64 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 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 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.

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 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.

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.

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 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 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 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.

The present invention provides a photopolymerisable composition for 4D printing, comprising an acrylated polyol (AOPO) derived from a natural oil, such as olive oil, and acrylic acid as a comonomer. The composition is used in a solvent-free digital light processing (DLR) method to fabricate high-resolution, multifunctional objects. The resulting 4D printed objects are biocompatible, hemocompatible, and cytocompatible. They exhibit excellent temperature- responsive shape memory properties activated near body temperature, inherent antimicrobial activity against both gram-negative and gram-positive bacteria, and tuneable mechanical properties suitable for soft tissue engineering. Furthermore, the composition can be loaded with therapeutic agents, such as progesterone, to form biodegradable objects capable of sustained, controlled drug release. These properties make the material ideal for medical implants, cardiovascular stents, and drug delivery devices.

This invention provides a biomimetic jellyfish robot and its manufacturing method based on 4D printing, comprising the following steps: Step 1: Establishing the outer shell and tentacles model of the biomimetic jellyfish robot according to the design given in the drawings; Step 2: Creating a printing model using modeling software and exporting the model in .gcode format; Step 3: Drying the PEEK filament before printing, and then loading the PEEK material into the 3D printer; Step 4: Importing the .gcode file from Step 2 into the 3D printer, and using the dried PEEK material from Step 3 to print on the substrate; Step 5: After the model is printed, removing the printed PEEK sample from the substrate; Step 6: Placing the PEEK sample removed in Step 5 in an electrically heated blast oven for constant temperature annealing, and then removing it. This invention significantly saves printing time and material consumption, and replaces manual assembly, thereby reducing labor costs.

The application discloses an electromagnetic wave emission method and a reconfigurable metasurface integrated based on 4D printing, and belongs to the technical field of microwaves. The electromagnetic wave emission method comprises the following steps: obtaining a target voltage; based on the target voltage, controlling the 4D switch to deform towards a target direction, and obtaining an equivalent capacitance corresponding to the 4D switch after deformation; based on the equivalent capacitance, regulating an electromagnetic wave signal and controlling the radiation surface to emit the electromagnetic wave signal. The electromagnetic wave emission method can regulate the electromagnetic wave signal based on the demand voltage, can meet the demand of various application scenarios, reduces the weight and cost of the reconfigurable array antenna, and simplifies the manufacturing process.

The utility model belongs to the technical field of three-dimensional printing, and particularly relates to a preparation device of a metal material for 4D printing, which comprises a square support formed by splicing a plurality of section bars; the lifting pair is arranged on the side wall of the support, the moving end of the lifting pair extends into the support, and a bearing mechanism is arranged at the moving end of the lifting pair; the first translation pair is arranged at the top of the support, the moving end of the first translation pair is suitable for translating in the horizontal plane, and a first spray head is arranged at the moving end of the first translation pair; the second translation pair is arranged on the side wall of the support, the moving end of the second translation pair is suitable for translating in the vertical plane, and a second spray head is arranged at the moving end of the second translation pair; the first spray head is arranged at the moving end of the first translation pair and sprays materials to the bearing mechanism so as to form the part, the second spray head movably arranged on the vertical plane is matched, when the bearing mechanism descends, the materials are sprayed to the side wall of the part, and forming of the complex structure of the side wall of the part is completed.

This application provides a printable shape memory polymer composition for fabricating 4D printed dental orthodontic appliances. The composition comprises a first (meth)acrylate monomer, a second (meth)acrylate monomer providing transient crosslinking for the printable shape memory polymer composition, one or more crosslinking agents, and a photoinitiator, wherein the printable shape memory polymer composition responds to a temperature change at temperature T. g The shape memory polymer composition becomes flexible, allowing it to be printed at temperature T. g The shape is shaped and reshaped. This application also discloses a 4D-printed dental appliance comprising the printable shape memory polymer composition.

The present application relates to the field of additive manufacturing titanium alloy material processing and preparation, and particularly relates to a method for laser 4D printing of titanium nickel hafnium shape memory alloy parts. The method for forming titanium nickel hafnium shape memory alloy parts comprises designing a 4D printing model according to the actual use environment of the parts, and simultaneously selecting titanium nickel hafnium pre-alloy powder with different component proportions; the titanium nickel hafnium shape memory alloy parts are prepared by using the pre-alloy powder through laser 4D printing; the whole part is annealed and then cut to obtain the parts, and the parts are post-processed to obtain intelligent components. The integrated self-controllable medium-temperature intelligent components with good comprehensive mechanical properties can be obtained by using the present application.

The application provides an autonomous deformation skin, comprising a composite lattice microstructure, a connecting sheet, a surface elastomer and a driving motor; the composite lattice structure comprises at least one layer of zero Poisson's ratio lattice structure and at least one layer of corrugated lattice structure arranged alternately in rows; the connecting sheet bridges the lattice structures; the surface elastomer covers the surface of the composite lattice microstructure and the connecting sheet; and the driving motor is fixed to the wing root and driven by power control to drive the skin structure to contract or expand. The autonomous deformation skin is manufactured finely and quickly through "composite lattice structure + shape memory polymer composite stress deformation + 3D printing", and the structure of the deformation skin is driven efficiently through the mode of "piezoelectric driving main driving force + corrugated lattice structure autonomous deformation auxiliary driving force", so that the problem of the internal structure of the skin as a load reducing the driving efficiency is eliminated.

The application provides a 4D printing invisible appliance material based on a shape memory polymer and a preparation method and application thereof, and a 4D printing invisible appliance, and belongs to the technical field of high polymer materials. The 4D printing invisible appliance material is prepared from raw materials including the following components in mass fractions: polyester polyol 100-500 parts, isocyanate 400-800 parts, chain extender 400-800 parts, 1-vinyl-2-pyrrolidone 200-4800 parts, photoinitiator 5-35 parts, and polymerization inhibitor 1-15 parts. The 4D printing invisible appliance material is an invisible appliance material with shape memory performance. The crosslinking structure and hydrogen bond network structure of polyurethane endow the material with excellent shape memory performance. The material can have shape memory response within the oral temperature range, and finally apply slow and long-lasting light force to teeth through shape recovery force, so that the treatment efficiency is greatly improved.

The present invention belongs to the field of additive manufacturing technology, and discloses a 4D printing method capable of in-situ regulating functional properties of nickel-titanium (NiTi) alloys and the application thereof. The method comprises the following steps: subjecting NiTi alloy bars to atomization milling to obtain NiTi alloy powder with a particle size of 15-53 μm, placing the NiTi alloy powder in a discharge plasma assisted ball mill for discharge treatment to promote the activation of powder activity, then adding nano-sized Ni powder with a particle size of 100-800 nm to obtain mixed powder, then continuing the discharge treatment to realize the metallurgical bonding between the NiTi alloy powder and the nano-sized Ni powder to obtain the modified powder, and finally using the additive manufacturing technology to prepare and form the modified powder into a functionalized NiTi alloy. The present invention achieves the metallurgical bonding between the nano-sized Ni powder and the large-sized spherical NiTi alloy powder by adding the nano-sized Ni powder in the process of discharge treatment, which is conducive to preparing a bulk alloy with uniform composition, structure and properties and the parts made therewith.

The invention discloses a quick-response folding unmanned aerial vehicle based on composite material 4D printing. The quick-response folding unmanned aerial vehicle comprises a driving assembly, a folding wing assembly, a supporting and connecting assembly, a power supply assembly and a control assembly. The folding wing assembly is a folding wing manufactured on the basis of composite material 4D printing, the folding wing adopts a shape memory polymer matrix composite material as a base material and is integrally formed through a 4D printing process, and composite material layers with different thermal response characteristics are integrated in the folding wing assembly. Spontaneous folding and unfolding are realized under the stimulation of an external temperature field which is 100 DEG C higher than the glass transition temperature; the driving assembly, the folding wing assembly, the power supply assembly and the control assembly are fixedly installed on the supporting connecting assembly through standard interfaces. According to the invention, the complex terrain operation capability can be greatly improved.

1. Name of the designed product: shoes (4D printing whale shoes). 2. Use of the designed product: shoes for wearing. 3. Design points of the designed product: combination of shape and pattern. 4. Picture or photo that best shows the design points: front view.

A method for improving phase transition temperature of 4D printing high-temperature high-entropy shape memory alloy, comprising the following steps: firstly, forming Ti 25 Zr 12 Hf 13 Ni 25 Cu 18 Co7 high-temperature high-entropy shape memory alloy by using 4D printing technology T S and then heating the printed alloy sample to semi-solid temperature between solidus temperature and liquidus temperature of the alloy T L , keeping warm for 5-15 min, and then rapidly water quenching to obtain semi-solid isothermal heat treatment sample. The preparation method can reduce residual stress of 4D printing forming sample, and prepare high-temperature high-entropy shape memory alloy with high density, few defects and high phase transition temperature.

The application discloses a 4D printing shape memory composite stent for delivering exosomes and magnesium ions and a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing hydroxyapatite and silicon dioxide nanoparticles with poly(D, L-lactic acid-co-trimethylene carbonate) in dichloromethane to obtain an oil phase; adding exosomes into a magnesium oxide nanoparticle water dispersion to obtain an aqueous phase; and mixing to obtain a water-in-oil Pickering emulsion; and (2) using a 4D printing technology to prepare the composite porous shape memory stent (PHS / MgO-EXO) loaded with exosomes by using the Pickering emulsion ink. The stent has a multi-stage interconnected pore structure, and can promote cell osteogenic differentiation and bone tissue regeneration by synergistically releasing exosomes and magnesium ions. The stent also has a temperature-sensitive shape memory function, can restore the original shape under a slightly higher body temperature stimulus, can accurately match irregular bone defects, and is suitable for minimally invasive repair treatment of clinical irregular bone defects.