "below", "far", "near", "front", "rear", etc. are only used to represent relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0029] In the prior art, the plasticization efficiency of materials can often be improved by introducing ultrasound. At the same time, the residual stress of the additive body can be reduced, and the additive quality can be improved. However, in the prior art, most of the friction stir solid-state additive manufacturing devices with ultrasonic assistance can only achieve radial ultrasonic assistance. For example, in the patent with the publication number: CN112454021A, radial addition will hinder the downward transportation of raw materials. The frequency direction of ultrasonic assistance is inconsistent with the axial direction, causing certain energy loss. At the same time, the ultrasonic assistance device is fixed on the side of the additive equipment and is difficult to move with the stirring tool, which has certain limitations in the processing process.

[0030] In the present invention, the particle feeding mechanism can control the material flow through a vibrator, and introducing an inert gas can prevent the oxidation of raw materials. The wire feeding mechanism adjusts the feeding speed through a wire feeder; the ultrasonic mechanism provides ultrasonic assistance during the additive process through a transducer and a horn, and can plastify through axial ultrasonic assistance during the additive process, improving the plasticization efficiency of materials and the forming quality of the additive body; the additive structure controls the material flow and forming through a conical screw and a plasticizing bushing, and the fin-shaped stirring needle can achieve good bonding between layers of the additive body; the cooling mechanism avoids damage to the equipment caused by temperature during the additive process, ensuring the forming accuracy and equipment stability.

[0031] Combined Figures 1 to 5 As shown in the figure, an axial in-situ ultrasonic-assisted friction stir solid-state additive manufacturing device includes a shaft tube 1 and a rotating main shaft 11 inserted inside the shaft tube 1. The device further includes: A conical bushing 2 is arranged at the bottom end of the shaft tube 1, and the gap between the inside of the conical bushing 2 and the conical screw 3 is the plasticization space for materials; The conical screw 3 is arranged inside the bushing 2. The conical screw 3 is connected to the rotating main shaft 11, and a stirring needle 31 is provided at the bottom end of the conical screw 3; the conical screw 3 helps the material to be better transported downward inside the conical bushing 2, so that it is fully plasticized under the action of the screw rod, avoiding the situation of local non-plasticization or uneven plasticization; The ultrasonic mechanism 4 is arranged above the rotating main shaft 11. The ultrasonic mechanism 4 has an ultrasonic tool head 41, and the ultrasonic tool head 41 abuts against the top end of the rotating main shaft 11, and is used to transmit ultrasonic vibration to the material inside the conical bushing 2 through the rotating main shaft 11 and the conical screw 3, and then apply axial ultrasonic assistance to the additive body; specifically, the ultrasonic mechanism 4 is integrally composed of an ultrasonic generator 42, a horn and a transducer 43 and an ultrasonic tool head 41; during the ultrasonic action process, first the ultrasonic generator 42 converts the 220V alternating current signal into a 20 kHz digital vibration signal, the transducer 43 converts the electrical energy into the mechanical energy of ultrasonic vibration, then the amplitude is amplified through the horn, and finally it is transmitted to the rotating main shaft 11 through the ultrasonic tool head 41. The introduction of ultrasound can improve the plasticization efficiency of materials and reduce the residual stress inside the additive body; The feeding part 5 is communicated with the conical shaft sleeve 2, and the feeding part 5 is used for continuously feeding materials into the conical shaft sleeve 2.

[0032] As an alternative embodiment, the stirring pin 31 is in the shape of a fish fin; the stirring pin 31 can realize the secondary plasticization of the material, which helps to improve the material fluidity and the formability of the additive body. At the same time, it can promote the recrystallization of the additive body tissue to refine the grains, improve the bonding between layers of the additive body, avoid non-uniform properties between layers, and improve the overall mechanical properties of the material.

[0033] As an alternative embodiment, a cooling ring 6 is sleeved on the shaft tube 1. The bottom of the cooling ring 6 is flush with the bottom of the shaft tube 1. A coolant inlet 61 and a coolant outlet 62 are provided on the cooling ring 6. A cooler is connected to the coolant inlet 61 and the coolant outlet 62. The cooler is used to circulate a cooling medium into the cooling ring 6; specifically, by replacing different types of cooling media (water, liquid carbon dioxide, pentane, etc.), various cooling rates (0 °C / min to 500 °C / min) can be achieved to obtain different cooling effects. The introduction of the cooling system effectively avoids the damage of high temperature to the material and the equipment, and ensures the long-term stable operation of the equipment.

[0034] As an alternative embodiment, the feeding part 5 includes: a particle feeder or a wire feeder; specifically, the particle feeder and the wire feeder can be flexibly selected according to the selected material.

[0035] As an alternative embodiment, the particle feeder includes: a feed bin 51 and a vibrator 52. A feed pipe 511 is provided on the side wall of the feed bin 51. The feed pipe 511 is inclined downward and communicated with the conical shaft sleeve 2; the vibrator 52 is arranged at the bottom of the feed bin 51. The vibrator 52 is used to vibrate the materials in the feed bin 51 so that the materials in the feed bin 51 continuously enter the feed pipe 511; specifically, an air inlet 512 and an air outlet 513 are further provided on the feed bin 51. An inert gas storage cylinder 53 is communicated with the air outlet 513. A pressure gauge 54 is further provided on the feed bin 51. Introducing inert gas can prevent the raw materials from being oxidized, and the internal pressure of the feed bin 51 can be detected in real time through the pressure gauge 54. The vibrator 52 is fixed below the feed bin 51 for continuous feeding, and the feeding speed (20 g / min to 70 g / min) can be adjusted in real time, making the additive manufacturing process sustainable.

[0036] As an alternative embodiment, the rotating main shaft 11 is connected to a driving motor 12. The driving motor 12, the wire feeder and the vibrator 52 are all signal-connected to a controller 7. The controller 7 is used to control the rotation speed of the driving motor 12, the vibration frequency of the vibrator 52 and the feeding speed of the wire feeder.

[0037] The present invention also discloses an axial in-situ ultrasonic-assisted friction stir solid-state additive manufacturing method, which specifically includes the following steps: Move the shaft tube 1, preset the size of the additive body and the thickness of the additive layer, and plan the movement path; Start the ultrasonic mechanism 4 and drive the rotary main shaft 11 to rotate, so that the ultrasonic mechanism 4 drives the conical screw 3 to perform ultrasonic vibration through the ultrasonic tool head 41, and the rotary main shaft 11 drives the conical screw 3 to rotate; Turn on the vibrator 52 or the wire feeder. If the granular feeding mechanism is selected, open the hopper 51, add raw materials (powder, granules, debris, etc., with a granular size of 0.5 mm to 6 mm), and introduce a protective gas into the hopper 51 to prevent the raw materials from being oxidized. If the wire feeding mechanism (with a wire diameter of 0.5 mm to 6 mm) is selected, place the wire in the wire feeder, and use mechanical vibration or the wire feeder to start feeding, continuously conveying the material into the conical bushing 2 at a feeding speed of 20 g / min to 70 g / min, so that the material enters between the conical bushing 2 and the conical screw 3 and is plasticized under the action of friction; at the same time, continuously introduce a cooling medium into the cooling ring 6 to avoid damage to the material and equipment caused by high temperature and ensure the long-term stable operation of the equipment; Move the shaft tube 1 along the planned path until the additive manufacturing is completed.

[0038] As an alternative embodiment, the frequency of the ultrasonic mechanism 4 is 20 kHz, and the amplitude of the ultrasonic tool head 41 is 25 μm to 50 μm.

[0039] As an alternative embodiment, the rotational speed of the rotary main shaft 11 is 20 rpm to 2000 rpm, and the traveling speed during the traveling stage is 50 mm / min to 20 mm / min.

[0040] As an alternative embodiment, the form of the material conveyed by the feeding member 5 is powder, granules, debris or wire. Specifically, the length, width or diameter of the material is 0.5 mm to 6 mm, which enables additive manufacturing using raw materials of different sizes, improving the raw material utilization rate and process flexibility.

[0041] Specific embodiments of the present invention: Embodiment 1: Preset the size of the additive body (length 100 mm, width 18 mm) and the thickness of the additive layer (2.5 mm) by moving the position of the shaft tube 1, and plan the movement path; The raw material for this time is 6061 aluminum alloy wire with a diameter of 2.5 mm, so the wire feeding mechanism is selected; Turn on the wire feeder, control the feeding speed to be 35 g / min, at the same time introduce tap water into the cooling ring 6 with a cooling speed of 30 °C / min, and at the same time turn on the ultrasonic mechanism 4. The vibration frequency of the ultrasonic mechanism 4 is 20 kHz, the amplitude is 30 μm, and the maximum power is 500 W; Start the rotating main shaft 11 at a rotational speed of 600 rpm, and let the raw material enter the high-speed rotating conical screw 3 to rub against the conical bushing 2 and undergo plasticization; after the material is plasticized, the device starts additive manufacturing according to the planned movement path at a traveling speed of 120 mm / min until the program ends.

[0042] Figure 6 It is the macro-morphology and engineering stress-strain curve diagram of the additive manufactured body in this embodiment. The macro-forming is good without obvious defects.

[0043] Example 2: Preset the size of the additive manufactured body (length 100 mm, width 18 mm) and the thickness of the additive layer (2 mm) by moving the position of the shaft tube 1, and plan the movement path; The raw materials are 6061 and 2024 aluminum alloy mixed particles with a particle size of 3 mm to 5 mm. The mixed particles are processed in a ball mill for 1 hour at a rotational speed of 300 rpm. The mixed particles are put into the feed bin 51. Since aluminum alloy particles are not easily oxidized, there is no need to introduce a protective gas into the feed bin 51 to avoid wasting resources; Turn on the vibrator 42 and start continuous feeding using mechanical vibration. Control the feeding speed at 40 g / min by controlling the vibration frequency. At the same time, introduce liquid carbon dioxide into the cooling ring 6 at a cooling speed of 100 °C / min. At the same time, turn on the ultrasonic mechanism 4. The vibration frequency of the ultrasonic mechanism 4 is 20 kHz, the amplitude is 30 μm, and the maximum power is 500 W; Start the rotating main shaft 11 at a rotational speed of 1200 rpm, and let the raw material enter the high-speed rotating conical screw 3 to rub against the conical bushing 2 and undergo plasticization; after the material is plasticized, the device starts additive manufacturing according to the planned movement path at a traveling speed of 150 mm / min until the program ends.

[0044] Figure 7 It is the macro-morphology and engineering stress-strain curve diagram of the additive manufactured body in this embodiment. The macro-forming is good without obvious defects, and the strength is better than that of the additive manufactured body in Example 1.

[0045] The above embodiments are only specific implementation manners of the present invention, used to illustrate the technical solutions of the present invention, rather than limiting it. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: any person skilled in the art within the technical scope disclosed by the present invention can still modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions implemented by the present invention, and should all be covered within the protection scope of the present invention.

Claims

1. An axial in-situ ultrasonic-assisted friction stir solid-state additive manufacturing device, comprising a shaft tube (1) and a rotating main shaft (11) disposed inside the shaft tube (1), characterized in that, The device further includes: A conical bushing (2), arranged at the bottom end of the shaft tube (1); A conical screw (3), arranged inside the bushing (2), the conical screw (3) is connected to the rotating main shaft (11), and a stirring needle (31) is provided at the bottom end of the conical screw (3); An ultrasonic mechanism (4), arranged above the rotating main shaft (11), the ultrasonic mechanism (4) has an ultrasonic tool head (41), and the ultrasonic tool head (41) abuts against the top end of the rotating main shaft (11), and is used to transmit ultrasonic vibration to the material inside the conical bushing (2) through the rotating main shaft (11) and the conical screw (3), so as to apply axial ultrasonic assistance to the additive body; A feeding member (5), communicated with the conical bushing (2), and the feeding member (5) is used to continuously feed materials into the conical bushing (2).

2. The axial in-situ ultrasonic-assisted friction stir solid-state additive manufacturing device according to claim 1, wherein The stirring needle (31) is of a fin shape.

3. The axial in-situ ultrasonic-assisted friction stir solid-state additive manufacturing device according to claim 1, wherein The feeding member (5) includes: a particle feeder or a wire feeder.

4. The axial in-situ ultrasonic-assisted friction stir solid-state additive manufacturing device according to claim 3, characterized in that, The particle feeder includes: A material bin (51), a feeding pipe (511) is arranged on its side wall, and the feeding pipe (511) is inclined downward and communicated with the conical bushing (2); A vibrator (52), arranged at the bottom of the material bin (51), and is used to vibrate the material in the material bin (51) so that the material in the material bin (51) continuously enters the feeding pipe (511).

5. An in-situ axial ultrasonic-assisted friction stir solid-state additive manufacturing device according to claim 4, characterized in that, The rotating main shaft (11) is connected with a driving motor (12), and the driving motor (12), the wire feeder and the vibrator (52) are all signal-connected to a controller (7), and the controller (7) is used to control the rotation speed of the driving motor (12), the vibration frequency of the vibrator (52) and the feeding speed of the wire feeder.

6. The axial in-situ ultrasonic-assisted friction stir solid-state additive manufacturing device according to claim 1, wherein, A cooling ring (6) is sleeved on the shaft tube (1), the bottom of the cooling ring (6) is flush with the bottom of the shaft tube (1), a coolant inlet (61) and a coolant outlet (62) are opened on the cooling ring (6), and a cooler is connected to the coolant inlet (61) and the coolant outlet (62).

7. An axial in-situ ultrasonic-assisted friction stir solid-state additive manufacturing method, based on the axial in-situ ultrasonic-assisted friction stir solid-state additive manufacturing device described in claim 1, characterized in that, Including the following steps: Preset the size of the additive body and the thickness of the additive layer, and plan the moving path; Start the ultrasonic mechanism (4) and drive the rotating main shaft (11) to rotate, so that the ultrasonic mechanism (4) provides axial ultrasonic assistance during the additive process through the ultrasonic tool head (41), and the rotating main shaft (11) drives the conical screw (3) to rotate; Open the feeding member (5) and continuously feed materials into the conical bushing (2) so that the materials enter between the conical bushing (2) and the conical screw (3) and are plasticized under the action of friction; Move the shaft tube (1) along the planned path until the additive process ends.

8. The axial in-situ ultrasonic-assisted friction stir solid state additive manufacturing method according to claim 7, characterized in that, The frequency of the ultrasonic mechanism (4) is 20 kHz, and the amplitude of the ultrasonic tool head (41) is 25 μm - 50 μm.

9. The axial in-situ ultrasonic-assisted friction stir solid-state additive manufacturing method according to claim 7, characterized in that, The rotation speed of the rotating main shaft (11) is 20 rpm - 2000 rpm, and the traveling speed during the traveling stage is 50 mm / min - 200 mm / min.

10. A method for axial in-situ ultrasonic-assisted friction stir solid-state additive manufacturing according to claim 7, characterized in that, The form of the material conveyed by the feeding member (5) is powder, particle, debris or wire.

Images