Disc coating sinking type multi-material 3D printing device

Abstract

The invention discloses a disc coating sinking type multi-material 3D printing device, belongs to the technical field of 3D printing, and particularly relates to the disc coating sinking type multi-material 3D printing device. The invention aims to solve the technical problem of printing errors caused by non-uniform material accumulation at present. The device comprises a disc mechanism, a coating system, a photocuring system, a scraper gravity recovery system, a motor, a control system, a shell and a storage barrel, the motor and the control system are arranged at the center axis position of the shell. The disc mechanism is arranged at the top of the shell and connected with the motor through screws. The coating system, the scraper gravity recovery system and the storage barrel are arranged in the shell around a middle shaft of the shell; the photocuring system is arranged on the upper portion of the shell. A plurality of different coating areas and material supply systems are arranged, so that switching and combination of various materials are conveniently realized; and meanwhile, limitation of the size of a traditional plane type printing platform is avoided, large-size 3D printing can be achieved, and the manufacturing requirements of some large parts are met.

Description

Technical Field

[0001] The present invention belongs to the technical field of 3D printing, and in particular relates to a disc-coated sinking multi-material 3D printing device. Background Art

[0002] With the rapid advancement of technology, 3D printing technology, leveraging its unique manufacturing advantages, has been widely applied in numerous fields, including aerospace, healthcare, automotive, and construction. In aerospace, it is used to manufacture lightweight components with complex internal structures, reducing aircraft weight and improving performance. In healthcare, it allows for customized medical devices and implants to meet specific patient needs. The automotive industry allows for rapid prototyping of components, accelerating R&D. In the construction industry, it can print architectural models and even small building components to aid design and construction. As the application scenarios of 3D printing continue to expand, the performance requirements for printing devices are becoming increasingly stringent. Existing 3D printing devices present a series of pressing challenges when handling multiple materials. Regarding material switching, some devices lack optimal design, resulting in poor coordination between their mechanical structure and material supply system. This requires meticulous manual disassembly and replacement of consumable containers and related connecting components when switching between different materials. This process is not only time-consuming and reduces production efficiency, but also, during frequent operation, dust and impurities can easily enter the printed material. These impurities can interfere with the proper curing and deposition of the material during printing, causing defects and reduced strength in the final product, seriously impacting print quality. At the same time, some printing devices have obvious defects in the effect of multi-material mixed printing. They lack a precise material mixing control mechanism and it is difficult to achieve uniform mixing of multiple materials at the microscopic level. For complex structural components with functional gradient requirements, that is, different areas of the component need to have different properties (such as hardness, strength, conductivity, etc.), existing devices cannot accurately distribute and fuse multiple materials, resulting in the printed components failing to meet the expected functional requirements. In addition, the traditional planar 3D printing platform is limited by its own structure and has a bottleneck in printing size. For large parts, such as large blades of aircraft engines and large molds of automobiles, traditional platforms cannot complete printing in one go and can only use block printing and then splicing. This method not only increases the complexity of the process, but also easily causes gaps and inconsistent strength at the splicing points, making it difficult to meet the high-quality manufacturing requirements of large parts. Therefore, in order to meet the growing demand for multi-material printing, there is an urgent need to design a device that can achieve multi-material printing efficiently and accurately. Summary of the Invention

[0003] The purpose of the present invention is to solve the current technical problem of printing errors caused by uneven material stacking, and by setting up multiple different coating areas and material supply systems, it is possible to easily switch and combine multiple materials; at the same time, it is not limited by the size of traditional flat printing platforms, and can achieve larger-scale 3D printing to meet the manufacturing needs of some large parts. A disc-coated sinking multi-material 3D printing device is proposed.

[0004] The disc-coating sinking multi-material 3D printing device of the present invention includes a disc mechanism, a coating system, a light-curing system, a scraper gravity recovery system, a motor, a control system, a housing and a storage barrel; the motor and control system are arranged at the central axis position of the housing, the disc mechanism is arranged at the top of the housing and connected to the motor by screws, and the motor provides power output to the disc mechanism through a rotating shaft; the coating system, scraper gravity recovery system and storage barrel are arranged in the housing around the central axis; the light-curing system is arranged on the upper part of the housing; the control system is respectively connected to the coating system, light-curing system, scraper gravity recovery system and motor electrical signals.

[0005] Furthermore, the disc mechanism includes a circular transparent glass plate and a glass plate clamp; the glass plate clamp is symmetrically arranged up and down and fastened to both sides of the circular transparent glass plate.

[0006] Furthermore, the coating system includes a coating head, a coating lifting shell, a coating system support body and a coating lifting shaft; the coating lifting shaft is arranged on the upper part of the coating system support body, and the coating lifting shell is slidably arranged on the outside of the coating lifting shaft. The coating head is fixed to the upper end of the coating lifting shell, and the coating head is connected to the storage barrel 7 through a transmission pipe.

[0007] Furthermore, the number of the coating systems is 2 to n, and they are evenly distributed below the circular transparent glass plate with the central axis of the shell as the center.

[0008] Furthermore, the coating head adopts a micro-needle structure, and the minimum coating diameter is 0.1 mm.

[0009] Furthermore, the photocuring system includes a UV optical machine laser head, an optical machine telescopic arm, an optical machine lifting shaft, an optical machine support body and an optical machine lifting shaft tension adjustment part; the optical machine lifting shaft is slidably arranged on the side of the optical machine support body, the optical machine telescopic arm is fixed on the optical machine lifting shaft, and the end of the optical machine telescopic arm is horizontally extended relative to the optical machine support body; the UV optical machine laser head is fixed to the end of the optical machine telescopic arm through a universal joint; and the optical machine lifting shaft tension adjustment part is provided at the upper end of the optical machine support body.

[0010] Furthermore, the number of the light curing systems is 1 to n, and the UV light machine laser head emits ultraviolet light with a wavelength of 365 nm.

[0011] Furthermore, the scraper gravity recovery system includes a scraper lifting shaft, a scraper lifting shell, a scraper system support body, a slurry recovery trough, a fixing screw plate and a scraper; the scraper lifting shaft is arranged on the upper part of the scraper system support body, and the scraper lifting shell is slidably arranged on the outside of the scraper lifting shaft; the slurry recovery trough is fixed at the upper end of the scraper lifting shell, and the scraper is vertically fixed in the middle position of the slurry recovery trough by a fixing screw plate; the storage barrel is connected to the slurry recovery trough through a recovery pipe.

[0012] Furthermore, a printing platform is provided in the shell and is made of an aluminum alloy flat plate.

[0013] Furthermore, the specific operation process of the disc coating sinking multi-material 3D printing device is carried out as follows:

[0014] 1. Model preprocessing: The 3D model file to be printed is imported into the control system. The slicing software in the control system slices the model, cutting it vertically into multiple layers of 2D cross-sectional data. Each layer of cross-sectional data is divided into multiple printing areas based on the material requirements and structural characteristics of the model, and the corresponding material and printing parameters are specified for each printing area.

[0015] 2. Coating and curing process: After starting the device, the disc mechanism begins to rotate at a constant speed according to the set initial speed; according to the material information of the first layer of two-dimensional cross-sectional data obtained by slicing, the control system controls the corresponding coating head to work, so that the material chamber inside it is connected to the slurry recovery tank; under the action of pressure, the material is evenly coated on the corresponding position on the surface of the disc mechanism through the micro-needle array discharge port of the coating head; during the coating process, the control system accurately controls the material outflow and coating time of the coating head according to the preset coating thickness and the rotation speed of the disc mechanism to ensure the formation of a uniform material layer; when a layer of material is coated, the disc mechanism continues to rotate to coat the coated The area is brought into the light curing area; the coated material layer is irradiated according to the pre-set irradiation angle and intensity, so that the material is quickly cured and formed. After each layer is cured, the printing platform descends, the disc mechanism rotates to the coating area, and the scraper gravity recovery system rises to recover the uncured material liquid in the printing area; during the curing process, the control system adjusts the irradiation time and intensity of the light machine in real time according to the optical properties of the material and printing requirements to ensure that the material is fully cured; after completing the coating and curing of the first layer, the control system switches the coating head according to the material information of the second layer cross-section data and repeats the above coating and curing steps, stacking the printed material layer by layer until the entire model is printed;

[0016] 3. Support structure processing: During the printing process, for overhanging parts or complex structures in the model, the control system will automatically generate support structure data based on the model's geometry and stress conditions; the support structure will be sliced ​​together with the rest of the model and printed synchronously with other materials during the printing process.

[0017] The present invention has the following beneficial effects:

[0018] This invention evenly applies printing material to the surface of a rotating disc, constructing a three-dimensional object through layer-by-layer stacking. A highly efficient material supply device is designed to precisely control the amount and position of different materials, ensuring uniform and stable material coating on the disc surface. This solves the current technical problem of printing errors caused by uneven material stacking. By setting up multiple coating areas and a material supply system, it facilitates switching and combining multiple materials. Furthermore, it is not limited by the size of traditional flat printing platforms, enabling larger-scale 3D printing to meet the manufacturing needs of some large components. It also achieves high printing precision, large print sizes, and facilitates switching between multiple materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the overall diagram of the disc coating multi-material 3D printing device;

[0020] Figure 2 This is the main view of the scraper gravity recovery system;

[0021] Figure 3 This is a side view of the scraper gravity recovery system;

[0022] Figure 4 This is a top view of the scraper gravity recovery system;

[0023] Figure 5 This is the main view of the coating system;

[0024] Figure 6 It is a side view of the coating system;

[0025] Figure 7 It is a top view of the coating system;

[0026] Figure 8 This is the main view of the light curing system;

[0027] Figure 9 This is a side view of the light curing system;

[0028] Figure 10 This is a top view of the light curing system. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is not limited to the specific implementation methods listed below, but also includes any reasonable combination of the specific implementation methods.

[0030] Specific embodiment one: The disc coating sinking multi-material 3D printing device in this embodiment includes a disc mechanism 1, a coating system 2, a light curing system 3, a scraper gravity recovery system 4, a motor 5, a control system, a shell 6 and a storage barrel 7; the motor 5 and the control system are arranged at the central axis position of the shell, the disc mechanism 1 is arranged on the top of the shell 6 and is connected to the motor 5 by screws, and the motor 5 provides power output to the disc mechanism 1 through the rotating shaft; the coating system 2, the scraper gravity recovery system 4 and the storage barrel 7 are arranged in the shell 6 around the central axis of the shell 6; the light curing system 3 is arranged on the upper part of the shell 6; the control system is connected to the coating system 2, the light curing system 3, the scraper gravity recovery system 4 and the motor 5 with electrical signals respectively.

[0031] The control system uses a motor to drive the material feed, extracting the light-curing slurry from the storage barrel and delivering it to the coating head through a transmission pipe. Under the precise control of the motor control system, the coating head evenly applies the slurry to the designated printing area with the set thickness and shape, forming the first printing layer. During the coating process, the light transmittance of the circular transparent glass plate is utilized to allow UV light to pass through the glass plate and irradiate the slurry. After coating, the central motor drives the glass plate and the outer shell to rotate, so that the optical machine is facing the printing area, and the optical machine laser head is activated, emitting ultraviolet light with a wavelength of 365nm. The first layer of slurry is irradiated according to the preset light intensity and illumination time, triggering a light-curing reaction, causing the slurry to quickly solidify and form. The optical machine lifting axis adjusts the irradiation height of the UV light machine according to the printing requirements to ensure that each layer of slurry receives uniform and sufficient illumination. The optical machine telescopic arm can also adjust the position of the optical machine forward and backward when necessary to adapt to the printing requirements of different positions; after completing a layer of printing, the central motor drives the disc to rotate again, so that the scraper system is facing the printing area, and the scraper lifting system drives the scraper to rise to the printing area. Under the control of the motor control system, the scraper system performs a leveling operation on the slurry in the printing area to ensure that the surface of the printed layer is flat and smooth. At the same time, the excess slurry after leveling is returned to the storage barrel through the recovery pipe to achieve slurry recycling; after the scraper completes the leveling and recycling operations, the scraper lifting system lowers the scraper to a certain height and prepares for the next layer of printing; repeat the above steps of coating, rotation, UV light, scraper operation and slurry recovery. The rotation process can realize the alternating use of the two coating heads, stacking printing layer by layer until the entire multi-material 3D printing process is completed.

[0032] The disc's surface is machined to a high-precision flatness to ensure uniform material application. The disc is driven by a motor, enabling precise speed control, with a range of speeds adjustable to suit different printing materials and process requirements.

[0033] The number of coating heads is adjusted based on the number of materials and disc size. Each head is connected to the material supply via a pipe, allowing it to deliver a different printing material. The coating heads utilize a micro-needle structure, enabling precise control of material flow and coating coverage. The disc system allows for alternating printing of different materials.

[0034] The light source is a DLP, LCD, or LED. It uses an ultraviolet (UV) light source as the curing light source, consisting of multiple high-power UV lamps that can provide sufficient intensity. The light source is connected via a universal joint, allowing for free adjustment of the irradiation angle to ensure comprehensive and uniform irradiation of the material coated on the disc. The light source intensity and exposure time can be precisely adjusted through the control system. Appropriate curing parameters can be set based on the material properties and printing requirements of each material, achieving efficient light-curing molding.

[0035] After each layer is printed, the scraper rises to level and recycle the printed area. This removes any residual resin and impurities adhering to the build platform, keeping the print area clean and preventing them from affecting the adhesion and print quality of subsequent layers, ensuring the stability and continuity of the printing process.

[0036] This application is equipped with an advanced microprocessor and software algorithms to control the entire printing process. Users can enter information such as the 3D data of the print model, the type of material, and printing parameters through the user interface. Based on this input, the control system precisely controls the rotation speed of the disc, the material output of the coating head, and the operating status of the curing device, ensuring that all links work together to achieve high-precision printing.

[0037] The core controller is an STM32F407VGT6 (ARM Cortex-M4 core, 168MHz). Its performance parameters include: 512KB of built-in Flash memory, supporting multi-threaded parallel processing; 192KB of built-in SRAM, meeting the data caching requirements of complex algorithms; 12 timer / PWM channels, supporting high-precision motion control; communication interfaces supporting multiple protocols such as SPI, I2C, UART, and CAN, and compatible with sensors and driver modules; and 12-bit ADC sampling accuracy for real-time monitoring of parameters such as slurry level and temperature. The motion control coprocessor is a Trinamic TMC5160 (stepper motor driver chip), supporting six-axis linkage control, including the disk mechanism rotation axis, optical machine lifting axis, and coating head telescopic axis. It offers a resolution of 256 microsteps and a positioning accuracy of ±0.1μm. Integrated current feedback and anti-shake algorithms suppress the effects of mechanical vibration on printing accuracy. The UV light machine control module model is Analog Devices AD9837 (programmable waveform generator), with a frequency resolution of 0.1Hz and supports UV light intensity of 0-100mW / cm 2Stepless adjustment; lighting time control accuracy: ±1μs, adaptable to the curing characteristics of different materials.

[0038] Principle of the multi-material switching adaptive control algorithm: Based on fuzzy PID control, it monitors the coating head pressure, slurry viscosity, and UV curing feedback in real time, and dynamically adjusts the feed speed and scraper height. Advantages: Switching time is shortened to less than 10 seconds (traditional manual switching requires 120 seconds), avoiding material cross-contamination; a viscosity compensation model ensures uniform coating of high-viscosity materials such as ceramics and metals. Principle of the layer error compensation algorithm: Combining computer vision and image morphological operations, it performs contour expansion and corrosion correction on each slice layer to compensate for XY plane errors caused by refraction. Advantages: The staggered layer error is reduced from the traditional ±50μm to ±15μm; it supports macro- and micro-scale cross-forming at a resolution of 43.75μm. Principle of the multi-exposure path planning algorithm: A selective regional expansion strategy is used for multi-material boundary areas to generate overlapping exposure paths to ensure the bonding strength between different material layers. Advantages: The metal-resin and ceramic-resin interface bonding strength is improved by more than 30%; dimensional distortion caused by overexposure is reduced. The G-code dynamic optimization algorithm works by converting slice files into G-code and dynamically adjusting the printing sequence and cooling time based on material properties. For example, a 5-second cooling delay is inserted after the metal slurry layer to prevent thermal deformation, and a spiral fill path is used for the resin layer to improve printing efficiency. Advantages: Printing time for complex models is reduced by 20%-40%.

[0039] Summary of technical advantages:

[0040] 1. High-precision control: The STM32+TMC5160 combination achieves sub-micron motion control. Combined with image compensation algorithms, the dimensional error is reduced by 50% compared to traditional equipment.

[0041] 2. Efficient adaptation of multiple materials: Pneumatic switching + adaptive algorithm shortens material switching time by 90%, supporting seamless printing of more than three materials including photosensitive resin, ceramic, and metal.

[0042] 3. Complex structure capability: Based on G-code optimization and multiple exposure strategies, it can form nested multi-material parts (such as metal inserts + resin matrix), which is suitable for flexible robots, biological scaffolds and other fields.

[0043] Specific embodiment 2: This embodiment differs from specific embodiment 1 in that the disk mechanism 1 includes a circular transparent glass plate 1-1 and a glass plate clamp 1-2; the glass plate clamp 1-2 is symmetrically arranged up and down and fastened to both sides of the circular transparent glass plate 1-1. Other aspects are the same as specific embodiment 1.

[0044] Specific embodiment three: This embodiment differs from specific embodiment one in that the coating system 2 includes a coating head 2-1, a coating lifting shell 2-2, a coating system support body 2-3, and a coating lifting shaft 2-4; the coating lifting shaft 2-4 is arranged on the upper part of the coating system support body 2-3, the coating lifting shell 2-2 is slidably arranged on the outside of the coating lifting shaft 2-4, and the coating head 2-1 is fixed to the upper end of the coating lifting shell 2-2. The coating head 2-1 is connected to the storage barrel 7 through a transmission pipe. Other features are the same as specific embodiment one.

[0045] Specific embodiment 4: This embodiment differs from specific embodiment 3 in that the number of the coating systems 2 is 2 to n, and they are evenly distributed below the circular transparent glass plate 1 - 1 with the central axis of the housing as the center.

[0046] Specific embodiment 5: This embodiment differs from specific embodiment 3 in that the coating head 2-1 adopts a micro-needle structure and the minimum coating diameter is 0.1 mm. Other aspects are the same as specific embodiment 3.

[0047] Specific embodiment six: This embodiment differs from specific embodiment one in that the light curing system 3 includes a UV optical machine laser head 3-1, an optical machine telescopic arm 3-2, an optical machine lifting shaft 3-3, an optical machine support body 3-4, and an optical machine lifting shaft tension adjustment member 3-5; the optical machine lifting shaft 3-3 is slidably arranged on the side of the optical machine support body 3-4, the optical machine telescopic arm 3-2 is fixed to the optical machine lifting shaft 3-3, and the end of the optical machine telescopic arm 3-2 can be horizontally extended relative to the optical machine support body 3-4; the UV optical machine laser head 3-1 is fixed to the end of the optical machine telescopic arm 3-2 via a universal joint; and the optical machine lifting shaft tension adjustment member 3-5 is provided at the upper end of the optical machine support body 3-4. Other aspects are the same as specific embodiment one.

[0048] Specific embodiment 7: This embodiment differs from specific embodiment 6 in that the number of the light curing systems 3 is 1 to n, and the UV light machine laser head 3-1 emits ultraviolet light with a wavelength of 365 nm. Other aspects are the same as specific embodiment 6.

[0049] Specific embodiment eight: This embodiment differs from specific embodiment one in that the scraper gravity recovery system 4 includes a scraper lifting shaft 4-1, a scraper lifting housing 4-2, a scraper system support body 4-3, a slurry recovery trough 4-4, a fixing screw plate 4-5, and a scraper 4-6; the scraper lifting shaft 4-1 is arranged on the upper part of the scraper system support body 4-3, and the scraper lifting housing 4-2 is slidably arranged on the outside of the scraper lifting shaft 4-1; the slurry recovery trough 4-4 is fixed at the upper end of the scraper lifting housing 4-2, and the scraper 4-6 is vertically fixed in the middle position of the slurry recovery trough 4-4 by fixing the screw plate 4-5; the storage barrel 7 is connected to the slurry recovery trough 4-4 via a recovery pipe. Other aspects are the same as specific embodiment one.

[0050] Specific embodiment 9: This embodiment differs from specific embodiment 1 in that a printing platform 8 is further provided in the housing and is made of an aluminum alloy flat plate. Other aspects are the same as specific embodiment 1.

[0051] 10. Specific embodiment 10: This embodiment differs from the specific embodiment 1 in that the specific operation process of the disc coating sinking multi-material 3D printing device is carried out according to the following steps:

[0052] 1. Model preprocessing: The 3D model file to be printed is imported into the control system. The slicing software in the control system slices the model, cutting it vertically into multiple layers of 2D cross-sectional data. Each layer of cross-sectional data is divided into multiple printing areas based on the material requirements and structural characteristics of the model, and the corresponding material and printing parameters are specified for each printing area.

[0053] 2. Coating and curing process: After starting the device, the disc mechanism 1 starts to rotate at a constant speed according to the set initial speed; according to the material information of the first layer of two-dimensional cross-sectional data obtained by slicing, the control system controls the corresponding coating head 2-1 to work, so that the material chamber inside it is connected to the slurry recovery tank 4-4; under the action of pressure, the material is evenly coated on the corresponding position on the surface of the disc mechanism 1 through the micro-needle array discharge port of the coating head 2-1; during the coating process, the control system accurately controls the material outflow and coating time of the coating head 2-1 according to the preset coating thickness and the rotation speed of the disc mechanism to ensure the formation of a uniform material layer; when a layer of material is coated, the disc mechanism 1 continues to rotate, The coated area is brought into the light curing area; the coated material layer is irradiated according to the pre-set irradiation angle and intensity, so that the material is quickly cured and formed. After each layer is cured, the printing platform 8 descends, the disc mechanism 1 rotates to the coating area, and the scraper gravity recovery system 4 rises to recover the uncured material liquid in the printing area; during the curing process, the control system adjusts the irradiation time and intensity of the light machine in real time according to the optical properties of the material and printing requirements to ensure that the material is fully cured; after completing the coating and curing of the first layer, the control system switches the coating head 2-1 according to the material information of the second layer cross-sectional data and repeats the above coating and curing steps, stacking the printed material layer by layer until the entire model is printed;

[0054] 3. Support Structure Processing: During the printing process, the control system automatically generates support structure data for overhanging parts or complex structures in the model based on the model's geometry and stress conditions. The support structure is sliced ​​together with the rest of the model and printed synchronously with other materials during the printing process. Other aspects are the same as in Specific Implementation 1.

[0055] The device of this embodiment utilizes a disc mechanism to rotate, and the material is coated during the rotation process. The disc surface is processed with high precision flatness to ensure that the basic conditions for material coating are good. The control system accurately controls the material outflow from the coating head and the coating time according to the preset coating thickness and the disc rotation speed. For example, in actual operation, when each layer of material is coated, it can be evenly distributed according to the set requirements to avoid local accumulation or thinning, thereby ensuring the uniformity of material distribution from the coating link and reducing printing errors caused by uneven material accumulation. After each layer is cured, the scraper gravity recovery system is started. The scraper is raised to recover the uncured liquid in the printing area, and at the same time, it flattens the surface of the printed layer and returns the excess slurry to the storage barrel for recycling. This process can promptly clean up excess slurry that may cause uneven material accumulation, ensure that the printed surface of each layer is flat and smooth, and further avoid errors in subsequent printing layers due to material residue.

[0056] The following examples are used to verify the beneficial effects of the present invention:

[0057] The present invention takes multi-material (photosensitive resin + ceramic composite layer) printing as an example, and the process is as follows:

[0058] 1. Bottom layer treatment: Start the motor to rotate the glass plate (5 rpm); the coating head extracts the photosensitive resin from the storage barrel and evenly applies it with a layer thickness of 0.1 mm. The UV light machine immediately irradiates (light intensity 50 mW / cm 2 , time 5 seconds) to solidify.

[0059] 2. Multi-layer composite printing: Switch the storage barrel to ceramic slurry, raise the coating head to a layer thickness of 0.15mm, and apply the second layer; lower the UV light machine to 5mm, extend the illumination time to 10 seconds, adapt to the curing characteristics of the ceramic material, and use the scraper system to flatten the bubbles between layers and recycle the excess slurry into the corresponding storage barrel.

[0060] 3. Cycle control: The motor control system repeats the "coating-lighting-scraping" cycle according to the preset program until all layers are printed. After each layer, the glass plate is slightly adjusted in the opposite direction (0.5°) to prevent sticking, and the scraper automatically cleans the edge.

[0061] Printing accuracy comparison (taking printing gears as an example)

[0062]

[0063] Description: Due to the glass plate spin coating + real-time UV curing, the interlayer stress of this device is small, and the error of large-scale models is reduced by 30%-50% compared with traditional equipment.

[0064] Printing efficiency comparison (taking printing gears as an example)

[0065]

[0066] Note: This device reduces the single-layer processing time to 12 seconds per layer (including switching time) by simultaneous coating and light curing, far exceeding traditional equipment.

[0067] Multi-material switching time test

[0068]

Claims

1. A disc coating sinking multi-material 3D printing device, characterized in that The disc coating sinking multi-material 3D printing device comprises a disc mechanism (1), a coating system (2), a light curing system (3), a scraper gravity recovery system (4), a motor (5), a control system, a housing (6) and a storage barrel (7); the motor (5) and the control system are arranged at the center axis position of the housing, the disc mechanism (1) is arranged at the top of the housing (6) and connected to the motor (5) through screws, and the motor (5) provides power output to the disc mechanism (1) through a rotating shaft; the coating system (2), the scraper gravity recovery system (4) and the storage barrel (7) are arranged in the housing (6) around the center axis of the housing (6); the light curing system (3) is arranged at the upper part of the housing (6); and the control system is respectively connected to the coating system (2), the light curing system (3), the scraper gravity recovery system (4) and the motor (5) through electrical signals.

2. A disc coating sinking multi-material 3D printing device according to claim 1, characterized in that The disc mechanism (1) comprises a circular transparent glass plate (1-1) and a glass plate clamp (1-2); the glass plate clamp (1-2) is symmetrically arranged up and down and fastened to both sides of the circular transparent glass plate (1-1).

3. The disc coating sinking multi-material 3D printing device according to claim 1, characterized in that The coating system (2) comprises a coating head (2-1), a coating lifting shell (2-2), a coating system support body (2-3) and a coating lifting shaft (2-4); the coating lifting shaft (2-4) is arranged on the upper part of the coating system support body (2-3), the coating lifting shell (2-2) is slidably arranged on the outside of the coating lifting shaft (2-4), the coating head (2-1) is fixed to the upper end of the coating lifting shell (2-2), and the coating head (2-1) is connected to the storage barrel (7) through a transmission pipe.

4. The disc coating sinking multi-material 3D printing device according to claim 3, characterized in that The number of the coating systems (2) is 2 to n, and they are evenly distributed below the circular transparent glass plate (1-1) with the central axis of the shell as the center.

5. The disc coating sinking multi-material 3D printing device according to claim 3, characterized in that The coating head (2-1) adopts a micro-needle structure, and the minimum coating diameter is 0.1 mm.

6. The disc coating sinking multi-material 3D printing device according to claim 1, characterized in that The light curing system (3) comprises a UV optical machine laser head (3-1), an optical machine telescopic arm (3-2), an optical machine lifting shaft (3-3), an optical machine support body (3-4), and an optical machine lifting shaft tension adjustment member (3-5); the optical machine lifting shaft (3-3) is slidably arranged on the side of the optical machine support body (3-4), the optical machine telescopic arm (3-2) is fixed on the optical machine lifting shaft (3-3), and the end of the optical machine telescopic arm (3-2) is horizontally telescopic relative to the optical machine support body (3-4); the UV optical machine laser head (3-1) is fixed to the end of the optical machine telescopic arm (3-2) through a universal joint; and the optical machine lifting shaft tension adjustment member (3-5) is arranged at the upper end of the optical machine support body (3-4).

7. The disc coating sinking multi-material 3D printing device according to claim 6, characterized in that The number of the light curing systems (3) is 1 to n, and the UV light machine laser head (3-1) emits ultraviolet light with a wavelength of 365 nm.

8. The disc coating sinking multi-material 3D printing device according to claim 1, characterized in that The scraper gravity recovery system (4) comprises a scraper lifting shaft (4-1), a scraper lifting shell (4-2), a scraper system support body (4-3), a slurry recovery trough (4-4), a fixing screw plate (4-5) and a scraper (4-6); the scraper lifting shaft (4-1) is arranged on the upper part of the scraper system support body (4-3), and the scraper lifting shell (4-2) is slidably arranged on the outside of the scraper lifting shaft (4-1); the slurry recovery trough (4-4) is fixed at the upper end of the scraper lifting shell (4-2), and the scraper (4-6) is vertically fixed to the middle position of the slurry recovery trough (4-4) by the fixing screw plate (4-5); the storage barrel (7) is connected to the slurry recovery trough (4-4) through a recovery pipe.

9. The disc coating sinking multi-material 3D printing device according to claim 1, characterized in that A printing platform (8) is also provided in the shell and is made of an aluminum alloy flat plate.

10. The disc coating sinking multi-material 3D printing device according to claim 1, characterized in that The specific operation process of the disc coating sinking multi-material 3D printing device is as follows:

1. Model preprocessing: The 3D model file to be printed is imported into the control system. The slicing software in the control system slices the model, cutting it vertically into multiple layers of 2D cross-sectional data. Each layer of cross-sectional data is divided into multiple printing areas based on the material requirements and structural characteristics of the model, and the corresponding material and printing parameters are specified for each printing area.

2. Coating and curing process: After starting the device, the disc mechanism (1) starts to rotate at a constant speed according to the set initial speed; based on the material information of the first layer of two-dimensional cross-sectional data obtained by slicing, the control system controls the corresponding coating head (2-1) to work, so that the material chamber inside it is connected to the slurry recovery tank (4-4); under the action of pressure, the material is evenly coated on the corresponding position of the surface of the disc mechanism (1) through the micro-needle array discharge port of the coating head (2-1); during the coating process, the control system accurately controls the material outflow and coating time of the coating head (2-1) according to the preset coating thickness and the rotation speed of the disc mechanism to ensure the formation of a uniform material layer; when a layer of material is coated, the disc mechanism (1) continues to rotate The coated area is brought into the light curing area; the coated material layer is irradiated according to the pre-set irradiation angle and intensity, so that the material is quickly cured and formed. After each layer is cured, the printing platform (8) descends, the disc mechanism (1) rotates to the coating area, and the scraper gravity recovery system (4) rises to recover the uncured material liquid in the printing area; during the curing process, the control system adjusts the irradiation time and intensity of the light machine in real time according to the optical properties of the material and the printing requirements to ensure that the material is fully cured; after completing the coating and curing of the first layer, the control system switches the coating head (2-1) according to the material information of the second layer cross-sectional data and repeats the above coating and curing steps, stacking the printed material layer by layer until the entire model is printed; 3. Support structure processing: During the printing process, for overhanging parts or complex structures in the model, the control system will automatically generate support structure data based on the model's geometry and stress conditions; the support structure will be sliced ​​together with the rest of the model and printed synchronously with other materials during the printing process.

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