359results about How to "High forming precision" patented technology

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.

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.

The invention discloses a laser material increasing and decreasing combined manufacturing method and device. Specifically, the method comprises the steps that a geometric model of an entity part is established, a scanning path of a laser for quick laser forming in a selected area is planned, and a scanning path of a laser for laser material decreasing manufacturing is planned; a forming cavity is vacuumized and filled with protection gas; a layer of powder is laid in a forming area through a powder spreading system; laid materials to be formed are scanned through the laser for quick laser forming in the selected area, and structure forming is carried out; the contour edge of the formed structure is scanned by the pulse laser for laser material decreasing manufacturing along the planned path to remove coarse parts on the surface; the operation of powder spreading, quick laser forming in the selected area and laser material decreasing manufacturing is repeated until a final three-dimensional entity part is obtained. The invention further provides the laser material increasing and decreasing combined manufacturing device. By using the device and the method for manufacturing increased and decreased materials, the forming precision is improved; in addition, the laser is used for both increasing and decreasing the materials, so that better compatibility is achieved, and control is easier.

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.

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.

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.

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.

The invention discloses additive manufacturing and subtractive manufacturing combination based integrated forming equipment for bionic structures and belongs to the technical field of tissue engineering. The additive manufacturing and subtractive manufacturing combination based integrated forming equipment mainly comprises a case, a support, a multi-nozzle spraying device, a subtractive manufacturing mechanism, a forming table, a temperature control and cooling device, a three-dimension motion mechanism, a feed box and a control system. A composite processing device utilizing combination of nozzle extrusion molding and subtractive manufacturing is adopted; through vertical moving of the multi-nozzle spraying device and rotary deflection motion of the forming table, the nozzles can compete extrusion molding individually; further, by subtractive manufacturing means such as milling, drilling, boring, grinding and tapping, efficient stacking integrated forming and after-processing of the bionic structures under cooperation of multi-nozzle molding and subtractive manufacturing finishing machining are realized.

The invention discloses a forming method and device for a thin-wall T-pipe. The forming method comprises the steps that an elastic core bar which is high-voltage resistant and good in mechanical property is adopted as an expanding medium; a pipe blank filled with the elastic medium is arranged in a mould; acting forces are applied onto the two ends of the pipe blank by horizontal punches; and an extrusion expanding force is generated. The forming method has the advantages that a technology and the mould are both relatively simple; the expanding force is distributed uniformly basically; in addition, after an external force is removed, the elastic medium can recover to the original shape, and can be taken out of a manufactured product conveniently; the production is convenient; the forming precision is high; the processing of parts in complicated shapes is facilitated; and the thin-wall T-pipe has better mechanical properties.

An electric spark and electrolysis combined milling machining method of a micro three-dimensional structure belongs to the technical field of micromachining, and is characterized in that a plurality of metal alloy material and complicated cavities and surfaces can be machined through adopting simple electrodes to operate the combined machining of micro electric spark milling and micro electrolysis milling by means of the layered milling principles. The combined machining method has two steps of fast finishing the most of machining through adopting the machining method of the micro electric spark closed-loop gap servo scanning and milling, then carrying out the residual machining through adopting the machining method of the micro electrolysis layered open-loop digital control scanning and milling, thereby finally finishing the shaping of a micro three-dimensional structure, wherein a machining electrode whose side wall is insulated is used in the electrolysis milling for improving the machining localization and machining precision. The method fully utilizes the advantages that the micro electric spark servo scanning and milling has fast machining speed, and the micro electrolysis digital control milling can not abrade the machining electrode, and has excellent surface machining quality.

The invention relates to a manufacturing method of a complex-structured intelligent material device based on a rapid forming technique. The manufacturing method comprises the following steps: determining the utilized rapid forming technique according to one or multiple requirements including the physicochemical properties and states of a forming raw material and the precision of the complex-structured intelligent material device; establishing a three-dimensional model of the complex-structured intelligent material device, carrying out discretization on the surface of the three-dimensional model of the complex-structured intelligent material device to generate a three-dimensional digital model file of the three-dimensional model of the complex-structured intelligent material device, carrying out support adding, layered model discretization and processing route generation on the three-dimensional digital model file to guide out a processing file capable of being identified by rapid forming equipment, and downloading the processing file to the rapid forming equipment; manufacturing the complex-structured intelligent material device by virtue of the rapid forming equipment according to the processing file. According to the manufacturing method, the problem that different types of the complex-structured intelligent material devices are difficult to manufacture is solved; a forming device has the advantages of high precision, adjustable performance, easiness in manufacturing and the like.

The invention provides a magnetic field control type electric arc robot additive manufacturing method. The method includes the steps that an excitation power supply is switched on, a welding gun movesto an arcing point according to a set program to conduct arcing, a welding robot moves according to a preset track, a longitudinal magnetic field is applied to the end portion of the welding gun, molten welding wires are stacked at an assigned position, and a control system controls a wire feeding mechanism to convey the welding wires into a melting area according to the assigned speed at the same time; the welding gun is elevated by one floor height in the height direction, and melting and stacking of the next layer are conducted; and depositing and piling of workpieces are completed. According to the magnetic field control type electric arc robot additive manufacturing method, by means of the external longitudinal magnetic field, the electric arc form is changed, the molten drop fallingprocess is controlled and the shape of a molten pool is constrained, and the forming precision is improved; and meanwhile, the externally-added longitudinal magnetic field has a stirring effect for the molten pool, elements of the molten pool can be uniform, and crystalline grains can be refined. The forming precision and quality of added components are improved.

The invention discloses a heliostat through glass micro-arc mirror shaping technique in the solar utilizing technical domain, which is composed of curved mirror composite adjusting device and a group of single-chip glass micro-arc curved mirror shaping adjusting device, wherein the glass mirror rack of the single-chip glass micro-arc curved mirror shaping adjusting device is connected with the glass mirror through three groups of adjustable connecting devices at two ends or in the middle; two ends of each single-chip glass micro-arc curved mirror shaping adjusting device are fixed on the main frame of the curved mirror composite adjusting device through at least two groups of locking fixing piece, which are arranged adjacently; the incidence adjusting device is loaded near two groups of locking fixing piece adjacent to the main frame.

The invention discloses a multi-point male die liquid-filling drawing forming device and a multi-point male die liquid-filling drawing forming method for a plate, relates to a device and a method for forming thin-walled curved plate parts, and aims to solve the problem of difficulty in forming of thin-walled and deep-cavity parts with complicated curved surfaces. A plurality of small punches are independently arranged; the upper ends of the small punches penetrate into through holes in a male die body; the upper end of each small punch is connected with a linear driving device; a female die is a semi-closed cavity of which the upper end is opened and the lower end is closed; an elastic base plate and a metal protection plate are superposed on the upper end surface of the female die from bottom to top. The heights of the small punches are adjusted to realize the construction of an outer contour of a multi-point male die; a to-be-formed plate blank, the elastic base plate and the metal protection plate are sequentially arranged on the upper end surface of the female die; a blank holder moves down to be assembled with the female die, and the multi-point male die moves down and applies a drawing force to the to-be-formed plate blank; meanwhile, a liquid medium is filled into an inner cavity of the female by the aid of a pressurizing system until drawing is completed to obtain parts of a required shape. The device and the method are used for forming the plate, and the thin-walled and deep-cavity parts with the complicated curved surfaces can be formed.

The invention discloses a micro-nano three-dimensional printing nozzle device. The three-dimensional printing nozzle device comprises a controller, a storage bin and a nozzle main body part. The nozzle main body part comprises three groups of spray orifice arrays with different diameters, and the spray orifice arrays are respectively an A group spray orifice array, a B group spray orifice array and a C group spray orifice array. The three groups of the spray orifice arrays with the different diameters are connected to three nozzles respectively. The controller comprises a central processing unit, a controller for the first spray orifice array, a controller for the second spray orifice array, a controller for the third spray orifice array and a driving power source. The central processing unit controls and switches working of the controller for the first spray orifice array, the controller for the second spray orifice array and the controller for the third spray orifice array by outputting different pulse signals. The controller for the first spray orifice array, the controller for the second spray orifice array and the controller for the third spray orifice array respectively control a working state of each spray orifice in each of the three groups of the spray orifice arrays with the different diameters. According to the three-dimensional printing nozzle device, rapid rough machining is performed by utilization of the work of the large-diameter spray orifices and slow finish machining is performed by utilization of small-diameter spray orifices, thus achieving macro-micro composited three-dimensional rapid moulding.

The invention discloses a method for machining an all-metal screw pump stator. The method comprises the following steps of: 1) machining a stator blank, so that a central hole for forming a stator inner cavity is formed in the stator blank; 2) forming the stator inner cavity by an electrolytic process; 3) polishing the stator inner cavity; and 4) performing surface-hardening treatment on the stator inner cavity. According to the method, the problem of difficulty in machining of the all-metal screw pump stator is solved by combining polishing treatment and surface-hardening treatment by adopting the electrolytic process. The method has obvious advantages on the machining of materials which are difficult to machine and parts with complex shapes or thin-wall parts, and has the characteristics of wide range of the machined materials, high production efficiency, high forming accuracy, capability of recycling electrode assemblies and the like. By the method, the technical blockade of hydraulically-formed all-metal screw pump stators which are used abroad is broken through, and a new method for manufacturing the all-metal screw pump stator is opened up, so that the machining difficulty of the all-metal screw pump stator is reduced effectively, and the machining efficiency is improved.

The invention provides a method for manufacturing a large-curvature aluminum alloy integral wall board component. The method includes the steps that A, solution hardening is conducted on a wall board; B, the wall board obtained in the step A is arranged in a sealed environment formed by a thin film covering layer and a forming die jointly, the wall board is elastically deformed and plastically deformed in sequence under the vacuumized condition, and then the deformed wall board is obtained, wherein the temperature in the sealed environment where the wall board is located ranges from 15 DEG C to 35 DEG C, the vacuum degree ranges from -0.1 MPa to -0.05 MPa, and the treatment time ranges from 5 min to 60 min; C, in-situ creep stress relaxation aging is conducted on the deformed wall board obtained in the step B, wherein creep stress relaxation aging time is more than 2 h; D, unloading operation is conducted, and then the large-curvature aluminum alloy integral wall board component is obtained. When the method is used for manufacturing the large-curvature aluminum alloy integral wall board component, the residual stress of the product is greatly reduced, the strength of the product is improved, and the product with high forming accuracy and good performance is obtained.

The invention relates to hydrodynamic deep drawing equipment for forming deep cavity parts, which is capable of deep drawing the deep cavity parts with complicated shapes such as necking-type parts with negative draft angles. The equipment is formed by three parts, i.e. a host machine, a hydraulic control system and an automatic control system of a computer. The host machine is a hydraulic machine with three beams and four columns; the hydraulic control system provides motion power to the host machine and mainly comprises two main loops, i.e. a side pressing control loop and a charging chamber control loop; and the automatic control system of the computer is used for collecting data of a displacement sensor and a pressure sensor in real time, accurately controlling and recording formed parameters, and also accurately controlling pressure according to a set curve. The equipment provided by the invention can be used for forming the parts which cannot be formed by a traditional forming process or can be formed only by a plurality of processes; has the advantages of high forming accuracy, good surface quality of the parts, high die fitting degree and the like; and has the characteristics of simplicity and convenience in operation, high control accuracy, high universality, high automation degree and the like.

The invention is a method for improving sheet metal laser hot-bending forming precision. A forming workpiece is fixed on a three-dimensional numerical control platform, continuous laser beams heat the surface of sheet metal along given motion track at a certain scanning speed, different pressures are applied at the distance of about 1 to3 facula diameters behind the laser beams, smaller pressure is applied at the position of greater bending angle, greater pressure is applied at the position of smaller bending angle, so as to reduce the change of bending angle along the heated sheet formed sheet and improving the forming precision of the forming workpiece. The method is applied to high-rigidness and fragility difficultly-deformed sheet high-precision forming, and has broader application prospect in the fields of aerospace, medicine and microelectronics.

The invention discloses a preparing method of SiCp/Al composite with complete shape and high analytic in metal base composite material researching domain, which comprises the following steps: allocating pre-mixing liquid with monomer, cross linker and disperser; adding into SiC powder; balling; getting stable suspension with SiC volume content at 50-70%; adding into trigger and activator; stirring evenly; injecting into unapertured mold; solidifying and shaping in incubator with temperature at 50-70 deg.c; getting green compact; drying; discharging glue; presintering; getting SiC bone; placing Al alloy of 4-8% Mg, 6-12% Si on the adaptive position of bone; putting into heater; heating-up at 900-1200 deg.c under the protection of inert gas; inflating high pure nitrogen; keeping the temperature at 1-6 h; cooling; getting the product. This invention possesses the merit of cheap cost.

The present invention belongs to the field of hydraulic machinery, and is one hydraulic press specially for bending and upsetting crankshaft. Technologically, the hydraulic press features the energizing arm levers installed symmetrically below sides of the movable cross beam, swinging block type mold locking devices installed symmetrically on two sides of the upper and the lower bending molds, and the hollow plungers inside the movable cylinders installed oppositely below the movable work table. The hydraulic press may upset smooth rod directly and has high shaping precision, less allowance, simplified forging process, saving in noble metal material, short machining period and other advantages.

The invention discloses spinning part support type corrugated pipe spinning equipment which comprises a mandrel (2) connected onto a spinning machine spindle (1), wherein a press block (6) is arranged on a large-diameter section (3) of the mandrel (2); a small-diameter section (4) of the mandrel (2) is sleeved with a corrugated die (5); the press block (6) is tightly pressed on the outer surface of the corrugated die (5); a locking nut (7) at the tail end of the mandrel (2) is used for fixing the corrugated die (5); and the tail end of the mandrel (2) is tightly pressed and supported by a spring guide (9). The invention further discloses a corrugated pipe forming method adopting the equipment. The spinning part support type corrugated pipe spinning equipment and the corrugated pipe forming method adopting the equipment have the benefits as follows: the equipment is simple in structure and reasonable in design, the corrugation processing accuracy is high, the deformation defect of a pipe during the forming process is effectively prevented, and accordingly, the forming quality is improved; the corrugated die is suitable for processing pipes with different lengths, further, the dismounting is convenient, and the structure is firm; and besides, the circumferential weld of a product is reduced, the product quality is good, and the service life is greatly prolonged.

The invention provides an integral manufacturing method for the tube section of a large storage box based on numerical control mirror milling. The method comprises the following steps: (1) milling the upper faces and the lower faces of wall boards of the storage box in a flat board mechanical milling mode through a numerical control wall board milling machine; (2) bending and forming the wall boards through a filling rolling and bending forming method; (3) welding the bent and formed wall boards into the tube section through friction stir welding; (4) carrying out mechanical milling on the tube section integrally, and gridding of the wall boards forming the tube section is machined through numerical control mirror milling. The tube section integral mirror milling is adopted in the integral manufacturing method to replace traditional chemical milling, flat plate mechanical milling and the single curve wall board numerical control gridding milling technology, the manufacturing method of the tube section of the gridding storage box that first a tube is formed and then the tube is milled is achieved, the demand is met, and the machining precision and the machining efficiency of the tube section of the storage box are improved.

The invention discloses a construction method of asphalt wave roads, the method comprises the following steps: calculating sinusoidal function according to a sine curve parameter given by a designed file, calculating each on-site encrypted three dimensional coordinate by a computer, selecting elevation datum paved by asphalt by establishing a calculation model, completing the construction of roadbed and base course, paving the parts below a surface layer on the case course, then paving an asphalt mixture to form an asphalt surface layer, successfully finishing the final molding of the asphaltwave roads. The construction method of the invention is capable of greatly raising the quality of pavement construction and effectively guaranteeing the standard performance of asphalt wave pavement molding.

The invention discloses a polyethylene/wood powder composite wire for fused deposition modeling, and a preparation method thereof. Raw materials and assistants used by the polyethylene/wood powder composite wire for fused deposition modeling comprise 70-90 parts of polyethylene, 10-30 parts of wood powder, 5-10 parts of a compatilizer, 0.9-3 parts of a lubricant, 0.9-3 parts of a plasticizer and 0.1-0.5 parts of a stabilizer. Addition of the wood powder to the polyethylene/wood powder composite wire inhibits crystallization of polyethylene, reduces shrinkage deformation of a fused deposition modeled product, and improves the modeling precision of the product. The fused deposition modeled product has the advantages of good toughness, improved mechanical performances and strong practicality. The invention also provides the making method of the polyethylene/wood powder composite wire. The method has the advantages of easy operation, low technological conditions and production device requirements, realization of large-scale popularization and production, wide market prospect and extremely good market benefits.

The invention relates to a polyamide preparing technology, in particular to a low-water-absorption reinforced polyamide compound and a preparation method thereof. The method comprises the following step of: adding a lubricating agent and an antioxidant by taking polyamide as a substrate, taking a linear phenolic resin as a polar resin and taking glass fiber as a reinforcing body to obtain the low-water-absorption reinforced polyamide compound with low water absorbing and high size stability; the preparation method of the low-water-absorption reinforced polyamide compound disclosed by the invention has the advantages of simple processing technic and high product molding accuracy; the prepared polyamide compound can be processed by molding at the normal mold temperature, and an obtained molded plastic sample bar has high strength when reached saturated water absorption; and aid such as the phenolic resin, the antioxidant, the lubricating agent, glass fiber and the like are cheap and readily-available commercial products, so that the low-water-absorption reinforced polyamide compound is low in production cost, and is suitable for batch production.

The invention discloses a method and apparatus for producing a foamed product based on 3D printing. The apparatus mainly comprises a molding unit, a supercritical infiltration unit and a foaming unit, wherein the molding unit is a 3D printer and mainly comprises a three-dimensional ball screw sliding table, a molding platform, a 3D printer case, a plasticizing screw, a heating ring and a nozzle; the supercritical infiltration unit is mainly composed of a preheater, a booster pump, a CO2 storage tank and an infiltration vessel; and the foaming unit is mainly composed of a steam generator, a foaming case and a cover plate. The method comprises the following steps: printing a three-dimensional model via the molding unit according to product needs; then putting the three-dimensional model into the infiltration vessel in the supercritical infiltration unit and carrying out infiltration by using supercritical CO2; and carrying out steam foaming in the foaming case so as to obtain the foamed product. According to the method and apparatus provided by the invention, production stages are simplified to three production stages, so production cost and process complexity are reduced, and simplified production of foamed products with any complex structures can be realized.

The invention discloses a solidifying and melting composite material increase forming method suitable for complex parts. The method comprises the following steps that a metal part CAD geometrical model is set up, an STL model is extracted, layered slicing software is utilized for carrying out reasonable layering on the STL model with the layering thickness as a unit, outline information of all layers is extracted, and a computer generates a control instruction according to the outline information; a cutting device is used for cutting a plate of the layer according to the outline track of the layer by using the numerical control instruction corresponding to the layer; the plates of all the layers are bonded sequentially through welding flux according to the arrangement sequence of all the layers to finish bonding treatment on the whole parts; the whole parts after bonding treatment is carried out are heated to achieve solidifying and melting composite welding forming, and by means of the mode, material increase forming of the complex parts is finished. Compared with the prior art, the method has the advantages that forming efficiency is high, forming precision is high, the cost is low, the material utilization rate is high, and the applicability is high.

The invention provides a method for performing composite heating on wave absorbing materials. The method is completed in a composite heating device consisting of a hot-press pot, a microwave cavity arranged in the hot-press pot, and a microwave generator emitting microwaves into the microwave cavity, wherein the microwave cavity comprises a porous wall plate, and the porous wall plate is used for controlling the microwaves generated by the microwave generator within the microwave cavity and besides not preventing exchange of internal gas and external gas of the microwave cavity; the wave absorbing materials are arranged in the microwave cavity; and before a wave absorbing material component is heated, an intense wave absorbing material layer is arranged on partial area of the outer surface of the wave absorbing material component. The heating method comprises the following steps of performing heating by the hot-press pot to raise the internal temperature of the wave absorbing material component to medium temperature; then, stopping heating the wave absorbing material component by the hot-press pot or setting the temperature control of the hot-press pot as a heat preserving state; and starting the microwave generator to raise the internal temperature of the wave absorbing material component to target temperature. Through the adoption of the method disclosed by the invention, the condition that a whole temperature field is uniform during the molding of a molded piece is guaranteed, so that molding precision is high, and properties are good.

The invention discloses a three-dimensional printing method based on DLP (digital light processing) projection photocuring. The method particularly comprises the following steps of: constructing a three-dimensional model of an object in advance, directly obtaining a cross section of each slice to be printed, and performing processing, area division and normal value judgment through corresponding units. The data distortion is reduced; the forming precision of printing data of the method is improved; areas to be printed and printing equipment with different performance are reasonably adapted, sothat the forming dimension precision and fineness of the object are guaranteed; and the forming efficiency is improved. In addition, the invention further discloses printing equipment adapted to thethree-dimensional printing method based on the DLP projection photocuring.