190 results about "Stereolithography" patented technology

Provided are photocurable resins comprising a poly(siloxane)-based copolymer together with a photoinitiator, and other optional ingredients such as a photocurable diluent, a photoabsorber, a photosensitizer, or a hydrophillic additive. Also provided are methods of stereolithographically printing a 3-D object from a disclosed resin. Also provided is an improved method for stereolithographically printing a 3-D object, the improvement comprising the use of a disclosed photocurable resin. Further provided is a 3-D microfluidic device such as an artificial lung prepared from a disclosed photocurable resin.

The invention discloses a carbon-based metamaterial electromagnetic wave absorber and a preparation method and application thereof. The wave absorbing body adopts a three-layer composite structure, wherein the bottom layer is a copper plate reflecting layer; the lower layer is of a honeycomb-like structure and is formed by periodically arranging regular octagons and square hollow quadrangular prisms externally connected with the regular octagons, and the adjustable wave absorbing frequency band is achieved by adjusting and controlling the width and height of the hollow cores; the upper layer is of a pointed cone structure, and the impedance matching characteristic is enhanced by optimizing the vertex angle of the regular rectangular pyramid. The wave absorber is made of photosensitive resin, based on the photocuring 3D printing technology, honeycomb-like and pointed cone structures are printed step by step and bonded and combined, and high-precision forming is achieved in combination with parameterized regulation and control. The wave absorber has the advantages of light weight, broadband absorption and adjustable mechanical performance, can be applied to the fields of EMI shielding of electronic equipment, military radar stealth, high-frequency communication protection, electromagnetic environment protection and the like, and remarkably improves the electromagnetic wave absorption and shielding effectiveness through the metamaterial structure design and a multi-component cooperative loss mechanism.

The invention relates to an aminoguanidine oxalate second-order nonlinear optical crystal material and preparation and application thereof, the chemical formula of the crystal material is (CN4H7) + (C2O4H)-, the crystal material belongs to a monoclinic system, the space group is P21, the cell parameters are # imgabs0 # and # imgabs1 #, alpha is equal to 90 degrees, beta is equal to 95-100 degrees, gamma is equal to 90 degrees, and Z is equal to 2. The powder frequency-doubled effect of the nonlinear optical crystal (CN4H7) + (C2O4H)-disclosed by the invention under the irradiation of 1064nm laser is about 1.0 time of that of a KH2PO4 (KDP) crystal, and phase matching can be realized. In addition, the crystal material has the advantages of being short in ultraviolet absorption cut-off edge (290 nm), easy to grow and the like, and has important application value in the photoelectric conversion fields of stereolithography, solid-state lasers, optical communication, optical parametric amplifiers, optical parametric oscillators, laser frequency converters and the like.

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 invention discloses a surface acoustic wave holographic metamaterial and a design method thereof. According to the surface acoustic wave holographic metamaterial design method based on the direct search method, stepped design of the resin plate is achieved based on the photocuring 3D printing technology, the phase is changed by changing the propagation distance of sound waves in different materials, and patterned focusing of a target plane is well achieved; the reverse design of the metasurface unit is carried out by adopting a direct search method, on-demand customization can be realized, the regulation and control mode of the designed acoustic metasurface is flexible, and a new scheme is provided for the design of the acoustic metasurface under the conditions of high frequency and excitation sound field non-plane waves; the reverse independent design method provided by the invention can promote the practical application of the holographic metasurface under the conditions of high frequency and excitation sound field non-plane waves, and has important application value in the engineering fields of acoustic particle manipulation, biological cell manipulation and the like.

The invention discloses a photocuring 3D printing ink-jet uniformity adjusting method using a cylinder, and relates to the technical field of ink-jet uniformity adjusting, and the method comprises the steps: calculating the curvature according to the geometrical characteristics of the cylinder, calculating the vertex and inflection point of the cylinder according to the curvature, calculating the vertex and inflection point through which a nozzle needs to pass according to a non-planar path planning algorithm, and adjusting the uniformity of the photocuring 3D printing ink-jet uniformity. The method comprises the following steps: generating a UV curing ink printer nozzle motion trail, setting ink jet parameters according to a curing rate, adjusting the nozzle motion speed based on a cylinder curvature, applying an ink jet time sequence to a cylinder edge area to compensate and offset centrifugal offset, and carrying out ink jet on a cylinder based on the nozzle motion trail, the nozzle motion speed and the ink jet parameters. And a K-means clustering algorithm is used to identify a non-uniform ink jet area. According to the method, the technical problem of non-uniform ink jetting in the 3D printing process is solved through a non-planar path planning algorithm, and the quality and production efficiency of a final product are improved.

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.

The present invention provides a high-speed photocuring 3D printing simulation method based on fluid-structure interaction, which comprises the following steps: S1: Establish a model of the photocuring 3D printing process, and the model includes: photocuring reaction, mass transfer process of reactants, light intensity distribution, phase distribution, resin flow and phase change process, and elastic deformation of the resin tank bottom; S2: Construct a geometric model of the resin tank, and determine the initial conditions and boundary conditions of the geometric model; S3: Perform mesh division on the geometric model of the resin tank; S4: Determine the simulation parameters during the simulation process; S5: Select different strategies according to the printing mode for numerical solution. The above numerical simulation method for photocuring 3D printing can use the same set of models to simulate and analyze the two printing modes of continuous printing and layer-by-layer printing, and can be used to deeply analyze the photocuring forming mechanism under the coupling action of multiple physical fields, improve the process through virtual printing, optimize process parameters, and thus improve the printing speed and the forming quality of parts.

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.

In some embodiments, devices for use as blood-brain barrier models are disclosed. The devices may include either a hydrogel component that surrounds a channel formed between a first opening and a second opening of the hydrogel component, or a hydrogel component that forms a groove. The devices may further include pericytes disposed in the channel or the groove, and endothelial cells may be disposed in the channel or the groove. The hydrogel component may include astrocytes (e.g., printed into the hydrogel component via projection stereolithography). Also disclosed are various methods of making and using these devices.

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.

The present invention discloses a method for constructing a three-dimensional model of apparent cracks in images, which relates to the field of inspection and maintenance of buildings and structures. After obtaining the apparent crack images of buildings and structures, an image processing method is used to obtain a crack-matrix binary image. The width and mean value of each crack are measured, and a curved function is selected to make a depression mapping hypothesis for the crack. Corresponding spatial scatter points are established for each crack pixel, and a triangulation is established among the scatter points. The scatter points and the connected triangular patches are refined, and then a new triangulation is established. Finally, a three-dimensional model is established using stereolithography technology and exported. The present invention works based on two-dimensional images of conventional optical cameras, without the need to purchase three-dimensional imaging equipment, and has the advantages of being simple and easy to implement, small volume of the generated result file, short calculation time, being conducive to popularization, and the obtained fine three-dimensional model being close to the reality. The generated fine three-dimensional model can be used for comparison and judgment of apparent cracks in buildings and structures and size measurement, or imported into numerical simulation software for simulation analysis.

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 relates to the technical field of 3D printing, in particular to a photocuring 3D printer which comprises a base, a lifting frame is fixedly mounted on the rear side of the top end of the base, and two fixing frames are fixedly mounted on one side of the base; resin liquid in the printing material groove is discharged into the liquid collecting box through the liquid discharging pipe, and then the side, provided with the liquid discharging hole, of the printing material groove is clamped into the inclined mounting frame, so that the liquid discharging hole is aligned to the position of the liquid leaking hole; at the moment, resin, attached to the surface of the inner wall, in the printing material groove flows into a liquid discharging hole under the action of gravity and is discharged into a liquid collecting box through a liquid leaking hole, and the situation that resin liquid is attached to the inner wall of the printing material groove and is difficult to clean is avoided; the problems that when the photocuring 3D printer is used, the resin liquid recovery efficiency is low due to the fact that the resin liquid is difficult to remove from a material groove, and when the resin liquid is cleaned, a release film is prone to being damaged, and the quality of finished products printed subsequently is affected are solved.

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.

An apparatus, including: a print head (124) including: an attachment (126) that is configured to be attached to a movable carriage of a stereolithography 3D printer (SLA printer); and when the print head is installed on the movable carriage: a build platform (202) having a bottom surface (146) that faces downward, a front surface (162) that faces a front of the SLA printer, a rear surface (166) that faces a rear of the SLA printer, and side surfaces (174, 176) connecting the front surface to the rear surface; and at least one magnet (152) secured to the print head.

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.