59 results about "Stereolithography" patented technology

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 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.

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 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.

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.

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.

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.

A method for producing a three-dimensional object on an additive fabrication device includes placing a first composite material patch on a bottom of a vessel of the additive fabrication device. The method also includes moving a build plate of the additive fabrication device whereby at least one of the build platform or a layer of at least partially cured resin on the build plate touches the first composite material patch. The method further includes irradiating resin contained inside the vessel with an energy source to at least partially cure a layer of resin integrated with the first composite material patch.

The invention provides three-dimensional printing equipment and a three-dimensional printing method.The three-dimensional printing equipment comprises a material disc assembly, a light source assembly, a platform assembly and a moving assembly, in the first direction, a material groove is formed in one end of the material disc assembly, and the material groove is used for containing printing supplies; the light source assembly is connected to the tray assembly, and the light emitting side of the light source assembly faces the trough; in the first direction, the platform assembly is arranged on one side of the material disc assembly, a forming face is arranged at the end, facing the material disc assembly, of the platform assembly, and the forming face is configured to allow printing supplies to form a printing piece on the forming face; the moving assembly comprises a transmission structure and a moving part, and the transmission structure is in transmission connection with the moving part and used for driving the moving part to move in the first direction; wherein the tray assembly is connected to the moving part, and the moving part is configured to drive the tray assembly to be close to or away from the platform assembly.

This invention belongs to the field of polymer materials and 3D printing technology, and particularly relates to a photocurable 3D printing bio-based resin, its preparation method, and its applications. By weight, the resin is mainly composed of 50-70 parts of a photosensitive resin prepolymer matrix, 30-50 parts of the reactive diluent hydroxyethyl methacrylate (HEMA), and 1-5 parts of a photoinitiator. The prepolymer matrix is ​​prepared by ring-opening esterification of malic acid and citric acid with glycidyl methacrylate (GMA) through a specific step-temperature controlled process, followed by the compounding of precisely synthesized photosensitive malic acid monomer (MG) and photosensitive citric acid crosslinking agent (CG). This invention utilizes HEMA to effectively break the large molecular hydrogen bond network between prepolymers, achieving an effective reduction in resin viscosity while maintaining a high bio-based content. The resin of this invention exhibits low viscosity, rapid photoresponse, high double bond conversion rate, and excellent curing heat stability, making it highly suitable for stereolithography (SLA), digital light processing (DLP), and applications in electronic packaging and electromagnetic shielding.

The present disclosure provides systems and methods for printing three-dimensional (3D) objects. In some embodiments, the system comprises: a build head configured to support at least a portion of the 3D object during the printing; a platform comprising an area configured to hold a mixture adjacent to the build head; an optical source configured to provide light to the mixture, wherein the light is sufficient to cause formation of at least the portion of the 3D object; and an actuator operatively coupled to the optical source for controlling projection of the light onto the area, wherein the actuator is configured to: (i) adjust a movement between the optical source and the build head relative to one another, along a plurality of degrees of freedom; or (ii) adjust a movement between the optical source and the area relative to one another.

A three-dimensional object printing device that prints a three-dimensional work of various shapes in a wide range. The three-dimensional object printing device has a photographing device fixed to a base and photographing an object inside a photographing range, a first robot arm that supports a head having a nozzle that ejects a liquid and changes a position and an attitude of the head, and a second robot arm that supports a three-dimensional work and changes a position and an attitude of the work, and in the three-dimensional object printing device, a material supply step in which the second robot arm moves the work from outside to inside of the photographing range, and a printing step in which the head ejects the liquid to the work while at least one of the first robot arm and the second robot arm relatively moves the head and the work inside the photographing range are executed.

This invention discloses a photocuring process visualization ink composition, comprising a photocrosslinkable precursor component, a photoinitiator component, and a free radical indicator. During photocuring, the free radical indicator reacts with free radicals generated by the photoinitiator under photoexcitation, changing from one color state to another. The light absorption peak of the free radical indicator is spectrally separated from the excitation wavelength of the photoinitiator. This invention also discloses a method for visualizing the photocuring process using the above composition and an additive manufacturing process with visualization monitoring capabilities. The method described in this invention is compatible with most photocuring systems based on free radical polymerization mechanisms, and the monitoring process is applicable to various photo-based 3D printing technologies such as volumetric additive manufacturing, digital light processing, and stereolithography, providing a material and methodological basis for process visualization and closed-loop control in bio-3D printing.

Disclosed herein is an apparatus for making a stereolithographic object. Also disclosed herein are methods for making a stereolithographic object, a method for locating the position of debris, a method for characterizing the viscosity of the material, and a method for monitoring consumption of a material for making a stereolithographic object.

A three-dimensional object printing device that can print a wide range of shapes of a three-dimensional workpiece. The three-dimensional object printing device includes a first robot arm that supports a head having a nozzle that ejects a liquid and changes the position and attitude of the head, and a second robot arm that supports a three-dimensional workpiece and changes the position and attitude of the workpiece.

Provided is a stereolithographic resin composition that suppresses sedimentation of the filler during shaping, has good handleability, and has high thermal conductance of the cured product. A stereolithographic resin composition containing a photocurable resin and a filler, wherein the filler is a metal-coated particle having a base particle including a polymer material and having a metal layer coating the surface of the base particle, and a density of the metal-coated particle is 1.5 g / cm3 to 4.0 g / cm3.

The present invention provides a resin composition for stereolithography that excels in strength, toughness, and water resistance in the form of a shaped article. The present invention relates to a resin composition for stereolithography that comprises a urethanized (meth)acrylic compound (A), a (meth)acrylate compound (B) containing no urethane bond, and a photopolymerization initiator (C),the compound (A) being a urethanized (meth)acrylic compound (A-1) having a polymer structure, and / or a urethanized (meth)acrylic compound (A-2) having no polymer structure,the compound (A-1) having a weight-average molecular weight of less than 1,000,the compound (A-2) having a molecular weight of less than 1,000,the compound (B) comprising at least one selected from the group consisting of a (meth)acrylate compound (b-I) represented by general formula (I), and a (meth)acrylate compound (b-II) represented by general formula (II).

The application belongs to the technical field of laser stereolithography and relates to a non-powered single-knife bidirectional powder spreading device, which comprises a scraper holder, a powder temporary storage box, a powder pushing mechanism and a powder pushing driving mechanism; the powder pushing driving mechanism and the powder temporary storage box are arranged at the tail end of the scraper holder along the powder spreading operation direction; the powder pushing mechanism is arranged in the powder temporary storage box; the powder pushing driving mechanism is connected with the powder pushing mechanism; along the powder spreading direction, the scraper holder drives the powder pushing mechanism to move downward in the powder temporary storage box through the powder pushing driving mechanism; along the powder returning direction, the scraper holder drives the powder pushing mechanism to move upward in the powder temporary storage box through the powder pushing driving mechanism. The application provides the non-powered single-knife bidirectional powder spreading device which does not need to additionally increase a power source, reduces the equipment cost and can improve the equipment operation reliability.

1. Name of the product in this design: Three-dimensional force-shaping plate (hydrangea). 2. Purpose of this design: In outdoor sports, after setting up a rope system, the force on the rope is distributed. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

A three-dimensional object printing apparatus capable of reducing variation in ink ejection characteristics in an inkjet head. The three-dimensional object printing apparatus has: a base; an arm supported by the base; a liquid ejection head fixed at a top end of the arm and ejecting a liquid toward a workpiece; a liquid storage portion storing the liquid; a supply flow path communicating the liquid storage portion and the liquid ejection head and supplying the liquid from the liquid storage portion to the liquid ejection head; and a pressure adjustment valve provided midway in the supply flow path and adjusting the pressure of the liquid supplied to the liquid ejection head. The arm has N (N ≥ 3) movable portions that three-dimensionally change the position and posture of the liquid ejection head. The pressure adjustment valve is fixed to the arm.

This invention belongs to the field of liver cancer chips and drug evaluation, specifically disclosing a liver cancer chip based on a microporous array, its preparation method, and its applications. The liver cancer chip of this invention involves the overall design and modeling of a resin chip mold, including a concentration gradient generation module and a microporous array cell culture module. The resin mold is then printed using surface projection micro-stereolithography, and finally bonded using a template replication method and plasma treatment to obtain a complete liver cancer chip. The liver cancer chip prepared by this invention can be used for in vitro drug evaluation. Its concentration gradient generation module can stably generate multiple drug concentrations, while its downstream microporous array cell culture module can efficiently generate uniformly sized and highly active liver cancer cell spheroids, which is expected to be promoted and applied in personalized, high-throughput drug evaluation.

Provided are: a curable resin composition for photoshaping, which is capable of forming an optical three-dimensionally shaped object having both sufficient toughness and heat resistance; a cured product thereof; and a three-dimensionally shaped object. This curable resin composition for photoforming contains (A) a urethane resin having two (meth) acryloyl groups, (B) an alpha, beta-unsaturated carbonyl compound, and a photopolymerization initiator. The urethane resin (A) has, as reaction raw materials, a polycarbonate diol (a1), a diisocyanate (a2), and a compound (a3) having a hydroxyl group and a (meth) acryloyl group. The polycarbonate diol (a1) has a branched or linear aliphatic structure. The glass transition temperature (Tg) of the [alpha], [beta]-unsaturated carbonyl compound (B) as a monomer polymer is 50 DEG C or more. The urethane resin (A) has a number average molecular weight (Mn) of 2000 or more.

Method for 3D print manufacturing, where print platform attaches to carrier of separate 3D printer, cover closes, printing program starts following printing parameters, printing material corresponding to printing parameters automatically fills resin tank, printing process corresponding to printing parameters automatically starts, cover opens after printing finishes, platform is removed from carrier using manipulator and attached to carrier of separate washing machine, airtight cover closes, printing parameters collected from printer are transferred, washing program starts, washing tub automatically fills with washing medium corresponding to printing parameters, print is automatically washed, washing medium vapors evacuate after washing finishes, cover opens, platform is removed from carrier using manipulator and attached to carrier of separate curing machine, cover closes, printing parameters collected from washing machine are transferred, curing program starts, print is automatically dried and irradiated with UV light corresponding to printing parameters, cover opens after curing finishes, and platform is removed using manipulator.

The application discloses a kind of TiN / TC4 composite coating of microorganism corrosion resistance additive preparation method, comprising: one, Al-Cu-Mg alloy coating is prepared by spraying on the surface of pipeline steel;Two, TiN particles are prepared;Three, TC4 titanium alloy powder is mixed with TiN particles uniformly, and mixed powder is obtained;Four, laser stereolithography is used to prepare TiN / TC4 ceramic metal composite coating on Al-Cu-Mg alloy coating, and TiN / TC4 composite coating of microorganism corrosion resistance is obtained.The ceramic metal composite coating prepared by the application has excellent microorganism corrosion resistance, and is used in the microorganism corrosion working environment of long-distance pipeline steel.The coating material shows excellent microorganism corrosion resistance, can meet the requirements of long-distance pipeline steel working environment, effectively solves the problem of long-distance pipeline steel microorganism corrosion, and has good application prospect in long-distance pipeline protection field.

This disclosure relates to a method and system for segmenting faces of component in STL files. The method may include detecting by a controller an expanding and contiguous set of triangles based on an order of occurrence thereof in the STL file. Further, the method may include identifying by the controller a plurality of hard edges and a plurality of hard co-edges of each triangle from the expanding and contiguous set of triangles. Further, the method may include determining by the controller a closed loop formed by collating the plurality of hard edges and the plurality of hard co-edges. Further, the closed loop may form a boundary corresponding to a face. Further, the method may include segmenting by the controller at least one face by identifying at least one boundaries corresponding to the face based on the determining the closed loop.

A curable resin composition for stereolithography capable of forming an optical three-dimensional shaped object having both sufficient toughness and heat resistance, a cured product of the composition, and a three-dimensional shaped object are provided. The curable resin composition contains a urethane resin (A) having two (meth)acryloyl groups, an α,β-unsaturated carbonyl compound (B), and a photopolymerization initiator. The urethane resin (A) is obtained by using, as reaction raw materials a polycarbonate diol (a1), a diisocyanate (a2), and a compound (a3) having a hydroxyl group and a (meth)acryloyl group. The polycarbonate diol (a1) has a branched or linear aliphatic structure. The α,β-unsaturated carbonyl compound (B) has a glass transition temperature (Tg) of 50° C. or higher when formed into a polymer. The urethane resin (A) has a number average molecular weight (Mn) of 2000 or more.

The application provides a method for calculating axial photocuring complex oil pipeline sand mold stereoscopic forming, and the device comprises an outer frame, a storage box, an equal-curvature long columnar light-transmitting container, a cylinder lifting mechanism, a numerical control rotary table, a lifting fixing mechanism, a laser projection device, a calibration camera, a C-shaped hot air mechanism, a cooling loop pipeline and an oxygen content monitoring control mechanism and the like. The forming method is that the printing matrix is used to implement the calculation of the axial photocuring complex oil pipeline sand mold stereoscopic forming by using the forming device. In the printing forming environment, the printing matrix in the rotating equal-curvature long columnar light-transmitting container is subjected to multi-angle laser projection, the scattering phenomenon of the light in the non-100% transparent material is represented in real time by using a red LED lamp and a calibration camera, the laser intensity is calibrated, the forming step of layer-by-layer sand laying and then printing is omitted, the resin in the printing matrix is subjected to cross-linking reaction by photopolymerization induction, and the sand mold with small and slender complex oil pipelines is directly formed at one time.

This application relates to a printhead assembly and a 3D printer. The printhead assembly includes a heat dissipation unit and a heating unit spaced apart along a first direction; a heat insulation unit disposed between the heat dissipation unit and the heating unit; multiple nozzle units, each of which is sequentially disposed along the first direction through the heating unit, the heat insulation unit, and the heat dissipation unit, and is also spaced apart along a second direction perpendicular to the first direction; a nozzle unit receiving driving force can move along the first direction to a first position; and a switching unit connected to the heat dissipation unit. During the movement of one of the nozzle units along the first direction to the first position, the nozzle unit can push the switching unit to move in the second direction, so that the nozzle unit not receiving driving force and currently in the first position can move along the first direction to the second position. This application enables high-speed printing and waste-free printing, and effectively protects the model and the nozzle units.