Apparatus and method for acoustic assisted manufacturing of micro-particle composites based on acoustic holography

Abstract

The application discloses a kind of based on the acoustic holography technology's microparticle composite material sound auxiliary manufacturing device and method.Acoustic control module and mixed liquid container lifting mechanism are fixed in water tank inner bottom surface, mixed liquid container lifting mechanism is equipped with mixed liquid container, for accommodating mixed liquid containing microparticle, acoustic control module is set in the lower side of mixed liquid container, for projecting ultrasonic wave to mixed liquid container, to control the spatial arrangement of microparticle in mixed liquid;Layer-by-layer solidification platform lifting mechanism is set to one side of water tank, layer-by-layer solidification platform is installed on layer-by-layer solidification platform lifting mechanism, layer-by-layer solidification platform is set opposite to mixed liquid container, solidification light source is set to mixed liquid container, for the light curing of mixed liquid in mixed liquid container.The application effectively combines acoustic holography technology and 3D printing technology, can arrange microparticle in precursor liquid in the process of material layer-by-layer solidification, and manufacture composite material with arbitrary three-dimensional structured microparticle arrangement.

Description

Technical Field

[0001] This invention relates to the field of composite material processing, and in particular to an acoustic-assisted manufacturing device and method for particulate composite materials based on acoustic holography technology. Background Technology

[0002] Engineered materials with precisely patterned micro / nanoparticles can exhibit unique mechanical, electrical, thermal, acoustic, and electromagnetic properties, attributed to the specific type, geometry, and spatial pattern of the embedded particles. These materials are designed for applications such as stealth, subwavelength imaging, and multifunctional composites with customized electrical and mechanical properties. They have wide applications in soft robotics, electronics, batteries, and biomedicine, particularly in flexible electronic components and devices.

[0003] 3D printing is a common additive manufacturing method capable of rapidly producing materials with complex structures. Combining 3D printing technology with directly assembling functional micro / nanoparticles or fibers within polymers using external physical fields is an effective method for manufacturing functional composite materials. Currently, common methods for particle patterning involve controlling electric or magnetic fields, but these require conductive and ferromagnetic particles respectively, limiting both material selection and scalability in the manufacturing process. Since acoustic fields possess a certain acoustic radiation force, they can directly manipulate the distribution of nanomaterials in fluid media. Therefore, some researchers have proposed using sound waves for patterning micro / nanoparticles, followed by curing using a curing light source. However, existing technologies all use surface acoustic waves (SAWs) for particle arrangement, limiting particles to regular arrays such as horizontal or diagonal lines in a plane. Composite materials manufactured using SAWs exhibit relatively simple particle arrangements, limiting their application scenarios.

[0004] To compensate for the limitations of surface acoustic waves in trapping particles, acoustic holography has emerged. This technology calculates and records the phase or amplitude information of a target holographic sound field onto the positions of acoustic holographic pixel units arranged in two-dimensional space, and reconstructs the target sound field under specific incident conditions. Currently, researchers have used 3D printing technology to fabricate polymer metasurfaces with varying thicknesses, called acoustic holographic phase plates, enabling free control and reconstruction of arbitrarily complex sound fields. However, because the shape of the acoustic holographic plate is fixed, it can only realize a single holographic sound field. Therefore, there is an urgent need to develop a method for manufacturing acoustic-assisted particle composite materials with reconfigurable acoustic holography technology. Summary of the Invention

[0005] To address the above problems, and given the limited functionality and application scenarios of existing sound-assisted additive manufacturing technologies, this invention proposes a sound-assisted manufacturing device and method for particle composite materials based on sound holography technology. This method utilizes a polymer material sound holographic plate prepared with crystalline polymers and a traditional high-precision moving platform, effectively combining sound holography technology and 3D printing technology. This allows for the arbitrary arrangement of micro and nano particles in the precursor liquid during the layer-by-layer curing process of the material, thereby creating composite materials with arbitrary three-dimensional structured particle arrangements.

[0006] The technical solution adopted in this invention is:

[0007] This invention includes a water tank, an acoustic control module, a mixing container, a layer-by-layer curing platform, a mixing container lifting mechanism, a layer-by-layer curing platform lifting mechanism, and a curing light source. The acoustic control module and the mixing container lifting mechanism are both fixed to the bottom surface of the water tank. A mixing container is installed on the mixing container lifting mechanism. The mixing container is horizontally positioned to contain a mixing liquid containing particles. The mixing container lifting mechanism is used to move the mixing container vertically. The acoustic control module is located directly below the mixing container and is used to project phase-modulated ultrasonic waves into the mixing container to control the spatial arrangement of particles in the mixing liquid.

[0008] The layer-by-layer curing platform lifting mechanism is located on one side of the water tank. The layer-by-layer curing platform is installed on the lifting mechanism, which drives the layer-by-layer curing platform to move vertically. The layer-by-layer curing platform is positioned directly opposite the mixing container, and the curing light source is positioned towards the mixing container to perform photocuring on the mixing liquid inside the container. The acoustic control module includes a planar ultrasonic transducer and an acoustic holographic plate. The acoustic holographic plate is used to modulate the phase of the ultrasonic waves emitted by the planar ultrasonic transducer.

[0009] The acoustic control module also includes an acoustic reflector, an acoustic control module bracket, and a laser projection module. The acoustic control module bracket is fixed to the bottom surface of the water tank. A planar ultrasonic transducer is vertically mounted on one side of the acoustic control module bracket to emit ultrasonic waves in the horizontal direction. The acoustic reflector is located on the side where the planar ultrasonic transducer emits ultrasonic waves and is installed obliquely inside the bracket to reflect the horizontally incident ultrasonic waves into a vertically upward sound beam. The acoustic hologram is horizontally mounted on the upper surface of the acoustic control module bracket, located between the acoustic reflector and the mixing container, to receive vertically incident ultrasonic waves and modulate the phase of the ultrasonic waves. The laser projection module is used to emit a preset laser pattern onto the acoustic hologram, thereby changing the local physical state of the acoustic hologram to modulate the phase of the incident ultrasonic waves. The ultrasonic waves emitted horizontally by the planar ultrasonic transducer are reflected by the acoustic reflector and then incident vertically upward onto the acoustic hologram, thereby forming a preset sound field distribution through phase modulation by the acoustic hologram.

[0010] The acoustic holographic plate is divided into N×N acoustic holographic units, each of which has two states: crystalline and amorphous, and the two states change reversibly with temperature.

[0011] The amorphous acoustic holographic unit is formed by melting the crystalline acoustic holographic unit under the illumination of a laser beam emitted by the laser projection module.

[0012] The thickness of the acoustic holographic plate satisfies the following formula:

[0013] φ=arg(P c -P a )=π

[0014] P a =e i(2πhf / va)

[0015] P c =e i(2πhf / vc)

[0016] Where φ represents the phase difference between the transmitted sound fields of the molten state unit and the crystalline state unit, and P a and P c Let represent the transmitted sound field of the molten state unit and the crystalline state unit, respectively; arg() represents the phase of the complex number; h represents the thickness of the acoustic hologram; f represents the frequency of the ultrasonic waves emitted by the planar ultrasonic transducer; e represents the base of the natural logarithm; i represents the imaginary unit; and va and vc represent the sound velocity of the acoustic hologram in the molten state unit and the crystalline state unit, respectively.

[0017] Both the layer-by-layer curing platform lifting mechanism and the layer-by-layer curing platform lifting mechanism are slide rails.

[0018] Both the mixing container and the layer-by-layer curing platform are hollow annular structures with a transparent film fixed to their bottom surfaces to contain the liquid.

[0019] The film on the bottom surface of the layer-by-layer curing platform has better adhesion to the cured mixture than the film on the bottom surface of the mixture container. This allows the cured mixture to be adsorbed and lifted synchronously with the platform as it rises and falls.

[0020] The acoustic-assisted manufacturing method for particulate composite materials based on acoustic holography technology includes the following steps:

[0021] S1. Add water to the water tank and the layer-by-layer curing platform so that the distance between the water surface in the water tank and the acoustic holographic panel is equal to the preset target sound field focal length.

[0022] S2. Add a preset volume of the mixture containing particles into the mixing container, adjust the height of the mixing container so that the water surface of the mixture in the mixing container is level with the water surface in the water tank, and then adjust the height of the layer-by-layer curing platform so that the lower surface of the layer-by-layer curing platform contacts the water surface of the mixture.

[0023] S3. Based on the target particle arrangement pattern, a laser irradiation distribution pattern is obtained by processing and converting it. The laser projection module then irradiates the acoustic hologram with laser light according to the laser irradiation distribution pattern.

[0024] S4. Turn on the planar ultrasonic transducer and curing light source until the mixture containing microparticles is cured to obtain a cured layer with the target microparticle arrangement pattern. Raise the layer-by-layer curing platform and drive the cured layer attached to the lower surface of the layer-by-layer curing platform to rise synchronously.

[0025] S5. Change the target particle arrangement pattern and repeat steps S2 to S4 until all preset target particle arrangement pattern curing layers are cured to obtain a molded part with all preset target particle arrangement patterns.

[0026] Step S3 specifically involves:

[0027] S3.1. Obtain the target sound pressure amplitude distribution by processing the preset target particle arrangement pattern;

[0028] S3.2. The phase distribution of the acoustic hologram is obtained by processing the target sound pressure amplitude distribution using the iterative angular spectrum method.

[0029] S3.3. The phase distribution of the acoustic hologram is binarized to obtain the laser irradiation distribution pattern;

[0030] S3.4 The laser projection module projects laser light onto the acoustic hologram according to the laser irradiation distribution pattern.

[0031] The beneficial effects of this invention are:

[0032] This invention effectively combines acoustic holography and 3D printing technologies, enabling the arbitrary arrangement of micro- and nano-particles in the precursor solution during the layer-by-layer curing process, thus creating composite materials with arbitrary three-dimensional structured particle arrangements. This invention allows for the fabrication of patterned particle composite materials in a non-transparent environment and enables the polymer to be cured after the particle arrangement without contact with sound waves, thereby endowing the polymer with other special properties or functions. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the sound-assisted manufacturing device for the microparticle composite material.

[0034] Figure 2 This is an axial view of the overall structure of the sound-assisted manufacturing device for the microparticle composite material.

[0035] Figure 3 This is an isometric view of the acoustic control module of the acoustic-assisted manufacturing device for the microparticle composite material.

[0036] Figure 4This is a side view of the acoustic control module of the acoustic-assisted manufacturing device for the microparticle composite material.

[0037] Figure 5 This is a schematic diagram of the programming of the laser-irradiated acoustic holographic panel in the acoustic control module.

[0038] Figure 6 This is an isometric view of the lifting mechanism of the layer-by-layer curing platform of the acoustic-assisted manufacturing device for the microparticle composite material.

[0039] Figure 7 This is a side view of the lifting mechanism of the layer-by-layer curing platform of the acoustic-assisted manufacturing device for the microparticle composite material.

[0040] Figure 8 This is a schematic diagram of the manufacturing process of the sound-assisted manufacturing device for the microparticle composite material.

[0041] In the diagram: 1. Platform base; 2. Acoustic reflector; 3. Acoustic control module bracket; 4. Planar ultrasonic transducer; 5. Left linear precision slide rail; 6. Right linear precision slide rail; 7. Tablet clamp; 8. Acoustic hologram plate; 9. Left slider knob; 10. Right slider knob; 11. Right moving slider; 12. Right mixing container bracket; 13. Left moving slider; 14. Left mixing container bracket; 15. Left slider locking knob; 16. Right slider locking knob; 17. Mixing container; 18. Layer-by-layer manufacturing platform base; 19. Stepper motor; 20. Stepper motor coupling; 21. Lead screw; 22. Right moving slide rail; 23. Right moving slider; 24. Left moving slider; 25. Left moving slide rail; 26. Clearance nut; 27. Layer-by-layer manufacturing platform top bracket; 28. Bearing seat; 29. ​​Moving cantilever beam; 30. Curing platform bracket; 31. Layer-by-layer curing platform. Detailed Implementation

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of protection of this invention.

[0044] like Figure 1 and Figure 2As shown, this embodiment includes a water tank, an acoustic control module, a mixing liquid container 17, a layer-by-layer curing platform 31, a mixing liquid container lifting mechanism, a layer-by-layer curing platform lifting mechanism, and a curing light source. The acoustic control module and the mixing liquid container lifting mechanism are both fixed to the bottom surface of the water tank. The mixing liquid container 17 is detachably installed on the mixing liquid container lifting mechanism. The mixing liquid container 17 is horizontally arranged and is used to contain a mixing liquid containing particles. The mixing liquid container lifting mechanism is used to drive the mixing liquid container 17 to move in the vertical direction. The acoustic control module is located directly below the mixing liquid container 17 and is used to project phase-modulated ultrasonic waves into the mixing liquid container 17, thereby controlling the spatial arrangement of particles in the mixing liquid. The acoustic control module realizes dynamic modulation of the sound field.

[0045] The lifting mechanism of the layer-by-layer curing platform is located on one side of the water tank. The layer-by-layer curing platform 31 is detachably installed on the lifting mechanism. The lifting mechanism is used to drive the layer-by-layer curing platform 31 to move vertically. The layer-by-layer curing platform 31 is positioned directly opposite the mixing container 17. The curing light source is positioned towards the mixing container 17 and is used to perform layer-by-layer photocuring on the mixing liquid in the mixing container 17. The acoustic control module includes a planar ultrasonic transducer 4 and a reconfigurable acoustic holographic plate 8. The acoustic holographic plate 8 is used to perform phase modulation on the ultrasonic waves emitted by the planar ultrasonic transducer 4.

[0046] The curing light source can be selected as a visible light source or an ultraviolet light source according to the different curing conditions of the particulate composite material mixture.

[0047] like Figure 3 , Figure 4 As shown, the acoustic control module also includes an acoustic reflector 2, an acoustic control module bracket 3, and a laser projection module. The acoustic control module bracket 3 is fixed to the bottom surface of the water tank. The planar ultrasonic transducer 4 is vertically fixed on one side of the acoustic control module bracket 3 for emitting ultrasonic waves in the horizontal direction. The acoustic reflector 2 is located on the side where the planar ultrasonic transducer 4 emits ultrasonic waves and is installed obliquely inside the bracket 3 for reflecting the horizontally incident ultrasonic waves into a vertically upward sound beam. The reconfigurable acoustic holographic plate 8 is horizontally installed on the upper surface of the acoustic control module bracket 3 and fixed by the clamping clip 7. It is located between the acoustic reflector 2 and the mixing liquid container 17, that is, directly below the mixing liquid container 17 and directly above the acoustic reflector 2, for receiving vertically incident ultrasonic waves and modulating the phase of the ultrasonic waves.

[0048] That is, the planar ultrasonic transducer 4 sends a planar sound wave to the acoustic reflector 2, and after reflection, the sound wave is sent vertically upward to the acoustic holographic plate 8. After being modulated by the acoustic holographic plate 8, the planar sound wave propagates forward to the target plane to form the target sound field.

[0049] Specifically, the planar ultrasonic transducer 4 is a conventional ultrasonic transducer; the acoustic reflector 2 has a large difference in acoustic impedance from water, and can be selected from glass or metal; the acoustic holographic plate 8 is a polymer material, specifically a crystalline polymer with photothermal conversion properties, which can be programmed using laser regionalization, and the programmed acoustic holographic plate 8 can perform high-precision modulation of the incident sound wave.

[0050] The laser projection module is positioned directly below the acoustic holographic panel 8 and is used to emit a preset laser pattern onto the reconfigurable acoustic holographic panel 8, thereby changing the local physical state of the acoustic holographic panel 8 to modulate the phase of the incident ultrasonic wave; the ultrasonic wave emitted by the planar ultrasonic transducer 4 in the horizontal direction is reflected by the acoustic reflector 2 and then incident vertically upwards onto the acoustic holographic panel 8, thereby forming a preset sound field distribution through phase modulation of the acoustic holographic panel 8.

[0051] The acoustic reflector 2 is made of glass or a transparent material, allowing lasers to pass through without damage.

[0052] like Figure 5 As shown, the local physical state refers to the fact that the material used in the acoustic holographic plate 8 has two physical states: a crystalline state and a molten state. Laser irradiation increases the temperature of the material, causing it to change from a crystalline state to a molten state. When the laser is removed or the material is cooled, it can recrystallize and return to a crystalline state.

[0053] The acoustic holographic plate 8 is divided into several regularly arranged units, each of which can be independently in a molten or crystalline state to modulate the phase of the transmitted sound field. By irradiating the acoustic holographic plate 8 with a laser in a preset pattern, different areas of the plate surface can present different physical states, thereby achieving spatial distribution phase modulation of the incident ultrasonic waves.

[0054] In the crystalline state, the material's molecules are arranged in a regular manner, and its refractive index and acoustic properties are stable; in the molten state, the molecules are arranged in a disordered manner, and its refractive index and acoustic properties change.

[0055] The aforementioned acoustic holographic plate 8, based on a crystalline polymer, exhibits different material and acoustic properties in its crystalline and molten states, specifically in terms of Young's modulus and sound velocity. Generally, the material has a higher Young's modulus and a faster sound velocity in its crystalline state, while it has a lower Young's modulus and a slower sound velocity in its molten state. Furthermore, after the material is doped with a photothermal conversion medium, the two states can be rapidly and reversibly switched under the action of a laser, thereby achieving reversible switching between different sound velocity ranges.

[0056] The acoustic holographic plate (8) is divided into N×N acoustic holographic units. Each acoustic holographic unit has two states: crystalline and amorphous. The two states change reversibly with temperature.

[0057] The amorphous acoustic holographic unit is formed by melting the original crystalline acoustic holographic unit under the irradiation of a laser beam emitted by the laser projection module. The acoustic holographic unit has different material properties and acoustic properties in the crystalline and amorphous states. The crystalline polymer material has different material properties and acoustic properties in the crystalline and amorphous states, mainly manifested in Young's modulus and sound velocity. Specifically, the Young's modulus and sound velocity of the amorphous state are both lower than those of the crystalline state.

[0058] Laser pulse beams scan and irradiate different acoustic holographic units, causing two states of acoustic holographic plates 8 on the crystalline polymer material to form a patterned arrangement, which serves as the acoustic holographic phase distribution of the phase acoustic holographic device.

[0059] Each pulse corresponds to irradiating one acoustic holographic unit. Different pulses correspond to different acoustic holographic units. The longer the laser pulse irradiation time and the higher the energy, the higher the temperature of the crystalline polymer in the corresponding region. Furthermore, by controlling the duration and energy of the pulse irradiation of the acoustic holographic unit, the temperature of the acoustic holographic unit after irradiation can be controlled to remain within 10% above the melting temperature.

[0060] The acoustic holographic panel 8 is made of crystalline polymers, specifically polycaprolactone, polythiourethane, etc., and has two states: crystalline and molten. The laser projection module is used to independently control the state (crystalline or molten) of each acoustic holographic unit.

[0061] Crystalline polymers have two reversible states: a crystalline state and a molten state. When the external temperature is higher than the material's melting temperature T, the crystalline state changes. m At temperatures below the material's crystallization temperature Tc, a dynamic transition between two phases occurs. The crystalline state exhibits high Young's modulus and sound velocity, while the molten state has low Young's modulus and sound velocity. Furthermore, during the phase transition, the material's thickness hardly changes; only the sound velocity alters. A two-dimensional spatial arrangement of microstructural regions with different sound velocities at the same thickness can achieve phase modulation of the transmitted / reflected sound field. A certain sound velocity difference exists between the molten and crystalline regions, thus enabling phase distribution on a spatial plane.

[0062] In the molten state, the material has a lower Young's modulus, exhibiting softer mechanical properties and a lower sound velocity; in the crystalline state, it has a higher Young's modulus, exhibiting harder mechanical properties and a higher sound velocity. Generally, the Young's modulus of the crystalline state is two orders of magnitude higher than that of the molten state.

[0063] The thickness of the acoustic holographic panel 8 satisfies the following formula:

[0064] φ=arg(P c -P a )=π

[0065] P a =ei(2πhf / va)

[0066] P c =e i(2πhf / vc)

[0067] Where φ represents the phase difference between the transmitted sound fields of the molten state unit and the crystalline state unit, and P a and P c Let represent the transmitted sound field of the molten state unit and the crystalline state unit, respectively; arg() represents the phase of the complex number; h represents the thickness of the acoustic holographic plate 8; f represents the frequency of the ultrasonic waves emitted by the planar ultrasonic transducer 4; e represents the base of the natural logarithm; i represents the imaginary unit; and va and vc represent the sound velocity of the acoustic holographic plate 8 in the molten state unit and the crystalline state unit, respectively.

[0068] The thickness h of the plate must be set to ensure that the phase difference between the transmitted sound waves from the molten and crystalline states is π, thus achieving ideal sound field phase encoding. The reversible switching of the sound velocity zones allows material units of the same thickness but different sound velocities to have different phase delays in their transmitted sound fields. When the material thickness is matched to the frequency of the planar piezoelectric transducer, the phase delay of the transmitted sound field in different sound velocity zones can precisely satisfy π. After laser-regional programming of the material, spatial phase encoding of the target sound field can be achieved.

[0069] Both the layer-by-layer curing platform lifting mechanism and the layer-by-layer curing platform lifting mechanism are slide rail structures.

[0070] Both the mixing container 17 and the layer-by-layer curing platform 31 are hollow annular structures with a transparent film fixed to their bottom surfaces to contain the liquid.

[0071] The film on the bottom surface of the layer-by-layer curing platform 31 has better adhesion to the cured mixture than the film on the bottom surface of the mixture container 17. It is used to adsorb the cured mixture so that the cured mixture is raised synchronously with the platform as it rises and falls.

[0072] That is, the film at the bottom of the mixture container 17 has poor affinity with the polymer that has completed polymerization, while the film on the bottom surface of the layer-by-layer curing platform 31 has strong affinity with the polymer. After polymerization, it can adhere to the bottom of the film 31 and rise together. The criterion for judging poor and strong affinity is whether it can stably adhere to the target cured mixture.

[0073] The mixing container 17 has a hollow structure with a thin film attached to the bottom, which ensures both ultrasonic transmission and storage of the uncured particulate composite material mixture. The layer-by-layer curing platform 31 has a hollow bottom and a release film to facilitate material curing and adhesion. The platform can be filled with deionized water to ensure minimal reflection of transmitted sound waves.

[0074] The uncured particulate composite material mixture is stored in the mixture container 17. Furthermore, the high-precision motion control device controls the movement of the layer-by-layer curing platform 31. When the release film at the bottom of the layer-by-layer curing platform 31 comes into contact with the mixture, the layer-by-layer curing of the particulate patterned mixture can be achieved by combining the curing light source and the acoustic control module.

[0075] It also includes a platform base 1 and a tablet clamp 7. The platform base 1 is placed on the bottom surface of the water tank. The acoustic control module and the mixing container lifting mechanism are both fixed on the platform base 1 for easy handling and debugging.

[0076] The pressing clip 7 is located on the side of the upper surface of the acoustic control module bracket 3 and is used to fix the acoustic holographic plate 8.

[0077] The outer diameter of the layer-by-layer curing platform 31 is slightly smaller than the inner diameter of the mixing container 17.

[0078] In summary, the acoustic-assisted manufacturing device for microparticle composite materials consists of an acoustic control module and a layer-by-layer manufacturing platform. The acoustic control module dynamically modulates the sound field, while the layer-by-layer manufacturing platform solidifies the precursor liquid for patterned microparticles layer by layer. The acoustic control module comprises a platform base, a planar ultrasonic transducer, an acoustic reflector, a clamping device, a reprogrammable acoustic hologram, precision slide rails, a movable slider, a mixing liquid support, and corresponding supports. The planar ultrasonic transducer is vertically mounted on the acoustic control module support, with a 45° inclined acoustic reflector mounted in the center of the support. After the planar ultrasonic transducer incident a planar sound wave, the sound wave is reflected and incident vertically upwards onto the reprogrammable acoustic hologram. To ensure the flatness of the acoustic hologram, a clamping device is used to control its position. Slide rails with precision sliders are mounted on both sides of the platform base. During the manufacturing process, ultrasound requires a medium for propagation; therefore, the acoustic control module must be completely immersed in a water tank, and the sliders are adjusted to slightly immerse the mixing liquid container in the liquid. Furthermore, the distance between the water level in the tank and the acoustic holographic plate must be consistent with the focal length of the target sound field. Even further, the liquid level of the mixed liquid stored in the mixed liquid container must be consistent with the external water level.

[0079] A method for acoustic-assisted manufacturing of particulate composite materials based on acoustic holography technology includes the following steps:

[0080] S1. Add deionized water to the water tank and the layer-by-layer curing platform 31, so that the distance between the deionized water surface in the water tank and the acoustic holographic plate 8 is equal to the focal length of the sound field generated by the acoustic control module.

[0081] First, the assembly of the layer-by-layer manufacturing platform and acoustic control module is completed. The entire manufacturing equipment is then placed in a water tank filled with deionized water and immersed in it. The water level is controlled so that the distance between the water surface and the acoustic holographic plate is the focal length of the target sound field.

[0082] S2. Add a preset volume of a mixture containing microparticles into the mixture container 17. Adjust the height of the mixture container 17 using the mixture container lifting mechanism so that the surface of the mixture in the mixture container 17 is flush with the surface of the deionized water in the water tank. Then, adjust the height of the layer-by-layer curing platform 31 using the layer-by-layer curing platform lifting mechanism so that the film on the lower surface of the layer-by-layer curing platform 31 just touches the surface of the mixture in the mixture container 17.

[0083] The volume fraction of the microparticles in the mixture containing microparticles does not exceed 50%, depending on the printed pattern.

[0084] That is, pour the pre-mixed composite material precursor liquid with microparticles into the mixing container, adjust the moving slide rail to make the liquid container slightly submerged in the water surface, and ensure that the liquid surface of the mixture in the liquid container is level with the external water surface; then control the layer-by-layer curing platform 31 to move and contact the liquid surface of the mixture.

[0085] S3, such as Figure 5 and Figure 8 As shown, a laser irradiation distribution pattern is obtained by processing and converting the preset target particle arrangement pattern, and the laser projection module irradiates the acoustic hologram 8 with laser according to the laser irradiation distribution pattern.

[0086] The laser scanner is then activated to complete the programming of the corresponding acoustic hologram.

[0087] S4. Turn on the planar ultrasonic transducer 4 and the curing light source until the mixture containing particles is completely cured to obtain a cured layer with the target particle arrangement pattern. Raise the layer-by-layer curing platform 31 so that the cured layer attached to the lower surface of the layer-by-layer curing platform 31 is raised synchronously.

[0088] The planar ultrasonic transducer is activated to capture the target particles, while the curing lamp is turned on to cure the mixture. The layer-by-layer curing platform is moved while the composite material precursor liquid is added; a laser scanner is used to scan the new pattern to switch between different target acoustic fields, and then the curing operation is repeated.

[0089] The target sound field possesses a certain acoustic radiation force, which can capture the microparticles in the mixture within the corresponding area. As the layer-by-layer manufacturing platform moves, the acoustic control module dynamically switches the target sound field, thereby achieving the arrangement of differentiated microparticle patterns in different layers.

[0090] S5. Replace with a new preset target particle arrangement pattern, and repeat steps S2 to S4 until all preset target particle arrangement pattern curing layers are cured to obtain a molded part with all preset target particle arrangement patterns.

[0091] After a certain number of layers of composite material have been cured, the moving beam is moved upward to ensure that the layer-by-layer curing platform leaves the mixing container; the manufactured composite material is then removed along with the layer-by-layer curing platform, and the material is peeled off from the release film to complete the manufacturing process.

[0092] The pattern distribution of the target sound field can vary depending on the curing layer, but the focal length of the target sound field remains consistent.

[0093] Step S3 specifically involves:

[0094] S3.1. The target sound field is obtained by processing the preset target particle arrangement pattern. The target sound field includes the target sound pressure amplitude distribution and the target sound field focal length.

[0095] S3.2. The phase distribution of the acoustic hologram plate 8 is obtained by processing the target sound pressure amplitude distribution using the iterative angular spectrum method.

[0096] S3.3. Binarize the phase distribution of the acoustic holographic plate 8 to obtain the laser irradiation distribution pattern; that is, after completing the phase distribution calculation, to facilitate subsequent polymer programming, a binary simplification operation is performed on its value range: when cos(φ0)>0, then φ0=π, otherwise φ0=0. The laser scanning area can then be obtained.

[0097] S3.4 The laser projection module projects laser light onto the acoustic holographic panel 8 according to the laser irradiation distribution pattern.

[0098] To achieve dynamic modulation of the sound field, this invention uses a crystalline polymer as a reprogrammable acoustic hologram. This polymer has two states: a crystalline state and a molten state. In these two different states, it exhibits different mechanical and acoustic properties. The crystalline material has a higher Young's modulus and a faster sound velocity, while the molten material has a lower Young's modulus and a slower sound velocity. Furthermore, the material's temperature in this state is higher than its melting point. T m or below the crystallization temperature T c At this time, there is a dynamic switching between the two phases. Material units of the same thickness but different sound velocities can achieve spatial phase encoding of the transmitted sound field.

[0099] The transmitted sound field of an incident plane wave with frequency f after passing through molten and crystalline polymer units can be expressed as:

[0100] P a =e i(kah) and P c =e i(kch)

[0101] Where: v a and v c Let k be the sound velocity of the molten state unit and the crystalline state unit, respectively. a=2πf / v a and k c =2πf / v c These are the wavenumbers of the molten state unit and the crystalline state unit, respectively. When the phase difference between them satisfies: φ = arg(P c -P a When ) = π, the thickness of the acoustic holographic plate can be determined to be h.

[0102] Preferably, after the crystalline polymer is doped with a certain amount of photothermal medium, it can be programmed using a high-precision laser. That is, at the laser scanning point, the material can change from its original crystalline state to a molten state. The unscanned area can change from a molten state to a crystalline state after cooling for a certain period of time. If the same area is scanned repeatedly, that area can be kept in a molten state.

[0103] Photothermal media can be selected from Sudan Black, carbon nanotubes, carbon black, etc.

[0104] Step S3.2 specifically includes:

[0105] The laser scanning area is actually the phase encoding of the acoustic hologram, which can be calculated using the iterative angular spectrum method. The entire iterative process can be divided into forward propagation and backward optimization processes.

[0106] The sound pressure amplitude distribution of the target plane is A(x,y,z=l), where l is the focal length corresponding to the target sound field.

[0107] Before the iterative optimization begins, the phase distribution φ0 of the holographic surface is arbitrary, and at this time the transmitted sound field p0(x,y,z=0)=e (iφ0) The spectrum of this plane can be calculated using Fourier transform: P0(k x ,k y ,z=0)=∫∫p0(x,y,z=0)dxdy;

[0108] Then, the transmitted sound field propagates along the positive z-axis, and the spectrum is multiplied by the phase conversion factor H(k). x ,k y ,z=l)=e (ikzl) Then, the spectral distribution P on the target image plane z=l can be obtained. ’ (k x ,k y ,z=l)=P0(k x ,k y ,z=0)* H(k x ,k y ,z=l), where k z =(k0 2 -k x 2 -k y 2 )1 / 2 .

[0109] At this point, the sound field distribution p on the plane can be obtained through inverse Fourier transform. ’ (x,y,z=l)=∫∫P ’ (k x ,k y ,z=l)dk x dk y .

[0110] At this time, the phase φ on the target image plane z=l is... ’ (x,y,z=l)=arg(p ’ By preserving (x,y,z=l) and replacing its amplitude with the target focusing amplitude distribution A(x,y,z=l), the sound field on the z=l plane can be obtained: q ’ (x,y,z=l)=A(x,y,z=l)*e (iφ’(x,y,z=l)) .

[0111] After the forward propagation is complete, the backward optimization begins. This involves the sound field q propagating backward from the target image plane z=l to z=0. ’ (x,y,z=l), similarly, the spectral distribution of this plane is first calculated using Fourier transform: Q ’ (k x ,k y ,z=l)=∫∫q ’ (x,y,z=l)dxdy, and then, as it propagates along the negative z-axis, its spectrum is multiplied by the phase factor H(k). x ,k y ,z=(-l))=e (ikz(-l)) Then, the spectral distribution Q0(k) on the plane z=0 can be obtained. x ,k y ,z=0)=Q ’ (k x ,k y ,z=l)*H(k x ,k y ,z=(-l)). And the sound field distribution on the holographic plane z=0 was obtained as q0(x,y,z=0)=∫∫Q0(k x ,k y ,z=0)dk x dk y The updated phase distribution is φ0=angle(q0(x,y,z=0)).

[0112] After repeating the iterative calculations several times, the final phase distribution of the holographic plane can be obtained.

[0113] To achieve precise particle capture, the acoustic control module fully utilizes the mechanical effects of the sound field. The spatial sound field scatters on the particle surface, generating acoustic radiation stress along the gradient direction, which propels the particles in the background medium towards directions with higher or lower sound energy. The magnitude of the acoustic radiation force is: F = -▽U p ▽ is the gradient operator, U p Potential energy is the energy possessed by a particle.

[0114] The potential energy possessed by a particle can be expressed as:

[0115] U p =2πρ0a p 3 {( <p 2 > / 3ρ0 2 c0 2 )f1-( <v 2 > / 2)f2}

[0116] in <p 2 > represents the time average over one period, p and v represent the sound pressure and vibration velocity at the particle's location in the incident sound field, respectively, where f1 = 1 - (c0) / (c0) 2 ρ0 2 ) / (c p 2 ρ p ) and f1=2(ρ p -ρ0) / (2ρ p +ρ0) are two constants related to the physical parameters of the particles and the medium. The frequency of the planar transducer in the acoustic control module can be selected from 1 to 5 MHz. The higher the selected frequency of the planar transducer, the higher the accuracy of particle capture.

[0117] To achieve the manufacturing of microparticle composite materials, specifically the curing of patterned mixtures, a layer-by-layer manufacturing platform consists of a high-precision motion module and a curing platform. The high-precision motion module includes a layer-by-layer manufacturing platform base, a stepper motor, a coupling, a lead screw, and a sliding rail with a movable slider. The stepper motor is bolted to the layer-by-layer manufacturing platform base. The bottom of the lead screw is connected to the stepper motor via a coupling, and the top is mounted on the top support of the layer-by-layer manufacturing platform via a bearing seat. High-precision rotation of the stepper motor can be achieved by programming it with an external circuit. A backlash-free nut is installed at the rear of the movable suspension beam, connecting it to the lead screw, and the front end is connected to the movable slider. When the stepper motor drives the lead screw to rotate, the backlash-free nut converts the lead screw's circular motion into linear motion. At this time, the movable suspension beam can complete high-precision vertical linear movement. A curing platform support and the curing platform are installed under the movable suspension beam. The curing platform has a hollow structure, with a release film adhered to its bottom. A small amount of deionized water can be stored inside the platform to ensure that transmitted sound waves are not strongly reflected. On the outside of the platform, a curing light source is installed. The curing light source can be selected according to the photoinitiation type of the mixed liquid, such as ultraviolet light source or visible light source.

[0118] In the curing process of the particulate composite material, the layer-by-layer curing platform is first immersed in the mixing solution container. A high-precision motion module controls the release film at the bottom of the platform to contact the mixing solution while maintaining a certain distance from the bottom of the mixing solution container. At this point, the laser is turned on to program the holographic plate, and then the planar ultrasonic transducer is activated. The incident sound field aligns the particles in the mixture to the corresponding areas. Next, the curing light source is turned on to complete the curing of this layer of composite material. Further, the ultrasonic transducer is turned off, the curing platform is controlled to move upward, and uncured particulate composite material mixture is added to the mixing solution container. The laser is then used to reprogram the acoustic holographic plate, at which point the particles will rearrange themselves according to the new target sound field. The curing light source is turned on to complete a new layer of particulate composite material curing. By repeating the above operations, the fabrication of a three-dimensionally structured particulate composite material can be achieved.

[0119] like Figure 6 and Figure 7As shown, the layer-by-layer curing platform lifting mechanism includes a layer-by-layer manufacturing platform base 18, a stepper motor 19, a stepper motor coupling 20, a lead screw 21, two sliders, two slide rails, a backlash-free nut 26, a layer-by-layer manufacturing platform top support 27, a bearing seat 28, a movable cantilever beam 29, and a curing platform support 30. The stepper motor 19 is fixedly installed on one side of the layer-by-layer manufacturing platform base 18, and the output shaft of the stepper motor 19 is fixedly connected to one end of the lead screw 21 through the stepper motor coupling 20. The lead screw 21 is vertically arranged, and the other end of the lead screw 21 passes through a through hole in the middle of the layer-by-layer manufacturing platform top support 27 and is fixed through the bearing seat 28. The bearing seat 28 is located above the layer-by-layer manufacturing platform top support 27 and connected to the layer-by-layer manufacturing platform top support 27. A backlash-free nut 26 is fitted on the lead screw 21 between the stepper motor coupling 20 and the layer-by-layer manufacturing platform top support 27.

[0120] The stepper motor 19 in the high-precision motion device needs to be programmed using an external device according to the curing degree of the microparticle composite material layer by layer.

[0121] The two slide rails are located on both sides of the lead screw 21. The two slide rails are vertically and parallelly fixed between the base 18 of the layer-by-layer manufacturing platform and the top support 27 of the layer-by-layer manufacturing platform. Each slide rail is equipped with a slider. Each end of the movable suspension beam 29 is fixed to the corresponding slide rail by a slider. The gap-eliminating nut 26 is fixedly connected to one side of the movable suspension beam 29 to drive the movable suspension beam 29 to move in the vertical direction. The other side of the movable suspension beam 29 is fixedly installed with the curing platform support 30. The two slide rails and two sliders are the left movable slide rail 25, the left movable slider 24, the right movable slide rail 22, and the right movable slider 23, respectively.

[0122] The layer-by-layer manufacturing platform consists of a layer-by-layer manufacturing platform base 18, movable slide rails 22 and 25, a layer-by-layer curing platform 31, and corresponding high-precision motion control devices and supports. The movable slide rails 22 and 25 and the stepper motor 19 are respectively mounted on the layer-by-layer manufacturing platform base 18. A coupling 20 is mounted on the top of the stepper motor and connects it to a lead screw 21. The lead screw 21 is fixed by a bearing seat 28 mounted on the top support 27 of the layer-by-layer manufacturing platform. Movable suspension beams 29 are mounted on the movable slide rails 22 and 25, and the movable suspension beams 29 are engaged with the lead screw 21 using a backlash-free nut 26. The curing platform support 30 is mounted on the movable suspension beams 29, and the layer-by-layer curing platform 31 can be portablely mounted on the curing platform support 30.

[0123] The lifting mechanism for the mixing container is a precision slide rail, comprising two lifting units located on either side of the acoustic control module, with the bottom surfaces of both units fixedly connected to the bottom surface of the water tank. Each lifting unit includes a linear precision slide rail, a movable slider, a slider knob, a slider locking knob, and a mixing container support. Taking the left lifting unit as an example, it includes a left linear precision slide rail 5, a left slider knob 9, a left slider locking knob 15, a left movable slider 13, and a left mixing container support 14. The left mixing container support 14 is mounted on the left linear precision slide rail 5 via the left movable slider 13 and can move vertically along the left linear precision slide rail 5. The left slider knob 9 is located on the left linear precision slide rail 5 and is used to adjust the height of the slider along the slide rail by rotation. The left slider locking knob 15 is located on the left linear precision slide rail 5 and is used to fix the slider in the desired position.

[0124] Similarly, the right-side lifting unit includes a right linear precision slide rail 6, a right slider knob 10, a right slider locking knob 16, a right movable slider 11, and a right mixing container bracket 12. The slide rail is equipped with a movable slider with a locking knob and a sliding knob, and each slider is equipped with a mixing container bracket for portable installation of the mixing container.

[0125] The device is first used by immersing the acoustic control module in a water tank. The layer-by-layer manufacturing platform is placed directly behind the water tank, and the assembly process must ensure that the layer-by-layer curing platform 31 is concentric with the mixing liquid container 17. The curing light source can be placed above and to the side of the layer-by-layer curing platform 31 in the layer-by-layer manufacturing platform to facilitate the curing of the patterned microparticle composite material.

[0126] It should be noted that during the manufacturing process of the microparticle composite material, the water level in the tank must be controlled to be equal to the target sound field focal length l between the reconfigurable acoustic hologram 8 in the acoustic control module and the water level. In this embodiment, the stepper motor 19 in the layer-by-layer manufacturing platform can be connected to an external circuit for computer control, thereby achieving high-precision movement.

[0127] This embodiment provides a further technical solution for the acoustic control module. The acoustic control module component is integrally mounted on the platform base 1, and an acoustic control module bracket 3 is installed in the middle of the platform base 1. A planar transducer 4 is installed on the side of the acoustic control module bracket 3, and the incident planar sound wave propagates upward after being reflected by the acoustic reflector 2. At this time, the externally calculated holographic planar phase distribution is introduced into the laser, and then the laser is used to vertically incident from the bottom of the acoustic control module. Figure 5 As shown, after laser scanning, the reconfigurable acoustic holographic plate 8 undergoes a transformation from a crystalline to a molten state in the relevant areas, at which point the acoustic holographic plate programming is complete. To ensure the flatness of the reconfigurable acoustic holographic plate 8 during the scanning process, it needs to be fixed directly above the acoustic control module bracket 3 using a clamping clip 7. After the incident plane sound wave is modulated by the acoustic holographic plate, the target sound field is reconstructed at the set focal length.

[0128] Linear precision slide rails with movable sliders are installed on both sides of the acoustic control module bracket 1. The condition knob controls the movement of the sliders, and the locking knob can be used to fix the position when the sliders are moved to the set position. A mixing liquid bracket is installed on the movable slider, and a mixing liquid container is mounted on the bracket.

[0129] It is important to note that the mixing container is a hollow structure, requiring a PET film to be adhered to the bottom before immersion in water. During the manufacturing process of the microparticle composite material, the mixture containing the microparticles is first stored in the mixing container, ensuring the liquid level is flush with the external water surface. This allows for subsequent operations in conjunction with a layer-by-layer manufacturing platform.

[0130] The movable cantilever beam 29 is connected to the lead screw 21 via a gap-free nut 26. A coupling 20 and a stepper motor 19 are mounted at the bottom of the lead screw. During manufacturing, the stepper motor is controlled to rotate via external circuit programming, causing the movable cantilever beam to move downwards. Movement stops when the release film at the bottom of the layer-by-layer curing platform 31 contacts the mixture in the mixing container 17. At this point, the uncured microparticle composite mixture is contained within a unit defined by a thin acoustic window, allowing sound waves to pass through the container with minimal reflection and maintaining their traveling wave characteristics. When the ultrasonic transducer is activated, the acoustic radiation force pushes the particles upwards away from the hologram until they are constrained by the release film at the bottom of the layer-by-layer curing platform 31. The particles tend to have a low bulk modulus and a density slightly higher than water, characterized by a negative acoustic contrast coefficient and high acoustic attenuation. Once constrained, this causes the particles to migrate laterally along the pressure gradient to the high acoustic pressure region. After the microparticles are arranged, the structure can then be cured using a curing light source. Figure 8 As shown, after the curing platform moves upward, the microparticles can be rearranged and then cured again. Repeating this process can yield a composite material with a three-dimensional structured arrangement of microparticles.

[0131] It is worth noting that as the curing platform moves upward, the mixture stored in the mixing container has already solidified onto the release film of the layer-by-layer manufacturing platform, requiring replenishment as needed. During the manufacturing process of multilayer composite materials, if a change in the acoustic field is required, a laser can be used to rescan the reconfigurable acoustic hologram that has regained its crystalline state. If only maintaining the acoustic field is necessary, only a laser can be used to maintain the initial pattern.

[0132] The above detailed embodiments illustrate the technical solution and beneficial effects of the present invention. It should be understood that the above description is only the most preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, additions, and equivalent substitutions made within the scope of the principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A particle composite material acoustic-assisted manufacturing device based on acoustic holography technology, characterized in that: The system includes a water tank, an acoustic control module, a mixing container (17), a layer-by-layer curing platform (31), a mixing container lifting mechanism, a layer-by-layer curing platform lifting mechanism, and a curing light source. The acoustic control module and the mixing container lifting mechanism are both fixed on the bottom surface of the water tank. The mixing container (17) is installed on the mixing container lifting mechanism. The mixing container (17) is horizontally set and is used to contain a mixture containing particles. The mixing container lifting mechanism is used to drive the mixing container (17) to move in the vertical direction. The acoustic control module is set directly below the mixing container (17) and is used to project phase-modulated ultrasonic waves into the mixing container (17) to control the spatial arrangement of particles in the mixture. The layer-by-layer curing platform lifting mechanism is located on one side of the water tank. The layer-by-layer curing platform (31) is installed on the layer-by-layer curing platform lifting mechanism. The layer-by-layer curing platform lifting mechanism is used to drive the layer-by-layer curing platform (31) to move in the vertical direction. The layer-by-layer curing platform (31) is set opposite to the mixing liquid container (17). The curing light source is set towards the mixing liquid container (17) and is used to perform photocuring on the mixing liquid in the mixing liquid container (17). The acoustic control module includes a planar ultrasonic transducer (4) and an acoustic holographic plate (8). The acoustic holographic plate (8) is used to perform phase modulation on the ultrasonic waves emitted by the planar ultrasonic transducer (4). The mixing container (17) and the layer-by-layer curing platform (31) are both hollow annular structures with a transparent film fixed to the bottom surface for containing liquid; The film on the bottom surface of the layer-by-layer curing platform (31) has better adhesion to the cured mixture than the film on the bottom surface of the mixture container (17), which is used to adsorb the cured mixture so that the cured mixture is lifted synchronously with the platform. The acoustic control module also includes an acoustic reflector (2), an acoustic control module bracket (3), and a laser projection module. The acoustic control module bracket (3) is fixed to the bottom of the water tank. The planar ultrasonic transducer (4) is vertically installed on one side of the acoustic control module bracket (3) to emit ultrasonic waves in the horizontal direction. The acoustic reflector (2) is located on the side where the planar ultrasonic transducer (4) emits ultrasonic waves and is installed obliquely inside the bracket (3) to reflect the horizontally incident ultrasonic waves into a vertically upward sound beam. The acoustic holographic plate (8) is horizontally installed in the acoustic control module. The upper surface of the module support (3) is located between the acoustic reflector (2) and the mixing container (17) to receive vertically incident ultrasonic waves and modulate the phase of the ultrasonic waves. The laser projection module is used to emit a preset laser pattern to the acoustic hologram (8), thereby changing the local physical state of the acoustic hologram (8) to modulate the phase of the incident ultrasonic waves. The ultrasonic waves emitted by the planar ultrasonic transducer (4) in the horizontal direction are reflected by the acoustic reflector (2) and then vertically upward into the acoustic hologram (8), thereby forming a preset sound field distribution through the phase modulation of the acoustic hologram (8).

2. The acoustic-assisted manufacturing device for particulate composite materials based on acoustic holography technology according to claim 1, characterized in that: The acoustic holographic plate (8) is divided into N×N acoustic holographic units. Each acoustic holographic unit has two states: crystalline and amorphous. The two states change reversibly with temperature. The amorphous acoustic holographic unit is formed by melting the crystalline acoustic holographic unit under the illumination of a laser beam emitted by the laser projection module.

3. The acoustic-assisted manufacturing device for particulate composite materials based on acoustic holography technology according to claim 1, characterized in that: The thickness of the acoustic holographic plate (8) satisfies the following formula: φ=arg(P c -P a )=π P a =and i(2πhf / va) P c =and i(2πhf / vc) Where φ represents the phase difference between the transmitted sound fields of the molten state unit and the crystalline state unit, and P a and P c denoted as the transmitted sound field of the molten state unit and the crystalline state unit respectively, arg() represents the phase of the complex number, h represents the thickness of the acoustic hologram plate (8), f represents the frequency of the ultrasonic waves emitted by the planar ultrasonic transducer (4), e represents the base of the natural logarithm, i represents the imaginary unit, and va and vc represent the sound velocity of the acoustic hologram plate (8) in the molten state unit and the crystalline state unit respectively.

4. The acoustic-assisted manufacturing device for particulate composite materials based on acoustic holography technology according to claim 1, characterized in that: Both the layer-by-layer curing platform lifting mechanism and the layer-by-layer curing platform lifting mechanism are slide rails.

5. A method for acoustic-assisted manufacturing of particulate composite materials based on acoustic holography using an auxiliary manufacturing apparatus as described in any one of claims 1-4, characterized in that, The method includes the following steps: S1. Add water to the water tank and the layer-by-layer curing platform (31) so that the distance between the water surface in the water tank and the acoustic holographic plate (8) is equal to the preset target sound field focal length. S2. Add a preset volume of a mixture containing microparticles into the mixing container (17), adjust the height of the mixing container (17) so that the water surface of the mixture in the mixing container (17) is level with the water surface in the water tank, and then adjust the height of the layer-by-layer curing platform (31) so that the lower surface of the layer-by-layer curing platform (31) contacts the water surface of the mixture. S3. The laser irradiation distribution pattern is obtained by processing and converting the target particle arrangement pattern. The laser projection module irradiates the acoustic hologram (8) with laser according to the laser irradiation distribution pattern. S4. Turn on the planar ultrasonic transducer (4) and the curing light source until the mixture containing microparticles is cured to obtain a curing layer with the target microparticle arrangement pattern. Raise the layer-by-layer curing platform (31) and drive the curing layer attached to the lower surface of the layer-by-layer curing platform (31) to rise synchronously. S5. Change the target particle arrangement pattern and repeat steps S2 to S4 until all preset target particle arrangement pattern curing layers are cured to obtain a molded part with all preset target particle arrangement patterns.

6. The acoustic-assisted manufacturing method for particulate composite materials based on acoustic holography technology according to claim 5, characterized in that: Step S3 specifically involves: S3.

1. Obtain the target sound pressure amplitude distribution by processing the preset target particle arrangement pattern; S3.

2. The phase distribution of the acoustic hologram plate (8) is obtained by processing the target sound pressure amplitude distribution using the iterative angular spectrum method. S3.

3. The phase distribution of the acoustic hologram (8) is binarized to obtain the laser irradiation distribution pattern; S3.4 The laser projection module irradiates the acoustic hologram (8) with laser according to the laser irradiation distribution pattern.

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