40results about How to "The upper and lower surfaces are flat" patented technology

The invention provides a vacuum assistant resin infused method for molding a large part of sandwich composite materials as follows: a set of grooves parallel to each other are arranged at the bottom of the foam core material; fiber fabrics are paved on a processed die according to the specified thickness, and then the grooved foam core material is arranged on the already-paved fiber fabrics, wherein, the machined surface of the grooves of foam core material contacts to the already-paved fiber fabrics, and then the fiber fabrics with a specified thickness are paved on the foam core material; a conduction pipe is arranged at one foam core material end with grooves and a vacuum pipe is arranged at the other end; sealed vacuum bag film and sealed adhesive tape are adopted to seal the fiber fabrics; when the vacuum pressure in the sealed bag film is equal to or less than negative 0.095Mpa, resin solution is inducted to the resin conduction system consisting of the conduction pipe and the conduction cloth after being poured with glue; after the resin immerses the fiber fabrics completely, glue pouring and evacuation are stopped; after the poured-in resin is heat-released and solidified, sandwich composite materials are obtained after 24 hours solidification under indoor temperature condition.

The invention relates to a fiber-reinforced modified-reaction injection-molding nylon sheet and a preparation method thereof, belonging to the field of composite material preparation. An amide monomer is used as a basal raw material; a catalyst, an auxiliary catalyst, an auxiliary antioxidant, a stabilizing agent, a surface conditioning agent, and the like are added; and the materials are injected into a high-temperature mold cavity with preset fibers by an RIM and thermally pressed and molded to prepare the reinforced modified-reaction injection-molding nylon sheet. The prepared sheet comprises the following ingredients by mass percentage: 30 to 95 of amide monomer, 3 to 70 of fiber, 0.01 to 2 of catalyst, 0.01 to 10 of auxiliary catalyst, 0.1 to 2 of antioxidant, 0.1 to 2 of stabilizing agent and 0.1 to 1 of surface conditioning agent, wherein the amide monomer is caprolactam or dodecalactam, the fiber is one of glass fiber, carbon fiber or aramid fiber and is in the form of fiber cloth, short-cut fiber or compound fiber. Compared with common reaction injection nylon and monomer cast nylon sheets, the reaction injection-molding nylon sheet has stronger carrying capability, low manufacture cost and easy popularization and application.

The invention belongs to the field of polymer dielectric materials and discloses an ultralow dielectric constant film with a special sandwich structure and a preparation method thereof. The ultralow dielectric constant film with the sandwich structure comprises a three-layer structure, namely a compact layer 1, an electrospinning layer and a compact layer 2 sequentially. The invention also discloses the preparation method for the ultralow dielectric constant film with the sandwich structure, which comprises the following two key steps of: directly performing electrospinning on a compact bottom film; and performing pressurization heat treatment. Through the adjustment of a material structure, multiple problems of a single electrospinning film are solved, lower dielectric constants are kept, the ultralow dielectric constant film which is provided with upper and lower smooth and compact surfaces and has the sandwich structure can be obtained, the defects of a rough surface and an over-high water adsorption ratio of the conventional electrostatic spinning film are overcome, and the preparation method is similar to that of the conventional single electrospinning film and is easy to implement.

The invention relates to an integrally formed carriage plate for a van and a manufacturing technology. The outer layer of the carriage plate is made of glass steel, and a PVC foam plate is adopted as an interlayer. The technology comprises the following steps that 1, demoulding material processing and room-temperature curing are performed; 2, a surfacing mat, a composite mat, the PVC foam plate and a diversion composite mat are laid; 3, omega tubes and a winding pipe are fixed, sealing adhesive tapes are bonded, and a demoulding cloth and a vacuum bag are laid to form a vacuum system; 4, the vacuum system is connected with a resin collector in a sealed mode, and the leakproofness of the vacuum system is detected; 5, vacuum pressure maintaining is performed; 6, resin is prepared and poured in a vacuum mode; 7, solidifying, demoulding and postprocessing are performed. Compared with prior art, the PVC foam plate is used as the interlayer, and therefore the advantages of being capable of achieving water resistance, flame retardance, acid and alkali resistance, moth proofing, light mass, high hardness, heat preservation, sound insulation and shock absorption; vacuum infusion and integrally forming are achieved, and therefore the two surfaces of the carriage plate are smooth.

The invention discloses a battery separator producing system and method. The battery separator producing system comprises an AGM separator molding device, a drying device and an optical inspection device which are sequentially connected. The AGM separator molding device comprises a conveying net belt, two sets of vacuum water suction boxes and a circulation net belt, wherein the conveying net belt is used for driving an AGM separator, the vacuum water suction box is used for dewatering the AGM separator, and the circulation net belt is arranged above the conveying net belt and abuts against the top face of the AGM separator. The first set of vacuum water suction boxes act with the bottom face of the conveying net belt, and the second set of vacuum water suction boxes act with the side, opposite to the AGM separator, of the circulation net belt. The optical inspection device comprises a lamp box internally provided with a light emitting element. The side, facing the AGM separator, of the lamp box is provided with an inclined light inlet window. An air inlet is formed in the bottom of the lamp box and communicated with an air feeder. The top of the lamp box is provided with an air outlet facing the AGM separator. The slurry drying time can be shortened, the upper and lower planes of the molded AGM separator are flat, and the AGM separator performance is improved.

The invention relates to a mould structure for processing mechanical parts, in particular to a preforging mould structure for processing shaft fork stamp forgings. The preforging mould structure for processing the shaft fork part stamp forgings comprises a preforging upper mould and a preforging lower mould which are used for horizontally arranging a shaft fork part forging and pressing mould and is characterized in that: on the outer edge of the shaft fork part, mould joints of the preforging upper and lower moulds are positioned on the upper and lower symmetrical central surfaces of the part; and on the mould joint of an inner circle of a fork lug part, namely a U-shaped inner circle, the preforging upper mould is extended downward one circle, and the preforging lower mould is recessed downward one circle of the corresponding height. Due to the mould structure, under the condition of the same amount of the used materials, a cavity can be filled by metal conveniently, rejection rate of a forging is reduced, a flash width is smaller, a horizontal projection area is smaller, equipment tonnage can be reduced, the bearing load of the mould is smaller, the service life of the mould can be prolonged, and due to slight flash, materials and cost can be saved, and problems that blank is deflected and is not placed stably before can be solved.

The invention discloses a curved glass and a molding method thereof. The method includes: (1) taking a glass substrate with a thickness of h0 for one-shot forming to obtain a curved glass green body with a vertical projection height of h1; (2) subjecting the curved glass green body to secondary forming to obtain curved glass with a vertical projection height of h2, wherein in horizontal projection, the length perpendicular to the axial direction is 2L, and h2/L is greater than or equal to 1/6 and less than or equal to 1, (h1-h0):(h2-h0)=(0.6-0.9):1. The method is beneficial to reducing the residual stress inside the molded curved glass, reducing or avoiding the possibility of pits, press marks and other defects, and improving the yield rate of molded curved glass, endows the curved glass product with smooth upper and lower surfaces, and optimizes the appearance quality of the curved glass.

The invention discloses an environment-friendly bolt type power electronic rectification chip forming process which comprises the following steps: (1) preparing a plurality of tin-copper alloy soldering lugs and lead-tin alloy soldering lugs, wherein the weight percentage of tin in the tin-copper alloy soldering lugs is 96%-98%, and the weight percentage of copper in the tin-copper alloy solderinglugs is 4%-2%; (2) sequentially filling the tin-copper alloy soldering lugs, the lead-tin alloy soldering lugs, a cathode molybdenum plate, a siliceous rectification chip and an anode molybdenum plate into a die hole of each graphite sintering die; (3) feeding the plurality of graphite sintering dies into a vacuum chamber of a horizontal vacuum sintering furnace; and (4) carrying out sintering and molding by using the horizontal vacuum sintering furnace. According to the invention, tin-copper (97:3) alloy replaces lead-tin (95:5) alloy material to be used as the cathode and anode surface weld-aid layers of the rectification chip product, so that the environmental protection index of the product is greatly improved, the application market of the product is expanded, the production efficiency of the product is greatly improved, and the phenomenon that the traditional lead enameling process affects the health is avoided.