Ultraviolet-near infrared light synergistic additive manufacturing device and method

Abstract

The application relates to an ultraviolet light-near infrared light synergic additive manufacturing device and method, which comprises a displacement mechanism, a forming platform connected with the displacement mechanism, an ultraviolet material tank, a cleaning tank and a non-oxide ceramic material tank, the ultraviolet material tank, the cleaning tank and the near infrared material tank are arranged side by side along a preset direction and are all within the operation stroke range of the displacement mechanism, an ultraviolet light source is arranged correspondingly to the ultraviolet material tank, and a near infrared light source is arranged correspondingly to the near infrared material tank. The high-precision characteristics of ultraviolet light curing are used to layer by layer build a soluble resin shell as a sacrificial mold and temporary support, which not only ensures the part contour precision, but also realizes the forming of a cantilever structure, then the high penetration of near infrared light is used to realize the deep heat curing of high refractive index or high light absorption materials (non-oxide ceramics, metals, carbon-based materials and the like) layer by layer, and the mechanical, thermal, electrical and other performances of the workpiece are ensured, and the device has the dual advantages of shape control and property control.

Description

Technical Field

[0001] This invention relates to the technical field of additive manufacturing, and in particular to an ultraviolet-near-infrared light synergistic additive manufacturing apparatus and method. Background Technology

[0002] Non-oxide ceramics (such as SiC, Si3N4, AlN, etc.), metals (Ti, Ta, Ni, Cu, etc.), and carbon-based materials (carbon nanotubes, graphene, carbon fibers, etc.) are widely used in aerospace, integrated circuits, petrochemicals, nuclear industry, and biomedicine due to their excellent mechanical, thermal, and biological properties. Traditional forming methods have long production cycles and are difficult to use to fabricate parts with complex structures, such as complex flow channels and porous lattice structures, which cannot meet the development needs of various industries for next-generation high-performance parts.

[0003] Currently, photopolymerization 3D printing technology using ultraviolet light as a light source boasts excellent resolution and can achieve precise and controllable fabrication of intricate and complex structures. It has been widely applied to the controllable fabrication of complex structures in oxide ceramics, resins, and hydrogels. However, due to the high refractive index and strong light absorption properties of powders, non-oxide ceramics, metals, and carbon-based materials suffer from insufficient penetration depth of photopolymerization 3D printing technology using ultraviolet light as a light source, making it difficult to achieve high-performance curing and forming of complex structures in these materials. Summary of the Invention

[0004] The purpose of this invention is to provide an ultraviolet-near-infrared light synergistic additive manufacturing device, which aims to solve the problem of high-performance, high-precision, and controllable forming of complex structures with high refractive index or high absorbance materials.

[0005] According to one aspect of the present invention, an ultraviolet-near-infrared light co-additive manufacturing apparatus is provided, comprising:

[0006] Displacement mechanism;

[0007] A forming platform, which is connected to the shifting mechanism;

[0008] The ultraviolet material tank, the cleaning tank, and the near-infrared material tank are arranged side by side along a preset direction and are all within the operating stroke range of the shifting mechanism.

[0009] An ultraviolet light source, wherein the ultraviolet light source is correspondingly arranged with respect to the ultraviolet bath; and

[0010] A near-infrared light source is provided, and the near-infrared light source is correspondingly arranged with the near-infrared material tank.

[0011] In one embodiment, the shifting mechanism includes a frame, a horizontal motion module, and a vertical motion module. The horizontal motion module is disposed on the frame and configured to output a reciprocating force in the horizontal direction. The vertical motion module is disposed on the horizontal motion module and configured to output a lifting force in the vertical direction. The forming platform is connected to the vertical motion module.

[0012] In one embodiment, both the horizontal motion module and the vertical motion module include a base, a power source, and a transmission assembly. The power source is mounted on the base, and the transmission assembly is connected to the power output shaft of the power source. The transmission assembly is used to output linear reciprocating power.

[0013] In one embodiment, the ultraviolet-near-infrared light co-additive manufacturing apparatus further includes a centrifugal mechanism mounted on the vertical motion module, and the forming platform is connected to the centrifugal mechanism.

[0014] In one embodiment, the centrifugal mechanism includes a base, a centrifugal power source for outputting rotational driving force, and a clamping body. The base is connected to the vertical motion module, the centrifugal power source is mounted on the base, the clamping body is connected to the rotation shaft of the centrifugal power source, and the forming platform is detachably connected to the clamping body.

[0015] In one embodiment, the bottom wall of the ultraviolet material tank is provided with a first light-transmitting part, the ultraviolet light source is disposed below the bottom of the ultraviolet material tank, and the light-emitting part of the ultraviolet light source is disposed opposite to the first light-transmitting part.

[0016] In one embodiment, the bottom wall of the near-infrared material tank is provided with a second light-transmitting part, the near-infrared light source is disposed below the bottom of the near-infrared material tank, and the light-emitting part of the near-infrared light source is disposed opposite to the second light-transmitting part.

[0017] In one embodiment, the near-infrared material tank contains a high refractive index or high light-absorbing material, which is at least one of non-oxide ceramics, metals and carbon-based materials, with a solid content ≥40 vol% and a viscosity of 0.5-10 Pa•s, and contains a photothermal conversion medium that can absorb near-infrared light and convert it into heat, causing the high refractive index or high light-absorbing material to undergo a thermal polymerization crosslinking reaction.

[0018] The cleaning tank contains a cleaning solution, which includes at least one of ethanol, isopropanol, polyethylene glycol, and ethyl acetate.

[0019] The ultraviolet bath contains a soluble photosensitive resin solution that can undergo a polymerization and cross-linking reaction under ultraviolet light. The resin structure that has been cured by the reaction can be dissolved in a specific solution such as an alkaline solution, an acidic solution, or water.

[0020] In one embodiment, the ultraviolet light emitted by the ultraviolet light source has a wavelength of 365nm to 405nm; the near-infrared light emitted by the near-infrared light source has a wavelength of 808nm to 1064nm.

[0021] According to another aspect of the present invention, an additive manufacturing method for the ultraviolet-near-infrared light co-processed additive manufacturing apparatus as described above is provided, characterized by comprising the following steps:

[0022] S1: Pour the high refractive index or high light absorption material, soluble resin material, and cleaning liquid material into the corresponding near-infrared material tank, ultraviolet material tank, and cleaning tank, respectively;

[0023] S2: Design the sacrificial mold structure according to the model structure. The shifting mechanism drives the forming platform to move to the ultraviolet material tank. Under the action of ultraviolet light source, print N layers of soluble resin sacrificial mold.

[0024] S3: Then the shifting mechanism drives the forming platform to move upward, and then moves laterally to the cleaning tank, immersing the printed sacrificial mold in the cleaning solution. Low-speed centrifugation removes the residual soluble resin material on the sacrificial mold. Then the shifting mechanism drives the forming platform to lift to a certain height, so that the printed sacrificial mold leaves the cleaning solution and high-speed centrifugation removes the surface cleaning solution.

[0025] S4: After cleaning away the residual soluble resin material on the sacrificial mold, the shifting mechanism moves the forming platform to the near-infrared material tank, and prints a layer of high refractive index or high light absorption material structure under the action of near-infrared light source.

[0026] S5: The shifting mechanism drives the forming platform to move upward, and then moves to the cleaning tank, immersing the printed structure in the cleaning solution. Low-speed centrifugation removes the residual slurry. Then the shifting mechanism drives the forming platform to lift to a certain height, so that the printed structure leaves the cleaning solution. High-speed centrifugation removes the surface cleaning solution.

[0027] S6: Repeat steps S2 to S5 until a high refractive index or high light absorption material blank structure is printed inside the sacrificial mold.

[0028] S7: Remove the composite structure of the sacrificial mold and the high refractive index or high light absorption material blank, and then place it in an alkaline solution, acid solution or water to dissolve the outer sacrificial mold and obtain the high refractive index or high light absorption material blank structure.

[0029] S8: The high refractive index or high light absorption material of the blank structure after removing the sacrificial mold is degreased and sintered in the degreasing furnace and sintering furnace respectively to obtain the corresponding dense parts.

[0030] Implementing the embodiments of the present invention will have the following beneficial effects:

[0031] This solution combines high-penetration near-infrared photothermal curing and high-resolution ultraviolet curing technologies. By curing high-precision soluble resin contour structures with ultraviolet light and high-refractive-index or high-absorption materials with near-infrared light, it enables high-precision, high-performance photopolymerization 3D printing of complex structures, including but not limited to non-oxide ceramics (silicon carbide, tungsten carbide, silicon nitride, aluminum nitride, titanium boride, calcium boride, etc.), metals (tantalum, titanium, nickel, copper, etc.), and carbon-based materials (carbon nanotubes, graphene, carbon fibers, graphite, etc.). Furthermore, the high-precision soluble resin contour structures cured by ultraviolet light in this solution can not only serve as a precise shape control method... The outline can also serve as a temporary support, enabling 3D printing of complex cantilever, hollow, or even complex assembly structures made of high-refractive-index or high-light-absorbing materials, without leaving any support structure on the surface. Finally, this solution addresses the significant difference in curing depth between near-infrared thermosetting and ultraviolet curing, where near-infrared thermosetting depth is generally significantly higher than ultraviolet curing depth. By designing a printing process of "N layers (N≥1) of ultraviolet curing corresponding to 1 layer of near-infrared thermosetting," the solution ensures forming accuracy while significantly reducing the time cost of switching between forming platforms, thus improving forming efficiency. Attached Figure Description

[0032] 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.

[0033] Figure 1 This is a schematic diagram of the ultraviolet-near-infrared light co-additive manufacturing apparatus during the curing and forming of a sacrificial mold in one embodiment.

[0034] Figure 2 A schematic diagram of a structure for cleaning a sacrificial mold in a cleaning tank;

[0035] Figure 3 A schematic diagram of a structure for cleaning the sacrificial mold after it has been removed from the cleaning tank and is then performed by a centrifugal mechanism.

[0036] Figure 4 This is a schematic diagram of a high-refractive-index or high-light-absorbing material preform solidified inside a sacrificial mold in another embodiment.

[0037] Figure 5 A schematic diagram of a structure for cleaning a sacrificial mold together with a preform made of a high-refractive-index or high-light-absorbing material in a cleaning tank;

[0038] Figure 6 A schematic diagram of a structure in which the sacrificial mold and the blank made of high refractive index or high light absorption material are removed from the cleaning tank and then cleaned by a centrifugal mechanism;

[0039] Figure 7 This is a flowchart illustrating the steps of an additive manufacturing method using an ultraviolet-near-infrared light co-processed additive manufacturing apparatus according to an embodiment.

[0040] in:

[0041] 100. Ultraviolet-Near Infrared Co-processing Additive Manufacturing Device; 10. Shifting Mechanism; 11. Horizontal Motion Module; 12. Vertical Motion Module; 20. Forming Platform; 30. Ultraviolet Material Tank; 31. First Light-Transmitting Section; 40. Cleaning Tank; 50. Near Infrared Material Tank; 51. Second Light-Transmitting Section; 60. Ultraviolet Light Source; 70. Near Infrared Light Source; 80. Centrifugal Mechanism; 200. Sacrificial Mold; 300. High Refractive Index or High Light Absorption Material Blank. Detailed Implementation

[0042] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0043] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0045] Please refer to Figures 1-6 This refers to an ultraviolet-near-infrared light co-additive manufacturing apparatus 100 as described in one embodiment. Specifically, Figure 1 This is a schematic diagram of the ultraviolet-near-infrared light co-additive manufacturing apparatus during the curing and forming of a sacrificial mold in one embodiment. Figure 2 A schematic diagram of a structure for cleaning a sacrificial mold in a cleaning tank; Figure 3 A schematic diagram of a structure for cleaning the sacrificial mold after it has been removed from the cleaning tank and is then performed by a centrifugal mechanism. Figure 4 This is a schematic diagram of a high-refractive-index or high-light-absorbing material preform solidified inside a sacrificial mold in another embodiment. Figure 5 A schematic diagram of a structure for cleaning a sacrificial mold together with a preform made of a high-refractive-index or high-light-absorbing material in a cleaning tank; Figure 6 A schematic diagram of a structure in which the sacrificial mold and the blank made of high refractive index or high light absorption material are removed from the cleaning tank and then cleaned by a centrifugal mechanism.

[0046] The ultraviolet-near-infrared light co-additive manufacturing apparatus 100 includes a shifting mechanism 10, a forming platform 20, an ultraviolet material tank 30, a cleaning tank 40, a near-infrared material tank 50, an ultraviolet light source 60, and a near-infrared light source 70.

[0047] The forming platform 20 is connected to the shifting mechanism 10. Therefore, the forming platform 20 can be installed and positioned by the shifting mechanism 10, and can move freely within the space provided by the shifting mechanism 10.

[0048] The ultraviolet material tank 30, the cleaning tank 40, and the near-infrared material tank 50 are arranged side by side along a preset direction and are all within the operating stroke range of the shifting mechanism 10. Specifically, the shifting mechanism 10 has a length direction extending horizontally. The ultraviolet material tank 30, the cleaning tank 40, and the near-infrared material tank 50 are arranged side by side at intervals along the length direction of the shifting mechanism 10. The cleaning tank 40 is located between the ultraviolet material tank 30 and the near-infrared material tank 50, which facilitates switching back and forth between cleaning and additive manufacturing processes.

[0049] For example, the ultraviolet material tank 30, the cleaning tank 40 and the near-infrared material tank 50 are all box structures with openings at the top. The openings facilitate the entry and exit of the forming platform 20 into each tank.

[0050] Furthermore, the ultraviolet material tank 30, the cleaning tank 40, and the near-infrared material tank 50 can be set up independently or integrated on the same mounting base, and can be flexibly selected as needed.

[0051] Please see Figure 1 An ultraviolet light source 60 is correspondingly arranged with an ultraviolet bath 30 to provide ultraviolet light to the soluble resin material within the ultraviolet bath 30. A near-infrared light source 70 is correspondingly arranged with a near-infrared bath 50 to provide near-infrared light to high-refractive-index or high-absorption materials within the near-infrared bath 50.

[0052] Optionally, in one embodiment, the ultraviolet light emitted by the ultraviolet light source 60 has a wavelength of 365 nm to 405 nm; and / or, the near-infrared light emitted by the near-infrared light source 70 has a wavelength of 808 nm to 1064 nm. Thus, the ultraviolet light within the aforementioned wavelength range can meet the processing requirements of this application for curing soluble resin materials with ultraviolet light to form the sacrificial mold 200; the near-infrared light within the aforementioned wavelength range can meet the processing requirements of this application for curing non-oxide ceramic slurry with near-infrared light to form a green body 300 of high refractive index or high light absorption material.

[0053] Implementing the embodiments of the present invention will have the following beneficial effects: When the ultraviolet-near-infrared light synergistic additive manufacturing apparatus 100 of this solution operates based on the additive manufacturing method, the shifting mechanism 10 first immerses the forming platform 20 into the ultraviolet material tank 30, and then the ultraviolet light source 60 is turned on and irradiates the ultraviolet material tank 30 with ultraviolet light, so that the soluble resin material is cured on the forming platform 20 to form a soluble sacrificial mold 200. Since ultraviolet curing has the characteristics of high precision, the soluble sacrificial mold 200 has a high-precision part contour, which helps to ensure the forming accuracy of subsequent high refractive index or high light absorption material parts; then, the shifting mechanism 10 removes the forming platform 20 from the ultraviolet material tank 30 and transfers it to the cleaning area. In the tank 40, the soluble resin material remaining on the surface of the sacrificial mold 200 is cleaned and removed. Then, the shifting mechanism 10 moves the forming platform 20 and the sacrificial mold 200 on it and immerses them in the near-infrared material tank 50. Immediately afterwards, the near-infrared light source 70 is turned on and near-infrared light is irradiated into the near-infrared material tank 50. Utilizing the high penetrability of near-infrared light, a high refractive index or high light-absorbing material structure can be formed in the sacrificial mold 200. Then, the above processing steps are continuously repeated until a high refractive index or high light-absorbing material blank 300 composed of a multi-layer non-oxide ceramic structure is formed in the sacrificial mold 200. Finally, the sacrificial mold 200 is cleaned and removed to obtain the desired dense ceramic part. This solution first utilizes the high precision characteristics of ultraviolet light curing to construct a soluble resin shell sacrificial mold 200, i.e., the part outline, ensuring the accuracy of the part outline. Then, it utilizes the high penetration of near-infrared light to achieve deep thermal curing of high refractive index or high light absorption materials, ensuring the mechanical, thermal, and electrical properties of the part, and possessing the dual advantages of shape control and property control.

[0054] In one embodiment, the shifting mechanism 10 includes a frame, a horizontal motion module 11 and a vertical motion module 12. The horizontal motion module 11 is disposed on the frame and configured to output a reciprocating force in the horizontal direction. The vertical motion module 12 is disposed on the horizontal motion module 11 and configured to output a lifting force in the vertical direction. The forming platform 20 is connected to the vertical motion module 12.

[0055] As is easily understood, the frame serves as the main supporting component of the shifting mechanism 10, used to load and integrate the horizontal motion module 11 and the vertical motion module 12. The horizontal motion module 11 outputs reciprocating force in the horizontal direction (i.e., the length direction of the shifting mechanism 10), enabling the vertical motion module 12 and the forming platform 20 to move and switch between the ultraviolet material tank 30, the cleaning tank 40, and the near-infrared material tank 50, achieving precise alignment between the forming platform 20 and each tank. The vertical motion module 12 provides vertical lifting force to the forming platform 20, allowing it to immerse or withdraw materials from the ultraviolet material tank 30, the cleaning tank 40, and the near-infrared material tank 50. The shifting mechanism 10 has a simple structure and working principle, fast response speed, and high reliability.

[0056] Since both the horizontal motion module 11 and the vertical motion module 12 are used to output linear telescopic driving force, they can adopt the same structural design to reduce design, manufacturing, and subsequent maintenance costs. Therefore, in a specific embodiment, both the horizontal motion module 11 and the vertical motion module 12 include a base, a power source, and a transmission assembly. The power source is mounted on the base, and the transmission assembly is connected to the power output shaft of the power source. The transmission assembly is used to output linear reciprocating power.

[0057] The base of the horizontal motion module 11 is connected to the frame, while the base of the vertical motion module 12 is connected to the transmission assembly of the horizontal motion module 11, and the transmission assembly of the vertical motion module 12 is connected to the forming platform 20. During operation, the power source of the horizontal motion module 11 outputs linear telescopic driving force to the transmission assembly, which drives the entire vertical motion module 12 to move back and forth in the horizontal direction, allowing the forming platform 20 to flexibly switch between different tanks. The power source of the vertical motion module 12 outputs linear telescopic driving force to the transmission assembly, which drives the forming platform 20 to rise or fall in the vertical direction, allowing the forming platform 20 to immerse or withdraw material from each tank.

[0058] For example, the power source can be any of the following: an electric motor, a cylinder, etc. When the power source is an electric motor, the transmission component is a lead screw and nut assembly; when the power source is a cylinder, the transmission component is a guide rail and slider assembly, and so on.

[0059] Please see Figure 3 and Figure 6In one embodiment, the ultraviolet-near-infrared co-processing additive manufacturing apparatus 100 further includes a centrifugal mechanism 80, which is mounted on the vertical motion module 12. The forming platform 20 is connected to the centrifugal mechanism 80. By adding the centrifugal mechanism 80 between the vertical motion module and the forming platform 20, the forming platform 20 can rise and exit from the ultraviolet material tank 30 and the near-infrared material tank 50, and then enter the cleaning tank 40. First, the forming platform 20 is driven to clean at 10 r / min-50 r / min for 2s-15s to remove residual soluble resin material and non-oxide ceramic slurry. Then, the vertical motion module 12 drives the forming platform 20 to rise and exit from the cleaning tank 40, and the centrifugal mechanism 80 then centrifuges at a speed of 300 r / min-2000 r / min to thoroughly remove the residual cleaning liquid, ensuring the cleanliness of the sacrificial mold 200 and the ceramic blank and the forming quality.

[0060] For example, in one embodiment, the centrifugal mechanism 80 includes a base, a centrifugal power source for outputting rotational driving force, and a clamping body. The base is connected to the vertical motion module 12, the centrifugal power source is mounted on the base, the clamping body is connected to the rotation shaft of the centrifugal power source, and the forming platform 20 is detachably connected to the clamping body. During installation, the base is used to connect with the transmission assembly for vertical motion to achieve overall assembly and fixation of the centrifugal mechanism 80 with the vertical motion module 12. The centrifugal power source outputs rotational power to the clamping body to drive the forming platform 20 to rotate, thereby removing residual materials (soluble resin materials or non-oxide ceramic slurry) from the sacrificial mold 200 and / or the high-refractive-index or high-light-absorbing material blank 300.

[0061] Alternatively, the centrifugal power source can be a drive device that can directly output rotational power, such as a rotary motor, or a drive device that can convert linear power into rotational power; the choice can be made as needed.

[0062] The fixture body is an electrically controlled fixture, including a fixture base, on which a two-way cylinder is installed. The first piston rod of the two-way cylinder is connected to a first gripper, and the second piston rod of the two-way cylinder is connected to a second gripper. The forming platform 20 is provided with a mating column. The two-way cylinder drives the first gripper and the second gripper to close towards each other and clamp the mating column, thereby realizing the fixture body clamping and fixing the forming platform 20.

[0063] Furthermore, the outer circumferential surface of the mating column is machined with a first tooth-like structure, and the clamping surface of the first and / or second jaws is designed and machined with a second tooth-like structure. The second tooth-like structure and the first tooth-like structure adopt a conformal fitting design. By means of the interlocking of the first tooth-like structure and the second tooth-like structure, an anti-slip and anti-loosening effect is achieved, thereby improving the firmness and reliability of the clamping body and the mating column.

[0064] Please see Figure 1In one embodiment, the bottom wall of the ultraviolet material tank 30 is provided with a first light-transmitting part 31, and the ultraviolet light source 60 is disposed below the bottom of the ultraviolet material tank 30, with the light-emitting part of the ultraviolet light source 60 opposite to the first light-transmitting part 31. For example, the first light-transmitting part 31 is a light-transmitting glass plate or acrylic plate, and the bottom wall of the ultraviolet material tank 30 is provided with a first installation window. The glass plate or acrylic plate is sealed and installed at the first installation window by a first sealing ring. The glass plate or acrylic plate allows the ultraviolet light emitted by the ultraviolet light source 60 to penetrate into the soluble resin material tank, so as to act on the soluble resin material contained in the tank, so as to solidify the soluble resin material into a soluble sacrificial mold 200.

[0065] In one embodiment, the bottom wall of the near-infrared material tank 50 is provided with a second light-transmitting part 51, and the near-infrared light source 70 is disposed below the bottom of the near-infrared material tank 50, with the light-emitting part of the near-infrared light source 70 opposite to the second light-transmitting part 51. Similarly, the second light-transmitting part 51 is a light-transmitting glass plate or acrylic plate, and the bottom wall of the near-infrared material tank 50 is provided with a second installation window. The glass plate or acrylic plate is sealed and installed at the second installation window by a second sealing ring. The glass plate or acrylic plate allows the near-infrared light emitted by the near-infrared light source 70 to be transmitted into the near-infrared material tank 50 to act on the non-oxide ceramic slurry contained in the tank, so that the non-oxide ceramic slurry is solidified and formed into a high-refractive-index or high-light-absorbing material blank 300.

[0066] For example, in this application, the near-infrared material tank 50 contains a non-oxide ceramic slurry, which includes at least one of silicon carbide, tungsten carbide, silicon nitride, aluminum nitride, titanium boride, and calcium boride, with a solid content ≥40 vol%, a viscosity of 0.5-10 Pa•s, and contains a photothermal conversion medium. This configuration results in excellent physicochemical properties of the non-oxide ceramic slurry, making it more conducive to the curing of the slurry into a high-refractive-index or high-absorption green body 300 under near-infrared light irradiation.

[0067] And / or, in one embodiment, the cleaning solution tank contains a cleaning solution, which includes at least one of ethanol, 75% alcohol, isopropanol, polyethylene glycol, etc. This allows the cleaning solution to effectively clean and remove residual soluble resin material or non-oxide ceramic slurry from the sacrificial mold 200 and / or the ceramic blank.

[0068] like Figure 7 As shown, in a second aspect, this application also proposes an additive manufacturing method for the ultraviolet-near-infrared light co-processing additive manufacturing apparatus 100 as described in any of the above embodiments, comprising the following steps:

[0069] S1: Pour the high refractive index or high light absorption material, soluble resin material, and cleaning liquid material into the corresponding near-infrared material tank 50, ultraviolet material tank 30, and cleaning tank 40 respectively.

[0070] S2: Design the sacrificial mold 200 structure according to the model structure. The shifting mechanism 10 drives the forming platform 20 to move to the ultraviolet material tank 30. Under the action of the ultraviolet light source 60, print N layers of soluble resin sacrificial mold.

[0071] S3: Then the shifting mechanism 10 drives the forming platform 20 to move upward, and then moves laterally to the cleaning tank 40, immersing the printed sacrificial mold in the cleaning solution, and centrifuging at low speed to clean away the residual soluble resin material on the sacrificial mold. Then the shifting mechanism 10 drives the forming platform 20 to lift to a certain height, so that the printed sacrificial mold leaves the cleaning solution, and centrifuging at high speed removes the surface cleaning solution.

[0072] S4: After cleaning away the residual soluble resin material on the sacrificial mold, the shifting mechanism 10 drives the forming platform 20 to move to the near-infrared material tank 50, and prints a layer of high refractive index or high light absorption material structure under the action of the near-infrared light source 70.

[0073] S5: The shifting mechanism 10 drives the forming platform 20 to move upward, and then moves to the cleaning tank 40, immersing the printed structure in the cleaning solution. The residual paste is cleaned away by low-speed centrifugation. Then the shifting mechanism 10 drives the forming platform 20 to lift to a certain height, so that the printed structure leaves the cleaning solution and the surface cleaning solution is removed by high-speed centrifugation.

[0074] S6: Repeat steps S2 to S5 until the high refractive index or high light absorption material blank 300 structure is printed inside the sacrificial mold.

[0075] S7: Remove the composite structure of the sacrificial mold and the high refractive index or high light absorption material blank 300 structure, and then place it in an alkaline solution, acid solution or water to dissolve the outer sacrificial mold to obtain the high refractive index or high light absorption material blank 300 structure.

[0076] S8: The high refractive index or high light absorption material of the blank 300 structure, after removing the sacrificial mold, is degreased and sintered in a degreasing furnace and a sintering furnace respectively to obtain the corresponding dense parts.

[0077] In this scheme, the ultraviolet-near-infrared light synergistic additive manufacturing apparatus 100 operates based on the additive manufacturing method. First, the transfer mechanism 10 immerses the forming platform 20 into the ultraviolet bath 30. Then, the ultraviolet light source 60 is turned on and irradiates the ultraviolet bath 30 with ultraviolet light, causing the soluble resin material to solidify on the forming platform 20 to form a soluble sacrificial mold 200. Because ultraviolet curing has high precision characteristics, the soluble sacrificial mold 200 has a high-precision part contour, which helps to ensure the forming accuracy of subsequent ceramic parts. Next, the transfer mechanism 10 removes the forming platform 20 from the ultraviolet bath 30 and transfers it to the cleaning tank 40, where the sacrificial mold... The soluble resin material remaining on the surface of the mold 200 is cleaned and removed. Then, the shifting mechanism 10 moves the forming platform 20 and its sacrificial mold 200 into the near-infrared bath 50. Next, the near-infrared light source 70 is turned on and irradiates the near-infrared bath 50 with near-infrared light. Utilizing the high penetrability of near-infrared light, a layer of non-oxide ceramic slurry is formed in the sacrificial mold 200. This process is repeated until a high-refractive-index or high-absorption green body 300 composed of multiple layers of non-oxide ceramic structure is formed in the sacrificial mold 200. Finally, the sacrificial mold 200 is cleaned and removed to obtain the desired dense ceramic part. This solution first utilizes the high precision of ultraviolet curing to construct the soluble resin shell sacrificial mold 200, i.e., the part outline, ensuring the accuracy of the part outline. Then, the high penetrability of near-infrared light is used to achieve deep thermal curing of the silicon carbide slurry, ensuring the mechanical properties of the silicon carbide ceramic, thus possessing the dual advantages of shape and property control.

[0078] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A device for synergistic additive manufacturing of ultraviolet-near infrared light, characterized in that, include: Displacement mechanism; A forming platform, which is connected to the shifting mechanism; The ultraviolet material tank, the cleaning tank, and the near-infrared material tank are arranged side by side along a preset direction and are all within the operating stroke range of the shifting mechanism. An ultraviolet light source is provided, which is correspondingly arranged with respect to the ultraviolet material tank; and a near-infrared light source is provided, which is correspondingly arranged with respect to the near-infrared material tank.

2. The ultraviolet-near-infrared light synergistic additive manufacturing apparatus according to claim 1, characterized in that, The shifting mechanism includes a frame, a horizontal motion module, and a vertical motion module. The horizontal motion module is mounted on the frame and configured to output a reciprocating force in the horizontal direction. The vertical motion module is mounted on the horizontal motion module and configured to output a lifting force in the vertical direction. The forming platform is connected to the vertical motion module.

3. The ultraviolet-near-infrared light synergistic additive manufacturing apparatus according to claim 2, characterized in that, Both the horizontal motion module and the vertical motion module include a base, a power source, and a transmission assembly. The power source is mounted on the base, and the transmission assembly is connected to the power output shaft of the power source. The transmission assembly is used to output linear reciprocating power.

4. The ultraviolet-near-infrared light synergistic additive manufacturing apparatus according to claim 2, characterized in that, The ultraviolet-near-infrared light co-additive manufacturing device also includes a centrifugal mechanism, which is mounted on the vertical motion module, and the forming platform is connected to the centrifugal mechanism.

5. The ultraviolet-near-infrared light synergistic additive manufacturing apparatus according to claim 3, characterized in that, The centrifugal mechanism includes a base, a centrifugal power source for outputting rotational driving force, and a clamping body. The base is connected to the vertical motion module, the centrifugal power source is mounted on the base, the clamping body is connected to the rotation shaft of the centrifugal power source, and the forming platform is detachably connected to the clamping body.

6. The ultraviolet-near-infrared light synergistic additive manufacturing apparatus according to claim 1, characterized in that, The bottom wall of the ultraviolet material tank is provided with a first light-transmitting part, and the ultraviolet light source is located below the bottom of the ultraviolet material tank, with the light-emitting part of the ultraviolet light source being arranged opposite to the first light-transmitting part.

7. The ultraviolet-near-infrared light synergistic additive manufacturing apparatus according to claim 1, characterized in that, The bottom wall of the near-infrared material tank is provided with a second light-transmitting part, and the near-infrared light source is located below the bottom of the near-infrared material tank, with the light-emitting part of the near-infrared light source being arranged opposite to the second light-transmitting part.

8. The ultraviolet-near-infrared light synergistic additive manufacturing apparatus according to claim 1, characterized in that, The near-infrared material tank contains a high refractive index or high light-absorbing material, which is at least one of non-oxide ceramics, metals and carbon-based materials, with a solid content ≥40 vol% and a viscosity of 0.5-10 Pa•s, and contains a photothermal conversion medium. The photothermal conversion medium can absorb near-infrared light and convert it into heat, causing the high refractive index or high light-absorbing material to undergo a thermal polymerization crosslinking reaction. The cleaning tank contains a cleaning solution, which includes at least one of ethanol, isopropanol, polyethylene glycol, and ethyl acetate; the ultraviolet tank contains a soluble photosensitive resin solution that can undergo a polymerization and cross-linking reaction under ultraviolet light, and the resin structure that has been cured by the reaction can be dissolved in a specific solution of alkaline solution, acid solution, or water.

9. The ultraviolet-near-infrared light synergistic additive manufacturing apparatus according to claim 1, characterized in that, The ultraviolet light emitted by the ultraviolet light source has a wavelength of 365nm~405nm; the near-infrared light emitted by the near-infrared light source has a wavelength of 808nm~1064nm.

10. An additive manufacturing method using the ultraviolet-near-infrared light co-processing additive manufacturing apparatus as described in any one of claims 1 to 9, characterized in that, Includes the following steps: S1: Pour the high refractive index or high light absorption material, soluble resin material, and cleaning liquid material into the corresponding near-infrared material tank, ultraviolet material tank, and cleaning tank, respectively; S2: Design the sacrificial mold structure according to the model structure. The shifting mechanism drives the forming platform to move to the ultraviolet material tank. Under the action of ultraviolet light source, print N layers of soluble resin sacrificial mold. S3: Then the shifting mechanism drives the forming platform to move upward, and then moves laterally to the cleaning tank, immersing the printed sacrificial mold in the cleaning solution. Low-speed centrifugation removes the residual soluble resin material on the sacrificial mold. Then the shifting mechanism drives the forming platform to lift to a certain height, so that the printed sacrificial mold leaves the cleaning solution and high-speed centrifugation removes the surface cleaning solution. S4: After cleaning away the residual soluble resin material on the sacrificial mold, the shifting mechanism moves the forming platform to the near-infrared material tank, and prints a layer of high refractive index or high light absorption material structure under the action of near-infrared light source. S5: The shifting mechanism drives the forming platform to move upward, and then moves to the cleaning tank, immersing the printed structure in the cleaning solution. Low-speed centrifugation removes the residual slurry. Then the shifting mechanism drives the forming platform to lift to a certain height, so that the printed structure leaves the cleaning solution. High-speed centrifugation removes the surface cleaning solution. S6: Repeat steps S2 to S5 until a high refractive index or high light absorption material blank structure is printed inside the sacrificial mold. S7: Remove the composite structure of the sacrificial mold and the high refractive index or high light absorption material blank, and then place it in an alkaline solution, acid solution or water to dissolve the outer sacrificial mold and obtain the high refractive index or high light absorption material blank structure. S8: The high refractive index or high light absorption material of the blank structure after removing the sacrificial mold is degreased and sintered in the degreasing furnace and sintering furnace respectively to obtain the corresponding dense parts.

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