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Ceramic slurry preparation and 3D (three dimensional) printing light curing molding method
ActiveCN106810215ALow viscosityHigh solid contentAdditive manufacturing apparatusCeramic shaping apparatusFlexural strengthVolumetric Mass Density
The invention provides a ceramic slurry preparation and 3D (three dimensional) printing light curing molding method. 25-85vol% of ceramic powder and 15-75vol% of an optical resin premix solution are mainly involved, and the method includes: A), preparation of the optical resin premix : namely stirring a low polymer, a reactive diluent, a photoinitiator, a dispersing agent, a photosensitizer and a sensitizer according to a certain proportion under intermediate speed for 0.5-3 hours to enable the components to be mixed evenly; B), placing the premix solution and the ceramic powder in a ball mill according to certain volume for ball-milling for 5-15 hours to prepare the ceramic slurry high in solid content and low in viscosity; subjecting the ceramic slurry to curing molding layer by layer gradually on a 3D light curing molding machine to obtain a ceramic green body prior to aftertreatment of drying, degreasing, sintering and the like to obtain ceramic part. The method is high in preparation molding precision and free of molds to prepare complex structure parts, the ceramic product can reach more than 92% in density, 320-1750MPa in flexural strength and 1800-4500MPa in compression strength.
Owner:重庆摩方科技有限公司
Manufacturing method of ink jet head
InactiveUS6139761ADistanceSimple processRecording apparatusSemiconductor/solid-state device manufacturingPressure generationSilicon oxide
A manufacturing method for an ink jet head having an ink ejection pressure generation element for generating energy for ejecting ink, and an ink supply port for supplying the ink to an ink jet head, including the steps of preparing a silicon substrate; forming, on a surface of the silicon substrate, the ink ejection pressure generation element and silicon oxide film or silicon nitride film; forming anti-etching mask for forming an ink supply port on a back side of the silicon substrate; removing silicon on the back side of the silicon substrate at a position corresponding to the ink supply port portion through anisotropic etching; forming an ink ejection portion on a surface of the silicon substrate; and removing the silicon oxide film or silicon nitride film from the surface of the silicon substrate of the ink supply port portion.
Owner:CANON KK
Magnetorheological-material-based 3D (Three-Dimensional) printing type rapid prototyping device and method
The invention relates to a magnetorheological-material-based 3D (Three-Dimensional) printing type rapid prototyping method and device. According to the principle of magnetorheological effect, a magnetorheological material is used as a 3D printing raw material; and a 3D solid model is constructed by spraying the magnetorheological material on a workbench with a magnetic field, rapidly solidifying and prototyping the sprayed magnetorheological material, and then depositing the treated material layer by layer. A computer is provided with three control circuits; one circuit is used for controlling the flow of a driving pump, namely the flow at a spray head; another circuit is used for controlling the 3D motion of the spray head through a servo mechanism; and the rest circuit is used for controlling colour mixing and allocating of a colourized ink box. The magnetorheological material is solidified and prototyped by utilizing the magnetic field generated by an electromagnet. According to the magnetorheological effect of the magnetorheological material, a temperature control module in the traditional melting, spraying and rapid prototyping type 3D printing method is replaced by the magnetic field; in addition, the device disclosed by the invention is also different from a high-pressure electric field required by an electrorheological fluid effect, has the advantages of being simple in structure, low in energy consumption and cost, capable of realizing the microminiaturization and the like, and can be applicable to the fields of process design, art and entertainment, prosthesis model and the like.
Owner:CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
Ceramic material for 3D light curing formation printing and preparation method of ceramic element
InactiveCN109400177AHigh ceramic contentEasy to printAdditive manufacturing apparatusOligomerAgent Combination
The invention relates to a ceramic material for 3D light curing formation printing and a preparation method of a ceramic element. The ceramic material is prepared from 30 to 70 vol percent of ceramicpowder and 30 to 70 vol percent of photosensitive resin premixed liquid, wherein the photosensitive resin premixed liquid is prepared from 37 to 50 weight percent of oligomers, 30 to 60 weight percentof reactive diluents, 0.1 to 5 weight percent of photoinitiators, 1 to 5 weight percent of dispersing agents, 0.1 to 0.6 weight percent of ultraviolet blocking agents, 0 to 0.05 weight percent of polymerization inhibitors, 1 to 4 weight percent of anti-foaming agents, 0.5 to 2.35 weight percent of anti-settling agents and 0.3 to 3 weight percent of leveling agents. In the degreasing and sinteringpost-treatment work procedures, specific parameters are used, so that a sintering element can reach good sintering density and mechanical performance. By optimizing the composition and the proportionof light curing ceramic resin, and selecting the excellent dispersing agent combination and the reasonable consumption, the ceramic powder can be better dispersed in the resin; the problems that theexisting light curing ceramic resin has poor flowability and low formation precision, and that a finally prepared ceramic product can easily generate cracks or deformation, and the like are solved.
Owner:西安点云生物科技有限公司
Electric contact and an electric connector both using resin solder and a method of connecting them to a printed circuit board
InactiveUS6717065B2Increase the cross-sectional areaGreat freedomTwo pole connectionsContact member assembly/disassemblyElectrical conductorEngineering
An electric contact using resin solder is connected to a printed circuit board, which has a conductor provided on a surface thereof. This electric contact comprises a leg, which contacts the conductor of the printed circuit board, and a connecting part, which is connected to the conductor of the counterpart member. At least a part of the leg, which contacts the conductor of the printed circuit board, is made of a lead-free ultrahigh-conductive plastic being a conductive resin composite. An electric connector includes the electric contact and an insulating housing, which holds the electric contact so that the part of the leg, which contacts the conductor of the printed circuit board, is exposed.
Owner:JST MFG CO LTD
Wiring base board, method of producing thereof, and electronic device
ActiveUS20050247482A1Multilayer structure increaseImprove signal transmission reliabilityPrinted circuit aspectsElectrical connection printed elementsDifferential transmissionEngineering
A wiring base board and a method of producing thereof relate to a wiring base board of a multilayer structure, and make it possible to perform various kinds of transmission modes such as differential transmission at via parts. For this wiring base board, an insulating substrate is used. The wiring base board has a first via hole part which is formed in the insulating substrate and provides a plurality of circumferential face parts, and a plurality of second via hole parts, forming concentric circles with the circumferential face parts, which are formed in the first via hole part through an insulator. By this, a differential wiring structure and coaxial structure parts are constituted.
Owner:FUJITSU LTD
Fused deposition three dimensional printing nozzle and printer
The invention discloses a fused deposition three dimensional printing nozzle and a printer. The fused deposition three dimensional printing nozzle comprises a screw machine barrel, a nozzle and screw shaft, wherein the nozzle is arranged at the lower portion of the screw machine barrel, the screw shaft is arranged in the screw machine barrel, the upper end of the screw shaft is connected with a motor shaft through a shaft coupling, the lower half segment of the screw shaft is provided with a thread slot, the upper portion of the barrel body of the screw machine body is provided with branch tubes used for mounting fed filament plasticizing tubes, and the periphery of the screw machine barrel and the branch tubes is provided with heaters. The screw machine barrel is used as a filament fusion and mixing container, the plasticizing tubes arranged in the branch tubes are used as filament inlets, the heaters are used to heat filaments in the plasticizing tubes and the screw machine barrel in order to fuse the filaments, and driving force is generated through screw rotation in order to stir and mix the fused filaments entering the screw machine barrel, push the mixed filaments into the nozzle and realize extrusion molding, so the filaments can be effectively fused and extruded.
Owner:HUAZHONG UNIV OF SCI & TECH
Laser material increasing and decreasing combined manufacturing method and device
InactiveCN105538728AHigh forming precisionGood compatibilityAdditive manufacturing apparatusIncreasing energy efficiencyLaser scanningControl aspects
Owner:CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
Method for producing a composite metal product
A low melting point metal material is made to a thixotropic state in which liquid phases and solid phases coexists. In the thixotropic state of the low melting point metal material, a carbon nano material is kneaded with the low melting point metal material and forms a composite material. Thus obtained composite material is supplied to a metal molding machine and injected into a mold in a thixotropic state or a completely molten state of the metal so that the composite material fills the mold, thereby the composite material is molded to a composite metal product. With the above process, it is possible to injection mold the composite metal product to which the characteristics of the carbon nano material are applied.
Owner:NISSEI PLASTIC IND CO LTD
Deposition mask, producing method therefor and forming method for thin film pattern
ActiveUS20140199808A1Enhance form accuracyHigh forming precisionDecorative surface effectsSpraying apparatusOptoelectronics
Owner:V TECH CO LTD
Melt differential three-dimensional printer
ActiveCN103692653ABurn out preventionConvenient Quantitative ManagementManufacturing driving meansAdditive manufacturing with liquidsHot runnerMotor drive
The invention discloses a melt differential three-dimensional printer. The melt differential three-dimensional printer mainly comprises a material melting unit, a micro-droplet jetting unit, a cylindrical-coordinate system molding unit and a rack, wherein a servo motor drives a screw rod to rotate in the material melting unit; a heater, which is fixedly arranged inside a machine cylinder, ensures that granules are entirely plastified through temperature regulation; a molten material is transmitted by the screw rod to the micro-droplet jetting unit; in the micro-droplet jetting unit, the molten material is transmitted into a valve body through a hot runner in a runner plate; a linear servo motor drives a valve needle to do reciprocating motion in the valve body so as to quantitatively and intermittently squeeze the molten material out of a nozzle to form melt micro-droplets; in the cylindrical-coordinate system molding unit, the molten micro-droplets are injected to a bearing table for cooling and deposition molding; the servo motors in the left-right direction and in the vertical direction are respectively engaged with the corresponding screw rod to rotate so as to drive the material melting unit and the micro-droplet jetting unit to move along the left-right direction and the vertical direction; a circumference servo motor drives the bearing table with a worm gear to rotate through a worm rod so as to realize three-dimensional movement under a cylindrical-coordinate system.
Owner:BEIJING UNIV OF CHEM TECH
Electromagnetic inching forming method and its device for plate moving coil
InactiveCN1821910AGood repeatabilityEasy energy control and automated productionProgramme controlComputer controlEngineeringElectromagnetic pulse
This invention relates to an electromagnetic progressive shaping method for plate moving coils and a device, in which, said device includes a computer control system, an electromagnetic force generation system and a three-shaft digital control shaping system including a plate clamping elevating device, a supporting model frame and an electromagnetic shaping clamping rod, in which, the computer controls the coil to move downward along the contour of a model profile from the top according to the contour data of the model profile and the plate is formed partly relying on the magnetic force of coil till to the bottom of the model and finish the entire process.
Owner:HUAZHONG UNIV OF SCI & TECH
Molding method of components of heterogeneous materials
InactiveCN101561674AHigh strengthGood removal effectProgramme controlComputer controlDiscretizationDigital control
The invention discloses a molding method of components of heterogeneous materials, comprising the following steps of: establishing a CAD model of a three-dimensional body, carrying out variegation on the CAD model, then carrying out discretization slicing delamination to obtain a series of two-dimensional slices with material information and structure information, converting the structure information of each slice into corresponding digital control processing programs, realizing precise accumulation of molding materials of each separated layer by digital control motion and opening and closing of a nozzle, accomplishing microdrop accumulation of the material of the layer according the above method under the control of control processing program of corresponding layer; spraying propping materials for padding, as propping, in areas of each layer which are not sprayed; bonding and overlaying layer by layer to produce the designed three-dimensional body finally; removing padded propping materials of each layer to obtain three-dimensional molded parts containing heterogeneous materials corresponding to computer solid models. The invention can produce heterogeneous materials and functional components with high molding precision and strength quickly, the process is simple, the production cost is low, and the choice of materials is wide.
Owner:NANJING NORMAL UNIVERSITY
Synchronous powder feeding space laser machining and three-dimensional forming method and device
ActiveCN104190927APrecise couplingWon't flowAdditive manufacturing apparatusIncreasing energy efficiencySynchronous motorComputer module
The invention discloses a synchronous powder feeding space laser machining and three-dimensional forming method and device. A three-dimensional solid is divided into a plurality of forming units according to the form simplification and nozzle fusion covering scanning accessibility principle, each forming unit is divided into a plurality of laminates, a mode for single-beam gas-carried powder feeding in a hollow annular laser is adopted, a mechanical arm is controlled to drive an in-laser powder feeding nozzle to move for scanning in filling areas and boundary areas of the laminates according to a preset trajectory, and forming fusion covering and stacking forming of the laminates are sequentially completed, so that forming fusion covering and stacking forming of the whole unit are completed. The device comprises the in-laser powder feeding nozzle, a laser generator, the mechanical arm, a control module, a transmission optical fiber, a gas-carried powder feeder and a gas source. The control module is connected with the mechanical arm, the laser generator and the gas-carried powder feeder. The in-laser powder feeding nozzle is fixed to the front end of the mechanical arm and can make spatial motion along with the mechanical arm. Through the method and device, fusion covering and three-dimensional stacking forming on any surface of the space can be achieved, and supportless three-dimensional forming of parts with complex structures such as a hanging structure and a cavity can be achieved.
Owner:SUZHOU UNIV
High precision spinning forming method for thin wall closing head with radius-thickness ratio less than three per mille
The invention relates to a thin-walled closure head high accuracy spinning forming method. The invention is to resolve the problem of big size closure head, thin wall thickness, high accuracy size and high difficulty of forming. Spinning machine is started to make rolling wheel do axial and circumferential movement along track loaded into program in head while spinning, meanwhile main axle of spinning machine drives core and bar plate to spin. When rolling wheel rolls to the distance of 20mm from edge it quits. The invention has the advantages of simple process and high accurate product.
Owner:HARBIN INST OF TECH
Method for preparing integrated frame fabrication of cartilage of tissue-engineered bone having function interface
InactiveCN101032430AAchieve mechanical strengthGood biocompatibilityBone implantCartilage cellsOsteoblast adhesion
The present invention discloses process of preparing integral bionic tissue engineering bone-cartilage rack with functional interface. The process includes the first establishment of CAD model of the integral bone-cartilage rack by means of bionic principle; preparing collagen / chitosan and collagen / hydroxyapatite micro polymer powder; converting the CAD model into fast forming file input into a 3D printing fast forming machine, spreading the powder with one powder spreader, spraying pentanedial adhesive selectively on the spread powder for adhering and eliminating excessive powder to obtain the integral bionic tissue engineering bone-cartilage rack with functional interface. The present invention has excellent biocompatibility, controllable cartilage rack degrading speed and mechanical strength and other advantages.
Owner:THE FIRST AFFILIATED HOSPITAL OF THIRD MILITARY MEDICAL UNIVERSITY OF PLA
Stretch-forming and electromagnetic combining incremental forming method and device of large thin-wall part
The invention discloses a stretch-forming and electromagnetic combining incremental forming method and device of a large thin-wall part. The method comprises the steps that a driving plate is arranged above a plate to be deformed, the driving plate and the plate to be deformed are clamped by a pressing plate and a supporting plate, and a lifting oil cylinder drives the supporting plate to move, so that the driving plate and the plate to be deformed are stretch-bent and tightened preliminarily, and the stretch-forming process is achieved; the position of an electromagnetic coil is adjusted, the electromagnetic coil is made to exactly face the driving plate to be deformed to discharge electricity, the coil rotates on the surface of the driving plate for a circle around the axis of a male die, and the plate to be deformed is attached to the male die at the same height; then, the oil cylinder descends again to stretch-bend the plate, the coil discharges electricity to deform the plate to be deformed again, the plate to be deformed is attached to the male die, and the alternate forming process of stretch-forming, discharging, re-stretch-forming and re-discharging of the plate is achieved in the same way till deformation of the plate is finished. The flowing evenness of materials can be improved, the thinning ratio of the plate can be reduced, and flexible processing and precise plastic manufacturing of large plates hard to deform can be achieved.
Owner:HUAZHONG UNIV OF SCI & TECH
Preparation method of SiCf/SiC ceramic matrix composite turbine blades
InactiveCN103113123AMeet preparation requirementsImprove silicon corrosion resistanceYarnStress distribution
The invention discloses a preparation method of SiCf / SiC ceramic matrix composite turbine blades, which is characterized in that through analyzing the stress distribution of a blade in an application state, based on this point, a performance-controllable SiCf / SiC ceramic matrix composite turbine blade is manufactured through the designing and adopting of processes such as rapid forming, high-performance continuous yarn braiding, gel-casting, reactive sintering, and the like. According to the method, parts such as blades and the like are manufactured by using heterogeneous materials, the contradiction between the uniformity and nonuniform loaded structure of materials is solved, and the performances of materials can be set flexibly according to the bearing needs of manufactured parts; and prepared SiCf / SiC ceramic matrix composite turbine blades have the characteristics of near-net forming variable-cross-section complex structure, controllable material performance, flexible machining, short production cycle, low cost, and the like, and can be applied to the development and manufacturing of high-temperature-resistant complex structured parts for aerospace and the like.
Owner:XI AN JIAOTONG UNIV
Semiconductor device and fabrication method for the same
ActiveUS20090108379A1Low resistance of wireImprove accuracySemiconductor/solid-state device detailsSolid-state devicesSemiconductorSemiconductor device
The semiconductor device includes: a transistor having a gate electrode formed on a semiconductor substrate and first and second source / drain regions formed in portions of the semiconductor substrate on both sides of the gate electrode; a gate interconnect formed at a position opposite to the gate electrode with respect to the first source / drain region; and a first silicon-germanium layer formed on the first source / drain region to protrude above the top surface of the semiconductor substrate. The gate interconnect and the first source / drain region are connected via a local interconnect structure that includes the first silicon-germanium layer.
Owner:PANNOVA SEMIC
Laser fast forming detection system and method for powder laying evenness
ActiveCN106041076AReal-time monitoring of contour sizeHigh forming precisionAdditive manufacturing apparatusMaterial analysis by optical meansControl systemOptoelectronics
The invention relates to a laser fast forming detection system and method for powder laying evenness and belongs to the technical field of laser fast forming powder laying detection. The laser fast forming detection system and method for powder laying evenness are provided and can monitor whether powder is laid flatly or not in real time and effectively improve the forming quality. According to the adopted technical scheme, a powder laying device, a powder supplying cylinder, a forming cylinder and a material collecting cylinder are arranged in a forming cavity; a laser device and an image collecting device are arranged on the top of the forming cavity; light supplementing lamps are arranged on the two sides of the forming cavity; and the laser device, the image collecting device and the light supplementing lamps are connected with the control system. The laser fast forming detection system and method for powder laying evenness can be widely applied to powder laying evenness detection for laser fast forming.
Owner:山西阳宸中北科技有限公司
Multi-material laser direct writing conformal system and method
InactiveCN104260360ALarge adjustment rangeHigh repeat positioning accuracyMulti materialControl system
The invention discloses a multi-material laser direct writing conformal system and a method. The system comprises a vacuum seal case, a multi-joint mechanical arm, a multi-material laser direct writing head and a control system for controlling the constituent parts, wherein the mechanical arm and the laser direct writing head are arranged in the vacuum seal case; the laser direct writing head comprises a direct writing head body, a laser and at least two groups of material cylinders; a material channel and a laser focusing channel communicated with the laser and the material cylinders respectively are arranged on the direct writing head body; and the at least two groups of material cylinders are arranged on the direct writing head body in parallel. A particular process is as follows: the mechanical arm drives a workpiece to move along a set path; a material controller selects the corresponding material cylinders; a discharge head delivers and allows materials to be attached to the surface of the workpiece; and at the same time, laser light emitted from the laser focusing channel carries out solidifying or sintering forming on the attached materials. According to the invention, a control process is simple, the forming precision is high, continuous production is achieved, and production efficiency is improved.
Owner:CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
Compound rapid forming method and device by integration of light solidification and fusion sediment
This invention relates to integrate composite quickspeed forming method composed light solidifying forming method and fusion sedimentation and devices. Form outer fine contour with light solidifying forming method and inner block zone. The device comprises corresponding two systems and form-head auto switching system controlled by microcomputer control system. This invention integrates advances of two quickspeed forming methods and overcomes their shortcomings; the former has high forming precision, strong preparation details capability and well surface quality; the latter fits to large range materials and needs low cost. It fits to many members precision preparation.
Owner:SHANGHAI UNIV
Electromagnetic forming device and method for micro fuel cell metal bipolar plate microchannel
The invention discloses an electromagnetic forming device and an electromagnetic forming method for a micro fuel cell metal bipolar plate microchannel, and relates to a micro fuel cell metal bipolar plate microchannel forming device and a micro fuel cell metal bipolar plate microchannel forming method so as to solve the problem of matching difficulty between micro male and female dies in the process of forming a microstructure on a metal thin plate based on stamping and other conventional plastic deformation means. The device comprises an upper template, a coil, a driving sheet, a die, a lower template and a fastening bolt; a groove is formed on the surface of a supporting frame so as to accommodate the coil; a circular through hole is formed in the center of the bottom of the groove so as to accommodate the die; the driving sheet is arranged above the die; and an axial lead of the coil is in upper and lower directions. The method comprises the following steps of: discharging to the coil to excite a strong pulsed magnetic field; generating induced eddy on the surface of the driving sheet so as to generate a magnetic field opposite to the magnetic field of the coil in the transient strong pulsed magnetic field; and driving a plate blank to make die attaching motion by using the driving sheet under repellent applied force between the magnetic fields. The invention is used for micro-forming.
Owner:HARBIN INST OF TECH
Material for formation of resist protection film and method of forming resist pattern therewith
InactiveUS7879529B2Improve featuresHighly accurate resistOrganic chemistryPhotosensitive materialsLithography processAcrylic resin
In the liquid immersion lithography process, by simultaneously preventing deterioration of a resist film and deterioration of an immersion liquid employed during liquid immersion lithography which uses various immersion liquids, including water, resistance to post exposure delay of the resist film can be improved without increasing the number of processes, thereby making it possible to form a high resolution resist pattern using liquid immersion lithography. Furthermore, it is possible to apply a high refractive index liquid immersion medium, used in combination with the high refractive index liquid immersion medium, thus making it possible to further improve pattern accuracy. Using a composition comprising an acrylic resin component having characteristics which have substantially no compatibility with a liquid in which a resist film is immersed, particularly water, and are also soluble in alkaline, a protective film is formed on the surface of a resist film used.
Owner:TOKYO OHKA KOGYO CO LTD
Polyamide material and its preparing process
The invention discloses a polyamide material and making method, which comprises the following parts: 45-65% PA, 10-40% glass fiber, 2-10% compatible flexibilizer, 5-25% mineral fill, 0.2-2% antioxidant and 0.1-2% heat stabilizer. The making method comprises the following steps: weighing raw material; disposing the surface of glass fiber through gamma-amphotaethoxy silane; blending polyamide, compatible flexibilizer, heat stabilizer, anti-oxidant and mineral fill in the high-speed blender for 1-4min; placing glass fiber and mixed raw material in the double-screw squeezer to mix; fusing; squeezing; graining.
Owner:SHENZHEN KEJU NEW MATERIAL
3D (3-dimensional) multifunctional color food printing equipment
InactiveCN105196553AHigh forming precisionHigh speedAdditive manufacturing apparatusFood coatingControl systemSpray nozzle
The invention relates to 3D (3-dimensional) multifunctional color food printing equipment. The equipment is shown as figure 1, and the working principle of the equipment is basically the same as that of a conventional 3D printer. Besides dynamic three-dimensional accurate positioning in X, Y and Z directions, a printing system comprises three spray nozzles, three dosing pumps provided with servo motors, three containers and a conveying pipe, wherein the spray nozzles adopt a circumferential uniform distribution structure and realize printing of three colors or objects through a control system. The equipment further has the advantages that a touch control screen and templates are arranged in a printer, a larger model base is established in the printer, so that various food prototypes can be printed rapidly and conveniently, or food with irregular animal forms is printed through combined templates, human dimensional imagination and creativity can be particularly stimulated, and green delicious food is made with own hands. The forming precision is higher, the speed is high, the technology is simple, the cost is low, and the equipment can be widely applied to the field of catering industry, the family field and the teaching field.
Owner:WEINAN DINGXIN INNOVATION ZHIZAO TECH CO LTD
Automotive interior component and method for manufacturing the same
InactiveUS20060222841A1Reduce molded loadReduce in quantitySynthetic resin layered productsVehicle componentsDecrease weightMechanical engineering
Owner:KASAKI IND
Device and method for processing polymer film surface microstructure based on roll-to-roll hot rolling
The invention relates to device and method for processing a polymer film surface microstructure based on roll-to-roll hot rolling. The method comprises the following six steps: unrolling, pre-heating, hot-rolling, conforming, cooling and rolling. The unrolling step includes continuously drawing a polymer film from a rolled material and removing static electricity on the surface of the film. After the pre-heating step, the polymer film is heated to a temperature below the glass transition temperature thereof to get ready for the hot-rolling step. The local heating treatment is conducted on a plate roller to allow only the temperature of the stamping surface to rise above the glass transition temperature, so as to roll-form the preheated film. The conforming step enables the rolled film in close contact with the surface of the plate roller, so that the film is completely deformed. The formed film is subjected to both cooling and conforming to cause rapid curing of the surface microstructure and reduce rebound. Compared with the prior art, the device and method have the advantages of reducing the risk of rebound and deformation, improving the forming precision of the microstructure, making demoulding easier and increasing the processing efficiency.
Owner:SHANGHAI JIAO TONG UNIV
Flexible stretch-forming device and method for carrying out stretch-forming on plate by utilizing same
InactiveCN103480713AReduce deformation resistanceHigh forming precisionShaping toolsIndustrial machineIndustrial manipulator
The invention discloses a flexible stretch-forming device and a method for carrying out stretch-forming on a plate by utilizing the flexible stretch-forming device and solves the technical problem that the stretch-forming accuracy of a flexible stretch-forming device for the molded surface of a reconfigurable unidirectional continuous die is low. The technical scheme includes that the flexible stretch-forming device comprises an industrial manipulator, a heating forming head, a power supply, a multipoint die, a nail post and a polyurethane elastic cushion. The nail post is mounted on the base of the multipoint die, the polyurethane elastic cushion is positioned above the nail post, the lower surface of the polyurethane elastic cushion is attached to the discrete surface formed by the nail head of the nail post, the plate is positioned above the polyurethane elastic cushion, the lower surface of the plate is attached to the upper surface of the polyurethane elastic cushion, the heating forming head is positioned above the plate, and the spherical head surface of the heating forming head is contacted with the upper surface of the plate. According to the flexible stretch-forming device and the method for carrying out stretch-forming on the plate by utilizing the flexible stretch-forming device, the electromagnetic induction heating forming head is adopted to locally heat the plate in the stretch-forming process, the local heat effect of the region can reduce the deformation resistance of the plate, the plasticity is improved, the resilience value is reduced, and the forming accuracy of the plate is improved.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Laser power regulating method based on model features
InactiveCN107599382ASmall amount of calculationEasy to operateAdditive manufacturing apparatus3D object support structuresClassical mechanicsLaser additive manufacturing
The invention belongs to the technical field of laser material additive manufacturing, and particularly relates to a laser power regulating method based on model features. The laser power regulating method comprises the following steps that a special region with a complex structure in a model is obtained, slicing processing is conducted on the workpiece model, and preprocessing is conducted on thesplice contour of a special region in the contour data of each layer, the laser power of the point needed to be adjusted is calculated point-by-point; and the slice contour of a non-special region ineach layer contour data is filled in a conventional filling mode; and the process is repeated until layer processing of all slices of the workpiece model is finished, and finally the laser printing path data of the workpiece model is generated. According to the laser power regulating method based on the model features, the heat accumulation effect generated by excessively intensive scanning and printing of in the local region of the laser is utilized, and the laser power of the progressive contour ring filling path in the region is adjusted dynamically, so that adverse effects caused by the heat accumulation effect is avoided, and the fact that the temperature of a material molten pool is stable in the melting temperature range of powder materials all the time is guaranteed.
Owner:HUAZHONG UNIV OF SCI & TECH
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