158 results about "Stereolithography" patented technology

The invention provides a water-soluble core mold material based on direct-writing forming photocuring 3D printing and a preparation method of the water-soluble core mold material. The preparation method comprises the following steps: mixing polyvinylpyrrolidone and absolute ethyl alcohol to prepare a water-soluble adhesive; fully mixing a photocuring monomer hydroxyethyl methylacrylate with a photoinitiator TPO (Thermoplastic Polyolefin) to prepare water-soluble photocuring resin; mixing the two materials, stirring with a high-speed stirrer, sequentially adding heavy calcium carbonate powder, glass beads, white carbon black and glass fiber powder in the stirring process, and fully stirring to obtain slurry; and the slurry is printed through a printer, a core mold primary blank is obtained, and the final core mold material is obtained through secondary curing. According to the water-soluble core mold material based on direct-writing forming photocuring 3D printing and the preparation method of the water-soluble core mold material, the technical problems that a traditional metal mold is difficult to design, high in manufacturing cost and low in demolding efficiency are solved, and the water-soluble core mold material which is good in rheological property, low in cost and easy to demold can be prepared.

The invention provides a method for manufacturing a terbium-dysprosium-iron giant magnetostrictive alloy based on three-dimensional photocuring molding, which comprises the following steps of: firstly, preparing three-dimensional photocuring molding slurry, adopting photosensitive resin as a matrix, and matching with a metal organic chelating agent containing terbium-dysprosium-iron giant magnetostrictive alloy component to enhance the uniform distribution of metal powder so as to ensure the printing precision and the material stability; secondly, the resin and the chelating agent are removed through heat treatment degreasing, the degreasing process is controlled by controlling the heating rate, and structural collapse is avoided; decarburization is carried out in a low-oxygen atmosphere, so that the purity of the alloy is improved, and the structural integrity before sintering is ensured; then reduction treatment is performed to improve the structural stability and purity; and finally, high-temperature sintering is carried out under the assistance of a magnetic field, grain orientation and magnetic domain arrangement are optimized, and the magnetostrictive effect and the force-magnetic energy conversion efficiency are improved. According to the method, three-dimensional light curing forming and magnetic field auxiliary heat treatment are combined, and the risk of structural damage in the printing process of the terbium dysprosium iron giant magnetostrictive alloy is practically and effectively avoided.

The present disclosure provides systems and methods for printing three-dimensional (3D) objects. A system for printing a 3D object may comprise at least one platform configured to hold a film of at least one mixture, a deposition unit for providing the film of the at least one mixture, and a building unit for forming at least a portion of the 3D object from the film of the at least one mixture. The system may further comprise a controller operatively coupled to the at least one platform. The controller may be configured to direct the at least one platform to move from the deposition unit to the building unit, or vice versa, along a plurality of non-overlapping paths.

The invention provides an optical system and photocuring 3D printing equipment, and belongs to the technical field of printing equipment. The optical system comprises a plurality of light-emitting assemblies used for emitting light. A plurality of collimation assemblies, wherein one collimation assembly is arranged corresponding to each light emitting assembly; light of each light-emitting assembly penetrates through the collimation assembly and irradiates on a target plane to form an illumination area; the controller is electrically connected with each light-emitting component and is used for independently controlling each light-emitting component; the lighting areas of every two adjacent light-emitting assemblies are at least partially overlapped to form an overlapped area, and the light intensity of the overlapped area is 80%-120% of the light intensity of a non-overlapped area in the lighting areas. Wherein the plurality of light-emitting assemblies are independently controlled by the controller, and compared with a traditional full-on and full-off light source setting mode, light interference can be reduced, and the contrast ratio can be improved; the controller controls the opening number of the peripheral light-emitting assemblies, so that the light intensity of the overlapping area is 80%-120% of the light intensity of the non-overlapping area, the possibility that dark spots or bright spots appear in the overlapping area is reduced, and the good light uniformizing effect is achieved.

The invention discloses a 3D printing photocuring forming method for a silicon nitride ceramic framework, and belongs to the technical field of advanced ceramic additive manufacturing. According to the 3D printing photocuring forming method for the silicon nitride ceramic framework, the silicon nitride framework containing a communicating hole array and a special-shaped supporting structure can be prepared through the DLP photocuring technology and customized slurry, the efficient infiltration requirement of a multiphase ceramic matrix is met, and the manufacturing efficiency is improved. The powder dispersity is improved through modification of a silane coupling agent, resin residues are thoroughly removed through cooperative control of a low-shrinkage resin system, segmented exposure, gradient degreasing and sintering, interface reaction with a complex-phase matrix at high temperature is avoided, stable complex-phase performance is guaranteed, layering does not exist after standing is conducted for 24 h through customized slurry, the process stability is extremely high, and the method is suitable for industrial production. Therefore, the problems of single skeleton structure, low dimensional precision and high impurity content in the prior art are solved, a complex three-dimensional pore structure can be prepared, the process stability is high, and the method is suitable for batch production and meets the requirements of multiple scenes such as high-temperature structural parts and multiphase ceramic reinforcement bodies.

The present disclosure relates to a system for performing scanning projection stereolithography. The system uses a light projector which is configured to generate a polymerizing optical signal to initiate polymerization of a photopolymerizable resin or material at a build plane. An optics subsystem collimates and focuses the polymerizing optical signal. The optics subsystem is movable relative to the build plane to optimize focus of the polymerizing optical signal at the build plane. A light scanning subsystem directs the polymerizing optical signal received from the optics subsystem to selected X axis and Y axis locations on the build plane. A positioning subsystem positions the optics subsystem at a selected location relative to the build plane, where the selected location is chosen to optimize focusing of the polymerizing optical signal at a specific, selected X / Y location on the build plane.

To provide a method for manufacturing high-precision three-dimensional objects in a short time.SOLUTION: A method for manufacturing a three-dimensional object by curing a stereolithography material 9 using a light irradiation device 1 includes: a material forming step of forming a layer of the stereolithography material 9, comprising a light-curable resin and solid filler, on the surface of a build table 4; and an exposure step of irradiating a portion to be cured within the stereolithography material 9 formed at the material forming step with light, the portion to be cured including a contour portion and a non-contour portion other than the contour portion. The exposure step provides a greater light energy per unit area to the contour portion than to the non-contour portion.SELECTED DRAWING: Figure 1

1. The name of the design product: Laser Stereo Forming Equipment (BLT-C600-2025 version). 2. The use of the design product: used for laser additive forming manufacturing, belongs to the field of additive manufacturing equipment. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1. 5. The bottom of the design product is not easy to see or not visible during use, omit the top view.

Embodiments of the present application provide a printing head and a three-dimensional printing device using the same. The printing head comprises a multi-nozzle printing unit and a multi-material extruding unit. The multi-nozzle printing unit comprises a nozzle driving assembly and a plurality of nozzle assemblies. The plurality of nozzle assemblies are configured to fit a plurality of materials respectively. The nozzle driving assembly is configured to rotate and selectively abut one of the plurality of nozzle assemblies to push the one nozzle assembly out of the other nozzle assemblies. The multi-material extruding unit comprises a plurality of extruding mechanisms. The plurality of extruding mechanisms are configured to fit the plurality of materials respectively. Each of the plurality of extruding mechanisms corresponds to one of the plurality of nozzle assemblies in a material transmission direction. The plurality of extruding mechanisms are configured to push at least one of the plurality of materials to the one nozzle assembly that is pushed out of the other nozzle assemblies. The three-dimensional printing device further comprises a three-dimensional printing body. The printing head is connected to the three-dimensional printing body and is adjustable relative to the three-dimensional printing body.

In a stereolithography apparatus a material supply device for a printing material (16), in particular a photosensitive polymer, to be hardened is provided. The material supply device (10) accommodates a material cartridge (12) which in turn accommodates and completely surrounds the printing material (16). The material cartridge (12) can be connected liquid-tightly with an outlet valve unit (20) through which the printing material (16) can be discharged and which is at least partially accommodated in the material supply device (10) and is at least partially supported on or in the material supply device or is sealed with respect to the material supply device. The outlet valve unit (20) has a valve (100) which is opened and closed depending on the relative position, in particular the swivel position, of the material supply device (10) and the stereolithography apparatus.

The invention discloses an integrated electrospray thruster transmitting module based on a 3D printing technology, and belongs to the technical field of spaceflight. The integrated electrospray thruster transmitting module is an integrated component which is integrally formed through a micro three-dimensional photoetching 3D printing technology, and a continuous fluid transmission channel from a liquid supply connector at the bottom end to a transmitting nozzle at the top end is arranged in the integrated electrospray thruster transmitting module; in the fluid flowing direction, the integrated electrospray thruster transmitting module sequentially comprises a liquid supply interface layer, a multi-layer flow channel structure and a transmitting layer from bottom to top. Integrated forming and high integration of the complex micro-channel structure are achieved, the array liquid supply uniformity is improved through the forked micro-channel structure, the size of sprayed liquid drops and the single-hole flow are reduced, and therefore emitter miniaturization is achieved, and the overall emission performance and working stability of the electrospray thruster are improved.

A hydrogen evolution electrode preparation method based on a three-period minimal curved surface structure belongs to the technical field of new energy electrolytic hydrogen production and fluid transportation, and comprises the following steps: constructing a three-dimensional model of the required three-period minimal curved surface structure; performing image slicing processing on the three-dimensional model by using slicing software; printing a required three-period minimal curved surface structure by using a plane projection micro-stereolithography 3D printer; a nanometer ultraviolet lamp is adopted to circularly irradiate the three-period extremely-small curved surface structure; soaking in a sulfuric acid solution and carrying out ultrasonic oscillation; carrying out vacuum drying and carrying out oxygen plasma hydrophilic treatment; depositing a nickel-based compact conductive layer on the three-period minimal curved surface structure by using chemical deposition; depositing a nickel-iron alloy catalyst on the three-period minimal curved surface structure of the nickel substrate by using electro-deposition; and carrying out ultrasonic oscillation with ethanol and vacuum drying. According to the application, collaborative design of catalyst distribution and a macro-microstructure is realized, and a new way is provided for preparation of a high-performance water electrolysis hydrogen production electrode.

A stereolithography machine (1) comprising: a tank (4); a source (5) of electromagnetic radiation adapted to selectively irradiate the tank (4); a modelling platform (6), which is carried in a mobile manner along a first reference axis (A) orthogonal to the bottom (8) of the tank (4); a multifunction assembly (23) provided at least with levelling means (22), which are adapted to level the fluid substance in said tank (4), equipped with an oblong paddle (27), which extends along a second reference axis (B) orthogonal to the first reference axis (A) and is carried in a movable manner along a direction (di) orthogonal to the first reference axis (A) and the second reference axis (B), and wherein the paddle (27) is pivotally carried about a rotation axis (C) parallel to the second reference axis (B).

Photosensitive printing inks, methods of 3D printing those inks, and 3D-printed structures are provided. The printing inks comprise a polymer scaffold, a phase-separating monomer, a photoinitiator, and preferably a photoabsorber dispersed or dissolved in a solvent system. The polymer scaffold comprises a polymer functionalized with at least two chain transfer or RAFT agents. The polymer scaffold and solvent system are selected so that the polymer scaffold is soluble in that solvent system. Additionally, the phase-separating monomer and solvent system are selected so that the phase- separating monomer is insoluble in the solvent system and so that phase-separating monomer will undergo photoinitiated chain extension to form polymer chains that are soluble in the solvent system. The provided inks can be efficiently printed to form structures that lack (or substantially lack) chemical crosslinks, thus relying on physical crosslinking to maintain shape. The resulting structures have shorter and / or controlled dissolution rates, making them useful for biomedical and other applications.

The invention discloses a photocurable polyimide ionomer composition and a preparation method and application thereof, and the photocurable polyimide ionomer composition comprises the following components in parts by weight: 30 parts of polyimide oligomer; 5 to 100 parts of a reactive diluent; 2 to 5 parts of a photoinitiator; and 0.2 to 1.5 parts of alkali. The invention provides a photocurable polyimide ionomer composition as well as a preparation method and application thereof, and solves the problem of high shrinkage rate of a workpiece caused by high-temperature imidization and solvent volatilization of an existing photocurable polyimide system. And the heat resistance, the mechanical property and the printing manufacturability are difficult to consider due to poor compatibility of polyimide and a photocuring component. The polyimide ionomer composition is suitable for photocuring additive manufacturing processes such as stereolithography.

The invention belongs to the technical field of 3D printing, and provides a photocuring 3D printer and an optical system and an operation method thereof, the optical system comprises a plurality of light-emitting assemblies, and each light-emitting assembly comprises one or more LEDs emitting ultraviolet light; the controller comprises a plurality of channels, each channel is used for providing a path of driving current, and the controller is configured to independently control each light-emitting assembly; an LED of the light-emitting assembly is configured to be electrically connected with at least two channels and connected with a first driving voltage. The current amplification circuit is electrically connected with the channel of the controller and is connected with a second driving voltage; or a plurality of cut sub-LED wafers are included, and the plurality of sub-LED wafers are connected in series and are electrically connected with the channel of the controller, and third driving voltage is accessed to the sub-LED wafers. According to the embodiment of the invention, the independent control of a single LED can be realized, and the controllability and flexibility of a light source are improved.

The present invention relates to relates to a polymer formulation for three-dimensionally (3D) printing an article by stereolithography, the formulation comprising a functionalized polymer. The invention further relates to lithographic methods to form 3D objects that incorporate the aforementioned polymer formulation.

The present invention discloses a method for adjusting the inkjet uniformity of light-curing 3D printing using a cylinder, which relates to the technical field of inkjet uniformity adjustment. The method includes calculating the curvature according to the geometric characteristics of the cylinder, calculating the vertices and inflection points of the cylinder according to the curvature, calculating the vertices and inflection points that the nozzle needs to pass through according to the non-planar path planning algorithm, generating the movement trajectory of the UV-curing inkjet printer nozzle, setting the inkjet parameters according to the curing rate, adjusting the nozzle movement speed based on the cylinder curvature, applying inkjet timing compensation in the edge area of the cylinder to offset the centrifugal offset, performing inkjet on the cylinder based on the nozzle movement trajectory, nozzle movement speed and inkjet parameters, and identifying the uneven inkjet area using the K-means clustering algorithm. The present invention solves the technical problem of uneven inkjet encountered in the 3D printing process through the non-planar path planning algorithm, and improves the quality and production efficiency of the final product.

The present invention proposes a method for manufacturing a TbDFe supermagnetic alloy based on stereolithography. The method first prepares a stereolithography slurry using a photosensitive resin as a matrix. A metal-organic chelating agent containing TbDFe supermagnetic alloy components is added to enhance the uniform distribution of the metal powder, ensuring printing accuracy and material stability. Next, degreasing is performed to remove the resin and chelating agent through heat treatment. The degreasing process is controlled by controlling the heating rate to avoid structural collapse. Decarburization is then performed in a low-oxygen atmosphere to improve the purity of the alloy and ensure structural integrity before sintering. A reduction treatment is then performed to improve structural stability and purity. Finally, high-temperature sintering is performed under the assistance of a magnetic field to optimize grain orientation and magnetic domain arrangement, thereby enhancing the magnetostrictive effect and force-to-magnetic energy conversion efficiency. This method combines stereolithography with magnetic field-assisted heat treatment, effectively avoiding the risk of structural damage during the printing of TbDFe supermagnetic alloy.

The present invention discloses a real-time processing method for dynamic backlight distribution of an LCD light-curing 3D printer. The sliced image data of the model to be printed is obtained. For each sliced image of each layer, the change situation in the sliced image sequence where it is located is calculated, that is, the overlapping area with the sliced images of the upper layer and the lower layer. When the ratio of the overlapping area with the upper layer to the area of the current layer is greater than a first preset value, the calculation of the two-dimensional irradiation distribution of the sliced image of this layer is skipped to affect the dimming of each LED; when the ratio of the overlapping area with the lower layer to the area of the current layer is less than a second preset value and greater than a third preset value, the change amount of the sliced image of the lower layer is calculated within the processing cycle of the current sliced image, and the actual power of the corresponding LED dimming block in the area where the increased or decreased area is located is calculated according to the change amount; for each sliced image, the irradiance of the LCD light-incident surface when the power of the corresponding LED dimming block changes incrementally or completely is calculated in real time.

To appropriately perform modeling of a colored modeling object by using an optical modeling method.SOLUTION: A modeling apparatus 10 for performing modeling by a photolithography method, comprises: a tank 12, which is a modeling material storage tank that stores a photocurable modeling material; a table 14 that supports an upper surface of a modeling object being modeled; a table drive unit 22 that moves the table 14; a light irradiation unit 16 that irradiates the table 14 with light from above to cure the modeling material; and an inkjet head 102, which is a head for a coloring material that ejects an ink which is the coloring material. The inkjet head 102 ejects the ink onto the modeling object being modeled, thereby coloring the modeling object.SELECTED DRAWING: Figure 1

Provided is an ultraviolet-curable silicone composition for stereolithography comprising: (A) organopolysiloxane having two groups indicated by formula (1) in a molecule (in the formula, R1 represents a monovalent hydrocarbon group, R2 represents an oxygen atom or an alkylene group, and R3 represents an acryloyloxyalkyl group, a methacryloyloxyalkyl group, an acryloyloxyalkyloxy group, a methacryloyloxyalkyloxy group, a (acryloyloxyalkyl) dimethylsilyloxy group, or a (methacryloyloxyalkyl) dimethylsilyloxy group, where p represents a number satisfying 0 ≤ p ≤ 10, and a represents a number satisfying 1 ≤ a ≤ 3); (B) hydrophobic silica particles having an average particle diameter of 10-1,000 nm and a degree of hydrophobicity of 60% or more by a methanol titration method; and (C) a photopolymerization initiator.

A composition which can be photopolymerized to make a part consisting of an oxide ceramic, or a hybrid part comprising at least one oxide ceramic and organic constituents, by a stereolithographic technique, the composition comprising: at least one photopolymerizable organic compound; at least one photo-initiator; at least one precursor of the oxide ceramic wherein the composition comprises from 25% to 70% by mass, relative to the total mass of the composition, of the at least one precursor of the oxide ceramic; and wherein the at least one precursor of the oxide ceramic comprises a mixture comprising a nanometric powder of the oxide ceramic, and at least one other element selected from a micrometric powder of the oxide ceramic and a pre-ceramic compound of the oxide ceramic.

Disclosed herein are the synthesis and characterisations of the monoacrylate-functionalised phthalonitriles (PNs). Their chemical structures are verified with 1H nuclear magnetic resonance (NMR) and Fourier transform infrared (FT-IR) spectra to confirm the successful synthesis. Subsequently, photopolymerisable resins, based on the prepared PN monomer, a commercial diacrylate and other additives can be formulated. Being post thermally treated, the PN based resins result in polymeric products with excellent thermal and mechanical performances, suggesting the high-performance nature of the PN based resins. Interestingly, the resins exhibit significant high carbon yield, indicating that they are greatly promising candidates as carbon precursors. As it is found that the resins have good three-dimensional (3D) printing capability and can be fabricated using high-resolution projection micro-stereolithography (PμSL) additive manufacturing technology, complex 3D structured objects are herein printed and performed follow-up post treatment. After being progressively pyrolysed up to 1000° C., the printed objects can be readily converted to glassy carbon (GC) structures with structural integrity and fidelity. Only ˜25% of shrinkage was found for the converted GC structure due to the significantly high char yield of the PN resins. This work not only expands the library of new class of high-performance PN resins for popular additive manufacturing but also features the precision 3D printing of GC with low shrinkage and high carbon yield for the first time.

The invention relates to the technical field of optical detection and optical fiber sensing, in particular to a Fabry-Perot temperature-depth sensor based on an optical fiber ring laser and a measuring system. The sensor adopts an all-fiber intracavity sensing design, and comprises a composite sensing probe formed by cascading a Fabry-Perot interferometer and a fiber bragg grating, a fiber ring laser cavity and a demodulation unit. The sensor probe is integrally packaged by adopting a three-dimensional photoetching 3D printing technology, the structure is firm, and the size is compact. According to the system, a sensing probe is embedded into a laser cavity, weak signals are amplified by utilizing gain in the cavity, and response signals of an FPI and an FBG are processed in real time based on a multi-parameter matrix algorithm in combination with stable wavelength reference and temperature reference provided by the FBG, so that high-precision synchronous measurement of temperature and hydraulic pressure (depth) and effective decoupling of cross sensitivity are realized. The optical fiber temperature-depth sensor overcomes the problems that a traditional optical fiber temperature-depth sensor is serious in cross sensitivity and poor in environmental adaptability in a complex underwater environment, has the advantages of being high in sensitivity, good in stability, high in anti-interference capacity, convenient to integrate and the like, and is suitable for the fields of ocean observation, deep sea exploration, underwater engineering safety monitoring and the like.

A method for preparing a three-dimensional electrolytic hydrogen production functional electrode based on wettability gradient and unidirectional manipulation of bubbles, which belongs to the field of new energy electrolytic hydrogen production and fluid transport technology. The present invention prints the electrode substrate and the gas manipulation grid based on surface projection micro-stereolithography printing technology, and uses nano-silicon dioxide to perform asymmetric wettability treatment on the gas manipulation grid on the top of the electrode, and uses its super-aerophilic properties to perform unidirectional manipulation of the bubbles; and uses chemical deposition to deposit a cobalt-nickel-phosphorus alloy catalyst on the bottom three-dimensional electrode surface, thereby achieving the functions of efficient hydrogen production by electrolysis of water and separation of hydrogen products. This three-dimensional hydrogen production functional electrode and its preparation method are simple to operate and have excellent hydrogen production performance. The three-dimensional electrolytic hydrogen production functional electrode based on wettability gradient and unidirectional manipulation of bubbles prepared by the present invention has the characteristics of large-area stacking and splicing, which can enhance space utilization while accelerating electrolysis efficiency.

In this invention, fluidity suitable for producing a dental member by vat photopolymerization is provided, and adhesion between the dental member and a liner material or another member corresponding to the liner material is excellent even after the dental member is used in an oral cavity for a long period of time. This curable composition for three-dimensional stereolithography comprises: (A) 100 parts by mass of a (meth)acrylate-based polymerizable monomer component that contains a polyfunctional (meth)acrylate-based polymerizable monomer and contains no methyl (meth)acrylate; (B) 0.7-220 parts by mass of a monofunctional (meth)acrylate polymer that has a number average molecular weight of 1,000-50,000 as measured by gel permeation chromatography; and (C) a photopolymerization initiator.