129 results about "4d printing" patented technology

The invention discloses a reversible metal 4D printing method based on hydrogel reversible deformation and a metal part, and belongs to the field of metal additive manufacturing. The method comprises the following steps: firstly, constructing a three-dimensional model comprising a hydrogel driving layer and a metal blank layer; respectively preparing hydrogel light-cured ink and metal or precursor slurry thereof; printing the two layers of materials sequentially or alternately by adopting a photocuring printer to obtain a composite green body; the hydrogel layer is dehydrated and shrunk through drying, the component is driven to generate preset shape deformation, the hydrogel layer absorbs water and expands through soaking, and reversible recovery of the shape of the component is achieved; and degreasing, selective reduction and sintering heat treatment are conducted on the component, and the compact final metal component is obtained. According to the invention, the independent hydrogel layer is used as a deformation driver, the dependence on the intrinsic phase change characteristic of a metal material is avoided, the material universality is extremely high, the method can be widely applied to 4D printing of various materials including refractory metal and high-reflection metal, and reversible control of shape change is realized.

The invention provides a 4D printing esophageal stent and a preparation method thereof. The esophageal stent comprises a stent main body and a drug-loaded fiber membrane with a core-shell structure, the stent main body is a tubular stent composed of a bionic water lily hollow structure; the diameters of the head end and the tail end of the support body are larger than the diameter of the middle section, and barb structures are arranged on the outer surfaces of the head end and the tail end. The stent main body is a biodegradable shape memory polymer; the drug-loaded fibrous membrane is positioned on the outer surface of the middle section of the stent main body, and the drug-loaded fibrous membrane contains drugs. The 4D printing esophageal stent provided by the invention has excellent compressive bearing capacity and anti-slip capacity, and the drug-loaded fibrous membrane can avoid esophageal restenosis through long-term uniform slow release of drugs, so that the life safety of a patient can be further guaranteed.

The present application relates to the field of intelligent protection, and particularly relates to a 4D printing system and method of a bionic energy-absorbing honeycomb structure with adjustable configuration, which can consider deformation and efficient energy absorption when facing different collision conditions, fully protect the integrity of the passenger cabin or cargo cabin, and effectively reduce the injury of passengers or goods. The printing device contains a double-material extrusion system, a control system and a dynamic forming platform. The double-material extrusion system integrates a digital magnetic control system with an auxiliary magnetic field material extrusion system. In the printing process, by planning the printing path and applying a magnetic field, a patterned ferromagnetic domain pattern can be obtained while forming a complex honeycomb structure. Under the coupling effect of a high-frequency induction heater and a driving magnetic field, combined with the dynamic chemical properties of the base material, the obtained honeycomb structure can adjust the cell structure and material stiffness of the honeycomb material to cope with different collision conditions, realize active intelligent protection, and has great application potential in the field of transportation.

The invention provides a 4D printing path planning method based on fiber orientation and layering sequence, and relates to the technical field of intelligent additive manufacturing, and the method comprises the following steps: designing a two-dimensional plane precursor model according to a target three-dimensional structure, and dividing a deformation area and a non-deformation area; differentiated printing paths and material layouts are planned for different areas, material anisotropy is programmed by setting the movement angle of a printing spray head, and the stacking sequence and the thickness proportion of material layers are controlled; a multi-material composite printing process is adopted, PLA is deposited in the deformation area, and PETG is deposited in the non-deformation area; and finally, applying thermal stimulation at 70-75 DEG C to the component, so that the component is autonomously deformed into a three-dimensional functional component from a two-dimensional plane. Structural integrated manufacturing is achieved, deformation is accurate and controllable, interface combination is reliable, and the light weight and assembly efficiency is remarkably improved.

The invention relates to a 4D printing bionic artificial limb and a preparation method and application thereof, and relates to the technical field of medical rehabilitation instruments, the bionic artificial limb comprises a bionic skeleton and a flexible driving unit; the flexible driving unit is located at a joint moving part of the bionic skeleton and is used for driving the bionic skeleton to move; the bionic artificial limb is integrally formed through 4D printing, the bionic skeleton is made of a shape memory composite material, and the flexible driving unit is made of a hydrogel driving material; the shape memory composite material comprises a shape memory polymer and a reinforcing material in a mass ratio of (80-95%): (5-20%); the hydrogel driving material comprises a thermo-sensitive polymer matrix, a stabilizer and a functional filler in a mass ratio of (50%-80%): (20%-40%): (3%-15%). The 4D printing bionic artificial limb has the dynamic adjusting capacity, and the change requirements of the residual limb under different conditions can be met.

The invention provides a manufacturing process of a micro supercapacitor based on femtosecond laser 4D printing, which relates to the technical field of energy storage device manufacturing, and comprises the following steps: providing a substrate which is glass, a silicon wafer, a polymer film or a metal foil, and pre-treating the surface of the substrate to obtain a pre-treated substrate; and the pretreated substrate is coated with carbon quantum dots and shape memory epoxy resin to form a composite material layer. According to the manufacturing process of the micro supercapacitor based on femtosecond laser 4D printing, a femtosecond laser technology is combined with optical flow control printing and infrared laser irradiation, a porous structure can be accurately constructed in a composite material layer, a deformation state is solidified and fixed through infrared laser, and a novel manufacturing method of the micro supercapacitor is provided; a high-precision miniature capacitor structure is realized, and the energy storage capability and the cycling stability of the capacitor are effectively improved.

The utility model discloses an in-situ preheating device for a 4D printing composite material, and relates to the technical field of 4D printing. The wire cutting device comprises a mounting seat, a laser head is fixedly mounted on the outer surface of the mounting seat, a support is fixedly mounted at the top of the mounting seat, an adjusting assembly and a wire feeding assembly are arranged on the outer surface of the support, a wire cutting assembly is arranged at the bottom of the mounting seat, and a clamping assembly is arranged on the outer surface of the wire cutting assembly. The adjusting assembly is used for adjusting the size of the wire feeding assembly, and the wire feeding assembly is used for driving the prepreg wires to conduct movable wire feeding. Through connection of the adjusting assembly and the wire feeding assembly, when the adjusting assembly is rotated, the adjusting assembly converts rotary motion into linear motion and pushes the wire feeding assembly to do linear motion at the same time, so that the wire feeding assembly can be folded or separated, and gaps in the wire feeding assembly are changed; therefore, the wire feeding assembly can be in close contact with different prepreg wires to ensure the accuracy of a wire feeding path.

The present application relates to the technical field of materials, in particular to a multi-stage solidification shape memory polymer for 4D printing and a preparation method thereof. In view of the problem that it is difficult to build gradient mechanical functions by precisely regulating the structure modulus in a single structure of 4D printing, the present application obtains a single-component multi-stage solidification shape memory polymer by regulating the ratio of toluene-2, 4-diisocyanate-hydroxypropyl acrylate, shape memory polymer, polyethylene glycol 400 and 1, 3, 5-tris (6-isocyanate hexyl) -1, 3, 5-triazine-2, 4, 6-trione under the test feedback of the printing structure modulus, and solves the problem that it is difficult to build gradient mechanical properties in a single structure of 4D printing.

This invention relates to the field of printer nozzle technology, and more particularly to a high-precision FDM 4D printing nozzle for metal-plastic functional graded structures. The nozzle includes a first feeding device, two second feeding devices, a feeding connector, a water cooling device, a melting and stirring device, a feeding conduit shell, and multiple filament guides. This invention solves the problems of poor material mixing uniformity in existing technologies. In the design and fabrication of plastic functional graded structures, the composite precision and segregation of the plastic directly affect the performance and interface quality of the functional graded structure. Current plastic functional graded structure designs mainly focus on different material content ratios, requiring material design to be completed before molding. This results in a small range of material variability and poor flexibility. Furthermore, uneven plastic mixing directly causes inconsistencies between the functional graded structure performance and the design, severely leading to interface cracking and molding failure.

The invention provides a preparation method of a PLA / TPU based 4D printing composite material. The method comprises the following steps: weighing PLA, TPU, dicumyl peroxide (DCP) and maleic anhydride grafted polyethylene (MAH-g-PE) according to a specific ratio; drying the raw materials; carrying out melt blending and granulation in a specific temperature interval through a double-screw extruder; and finally, extruding the composite granules to prepare the printing wire material with the standard diameter. According to the method, through optimized process steps and parameters, the synergistic effect of the DCP cross-linking agent and the MAH-g-PE compatibilizer in the processing process is effectively promoted, and cross-linked network construction and interface compatibility are synchronously completed through a one-step method. The prepared composite wire is stable in specification and good in printing adaptability, the finally obtained 4D printing product has the advantages of being compact in interface bonding, excellent in shape memory performance and balanced in mechanical property, and the method is good in repeatability and suitable for industrial application.

A 4D printing intelligent structure design method based on a convolutional neural network comprises the following steps: parametric modeling and data generation: controlling finite element software through a script to construct a'material parameter field-target deformation field 'sample data set in batches; data preprocessing and geometric standardization: uniformly converting a complex design domain into a standard rectangular domain by adopting a conformal mapping technology, and realizing high-fidelity standardization of physical field data; constructing a U-Net + ResNet hybrid convolutional neural network, and combining with composite loss function training to synchronously optimize global and key region deformation prediction precision; performing standardization processing on the new design after model deployment to realize second-level high-precision deformation prediction; the physical space design is restored through inverse mapping, multi-material 4D printing manufacturing is driven, and a deformation verification closed loop is completed. According to the method, the limitation of complex geometric boundaries is broken through, the nonlinear and multi-physics field coupling characteristics of the intelligent material can be accurately represented, and the practicability of the scheme is ensured by the constructed'design-prediction-manufacturing 'integrated process.

The application discloses a kind of soft material 4D printing method and device with regionalized magnetic domain direction.The method comprises the following steps: establishing partition three-dimensional model and planning printing path to generate original G code;Based on the preset magnetic domain direction requirement, obtain the driving parameters of multiple magnetic poles by magnetic field model reverse decoupling, and re-edit G code to integrate magnetic field control and UV light control instruction;Prepare UV-curable soft material containing magnetic particles;After setting printing parameters, execute printing, synthesize three-dimensional magnetic field of preset direction at extrusion point when material extrusion makes magnetic particles directional, and delay to open UV light curing to lock magnetic domain direction.The application realizes three-dimensional space regionalization editing of magnetic domain direction inside soft material, significantly improves the deformation design freedom and motion control accuracy of 4D printing product, and provides reliable technical support for integrated manufacturing of complex driven soft robot.

The application provides a training mold and a design method for 4D printing of a shape memory alloy wing, and belongs to the technical field of aerospace vehicles. The purpose is to solve the problems of insufficient deformation precision, easy damage to the structure caused by stress concentration, long design trial and error period, high cost, and poor consistency of the training effect of components in the prior art. A driving mechanism and an upper mold are installed on a lower mold; the upper mold is provided with a first assigned camber line and a slider track at the top; a driving sleeve is installed in the upper part of a driving rod, and the bottom of the driving sleeve is provided with a slider; a placing platform is arranged on the lower mold, a supporting protrusion is arranged in the middle, a lower base platform is arranged between the placing platform and the supporting protrusion, and the supporting protrusion is provided with a second assigned camber line; and a curved wing is arranged on the base platform. The application solves the problems of insufficient deformation precision, easy damage to the structure caused by stress concentration, long design trial and error period, high cost, and poor consistency of the training effect of components in the prior art.

The invention provides a micro interdigital supercapacitor manufacturing process based on optical flow control femtosecond laser 4D printing, and relates to the technical field of micro energy storage and advanced manufacturing, comprising: processing a micro-channel network on a silicon-based substrate, the micro-channel network comprising a sheath flow channel and a core flow channel, and constructing hydrophobic layers on the surfaces of the sheath flow channel and the core flow channel to form a micro-channel structure. According to the manufacturing process of the miniature interdigital supercapacitor based on optical flow control femtosecond laser 4D printing, the manufacturing of the miniature interdigital supercapacitor is successfully realized by processing a micro-channel network on a silicon-based substrate and combining a femtosecond laser 4D printing technology and a shape memory effect. Quantum dots and shape memory epoxy resin are mixed to form a composite filler, and two-photon polymerization curing induced by femtosecond laser is carried out to accurately construct an interdigital electrode framework, so that high performance and reversible deformation characteristics of the capacitor are ensured.

The application provides a 4D printing method for complex branched blood vessel structure based on illumination. The printing method is to obtain a precursor solution by dissolving and mixing a compound having a ortho-nitrobenzyl four-arm polyethylene glycol and a methacrylated hyaluronic acid with PBS; a modeling software is used to create a tube model of the complex branched blood vessel, wherein the tube model comprises a Y-shaped tube model, a T-shaped tube model, a first-stage branched tube model and a second-stage branched tube model; the prepared precursor solution is put into a DLP printer tank, material printing is performed according to a design scheme based on the tube model to be printed to form a tube piece structure, the tube piece structure is completely soaked in a PBS solution to self-curl to form a complex branched blood vessel structure, and the complex branched blood vessel structure is subjected to secondary crosslinking under ultraviolet light to form a closed complex branched blood vessel structure. The printing model of the complex pipeline is designed, integrated printing is performed, the model design of the connection is decoupled by changing the radial expansion characteristics of the 4D material to realize the self-curling curvature of the complex closed pipeline, and the 4D printing of the complex closed pipeline is realized.

The invention provides a pH response type MOF (Metal Organic Framework) material, a composite photosensitive resin system containing the pH response type MOF material and application of the pH response type MOF material in a dental appliance. The pH response type MOF material is a multifunctional metal organic framework material (Guardian-MOF) with a'core-shell-satellite 'structure, the MOF is chemically bonded into a light-cured resin matrix to form intelligent composite resin capable of 3D / 4D printing, and a prepared orthodontic appliance has required mechanical properties macroscopically so as to complete an orthodontic function, and has the advantages of being simple in preparation process, low in cost and the like. The oral cavity antibacterial and targeted remineralization treatment system is a distributed and intelligent'micro clinic 'microcosmically, can accurately respond to an oral cavity pathogenic microenvironment (low pH) and cooperatively execute multiple antibacterial and targeted remineralization treatment, and has a remarkable application prospect.

The application discloses an intelligent response type alkali-activated concrete and a digital twin design and 4D printing method, and belongs to the technical field of building materials and intelligent construction. The concrete has three-dimensional non-uniformly distributed functional materials inside, and the functional materials include intelligent response microcapsules with a four-layer structure of "core-shell-membrane-lubricating layer" and a hydrophobic agent. The application builds a new technology paradigm of "digital twin driven design, intelligent material creation, 4D printing precise construction, and whole-cycle intelligent management", realizes the precise distribution and dynamic regulation of the performance of the concrete material in the component according to needs, time and place, and synchronously solves key problems such as printing rheological regulation, microcapsule protection, interlayer penetration and sensor longevity, so that the durability, safety and service life of the concrete structure in a complex environment are greatly improved, and the application is suitable for long-life infrastructure engineering in extreme and harsh corrosive environments such as cross-sea bridges, undersea tunnels and saline-alkali land buildings.

The application provides a combustion chamber and method for suppressing oscillating combustion based on 4D printing technology, the combustion chamber comprises a flame tube casing and a flame tube head, a flame tube is coaxially arranged in the flame tube casing, an air passage is formed between the outer wall of the flame tube and the flame tube casing, during the combustion process, the intelligent corrugated unit arranged on the inner wall of the flame tube improves the speed of sound wave attenuation and dissipation at the boundary, restrains the coupling of pulsating sound wave and pressure fluctuation, and then suppresses the oscillating combustion in the initial stage, and the intelligent corrugated unit made by the 4D printing technology can produce surface deformation under the excitation of the predetermined excitation temperature, and reduces the interference of the intelligent corrugated unit on normal combustion in the stable combustion process.

This invention relates to the field of solid-state electrolyte battery technology, specifically to a 4D-printed gel solid-state electrolyte, a printing method, and a solid-state battery. This application utilizes 3D printing technology to pre-construct a solid-state electrolyte composed of an insoluble polymer framework and a soluble polymer functional phase. When a trace amount of electrolyte is introduced, this structure undergoes a predetermined, controllable evolution over time—the soluble components rapidly dissolve and gel in situ, dynamically coating the surface and pores of the insoluble framework, thereby forming a gel electrolyte that combines a stable three-dimensional framework with a high ionic conductivity gel interface layer. This achieves a 4D-printed gel solid-state electrolyte. This 4D-printed gel solid-state electrolyte effectively buffers volume changes and significantly reduces interfacial impedance. Simultaneously, its insoluble framework ensures mechanical strength and dimensional stability, while the extremely low electrolyte usage fundamentally improves battery safety and cycle performance.

The present invention belongs to the technical field of starch hydrogel materials, and discloses a starch gel material based on 4D printing technology and its preparation method and application, the preparation method comprising the following steps: (1) gelatinizing a mixture of carboxyl starch and water, and adding an iron source to obtain a uniform mixture; (2) transferring the mixture to the barrel of a 3D printer, and printing and shaping through hot extrusion 3D, obtaining a 3D printed sample and performing 4D printing stimulation; the 4D printing stimulation is an alkali liquor stimulation, and the pH of the alkali liquor is 8-12; (3) the 4D printed sample is immediately frozen, and then vacuum freeze-dried to obtain a starch gel material. The present invention applies hot extrusion 4D printing technology to the preparation of a starch-based mineral supplement for the first time, which can suppress the release of iron ions in the stomach and achieve efficient iron supplementation. The present invention has simple process, is environmentally friendly, and is easy to repeat and mass-produce.

This invention discloses a locking and release device for a 4D-printed small satellite based on SMA (Super-Magnetic Atomizing) technology, belonging to the fields of aerospace and biomimetic 4D printing technology. The device consists of a main supporting shell 1, a launch platform 2, an auxiliary drive device 3, a locking lever 4, a locking and release spring assembly 5, and an energy storage spring assembly 6. The auxiliary drive device 3 controls the downward movement of the locking mechanism through temperature changes of the inner and outer springs, thereby compressing the energy storage spring assembly 6 and heating it to achieve autonomous energy storage. The launch platform 2 supports the satellite at its upper end and is tightly connected to the energy storage springs at its lower end. The locking and release spring assembly 5 is used to lock the satellite and drive its release. In summary, this invention provides a locking and release device for a 4D-printed small satellite based on SMA, making the failure modes of the satellite launch device effectively controllable and improving the device's adaptability to the extreme environment of space.

The application provides a bio-fluorescent intelligent membrane and a preparation method and application thereof, and the preparation method comprises the following steps: (1) adding isocyanate monomers and amino compounds into a first solvent and stirring to react; (2) adding a bio-fluorescent agent and a hydroxyl compound into the reaction system and stirring to react, so as to obtain a polyurea reactant; wherein the bio-fluorescent agent is obtained by addition polymerization reaction with the isocyanate monomers and the amino compounds as reaction raw materials; (3) printing into a film by using the polyurea reactant as a printing line by means of 4D printing, so as to obtain the bio-fluorescent intelligent membrane. In the application, the bio-fluorescent agent is self-prepared, and the bio-fluorescent agent and the hydroxyl compound are introduced into the polyurea material to perform polymerization reaction, so that the bio-fluorescent polyurea intelligent membrane has excellent bio-fluorescent performance; the bio-fluorescent intelligent membrane of the application has no toxic side effects on cells, has good biocompatibility, has good shape memory performance, and can realize intelligent regulation and control.

The application discloses a wide-temperature-range shape memory composite material and a 4D printing preparation method thereof.The 4D printing preparation method comprises key steps of composite material skeleton preparation, hot extrusion forming of the composite material, post-treatment regulation and control of the functional characteristics of the composite material, and the like.The wide-temperature-range shape memory composite material prepared by the application solves the problem of large-scale production of current shape memory composite materials, can realize shape change of the shape memory alloy under multi-temperature regulation, can realize phase change at room temperature and at high temperature of 200 DEG C, and can realize shape memory functions of three shapes.Compared with traditional shape memory alloys, the wide-temperature-range shape memory composite material prepared by the application can realize more postures, thereby meeting specific functional requirements through temperature change, and has wide application prospects in the fields of medical devices, automobile industry, building and civil engineering, aerospace and the like.

The application discloses a kind of 4D printing nickel-titanium-based shape memory alloy and preparation method thereof.The preparation method includes powder preparation, double-model construction, path energy coupling 4D printing forming three steps, and its core is through the two scanning strategies of path energy coupling, first melt preformed alloy powder, then in-situ homogenization heat treatment preformed layer, to realize the uniform distribution of dispersed nano precipitated phase in equiaxed crystal and columnar crystal matrix, and 4D printing nickel-titanium-based shape memory alloy is prepared.The preparation method of the application has the advantages of short process cycle, low energy consumption, simple process and good stability, and the prepared nickel-titanium-based shape memory alloy and its components have excellent mechanical properties, functional characteristics, functional stability and fatigue life, and have good popularization and application prospect.

The application discloses a model-free adaptive control method based on a 4D printing crawling robot, and comprises the following steps: a step of establishing a dynamic linearization data model; a step of calculating the value of the pseudo partial derivative at the current time by using a pseudo partial derivative estimation algorithm and a model-free adaptive controller; and a step of calculating the input signal value at each time by using the model-free adaptive control algorithm, and realizing step control and behavior control of an executing device of the 4D printing crawling robot by using input and output data of the model-free adaptive control algorithm. According to the application, the data-driven control of the 4D printing soft crawling robot can be realized, and the accurate behavior control and step control of the bidirectional crawling robot can be realized.

The present invention discloses a 4D printed bionic power amplified small satellite locking and releasing device, which belongs to the field of aerospace and bionic 4D printing technology. It includes: a main body shell, protective blades, a drive spring, a launch support platform and a satellite connection locking platform. The device draws on the bionic power amplification mechanism of organisms, combines the rapid response of the bistable structure and the large driving force of the latch structure, and designs a separation structure in which the drive spring and the bistable circular shell are connected in series. The device has both high-speed response and strong driving force; the 4D printed structure of special materials is used to change its shape and performance under different conditions to realize the logical sequence control locking and separation of the device. In summary, the present invention has the advantages of simple structure, high reliability, small impact, fast response speed, and large driving force.

The application provides a multifunctional intestinal stent and a preparation method thereof. The multifunctional intestinal stent comprises, from outside to inside, an anti-tumor layer, a load-bearing layer and an anti-stenosis layer. The anti-tumor layer comprises an outer layer and an inner layer, wherein the outer layer is a nanofiber membrane containing MXene, and the inner layer is a composite membrane containing a chemotherapeutic drug, and the inner layer is in contact with the outer side of the load-bearing layer. The load-bearing layer is a tubular stent obtained by 4D printing of a shape memory polymer material. The anti-stenosis layer contains triprolidine. The multifunctional intestinal stent provided by the application can not only rapidly and continuously treat intestinal obstruction caused by space-occupying tumors, but also facilitate coordinated deformation, reduce tissue abrasion, and has an anti-restenosis function, so as to better maintain normal intestinal function.

The invention discloses a 4D printing precise self-forming curved surface manufacturing method. The method comprises the steps that triangular meshing is conducted on a 3D model of a target to be manufactured; mapping to a 2D plane domain to form a 2D grid, discretizing the 2D grid, and completing 2D layout; a flat plate structure is generated according to the data, the flat plate structure is formed by splicing a plurality of triangular body blocks through connecting pieces, grooves for arranging the connecting pieces are formed in the triangular body blocks, the connecting pieces shrink under thermal driving, and the triangular body blocks do not shrink under thermal driving; the adjacent triangular body blocks are aligned and contacted through the side walls of the triangular body blocks, and the side walls of the triangular body blocks guide the adjacent body blocks to be connected at a target angle; 3D printing of a flat plate structure; and thermally driving and processing. According to the 4D printing accurate self-forming curved surface manufacturing method, through accurate design of the angle of the side wall of the triangular block in the flat plate structure, accurate control over later material deformation can be achieved, thermal driving does not need to be accurately controlled, and dependence on accurate temperature control is reduced.

The application discloses a kind of light control modulus transition 4D printing polymer composite material and preparation method thereof, it is related to material technical field, the application is aimed at the problem that structure modulus is difficult to accurately control and lacks function in 4D printing structure, by being compounded photo-thermal nano material to ATHP system, NIR is used to realize the accurate control of printing structure modulus, trace WO 3‑x The existence of NPs helps to realize the controllable photo-thermal characteristics of the printed nanocomposite material, therefore, the ATHP NC system can realize the arbitrary combination of soft and hard regions of the printed structure under the radiation of NIR, compared with multi-material printing, the application reduces the cumbersome steps of changing printing materials, and avoids the interface bonding problem that may be generated during printing, the material preparation process described in the application is simple, the reaction is controllable and can be industrialized production, the cost is low, and only through simple NIR radiation, the in-situ adjustment of the sensitivity of the flexible sensor and the in-situ strengthening of the microstructure of the finger sensor can be realized, which widens the design space of the printed device.