A multi-material multi-axis gray scale control realizes local structure strengthening of a photo-cured micro-nano 3D printing device and method

Abstract

The application discloses a kind of multi-material multi-axis gray scale control implementation local structure reinforcement light-cured micro-nano 3D printing equipment, base is provided with x-axis screw slide table, y-axis screw slide table and z-axis screw slide table, z-axis screw slide table is provided with the rotating platform of installing multiple grooves, to realize the switching of different material liquid resin material by rotating platform, z-axis screw slide table is connected with printing platform, and printing platform can be lifted and inclined adjustment relative to groove;Multi-light source module is arranged on the L column of base and includes different range sections of light machine I, light machine II, light machine III and light machine IV with gray scale value covering 0 to 255, rotating mechanism drives multi-light source module to rotate around z central axis, by switching different grooves, to switch different gray scale value light, different material liquid resin material carries out gray scale printing, realizes multi-material printing to enhance the mechanical properties of printing product, and obtains different gradient mechanical properties structure or relatively easy to remove support structure.

Description

Technical Field

[0001] This invention belongs to the field of 3D printing processing technology, and in particular provides a photopolymerization micro-nano 3D printing equipment and method for achieving local structural reinforcement through multi-material and multi-axis grayscale control. Background Technology

[0002] Additive manufacturing ("3D printing") technology has become a popular new manufacturing technology in recent years, and its development has risen to the level of national strategic development. Among them, photopolymerization rapid prototyping technology uses photosensitive resin liquid as raw material. The photosensitive properties of the resin cause the material to undergo a polymerization reaction and solidify after being irradiated by light of a specific wavelength (mostly ultraviolet). In areas not exposed to light, the resin retains its original liquid properties, making it one of the most promising directions in additive manufacturing ("3D printing") technology.

[0003] Currently, most photopolymer 3D micro-nano printing equipment, both domestically and internationally, employs a single-axis movement and layer-by-layer exposure printing. Most current photopolymer 3D printing equipment is only used for molding single liquid photosensitive resins. While some equipment achieves composite molding of two liquid photosensitive resins, it uses a single light source for exposure, which prevents the application of different initiation factors (light in specific wavelengths) to different liquid photosensitive resin materials. This makes it impossible to achieve optimal exposure for various liquid photosensitive resin materials, thus hindering the production of easily removable support components after printing with liquid photosensitive resin.

[0004] In addition, most photopolymer 3D printing equipment uses photopolymer digital micro-mirror device (DMD) chips, which can change the printed pattern by modifying parameters. However, the cost is high and the resolution is low. The current technology can only reach the micrometer level (around 5.4 μm), which results in low printing accuracy. Although scaling the lens can further improve the resolution, it reduces the printing area and reduces printing efficiency. Summary of the Invention

[0005] To address the aforementioned technical problems of existing photopolymer 3D micro / nano printing equipment, this invention provides a photopolymer 3D micro / nano printing device and method for achieving local structural reinforcement through multi-material, multi-axis grayscale control. This method enables the switching of various liquid photosensitive resins of different materials during the printing process and provides light of a specific wavelength for each liquid photosensitive resin as an initiating factor, thereby obtaining the best exposure effect, improving printing speed and quality, and enhancing printing accuracy and efficiency.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a photopolymerization micro / nano 3D printing device for achieving localized structural reinforcement through multi-material, multi-axis grayscale control, comprising a base, material tanks, a printing platform, and a multi-light source module. The base is equipped with an X-axis lead screw slide adjustable along the X-axis, a Y-axis lead screw slide adjustable along the Y-axis, and a Z-axis lead screw slide adjustable along the Z-axis. The Z-axis lead screw slide is connected to the base via the X-axis and Y-axis lead screw slides arranged in series. Near the lower end of the Z-axis lead screw slide is a guide plate that can be independently raised and lowered. A rotating platform is mounted on the guide plate, capable of rotating around a first Z-axis central axis. Multiple material tanks are mounted on the rotating platform and arranged around the first Z-axis central axis. Each material tank contains a liquid resin material of a different material, allowing for switching between different liquid resin materials by driving the rotating platform to rotate the different material tanks around the first Z-axis central axis to a position below the printing platform. A first support capable of independent lifting and adjustment is located near the upper end of the Z-axis lead screw slide. The first support is connected to a second support, and the printing platform is mounted on the second support. The second Z-axis central axis of the printing platform is driven and connected to a rotating mechanism. An inverted L-shaped column is located on the outer side of the base, with its horizontal section extending above the printing platform. The multi-light source module is mounted on the horizontal section of the L-shaped column, and its third Z-axis central axis is driven and connected to the rotating mechanism. The multi-light source module has a ring array of optical engines outside the third Z-axis, with the number of optical engines equal to the number of material slots. Each optical engine uses a mask for imaging, and the grayscale value of each optical engine covers a different range from 0 to 255. The rotating mechanism drives the multi-light source module to rotate around the third Z-axis central axis, thereby switching the different optical engines of the multi-light source module to be directly above the printing platform. This allows for the switching of light to different grayscale values ​​corresponding to different liquid resin materials, completing grayscale printing, obtaining a structure with enhanced mechanical properties, and obtaining structures with different gradient mechanical properties or easily removable support structures.

[0007] Optionally, the multi-light source module includes optical engine I, optical engine II, optical engine III, and optical engine IV, with grayscale values ​​ranging from 0 to 255. The rotating mechanism is used to drive the multi-light source module to rotate around the third Z-axis central axis, so as to switch the optical engine I, optical engine II, optical engine III, and optical engine IV of the multi-light source module to be directly above the printing platform, thereby achieving light switching of different grayscale values.

[0008] Optionally, the plurality of material tanks include material tank I, material tank II, material tank III and material tank IV, so as to achieve the switching of liquid resin materials of different materials by driving material tank I, material tank II, material tank III and material tank IV to rotate around the first Z-axis central axis through the rotating platform.

[0009] Optionally, the rotating platform includes a rotating disk, which has an annular structure centered on a first Z-axis. Multiple material trough racks are arranged around the outer side of the annular structure, and the material troughs are detachably placed on the material trough racks.

[0010] Optionally, the rotating platform further includes an outer cylindrical gear, a first stepper motor, an inner cylindrical gear, and rolling bearings. The rotating disk is connected to the guide plate via the rolling bearings. The inner cylindrical gear is fixedly connected to the rotating disk. The outer cylindrical gear meshes with the inner cylindrical gear. The first stepper motor is mounted on the guide plate and driven by the outer cylindrical gear. The first stepper motor drives the outer cylindrical gear and the inner cylindrical gear to cooperate, thereby rotating the rotating disk and switching between different material troughs.

[0011] Optionally, the guide plate moves the material tank up and down under the drive of the second stepper motor, thereby adjusting the distance between the liquid surface of the material tank and the optical engine, achieving high-precision optical engine focusing adjustment, and obtaining printed parts with higher precision dimensions. The Z-axis lead screw slide drives the first bracket to move up and down, thereby realizing the top-down movement of the printing platform to achieve the layer-by-layer printing process. Surface or point printing is achieved based on the surface mask projection or point mask projection of optical engines I, II, III, and IV.

[0012] Optionally, the second bracket is set at the outer end of the first bracket and can be adjusted around the X-axis angle. The second bracket is provided with a gear that meshes with the drive gear to control the third stepper motor to drive the gear, so that the second bracket swings in an arc, thereby realizing the tilting movement of the printing platform relative to the material tray. With the cooperation of multi-axis linkage, curved surface printing can be completed well.

[0013] Optionally, the X-axis lead screw slide, Y-axis lead screw slide, and Z-axis lead screw slide are integrated with the rotary platform and printing platform. The movement of the printing platform on the X, Y, and Z axes and the angular rotation around the X-axis are realized by controlling the working state of the stepper motors in each part.

[0014] To achieve the above objectives, in a second aspect, the present invention provides a photopolymerization micro / nano 3D printing method for achieving local structural reinforcement through multi-material, multi-axis grayscale control:

[0015] Select a suitable liquid resin material based on the performance of the designed printed product, and pour the selected liquid resin material into the material tank;

[0016] First layer printing: Import the designed and sliced ​​3D model into the machine, select the model you need, press start, the machine's X, Y and Z axes return to the reference coordinate origin, the processor in the machine processes according to the set model, the light source emits light, the liquid resin material illuminated by the light quickly solidifies, and the material in the dark remains in its original liquid state.

[0017] When one layer is processed, the printing platform descends to the next layer according to the parameters to print the second layer. This cycle continues until the last layer is processed and the machine stops working.

[0018] During the printing process of each layer, different material tanks are switched to achieve printing of multi-liquid resin materials, thereby enhancing the mechanical properties of the printed products;

[0019] After switching between different material tanks, the optomechanical system of the multi-light source module is switched accordingly to match different liquid resin materials with corresponding grayscale values ​​of light, so as to improve the exposure effect and obtain better structural enhancement.

[0020] During the printing process of each layer, the printed product can move along the X, Y, and Z axes and rotate around the X axis to achieve curved surface printing through multi-axis linkage.

[0021] In some preferred technical solutions, during the printing of each layer, while keeping the material tank unchanged, different optical engines of the multi-light source module are switched to achieve grayscale printing of tubes with multiple grayscale values ​​of a single material liquid resin, so as to obtain a better support part that increases the structure and is easy to remove after printing.

[0022] Compared with existing photopolymer 3D printing devices, the main technical advantages of the photopolymer micro / nano 3D printing equipment provided by this invention, which achieves local structural reinforcement through multi-material, multi-axis grayscale control, include:

[0023] Firstly, multiple material tanks containing liquid resin materials of different materials are set on the rotating platform, and multiple optical engines are set in the multi-light source module. The grayscale value of each optical engine covers a different range from 0 to 255. By switching between optical engines and material tanks, different grayscale values ​​of light and corresponding liquid resin materials of different materials can be switched to achieve the best exposure effect, improve printing speed and quality, meet the mechanical properties of printed products, and obtain structures with different gradient mechanical properties or easily removable support structures.

[0024] Secondly, the multi-light source module can complete multiple degrees of freedom adjustment. Combined with the platform's multi-degree-of-freedom adjustment, it can flexibly and with high precision realize the printing of tilted bodies and various curved surface shapes, resulting in printed products that meet the mechanical performance requirements.

[0025] Thirdly, the optical engine uses a mask for imaging. By driving the rotation of the optical engine, not only is the printing accuracy improved, but large-area scanning is also possible, which reduces costs and increases the printing speed. Attached Figure Description

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The accompanying drawings, which are included to provide a further understanding of the invention and constitute a part of this application, illustrate exemplary embodiments of the invention and, together with their descriptions, serve to explain the invention and do not constitute an undue limitation thereof.

[0027] Figure 1 This is a three-dimensional structural schematic diagram of a preferred embodiment of the photopolymerization micro / nano 3D printing equipment for achieving local structural reinforcement through multi-material, multi-axis grayscale control provided by the present invention.

[0028] Figure 2 This is a front view of the structure of the photopolymer micro / nano 3D printing equipment provided by the present invention after the material tank has been removed.

[0029] Figure 3 This is a schematic diagram of the three-dimensional structure of the photopolymer micro / nano 3D printing equipment provided by the present invention after the material tank is removed.

[0030] Figure 4 This is a three-dimensional structural diagram of the rotating platform of the photopolymerization micro / nano 3D printing equipment provided by the present invention.

[0031] Figure 5 This is a schematic diagram of the optomechanical system of the multi-source module of the photopolymer micro-nano 3D printing equipment provided by the present invention. Detailed Implementation

[0032] Existing photopolymerization 3D micro / nano printing equipment is mostly used for molding single liquid photosensitive resins. Although some equipment can achieve composite molding of two liquid photosensitive resins, it uses a single light source for exposure. This means it cannot configure different initiation factors (light of specific wavelengths) for different liquid photosensitive resin materials, and it cannot achieve the best exposure effect for various liquid photosensitive resin materials. As a result, it is impossible to obtain a support part that can be easily removed after printing with liquid photosensitive resin. Furthermore, the use of photopolymerization digital micromirror devices (DMD chips) allows for changes in the printed pattern by modifying parameters, resulting in low printing accuracy. Although scaling the lens can further improve the resolution, it reduces the printing area and lowers the printing efficiency.

[0033] To address the aforementioned problems in the prior art, this invention provides a photopolymerization micro / nano 3D printing device and method for achieving local structural reinforcement through multi-material, multi-axis grayscale control. The following is a detailed description in conjunction with the accompanying drawings. It should be noted that the specific implementations are only some preferred examples, not all examples.

[0034] like Figures 1 to 4As shown, in some preferred embodiments, the present invention provides a photopolymerization micro / nano 3D printing device for achieving local structural reinforcement through multi-material multi-axis grayscale control, including a base 1, a material tank 2, a rotating platform 3, a guide plate 4, a Z-axis lead screw slide 5, a first support 6, a gear 7, a rolling bearing 8, a second support 9, a printing platform 10, an L-column 11, a multi-light source block 12, a Y-axis lead screw slide 13, an X-axis lead screw slide 14, a Z-axis guide rail 15, an X-axis guide rail 16, a stepper motor 17, a lead screw 18, and a Y-axis guide rail 19.

[0035] like Figure 1 , Figure 2 As shown, in some preferred embodiments, the L-pillar 11 is fixedly connected to the base 1 by welding, the multi-light source block 12 is fixedly connected to the shaft of the fourth stepper motor, the fourth stepper motor is fastened to the L-pillar 11 by screws, and the optomechanical block 12 includes optomechanical I, optomechanical II, optomechanical III, and optomechanical IV with grayscale values ​​from 0 to 255. The operation state of the fourth stepper motor is controlled to realize the rotation of the optomechanical block 12, so that the optomechanical block switches the four optomechanicals to realize the switching of light with different grayscale values, complete grayscale printing, and obtain a mechanism with different gradient mechanical properties or a support structure that is easier to remove.

[0036] like Figure 1 As shown, in some preferred embodiments, the material trough 2 is fixed on the rotating platform 3. The material trough 2 includes material trough I2-1, material trough II2-2, material trough III2-3, and material trough IV2-4. The rotating platform 3 is fixed on the guide plate 4, and the guide plate 4 is threadedly engaged with the Z-axis lead screw slide 5. The printing platform 10 is connected and fixed to the shaft of the fifth stepper motor. The fifth stepper motor is fastened to the second bracket 9 by screws. The second bracket 9 forms a rotating pair with the first bracket 6 through the rolling bearing 8. The upper end of the second bracket 9 has an internal thread that engages with the gear 7. The gear 7 is interference-fitted with the shaft of the fifth stepper motor. The fifth stepper motor is fastened to the first bracket 6 by screws. The first bracket 6 is threadedly engaged with the Z-axis lead screw slide 5. The rotating platform 3 is driven by the fifth stepper motor to achieve the switching of material trough I2-1, material trough II2-2, material trough III2-3, and material trough IV2-4.

[0037] like Figure 1 As shown, in some preferred embodiments, the Z-axis lead screw slide 5 drives the first support 6 to move up and down, thereby realizing the layer-by-layer printing process by moving the printing platform 10 from top to bottom. Surface or point printing is achieved based on the surface mask projection or point mask projection of optical engine I, optical engine II, optical engine III, and optical engine IV. The third stepper motor drives the gear 7 to make the second support 9 swing in an arc, thereby realizing the tilting movement of the printing platform 10 relative to the material tank 2. With multi-axis linkage, curved surface printing can be completed well.

[0038] like Figure 1As shown, in some preferred embodiments, the Z-axis lead screw slide 5 is threadedly engaged with the lead screw 18 in the Y-axis lead screw slide 13, and the Y-axis lead screw slide 13 is threadedly engaged with the lead screw in the X-axis lead screw slide 14. The X-axis lead screw slide 14 is fixed on the base 1. The X-axis lead screw slide 14 consists of an X-axis guide rail 16, a stepper motor 17, and the lead screw 18. The X-axis guide rail 16 is fixed on the base 1, and a coupling connects the shafts of the lead screw 18 and the stepper motor 17. The stepper motor 17 is fixed to the outside of the X-axis guide rail 16 by screws. The Y-axis lead screw slide 13 consists of a stepper motor 17, the lead screw 18, and a Y-axis guide rail 19. The Y-axis guide rail 19 is threadedly engaged with the lead screw in the X-axis lead screw slide 14, and a coupling connects the shafts of the lead screw 18 and the stepper motor 17. The stepper motor 17 is fastened to the Y-axis guide rail 19 by screws. The Z-axis lead screw slide 5 consists of a Z-axis guide rail 15, a stepper motor 17, and a lead screw 18. The Z-axis guide rail 15 is threadedly engaged with the lead screw in the Y-axis lead screw slide 13. A coupling connects the shaft of the lead screw 18 and the shaft of the stepper motor 17. The stepper motor 17 is fastened to the Z-axis guide rail 15 with screws. The X-axis lead screw slide 14, Y-axis lead screw slide 13, and Z-axis lead screw slide 5 are integrated with the rotary platform 3 and the printing platform 10. By controlling the working state of the stepper motors in each part, the printing platform 10 can move along the X, Y, and Z axes, rotate at the X-axis angle, and switch between different light sources and liquid resin materials.

[0039] like Figure 2 , Figure 3 and Figure 4 As shown, in some preferred embodiments, the rotating platform 3 consists of a rotating disk 3-1, an outer cylindrical gear 3-2, a first stepper motor 3-3, an inner cylindrical gear 3-4, and a rolling bearing 3-5. A material trough can be placed on the rotating disk 3-1. The rotating disk 3-1 is connected and fixed to the rolling bearing 3-5, which is fixedly connected to the guide plate 4. The inner cylindrical gear 3-4 is fixed to the inner ring of the rolling bearing 3-5. The outer cylindrical gear 3-2 and the inner cylindrical gear 3-4 form a gear engagement. The outer cylindrical gear 3-2 and the shaft of the first stepper motor 3-3 form an interference fit. The first stepper motor 3-3 is fastened to the guide plate 4 with screws. The first stepper motor 3-3 drives the outer cylindrical gear 3-2 and the inner cylindrical gear 3-4 to rotate the rotating disk 3-1, thereby switching between different material troughs to switch between different liquid resin materials. Driven by the Z-axis stepper motor (second stepper motor), the guide plate 4 moves up and down in the material tank, thereby adjusting the distance between the liquid surface of the liquid resin material in the material tank 2 and the photomechanical system, achieving high-precision photomechanical focusing adjustment, and obtaining printed parts with higher precision dimensions.

[0040] Optical mechanics I, II, III, and IV belong to the same category of optical mechanics components and flowcharts, as shown below. Figure 5 As shown, the main functions of each part are as follows:

[0041]

[0042] It should be noted that the dimmable light-adjust ...

[0043] This invention provides a photopolymerization micro / nano 3D printing method for achieving localized structural reinforcement through multi-material, multi-axis grayscale control. In some preferred embodiments, the method includes the following steps:

[0044] Select a variety of liquid resin materials according to the performance of the designed printed product, and pour the selected liquid resin materials into material tank 2;

[0045] First layer printing: Import the designed and sliced ​​3D model into the machine, select the model you need, press start, the machine's X, Y and Z axes return to the reference coordinate origin, the processor in the machine processes according to the set model, the light source emits light, the liquid resin material that is illuminated by the light quickly solidifies, and the liquid resin material in the area without light remains in its original liquid state.

[0046] When one layer is processed, the printing platform 10 descends one layer according to the parameters to print the second layer, and so on. The machine stops working when the last layer is processed.

[0047] During the printing of each layer, different material tanks 2 are switched to achieve printing of various liquid resin materials, thereby enhancing the mechanical properties of the printed products;

[0048] After switching to different material tanks 2, the optomechanical system of the multi-light source module 12 is switched accordingly to match different liquid resin materials with corresponding grayscale light, so as to improve the exposure effect and obtain a structure with better mechanical properties.

[0049] During the printing process of each layer, the printed product can move along the X, Y, and Z axes and rotate around the X axis to achieve curved surface printing through multi-axis linkage.

[0050] In some preferred embodiments, a photopolymerization micro / nano 3D printing method for achieving local structural reinforcement through multi-material, multi-axis grayscale control is provided, comprising the following steps:

[0051] During the printing process of each layer, while keeping each liquid resin material constant, different optical engines of the multi-light source module 12 are switched to achieve grayscale printing of tubes with multiple grayscale values ​​of a single liquid resin material, so as to obtain a structure with better mechanical properties and a support part that is easy to remove after printing.

[0052] The specific operating steps are as follows: First, select various suitable liquid resin materials according to the performance of the designed part, and pour the selected liquid resin materials into the solution tank; import the designed and sliced ​​3D model into the machine, select the required model, press start, and the machine's X, Y, and Z axes return to the reference coordinate origin. The processor in the machine processes according to the set model. The light source emits light, and the liquid resin material illuminated by the light quickly solidifies. In areas without light, the liquid resin material remains in its original state. When printing the supporting part, switch the light source as needed for grayscale printing. Switching between multiple light sources can better increase the structural rationality and feasibility, reduce the hardness and other properties of the supporting part, and facilitate the removal of the support after the overall printing is completed. When printing the same part, different liquid resin materials and light sources can be switched to achieve grayscale printing with multiple liquid resin materials and multiple light sources, which can better meet the performance requirements of the structure. The machine can realize the movement of the part along the Y, X, and Z axes and the rotation angle along the X axis according to the processing needs of the product's 3D model, thereby achieving multi-axis linkage. After processing one layer, the worktable automatically descends according to the parameters to process the second layer. When the last layer is completed, the machine stops working. At this point, the part is finished and rests on the liquid resin material. The worker can then remove the part. To print the next part, the worker simply presses the start button. It should be noted that the machine's reference coordinate origin is the X, Y, and Z axes working together, ensuring that the lens is directly below the center of the solution tank and that the worktable coincides with the bottom of the solution tank.

[0053] The main technical advantages of the photopolymerization micro / nano 3D printing equipment with multi-material, multi-axis grayscale control for localized structural reinforcement provided by this invention are as follows: Multiple material tanks containing different liquid resin materials are set up on the rotating platform, and multiple optical engines are set up in the multi-light source module. The grayscale value of each optical engine covers a different range from 0 to 255. By switching between optical engines and material tanks, different grayscale values ​​of light and corresponding liquid resin materials can be switched to achieve optimal exposure, improve printing speed and quality, meet the mechanical properties of the printed product, and obtain structures with different gradient mechanical properties or easily removable support structures. Furthermore, the multi-light source module can perform multiple degrees of freedom adjustment, which, combined with the multi-degree-of-freedom adjustment of the platform, allows for flexible and high-precision printing of tilted bodies and various curved surface shapes, resulting in printed products with satisfactory mechanical properties. Simultaneously, the optical engine uses mask imaging. By driving the rotation of the optical engine, not only is printing accuracy improved, but large-area scanning is also possible, reducing costs while increasing printing speed.

[0054] The above are merely preferred embodiments of the present invention and are not limited to the examples given. Improvements and modifications made by those skilled in the art within the scope of the present invention are also within the protection scope of the present invention.

Claims

1. A photopolymerization micro / nano 3D printing device for achieving localized structural reinforcement through multi-material, multi-axis grayscale control, characterized in that: It includes a base (1), a material trough (2), a printing platform (10), and a multi-light source module (12); The base (1) is provided with an X-axis lead screw slide (14) that can be moved and adjusted along the X-axis, a Y-axis lead screw slide (13) that can be moved and adjusted along the Y-axis, and a Z-axis lead screw slide (5) that can be moved and adjusted along the Z-axis. The Z-axis lead screw slide is connected to the base through the X-axis lead screw slide (14) and the Y-axis lead screw slide (13) arranged in series. Near the lower end of the Z-axis lead screw slide (5), there is a guide plate (4) that can be independently raised and lowered. A rotating platform (3) that can rotate around the first Z-axis central axis is provided on the guide plate (4). Multiple material tanks (2) are arranged on the rotating platform (3) and around the first Z-axis central axis. Each material tank (2) contains liquid resin material of different materials. The rotating platform drives the different material tanks (2) to rotate around the first Z-axis central axis to the bottom of the printing platform (10) to achieve the switching of liquid resin material of different materials. The Z-axis lead screw slide (5) is provided with a first bracket (6) that can be independently raised and lowered near the upper end. The first bracket (6) is connected to a second bracket (9). The printing platform (10) is set on the second bracket (9). The second Z-axis central rotating shaft of the printing platform (10) is driven and connected to the first rotating mechanism. An inverted L-shaped column (11) is provided on the outside of the base (1). The horizontal section of the L-shaped column (11) extends above the printing platform (10). The multi-light source module (12) is located on the horizontal section of the L-shaped column. The third Z-axis of the multi-light source module (12) is connected to the second rotating mechanism. The multi-light source module (12) has an array of optical engines in a ring outside the third Z-axis, with the number of optical engines equal to the number of material tanks. Each optical engine is imaged using a mask, and the grayscale value of each optical engine covers a different range from 0 to 255. The second rotating mechanism is used to drive the multi-light source module (12) to rotate around the third Z-axis so as to switch the different optical engines of the multi-light source module (12) to the top of the printing platform. In conjunction with the switching of different liquid resin materials, the light switching of different grayscale values ​​is realized, and grayscale printing is completed to obtain structures with different gradient mechanical properties or support structures that are easier to remove.

2. The photopolymerization micro / nano 3D printing equipment for achieving local structural reinforcement through multi-material, multi-axis grayscale control according to claim 1, characterized in that: The multi-light source module (12) includes optical engine I, optical engine II, optical engine III and optical engine IV with gray values ​​ranging from 0 to 255. The second rotating mechanism is used to drive the multi-light source module (12) to rotate around the third Z-axis central axis so that the optical engine I, optical engine II, optical engine III and optical engine IV of the multi-light source module (12) can be switched to the top of the printing platform to achieve light switching of different gray values.

3. The photopolymerization micro / nano 3D printing equipment for achieving local structural reinforcement through multi-material, multi-axis grayscale control according to claim 1 or 2, characterized in that: The plurality of material tanks (2) include material tank I (2-1), material tank II (2-2), material tank III (2-3) and material tank IV (2-4), so as to achieve the switching of liquid resin materials of different materials by driving material tank I (2-1), material tank II (2-2), material tank III (2-3) and material tank IV (2-4) to rotate around the first Z-axis central axis through the rotating platform.

4. The photopolymerization micro / nano 3D printing equipment for achieving local structural reinforcement through multi-material, multi-axis grayscale control according to claim 1, characterized in that: The rotating platform (3) includes a rotating disk (3-1), which has an annular structure centered on the first Z-axis. Multiple material trough racks are arranged around the outer side of the annular structure, and the material troughs (2) are detachably placed on the material trough racks.

5. The photopolymerization micro / nano 3D printing equipment for achieving local structural reinforcement through multi-material, multi-axis grayscale control according to claim 4, characterized in that: The rotating platform also includes an outer cylindrical gear (3-2), a first stepper motor (3-3), an inner cylindrical gear (3-4), and a rolling bearing (3-5). The rotating disk (3-1) is connected to the guide plate (4) through the rolling bearing (3-5). The inner cylindrical gear (3-4) is fixedly connected to the rotating disk (3-1). The outer cylindrical gear (3-2) meshes with the inner cylindrical gear (3-4). The first stepper motor (3-3) is mounted on the guide plate (4) and driven by the outer cylindrical gear (3-2). The first stepper motor (3-3) drives the outer cylindrical gear (3-2) to cooperate with the inner cylindrical gear (3-4) to realize the rotation of the rotating disk (3-1), thereby switching between different material troughs.

6. The photopolymerization micro / nano 3D printing equipment for achieving local structural reinforcement through multi-material, multi-axis grayscale control according to claim 1, characterized in that: The guide plate (4) moves up and down under the drive of the second stepper motor, thereby adjusting the distance between the liquid surface of the liquid resin material in the material tank (2) and the optical engine, realizing high-precision optical engine focusing adjustment, and obtaining printed parts with higher precision dimensions. The Z-axis lead screw slide (5) drives the first bracket (6) to move up and down, thereby realizing the layer-by-layer printing process of the printing platform (10) moving from top to bottom. The surface or point printing is realized according to the surface mask projection or point mask projection of optical engine I, optical engine II, optical engine III, and optical engine IV.

7. The photopolymerization micro / nano 3D printing equipment for achieving local structural reinforcement through multi-material, multi-axis grayscale control according to claim 1, 2, 4, or 5, characterized in that: The second bracket (9) is set at the outer end of the first bracket (6) and can be adjusted around the X-axis angle. The second bracket is provided with a toothed part that meshes with the drive gear (7). The third stepper motor drives the gear (7) to make the second bracket (9) swing in an arc, thereby realizing the tilting movement of the printing platform (10) relative to the material tank (2). With the multi-axis linkage, it can complete the curved surface printing well.

8. The photopolymerization micro / nano 3D printing equipment for achieving local structural reinforcement through multi-material, multi-axis grayscale control according to claim 1, characterized in that: The X-axis lead screw slide (14), Y-axis lead screw slide (13), and Z-axis lead screw slide (5) are integrated with the rotary platform (3) and the printing platform (10). The printing platform (10) can move on the X, Y, and Z axes and rotate around the X-axis by controlling the working state of the stepper motors of each part.

9. A photopolymerization micro / nano 3D printing method for achieving localized structural reinforcement through multi-material, multi-axis grayscale control, using the photopolymerization micro / nano 3D printing equipment for achieving localized structural reinforcement through multi-material, multi-axis grayscale control as described in any one of claims 1-8, comprising: Select a variety of liquid resin materials according to the performance of the designed printed product, and pour the selected liquid resin materials into the material tank (2); First layer printing: Import the designed and sliced ​​3D model into the photopolymer micro-nano 3D printing equipment, select the required model, press start, the X, Y and Z axes of the photopolymer micro-nano 3D printing equipment return to the reference coordinate origin, the processor in the photopolymer micro-nano 3D printing equipment processes according to the set model, the light source emits light, the liquid resin material illuminated by the light quickly solidifies, and the liquid resin material in the areas without light remains in the original liquid state; When one layer is processed, the printing platform (10) descends one layer according to the parameters to print the second layer. This cycle continues until the last layer is processed. The photopolymer micro-nano 3D printing equipment stops working. During the printing of each layer, different material tanks (2) are switched to achieve printing of various liquid resin materials to enhance the mechanical properties of the printed products; After switching different material tanks (2), the optical engine of the multi-light source module (12) is switched accordingly to achieve the matching of different liquid resin materials with corresponding gray value light, so as to improve the exposure effect and obtain a structure with better mechanical properties; during the printing of each layer, the printed product is moved on the X-axis, Y-axis, and Z-axis and rotated around the X-axis to perform curved surface printing through multi-axis linkage.

10. The photopolymerization micro / nano 3D printing method for achieving local structural reinforcement through multi-material, multi-axis grayscale control according to claim 9, characterized in that: During the printing of each layer, while keeping each liquid resin material constant, different optical engines of the multi-light source module (12) are switched to achieve grayscale printing of multiple grayscale values ​​of a single liquid resin material, so as to obtain a structure with better mechanical properties and a support part that is easy to remove after printing.

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