Additive manufacturing forming device and forming method with stirring friction assisted by rotary vibration

Abstract

The invention relates to the technical field of additive manufacturing, in particular to an additive manufacturing forming device and method with stirring friction assisted by rotary vibration, and the additive manufacturing forming device with stirring friction assisted by rotary vibration comprises a workbench assembly, a rotary vibration assembly arranged on one side of the workbench assembly, and a feeding system used for providing raw materials; the workbench assembly and the rotary vibration assembly can move relatively. According to the method, by means of the acoustic softening effect of in-situ coupling of rotary vibration with stirring friction assisted by rotary vibration, the thermal effect of stirring friction and the extrusion shearing effect, plastic rheology in the material forming process can be effectively promoted, the forming stress and temperature are reduced, the interlayer binding force is improved, and the mechanical property of the material is improved; and deposition and stacking of metal materials, high polymer materials, biological materials, composite materials and other raw materials in the forms of bars, strips, wires, powder, fluid and the like can be efficiently achieved, and multiple structures can be formed through a certain path in an additive forming mode.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and in particular to a rotary vibration assisted friction stir additive manufacturing forming device and forming method. Background Art

[0002] Additive manufacturing technology is to deposit or stack raw materials along a planned path to form the designed structural parts, which can not only reduce material waste, but also greatly shorten the development space of new products. Due to its high efficiency and flexibility, it has been widely used in the manufacture of structural parts in the fields of automobiles, ships, aviation, aerospace, biomedicine, etc., and still has great application prospects in the industry.

[0003] At present, the most commonly used additive manufacturing technologies are melt deposition under the action of laser, arc, electron beam, ion beam, hot extrusion stacking, photocuring, etc. In recent years, the industry has begun to explore the application of stir friction technology in additive manufacturing. As a solid phase deposition technology, it does not involve the melting and solidification process of materials, thereby greatly reducing additive manufacturing defects and effectively improving the mechanical properties of additive manufacturing structural parts. However, most of the current stir friction additive manufacturing technologies only deposit materials through friction, extrusion, and shearing. The stress and temperature required in the contact area are high, which restricts the promotion and application of this technology.

[0004] CN116944661A discloses a friction stir additive manufacturing device based on ultrasonic vibration assistance, and CN115647563A discloses a follow-up hammer-type friction stir additive manufacturing device and method. Its ultrasonic vibration device does not perform rotational motion, nor is it directly connected to the stirring head or rod material, and cannot achieve in-situ coupling of the rotation and vibration of the stirring head or rod material; at the same time, it is assisted by ultrasonic vibration, and does not cover the vibration frequency and vibration mode other than ultrasonic vibration; in addition, its feeding method does not have the assistance of vibration separation. CN117754108A discloses a method for manufacturing metal-based composite materials based on friction stir additives, and CN110587166A discloses an ultrasonic consolidation-friction stir composite additive manufacturing device and method of use, both of which mention the application of ultrasonic vibration assistance, but the friction stir effect and ultrasonic vibration effect are applied in sequence, and the friction stir effect and vibration assistance effect cannot be coupled simultaneously.

[0005] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a rotational vibration assisted stir friction additive manufacturing forming device and forming method, aiming to solve the problems of high stress and high temperature required in the contact area of ​​the existing additive manufacturing forming device.

[0007] The technical solution of the present invention is as follows:

[0008] A rotary vibration assisted friction stir additive manufacturing forming device comprises: a workbench assembly, a rotary vibration assembly arranged on one side of the workbench assembly, and a feeding system for providing raw materials; the workbench assembly and the rotary vibration assembly can move relative to each other;

[0009] The rotary vibration assembly includes: a main shaft for generating a rotary motion, a vibration unit arranged on a side of the main shaft close to the workbench assembly, and a stirring head or a material bar arranged on a side of the vibration unit away from the main shaft.

[0010] The rotary vibration assisted friction stir additive manufacturing forming device, wherein the rotary vibration assisted friction stir additive manufacturing forming device also includes an atmosphere chamber; the workbench assembly, the rotary vibration assembly and the feeding system are all arranged in the atmosphere chamber; the feeding system provides raw materials through a feeding pipe.

[0011] The rotary vibration assisted stir friction additive manufacturing forming device, wherein the atmosphere chamber is provided with an air extraction and inflation device; and the rotary vibration component is connected to a power module.

[0012] The rotary vibration assisted friction stir additive manufacturing forming device, wherein the workbench assembly includes a workbench, a substrate arranged on the side of the workbench close to the rotary vibration assembly, and a temperature control system for controlling the temperature of the substrate.

[0013] The rotary vibration assisted friction stir additive manufacturing forming device, wherein the workbench is provided with a first dynamic force sensor and a first displacement sensor; and a motion track is provided on the side of the workbench away from the substrate.

[0014] The rotational vibration assisted friction stir additive manufacturing forming device, wherein the main shaft is provided with a second dynamic force sensor and a second displacement sensor.

[0015] The rotary vibration assisted friction stir additive manufacturing forming device, wherein the side of the main shaft close to the workbench assembly is also provided with a shell and a seal arranged on the side of the shell away from the main shaft; the vibration unit, and the stirring head or material rod are all arranged in the shell; the seal is provided with a stirring vibration port, and the stirring head or material rod passes through the stirring vibration port to contact the workbench assembly.

[0016] The rotary vibration assisted friction stir additive manufacturing forming device, wherein the vibration unit includes a vibration system connected to the main shaft, and an excitation module connected to the vibration system; the stirring head or material rod is connected to the excitation module.

[0017] The rotary vibration assisted friction stir additive manufacturing forming device, wherein the excitation form of the excitation module includes one of a piezoelectric transducer, an electromagnetic drive, and a cam mechanism; the vibration mode of the excitation module includes one of longitudinal vibration, bending vibration, torsional vibration, and three-dimensional vibration.

[0018] A forming method of an additive manufacturing forming device based on a rotational vibration assisted stir friction, comprising the steps of:

[0019] Setting the vibration frequency and amplitude as well as the speed of the rotating vibration component;

[0020] Set the plane movement speed and path of the workbench assembly, and set the feeding speed of the feeding system;

[0021] The raw material is conveyed to the gap between the stirring head and the rotary vibration component by utilizing the feeding system, and deposited in the stirring friction zone between the stirring head and the worktable component to complete additive manufacturing to form a structural part; or, the raw material is completed by coupling the rotary vibration and stirring friction between the material bar and the worktable component to form a structural part by additive manufacturing.

[0022] Beneficial effects: The present invention provides a rotary vibration assisted friction stir additive manufacturing forming device and forming method, the rotary vibration assisted friction stir additive manufacturing forming device comprises: a workbench assembly, a rotary vibration assembly arranged on one side of the workbench assembly, and a feeding system for providing raw materials; the workbench assembly and the rotary vibration assembly can move relative to each other; the rotary vibration assembly comprises: a main shaft for generating rotary movement, a vibration unit arranged on the side of the main shaft close to the workbench assembly, and a stirring head or material bar arranged on the side of the vibration unit away from the main shaft. The present invention utilizes the acoustic softening effect of rotary vibration assisted friction stir in situ coupling, the thermal effect of friction stir and the extrusion shearing effect, which can effectively promote the plastic rheology in the material forming process, reduce the forming stress and temperature, enhance the interlayer bonding force, improve the mechanical properties of the material, and can efficiently realize the deposition and stacking of raw materials such as metal materials, polymer materials, biomaterials, composite materials, etc. in the form of bars, strips, wires, powders, fluids, etc., and can be additively formed into various structures through a certain path. In addition, the device can adjust the vibration mode, frequency, amplitude and stirring friction parameters according to different material properties and forming requirements, so as to effectively control the force, heat and rheological properties of the material additive manufacturing process; at the same time, the device has a vibration-assisted efficient and accurate feeding scheme, which produces an instantaneous vibration separation effect in the stirring friction area, allowing the feeding system to effectively supply raw materials to the contact area of ​​stirring friction, overcoming the feeding problem of closed / semi-closed stirring friction areas. The device and method have high additive manufacturing efficiency, good process flexibility, no dust, energy saving and environmental protection, and can achieve low-defect, high-performance additive manufacturing of different material forms and structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a rotational vibration assisted friction stir additive manufacturing forming device of the present invention;

[0024] Figure 2 The material compression deformation characteristic data diagram of Example 1 without vibration assistance and with vibration assistance;

[0025] Explanation of the accompanying drawings: workbench assembly 10, workbench 11, first dynamic force sensor 111, motion track 112, substrate 12, rotational vibration assembly 20, spindle 21, second dynamic force sensor 211, vibration unit 22, vibration system 221, excitation module 222, stirring head or material rod 23, power module 24, feeding system 30, feeding pipeline 31, atmosphere chamber 40, vacuum and inflation device 41, shell 50, seal 60, stirring vibration port 61, vibration separation zone 611, stirring friction zone 612. DETAILED DESCRIPTION

[0026] The present invention provides a rotary vibration assisted stir friction additive manufacturing forming device and forming method. In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as herein.

[0028] like Figure 1 As shown, the present invention provides a rotary vibration assisted stir friction additive manufacturing forming device, comprising: a workbench assembly 10, a rotary vibration assembly 20 arranged on one side of the workbench assembly 10, and a feeding system 30 for providing raw materials; the workbench assembly 10 and the rotary vibration assembly 20 can move relative to each other;

[0029] The rotary vibration assembly 20 includes: a main shaft 21 for generating a rotary motion, a vibration unit 22 disposed on a side of the main shaft 21 close to the workbench assembly 10 , and a stirring head or a material bar 23 disposed on a side of the vibration unit 22 away from the main shaft 21 .

[0030] In this embodiment, the use of rotary vibration to assist the stir friction in situ coupling of the acoustic softening effect of rotary vibration, the thermal effect of stir friction and the extrusion shearing effect can effectively promote the plastic rheology in the material forming process, reduce the forming stress and temperature, enhance the interlayer bonding force, improve the mechanical properties of the material, and efficiently realize the deposition and stacking of raw materials such as metal materials, polymer materials, biomaterials, composite materials in the form of bars, strips, wires, powders, fluids, etc., and can achieve additive forming of various structures through a certain path. In addition, the device can adjust the vibration mode, frequency, amplitude and stir friction parameters according to different material properties and forming requirements, so as to effectively control the force, heat and rheological characteristics of the material additive manufacturing process; at the same time, the device has a vibration-assisted efficient and accurate feeding scheme, which produces an instantaneous vibration separation effect in the stir friction area, so that the feeding system can effectively supply the raw materials to the contact area of ​​the stir friction, overcoming the feeding problem of the closed / semi-closed stir friction area. The device and method have high additive manufacturing efficiency, good process flexibility, no dust, energy saving and environmental protection, and can realize low-defect and high-performance additive manufacturing of different material forms and structures.

[0031] Specifically, the present invention arranges the vibration unit 22 on the main shaft 21, and the stirring head or material rod 23 is arranged on the vibration unit 22. The main shaft 21 is driven by a motor to provide a rotation speed and torque for the device. The vibration unit 22 is driven to rotate together through the main shaft 21, and vibrations covering but not limited to low frequency (≤5kHz), high frequency (5kHz-20kHz), ultrasonic frequency (≥20kHz) and the like are generated at the same time, thereby generating multiple coupling effects such as acoustic plasticity, thermal softening, and hot extrusion shear, significantly promoting the combination of plastic rheology and deposition of materials, thereby realizing high-performance additive manufacturing. Applicable materials include but are not limited to metal materials, polymer materials, biomaterials, composite materials, etc., and the forms of raw materials include but are not limited to rods, strips, wires, powders, fluids, etc.

[0032] At the same time, the present invention proposes to use the instantaneous separation gap generated by the axial vibration of the stirring head or the bar material to accurately transport the raw material to the closed / semi-closed stirring friction area. In addition, when the bar material is used as the raw material, the material bar material is installed on the vibration unit 22, and under the coupling effect of the rotational vibration and stirring friction, the material bar material is directly softened and deposited on the substrate of the workbench assembly; when strips, wires, powders, fluids, etc. are used as raw materials, the feeding system 30 transports the raw materials to the stirring friction area on the workbench assembly, thereby realizing material deposition and coating.

[0033] In some embodiments, the rotary vibration assisted friction stir additive manufacturing forming device further includes an atmosphere chamber 40; the workbench assembly 10, the rotary vibration assembly 20 and the feeding system 30 are all arranged in the atmosphere chamber 40; the feeding system 30 provides raw materials through a feeding pipe 31. By setting the atmosphere chamber 40, the content of nitrogen, argon, oxygen and other gases in the atmosphere chamber can be adjusted by gas replacement, vacuuming and other methods according to the environmental requirements in the additive manufacturing process, the atmosphere environment and humidity of the additive manufacturing process can be controlled, and the additive manufacturing forming quality of different materials can be ensured.

[0034] In some embodiments, the atmosphere chamber 40 may be filled with, but not limited to, nitrogen, argon, oxygen or other gases, or may be a vacuum.

[0035] In some embodiments, the atmosphere chamber 40 is provided with an air pumping and filling device 41; the rotary vibration component 20 is connected to a power module 24. The air pumping and filling device 41 can be used to adjust the gas content in the atmosphere chamber or to evacuate the atmosphere, control the atmosphere and humidity during the additive manufacturing process, and ensure the additive manufacturing quality of different materials. The power module 24 can be used to provide power for the rotary vibration component 20, and the power module supplies power to the rotating vibration unit in the form of a brush or wireless power supply.

[0036] Specifically, the power module includes a power supply system and a power switch component.

[0037] In some embodiments, the workbench assembly 10 includes a workbench 11 , a substrate 12 disposed on a side of the workbench 11 close to the rotation and vibration assembly 20 , and a temperature control system for controlling the temperature of the substrate 12 .

[0038] In some embodiments, the temperature control system includes a temperature sensor and a temperature control element, etc. The temperature of the substrate is fed back in real time by the temperature sensor, and the temperature control element can be used to adjust the surface temperature of the substrate in real time. Preferably, the temperature control system and the substrate 12 are integrated to improve the sensitivity of temperature feedback and temperature regulation.

[0039] In some embodiments, the workbench 11 is provided with a first dynamic force sensor 111 and a first displacement sensor; a motion track 112 is provided on the side of the workbench 11 away from the substrate 12. The motion track 112 enables the workbench assembly to move along a set trajectory.

[0040] In some embodiments, a second dynamic force sensor 211 and a second displacement sensor are provided on the spindle 21. By providing the first dynamic force sensor 111 and the first displacement sensor on the workbench and providing the second dynamic force sensor 211 and the second displacement sensor on the spindle 21, and combining the motion track 112, the feed speed of the spindle and the workbench can be automatically adjusted in real time according to the set load or displacement.

[0041] Specifically, the temperature of the substrate is adjusted (for example, -50°C to 300°C) according to the softening temperature or modification temperature of the printed material; at the same time, the spindle and worktable assembly automatically adjust the displacement and speed according to the changes in the normal force, tangential force, and torque during the additive manufacturing process to achieve constant load feeding or constant displacement feeding in the stir friction area; according to the set additive manufacturing path, the worktable assembly and the spindle are linked to ensure that the stir friction area is deposited according to the planned path, size, and angle.

[0042] In some embodiments, the side of the spindle 21 close to the workbench assembly 10 is further provided with a housing 50 and a seal 60 disposed on the side of the housing 50 away from the spindle 21; the vibration unit 22 and the stirring head or material bar 23 are all disposed in the housing 50; the seal 60 is provided with a stirring vibration port 61, and the stirring head or material bar 23 passes through the stirring vibration port 61 to contact the workbench assembly 10. The seal 60 can be used to constrain the feeding area of ​​the stirring friction zone.

[0043] Specifically, the stirring vibration port 61 includes a vibration separation zone 611 and a stirring friction zone 612. The device is used to generate vibration in the stirring friction zone, so that an instantaneous separation gap is generated in the closed stirring friction contact area between the stirring head and the substrate, so that raw materials such as strips, wires, powders, and fluids can be efficiently and accurately supplied to the stirring friction area, thereby realizing efficient and accurate feeding of closed / semi-closed stirring friction areas.

[0044] In some embodiments, the vibration unit 22 includes a vibration system 221 connected to the main shaft 21 , and an excitation module 222 connected to the vibration system 221 ; the stirring head or material rod 23 is connected to the excitation module 222 .

[0045] Specifically, the vibration unit is installed on the main shaft and is driven to rotate by the main shaft. The stirring head or material bar is installed at the front end of the vibration unit by clamping or the like. While rotating with the vibration unit, it vibrates at the vibration frequency, amplitude and vibration mode generated by the excitation module.

[0046] In some embodiments, the excitation form of the excitation module includes but is not limited to one of a piezoelectric transducer, an electromagnetic drive, and a cam mechanism; the vibration mode of the excitation module includes but is not limited to one of longitudinal vibration, bending vibration, torsional vibration, and three-dimensional vibration.

[0047] Specifically, the vibration frequency of the excitation module covers but is not limited to low frequency (≤5kHz), high frequency (5kHz-20kHz), ultrasonic frequency (≥20kHz), etc., and the amplitude is adjustable from zero to the maximum value; the vibration unit is installed on the main shaft and driven by the main shaft to rotate, and the stirring head or material bar is installed on the front section of the excitation module by means of holding, etc., and while rotating with the rotary vibration system, it vibrates at the vibration frequency, amplitude and vibration mode generated by the excitation module as described above, and the feeding system supplies raw materials such as strips, wires, powders, and fluids to the stirring friction area through transportation methods such as pneumatic conveying and screw conveying with the assistance of vibration; raw materials such as material bars, strips, wires, powders, and fluids are deposited on the substrate through the above rotary vibration assisted stirring friction device.

[0048] Specifically, a stirring head or a material rod to be deposited is installed according to the vibration frequency, amplitude and mode; a vibration unit is installed on the main shaft, and the stirring head or material rod installed on the vibration unit is driven to rotate at an adjustable speed, and at the same time, the stirring head or material rod is driven to vibrate in different vibration modes (for example: longitudinal vibration, bending vibration, torsional vibration, etc.), and loaded into the stirring friction area on the substrate with a certain positive pressure. At the same time, the feeding system delivers raw materials such as strips, wires, powders, and fluids to the stirring friction area for deposition, thereby realizing the in-situ coupling of rotational vibration and stirring friction in the additive manufacturing process.

[0049] For example, for aluminum alloy and its composite materials, the vibration frequency is set to 20kHz-40kHz, the amplitude is 5-60μm; at the same time, the speed of the main shaft driving the vibration system and the stirring head to rotate is set to 100-1000rpm; the plane movement speed and path of the workbench are set, for example: reciprocating at a speed of 1-10mm / s; and the feeding speed of the feeding system is set to 10-100mm 3 / min.

[0050] The above-mentioned rotary vibration-assisted stir friction additive manufacturing forming device is adopted, and the stirring head or the material rod to be deposited is installed according to the vibration frequency, amplitude and mode of the vibration unit; the vibration unit is installed on the main shaft, and drives the stirring head or the material rod to rotate at an adjustable speed (for example: 100-1000rpm), and at the same time drives the stirring head or the material rod to vibrate in different vibration modes (for example: longitudinal vibration, bending vibration, torsional vibration, etc.), and loads it to the stir friction area on the substrate with a certain positive pressure (for example: 50-500N), and at the same time, the feeding system delivers raw materials such as strips, wires, powders, fluids, etc. to the stir friction area for deposition, thereby realizing the in-situ coupling of rotary vibration and stir friction in the additive manufacturing process.

[0051] In addition, the present invention also provides a forming method of an additive manufacturing forming device based on a rotational vibration assisted stir friction, comprising the steps of:

[0052] Step S10: setting the vibration frequency, amplitude and rotation speed of the rotating vibration component;

[0053] Step S20: setting the plane movement speed and path of the workbench assembly, and setting the feeding speed of the feeding system;

[0054] Step S30: using the feeding system to convey the raw material to the gap between the stirring head and the rotary vibration assembly, depositing it through the stirring friction zone between the stirring head and the workbench assembly to complete additive manufacturing to form a structural part; or, completing additive manufacturing to form a structural part through the coupling of rotary vibration and stirring friction between the material bar and the workbench assembly.

[0055] In this embodiment, the use of rotary vibration to assist the stir friction in situ coupling of the acoustic softening effect of rotary vibration, the thermal effect of stir friction and the extrusion shearing effect can effectively promote the plastic rheology in the material forming process, reduce the forming stress and temperature, enhance the interlayer bonding force, improve the mechanical properties of the material, and efficiently realize the deposition and stacking of raw materials such as metal materials, polymer materials, biomaterials, composite materials in the form of bars, strips, wires, powders, fluids, etc., and can achieve additive forming of various structures through a certain path. In addition, the device can adjust the vibration mode, frequency, amplitude and stir friction parameters according to different material properties and forming requirements, so as to effectively control the force, heat and rheological characteristics of the material additive manufacturing process; at the same time, the device has a vibration-assisted efficient and accurate feeding scheme, which produces an instantaneous vibration separation effect in the stir friction area, so that the feeding system can effectively supply the raw materials to the contact area of ​​the stir friction, overcoming the feeding problem of the closed / semi-closed stir friction area. The device and its method have high additive manufacturing efficiency, good process flexibility, no dust, energy saving and environmental protection, and can realize low-defect and high-performance additive manufacturing of different material forms and structures.

[0056] The following examples are further given to illustrate the present invention in detail. It should also be understood that the following examples are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present invention belong to the scope of protection of the present invention.

[0057] Example 1

[0058] Taking the additive manufacturing of 6061 aluminum alloy and its composite materials as an example, the vibration unit is installed on the main shaft by fastening methods such as pins or screws. Figure 1 As shown, the stirring head or material bar is mounted on the excitation module of the vibration system by clamping or the like, and the power supply supplies power to the rotating vibration system by means of brushes or wireless power supply. A rubber seal is mounted on the housing to constrain the feeding area of ​​the stirring friction zone.

[0059] The acoustic softening effect of 6061 aluminum alloy and its composite materials under vibration was tested to obtain appropriate vibration auxiliary parameters. For example, under the vibration loading of 20kHz and 60μm amplitude, aluminum alloy and composite materials containing different volume percentages of SiC particles (20%, 30%, 45% SiCp / Al) showed different acoustic softening characteristics, such as Figure 2 As shown in the figure, compared with the compression test without vibration assistance, the deformation stress of aluminum alloy and its composite materials is reduced by about 90% under the assistance of high-frequency vibration. At the same time, under the assistance of high-frequency vibration, no cracks are generated in the compressed samples, and the plastic limit is increased by about 1 times.

[0060] Specifically, the gas filling and exhaust device is started. When the oxygen content in the atmosphere chamber drops to 100-500ppm, the substrate temperature control system is started to increase the substrate temperature and stabilize it at 200℃. The normal force target value of the force sensor of the spindle and the substrate is set to 100N. The spindle is controlled by closed loop to adjust the upper and lower spindle displacements in real time, and the normal force between the stirring head and the substrate is stably controlled at 100N. Then the spindle rotation and vibration system power supply is started, and the stirring head begins to rotate and vibrate at the set speed of 600rpm and vibration parameters (frequency 30kHz, amplitude 40μm).

[0061] In summary, the present invention provides a rotary vibration assisted stir friction additive manufacturing forming device and forming method, the rotary vibration assisted stir friction additive manufacturing forming device comprises: a workbench assembly, a rotary vibration assembly arranged on one side of the workbench assembly, and a feeding system for providing raw materials; the workbench assembly and the rotary vibration assembly can move relative to each other; the rotary vibration assembly comprises: a main shaft for generating rotary movement, a vibration unit arranged on the side of the main shaft close to the workbench assembly, and a stirring head or material rod arranged on the side of the vibration unit away from the main shaft. The present invention utilizes the acoustic softening effect of rotary vibration assisted stir friction in-situ coupling rotary vibration, the thermal effect of stir friction and the extrusion shearing effect, which can effectively promote plastic rheology in the material forming process, reduce forming stress and temperature, enhance interlayer bonding force, improve material mechanical properties, and can efficiently realize the deposition and stacking of raw materials such as metal materials, polymer materials, biomaterials, composite materials, etc. in the form of bars, strips, wires, powders, fluids, etc., and can achieve additive forming of various structures through a certain path. In addition, the device can adjust the vibration mode, frequency, amplitude and stirring friction parameters according to different material properties and forming requirements, so as to effectively control the force, heat and rheological properties of the material additive manufacturing process; at the same time, the device has a vibration-assisted efficient and accurate feeding scheme, which produces an instantaneous vibration separation effect in the stirring friction area, allowing the feeding system to effectively supply raw materials to the contact area of ​​stirring friction, overcoming the feeding problem of closed / semi-closed stirring friction areas. The device and method have high additive manufacturing efficiency, good process flexibility, no dust, energy saving and environmental protection, and can achieve low-defect, high-performance additive manufacturing of different material forms and structures.

[0062] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A rotary vibration assisted friction stir additive manufacturing forming device, characterized in that: include: A workbench assembly, a rotary vibration assembly disposed on one side of the workbench assembly, and a feeding system for providing raw materials; The workbench assembly and the rotary vibration assembly can move relative to each other; The rotary vibration assembly includes: a main shaft for generating a rotary motion, a vibration unit arranged on a side of the main shaft close to the workbench assembly, and a stirring head or a material bar arranged on a side of the vibration unit away from the main shaft.

2. The rotary vibration assisted friction stir additive manufacturing forming device according to claim 1, characterized in that: The rotary vibration assisted friction stir additive manufacturing forming device also includes an atmosphere chamber; the workbench assembly, the rotary vibration assembly and the feeding system are all arranged in the atmosphere chamber; the feeding system provides raw materials through a feeding pipeline.

3. The rotary vibration assisted friction stir additive manufacturing forming device according to claim 2, characterized in that: The atmosphere chamber is provided with an air extraction and inflation device; the rotary vibration component is connected with a power supply module.

4. The rotary vibration assisted friction stir additive manufacturing forming device according to claim 1, characterized in that: The workbench assembly comprises a workbench, a substrate arranged on a side of the workbench close to the rotation and vibration assembly, and a temperature control system for controlling the temperature of the substrate.

5. The rotary vibration assisted friction stir additive manufacturing forming device according to claim 4, characterized in that: A first dynamic force sensor and a first displacement sensor are arranged on the workbench; and a motion track is arranged on a side of the workbench away from the substrate.

6. The rotary vibration assisted friction stir additive manufacturing forming device according to claim 1, characterized in that: The main shaft is provided with a second dynamic force sensor and a second displacement sensor.

7. The rotary vibration assisted friction stir additive manufacturing forming device according to claim 1, characterized in that: A shell and a seal are provided on the side of the main shaft close to the workbench assembly; the vibration unit and the stirring head or material rod are all arranged in the shell; the seal is provided with a stirring vibration port, and the stirring head or material rod contacts the workbench assembly through the stirring vibration port.

8. The rotary vibration assisted friction stir additive manufacturing forming device according to claim 7, characterized in that: The vibration unit includes a vibration system connected to the main shaft, and an excitation module connected to the vibration system; the stirring head or the material bar is connected to the excitation module.

9. The rotary vibration assisted friction stir additive manufacturing forming device according to claim 8, characterized in that: The excitation form of the excitation module includes one of a piezoelectric transducer, an electromagnetic drive, and a cam mechanism; the vibration mode of the excitation module includes one of a longitudinal vibration, a bending vibration, a torsional vibration, and a three-dimensional vibration.

10. A forming method based on the rotary vibration assisted friction stir additive manufacturing forming device according to any one of claims 1 to 9, characterized in that: Includes steps: Setting the vibration frequency and amplitude as well as the speed of the rotating vibration component; Set the plane movement speed and path of the workbench assembly, and set the feeding speed of the feeding system; The raw material is conveyed to the gap between the stirring head and the rotary vibration component by utilizing the feeding system, and deposited in the stirring friction zone between the stirring head and the worktable component to complete additive manufacturing to form a structural part; or, the raw material is completed by coupling the rotary vibration and stirring friction between the material bar and the worktable component to form a structural part by additive manufacturing.

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