A composite 3D printer and a printing method thereof

Abstract

The application discloses a kind of composite 3D printer and its printing method, 3D printer includes light-cured printing module and fusion printing module, light-cured printing module includes first printing platform, first printing platform top is equipped with blade coating component, fusion printing module includes second printing platform, and second printing platform is equipped with nozzle assembly, nozzle assembly includes Y-axis drive unit, and the output end of Y-axis drive unit is equipped with nozzle unit;Through the mode that blade coating component and nozzle assembly are alternately printed in first printing platform and second printing platform, so that 3D printer can print multiple different material articles and print composite material articles simultaneously;Solve the problem that most of the existing 3D printers are limited to single-material printing, resulting in low printing efficiency and low practicality.

Description

Technical Field

[0001] This invention belongs to the field of 3D printing, specifically relating to a composite 3D printer and its printing method. Background Technology

[0002] 3D printing is an additive manufacturing technology based on the principle of layer-by-layer material stacking, commonly used in the product development stage to create prototypes. However, existing 3D printers are typically equipped with only a single printing stage and are limited to single-material operations. This not only prevents them from printing multiple items made of different materials simultaneously, but also makes them unable to print composite materials. For example, in the field of metal / ceramic composite printing, products such as electronic ceramic devices, ceramic packages, and multilayer ceramic substrates require printing with two different materials, and single-material 3D printers cannot meet the printing needs of such products.

[0003] In existing technologies, such as patent document CN105818390B, a 3D printer with rapid printing capability is disclosed. This printer uses a floating mechanism to keep the printing platform level and operates multiple printheads simultaneously, thus increasing the printing speed. However, this 3D printer only has one material tray and can only print items made of the same material at a time. It cannot print items made of multiple different materials simultaneously, nor can it print composite materials. Therefore, this printer cannot meet the user's needs when printing composite material items, resulting in low practicality. Summary of the Invention

[0004] To address the problems in existing technologies, this invention proposes a composite 3D printer and its printing method, enabling the 3D printer to simultaneously print multiple items made of different materials as well as items made of composite materials; it solves the problem that most existing 3D printers are limited to single-material printing, resulting in low printing efficiency and low practicality.

[0005] The present invention is implemented as follows: A composite 3D printer includes a frame, within which a printing mechanism is provided. The printing mechanism includes a worktable, on which an X-axis drive module is provided, and a photopolymerization printing module and a fusion printing module are arranged side by side along the extension direction of the X-axis drive module. The photopolymerization printing module includes a first printing platform mounted on the worktable, with a scraper assembly above the first printing platform. The fusion printing module includes a second printing platform mounted on the worktable, with a nozzle assembly on the second printing platform. The nozzle assembly includes a Y-axis drive unit, and the output end of the Y-axis drive unit is provided with a nozzle unit. The X-axis drive module has output ends that correspond to and are independently controlled by the scraper assembly and the nozzle assembly, respectively, and the scraper assembly and the nozzle assembly are respectively mounted on the corresponding output ends of the X-axis drive module.

[0006] The photocuring printing module further includes a first feeding module and an optomechanical component. The first feeding module feeds material to the first printing platform, which is then coated by the coating component and cured by light exposure through the optomechanical component. The melt printing module further includes a second feeding module, which discharges material to the nozzle assembly, which sprays the material onto the first printing platform or the second printing platform.

[0007] When multiple items made of different materials need to be printed, the photopolymerization printing module and the fusion printing module print items made of different materials independently without interfering with each other, enabling the 3D printer to print multiple items made of different materials at the same time, thus improving the printing efficiency of the 3D printer.

[0008] When it is necessary to print composite material items, the scraper assembly and the nozzle assembly alternately print on the first printing platform, so that the scraper assembly prints the first material and the nozzle assembly prints the second material, enabling the 3D printer to print composite material items and improving the practicality of the 3D printer.

[0009] When multiple items made of different materials need to be printed, including items made of composite materials, the squeegee assembly and the nozzle assembly alternately print the first material and the second material on the first printing platform, respectively. Simultaneously, when the nozzle assembly does not need to print the second material on the first printing platform, it moves to the second printing platform to print items requiring only the second material. This improves the printing efficiency of the 3D printer and also avoids the cooling of the printing material within the nozzle assembly. This prevents the nozzle assembly from needing to remove the cooled and solidified printing material or reheat and melt it when printing again, thus reducing material waste and improving printing efficiency.

[0010] Preferably, the coating assembly includes symmetrically arranged scraper components, each scraper component including a scraper drive unit. The output end of the scraper drive unit is provided with a mounting plate, and the scraper drive unit drives the mounting plate to move up and down along the Z-axis. The mounting plate is provided with a blade, which extends along the Y-axis and moves synchronously with the mounting plate. Under the drive of the X-axis drive module, the blade extending along the Y-axis can efficiently coat the printing material on the first printing platform into a uniform plane, simplifying the material forming action and significantly improving printing efficiency. Furthermore, when the scraper component returns, the blade can be lifted synchronously with the mounting plate, effectively avoiding secondary coating, ensuring the consistency of coating quality, and enhancing the reliability of the coating assembly.

[0011] The coating assembly further includes a stroke adjustment unit and a buffer limiting unit. The output end of the stroke adjustment unit is equipped with an adjustable-length push rod, the extension length of which can be adjusted by rotation or sliding. The buffer limiting unit is adjustablely screwed onto the mounting plate, and the extension length of the buffer limiting unit beyond the mounting plate is adapted to the push rod. The stroke adjustment unit is used to adjust the height of the blade during coating, preventing the blade from being excessively pressed down and avoiding affecting the coating quality due to inconsistent blade height. The push rod allows for convenient adjustment of the blade's coating height during product changeovers, significantly improving operational convenience.

[0012] Preferably, the optomechanical assembly is mounted on one side of the coating assembly and includes a mounting base. The mounting base has a first adjusting member, the output end of which is adjustable along the Z-axis. First guiding members are also symmetrically arranged on both sides of the mounting base. The first adjusting member is used to adjust the size of the light spot formed by the optomechanical assembly, ensuring the light spot size matches the first printing platform. This avoids the light spot being too large, leading to reduced light intensity, or too small, preventing it from covering the first printing platform, thus improving the reliability of the optomechanical assembly. The first guiding member guides the light spot during adjustment, preventing jamming and center shift during adjustment, further improving the reliability of the first adjusting member.

[0013] Specifically, the photopolymerization printing module further includes an optical engine base mounted on the first adjusting member. The optical engine base includes a second adjusting member and an optical engine unit. The second adjusting member is adjustable along the Y-axis and is drively connected to the optical engine unit. The light-emitting surface of the optical engine unit faces the first printing platform. Symmetrically arranged second guide members are provided on both sides of the optical engine unit. The second guide members connect the optical engine unit and the optical engine base, and the second adjusting member is mounted on one of the second guide members. The second adjusting member is used to adjust the center position of the light spot, so that the center of the light spot coincides with the center of the first printing platform, further ensuring that the size of the light spot is adapted to the first printing platform.

[0014] Preferably, both the first and second printing platforms are equipped with Z-axis drive units. Each Z-axis drive unit drives the table surfaces of the first and second printing platforms to move up and down along the Z-axis. When the first and second printing platforms begin printing, their table surfaces are located at the highest limit of the Z-axis drive unit and gradually descend during the printing process. The Z-axis drive unit forms a sunken platform for the first and second printing platforms. When material is deposited by the platform sinking, the X-axis drive module and Y-axis drive unit do not need to rise or fall, reducing the suspended mass of the 3D printer and thus reducing the vibration generated during the movement of the X-axis drive module and Y-axis drive unit. Compared with the method of depositing material by raising the nozzle, this improves printing accuracy.

[0015] Preferably, the printhead assembly further includes a heating unit disposed at the nozzle of the printhead unit and surrounding the nozzle. The heating unit is used to heat the printing material at the printhead unit, preventing the printing material at the printhead unit from cooling and solidifying and clogging the printhead unit, thereby improving the reliability of the printhead unit.

[0016] Preferably, the X-axis drive module includes X-axis drive units arranged in parallel, and connecting plates corresponding to the coating assembly and the nozzle assembly, respectively. The corresponding output ends of each X-axis drive unit move synchronously, and each connecting plate is connected to the corresponding output end of the X-axis drive unit. The parallel arrangement of the X-axis drive units makes the driving force provided by the X-axis drive module more uniform, thereby reducing the risk of jamming of the coating assembly and the nozzle assembly and improving the reliability of the X-axis drive module.

[0017] Preferably, the first feeding module includes a first hopper and an extrusion component adapted to the first hopper, the output end of the extrusion component extending into the first hopper; the first feeding module also includes a first conveying pipe, the first conveying pipe connecting the first hopper and the first printing platform; the extrusion component is controlled by a motor to adjust the depth of its output end extending into the first hopper, thereby improving the feeding accuracy of the first feeding module, avoiding deviations in the size of printed items due to excessive feeding at one time, and thus improving printing accuracy.

[0018] The second feeding module includes a second material hopper corresponding to the printhead unit, and the second material hopper is connected to the printhead unit. The storage capacity of the second material hopper relative to the printhead unit reduces the frequency of adding printing material to the printhead unit, thereby improving the printing efficiency of the printhead unit.

[0019] A printing method, applied to the aforementioned composite 3D printer, includes the following steps:

[0020] S1: Determine the type and quantity of items to be printed;

[0021] S2-1: When multiple items made of different materials need to be printed, the photopolymerization printing module and the melt printing module independently print items made of different materials;

[0022] S2-2: When it is necessary to print articles made of composite materials, the scraper assembly and the nozzle assembly alternately print on the first printing platform, so that the scraper assembly prints the first material and the nozzle assembly prints the second material;

[0023] S2-3: When multiple items made of different materials need to be printed, and the items to be printed include items made of composite materials, the coating assembly and the nozzle assembly alternately print the first material and the second material on the first printing platform, respectively. At the same time, when the nozzle assembly does not need to print the second material on the first printing platform, the nozzle assembly moves to the second printing platform to print items that only require the second material.

[0024] Specifically, steps 2-3 include the following steps:

[0025] S2-3-1: Divide the object being printed on the first printing platform into multiple printing layers of uniform thickness;

[0026] S2-3-2: When the printed layer does not have a second material, the scraping assembly prints the printed layer on the first printing platform, and the nozzle assembly prints an article that only requires the second material on the second printing platform;

[0027] S2-3-3: When the printing layer has a first material and a second material, the printhead assembly first prints the portion of the printing layer with the second material on the first printing platform, and then the printhead assembly moves to the second printing platform to print or continue printing items that only require the second material; after the second material printed by the printhead assembly solidifies, the scraper assembly prints the portion of the printing layer with the first material; after the scraper assembly finishes printing, the photocuring printing module performs photocuring, and then the first printing platform descends, so that the top surface of the printed layer becomes the bottom surface of the printing layer to be printed;

[0028] S2-3-4: Repeat steps S2-3-2 and S2-3-3 until all printing layers are printed.

[0029] The beneficial effects of this invention are:

[0030] This invention proposes a composite 3D printer and its printing method, comprising two printing platforms. By printing simultaneously on the two platforms, the 3D printer can print multiple items made of different materials at the same time, thus improving the printing efficiency of the 3D printer. By printing alternately on the two platforms, the 3D printer can print items made of composite materials, or can print items made of composite materials and single materials at the same time, thus improving the practicality of the 3D printer. Attached Figure Description

[0031] Figure 1 This is an overall schematic diagram of the 3D printer of the present invention;

[0032] Figure 2 This is a schematic diagram of the printing mechanism of the 3D printer of the present invention;

[0033] Figure 3 This is an exploded view of the coating assembly of the 3D printer of the present invention;

[0034] Figure 4 This is an exploded view of the optomechanical components of the 3D printer of the present invention;

[0035] Figure 5 for Figure 4 An enlarged schematic diagram of point a;

[0036] Figure 6 This is a schematic diagram of the nozzle assembly of the 3D printer of the present invention;

[0037] Figure 7 This is a schematic diagram of the X-axis drive module of the 3D printer of the present invention.

[0038] Figure label:

[0039] 1. Frame; 2. Printing mechanism; 21. Worktable; 22. Photopolymerization printing module; 23. Melt-printing module; 24. X-axis drive module; 221. First printing platform; 222. Squeegee assembly; 223. Optomechanical assembly; 224. First feeding module; 231. Second printing platform; 232. Nozzle assembly; 233. Second feeding module; 241. X-axis drive unit; 242. Connecting plate; 2211. Z-axis drive unit; 2220 2221. Scraper component; 2222. Scraper drive unit; 2222. Mounting plate; 2223. Blade; 2224. Stroke adjustment unit; 2225. Buffer limit unit; 2231. Mounting base; 2232. First adjustment component; 2233. First guide component; 2234. Optomechanical base; 2235. Optomechanical unit; 2236. Second adjustment component; 2237. Second guide component; 2321. Y-axis drive unit; 2322. Nozzle unit. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Example 1

[0042] like Figures 1-7 As shown, a composite 3D printer includes a frame 1, a printing mechanism 2 inside the frame 1, and a worktable 21. The worktable 21 is provided with an X-axis drive module 24, and a photopolymerization printing module 22 and a melt printing module 23 are arranged side by side along the extension direction of the X-axis drive module 24. The photopolymerization printing module 22 includes a first printing platform 221 mounted on the worktable 21, and a scraper assembly 222 is provided above the first printing platform 221.

[0043] In this embodiment, the coating assembly 222 includes symmetrically arranged scraper components 2220. Each scraper component 2220 includes a scraper drive unit 2221. The output end of the scraper drive unit 2221 is provided with a mounting plate 2222. The scraper drive unit 2221 drives the mounting plate 2222 to move up and down along the Z-axis. The mounting plate 2222 is provided with a blade 2223, which extends along the Y-axis and moves synchronously with the mounting plate 2222. Under the drive of the X-axis drive module 24, the blade 2223 extending along the Y-axis can efficiently coat the printing material on the first printing platform 221 into a uniform plane, simplifying the material forming action and significantly improving printing efficiency. When the scraper component 2220 returns, the blade 2223 can be lifted synchronously with the mounting plate 2222, effectively avoiding secondary coating, ensuring the consistency of coating quality, and enhancing the reliability of the coating assembly 222.

[0044] The coating assembly 222 further includes a stroke adjustment unit 2224 and a buffer limiting unit 2225. The output end of the stroke adjustment unit 2224 is provided with an adjustable-length push rod, the extension length of which can be adjusted by rotation. The buffer limiting unit 2225 is adjustablely screwed onto the mounting plate 2222, and the extension length of the buffer limiting unit 2225 from the mounting plate 2222 is adapted to the push rod. The stroke adjustment unit 2224 is used to adjust the height of the blade 2223 during coating, preventing the blade 2223 from being excessively pressed down and avoiding affecting the coating quality due to inconsistent blade height. The push rod is used to conveniently adjust the coating height of the blade 2223 when changing products, significantly improving operational convenience.

[0045] In this embodiment, the stroke adjustment unit 2224 is a differential head; the buffer limit unit 2225 is a hydraulic damper.

[0046] The photocurable printing module 22 further includes a first feeding module 224 and an optomechanical assembly 223. The first feeding module 224 feeds material to the first printing platform 221, which is then coated by the coating assembly 222 and cured by light exposure through the optomechanical assembly 223. The melt printing module 23 further includes a second feeding module 233, which discharges material to the nozzle assembly 232, which sprays the material onto the first printing platform 221 or the second printing platform 231.

[0047] In this embodiment, the first feeding module 224 includes a first hopper and an extrusion member adapted to the first hopper, the output end of the extrusion member extending into the first hopper; the first feeding module 224 also includes a first conveying pipe, the first conveying pipe connecting the first hopper and the first printing platform 221; the extrusion member is controlled by a motor to extend its output end into the first hopper, which improves the feeding accuracy of the first feeding module 224, avoids excessive feeding at one time causing deviations in the size of the printed items, and thus improves the printing accuracy.

[0048] In this embodiment, the extrusion component is an electric cylinder.

[0049] The melt printing module 23 includes a second printing platform 231 mounted on the worktable 21. The second printing platform 231 is provided with a nozzle assembly 232. The nozzle assembly 232 includes a Y-axis drive unit 2321. The output end of the Y-axis drive unit 2321 is provided with the nozzle unit 2322.

[0050] In this embodiment, the printhead assembly 232 further includes a heating unit, which is disposed at the nozzle of the printhead unit 2322 and surrounds the nozzle. The heating unit is used to heat the printing material at the printhead unit 2322, preventing the printing material at the printhead unit 2322 from cooling and solidifying and clogging the printhead unit 2322, thereby improving the reliability of the printhead unit 2322.

[0051] In this embodiment, the heating unit is a heating ring.

[0052] In this embodiment, the second feeding module 233 includes a second material bin corresponding to the printhead unit 2322, and the second material bin is connected to the printhead unit 2322. The increased storage capacity of the second material bin in the printhead unit 2322 reduces the number of times printing material needs to be added to the printhead unit 2322, thereby improving the printing efficiency of the printhead unit 2322.

[0053] In this embodiment, the optomechanical assembly 223 is mounted on one side of the coating assembly 222 and includes a mounting base 2231. The mounting base 2231 is provided with a first adjusting member 2232, the output end of which is adjustable along the Z-axis. First guiding members 2233 are also symmetrically arranged on both sides of the mounting base 2231. The first adjusting member 2232 is used to adjust the size of the light spot formed by the optomechanical assembly 223, ensuring that the light spot size matches the first printing platform 221. This avoids the light spot being too large, leading to reduced light intensity, or too small, preventing it from covering the first printing platform 221, thus improving the reliability of the optomechanical assembly 223. The first guiding member 2233 guides the light spot during adjustment, preventing jamming and center deviation during adjustment, further improving the reliability of the first adjusting member 2232.

[0054] Specifically, the photopolymerization printing module 22 further includes an optical engine base 2234 mounted on the first adjusting member 2232. The optical engine base 2234 includes a second adjusting member 2236 and an optical engine unit 2235. The second adjusting member 2236 is adjustable along the Y-axis and is drively connected to the optical engine unit 2235. The light-emitting surface of the optical engine unit 2235 faces the first printing platform 221. Symmetrically arranged second guide members 2237 are provided on both sides of the optical engine unit 2235. The second guide members 2237 connect the optical engine unit 2235 and the optical engine base 2234. The second adjusting member 2236 is mounted on one of the second guide members 2237. The second adjusting member 2236 is used to adjust the center position of the light spot so that the center of the light spot coincides with the center of the first printing platform 221, further ensuring that the size of the light spot is adapted to the first printing platform 221.

[0055] The X-axis drive module 24 is provided with output terminals that correspond to and are independently controlled by the scraper assembly 222 and the nozzle assembly 232, respectively. The scraper assembly 222 and the nozzle assembly 232 are respectively installed on the corresponding output terminals of the X-axis drive module 24.

[0056] In this embodiment, the X-axis drive module 24 includes X-axis drive units 241 arranged in parallel, and connecting plates 242 corresponding to the coating assembly 222 and the nozzle assembly 232, respectively. The corresponding output ends of each X-axis drive unit 241 move synchronously, and each connecting plate 242 is connected to the corresponding output end of the X-axis drive unit 241. The parallel arrangement of the X-axis drive units 241 makes the driving force provided by the X-axis drive module 24 more uniform, thereby reducing the risk of jamming of the coating assembly 222 and the nozzle assembly 232 and improving the reliability of the X-axis drive module 24.

[0057] When multiple items made of different materials need to be printed, the photopolymerization printing module 22 and the fusion printing module 23 print items made of different materials independently without interfering with each other, enabling the 3D printer to print multiple items made of different materials at the same time, thus improving the printing efficiency of the 3D printer.

[0058] When it is necessary to print composite material items, the scraper assembly 222 and the nozzle assembly 232 alternately print on the first printing platform 221, so that the scraper assembly 222 prints the first material and the nozzle assembly 232 prints the second material, enabling the 3D printer to print composite material items and improving the practicality of the 3D printer.

[0059] When multiple items made of different materials need to be printed, including items made of composite materials, the squeegee assembly 222 and the nozzle assembly 232 alternately print the first material and the second material on the first printing platform 221, respectively. Simultaneously, when the nozzle assembly 232 does not need to print the second material on the first printing platform 221, it moves to the second printing platform 231 to print items requiring only the second material. This improves the printing efficiency of the 3D printer and also avoids the cooling of the printing material within the nozzle assembly 232. This prevents the need to remove the cooled and solidified printing material or reheat and melt it when the nozzle assembly 232 prints again, thus reducing material waste and improving printing efficiency.

[0060] In this embodiment, the first material is a photosensitive material; the second material is a thermoplastic material.

[0061] In this embodiment, both the first printing platform 221 and the second printing platform 231 are equipped with Z-axis drive units 2211. Each Z-axis drive unit 2211 drives the table surface of the first printing platform 221 and the second printing platform 231 to move up and down along the Z-axis. When the first printing platform 221 and the second printing platform 231 start printing, the table surface of the first printing platform 221 and the second printing platform 231 is located at the highest limit of the Z-axis drive unit 2211 and gradually descends during the printing process. The Z-axis drive unit 2211 makes the first printing platform 221 and the second printing platform 231 form a sunken platform. When material is accumulated by the platform sinking, the X-axis drive module 24 and the Y-axis drive unit 2321 do not need to be raised or lowered, reducing the hanging mass of the 3D printer and thus reducing the vibration generated by the movement of the X-axis drive module 24 and the Y-axis drive unit 2321. Compared with the method of accumulating material by the nozzle rising, the printing accuracy is improved.

[0062] In this embodiment, the X-axis drive unit 241, Y-axis drive unit 2321 and Z-axis drive unit 2211 are all linear modules.

[0063] Example 2

[0064] A printing method, applied to a composite 3D printer as described in Example 1, includes the following steps:

[0065] S1: Determine the type and quantity of items to be printed;

[0066] S2-1: When multiple items made of different materials need to be printed, the photopolymerization printing module 22 and the melt printing module 23 independently print items made of different materials;

[0067] S2-2: When an article requiring composite material is needed, the scraper assembly 222 and the nozzle assembly 232 alternately print on the first printing platform 221, so that the scraper assembly 222 prints the first material and the nozzle assembly 232 prints the second material.

[0068] S2-3: When multiple items made of different materials need to be printed, and the items to be printed include items made of composite materials, the scraping assembly 222 and the nozzle assembly 232 alternately print the first material and the second material on the first printing platform 221, respectively. At the same time, when the nozzle assembly 232 does not need to print the second material on the first printing platform 221, the nozzle assembly 232 moves to the second printing platform 231 to print items that only require the second material.

[0069] Specifically, steps 2-3 include the following steps:

[0070] S2-3-1: The object printed on the first printing platform 221 is divided into multiple printing layers of uniform thickness;

[0071] S2-3-2: When the printed layer does not have a second material, the scraping assembly 222 prints the printed layer on the first printing platform 221, and the nozzle assembly 232 prints an article that only requires the second material on the second printing platform 231.

[0072] S2-3-3: When the printing layer has a first material and a second material, the nozzle assembly 232 first prints the portion of the printing layer with the second material on the first printing platform 221, and then the nozzle assembly 232 moves to the second printing platform 231 to print or continue printing items that only require the second material; after the second material printed by the nozzle assembly 232 solidifies, the scraper assembly 222 prints the portion of the printing layer with the first material; after the scraper assembly 222 finishes printing, the photocuring printing module 22 performs photocuring, and then the first printing platform 221 descends, so that the top surface of the printed layer becomes the bottom surface of the printing layer to be printed;

[0073] S2-3-4: Repeat steps S2-3-2 and S2-3-3 until all printing layers are printed.

[0074] Based on the disclosure and teachings of the foregoing specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the invention should also fall within the protection scope of the claims of the present invention. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the present invention.

Claims

1. A composite 3D printer comprising a frame, a printing mechanism is arranged in the frame, characterized in that: The printing mechanism comprises a workbench, an X-axis driving module provided on the workbench, and a light-curing printing module and a melting printing module provided side by side along the extension direction of the X-axis driving module, the light-curing printing module comprises a first printing platform mounted on the workbench, and a doctor blade assembly is provided above the first printing platform; the melting printing module comprises a second printing platform mounted on the workbench, and a nozzle assembly is provided on the second printing platform, the nozzle assembly comprises a Y-axis driving unit, and a nozzle unit is provided at the output end of the Y-axis driving unit; the X-axis driving module is provided with output ends corresponding to the doctor blade assembly and the nozzle assembly respectively and independently controlled, and the doctor blade assembly and the nozzle assembly are mounted on the corresponding output ends of the X-axis driving module respectively. The light-curing printing module further comprises a first feeding module and a light machine assembly, the first feeding module feeds to the first printing platform, after being scraped by the doctor blade assembly, and is cured by the light machine assembly; the melting printing module further comprises a second feeding module, the second feeding module discharges to the nozzle assembly, and is sprayed to the first printing platform or the second printing platform by the nozzle assembly. When multiple different materials are needed to print the objects, the light-curing printing module and the melting printing module independently print the objects of different materials respectively. When a composite material is needed to print the objects, the doctor blade assembly and the nozzle assembly alternately print on the first printing platform, so that the doctor blade assembly prints a first material, and the nozzle assembly prints a second material. When multiple different materials are needed to print the objects, and the printed objects include the objects of the composite material, the doctor blade assembly and the nozzle assembly alternately print the first material and the second material on the first printing platform respectively, and when the nozzle assembly does not need to print the second material on the first printing platform, the nozzle assembly goes to the second printing platform to print the objects of the second material only.

2. The composite 3D printer of claim 1, wherein: The doctor blade assembly comprises symmetrically arranged doctor blade members, the doctor blade members comprise a doctor blade driving unit, an installation plate is provided at the output end of the doctor blade driving unit, and the installation plate moves up and down along the Z-axis driven by the doctor blade driving unit; a blade is provided on the installation plate, the blade extends along the Y-axis direction and moves synchronously with the installation plate; The doctor blade assembly further comprises a stroke adjusting unit and a buffer limiting unit, an adjustable length top rod is provided at the output end of the stroke adjusting unit, and the extension length of the top rod is adjusted by rotation or sliding; the buffer limiting unit is rotatably connected to the installation plate in an adjustable manner, and the length of the buffer limiting unit extending from the installation plate is matched with the top rod.

3. The composite 3D printer of claim 1, wherein: The light machine assembly is mounted on one side of the doctor blade assembly, comprises a mounting seat, a first adjusting member is provided on the mounting seat, and the output end of the first adjusting member is adjustable along the Z-axis direction; first guide members are symmetrically provided on both sides of the mounting seat.

4. The composite 3D printer of claim 3, wherein: The light-curing printing module further comprises a light base mounted on the first adjusting member, the light base comprising a second adjusting member and a light machine unit, the second adjusting member being adjustable along the Y-axis direction and being in transmission connection with the light machine unit, and an out-light surface of the light machine unit facing the first printing platform; the light machine unit is provided with symmetrically arranged second guide members on both sides, the second guide members connecting the light machine unit and the light base, and the second adjusting member being mounted on one of the second guide members.

5. The composite 3D printer of claim 1, wherein: The first printing platform and the second printing platform are both provided with Z-axis driving units, each Z-axis driving unit driving the table top of the first printing platform and the second printing platform to move up and down along the Z-axis; when the first printing platform and the second printing platform start printing, the table top of the first printing platform and the second printing platform is located at the highest limit of the Z-axis driving unit and gradually descends during printing.

6. The composite 3D printer of claim 1, wherein: The nozzle assembly further comprises a heating unit, which is arranged at the nozzle of the nozzle unit and surrounds the nozzle.

7. The composite 3D printer of claim 1, wherein: The X-axis driving module comprises X-axis driving units arranged side by side, and connecting plates corresponding to the blade coating assembly and the nozzle assembly respectively, the corresponding output ends of each X-axis driving unit moving synchronously, and each connecting plate connecting the corresponding output end of the X-axis driving unit.

8. The composite 3D printer of claim 1, wherein: The first feeding module comprises a first material bin and an extrusion member matched with the first material bin, the output end of the extrusion member extending into the first material bin; the first feeding module further comprises a first material conveying pipe connecting the first material bin and the first printing platform. The second feeding module comprises a second material bin corresponding to the nozzle unit, and the second material bin is connected with the nozzle unit.

9. A printing method applied to the composite 3D printer of any one of claims 1-8, characterized in that: The method comprises the following steps: S1: determining the type and quantity of the objects to be printed; S2-1: when the objects to be printed are made of different materials, the light-curing printing module and the fused deposition printing module independently print the objects made of different materials respectively; S2-2: when the objects to be printed are made of composite materials, the blade coating assembly and the nozzle assembly alternately print on the first printing platform, the blade coating assembly prints the first material, and the nozzle assembly prints the second material; S2-3: when the objects to be printed are made of different materials and the objects to be printed include objects made of composite materials, the blade coating assembly and the nozzle assembly alternately print the first material and the second material on the first printing platform respectively, and when the nozzle assembly does not need to print the second material on the first printing platform, the nozzle assembly goes to the second printing platform to print the objects made of the second material only.

10. A printing method according to claim 9, wherein: S2-3 specifically comprises the following steps: S2-3-1: dividing the objects printed on the first printing platform into a plurality of printing layers with uniform thickness; S2-3-2: when the printing layer does not have the second material, the blade coating assembly prints the printing layer on the first printing platform, and the nozzle assembly prints the objects made of the second material only on the second printing platform; S2-3-3: when the printing layer has a first material and a second material, the printhead assembly first prints the part of the printing layer of the second material on the first printing platform, then the printhead assembly moves to the second printing platform to print or continue to print the object only with the second material; the blade coating assembly prints the part of the printing layer of the first material after the second material printed by the printhead assembly on the first printing platform solidifies; after the blade coating assembly finishes printing, the photocuring printing module performs photocuring, and then the first printing platform is lowered to form the top surface of the printed printing layer into the bottom surface of the printing layer to be printed; S2-3-4: repeat steps S2-3-2 and S2-3-3 until all the printing layers are printed.

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