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

The invention relates to a winding die for molding an interior grid stiffened cylindrical shell structure part. The winding die comprises a body die, a core die and an outer die; evenly-arranged T-shaped grooves are formed in the two sides of the body die, the core die and the body die are assembled through T-shaped blocks, the outer die is arranged on the outer side of the core die and used for limiting the appearance of the molded part, end frame flanges facilitating turnup of the molded part are arranged at the two ends of the body die, and sealing heads are arranged on the outer side of the end frame flange. The using steps of the die comprises (1) cleaning and die assembling, (2) reinforcing rib winding, and vacuum bag hitting for pre-compaction; and (3) moving the die to a drying oven for curing, and demolding after curing is carried out. The winding die can be repeatedly used, grid reinforcing ribs of the molded product have the high size accuracy and position accuracy, the product quality consistency is good, and later period assembly of the product is facilitated.

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 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 centrifugal casting equipment capable of automatically coating paint. The centrifugal casting equipment comprises a machine body, a detachable end cover is arranged at the leftend of the machine body, a feeding port communicating left and right is formed in the axis of the end cover, a working cavity is formed in the machine body, the feeding port communicates with the left side of the working cavity, a cooling water jacket is arranged on the side, away from the axis of the feeding port, of the working cavity, a closed door cavity communicating with the working cavityis formed in the right side of the cooling water jacket, and a closed door capable of moving in the direction away from or close to the axis of the working cavity is arranged in the closed door cavity. According to the centrifugal casting equipment, the problem that formed metal is difficult to demold is effectively solved by coating the inner wall surface of a metal liquid forming cavity with thedemolding coating, the metal liquid is rapidly cooled through water path circulation in the device, the overall casting time is effectively shortened, the casting efficiency is improved, and the product quality is improved.

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 carbon fiber three-piece combined rim and a forming die thereof, and relates to the field of rims and forming dies thereof. The carbon fiber three-piece combined rim is characterized in that the inner end surface of an outer rim and the outer end surface of an inner rim are fixedly connected through high-strength adhesive to form a rim body, a central boss is arranged at the inner end of a spoke, the central boss of the spoke is arranged in a central cavity of the rim body, and the spoke is connected with the rim body in a locking mode. The forming die comprises an outer rim die set and an inner rim die set, when an upper die and a lower die of the outer rim die set are compounded, a cavity which is consistent with the contour shape of the outer rim to be manufactured is formed between the top surface of an annular boss of the upper die and the groove bottom surface of an annular inner groove of the lower die, and is used for forming the contour of the outer rim; and an inner core of a round pipe of the inner rim die set is arranged coaxial with a die cover and the inner core of the round cake, and carries out mutual insertion for positioning operation, and a round pipe outer die is arranged coaxial with the mold cover, and carries out mutual insertion for positioning operation. The forming die is used for forming the carbon fiber rim.

The invention provides a polyurethane foam filled ring foaming mold. The polyurethane foam filled ring foaming mold comprises a female mold, a male mold and an injection structure, wherein the femalemold comprises a left female mold and a right female mold, after the left female mold and the right female mold are assembled, a cavity is formed inside the left female mold and the right female mold,the left female mold and the right female mold are detachably connected, the male mold comprises an upper male mold and a lower male mold, after the upper male mold and the lower male mold are assembled, the upper male mold and the lower male mold cooperate with the cavity of the female mold to define a mold cavity, the mold cavity is suitable for formation of the polyurethane foam filled ring, and the injection structure is arranged on the female mold and suitable for injecting a polyurethane foam material into the mold cavity. According to the polyurethane foam filled ring foaming mold, thefemale mold and the male mold both can be smoothly detached, during demolding, it can be avoided that demolding directly acts on the product, it is avoided that prying, beating and other operation damage the product, and an injection opening can be rapidly sealed after the foam material forms for a certain extent; and the appearance of the product is smooth, and no redundant structure exists.

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 method for roasting vanadium-containing raw materials to prepare vanadium-containing clinker. The method comprises the following steps: a. uniformly mixing vanadium slag, stone coal and caustic soda in a certain percentage by weight to prepare the raw materials; b. pressing the raw materials prepared in the step a under the pressure intensity of 15-20MPa to prepare pellets; c. charging the prepared pellets into a drying kiln and drying; d. preheating the dried pellets through a preheating rotary kiln, and then roasting the pellets through a roasting rotary kiln; ande. rapidly cooling the roasted pellets to prepare the vanadium-containing pellet clinker. According to the method disclosed by the invention, the pellets are prepared from the mixed materials, and thestone coal is added into the pellets, so that a series of problems of material entrainment due to powder bonding is effectively solved; and meanwhile, the problems of material bonding due to a too high heat release amount in a roasting process for the vanadium slag, and insufficient heat due to independent roasting for the stone coal, are also greatly solved. Carbon in the stone coal plays a lubrication role; and meanwhile, a two-stage roasting manner is adopted, so that the conversion rate for the vanadium-containing raw materials is increased.

The invention relates to a blank inner rib overturning die for a cylinder workpiece with transverse inner ribs. The blank inner rib overturning die comprises a male die, a female die and a lower ejector rod. The blank inner rib overturning die is characterized in that the male die comprises a male die correcting ring, a male die pressing plate, a connecting rod mechanism, a spring, a pressing rod, a limiting pipe and a pressing ring; the male die pressing plate is fixedly connected to the lower end of the pressing rod, the male die correcting ring is arranged on the pressing rod in a sleeving manner, and the connecting rod mechanism is connected with the male die correcting ring and the male die pressing plate; the spring is arranged in the limiting pipe, and the spring and the limiting pipe are arranged on the pressing rod between the male die pressing plate and the male die correcting ring together in a sleeving manner, and are fixed on the male die pressing plate through the pressing ring; the female die comprises an inner overturning female die body, an inner overturning female die body supporting ring and a lower die plate; and the overturning female die is connected to the inner overturning female die supporting ring, and the inner overturning female die supporting ring is fixed to the lower die plate. According to the blank inner rib overturning die, the problem of difficult demolding due to extrusion of the large-and-small-opening cylinder workpiece are solved, the shearing stress during overturning is reduced, material breakage during overturning is prevented, and the extrusion quality of the outer surface of a cylinder is improved.

The invention relates to a two-end closing tubular composite material component forming method. According to the forming method, a tubular meltability die is formed in a cavity of an auxiliary die formed through tubular combination of an upper die and a lower die, and the outer profile of the cavity of the auxiliary die is the same with the inner profile of a tubular composite material component.The two-end closing tubular composite material component is prepared through the tubular meltability die, after the tubular composite material component is formed, heating is conducted to make the tubular meltability die softened, and then demoulding is finished. Demoulding is achieved through the glass transition temperature difference of the tubular meltability die and the tubular composite material component, usage of a metal combined die is avoided, the die manufacturing cost and manufacturing difficulty are reduced, thermoplastic plastics used in the meltability die have the characteristic of being recyclable, repeated usage can be achieved, and the method has the characteristics of being simple and convenient to operate, low in cost and the like.

The invention discloses stirring equipment for producing resin-bonded mastic, and belongs to the technical field of industrial stirring equipment. The stirring equipment comprises a shell, a stirringshaft, stirring blades and a power device, wherein the stirring shaft, the stirring blades and the power device are arranged in the shell, the power device is connected with the stirring shaft and drives the stirring shaft to rotate, the stirring blades are installed on the stirring shaft, easy-to-demold layers are arranged on the surface layers of the stirring shaft and the stirring blades, and asmooth film layer is arranged on the inner wall of the shell. According to the invention, the stirring shaft and the stirring blades are provided with the easy-to-demold layers, and the inner wall ofthe shell is provided with the smooth film layer, so that the resin-bonded mastic is not bonded, the resin-bonded mastic is easy to demold, and the used stirring equipment is easy to clean; and the easy-to-demold layer adopted by the invention is a heat shrinkable film which is low in price, long in service life, simple in operation process and extremely suitable for production.

The invention provides a forming mold for a prefabricated hollowed-out concrete member. The forming mold comprises a working platform and a forming structure located on the working platform, wherein the forming structure comprises a plurality of modules, each module comprises an inner core column, the side face of each inner core column is wrapped with an outer mold wrapping layer, and the adjacent modules are spaced to form prefabricated concrete pouring cavities. The invention further provides a construction method for the prefabricated hollowed-out concrete member. According to the forming mold and the construction method for the prefabricated hollowed-out concrete member, the problems that an existing mold for preparing an oversized hollowed-out concrete member is extremely difficult to demold or the member is fractured due to the conditions of complex rib distribution, non-prestress and the like formed by a curved hollowed-out shape of the member can be solved, and the prepared concrete member is high in dimensional precision and low in manufacturing cost.

The invention discloses a chair, and the chair comprises a chair surface, chair legs and reinforcing ribs; the chair surface, the chair legs and the reinforcing ribs are formed through one-time injection molding; the chair legs are perpendicular to the chair surface, and the reinforcing ribs are located at the bottom of the chair surface and used for connecting the chair surface and the chair legs. A chair machining process comprises the following machining steps: S1, pouring plastic used for machining a chair into a pouring gate of a mold, and after a cavity of the mold is filled with the plastic, performing cooling forming; S2, opening the front mold, pushing an ejector plate through an ejector rod hole, enabling an ejector pin and an ejector sleeve on the ejector plate to synchronouslymove upwards, pushing the chair out of a cavity, realizing demolding, and compressing a spring; S3, after the chair is demolded, enabling the spring to rebound, so that the ejection plate, the ejectorpin and the ejection sleeve are reset, and one-time injection molding is completed. The chair produced by the invention overcomes various defects of a plastic chair formed by combining metal tubes and plastics; meanwhile, the design that the chair legs are perpendicular to the chair surface enables the bearing of the plastic chair to reach the maximum value, the production process is simple, anda large amount of cost is saved.

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.