UV-curing 3D printing equipment for integrally forming core and shell and preparation method of product

Abstract

The present invention provides a light-curing 3D printing device for integrally forming a core and a shell and a preparation method of a product. The device includes a forming table, a printing tank, and a light-curing unit. The slurry can be disposed on the printing tank, and the forming table can move towards the printing tank to form the slurry. During the forming process, the light-curing unit can scan the slurry on the printing tank. There are at least two light-curing units, and different light-curing units act on the slurry in different regions of the printing tank, and different light-curing units can provide at least one of different laser powers, different scanning paths, and different scanning speeds to cure and form the slurry in different regions; the slurry is a ceramic material. According to the present invention, the integral forming of structures with different performance requirements such as cores and shells can be realized, and the requirements of investment casting for the integral forming of ceramic cores and shells can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of precision casting auxiliary material production, and particularly relates to a method for preparing a light-curing 3D printing core and shell integrated forming device and product. Background Art

[0002] In the field of high-end equipment such as aeroengines, precision and complex hollow blades mainly adopt the investment precision casting process. The ceramic core is a key link determining the performance and quality of the prepared hollow blade. However, the traditional hot pressing process for preparing the core requires a large number of molds, high tooling costs, a long production cycle, many process flows, and a low finished product rate. As the internal cooling channels of hollow components such as turbine blades in aeroengines become more and more complex, the traditional core preparation process faces huge challenges. Therefore, there is an urgent need to develop a process with a short process flow, low cost, and capable of quickly preparing complex structure ceramic cores to improve the quality and manufacturing efficiency of hollow blades with complex internal cavity structures.

[0003] Facing the urgent demand for high-performance, high-precision complex structure castings in the field of high-end equipment manufacturing, the light-curing 3D printing ceramic technology integrates design and manufacturing and does not require tooling molds, providing an effective way for the preparation of complex structure ceramic cores. However, when applying this technology to complex structure ceramic molds, due to the different requirements of the core and shell in the mold, that is, the core requires high high-temperature strength and precision requirements, but the shell requires high air permeability, the existing light-curing 3D printing equipment and processes cannot fully meet the requirements of investment precision casting for the integrated forming of ceramic cores and shells.

[0004] Due to the technical problems such as the existing light-curing 3D printing equipment and processes not being able to fully meet the requirements of investment precision casting for the integrated forming of ceramic cores and shells due to the different requirements of the core and shell in the ceramic mold during the existing technology, the present invention researches and designs a method for preparing a light-curing 3D printing core and shell integrated forming device and product. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the existing light-curing 3D printing equipment and processes cannot meet the requirements of investment precision casting for the integrated forming of ceramic cores and shells, so as to provide a method for preparing a light-curing 3D printing core and shell integrated forming device and product.

[0006] To solve the above problems, the present invention provides a light-curing 3D printing device for integrally forming a core and a shell, which includes: a forming table, a printing tank, and a light-curing unit. The slurry can be disposed on the printing tank, and the forming table can move towards the printing tank to form the slurry. During the forming process, the light-curing unit can scan the slurry on the printing tank. The printing tank includes a first region and a second region. There are two light-curing units, including a first light-curing unit and a second light-curing unit. The first light-curing unit is opposite to the first region to scan the slurry on the first region, and the second light-curing unit is opposite to the second region to scan the slurry on the second region. At least one of different laser powers, different scanning paths, and different scanning speeds can be provided between the first light-curing unit and the second light-curing unit. The slurry is a ceramic material. The ceramic material on the first region can be jointly formed into a ceramic core by the first light-curing unit and the forming table, and the ceramic material on the second region can be jointly formed into a ceramic shell by the second light-curing unit and the forming table.

[0007] In some embodiments, the light-curing unit includes a reflective galvanometer and a laser. The laser can emit light to the reflective galvanometer, and the reflective galvanometer can receive the light emitted by the laser and reflect the light onto the slurry in the printing tank to form a curing light path for curing and forming the slurry. When there are at least two light-curing units, there are at least two reflective galvanometers and at least two lasers, and the reflective galvanometers and the lasers are arranged in one-to-one correspondence.

[0008] In some embodiments, the light-curing unit is an ultraviolet light-curing unit, and the laser is an ultraviolet laser. The ultraviolet laser can emit ultraviolet light to the reflective galvanometer, and the reflective galvanometer can receive the ultraviolet light emitted by the ultraviolet laser and reflect the ultraviolet light onto the slurry in the printing tank.

[0009] In some embodiments, the forming table is located above the printing tank and can move downward to act on the slurry on the printing tank to form the slurry. The light-curing unit is located below the printing tank and can emit light upward to act on the slurry on the printing tank.

[0010] In some embodiments, it further includes a printing support table. The printing support table supports the lower end and / or the side end of the printing tank. The printing tank includes a frame structure, and there is a through groove structure in the middle of the frame structure. The area of the through groove structure can be scraped with slurry, and the through groove structure can receive the scanning light emitted by the light-curing unit below.

[0011] In some embodiments, it further includes a slurry storage - scraping auxiliary system, which is arranged in the through - groove structure of the printing tank to scrape the slurry in the through - groove structure and can also store the slurry.

[0012] In some embodiments, it further includes a formed body separation system, which is arranged in the through - groove structure and above the slurry storage - scraping auxiliary system to separate the formed body from the slurry.

[0013] In some embodiments, it further includes a frame, an integrated control module and a printing layer thickness control system. The photocuring unit, the printing support table, the printing layer thickness control system and the integrated control module are all arranged on the frame. The formed body is connected to the printing layer thickness control system, and the printing layer thickness control system can control the up - and - down movement distance and speed of the formed body. The integrated control module is electrically connected to the printing layer thickness control system, the photocuring unit and the slurry storage - scraping auxiliary system respectively.

[0014] The present invention also provides a preparation method for a multi - performance material photocuring 3D printing product, which includes:

[0015] A stirring and drying step of mixing and stirring the material powder and then obtaining a mixed powder body through drying;

[0016] A slurry preparation step of adding the above - mentioned mixed powder body into a photocuring resin, heating to a preset temperature and then keeping warm and stirring for a preset time to obtain a photocuring 3D printing slurry;

[0017] A 3D printing and integral forming step of using the aforementioned photocuring 3D printing core - shell integral forming device to print the photocuring 3D printing slurry to obtain a 3D printing integral green body;

[0018] A debinding and sintering step of debinding and sintering the 3D printing integral green body to obtain a photocuring 3D printing integral component.

[0019] A photocuring 3D printing core - shell integral forming device and a preparation method for a product provided by the present invention have the following beneficial effects:

[0020] The present invention can integrally form structures with different performance requirements such as cores and shells by setting more than two photocuring units, where different photocuring units act on slurries in different areas of the printing tank, and different photocuring units can provide different laser powers, different scanning paths, and different scanning speeds, so as to cure the slurries in different areas of the printing tank into different material structure properties, such as layered structures with different pore distributions, etc. This meets the demand for the integral forming of ceramic cores and shells in investment casting. Through the synchronous curing and forming of the double-light path of photocuring 3D printing in the present invention, the printing is made more efficient. Since the cores and shells use slurries prepared from the same material for their differential forming, the cost and cycle are greatly reduced. During the printing process, there is no need to replace the print head and slurry, avoiding the introduction of other impurity elements in the material, and the product quality is stable and the process is reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the integral forming equipment for the core and shell of photocuring 3D printing according to the present invention.

[0022] The reference numerals are shown as:

[0023] 1, frame; 2, forming table; 3, printing tank; 4, printing support table; 5, reflecting galvanometer; 6, laser; 7, integrated control module; 8, slurry storage - scraping and assisting system; 9, formed body separation system; 10, printing layer thickness control system; 100, photocuring unit; 101, first photocuring unit; 102, second photocuring unit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] As Figure 1 shown, the present invention provides an integral forming equipment for the core and shell of photocuring 3D printing, which includes:

[0025] A forming table 2, a printing tank 3 and a light curing unit 100 are provided. The slurry can be disposed on the printing tank 3. The forming table 2 can move towards the printing tank 3 to form the slurry. During the forming process, the light curing unit 100 can scan the slurry on the printing tank 3. The printing tank 3 includes a first region and a second region. There are two light curing units 100, including a first light curing unit 101 and a second light curing unit 102. The first light curing unit 101 is opposite to the first region to scan the slurry on the first region, and the second light curing unit 102 is opposite to the second region to scan the slurry on the second region. At least one of different laser powers, different scanning paths and different scanning speeds can be provided between the first light curing unit 101 and the second light curing unit 102. The slurry is a ceramic material. The ceramic material on the first region can be jointly acted on by the first light curing unit 101 and the forming table 2 to form a ceramic core, and the ceramic material on the second region can be jointly acted on by the second light curing unit 102 and the forming table 2 to form a ceramic shell.

[0026] In the present invention, by providing more than two light curing units, and different light curing units act on the slurries in different regions of the printing tank, and different light curing units can provide different laser powers, different scanning paths and different scanning speeds, so that the slurries in different regions of the printing tank can be cured and formed into different material structure properties, such as a layered structure with different pore distributions, etc., thereby realizing the integral forming of structures with different performance requirements such as cores and shells, and meeting the requirements of investment casting for the integral forming of ceramic cores and shells. In the present invention, through the synchronous curing and forming of the double light paths of light curing 3D printing, the printing is made more efficient. Since the cores and shells use the slurry prepared from the same material for their differential forming, the cost and cycle are greatly reduced. During the printing process, there is no need to replace the print head and the slurry, avoiding the introduction of other impurity elements in the material, and the product quality is stable and the process is reliable.

[0027] The printing tank of the present invention includes a first and a second region, and the light curing unit includes a first and a second light curing unit. The first light curing unit is opposite to the first region to scan and print the slurry on the first region, and the second light curing unit is opposite to the second region to scan and print the slurry on the second region. Since at least one of the laser power, scanning path and scanning speed between the first and the second light curing units is different, the internal materials and structures of the formed structures of the first and the second regions scanned by the first and the second light curing units are also different, such as different pore distributions inside, that is, the effect of realizing different internal structures of different regions on the same structure by integral forming is effectively achieved.

[0028] The ceramic material of the present invention refers to a class of inorganic non-metallic materials made from natural or synthetic compounds through shaping and high-temperature sintering. It has the advantages of high melting point, high hardness, high wear resistance, oxidation resistance, etc. It can be used as a structural material and a cutting tool material. Due to certain special properties of ceramics, it can also be used as a functional material. That is, a ceramic core is formed on the first region through a first light-curing unit, and a ceramic shell is formed on the second region through a second light-curing unit to complete the integral molding of a ceramic structure with different internal structures (such as different porosities).

[0029] The printing tank of the present invention is further preferably rectangular in projection on a horizontal plane, having a long side and a short side, and the first region and the second region are formed at different positions in the direction of its long side.

[0030] Although the core and shell of the prior art can be integrally formed, they cannot achieve structural differentiation between the core and the shell. The problem to be solved by the present invention is precisely: the integrated molding equipment and process problems of the core and shell with differential properties, and obtaining the core and shell with differential properties.

[0031] Based on the above problems, the present invention proposes a device and a preparation method for integrally forming a ceramic core-shell by light-curing 3D printing to rapidly prepare a core and a shell with differential properties formed integrally.

[0032] The purpose of the present invention is to provide a device and a preparation method for integrally forming a ceramic core-shell by light-curing 3D printing. The device includes: a frame, a detachable forming table, a printing tank, a printing support table, an independent double-reflection galvanometer, a dual-control ultraviolet laser, an intelligent integrated control module, a slurry storage-scraping auxiliary system, a formed body separation system, and a printing layer thickness control system. The independent double-reflection galvanometer is installed directly below the detachable forming table and the printing tank. The dual-control ultraviolet laser is installed beside the independent double-reflection galvanometer at the bottom of the frame. The printing tank is installed in the middle of the frame through the printing support table. A detachable forming table that is controlled by the printing layer thickness control system and can move up and down is installed directly above the printing tank. The intelligent integrated control module controls the power, movement speed, and moving distance of the independent double-reflection galvanometer, the dual-control ultraviolet laser, the printing layer thickness control, and the slurry storage-scraping auxiliary system.

[0033] The light-curing 3D printer for integrally forming a ceramic core-shell of the present invention uses two groups of independently controlled ultraviolet lasers and galvanometers to simultaneously scan two ultraviolet laser beams with different powers, different scanning paths, and different scanning speeds on the same printing plane, so that the core and the shell in the forming area exhibit different pore distributions and layered structure characteristics, thereby realizing the differential preparation of the integral forming of the core-shell.

[0034] The device of the present invention utilizes two independently controllable light beams, with different scanning times, scanning powers, and scanning paths for the light beams, thereby causing differences in the microstructure and properties of the core and shell regions on each printing layer, so as to meet the usage requirements at one time.

[0035] In some embodiments, the photocuring unit 100 includes a galvanometer scanner 5 and a laser 6. The laser 6 can emit light to the galvanometer scanner 5, and the galvanometer scanner 5 can receive the light emitted by the laser and reflect the light onto the slurry in the printing tank 3 to form a curing light path for curing the slurry into a shape; when there are at least two photocuring units 100, there are at least two galvanometer scanners 5 and at least two lasers 6, and the galvanometer scanners 5 and the lasers 6 are arranged in one-to-one correspondence, forming a cooperative structure of double galvanometer scanners and double-controlled lasers.

[0036] This is a preferred structural form of the photocuring unit of the present invention. The double-controlled laser can emit a laser beam, and further, the double mirrors can reflect the light beam onto the slurry in the printing tank to scan the slurry during the printing process, thereby completing the 3D printing effect of photocuring forming; further, one photocuring unit includes a laser and a galvanometer scanner in one-to-one correspondence, and the other photocuring unit includes another pair of a laser and a mirror in one-to-one correspondence, so as to achieve different scanning effects on the slurries in different regions of the printing tank, so as to obtain a layered structure with different pore distributions between different regions, preferably for fabricating a core and a shell, and completing the integrated fabrication of a ceramic profile structure with different internal structures.

[0037] In some embodiments, the photocuring unit 100 is an ultraviolet photocuring unit, the laser 6 is an ultraviolet laser, the ultraviolet laser can emit ultraviolet light to the galvanometer scanner 5, and the galvanometer scanner 5 can receive the ultraviolet light emitted by the ultraviolet laser and reflect the ultraviolet light onto the slurry in the printing tank 3. This is a further preferred structural form of the photocuring unit of the present invention, that is, preferably an ultraviolet laser, which can emit an ultraviolet light beam, and the ultraviolet light beam is reflected onto the slurry on the printing tank through an independent galvanometer scanner, realizing fast and effective 3D printing by photocuring.

[0038] The independent double galvanometer scanners of the present invention are preferably installed directly below the detachable forming table and the printing tank, and are composed of two high-precision laser galvanometer scanners. The intelligent integrated control module controls the mirror angles and the angle change rates, and independently controls the scanning paths and scanning speeds of the two ultraviolet light beams.

[0039] The dual-controlled ultraviolet laser of the present invention is preferably installed at the bottom of the frame and consists of two lasers, which are mainly used to generate and control the intensity of ultraviolet light. The two lasers are independently controlled by an intelligent controller and are used to control the ultraviolet laser intensity of different molding areas when printing multi-performance ceramic materials at different positions of the same component.

[0040] Preferably, the angle between the emitted ultraviolet lasers of the two reflective galvanometers and the forming table is 59°-90°.

[0041] In some embodiments, the molding table 2 is located above the printing slot 3 and can move downward to act on the slurry on the printing slot 3 to shape the slurry, and the light curing unit 100 is located below the printing slot 3 and can release light upward to act on the slurry on the printing slot 3. This is the preferred positional relationship of the molding table, the printing slot and the light curing unit of the present invention, that is, the molding table is preferably located above the printing slot and moves from top to bottom to shape the slurry on the printing slot. After the molding of one layer of structure is completed, the molding table moves from bottom to top to separate from the slurry, so as to scrape the next layer of slurry, and then the molding table moves downward to achieve the molding of the next layer. Each time the molding table moves downward, the molding of a layer of slurry structure is completed, and at the same time, the light curing unit is located below, and the slurry is scanned during the molding process to achieve the effect of single-layer 3D printing.

[0042] In some embodiments, a printing support table 4 is further included, and the printing support table 4 is supported at the lower end and / or the side end of the printing slot 3, and the printing slot 3 includes a frame structure, and a through-slot structure is provided in the middle of the frame structure, and the area of the through-slot structure can be scraped with slurry, and the through-slot structure can receive scanning light emitted from the light-curing unit 100 below. The present invention can also effectively support the printing slot through the structure of the printing support table. The printing slot is a frame structure, and an internal through-slot structure can be formed. The through-slot structure can be scraped with slurry, and the light emitted by the light-curing unit is scanned below, and the slurry is formed by the downward movement of the forming table above. Of course, there are preferably multiple through-slot structures, and supporting ribs can be provided between adjacent through-slot structures to effectively support the slurry.

[0043] The printing tank of the present invention is preferably a detachable bottomless container, the middle of the printing tank clamps the forming body separation system by mechanical bolts, and the cavity formed by the printing tank and the forming body separation system is used to carry the single-layer slurry layer to be printed. Preferably, the maximum forming position of the forming support table of the present invention when curing the forming surface and the angle between the ultraviolet laser are 59°-90°.

[0044] In some embodiments, it further includes a slurry storage - scraping auxiliary system 8. The slurry storage - scraping auxiliary system 8 is arranged in the through - groove structure of the printing tank 3 to scrape the slurry in the through - groove structure and also store the slurry. The present invention can also provide slurry to the through - groove structure through the slurry storage - scraping auxiliary system, scrape a layer of slurry in the through - groove structure in a scraping manner, and with the downward pressing of the forming platform and the ultraviolet light scanning below, form a layer of 3D - printed structure. The slurry storage - scraping auxiliary system can also store the slurry to provide the slurry required for 3D printing.

[0045] The slurry storage - scraping auxiliary system of the present invention preferably includes a U - shaped double - edge scraper, a motor, a lead screw, and a slider. The "U - shaped" cavity of the U - shaped double - edge scraper is used to store the slurry and supplement it on the forming surface through the double edges during the scraping process. The motor, lead screw, and slider realize the forward and backward constant - speed scraping movement of the scraper.

[0046] In some embodiments, it further includes a formed body separation system 9. The formed body separation system 9 is arranged in the through - groove structure and above the slurry storage - scraping auxiliary system 8 to separate the forming platform 2 from the slurry. The present invention also has a formed body separation system, which is arranged above the slurry storage - scraping auxiliary system. After the forming platform moves downward to press the slurry into a printed structure layer by layer, the formed body separation system can effectively separate the forming platform from the slurry, preventing the formed single - layer structure from being lifted by the forming platform or adhering to the forming platform, and improving the printing effect.

[0047] The formed body separation system of the present invention preferably includes a layer of light - transmissive plastic film, which is tightened by the printing tank and realizes the release of the formed body through the resilience of the film.

[0048] Preferably, the light - transmissive plastic film of the formed body separation system of the present invention is any one of polyethylene, polypropylene, polystyrene, and polyvinyl chloride, and the thickness is 100μm - 1000μm.

[0049] In some embodiments, it further includes a frame 1, an integrated control module 7, and a printing layer thickness control system 10. The light - curing unit 100, the printing support platform 4, the printing layer thickness control system 10, and the integrated control module 7 are all arranged on the frame 1. The forming platform 2 is connected to the printing layer thickness control system 10. The printing layer thickness control system 10 can control the up - and - down movement distance and speed of the forming platform 2. The integrated control module 7 is electrically connected to the printing layer thickness control system 10, the light - curing unit 100, and the slurry storage - scraping auxiliary system 8 respectively.

[0050] The present invention can also provide a support frame for the light curing unit, the printing support table, the printing layer thickness control system and the integrated control module through the frame. The printing layer thickness control system is connected to the forming table to control the speed and distance of the movement of the forming table, so as to control the thickness of the single-layer and multi-layer printing structures. The integrated control module can effectively control the thickness of the printing layer, the scanning speed, the scanning power, the change of the scanning path, and can also control the volume of the slurry provided by the scraping system and the scraping speed, etc., effectively completing the intelligent and effective control of the light curing 3D printing integrated forming equipment.

[0051] The printing layer thickness control system of the present invention preferably includes a motor, a lead screw and a slider, which are connected to the slide rail on the back of the frame and can slide up and down along the guide rail to ensure the accurate position of the detachable forming table connected thereto and the accurate thickness of the single-layer printing. The detachable forming table of the present invention is connected to the printing layer thickness control system, and its bottom plane is parallel to the printing support table and is located directly above the printing tank, and is used to carry and lift the components formed by light curing.

[0052] Preferably, the cumulative control error of the printing layer thickness control system of the present invention in the height direction of the cured and formed part is 0-5 μm.

[0053] Preferably, the printing power of the light beams 1 and 2 of the present invention is 0-100 nW / cm 2 ;

[0054] Preferably, the scanning speed of the ultraviolet light beam of the present invention is 0-0.8 m / s;

[0055] Preferably, the scraping speed of the scraper of the present invention is 0-0.1 m / s;

[0056] Preferably, the single-layer printing thickness of the present invention is 25-500 μm.

[0057] The intelligent integrated control module of the present invention preferably includes a control module, a display module and a data input-output module. This module controls the independent double reflection galvanometer, the dual-control ultraviolet laser, the slurry storage-scraping auxiliary system, and the printing layer thickness control system through electrical signals, and realizes the control of the angle and the angle change rate of the independent double reflection galvanometer, the output power and the power change rate of the dual-control ultraviolet laser, the running speed of the scraper of the slurry storage-scraping auxiliary system, and the up and down movement distance and speed of the printing layer thickness control system.

[0058] Embodiment

[0059] Such as Figure 1As shown in the figure, a device for integrally forming a photocuring 3D printed ceramic core and shell includes: a frame 1; a detachable forming table 2; a printing tank 3; a printing support table 4; two independent galvanometric mirrors 5 (the function is to control the scanning path and scanning speed of the light beam); a laser 6 (preferably an ultraviolet laser); an intelligent integrated control module 7; a slurry storage and scraping auxiliary system 8; a formed body separation system 9; a printing layer thickness control system 10. The middle part of the frame 1 fixes the printing tank 3 at the center of the frame 1 through the printing support table 4, and fixes the formed body separation system 9 (using a polyethylene film) tightly with mechanical bolts through the printing tank 3. The slurry storage and scraping auxiliary system 8 is installed inside the printing tank 3; two independent galvanometric mirrors are installed at the bottom of the frame 1 directly below the printing tank 3, and a dual-control laser is also installed at the bottom of the frame 1; the printing layer thickness control system 10 is installed through the slide rail on the back of the frame 1, and the detachable forming table 2 is installed in the movable dovetail groove of the printing layer thickness control system 10 directly above the printing tank 3; the intelligent integrated control module 7 is installed outside the frame through a hinge connection, and is connected to the two independent galvanometric mirrors 5, the dual-control laser 6, the slurry storage and scraping auxiliary system 8, and the printing layer thickness control system 10 through wires to control the power, scanning path and scanning speed of the two ultraviolet laser beams, and control the feeding scraping speed and the single-layer printing thickness.

[0060] The printing tank 3 of the present invention is a tank with an open bottom, which has two functions. One is to enclose the surrounding slurry, and the second is to hold the separation membrane of the formed body separation system 9. The function of the formed body separation system 9 is to separate the formed body from the high-transparency glass plate at the bottom of the printing tank 3; the formed body separation system 9 is preferably an elastic membrane, and when the forming table 2 moves upward, the formed body moves upward with this membrane, and separation is carried out through the elasticity of this membrane.

[0061] The present invention also provides a preparation step for a photocuring 3D printed product of multi-performance materials, which includes:

[0062] Stirring and drying step: Mix and stir the material powder, and then obtain the mixed powder through drying.

[0063] Slurry preparation step: Add the above-mentioned mixed powder to the photocuring resin, heat it to a preset temperature and keep it warm and stir for a preset time to obtain the photocuring 3D printing slurry.

[0064] 3D printing integral forming step: Use the aforementioned photocuring 3D printed core and shell integral forming device to print the photocuring 3D printing slurry to obtain a 3D printed integral green body.

[0065] Debinding and sintering step: Debind and sinter the 3D printed integral green body to obtain a photocuring 3D printed integral component.

[0066] The beneficial effects of the equipment and preparation method for integrally forming a photocuring 3D printing ceramic core and shell provided by the present invention are as follows:

[0067] 1. The synchronous curing and forming of the double light paths in photocuring 3D printing are realized, making the printing more efficient.

[0068] 2. Since two ultraviolet laser devices and two high-precision laser reflection galvanometers constitute two ultraviolet light curing light paths, which are independently controlled by an intelligent integrated control module, the curing and forming with different laser powers, different scanning paths, and different scanning speeds can be carried out synchronously in the core and shell areas of the same printing layer. The layered structure of the pore distribution in different areas is controlled by the power, scanning path, and scanning speed, so as to realize the integral forming of the differential performance requirements of the core and shell.

[0069] 3. Since the core and shell use the slurry prepared from the same material for their differential forming, the cost and cycle are greatly reduced; during the printing process, there is no need to replace the print head and slurry, avoiding the introduction of other impurity elements in the material, and the product quality is stable and the process is reliable.

[0070] The material of the present invention is preferably a ceramic material, that is, the preparation steps of the photocuring 3D printing of the multi-property ceramic material specifically include the following steps:

[0071] (1) Mix and stir the ceramic powder for 2 - 3 h, and dry to obtain a mixed powder.

[0072] (2) Add the obtained mixed powder into the photocuring resin, keep it warm and stir at 80 - 120 °C for 8 - 12 h to obtain a photocuring 3D printing ceramic slurry.

[0073] (3) Use the equipment for integrally forming a photocuring 3D printing ceramic core and shell to carry out printing, set the printing power, printing path, and scanning speed of different path segments, the scraping speed of the blade, and the single-layer printing thickness of the light beams 1 and 2, so that the light beam 1 prints the core and the light beam 2 prints the external shell structure, and layer-by-layer curing and forming of the slurry is carried out through the 3D printing equipment to obtain a photocuring 3D printing ceramic core and shell green body.

[0074] (4) Debind and sinter the photocuring 3D printing ceramic green body obtained in step (3) to obtain a photocuring 3D printing ceramic core and shell integral component.

[0075] The further preferred embodiment of the preparation steps is as follows:

[0076] The preparation steps of the photocuring 3D printing differential integral forming ceramic core and shell of the present invention specifically include the following steps:

[0077] (1) Mix and stir the ceramic powder for 3 h, and dry to obtain a mixed powder.

[0078] (2) Add the obtained mixed powder into the photocurable resin, and carry out heat preservation stirring at 120 °C for 10 h to obtain a photocurable 3D printing ceramic slurry;

[0079] (3) Use the equipment for integral forming of photocurable 3D printing ceramic core-shell to print, and respectively set the printing paths of beam 1 and beam 2, so that beam 1 scans the forming area of the shell and beam 2 scans the forming area of the core. Set the power of beam 1 to 2.5 nW / cm 2 , the scanning speed is 0.8 m / s, the printing power of beam 2 is 28 nW / cm 2 , the scanning speed is 0.1 m / s, the scraping speed of the doctor blade is 0.02 m / s, and the single-layer printing thickness is 100 μm. Layer-by-layer solidification molding of the slurry is carried out by the 3D printing equipment to obtain an integral formed green mold of the core-shell with different performances; (Preferably, the slurry is placed in the slurry storage-doctor blade auxiliary system 8, and the slurry storage-doctor blade auxiliary system 8 is preferably a U-shaped double knife groove)

[0080] (4) Debind and sinter the integral formed green mold of the core-shell obtained in step (3) to obtain an integral formed mold of the core-shell.

[0081] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A light-curing 3D printing device for integrally forming a core and a shell, characterized in that: Comprising: A forming table (2), a printing tank (3), and a photocuring unit (100). The slurry can be disposed on the printing tank (3). The forming table (2) can move towards the printing tank (3) to form the slurry. During the forming process, the photocuring unit (100) can scan the slurry on the printing tank (3). The printing tank (3) includes a first region and a second region. There are two photocuring units (100), including a first photocuring unit (101) and a second photocuring unit (102). The first photocuring unit (101) is opposite to the first region to scan the slurry on the first region, and the second photocuring unit (102) is opposite to the second region to scan the slurry on the second region. At least one of different laser powers, different scanning paths, and different scanning speeds can be provided between the first photocuring unit (101) and the second photocuring unit (102). The slurry is a ceramic material. The ceramic material on the first region can be jointly acted on by the first photocuring unit (101) and the forming table (2) to form a ceramic core, and the ceramic material on the second region can be jointly acted on by the second photocuring unit (102) and the forming table (2) to form a ceramic shell. The photocuring unit (100) includes a reflecting galvanometer (5) and a laser (6). The laser can emit light to the reflecting galvanometer (5). The reflecting galvanometer (5) can receive the light emitted by the laser and reflect the light onto the slurry in the printing tank (3) to form a curing light path for curing and forming the slurry.

2. The photocuring 3D printing core and shell integrated forming device according to claim 1, characterized in that: The photocuring unit (100) is an ultraviolet photocuring unit, and the laser (6) is an ultraviolet laser. The ultraviolet laser can emit ultraviolet light to the reflecting galvanometer (5). The reflecting galvanometer (5) can receive the ultraviolet light emitted by the ultraviolet laser and reflect the ultraviolet light onto the slurry in the printing tank (3).

3. The photocuring 3D printing core and shell integrated forming device according to claim 1, characterized in that: The forming table (2) is located above the printing tank (3) and can move downward to act on the slurry on the printing tank (3) to form the slurry. The photocuring unit (100) is located below the printing tank (3) and can emit light upward to act on the slurry on the printing tank (3).

4. The photocuring 3D printing core and shell integrated forming device according to claim 3, characterized in that: It further includes a printing support table (4). The printing support table (4) supports the lower end and / or the side end of the printing tank (3). And the printing tank (3) includes a frame structure. There is a through groove structure in the middle of the frame structure. The area of the through groove structure can be scraped with slurry, and the through groove structure can receive the scanning light emitted by the photocuring unit (100) below.

5. The light-curing 3D printing core and shell integrated forming device according to claim 4, wherein: It further includes a slurry storage and scraping assistance system (8), and the slurry storage and scraping assistance system (8) is arranged in the through groove structure of the printing tank (3) to be able to scrape the slurry in the through groove structure and also store the slurry.

6. The light-curing 3D printing core and shell integrated forming device according to claim 5, wherein: It further includes a formed body separation system (9), and the formed body separation system (9) is arranged in the through groove structure and above the slurry storage and scraping assistance system (8) to be able to separate the forming table (2) from the slurry.

7. The light-curing 3D printing core and shell integrated forming device according to claim 5, wherein: It further includes a machine frame (1), an integrated control module (7) and a printing layer thickness control system (10). The light-curing unit (100), the printing support table (4), the printing layer thickness control system (10) and the integrated control module (7) are all arranged on the machine frame (1). The forming table (2) is connected to the printing layer thickness control system (10), and the printing layer thickness control system (10) can control the up and down movement distance and speed of the forming table (2). The integrated control module (7) is electrically connected to the printing layer thickness control system (10), the light-curing unit (100) and the slurry storage and scraping assistance system (8) respectively.

8. A preparation method of a multi-performance material photocuring 3D printing product, characterized in that: Including: A stirring and drying step of mixing and stirring the material powder and then obtaining a mixed powder body through drying; A slurry preparation step of adding the above-mentioned mixed powder body to a light-curing resin, heating to a preset temperature and then keeping warm and stirring for a preset time to obtain a light-curing 3D printing slurry; A 3D printing integrated forming step of using the light-curing 3D printing core and shell integrated forming device according to any one of claims 1-7 to print the light-curing 3D printing slurry to obtain a 3D printing integrated green body; A debinding and sintering step of subjecting the 3D printing integrated green body to debinding and sintering to obtain a light-curing 3D printing integrated component.

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