306results about How to "Improve filling ability" patented technology

The invention discloses a cast magnesium alloy of low linear shrinkage, which belongs to the field of magnesium alloys. The magnesium alloy consists of Mg, Al, Zn, Mn, rare earth, Nb, Li and M element, wherein the materials have the following weight percentage composition: 1.5-25 percent of Al, 0.1-3.5 percent of Zn, 0.1-2.2 percent of Mn, 0.0002-16 percent of rare earth, 0.0002-4 percent of Nb, 0.0002-9 percent of Li, 0.0002-2 percent of M element and the balance Mg; and the M element is at least one of Zr, Ti, Sr, Ca, C and B. According to the heat-resistant magnesium alloy, the rare earth element and the Nb element are added into the magnesium alloy, so that the structure of beta phase is changed; the Zr element and the M element are added to refine crystal grains; due to combined action of the elements, latent heat of crystallization during alloy solidification is changed; and the magnesium alloy which has superior mold-filling capacity, low shrinkage, superior mechanical property and good machinability, fluidity and die-cast performance and is suitable for casting is obtained.

The invention relates to a method for quickly producing metal mould with laser sintering, which comprises: first, using at least two kinds of different metal powders with different diameters, to be mixed with different mass percentages; using physical or chemical modification to treat the surface of metal powder; then mixing the modified metal powders, the adhesive formed by organic resin and inorganic with different fusion points, and the lubricant uniformly to obtain the metal molding powder; then designing the three-dimension CAD mode of mould, to slice the mode, and laser sintering the metal molding powder; the laser sintered element is baked at 300-800Deg. C; using vacuum pressure penetration to penetrate the metal, to obtain the high-accuracy metal mould.

A multipurpose vacuum casting device comprises a smelting furnace and a set of vacuum pumping system communicated with an inner cavity of the smelting furnace. The smelting furnace is provided with a casting pull-down continuous casting molding system which is formed together with the smelting furnace, a vacuum smelting system used for melting metal and a vacuum casting system used for ingot casting molding. Due to adoption of only one set of vacuum pumping system and one smelting furnace, a plurality of purposes such as vacuum induction heating smelting, vacuum casting, vacuum smelting and continuous casting under protection of inert gas can be achieved, the number of device components is greatly reduced, structure of a device is simplified, manufacture cost of the device is decreased to a large extent, production efficiency and casted blank quality are improved, operation is convenient and failure rate of the device is reduced.

The invention relates to a casting method for casting the three-way ventilate branch tube of thin-wall iron element, which comprises: (1), using the curvature formed by the central line of C exhaust open and the central line of A exhaust tube, to make the C and A exhaust opens above the parting surface, to be shaped via upper and lower outer moulds; the tube core and sand core are put via the serial number, and it uses pour system that combines side pour and bottom pour with contract cap and cold iron; (2), preparing outer mould, core box, section sheet, pour cap, and the wood mould that checking sample plate; (3), preparing the casting element and sand core; (4), drying the casting element and the sand core, and closing the tank after arranging the sand core; (5), smelting and pouring; (6), cooling and molding; (7), cleaning the casting element; (8), thermally treating; (9), testing the water pressure. The invention can improve the quality of casting element, and improve the producing efficiency.

The invention discloses a luminant white paint. The luminant white paint is obtained by mixing a main paint, a curing agent and a diluent according to a mass ratio, wherein the main paint comprises the following components in parts by weight: 35-40 parts of alkyd resin, 3-5 parts of dispersing agent, 30-40 parts of titanium white powder, 10-20 parts of extender pigment, 0.2-0.5 parts of anti-setting agent, 0.2-0.4 parts of leveling agent, 0.2-0.5 parts of antifoaming agent, 0.5-1.0 parts of anti-yellowing agent and 20-25 parts of main paint solvent; the curing agent comprises the following components in parts by weight: 10-20 parts of curing agent solvent, 0.1-0.2 parts of dehydrating agent, 60-70 parts of HDI (Hexamethylene Diisocyanate) type curing agent and 30-40 parts of TDI (Toluene Diisocyanate) type curing agent; and the diluent comprises the following components in parts by weight: 60-70 parts of ester solvent and 30-40 parts of ketone solvent. The luminant white paint disclosed by the invention has the advantages of rapidness for leveling after being sprayed, full paint film, rockiness and scratch resistance. Meanwhile, the invention also discloses a preparation method of the luminant white paint.

The invention relates to a conductive screening material, in particular to a conductive low-smoke zero-halogen flame retarding and oil resisting cable sheath material and a preparation method thereof. The conductive screening material comprises the following basic components: 100 parts of ethylene-vinyl acetate rubber, 50-100 parts of magnesium hydroxide, 50-80 parts of conductive black, 10-30 parts of graphite powder, 5-10 parts of zinc borate, 10-25 parts of plasticizer, 2-5 parts of lubricant, 1-2 parts of antiager, 10-30 parts of flame retarding synergist, 2-3 parts of vulcanizer and 1-2 parts of vulcanization assistant. The preparation method comprises the four steps of material preparation, mixing, extrusion and tabletting. The conductive low-smoke zero-halogen flame retarding and oil resisting cable sheath material has the advantages of high conductivity, good oil resistivity, excellent flame retarding effect, no peculiar smell, easy stripping and high heat resistance level, and can pass the environment protection authentication of RoHS (Restriction of the use of certain Hazardous Substances Registration), REACH (Evaluation, Authorization and Restriction of Chemicals) and the like.

The invention provides an integrated device and method for conducting smelting and electromagnetic-ultrasonic coupled continuous casting on the vacuum condition and belongs to the field of metal casting. The integrated device comprises a first vacuum chamber, a second vacuum chamber, a vacuum control system, a material supplementing device, an ultrasonic treatment device and a throwing device. According to the integrated device and technology for conducting smelting and electromagnetic-ultrasonic coupled continuous casting on the vacuum condition, the device can be widely applied to horizontal continuous casting of a high-temperature alloy, a titanium alloy, a magnesium alloy, a rare earth metal, multi-component amorphous alloy, high-entropy alloy and other active alloys, smelting, pouring and continuous forming under electromagnetic and ultrasonic coupled fields of the alloys can be all completed in the vacuum state, and the obtained horizontal continuous casting alloy workpiece has the effects of being smooth and clean in surface, uniform in component and dense in structure.

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.

A moulding sand is prepared from zircon sand (or powder), graphite powder and water glass through proportionally and sequentially mixing. Its advantages are high surface quality of casting mould and high refractory performance.

The invention discloses a high-strength and high-toughness heat-treatment-free aluminum alloy material and a preparation method, and belongs to the technical field of aluminum alloy casting. The high-strength and high-toughness heat-treatment-free aluminum alloy material comprises the following components in percentage by mass: 8.0-10.5% of Si, less than or equal to 0.15% of Fe, 0.05-0.3% of Mg, 0.05-0.3% of Zn, 0.3-0.6% of Mn, less than or equal to 0.1% of Cu, 0.05-0.15% of Ti, less than or equal to 0.005% of Ca, 0.005-0.030% of Sr, 0.1-0.3% of Zr, 0.01-0.1% of Mo, 0.01-0.3% of V, less than or equal to 0.02% of Cr, less than or equal to 0.002% of Na, less than or equal to 0.002% of P, less than or equal to 0.01% of Cd, less than or equal to 0.001% of Li, less than or equal to 0.0025% of B, less than or equal to 0.05% of Ga, and the balance Al and inevitable impurities. The alloy does not need to be subjected to heat treatment, and has excellent casting performance and mold filling capacity and good tensile strength, yield strength and toughness.

The invention provides a high-counter-pressure casting method for a high-tensile and heavy aluminum silicon alloy, which relates to a counter-pressure casting method for the high-tensile and high-density aluminum silicon alloy. The invention solves the problem that the conventional counter-pressure casting technology cannot meet the requirement of producing castings with high mechanical properties and high density due to the limit on the density and internal quality increase of the castings. The invention has the following main steps of: regulating a counter-pressure casting machine to an operating bearing pressure of 3.0 MPa, preparing aluminum silicon alloy, controlling the temperature of the fusant after thinning and modification at 720 DEG C to 740 DEG C, and carrying out the liquid lifting, mold filling, pressurization, pressure maintaining and pressure relief of high-counter-pressure casting with the counter-pressure casting machine. The invention obviously eliminates internal pinholes, micro-shrinkage porosity and tiny cracks in the castings, and enhances the mechanical properties and density of the castings; because of small thermal resistance between the fusant and the mold wall, the setting rate of the castings accelerates, and the setting structure is obviously thinned, thereby further enhancing the mechanical properties of the castings. The method is especially suitable for the cast form of large-sized complex thin-wall parts.

The invention discloses a centrifugally-cast burr cylinder sleeve and a preparation method thereof, and belongs to the field of cylinder sleeves. The centrifugally-cast burr cylinder sleeve comprises,by weight, 2.8%-3.7% of carbon, 0.03%-0.08% of sulfur, 1.7%-2.8% of silicon, more than zero and no more than 0.5% of phosphorus, 0.5%-1.0% of manganese, more than zero and no more than 0.4% of chromium, 0.1%-0.6% of copper, and the balance iron. A-type graphite is no less than 80% in the metallographic phase of the cylinder sleeve, the length of the A-type graphite is at 4-7 grades, the matrix structure is fine lamellar pearlite, ferrite is no more than 3%, the amount of carbide and iron phosphide eutectic is no more than 5%, and the carbide and the iron phosphide eutectic are in discontinuous network distribution or even distribution. Customer requirements to mechanical performance can be met, the condition of pull of the inwall of a pipe mould is reduced obviously, the life of the mouldis prolonged greatly, and the processing performance of the cylinder sleeve is better.

The invention discloses a hard aluminum alloy for metal die casting of a precision electronic product structural member. The hard aluminum alloy is prepared by antigravity metal die casting and natural ageing heat treatment. The hard aluminum alloy comprises, by mass, 21-30% of zinc, 5.7-7.2% of silicon, 2.0-2.4% of copper, 0.17-0.35% of manganese, 0.2-0.6% of trace alloy element and the balance aluminum and unavoidable impurities with iron content of 0.27% or less. The invention also discloses a preparation method of the hard aluminum alloy. The hard aluminum alloy can be prepared by high precision die casting, has high strength, can be subjected to high quality surface treatment, can be used for production of a high precision structural member of small, thin and light electronic products, and is suitable for large parts of spaceflight and aviation, automobiles, high-speed railway, steamships and yachts and daily hardware products.

The invention relates to a process method for preparing a high-temperature alloy miniature precision casting part. The method comprises the following steps: preparing a wax model or a resin type model after waxing processing of the miniature precision casting part, then, placing the wax model or the resin type model after waxing processing in a dip-coating chamber, taking the silicon-dioxide-based or the alumina-based coating as the surface layer coating, performing vacuum dipcoating, drying in the room temperature air, and then sealing slurry, drying, dewaxing and burning after the conventional coating working procedure to obtain a formwork; then putting the formwork preheated at the high temperature in a casting chamber of a vacuum melting furnace for casting to obtain a miniature casting part with a formwork; and finally, putting the miniature casting part with the formwork in a formwork removal device for formwork removal and post processing to obtain a finished product. The invention has the advantages that the formwork of the miniature casing part can be easily prepared by adopting a vacuum dipcoating process and an additional conventional coating process, and the casting part has good filling capacity; the integrality of the casting part can be ensured by removing the formwork by a chemical method; and the miniature casting parts can be prepared at a large scale.

The invention relates to a coating for sand mold casting of a rare earth magnesium alloy-coated sand and a using method thereof, the weight percentages of raw materials of the coating are: 2 to 20 percent of zirconium oxide, 3 to 15 percent of boric acid, 2 to 10 percent of chalk powder, 0.5 to 6.5 percent of water glass, 0.5 to 5 percent of graphite powder and the rest of water. The coating is prepared by the preparation step of the components. The coating can be directly carried out the brush coating or spray coating by a spray gun on the sand mold surface of the coated sand according to sand mold cavity surface temperature, thus inhibiting and reducing the reaction of the rare earth magnesium alloy melt and the sand mold, raising the pre-heating temperature of the coated sand mold, improving the mold filling ability of the alloy melt, improving the molding performance of the rare earth magnesium alloy and significantly improving the surface quality and the internal quality of a cast, which can particularly play the obvious effect of the thin-walled cast, the production process of the coating is simple, the usage has no harm to the human body under the room temperature and has no environmental pollution.

The antigravity vacuum sucking cast apparatus for aluminum base composite material used in casting field includes smelting plant, vacuum sucking cast plant and gas path. The smelting plant has stirrer, crucible stage, protecting gas channel, heat insulating layer and radiation-proof layer in the crucible mouth. The vacuum sucking cast plant has partition plate with sealed sleeve, riser tube and sealing washer, backing board, shuttering fixing jacket, shuttering, hoisting hook and ring, and vacuum channel connected to the gas path. The gas path has vacuum pump connected via the first cut-off valve to the vacuum tank, vacuum outlet and gas exhaust outlet connected via throttle valve and the second cut-off valve to the vacuum tank and vacuum gauge. The present invention has simple structure and convenient operation, and may be used in industrial production.

The invention discloses a casting method of a ZL101 thin-wall aluminium alloy part. The method includes steps of: 1) preparing moulding sand raw materials; 2) preparing binder slurry, wherein the binder slurry comprises 36-40% by weight of starch, 6-8% by weight of furan resin, 14-16% by weight of calcium bentonite, 3-5% by weight of bagasse cellulose powder having a size of -100 meshes, 1-2% by weight of zinc stearate and 2-3% by weight of sodium tripolyphosphate, with the balance being water; 3) preparing moulding sand; 4) manufacturing a casting and gating system; 5) smelting a ZL101 alloy, wherein 0.035% of Sr is added for modification, argon is fed after slag removal, gas removal is performed by rotation, smelting is performed when the temperature is 735-745 DEG C, and the alloy is allowed to stand for 10-12 min after smelting; 6) casting, wherein the aluminum alloy casting temperature is controlled to e 720-730 DEG C, and the casting speed is controlled in a manner that the former two fifth of the total casting amount adopts a speed of 6-8 kg/s, the middle two fifth adopts a speed of 4-5 kg/s, and the last one fifth adopts a speed of 6-8 kg/s; and 7) cooling with the mould, opening the mould, cleaning and performing thermal processing.