154 results about "Vacuum casting" patented technology

The invention relates to a plaster casting method for a large-sized complex thin-walled magnesium alloy part. The method comprises the following steps of coating the surface of an assembled form with a coating in situ, and arranging shapeless cold iron on a hot spot part, wherein a mixture for manufacturing the shapeless cold iron comprises the following components in percentage by mass: 1.25 percent of phenolic resin, 0.4 percent of toluenesulfonic acid, 1 to 1.5 percent of boric acid, 2 percent of bentonite and the balance of 70 to 140-mesh chromite sand; pouring a casting in an adjustable pressure casting device, arranging a plaster mold poured by the form at the casting position of the adjustable pressure casting device, filling a tank with dry air or a CO2 atmosphere with SF6 content of 0.1 to 1.0 percent, and performing vacuum casting and pressurized solidification, wherein the casting temperature is 710 to 750 DEG C, vacuum degree for primary mold filling is minus 0.6Mpa to minus 0.8Mpa, and the solidification pressure is 0.020 to 0.025Mpa. According to the method, oxidization can be prevented, the mold filling capability can be improved, shrinkage cavities and shrinkage porosities in the casting are reduced, and the obtained magnesium alloy casting is higher in density.

The present invention relates to one kind of wear resistant bainite cast steel liner plate and its manufacture process. The cast steel liner plate material consists of C 0.45-0.55 wt%, Si 1.6-2.0 wt%, Mn 2.8-3.3 wt%, P not more than 0.06 wt%, S not more than 0.04 wt% and Fe for the rest. Its manufacture process includes smelting in a medium frequency induction furnace, vacuum casting, cooling controlling heat treatment to obtain complex phase bainite structure, and final low temperature tempering. The liner plate material consists of needle like bainite as main component, small amount of martensite and residual austenite, and has hardness of HRC53-55, impact toughness of 22-27 J/sq cm, and excellent comprehensive performance.

The invention relates to the technical field of a composite material, and particularly relates to a cast silicon carbide composite material and a preparation method thereof. Aluminum oxide ceramics, high-density polyethylene and a rubber lining material cannot simultaneously meet the requirements of equipments on the abrasive resistance, the corrosion resistance and the mechanical strength at present. Import special ceramics equipment is high in price although long in service life so as to result in the problems of high operation and production costs. The cast silicon carbide composite material provided by the invention mainly contains silicon carbide, a short glass fiber, alumina powder, a carbon fiber, an adhesive component and an additive. Kinds of products with complicated shapes can be manufactured by adopting a vacuum casting production technology. The material is good in abrasive resistance, strong in chemical resistance, high in mechanical strength, and applicable to solid-liquid and solid-gas dual-phase medium conveying equipments.

The invention belongs to the technical field of magnesium-lithium alloy material preparation, and particularly relates to a high-strength high-plasticity high-yield-ratio magnesium-lithium alloy and apreparation method and application thereof. The high-strength high-plasticity high-yield-ratio magnesium-lithium alloy and the preparation method and application thereof are used for solving the problems of low absolute strength, difficult matching of strong plasticity and yield ratio of the magnesium-lithium alloy, the high-strength high-plasticity high-yield-ratio magnesium-lithium alloy material with high yield ratio, good plasticity, stable quality and high purity is obtained by designing the components of the magnesium-lithium alloy, optimizing a vacuum casting process and adopting a novel deformation heat treatment process, and the magnesium-lithium alloy has an industrialized practical application prospect. According to the preparation method of the high-strength, high-plasticity and high-yield-ratio magnesium-lithium alloy, the plastic processing procedure is simple, the maneuverability is high, only medium-high temperature solution treatment and medium-low temperature deformation are needed, intermediate process annealing is not needed, the yield is high, the economical efficiency is high, and the magnesium-lithium alloy product with the tensile strength of 330 MPa, the yield strength of 314 MPa, the elongation of 16% and the yield ratio of up to 95% or above can be obtained through the method.

The invention relates to a multi-ingot vacuum casting device and a method for implementing vacuum casting by using the device. The multi-ingot vacuum casting device comprises a pedestal, steel ingot molds, a vacuum tank, a vacuum cover, a vacuum cover vehicle, a tundish, a slide gate nozzle mechanism, a guide sleeve, a separation pipe, a lifting mechanism, a viewing window, a pump-out pipe, a vacuum pump system, a main vacuum valve, and a vacuum break valve, wherein the pedestal is arranged in the vacuum tank; the steel ingot molds are arranged on the pedestal; a vacuum cover is connected with a lifting mechanism arranged on the vacuum cover vehicle; the slide gate nozzle mechanism is arranged on the tundish; the guide sleeve and the viewing window are arranged on the vacuum cover; the slide gate nozzle mechanism, the guide sleeve and the steel ingot molds are communicated with each other; the main vacuum valve and the vacuum valve are arranged on the pump-out pipe; and the pump-out pipe is connected with the vacuum tank and the vacuum pump. The inventive technical proposal also includes the method for implementing vacuum casting by using the device. The multi-ingot vacuum casting device has the advantages that (1) the device has simple structure; (2) the molten steel casting process is carried out under high-vacuum condition to improve the quality of molten steel and eliminate the problem of unstable quality of small ingots formed by air casting; and (3) a plurality of ingots can be formed by one step, thus improving the production efficiency.

The invention relates to a casting device, in particular to a steel ingot vacuum casting device. The steel ingot vacuum casting device comprises a refining ladle, a middle ladle and a vacuum tank, wherein the middle ladle is arranged below the refining ladle; the vacuum tank is arranged below the middle ladle; the middle ladle is connected with the vacuum tank through a plug rod; at least two steel ingot dies are arranged in the vacuum tank, are arranged on a moveable trolley in one line or are peripherally arranged on a rotary platform; and when one steel ingot die is positioned at a casting station, the steel ingot die is positioned right below the plug rod. The steel ingot vacuum casting device is simple in structure, flexible and variable. The requirement of casting a plurality of steel ingots by one vacuum chamber and one middle ladle can be completely met, the yield of molten steel is improved, the consumption of the middle ladle is reduced, the stable running of a production organization is facilitated, and the production and running cost is low.

The invention discloses a sand box returning mechanism used for a vacuum casting line system and comprising a sand box returning line, a sand box hoisting bracket and a roller way, wherein the rear end of the sand box returning line is connected with a casting mechanism of the casting line system so that a sand box can be conveniently returned to the casting mechanism; the sand box hoisting bracket is provided with a vertically arranged guide rod and a clamping component moving upwards and downwards along the guide rod. At least one pair of clamping paws of the clamping component are respectively hinged with a clamping component body so as to facilitate the opening and closing operation. The front end of the roller way is positioned above a supporting plate returning shuttle car, and the rear end thereof is positioned above the front end of the sand box returning line. The roller way passes through the upper side of a sand dropping mechanism so as to facilitate the directional walk ofthe sand box hoisting bracket among the supporting plate returning shuttle car, the sand dropping mechanism and the sand box returning line, thereby reliably guaranteeing an operator to keep away froman area with high temperature, high silicon dust content and high danger. Based on the sand box returning mechanism, the invention also provides a returning method using the sand box returning mechanism and a vacuum casting line with the sand box returning mechanism.

The invention discloses an anticorrosion high-strength alloy, consisting of the following elements in percentage by weight: 30 to 40 percent of Ni, 18 to 22 percent of Cr, 7 to 12 percent of Mo, and the balance of Co and unavoidable impurities. The content of the impurities has the following elements in percentage by weight: less than 0.05 percent of C, less than 0.20 percent of Si, less than 0.25 percent of Mn, less than 0.010 percent of S, less than 0.015 percent of P, less than 1.0 percent of Tim, and less than 2.0 percent of Fe. The smelting method comprises the following steps: 1) selecting the required chemical elements, smelting the elements in a vacuum inductance furnace, regulating the content of each element in the smelting process to ensure the weight of each element accords with the designing requirement, controlling the content of impurity elements as low as possible, and casting the alloy into a consumable electrode by a vacuum casting method; and 2) carrying out electroslag remelting on the consumable electrode to further reduce the content of impurity elements to ensure that the electrode accords with the designing requirement to obtain an electroslag remelt ingot with excellent quality. The alloy and the metal product manufactured by the corresponding process method have higher strength and excellent anticorrosion performance.

The invention relates to a method for manufacturing a dental cobalt-chromium ceramic alloy disc material suitable for a CAD/CAM (Computer Aided Design / Computer Aided Manufacturing) tooth carving machine, belonging to the technical field of a dental material. The method comprises the following steps of: preparing furnace charge, then putting the furnace charge into a furnace for vacuum melting and vacuum casting, and rolling with a rolling mill, wherein the rolling temperature is 1200-1300 DEG C, the rolling deformation is 2.6-4.8 percent, and the rolling pass is 2-6 passes; forming a semi-finished product material; and finally according to the needed thickness, causing the semi-finished product material to be subjected to wire cutting and turning of a turning lathe to obtain the dental cobalt-chromium ceramic alloy disc materials with different thicknesses suitable for the CAD/CAM tooth carving machines. The dental cobalt-chromium ceramic alloy disc material provided by the technical scheme has the advantages of smooth and clean surface, good compactness, no crack, good biocompatibility with a human body, good corrosion resistance, appropriate strength, hardness, extensibility and thermal expansion properties and good metal and ceramic powder bonding strength.

The invention belongs to the technical field of vehicle protection, and relates to an arched composite alloy protection plate module and a production technology thereof. The arched composite alloy protection plate module is arched and mainly composed of metal matrixes and a metal mesh, and the metal mesh is composited in the metal matrixes. The arched composite alloy protection plate module is produced with an FV casting technology. The production technology includes the steps: (1) producing a full mold, and using polystyrene foam beads for forming a protection plate template by foaming; (2) coating the template of the protection plate module with fireproof paint, and after drying, placing the dried template into a vacuum casting box for vacuumizing prior to molding by casting; (3) subjecting the arched composite alloy protection plate module molded by casting to heat treatment, and sequentially performing annealing, normalizing and tempering. Vehicle bodies are sufficiently protected against damage caused by shock waves of explosive, personal safety of passengers is protected sufficiently and effectively, and particularly effect in protecting against the explosive less than 10 kilos is better.

The invention discloses a high-purity bismuth-lead alloy and a preparation method thereof. The preparation method comprises the steps that a compounding step is carried out, specifically, according tothe composition design of the bismuth-lead alloy, massive lead materials and bismuth materials are used as raw materials for compounding and mixing; a smelting step is carried out, specifically, themixed raw materials are smelted under vacuum; a cooling step is carried out, specifically, alloy melt obtained after smelting is subjected to cooling; a filtering step is carried out, specifically, the alloy melt after cooling is subjected to filtration treatment; and a casting step is carried out, specifically, the filtered alloy molt is casted into a mold under vacuum and cooled to obtain an alloy ingot. According to the high-purity bismuth-lead alloy and the preparation method thereof, through the combination of high-temperature vacuum melting and low-temperature vacuum casting, oxides andother metal impurities in the lead and bismuth raw materials can be efficiently and advantageously removed, so that the purity of the alloy reaches above 99.998%. And through timing electromagnetic stirring and controlling of the weight of a single alloy ingot, the overall composition of the alloy is uniform and controllable, and the problem of excessive composition segregation is avoided.

The invention discloses a preparation method for a zirconium-copper thick-wall straight cylindrical part through cold power spinning, and particularly relates to the technical field of material forming. According to the technical scheme, a stop device, a zirconium-copper material, a spinning roller, a core mold and a main shaft are included, and the preparation method specifically comprises the following working procedures of S1, firstly, calculating a feeding volume according to the thickness T, the length L and the process allowance of a target product, and performing vacuum casting on raw materials to obtain a casting blank; and S2, freely forging the casting blank. The preparation method for the zirconium-copper thick-wall straight cylindrical part through cold power spinning has the beneficial effects that the forging process limitation is avoided, and the characteristics of the spinning process are fully utilized; the machining quality and precision of the part are improved, and the preparation method has the effects of improving the utilization rate of the zirconium-copper material and the production efficiency and reducing the manufacturing cost.

The invention discloses a short-flow preparation method of an aluminum-containing titanium alloy. Common titanium sponge or titanium-based sponge alloy (which is prepared by metallurgy of titanium, aluminum, tin, molybdenum and the like, alloying of titanium, aluminum, tin, zirconium, molybdenum and the like and merging in one technological process) is used as a raw material, and a low-cost and high-quality titanium alloy cast ingot is obtained through one-time smelting and casting by adopting an electron beam or plasma or induction or vacuum self-consuming electric arc smelting technology. The raw material cost is low, a multi-component alloy element preparation process required by a traditional process is omitted, a repeated remelting casting (casting for 2-4 times) process of a titanium alloy ingot is omitted, the process is simplified, the flow is shortened, the casting cost is reduced, and the casting efficiency is improved. As the high-temperature and high-vacuum casting times are reduced by about 70%, the oxidation and volatilization loss of aluminum, tin, manganese and the like is greatly reduced, alloy components are easier to control, and the quality of the cast ingot is greatly improved.

The invention relates to a low-zirconium mullite draft tube brick and a preparation method thereof, belonging to the field of refractory materials. The low-zirconium mullite draft tube brick comprises the following raw materials by weight: 45 to 55 parts of fused mullite, 15 to 25 parts of zirconia, 3 to 8 parts of Guangxi white mud, 15 to 25 parts of andalusite, 2 to 5 parts of kyanite and 1 to 5 parts of lignin. According to the invention, through selection of types and particle sizes of the raw materials and cooperative usage of sintering temperature and time provided by the invention, the prepared draft tube brick has the characteristics of excellent anti-scouring performance and high temperature resistance, small creep deformation, good thermal stability, etc. and is applicable to vacuum casting of large steel ingots in a nuclear power product.

The invention relates to narrow-hardenability industrial gear steel. A steel plate comprises the following chemical components of, by weight percentage, 0.15% to 0.19% of C, 0.22%-0.30% of Si, 0.55%-0.75% of Mn, 1.65%-1.85% of Cr, 0.25%-0.35% of Mo, 1.40%-1.70% of Ni, S<=0.005%, P<=0.015%, 0.05%-0.15% of Cu, 100-160 ppm of N, the balance being Fe and unavoidable impurities. The invention further relates to a production method of the high-end narrow-hardenability industrial gear steel. The production method comprises the steps of converter tapping, refining, VD high vacuum, casting and continuous casting. The narrow-hardenability industrial gear steel and the production method meet city rail and high-speed rail speed reducer gear steel end quenching performance requirements.

The invention relates to the field of material processing and discloses a preparation method of Co-Cr-Mo-N alloy. The preparation method comprises the steps of vacuum melting - vacuum casting - heat treatment - rolling - cutting. The Co-Cr-Mo-N alloy is vacuum melted and cast, heated to the temperature of 1,150-1,350 DEG C and rolled into a star shape, wherein the single rolling amount is 10%-18%,and the finish-rolling diameter is 8-10mm. According to the preparation method, a rolling method is used for processing the Co-Cr-Mo-N alloy to form a slender rod, the processing technology is simple, processing efficiency is effectively improved, a product is fine in structure, a bulky phase is crushed, density is improved, and the mechanical properties of the material are improved.

The invention relates to a manufacturing method of special spherical powder for additive manufacturing of a nanometer multiphase reinforced titanium-based composite material. The manufacturing method comprises the following steps that S1, an electrode bar is pressed by adopting raw materials of an alloy matrix and a reinforced phase; S2, vacuum casting is carried out to synthesize a cast ingot; S3, the cast ingot is subjected to machining of an electrode bar for powder preparation; S4, plasma rotating electrode method powder preparation is carried out on the electrode bar for powder preparation; and S5, the obtained powder are screened and packaged. The spherical powder for the titanium-based composite material manufactured through the method has the outstanding advantages of being uniform in reinforced phase distribution, high in purity, extremely few in hollow sphere and satellite sphere, concentrated in particle size, high in sphericity degree, excellent in fluidity, low in cost and the like; according to the method, in-situ synthesis and superfine net-shaped structure distribution of the nanometer reinforced phase inside spherical powder particles are successfully achieved, and the high-quality spherical powder is specially provided for electron beam selective melting and laser cladding method additive manufacturing of nanometer multiphase reinforced titanium-based composite material complex parts.

The invention belongs to the technical field of magnesium-lithium alloys, and particularly relates to a high-ductility soluble magnesium-lithium alloy and a preparation method and application thereof. Aiming at the problems of low ductility, incomplete dissolution and the like of a packing tool in fracturing transformation construction of an oil and gas field, the high-ductility soluble magnesium-lithium alloy is obtained through alloy component design and by adopting the processes of vacuum casting, low-temperature severe plastic deformation, heat treatment and the like, and the alloy is prepared from the following components in percentage by mass: 9.0-12.0% of Li, 0-2.5% of Al, 0.1-1.0% of Zn, 0.1-1.0% of Ni, 0.2-1.0% of Cu, less than or equal to 1.0% of RE, and the balance of Mg. The tensile strength of the prepared magnesium-lithium alloy is not lower than 120 MPa, the yield strength is not lower than 90 MPa, the ductility is not lower than 45%, and the magnesium-lithium alloy can be used for machining and preparing high-plasticity soluble downhole tools used in the oil and gas field fracturing process, such as all-metal full-bore soluble bridge plugs, sealing rings or sealing rings.

The invention relates to a porous structure bone cement screw design and a manufacturing method thereof. The method comprises the following steps that (1) a three-dimensional model of a screw is designed, then, a model of a screw mold is exported, and next, layered slicing software is used for carrying out layered slicing on the model according to the set thickness; (2) the screw mold is printed out through a laser sintering technology; (3) in a vacuum casting machine, bone cement is cast in a vacuum way in the screw mold; (4) the bone cement is taken out from the vacuum casting machine after being completely cured, and the still standing is carried out for a period of time, so that the mold is uniformly cooled in the air; (5) the screw mold filled with the bone cement is solved into a solvent so that the screw mold is dissolved, and finally, a formed porous bone cement screw is obtained. The porous structure bone cement screw design and the manufacturing method solve the problem that bone cement biological materials cannot be used for preparing product parts, and the application range of the biological materials is enlarged. The invention first provides the porous structure design of a medical screw, the fast recovery of the fracture bone can be promoted, and the secondary injury to the bone caused by the traditional medical screw after the operation is avoided.

The invention relates to the technical field of metal casting, in particular to a continuous vacuum casting device and method for silver alloy. The device comprises a vacuum cavity and a crystallizer. A crucible is arranged in the vacuum cavity. A heating device is arranged on the wall of the crucible. A liquid silver outlet is formed in the bottom of the crucible and communicated with the crystallizer. A cooling device is arranged on the periphery of the crystallizer. A traction device used for dragging liquid silver to the crystallizer and dragging formed solid silver in the crystallizer out is arranged at the liquid silver outlet and located in the crystallizer and can move vertically in the crystallizer. The device is simple in structure and convenient to operate. Continuous vacuum casting of silver alloy can be achieved. According to the casting method, continuous silver alloy casting under the vacuum environment can be achieved, and the operation process is simple and easy to achieve.

The invention relates to the technical field of alloy casting and discloses an alloy composition of a casting side guide plate. The invention comprises the following steps of preparation of a pre-coated sand model, wherein 100 parts of crude sand, 2.5-4.5 parts of resin, 1.5-2.5 parts of a solvent, 0.3-0.6 part of a curing agent, 0.2-0.4 part of insulation agent and 1-3 parts of clay are selectedas raw materials according to a shape of a work piece to be cast. The alloy composition of the alloy casting side guide plate has the beneficial effects that an annealing treatment and a subzero treatment of titanium alloy are rationally coordinated with a processing procedure, so that residual stress generated during each course in titanium alloy part manufacture links can be released to the hilt, and size stability of titanium alloy parts is enhanced; through combination of a freezing casting method and a vacuum casting method, a steam cushion is formed on the surface of a casting cavity effectively with ice as a binding agent, so that a casting with a very smooth surface can be obtained without use of a coating and alloy liquidity is enhanced under a vacuum effect, an average thicknessof the casting is reduced, and a processing amount of the casting surface is reduced.

The invention belongs to the technical field of new materials, and particularly relates to a preparation method of a high-strength and high-conductivity Cu-Ag alloy microwire. The preparation method comprises the following steps: preparing a Cu-Ag alloy cast rod by adopting a down-drawing vacuum casting method; continuously extruding the obtained Cu-Ag alloy cast rod, so as to obtain a rod blank of which the diameter is greater than or equal to 4 mm; and carrying out multi-mold cold drawing on the rod blank and carrying out drawing again after annealing, so as to prepare the Cu-Ag alloy microwire of 0.016-0.055 mm. According to the preparation method, a wire-drawing round rod is prepared through vacuum down-drawing continuous casting and continuous extruding methods; on the one hand, the purity of the round rod is guaranteed; on the other hand, the follow-up wire drawing strength is improved by continuously extruding large-deformation refined crystal grains; the tensile strength of the microwire is higher than or equal to 700 MPa; the electric conductivity is higher than or equal to 75% IACS; the material utilization rate is high; and the industrialized large-scale batch stable production can be achieved.