31results about How to "Solve difficult demoulding" patented technology

A technology for preparing silicon rubber pipe includes such steps as directly forming the rubber pipe blank on the surface of a rubber bag suitable for the internal diameter of rubber pipe, putting them in the cavity of mould, closing the mould, applying pressure to internal space of rubber bag, sulfurizing, releasing internal pressure, and removing said rubber bag. Said rubber bag is just its dedicated moulding core.

The invention relates to a method for forming a cylindrical workpiece with transverse internal ribs. The forming method adopts the process of blanking + upsetting + reverse extrusion, and is characterized in that it adopts the processes of grooving, turning over, and turning over the inside of the blank. Rib molds, etc.; among them: the punch of the inner rib mold of the flip blank includes a punch correction ring, a punch plate, a connecting rod mechanism, a spring, a pressure rod, a limit tube, and a pressure ring; the die includes an inner flip die, an inner flip Die support ring and lower template; the invention solves the problem of difficult demoulding when extruding cylindrical parts with large or small mouths. The shear stress of the thick-walled ring rib at the upper end prevents the material from breaking during the overturn and improves the quality of the outer surface of the extruded cylinder; it saves material and has high efficiency, and is suitable for mass production.

The invention provides a polyurethane foam filled ring foaming mold, comprising: a female mold, including a left female mold and a right female mold, the left female mold and the right female mold are combined to form a mold cavity inside, and the left female mold and the right female mold are detachable connection; the male mold, including the upper male mold and the lower male mold, the upper male mold and the lower male mold are combined to form a mold cavity with the cavity of the female mold, and the mold cavity is suitable for polyurethane foam filling ring molding; the injection structure is designed On the female mold, it is suitable for injecting polyurethane foam into the mold cavity. The polyurethane foam filled ring foaming mould, male and female molds can be removed smoothly, and can avoid direct action on the product during demoulding, avoiding prying, knocking and other operations that cause damage to the product. Rapid plugging, smooth product shape, no redundant structure.

The invention relates to a cavity structure and a preparation method for the same. The method comprises the steps that a drive carrier with a geometrical similarity is provided; corresponding controlnodes are disposed on a formed fixture and the drive carrier respectively; a composite reinforced fabric is paved and fixed on the drive carrier to form a prefabricated body; the prefabricated body isadhered on the formed fixture by a fluid drive medium; and a liquid state matrix is injected and solidified, so the cavity structure can be obtained. The invention also provides the cavity structuremade with the method. The method provided by the invention is extensively applicable and especially applicable to complicated thin-wall cavity structures with abrupt cross-section changes and great changes of main axis curvatures of cavities; problems in traditional technologies such as difficulty in paving and demoulding can be solved; the formed fixture is simple and does not have many requirements for equipment, and the duration is short; and the fabricated cavity structure has a good appearance and high accuracy, is free of layering and loosening and is highly overall and reliable.

The invention discloses a color pencil lead with high flexural strength and a preparation method thereof. The preparation method comprises blending 20-40 parts by mass of a thermosetting resin, 10-30parts by mass of a thermoplastic resin, 30-50 parts by mass of base raw materials, 10-20 parts by mass of pigment powder, 3-7 parts by mass of an enhancing filler and a solvent under heating, removinga part of the solvent, carrying out roller mixing at 100-120 DEG C until uniform dispersion, extruding the mixture through a bar extruding machine to obtain bars, extruding the bars to obtain pencilleads, and then cutting the pencil leads to obtain color pencil leads with high flexural strength. The preparation method can produce a color pencil lead with high flexural strength, high writing markscrubbability and bright color, has simple processes, realizes a low cost and has high efficiency. The method is suitable for direct large-scale production of color pencil leads with various specifications in the traditional large-scale production factory without new equipment.

The present invention provides a connector production method. When production, a row of terminals are subjected to injection moulding to form a rear rubber core unit, the rear rubber core unit is fixedly connected with a front rubber core unit to form a connector unit, and any two connector units are assembled together to form the main body of the whole connector. The terminals and the rear rubber core unit are steadily fixed, so that the problem is solved that a traditional injection moulding rear rubber core module group is difficult to demould, it is ensured that the terminals are tidily arranged at the rear rubber core unit, and the requirement is satisfied that the connector is compactly and firmly assembled. The present invention further provides a connector structure, and the connector structure is cooperated with the production method provided by the invention. The rear rubber core module group is formed by two rear rubber core units with the same structure through buckling, and the front rubber core module group is formed by two front rubber core units with the same structure through buckling, and the rear rubber core units and the front rubber core units are produced on a large scale, then any two rear rubber core units and any two front rubber core units can be combined.

The invention relates to a flame-retardant glass fiber reinforced PC (Polycarbonate) / ABS (Acrylonitrile Butadiene Styrene) composite material and a preparation method thereof. The preparation method comprises the steps of: respectively and fully drying low-viscosity PC, high-flow ABS resin, chopped fibers treated by using silane coupling agent, a halogen-free composite flame retardant, an anti-dripping agent, a black color base and a processing agent; fully mixing other raw materials except for the alkali-free chopped fibers treated by using the silane coupling agent in a high-speed mixer according to a proportion; then feeding the raw material into a double-screw extruder; laterally adding the alkali-free chopped fibers treated by using the silane coupling agent; and mixing, extruding, drawing, cooling, grain-sized dicing, and drying to obtain a finished injection molding raw material. The preparation method of the flame-retardant glass fiber reinforced PC / ABS composite material, disclosed by the invention, keeps certain impact intensity and rational MFR (Melt Flow Rate), thermal distortion temperature, vicat softening point and the like of the material while obtaining high intensity, high rigidity and flame retardant properties by selecting an assistant and proportions of the raw materials reasonably and adding the fibers as well as the flame retardant.

The invention discloses an expansion-contraction mechanism for a freezer, which includes an upper fixed plate and a lower fixed plate arranged in parallel, a support plate is vertically connected between the upper fixed plate and the lower fixed plate, and a There is a front riser parallel to the support plate, and four side risers are suspended behind the front riser. The front riser and the four side risers form a box-shaped structure with an opening facing the support plate. The box-shaped structure can be used to move away from Or close to the linear movement of the support plate, the four side walls of the box-like structure can expand outward or shrink inward. The invention solves the problem that it is difficult to demould the box body foam plug crafting tooling, improves the quality of the product, and reduces the labor intensity of the operators at the same time.

The invention relates to a core mold and a shaping method for a shaping strip annular internal reinforced rib rotary body thin-wall part, wherein a base mold is composed of a base mold main body and a mold withdrawing end; a swallow tail groove and a positioning groove are formed on the base mold main body; a shape mold is wholly of an annular structure; the shape mold is uniformly divided into a plurality of split molds of same shapes; shaping arc grooves for annular internal reinforced ribs are formed on the shaping plane of the split molds; swallow tail tenons matched with the wallow tail groove and the positioning groove are formed on the inner surfaces of the split molds. By adopting the mode of combined core mold, the problem of hard demolding during the shaping process of the rotary body thin-wall part internal reinforced rib is solved. By virtue of the positioning on the base mold swallow tail groove, the movement of the shaping mold is prevented effectively; and the shaping precision of the rotary body thin-wall part internal reinforced rib is improved. The base mold, the shaping mold and the fixing pin of the core mold can be made of different metal materials according to respective strength requirements; only the mold needs to be replaced for rotary body thin-wall pieces of which the inner diameters are the same and the internal reinforcing ribs are different, so that the cost of the mold is reduced greatly.

The invention discloses a paper bucket volume variable structure. The structure comprises a paper bucket body and is characterized in that the paper bucket body is provided with a spiral structure anda folding structure which is screwed through the spiral structure to increase or reduce the internal space. The structure aims to provide a paper bucket which can obtain different internal spaces byspirally extending or compressing the corresponding height, and the paper bucket variable structure is simple to use and operate and convenient for a user to operate and use.