100results about How to "Improve casting precision" patented technology

The invention discloses a method for producing heat-resistant steel automobile exhaust pipes by an iron mold sand lining process. The method includes modeling, core feeding, flask combining, casting, sand shakeout. Chilling position in casting of automobile exhaust pipes is determined before modeling. The special iron mold sand lining process is applied to production of heat-resistant steel, the characteristic that a sand shell cannot be separated from an iron mold during the modeling can be utilized, deformation of the sand shell is avoided, and accordingly precision of the casting is increased. Chilling points are controlled manually by controlling thickness of the sand shell, flasks of the iron mold can function in chilling and feeding sufficiently for places needed to be chilled, so that compactedness of the casting is guaranteed, product yield and quality are improved.

The invention discloses an integrally casting mold for an aero-engine diffuser. The mold comprises a pedestal and an upper cover plate, wherein an inner ring-shaped cavity structure of the diffuser is integrally formed between the pedestal and the upper cover plate, a frustum cone-shaped loose core is arranged at the center position of the inner ring-shaped cavity structure, a wax injection nozzle communicating with the inner ring-shaped cavity is arranged on the inner ring-shaped cavity structure; and an ejection structure for ejecting the molded diffuser is arranged at the bottom of the inner ring-shaped cavity structure. According to the mold provided by the invention, the diffuser cast can be integrally formed into a ring at a time without subsequent wax molding adhesion, and the problem of reverse pulling of the wax on the mold can be solved, and forming of the aero-engine diffuser with the thick wall is ensured.

The invention discloses an expendable pattern casting technique for an aluminum alloy internally provided with a spiral coiled tube water passage. According to the technique, the spiral coiled tube water passage made of stainless steel or copper is prefabricated firstly, and the upper end and the lower end of the spiral coiled tube water passage are provided with a water inlet and a water outlet which are capable of being exposed out of the column face of a motor shell correspondingly. A foaming mold is utilized for positioning and forming, an integrated motor shell EPS white mold internally comprising the prefabricated spiral coiled tube water passage can be machined through one-time forming, and then through the expendable pattern casting technique, the aluminum alloy motor shell internally provided with the spiral coiled tube water passage in an embedded mode is casted. An auxiliary structure capable of being tightly combined with the casted aluminum alloy shell is arranged on the spiral coiled tube water passage, internal stress generated by cold-hot change is reduced, and the shell is prevented from cracking. The spiral coiled tube water passage is further connected with a casting technique supporting framework, the aluminum alloy motor shell internally provided with the spiral coiled tube water passage can be stably and reliably casted on a large scale through an expendable pattern, the prefabricated spiral coiled tube water passage does not need to be filled with sand before casting, the water passage is smooth and not prone to being plugged, and it is ensured that the cooling effect is good.

The invention relates to a forward skewed multi-blade impeller with a narrow cavity, which is used for a centrifugal fan and is low in noise, and an integral casting technique thereof. The impeller comprises a base plate and a hollow front plate, and narrow blades are installed along the circumference between the base plate and the front plate. The difference lies in that the blades are arc-shaped; the radial length of each blade is 20mm-30mm; the outlet height H of the meridian plane of each blade is 10mm-20mm; the number of the blades distributed along the circumference is 20-60; and the whole impeller is integrally cast. The impeller is compact in structure, low in noise, light in weight, high in structural strength and simple and convenient in maintenance. By adopting a moveable blade mold structure to fabricate an impeller inner core blank removing mold so as to finish the integral casting of the impeller, the invention solves the technical problem of blank removal failure of a closed impeller with a narrow cavity and has the advantages of high casting precision and good quality of the impeller, low casting cost and high production efficiency. The technique is widely applicable for integral casting of various multi-blade impellers, with the effect obviously better than that of similar products.

The invention relates to a hub casting system. The hub casting system is provided with a machining table, a lower die and an upper die, and further comprises two fixing plates, two temperature controlmechanisms and two sealing mechanisms. Each sealing mechanism comprises a lifting assembly, a moving assembly and a sealing assembly. Each sealing assembly comprises a first air pump, a first air cylinder, a first piston, a push plate, a sleeve and an injection tube. Each temperature control mechanism comprises a drive assembly, a drive rod, a transmission rod, a driven rod, a cooling block and areset assembly. According to the hub casting system, the upper die or the lower die is locally cooled through the temperature control mechanisms, so that the local cooling speed is increased, the probability that molten metal at the local position flows around is lowered, and accordingly the casting precision of the hub casting equipment is improved; and as a gap between the upper die and the lower die is filled up through the sealing mechanisms, the molten metal is prevented from flowing out from the gap, and thus the sealing performance of the hub casting equipment is improved.

The invention provides a novel vertical-type centrifugal casting machine which comprises a feeding hopper, a rotating mechanism, an air cylinder, an upper pressing plate and a lower pressing plate. An inner cavity of the feeding hopper is communicated with a space under the upper pressing plate, and the upper end of a piston rod is supported at the bottom of the lower pressing plate in a jacking mode and connected with the lower pressing plate through a second bearing; the rotating mechanism comprises a motor, a driving wheel, a driven wheel and a belt, and the top of the upper pressing plate is provided with a rotation shaft. According to the novel vertical-type centrifugal casting machine, the rotating mechanism and the air cylinder used for lifting are separated and arranged to be connected with the upper pressing plate and the lower pressing plate respectively, when the rotating mechanism drives the upper pressing plate to rotate, the piston rod of the air cylinder is in a static state, therefore, the motor does not need to drive the air cylinder to rotate, and the energy consumption in the casting process can be reduced; in addition, due to the static state of the air cylinder, it can be guaranteed that the upper pressing plate, the lower pressing plate and a mould between the upper pressing plate and the lower pressing plate rotate steadily and efficiently to fully supply centrifugal force needed by casting, the casting precision is improved, and the quality of casting products is guaranteed.

The invention relates to a casting technology of a water-cooled motor shell, provided with nine turns of spiral waterways, for a new energy automobile, and belongs to the field of motor shell manufacturing. Nine turns of spiral waterway cores are manufactured by adopting a hot box precoated sand coremaking method, 17 positioning core prints are arranged on the nine turns of spiral waterway cores, the 17 positioning core prints and the nine turns of spiral waterway cores are integrally formed, and the nine turns of spiral waterway cores are fixed in a water-cooled motor shell die through the matching of the 17 positioning core prints and positioning holes in the water-cooled motor shell die so as to pour molten aluminum smelted in a gas stove under low pressure in the water-cooled motor shell die by a low-pressure casting process to obtain a water-cooled motor shell casting blank. The casting technology has the advantages that the production process is simple, time and labor are saved, the production efficiency is high, the manufacturing cost is low, the radiating performance is high, the comprehensive performance of the product is stable, and the requirement of the water-cooled driving motor for the new energy automobile can be well met.

The invention discloses an environmental-protection molding sand cooling recovery device. The device comprises a tower body, and a first separation plate, a second separation plate and a blanking collecting plate arranged in the tower body in sequence from top to bottom; a crushing bin is fixedly connected with a fixed inclined surface end, a slide inclined surface end and a first driving cam in sequence from left to right; a first return spring is arranged between the slide inclined surface end and the first separation plate; the first driving cam is matched with the right side surface of theslide inclined surface end, and can butt against the slide inclined surface end to move to the left side to realize pressing of the first return spring; when the first return spring is reset, the slide inclined surface end can be driven to move to the right side; a discharge port is formed in the lower part of the blanking collecting plate; and the tower body is provided with a cooling intake endon the left side wall and an air collecting device on the right side wall. The device cools molding sand through the cooling intake end and the air collecting device, achieves better cooling effect,and is compact in structure, convenient to use, energy-saving, environment-friendly and suitable for wide application in cooling recovery of the molding sand.

The invention discloses a fully automatic casting machine that comprises a steel strip, a scraper box, an automatic charging system and a trolley. The steel strip is arranged on a closed belt between two trolleys. The steel strip goes through the inner part of a baking tunnel between two trolleys. The scraper box and the automatic charging system are arranged on a driving trolley end. A skinning knife and a take-up rotating axis are arranged on a driven trolley end. The automatic casting machine can be used for manufacturing piezoelectric electric ceramics and chip electric ceramics.

The invention discloses a water-soluble 3D-printing supporting wax. The water-soluble 3D-printing supporting wax comprises the following components in parts by weight: 20-90 parts of polyethylene glycol wax, 5-50 parts of a water-soluble tackifier, 0.1-1 part of a nucleating agent, and 0.1-0.5 part of an antioxidant. The invention further provides a preparation method of the supporting wax. The supporting wax has the characteristics of being fast in dissolving speed in water, high in printing accuracy, simple in removing processes, safe, environmentally friendly, and suitable for massive application; meanwhile, a printing wax die cannot be damaged, so that the wax die printing accuracy and the casting accuracy are improved.

The invention discloses a top-bottom bidirectional uniform sand ejection casting and modeling device and a method for manufacturing a sand mold by the device. The top-bottom bidirectional uniform sand ejection casting and modeling device comprises a left sand box, a right sand box, a replaceable double-sided mold plate, a sand box moving device, a left and right horizontal extruding device and a top-bottom bidirectional vertical sand ejection device. When the sand mold is manufactured by adopting the top-bottom bidirectional uniform sand ejection casting and modeling device, sand is added and compressed twice and gas is exhausted, so that the density differences in the sand mold casting process are reduced greatly; according to the top-bottom bidirectional uniform sand ejection casting and modeling device, the molding is accurate, firm impaction is realized, the sand compaction effect is good, the energy consumption is low, the efficiency is high, and multiple defects caused by pure air impulse modeling can be overcome.

The invention discloses a preparation method for a precision cast mold shell and a preparation method and application for a precision cast casting. According to the preparation method for the precision cast mold shell, the mold shell is made of the casting with an integrated structure of an oil cavity and an inner ring, the preparation method for the precision cast mold shell comprises the following steps that a bearing casing wax mold is prepared, and the wax mold is combined with a pouring gate to form a mold set tree; at least two layers of shell making is performed on the surface of the mold set tree, and a blind cavity end mouth and an inner ring opening are reserved; slot blocking materials are filled into a blind cavity of a bearing casing through the blind cavity end mouth and theblind cavity end mouth is sealed, drying is performed, and a blind cavity inner mold shell is formed; after the blind cavity inner mold shell is prepared, the at least two layers of shell making is performed on the surface of the mold set tree again, and the inner ring opening is reserved; and high cooling effect materials are filled into the inner ring through the inner ring opening and the innerring opening is sealed, the drying is performed, at least one layer of shell making is performed on the surface of the mold set tree again, dewaxing and sintering are performed, and the mold shell isobtained. By means of the mold shell prepared by the preparation method for the precision cast mold shell, blind cavity pouring steel leakage can be solved, and the problem of thick and large inner ring loose can be improved.

The invention provides a simple preparation method of a stripping pattern mold for casting of a three-blade isometric screw inducer. By preparing an inducer mold and carrying out an appropriate sand excavation operation, a cover box mold and a stripping pattern blank are cast, and thus a stripping pattern plate is obtained. The cover box mold is combined with the stripping pattern plate, and a support frame, a connecting shaft, a guide shaft sleeve and a rotating rod are fabricated and constituted to obtain a whole set of mold. With this technological equipment, an inducer without parting surface may be cast by a sand mold casting method; thus, the problems of poor casting accuracy, high grinding difficulty and low yield of inducers are solved, and the production efficiency and casting precision of isometric screw inducers are significantly improved with reduced production costs.

The invention discloses an impeller manufacturing process method and an impeller. The process method comprises the following steps: preparing a wax mold, subjecting the wax mold to heat preservation and cooling, coating the outer surface of the wax mold with at least one coating layer and drying to form an outer shell; melting the wax mold in the outer shell by adopting water vapor to form a cavity; fusing stainless steel raw materials to form molten steel, heating the outer shell to a set temperature, pouring the molten steel into the cavity, forming an impeller model after the molten steel in the cavity is solidified, taking the impeller model out of the outer shell and polishing, and carrying out primary shot blasting, acid pickling and argon welding on the impeller model to form the impeller. According to the impeller manufacturing process method, the operation is convenient, the casting precision of the impeller can be greatly improved, the structural firmness of blades can be improved on the premise that the thickness of the blades is reduced, and therefore the service life of the blades can be prolonged.

The invention discloses a transformation impact case-free tightly molding device and a method for molding by using the transformation impact case-free tightly molding device. The transformation impact case-free tightly molding device comprises a left sand case and a right sand case, a replaceable two-sided plate, a sand case moving device, and a left-right horizontal extrusion device; when the device is used for modeling, the compactness difference in the sand mold cast process is effectively improved by adding sand twice, compressing and exhausting twice, the modelling is precise, the impact is tight, the solid sand effect is good, the energy consumption is low, the efficiency is high, and numerous disadvantages caused by simple air-impacting modelling can be overcome.

The invention relates to the technical field of artificial intelligence, and provides a nozzle casting monitoring method and system based on image processing, and the method comprises the steps of obtaining a plurality of groups of operator operation images of each completed process in a real-time nozzle casting process, and further obtaining a machining index of each completed process; and determining the lowest processing index of each uncompleted process according to the product quality score of a qualified product, the processing index of each completed process, the influence index of each completed process on the product quality, the influence index of each uncompleted process on the product quality and the importance index of each uncompleted process. The completed processes are monitored in real time, the machining indexes of all the remaining processes are dynamically obtained according to the monitoring result, the casting process of the nozzle is guided, the product quality is guaranteed, and the casting precision of the nozzle is improved.

The invention discloses a machining process of a gear. The process comprises following steps that a demolding agent is coated on an inner cavity of a gear pressure casting mold; an inner gear pressurecasting mold body is preheated; a steel ingot raw material is heated to molten steel in the molten condition, heat preservation is carried out, the heat preservation temperature ranges from 1300 to 1500 DEG C, and the heat preservation time ranges from 40 to 60 min; the pressure casting mold in the S10 is continuously heated, the temperature ranges from 1200 to 1400 DEG C, molten steel in S30 ispoured into the pressure casting mold, after pouring, the pressure casting mold at the constant temperature is pressurized from a sprue gate, the pressure ranges from 0.01 to 0.015 MPa, the pressurizing time is kept 40 to 50 min, the pressure casting mold is cooled to the room temperature, a gear is subjected to demolding treatment, and the gear is ground and polished to form a gear finished product. The machining process improves the casting precision, is low in cost, and high in structural strength and improves the production efficiency.

The invention relates to a preparation method for a magnesium-based composite material, in particular to a preparation method for lost foam casting of a high-entropy alloy particle-reinforced magnesium-based composite material. The method aims to solve the technical problem that in the preparation process of an existing magnesium-based composite material, the addition proportion of magnesium alloywaste is small, and the strength is poor when a large amount of magnesium alloy waste is added. By adopting a lost foam casting method, utilizing two-way shear stirring, adding high-entropy alloy particles and performing ultrasonic treatment in the casting process, structure heredity is effectively improved, uneven dispersion of the particles at different positions of a magnesium alloy melt is avoided, structure coarsening is reduced, grain growth in the solidification process is inhibited, grains are refined, the utilization rate of magnesium alloy waste is increased, and the performance ofthe lost foam casting product is improved. In the method, the utilization rate of AZ91D waste is high, the maximum waste addition amount accounts for 34% of the total mass, raw materials are saved, and costs are reduced. The method is also suitable for continuous production operation and is an environment-friendly method.