37results about How to "Reduce molding defects" patented technology

The invention discloses a preparation method of a master batch used for a polyvinylidene fluoride film. The preparation method comprises the steps of mixing a polyvinylidene fluoride A resin, a polyvinylidene fluoride B resin, polymethyl methacrylate, titanium dioxide, a mobility modifier and an inner lubricating agent at a room temperature until the materials are stirred uniformly, melt-extruding, cooling and granulating at a temperature of 150-250 DEG C, and drying to obtain the master batch. According to a standard of GB/T3682-2000, melt indexes of the polyvinylidene fluoride A resin and polyvinylidene fluoride B resin at a temperature of 230 DEG C and a load of 5 kg is 30-60 g/10 min and 3-20 g/10 min respectively. Performances such as tensile strength and thermal shrinkage of the film prepared by the preparation method provided by the invention are greatly improved.

The invention discloses high-performance fair-faced concrete, and solves the problem that use performance and appearance performance of fair-faced concrete in the prior art cannot be taken into account at the same time. The high-performance fair-faced concrete comprises the following components, in parts by weight: 420-460 parts of cement, 1050-1080 parts of coarse aggregate, 710-760 parts of fineaggregate, 145-165 parts of water, 15-25 parts of stone powder, 15-25 parts of silicon powder, 12-14 parts of an admixture, 20-40 parts of an expanding agent, and 1.5-3.0 parts of fibers. The fair-faced concrete provided by the invention has scientific design and a reasonable ratio; and the prepared fair-faced concrete can form a concrete building having extremely-low porosity, a uniform color, and excellent crack resistance and compression and folding resistance after being molded by casting.

The invention discloses a preparation method of a composite material shaft. The method comprises the following steps: (1) dipping aramid fiber woven cloth or carbon fiber cloth in thermosetting resinto obtain a pre-dipped material; (2) winding the pre-dipped material on an expanding shaft; and (3) enabling a cylindrical cavity and the expanding shaft, on which the pre-dipped material is wound, tobe assembled, rotating the rotating arm of the expanding shaft to send the material into a hot-pressing tank to mold, opening the tank finally, shrinking the expanding shaft, demolding and completingthe preparation of the composite material shaft. The composite material shaft is prepared through adopting a vacuum inner expansion molding mode, bubbles in a shaft body can be quickly and effectively eliminated in a vacuum state, and molding defects are reduced; inner expanding extrusion can guarantee that woven cloth layers are uniformly distributed, and the defect that resin and fiber are notuniformly distributed cannot appear; compared with existing winding molding, the composite material shaft can further bear relatively great tension-compression stress when transmitting a large torquewhile a traditional winding molding transmission shaft cannot bear great tension stress.

The invention discloses a highlight three-dimensional vein material and a preparation method thereof. The highlight three-dimensional vein material is prepared from the following ingredients in partsby weight: 70 to 90 parts of ABS resin, 5 to 20 parts of three-dimensional framework filing materials, 2 to 5 parts of compatibilizers, 0.2 to 0.5 part of light stabilizing agents, 0.2 to 0.5 part ofantioxidants, 0.5 to 1 part of lubricating agents and 3 to 5 parts of metal texture color powder. A three-dimensional framework filling material with high length-diameter ratio is used as filling; inthe injection molding shaping process, a space structure framework is formed; the flaky metal texture color powder achieves the orientation guiding effect; the prepared material has a visual angle change effect. The prepared highlight three-dimensional vein material has good three-dimensional vein effects; meanwhile, the vein three-dimensional effect has the angle change features; in addition, thematerial injection molding element has the high luster degree and low shaping defects. The highlight three-dimensional vein material can be widely applied to the appearance material in the fields ofautomobiles and electronic electric appliances.

A cartridge for detecting one or more characteristics of a fluid in a diagnostic assay system includes a plurality of chambers. At least one of the plurality of chambers includes a wall. The wall includes an intermediate portion disposed between an exterior surface and an interior surface of the wall. The intermediate portion can include a hygroscopic element configured to extend an active period of detection of a reagent. The intermediate portion can include a dummy material configured to slow a wetting of a reagent by the fluid. The intermediate portion can include an air gap configured to reduce internal stress and/or strain in the cartridge. A reagent can be enclosed by the wall of the at least one of the plurality of chambers. The reagent can be a lyophilized reagent.

The invention discloses a pouring gate structure of an injection mold of a soft rubber watchband type product and belongs to the technical field of injection molds. The pouring gate structure comprises a flow channel arranged on the injection mold; a point pouring gate is arranged between the tail end of the flow channel and a mold cavity of the injection mold; the point pouring gate is correspondingly arranged at a watchband hole position of a soft rubber watchband type product. The invention further discloses a molding method of the soft rubber watchband type product. By virtue of the pouring gate structure of the injection mold of the soft rubber watchband type product, the molding method comprises a mold closing step, a fusing step, an injection molding step, a cooling and metering step, a mold opening step and an ejection step, wherein in the injection molding step, fused raw materials are injected into the injection mold through a nozzle of an injection molding machine by adopting a multi-grade injection molding process and the pressure is kept. After the pouring gate is removed, traces remained on the product are not obvious and the quality of the soft rubber watchband type product is improved; and an operation flow is optimized, the stability of a production cycle is guaranteed, the working efficiency is improved and the production cost is reduced.

The invention discloses a frame structure for a pedal motorcycle, which comprises a frame main girder, a lower right pipe and a lower left pipe which are symmetrically arranged, and a right pipe and a left pipe which are symmetrically arranged, wherein front ends of the right pipe and the left pipe are connected through a stamping part with a U-shaped cross section; the opening of the stamping part with the U-shaped cross section is downwards; the stamping part with the U-shaped cross section coats the right pipe and the left pipe into the stamping part and connects the right pipe and the left pipe into a whole; and a left reinforcement tube and a right reinforcement tube for connecting the left and the right are welded between the front end of the right pipe and the U-shaped bottom of the lower right pipe, and between the front end of the left pipe and the U-shaped bottom of the lower left pipe respectively. The frame structure for the pedal motorcycle reduces the difficulty and the cost of the manufacturing technology of a vehicle frame, has better strength, is more convenient to assemble, provides a larger space for assembling an engine, can meet the space demand for assembling the engine without performing secondary processing on the vehicle frame, and particularly further reinforces the rigidity and the strength of the frame by making the lower left pipe and the lower right pipe form a quadrangular frame structure through arrangement of the left reinforcement tube and the right reinforcement tube.

The invention relates to the technical field of metallurgy, and particularly discloses low-carbon aluminum killed cold heading steel and a production method thereof. Components of the cold heading steel comprise 0.06-0.09% of C, 0.30-0.50% of Mn, 0.03-0.06% of Si, not larger than 0.015% of P, not larger than 0.010% of S, 0.020-0.040% of Al and the balance Fe and inevitable impurities. The low-carbon aluminum killed cold heading steel is prepared through the procedures of steelmaking, continuous casting, heating rolling and spinning. Through component adjustment and process optimization, the mechanical property of the prepared cold heading steel meets the conditions that the tensile strength Rm is smaller than or equal to 450 N/mm < 2 > and the shrinkage rate Z is larger than or equal to 70%, the produced cold heading steel completely meets the use requirement, the mechanical property is stable, and large-scale application and popularization can be achieved.

The invention relates to an environment-friendly regenerated brick preparation system, and mainly relates to the technical field of environment-friendly regenerated brick preparation, the environment-friendly regenerated brick preparation system comprises a feeding device, a crushing device connected with the feeding device, a mixing and stirring device arranged below the crushing device, a pressing device arranged at the discharging end of the mixing and stirring device, and a conveying device arranged below the pressing device; the pressing device comprises a supporting frame, a sliding mold arranged on the supporting frame and a downward pressing assembly arranged on the supporting frame. The sliding die comprises a die cylinder arranged on the supporting frame in a sleeving mode, a die connected with the telescopic end of the die cylinder, vibration exciters symmetrically arranged on the die, and a scraping plate arranged on the die in a sliding mode. The environment-friendly regenerated brick has the advantages of being good in quality and high in bearing capacity.

The invention discloses a fast in-situ molding method for a conductive fiber reinforced composite material. The fast in-situ molding method is characterized in that a plurality of metal contacts withpotential differences are arranged on a molding mechanism, the dynamical-transmitted conductive fiber is in sliding or rolling contact with the metal contacts, the conductive fiber produces the electrical loss to generate heat among the multi-stage metal contacts, and according to each stage temperature monitored by sensors, dynamic adjusting and controlling of input electrical energy of each stage is conducted; and the composite material is heated stage by stage to the molding temperature, and the fast in-situ molding is completed. The fast in-situ molding method uses the material conductivity loss as the heat source, an external heat source does not need to be applied, in the extrusion, paving, pulling fiber composite material directional movement molding process, the high-speed heatingfinal in-situ molding of the composite material is achieved, the heat response speed of the composite material is high, fiber heating is uniform, the energy utilization is high, the method can greatlyimprove the quality of the composite material in-situ molding, shorten the manufacturing cycle of the fiber reinforced composite material, and reduce the manufacturing costs.

The invention discloses an antistatic imitated cloth three-dimensional texture material for household appliances and a preparation method of the antistatic imitated cloth three-dimensional texture material. The antistatic imitated cloth three-dimensional texture material is prepared from the following components: ABS (Acrylonitrile Butadiene Styrene) resin, a macromolecular antistatic agent, special visual fibers, three-dimensional reticular filler, a reactant, an initiator, a compatilizer, a light stabilizer, an antioxidant, a lubricant and a dispersing agent. Compared with natural cloth, the three-dimensional effect is the same, the texture three-dimensional effect is clear and remarkable, the overall antistatic capacity is high, the application range is wide, and compared with a traditional material, when the composite material is applied to appearance materials of various household appliances, the electrostatic adsorption capacity of dust on the surface of a plastic part is greatly reduced, and harm of electromagnetic radiation attached to the dust to the human body is reduced; textures on the surface of an injection molded part easily form diffuse reflection on the resin surface, the overall glossiness is low, the visual effect is close to that of woven cloth, and furniture decoration and fusion are easy. The problems of poor texture effect and antistatic effect, easiness in dust adhesion and difficulty in cleaning of a cloth texture imitating material for household appliances are solved.

The invention relates to a resin molding apparatus and a method of manufacturing a resin molded product that verify whether a substrate supplied to a molding die is properly positioned or not. The apparatus includes a molding die 24 having a first die 23 and a second die 12 opposed to each other, a substrate feeding mechanism 10 for feeding a substrate to a die surface of the first die 23, a positioning mechanism that positions a positioning object 5 that includes at least a substrate; a mold clamping mechanism that molds the molding die 24; a camera 11 that is disposed between the first die and the second die when the molding die 24 is opened; and a processor that performs processing on image data captured by the camera. The first die has reference marks 29,30 which can be identified through photographing of the camera 11, and the camera 11 takes an image of the positioned object 5 and the reference marks 29 and 30. The processor 11 determines whether the object 5 is normally positioned according to the image data of the object 5 and the reference marks 29,30 captured by camera 11.

The invention provides a composite material launching box guide rail forming mold and a guide rail forming method.The guide rail forming mold comprises a lower mold, an upper mold, an insert and a bolt assembly, the lower mold is provided with a guide rail cavity, the upper mold is formed by splicing multiple sections, and the multiple sections of upper mold are connected with the lower mold through the bolt assembly; pressure generated by connection of the bolt assembly enables the guide rail to be formed to be pressurized, cured and formed in the guide rail forming mold cavity. By means of the guide rail forming die, the forming size precision, the surface smoothness and the material compactness of the launching box guide rail can be effectively guaranteed, and high-precision and ultra-slenderness-ratio composite guide rail forming can be economically and efficiently achieved. The guide rail is formed by adopting a resin pre-soaking method pressure forming process method, so that the production efficiency can be remarkably improved, the waste of auxiliary materials is reduced, and the cost is reduced.

The invention relates to an internal structure of a material injection nozzle of a mould in an APG process. The internal structure comprises a body (1) which comprises a pouring gate (2), and a material injection nozzle (3), wherein the inner wall of the material injection nozzle (3) is coated by a layer of polyfluortetraethylene material. The internal structure ensures the relatively low temperature of the material injection nozzle all the time, can maximally delay the solidification at the material injection nozzle so as to be beneficial to subsequent feeding of a formed product, maximally reduces formation defects such as product deformation, watermarks, air holes, and the like, and can well improve the qualification rate of components.

The invention discloses a tin sheet preparation device. The tin sheet preparation device comprises a pay-off wheel, a straightening mold, a guide mechanism, a pressing mechanism, a diameter measuring instrument, a correcting mechanism and a storage mechanism which are horizontally arranged in sequence, the pressing mechanism comprises an upper roller and a lower roller, a variable frequency air cooler is arranged at the top of the upper roller, and universal couplings are fixed to the ends, at the same side, of the upper roller and the lower roller correspondingly; and gearboxes are arranged at output ends of two universal couplings and connected with a motor in a driving manner through a synchronous belt. According to the tin sheet preparation device, one or more tin soldering wires can be pressed and cut simultaneously, the tin soldering sheets which are standard in size, neat and attractive are produced, and the tin soldering wire pressing and cutting device is reasonable in structure, stable, reliable, easy to operate and high in automation degree; and operators can manage a plurality of machines simultaneously, so that the production efficiency is greatly improved.

The invention provides a forming die for restraining bending springback of a plate and a forming method of the forming die. The forming die comprises a male die assembly, a female die assembly and a springback compensation assembly. The second guide sleeve is connected with the first end of the second guide column in a matched mode, and the second end of the second guide column penetrates through the second spring through the insulating rubber sleeve to be connected with the edge pressing plate. The fixed end of the sliding block guide rail is fixedly connected with the installation end of the female die fixing plate, the sliding end of the sliding block guide rail is connected with the lower end of the female die sliding block, an inclined guide column is arranged in the female die sliding block, the female die push plate is connected with the female die bottom through a fixing shaft, and electrode through holes are formed in the female die base plate, the female die fixing plate, the female die bottom and the female die push plate. The first end of the electrode sequentially penetrates through the first spring and the interior of the elastic block to be connected with the electrode through hole, and the second end of the electrode is connected with an external power source. By means of the springback compensation assembly, in the bending machining process, the forming defects caused by the bending springback phenomenon to the plate are reduced, secondary machining is reduced, the production process is automatic, and the working efficiency is improved.