134 results about "Selective laser sintering" patented technology

The invention provides an additive manufacturing method of a short fiber reinforced ceramic composite aircraft engine swirler, which comprises the following manufacturing steps: performing interface preparation on the fiber surface to obtain composite powder, and mixing the powder with silicon carbide powder and resin to obtain mixed powder; carrying out selective laser sintering printing molding on the mixed powder to obtain a ceramic green body, and carrying out degreasing treatment to obtain an intermediate; performing two-step impregnation and cracking on the intermediate through a ceramic precursor and resin to obtain a preform 2, performing gas / liquid phase reaction sintering treatment on the preform 2 to obtain Cf / SiC ceramic, depositing silicon carbide on Cf / SiC through a chemical vapor infiltration method, and performing abrasive flow grinding and polishing to obtain a finished product. The short fiber reinforced silicon carbide powder precise printing forming swirler is achieved, fiber, silicon carbide and resin powder are subjected to composite granulation, fiber agglomeration is weakened, the powder density is increased, the cohesive force between carbon fibers is increased, and therefore the biscuit density is increased; and structure accurate forming and surface quality control of the swirler with the complex structure are facilitated.

The present invention relates to the technical field of porous conductive ceramics. Disclosed are a selective laser sintering porous conductive ceramic 3D printing consumable and a preparation method. The selective laser sintering porous conductive ceramic 3D printing consumable comprises the following components in percentage by weight: 30-60 wt% of modified silicon carbide powder, 10-40 wt% of conductive phase powder, 10-30 wt% of a polymer binder, and 0.1-5 wt% of a lipid. The selective laser sintering porous conductive ceramic 3D printing consumable is obtained by means of a direct mixing ball milling method or a xylene solution mixed washing method. A porous conductive ceramic green body is printed by means of a laser 3D printer, and is subjected to thermal debinding and sintering to obtain a ceramic sintered part.

The invention provides a composite material solar interface evaporation device and a preparation method and application thereof. The solar interface evaporation device comprises a photo-thermal layer and a supporting layer, and a plurality of fluid transportation channels are formed in the supporting layer. The photo-thermal layer combines the carbon nano tube and the silver particles to generate an efficient photo-thermal conversion film, so that the photo-thermal conversion efficiency is improved; pVA is adopted as a curing film-forming agent, a PVA aqueous solution is firstly sprayed on the surface of the supporting layer through a laminated spraying method, then the photo-thermal layer is sprayed on the surface of the PVA film layer, and the photo-thermal layer is prevented from being stripped from the supporting layer; the supporting layer is of a hollow conical supporting structure prepared from PA12 through the selective laser sintering (SLS) 3D printing technology, and a capillary triangular tooth-shaped groove is designed to serve as a fluid conveying channel. The evaporation device achieves efficient photo-thermal energy utilization, high seawater evaporation rate and biological pollution resistance, has the advantages of being low in preparation cost, long in service life, environmentally friendly and the like, and has wide application prospects in the fields of seawater desalination and sewage treatment.

The utility model discloses a laser sintering 3D printing device for continuous processing, which relates to the technical field of selective laser sintering processing, and solves the problems that continuous powder supply and non-stop automatic processing cannot be formed, the powder cleaning inside the equipment is complicated, the workpiece is inconvenient to take out after printing, and the loading needs to be done manually, which may cause dust pollution. The utility model realizes non-stop automatic processing and continuous printing, and the printing and powder collection processes are both in a closed environment without causing pollution. The powder inside the equipment is easy to clean and collect, and the collected powder can be reused, which reduces loss and waste. The upper parts of the left upper powder supply module and the right upper powder supply module are both provided with powder supply ports and gas extraction ports, and the gas extraction ports are evacuated to perform negative pressure vacuum, and the material powder is drawn into the left upper powder supply module and the right upper powder supply module, thereby realizing automatic loading without manual loading, and realizing automatic discharging, which is convenient for taking out the workpiece.

An apparatus for 3D printing an object by photo-curing or selective laser sintering with a hybrid lighting system at a constant wavelength and variable power and speed, wherein said apparatus includes:—a first light source and related optical devices of conditioning the light beam, for the emission and processing of a first light beam for photo-curing or sintering said object, wherein said first light beam has a predetermined wavelength and a linear polarization oriented according to a certain angle;—a second light source and related optical devices of conditioning the light beam, for the emission and processing of a second light beam for photo-curing or sintering said object, wherein said second light beam has a wavelength equal to that of said first light beam and a linear polarization oriented according to an angle orthogonal to that of said first light beam.

The invention discloses a preparation method of a cobalt ferrite manganese ferrite L-polylactic acid composite antibacterial bone scaffold, which comprises the following steps: growing manganese ferrite on the surface of cobalt ferrite in situ to prepare cobalt ferrite-manganese ferrite composite powder, and adding the prepared cobalt ferrite-manganese ferrite composite powder into ethanol to prepare a suspension; the preparation method comprises the following steps: preparing cobalt ferrite-manganese ferrite and poly-L-lactic acid composite powder, performing ultrasonic mixing with poly-L-lactic acid ethanol suspension, performing centrifugal drying to obtain the cobalt ferrite-manganese ferrite and poly-L-lactic acid composite powder, and finally performing selective laser sintering to obtain the cobalt ferrite-manganese ferrite / poly-L-lactic acid composite antibacterial bone scaffold. As a novel bone implant, the cobalt ferrite-manganese ferrite / poly-L-lactic acid composite antibacterial bone scaffold prepared by the invention can generate local high temperature and a large amount of active oxygen under the excitation of an alternating magnetic field, so that a good antibacterial effect is achieved.

The invention relates to a medical high polymer material 3D intelligent printing method based on a selective laser sintering process. The method comprises the following steps that optimal initial process parameters are recommended based on material characteristics and part requirements; carrying out processing according to the optimal initial process parameters, and monitoring a processing material in real time through a sensor; if machining defects are monitored, an AI model is adopted to calculate and adjust technological parameters, and meanwhile, local repair is carried out on the detected defects; after printing of each layer is completed, the technological parameter database is updated, and technological parameters of subsequent layers are optimized until the machining process is finished; in the printing process, once defects are monitored, the AI model can quickly calculate and adjust process parameters, manual intervention is not needed, and the time for finding and solving problems is greatly shortened; meanwhile, the reinforcement learning algorithm can continuously learn and optimize a process parameter adjustment strategy, so that adjustment is more accurate and efficient, and repeated printing and repair time caused by unreasonable parameters are reduced.

The invention provides a novel resin-based silicon carbide / graphite / nickel composite wave-absorbing material and a preparation method thereof. The silicon carbide / graphite / nickel composite wave-absorbing material is prepared. The preparation method comprises the following steps: firstly, weighing graphite powder, silicon carbide powder, mullite powder and phenolic resin liquid in proportion, putting into a powder mixer in batches, uniformly mixing, taking out, drying, crushing and sieving to obtain mixed powder; secondly, preparing a graphite prototype model by using a selective laser sintering molding technology, and carrying out secondary curing to obtain a porous graphite preform; and impregnating epoxy resin liquid containing high-purity nickel powder into the porous graphite prefabricated body by using a vacuum pressure impregnation technology, and taking out the porous graphite prefabricated body for cross-linking and curing to obtain the novel resin-based silicon carbide / graphite / nickel composite wave-absorbing material. The preparation method of the resin-based silicon carbide / graphite / nickel composite wave-absorbing material is short in technological process and low in cost, controllable compounding of multiple wave-absorbing agents can be rapidly achieved, and the wave-absorbing agents are assembled into a three-dimensional micro-network structure; the method can be applied to the field of high-frequency electromagnetic wave absorption.

The invention discloses a functional osteochondral repair material which comprises a cartilage layer, a transition layer and a bone layer which are sequentially connected, the cartilage layer takes hyaluronic acid, I-type collagen and chitosan as base materials, the transition layer takes hydroxyapatite and a polylactic acid-glycolic acid copolymer as base materials, and the bone layer takes hyaluronic acid, I-type collagen and chitosan as base materials. The bone layer takes beta-tricalcium phosphate, hydroxyapatite and a polylactic acid-glycolic acid copolymer as base materials, the invention relates to the technical field of medical biological materials, by designing the organic-inorganic composite transition layer, the gradient connection cartilage layer and the bone layer, and the interfacial shear strength is greater than or equal to 0.5 MPa, the problem of interlayer stripping of a traditional layered material is effectively solved, and the medical material has the advantages of high mechanical strength, high mechanical strength and high mechanical strength. According to the selective laser sintering 3D printing material, the shearing stress and the compression stress during joint movement can be borne, mature medical material production equipment such as freeze drying, compression molding and sintering is adopted in the preparation process, large-scale batch production can be achieved, meanwhile, personalized preparation of selective laser sintering 3D printing is supported, and the requirements of different clinical scenes are met.

The utility model relates to an SLS selective laser sintering 3D printer precise powder supply mechanism which comprises a powder storage box, a powder stirrer and a precise powder falling hopper are arranged in the powder storage box, one end of a rotating shaft of the powder stirrer is driven by a motor, the precise powder falling hopper is located on the lower side of the powder stirrer and located at a powder outlet of the powder storage box, and the precise powder falling hopper is provided with a powder falling cavity with the wide upper portion and the narrow lower portion. Partitions formed in the powder falling cavity evenly divide the powder falling cavity into a plurality of powder falling channels, a powder control shaft in the length direction of the powder falling opening is arranged at the position, close to the powder falling opening, in the powder falling cavity, the shaft diameter and length of the powder control shaft are precisely matched with the width and length of the powder falling opening, and a plurality of V-shaped powder grooves in the axial direction are evenly formed in the surface of the powder control shaft. One end of the powder control shaft is driven by a motor. According to the precise powder supply mechanism of the SLS selective laser sintering 3D printer, single-time quantitative precise powder supply can be achieved, it is guaranteed that powder evenly flows out of the powder outlet, and therefore a foundation is laid for providing an excellent powder laying effect for a follow-up powder laying mechanism.

A process embeds functional fibers in a workpiece during selective laser sintering. In a process variant, parts of a powder layer are sintered before the insertion process, for example using a laser beam. A heating device then subsequently re-melts the already melted workpiece parts. Through a channel in the heating device, the functional fiber is fed to the melt or melt-like mass by means of a feed device and inserted into the melt or melt-like mass at the insertion point. Due to the movement of the heating device, the completely or partially melted area moves away from the heating element and is heated less, causing it to cool and solidify comprising the already inserted functional fiber. This variant can also be used for inserting fibers into objects created, for example, by injection molding or extruder-based 3D printing or other additive manufacturing processes.

The utility model discloses an auxiliary positioning mechanism that workpiece is separated from cylinder body belongs to SLM selective laser sintering field, the utility model aims at solving in the metal printing post -processing, when taking out large -size cylinder body workpiece, because of the auxiliary equipment height and cost limit, need first cylinder body drop and turn out, again individually jacking workpiece to the workpiece position, but the cylinder body inner wall friction can cause its with jacking mechanism ascending after because dead weight back and fall, and then damage sealing washer and influence cylinder body and equipment precision, influence the problem of printing use, the utility model discloses a cylinder body, the cylinder body is the cylindrical structure of upper and lower opening, the both sides of cylinder body all movably connect with base, the inside of cylinder body is provided with workpiece platform, the below of workpiece platform is connected with piston plate, the piston plate is through the end face of sealing washer and base and is resisted, be provided with the stop pin on the base, one side of stop pin is connected with the pneumatic cylinder.

A selective heating system for heating a layer of print material on a print bed of a selective laser sintering printer includes a computing module, a light source, and a lens. The calculation module stores a print pattern for printing a three-dimensional object. The light source emits light corresponding to a printed pattern. The lens focuses light corresponding to a print pattern onto a print material on a print bed.

The present invention relates to the technical field of polymer powder materials for additive manufacturing, and more particularly to a method for preparing epoxy resin-reinforced polystyrene composite powder for selective laser sintering. To address the common problem of low sintered component strength associated with polystyrene powder for selective laser sintering, the present invention directly produces epoxy resin-reinforced polystyrene composite powder for selective laser sintering by mixing styrene, epoxy resin, a flow aid, and the like, followed by a polymerization reaction. The powder particles are spherical or ellipsoidal, exhibit good powder fluidity, and the preparation method is simple, with low energy consumption and equipment investment. The reaction product is easily separated from the solid and liquid phases, resulting in significantly stronger components than those of polystyrene.

The selective laser sintering 3D printing device comprises a printing platform, the printing platform is provided with a containing cavity, a lifting piston plate is arranged on the inner side of the containing cavity, and the area, located above the lifting piston plate, of the containing cavity serves as a forming groove; the lifting piston plate is provided with two discharging openings, the two discharging openings are arranged side by side in the transverse direction of the lifting piston plate at the same time and staggered in the longitudinal direction of the lifting piston plate, and the two discharging openings are arranged in the longitudinal full-length direction of the lifting piston plate. The lifting piston plate is provided with two sealing pieces used for sealing the discharging opening, and the sealing pieces can move in a lifting mode. Air supply gaps are formed in the side walls of the two opposite sides of the containing cavity correspondingly and used for conveying airflow, and the air supply direction of the air supply gaps is arranged in the transverse direction of the lifting piston plate. A vibrator is arranged on the downward side of the lifting piston plate and used for vibrating the lifting piston plate and the sealing piece. According to the forming device, residual powder in the forming groove can be cleaned and recycled as much as possible from the discharging opening.

A method for manufacturing a graphene-incorporated UHMWPE structure, the method comprising the step of i. providing a build chamber having a vertically movable platform defining a build plate, on which SLS In a 3D printing process, powder material may be sintered layer by layer, and the method further includes: ii. preheating a build chamber; iii. reducing the pressure in the build chamber and / or supplying an inert gas into the build chamber; iv. depositing a UHMWPE powder layer on a build plate to define a print bed; v. exposing a selected area of ​​the UHMWPE powder layer to at least one first laser light source to create a sintered region of the UHMWPE powder layer; vi. exposing a selected area of ​​the UHMWPE powder sintered region to at least one second laser light source to induce graphene formation derived from the UHMWPE powder; vii. lowering the platform by one step corresponding to the thickness of the UHMWPE powder layer and depositing a further UHMWPE powder layer thereon; and viii. repeating steps (v) to (vii) until the structure is complete.

The invention relates to a conveyor track (10) for a vibratory conveyor, which conveyor track is designed to guide an object (16) to be conveyed, during its movement, over a predetermined conveying path (S) along a transport direction (T), and at the same time to rotate the object (16) by a predetermined conveying angle, in particular by 180°, about a conveyor-track central axis (C) which extends parallel to the transport direction (T), wherein the conveyor track (10) comprises a guiding arrangement (12) having a plurality of guide rails (14) which wind around the conveyor-track central axis (C) along the conveying path (S) in accordance with the conveying angle, and wherein the conveyor track (10) is produced in one piece by an additive manufacturing process, for example by selective laser sintering or 3D printing, preferably from stainless steel.

The invention discloses a preparation method and application of a nano silicon dioxide / wood-plastic composite material for selective laser sintering, relates to a preparation method and application of a polymer wood-plastic composite material for selective laser sintering, and aims to solve the technical problems of high surface roughness and large size deformation of an existing selective laser sintering wood-plastic printing material. The method comprises the following steps: drying poplar powder, carrying out alkali treatment, adding the alkali-treated poplar powder and KH550 into an ethanol solution, carrying out water-bath heating reflux treatment, and drying to obtain the poplar powder treated by KH550; uniformly mixing with pure polyethersulfone powder, calcium carbonate, nano silicon dioxide powder and glycerol, sealing and standing to obtain the composite material. The surface roughness of a part printed by the material through a selective laser sintering process is 7.6-10.6 mu m, the size deformation is 1.7%-4.2%, the tensile strength is 2.4-3.2 MPa, and the hardness is 49-59 HA. The method can be used in the 3D printing field.

The application discloses a microstructure evolution prediction method in a selective laser sintering additive manufacturing process, according to the microstructure evolution characteristics of the selective laser sintering additive manufacturing, starting from the free energy density functional of the system, the time and space evolution expressions of temperature, conservative order parameter and non-conservative order parameter are derived in thermodynamic self-consistency, the Cahn-Hilliard equation containing temperature gradient driven diffusion and the determination method of model parameters are given, and numerical calculation is realized through finite element programming. Combined with powder bed laying and finite element calculation, the non-isothermal phase field model can simulate the sintering neck, grain boundary migration and other microstructure evolution in the selective laser sintering additive manufacturing process, simulate the influence of the huge temperature gradient in the selective laser sintering additive manufacturing, optimize the process parameters of the selective laser sintering additive manufacturing, reveal the influence law of the process parameters of the selective laser sintering additive manufacturing on the microstructure evolution and the final microstructure, and improve the design efficiency of the selective laser sintering additive manufacturing.

The invention discloses a lateral lifting temperature-controllable and powder-leakage-proof forming cylinder device of an SLS3D printer, and belongs to the field of selective laser sintering equipment. Comprising a forming cylinder, the outer side wall of the forming cylinder is fixedly connected with a side face lead screw guide rail structure through a connecting piece, and a connecting pin is arranged on the outer side wall of the forming cylinder; through the lead screw module and the connecting pin, the forming cylinder can complete jacking of the printing platform from the side face, and the overall height of equipment is reduced. The periphery of the outer wall of the forming cylinder is wrapped with a polyimide (PI) heating film, and a heating plate and a temperature sensor are designed at the bottom of a printing platform, so that in the part printing process, even if the printing platform continuously descends and is continuously far away from an infrared heating area on the upper layer, the temperature in the cylinder body can still be controlled within + / -3 DEG C of the set temperature; compared with heating films made of other materials, the polyimide heating film used in the scheme is thin in thickness and more uniform in temperature field.

The embodiment of the application discloses a kind of test verification method, device and equipment of engine air passage, obtain the casting model of engine cylinder cover, and input to the casting simulation software to obtain the deformation condition of casting model.According to the deformation condition, obtain the correction model of engine cylinder cover, and print the engine air passage entity model in engine cylinder cover correction model using selective laser sintering printing technology.The entity parameter of entity model is obtained and compared with design parameter.When the comparison result is that entity parameter is inconsistent with design parameter, the casting process of casting model is adjusted according to the result to adjust the casting model or adjust the engine cylinder cover correction model.The application predicts the deformation condition of cylinder cover casting process based on casting simulation software, and can quickly test the performance index of air passage while ensuring the consistency of size through printing technology, improve the accuracy and efficiency of air passage development.

The invention relates to a tablet (2), wherein the tablet (2) comprises a plurality of precursor material particles (9) bonded to one another by selective laser sintering, wherein the precursor material particles (9) comprise a granulate particle (6) having a granulate particle diameter (60) and a coating layer (27) enclosing the granulate particle (6) and having a layer thickness (40), wherein the granulate particle (6) comprises a medicinal substance (5) and the coating layer (27) is formed from a coating agent (8) comprising a thermoplastic material (7), wherein the coating layers (27) form a coating layer matrix (64) in which the granulate particles (6) are embedded.

The invention discloses a selective laser sintering equipment light path debugging device and method in the technical field of 3D printing, the device comprises a base, a supporting plate, a light source support and a groove stand column, the supporting plate is provided with a light through hole, a first embedded magnet and an insertion piece type diaphragm, and the light source support is provided with an angle adjusting set, a locking assembly and an ultraviolet light source assembly; a second embedded magnet and a carbon dioxide laser frequency doubling sheet are arranged on the groove stand column; the insertion type diaphragm and the carbon dioxide laser frequency doubling sheet are installed on the base in a side face assembling and disassembling mode, the installation and operation mode is simple and convenient, and the safety risk caused by the fact that the hand stretches into a light path in the dimming process is effectively avoided; the insertion type diaphragm and the carbon dioxide laser frequency doubling piece are both fixed in a magnetic attraction mode, it is guaranteed that the insertion type diaphragm and the carbon dioxide laser frequency doubling piece are stably fixed to the corresponding positions in the dimming process, the loosening phenomenon is avoided, and therefore the dimming precision is greatly improved, and meanwhile repeated disassembly is facilitated; the base is fixed through positioning pins and screws, and the stability of the whole device is ensured.

A system and a method for selective laser sintering by a system that has a selective laser sintering device and at least one regulating device. The regulating device is coupled to the selective laser sintering device and to an analysis device integrated into the system. The analysis device may analyze a proportion of a powder material, which is used in the selective laser sintering, during a sintering process. The regulating device may adjust the sintering process based on the analyzed powder material.

The application relates to the technical field of biomedical materials and discloses a preparation method of a zinc oxide-aluminum oxide ceramic bone repair support; first, aluminum oxide granulated powder and phenolic resin powder are weighed according to proportions, the aluminum oxide granulated powder and the phenolic resin powder are mixed, and 3D printing composite powder is obtained; second, the 3D printing composite powder is prepared into an aluminum oxide ceramic body through a selective laser sintering device; the aluminum oxide ceramic body is dried to obtain a dried ceramic body, the dried ceramic body is subjected to defatting and sintering treatment, and an aluminum oxide preformed body is obtained after cooling; finally, the aluminum oxide preformed body is subjected to vacuum pressure impregnation by using a nano zinc oxide sol, and a dynamic optimization algorithm is introduced to optimize vacuum pressure impregnation parameters, so that the zinc oxide-aluminum oxide ceramic bone repair support is obtained; the zinc oxide-aluminum oxide ceramic bone repair support is obtained through a preparation process and intelligent optimization of process parameters, and the method is objective and accurate.

The invention relates to the technical field of 3D printing materials, in particular to nylon powder for 3D printing and a preparation method thereof.The nylon powder which is easy to color and has color stability and is used for 3D printing is prepared from modified nylon, a nucleating agent, an antioxidant, a dispersing agent and an auxiliary through a selective laser sintering technology; the low viscosity and high diffusivity of supercritical carbon dioxide are utilized, an active monomer 1, an active monomer 2 and isobornyl methacrylate are subjected to a free radical polymerization reaction, a polymer coating obtained through the reaction permeates into the nylon subsurface, the nylon powder is colored, and meanwhile the overall thermal stability and mechanical performance are improved; wherein a colored azo group in the active monomer 1 can enhance an intermolecular force through pi-pi accumulation energy, so that the thermal stability of the nylon powder is improved, the active monomer 2 has relatively good compatibility with nylon molecules, and the active monomer 2 and the antioxidant synergistically exert an antioxidant effect, so that the nylon powder has a wide application prospect.

The present disclosure relates generally to the use of poloxamers in additive manufacturing technologies and techniques. More specifically, the present disclosure relates to the use of poloxamers in selective laser sintering (SLS) processes for additive manufacturing of objects, in particular pharmaceutical dosage forms.

A powder, called composite-based additive manufacturing (CBAM), is formed from waste products from various processes (injection molding, selective laser sintering) that are processed to have a particle size and distribution optimal for 3D printing technology. Alternative recycling processes include milling and sieving, emulsion extrusion, and liquid-liquid phase separation.

The invention discloses a system and a method for carrying out selective laser sintering by using the system. The system comprises a selective laser sintering device and at least one regulation and control device. And the regulation and control device is connected with the selective laser sintering device and the analysis device integrated into the system. The analysis device may analyze a portion of the powder material used for selective laser sintering during the sintering process. The regulation device can regulate the sintering process based on the analyzed powder material.

The utility model discloses a micro-grid venting plug for venting of a tire mold, which belongs to the technical field of tire molds and comprises a solid part, and the solid part comprises a sleeve shell and a plurality of rib plates. The sleeve shell is in a hollow tubular shape, and the rib plates are located in the sleeve shell. The sleeve shell and the rib plates are formed through a selective laser sintering process and are compact and airtight; unsintered powder particles in gaps between the sleeve shell and the rib plates form a ventilation part, exhaust gaps are formed in the ventilation part, and a plurality of exhaust gaps are communicated to form an exhaust channel. The micro-grid venting plug is manufactured through the 3D printing technology, the entity part is manufactured through the selective laser sintering technology, then the ventilation part is formed, the technology is simple, the structure is stable, the strength is high, the venting plug is not prone to damage, and the maintenance difficulty is reduced.