75results about How to "Lower pouring temperature" patented technology

The invention discloses an aluminum alloy investment casting method adopting near liquidus pouring. The method comprises the following steps: preheating a mould shell to be close to the liquidus, performing near liquidus temperature pouring, and meanwhile, reducing the pouring temperature, and pouring after the melt temperature is higher than the temperature of the liquidus; after finishing pouring, immersing the mould shell into the cooling liquid at a certain speed, thereby effectively and accurately controlling a solidification process of the casting; quickening the cooling of the casting, thereby acquiring the high-quality aluminum alloy casting with uniform structure and small grain. In the casting solidification process, the temperature gradient can be accurately controlled, the lower part of the casting is firstly soaked into the cooling liquid and the upper part is still in the heating atmosphere and under the molten state, so that the casting can be solidified from bottom to top, the solidified part is subjected to full liquid feeding, the casting is compact in structure, and meanwhile, the casting stress in the solidification process of each part of the casting is eliminated. The method provided by the invention is fit for common aluminum alloy casting and large-size, thin-wall and complex aluminum alloy investment casting.

The invention discloses an A2.0 B04 grade autoclaved aerated concrete block prepared from quartz eroded sand. The A2.0 B04 grade high-performance autoclaved aerated concrete block is prepared from quartz eroded sand, cement, quick lime, industrial waste phosphogypsum, aluminum paste and water. The dry density of the concrete block is 415kg/m<3>, the cube crushing strength average value is 2.1 MPa, the single unit minimum value is 1.9 MPa, the ratio of splitting tensile is 0.19, the frost quality loss is 3.7%, the frost strength is 1.7 MPa, the heat conductivity coefficient (dry state) is 0.116 W/(m.K), the dry shrinkage value (standard value) is 0.22 mm/m and the percent of pass is greater than 98%. The raw material processing method is reasonable, the formula calculation is scientific, the production process is simple and the production waste can be recycled. The concrete block is a novel energy-saving and environmentally-friendly wall material and is suitable for industrial process.

The invention discloses a steel ring billet casting technique based on casting and rolling combined forming. The steel ring billet casting technique based on casting and rolling combined forming comprises the steps that firstly, a casting mold is manufactured by means of water glass sand, the casting mold is dried and sprayed with painting, casting raw materials of a steel ring are smelted and are poured into the casting mold, and normalizing, tempering and quenching-tempering heat treatment are conducted on a steel ring billet formed through pouring; secondly, the steel ring billet is cooled to the room temperature, and polishing and machining are conducted on the cooled steel ring billet; finally, the steel ring billet which can be directly used for casting and rolling combined forming is obtained. According to the steel ring billet cast according to the technique, the defects, such as shrinkage cavities, shrinkage porosity and segregation, appearing in the steel ring billet casting process can be reduced, grains are refined to the maximum extent, and the high-quality steel ring billet capable of meeting the requirement for the ring rolling performance is manufactured; due to the fact that the processes of the casting and rolling combined forming technique are simplified, the quality and performance of the ring rolling technique and a ring workpiece are guaranteed.

The invention relates to an iron-based composite material and especially relates to a method for reducing pouring temperature of iron-based surface composite material through heat release of thermit reaction, wherein the principle is as follows: triggering the thermit reaction by heating molten iron, counteracting the cooling effect of a ceramic particle pre-forming block on the molten iron through the heat release part of the thermit reaction, and simultaneously forming an alloy having the ingredients the same as that of a high-chromium iron substrate through the thermit reaction; in order to generate no effect on the distribution of the ceramic reinforcement particles and improve the wearing resistance of the hexagonal prism hole or honeycomb hole part, the reactant of the thermit reaction is processed to a cylindrical shape and is added in the hexagonal prism hole or honeycomb hole of the ceramic particle pre-forming block, the reactant powder is mixed and is pressed to the cylindrical shape so as to conveniently process and apply the cylindrical reactant, and the reactant powder is wrapped by an aluminum foil to prevent the cylinder from being broken and prevent the reactant powder from dropping.

The invention provides an A3.5 B05 grade autoclaved aerated concrete block made of quartz weathered sand. The high-performance A3.5 B05 grade autoclaved aerated concrete block is made by using the quartz weathered sand, cement, quicklime, industrial waste phosphogypsum, aluminum powder paste and water as raw materials. The dry density of the block is 509kg/m<3>, the average cubic compressive strength of the block is 3.6MPa, the single component minimum of the block is 3.2Mpa, the split-to-compression ratio is 0.20, the mass loss after freezing is 2.8%, the strength after freezing is 3.1Mpa, the heat conduction coefficient (dry state) is 0.1251W/(m.K), the drying shrinkage value (standard process) is 0.32mm/m, and the qualified rate is greater than 98%. The method has the advantages of reasonable treatment of raw materials, scientific formula calculation, concise production flow, recycling of production wastes. The block is a novel energy saving and environmental protection wall material, and can be industrially produced.

The indirect extrusion and casting method is used in producing non-ferrous alloy casting. It is realized through low pressure filling of alloy melt via casting pipes, and extrusion with extruding head to make alloy melt solidify and crystallize under certain pressure to form extruded non-ferrous alloy casting in high yield.

The invention discloses a preparation method of copper-zinc composite plates and strips. The method comprises the following steps of 1) removing surface impurities of zinc ingots and then smelting the zinc ingots at 420-480 DEG C to obtain liquid zinc; 2) manufacturing the liquid zinc obtained in the step 1) into semi-solid slurry; 3) pouring the slurry obtained in the step 2) onto preheated copper plates and then performing rolling to obtain the copper-zinc composite plates and strips. According to the preparation method of the copper-zinc composite plates and strips, firstly, the liquid zinc is made into the semi-solid slurry and then metallurgically composited with solid copper under pressure, the bonding interface layer is relatively thin and thinner than 10 mu m, so that the problems of low strength of composite plates and large thickness of the bonding interface layers due to the preparation process of directly compositing the liquid zinc with the copper plates can be solved, the metallurgical bonding quality of the copper-zinc composite plates and strips can be improved significantly, the strength of the copper-zinc composite plates and strips can be effectively improved and continuous production can be achieved.

The invention discloses a new casting method, wherein, a casting mold with a pressurizing device is immerged in the inside of molten metal (8) for casting; the pressuring device is driven to carry out pressurization by utilizing lifting force and the gravity of the casting mold or other power. The molten metal in a die cavity (12) is filled, fed and solidified under necessary pressure during the lifting process, and then the casting mold is immerged in water for chilling so as to improve the mechanical property of castings. An upper mold (4) and a lower mold (10) of the casting mold are respectively provided with a plunger hole which is communicated with the die cavity (12) by a feeding cavity; the feeding cavity is slantingly arranged at the thickness changing site of the castings, and a driving mechanism is connected on the plunger to be matched with the plunger hole. The molten metal in the die cavity (12) is pressurized under the action of the driving mechanism, thus causing the castings to be filled, fed and solidified under single directional, double directional and multi directional high-pressure pressurizing. The method is suitable for the casting of various complicated aluminum alloy castings such as the cylinder of an auto engine, wheel hub and extra large thin wall aluminum alloy castings such as cruise missile hull with 0.8m in diameter, 6m in length and 6-8mm in thickness and various common castings.

The invention discloses a low-pressure filling method and device using electromagnetic stirring technology. The device includes a crucible furnace and a riser tube. The crucible furnace is provided with a furnace cover, so that the inside of the crucible furnace forms a sealed cavity. The top of the sealed cavity is communicated to the bottom of the cavity to be filled through a riser tube. An electromagnetic stirrer is provided beside the riser tube, and the crucible furnace has a pressurized gas inlet. Pressure is applied to metal melt in the crucible furnace to make the metal melt rise through the riser. Under the filling pressure, the metal melt enters the cavity smoothly until the entire cavity is completely filled. The temperature of the metal melt passing through the riser is 30 to60% of the liquidus temperature of the metal or alloy plus the width of its solidification temperature interval; As the metal melt flows through the riser, the metal melt is electromagnetically stirred. The device disclosed in the invention uses electromagnetic stirring to break up the generated dendrites, new crystal nuclei are added, the grain structure is refined, the pouring temperature is lowered, the mechanical properties of the casting can be improved, air intake and shrinkage of the casting can be reduced, and the casting quality and metal utilization rate can be improved.

The invention discloses a novel casting method and a casting mould thereof. The method comprises the following steps: the casting mould is immersed in molten metal(8) for casting, an upper pressure device and a lower pressure device are driven to be pressurized by utilizing the lifting force and the gravity of the casting mould, the molten metal is subjected to cavity fill, compensation shrinkage, solidification and crystallization in a mould cavity(12) at the needed pressure, and the casting mould is immersed in water for chilling, thereby improving the mechanical property of a cast. The mould is characterized in that an upper mould(4) is provided with the upper pressure device, a lower mould(10) is provided with the lower pressure device, an upper and a lower pressure plugs(1 and 9) pressurize the molten metal in the mould cavity(12) from the upper part and the lower part of the casting mould respectively, and an upper and a lower compensation shrinkage cavities(5 and 13) replenish the molten metal to the cast for eliminating shrinkage cavity and dispersed shrinkage phenomena. The novel casting method and the casting mould thereof can be used to cast various complicated thin wall aluminum alloy casts such as a cylinder cover of an engine and wheel hub of a vehicle and large-sized thin wall aluminum alloy casts such as a cabin body of a large-sized cruise missile, quickly cast a cast aluminum rotor of a motor with high quality and replace the prior casting method in large scale.

The invention belongs to the technical field of casting, and relates to a casting, a pouring method, application of the casting method, a casting method of an automobile wheel and the automobile wheel. The pouring method is characterized in that the pouring temperature is 645-660 DEG C, the lift pressure is 0.018-0.022 MPa, the lift time is 4-8 seconds, the mold-filling pressure is 0.023-0.027 MPa, the mold-filling time is 10-20 seconds, the boost pressure is 0.08-0.12 MPa, and the pressurization time is 3-8 seconds; after pressurization is completed, the pressure is kept under 0.08-0.12 MPa for 70-130 seconds; and a die is opened after pressure relief cooling. According to the casting, the casting method, the application, the casting method of the automobile wheel and the automobile wheel, the mechanical performance of the casting is improved, the defect of many pinholes on the casting is overcome, the production efficiency is greatly improved, and the casting period is shortened.

The invention discloses a production method for copper-aluminum high-temperature compounding. The production method comprises the following steps of (1) surface treatment of a copper strip; (2), electroplating and texturing treatment; (3) preparation of aluminum semi-solid slurry; (4) heat treatment and annealing; and (5) cold rolling. The method solves the problem that the copper-aluminum composite material is difficult to prepare due to the fact that the proportion of the copper layer obtained through an existing preparation method for copper-aluminum compounding is low, and also solves the problem that the peeling strength between the copper layer and aluminum layer of existing copper-aluminum compounding is low.

The invention discloses a method for realizing low superheat pouring of a continuous casting process by using a high-intensity magnetic field, and a device for the method. According to the method, a strong magnet produces the steady high-intensity magnetic field in metal melt, so the metal melt can still keep liquid state at the temperature of less than liquidus temperature when flowing through a water gap; the metal melt is in a supercooled state or a superheated state and is not solidified when flowing through the water gap, and the metal melt flowing out of an outlet at the bottom of the water gap is poured into a crystallizer in a supercooled or superheated mode. The invention also discloses a magnetic field intervention device for the low superheat pouring of metal liquid. The device comprises a superheat control system and a supercooling degree intervention system. According to the method and the device, the nucleation of the metal melt can be obviously inhibited by the steady high-intensity magnetic field, the supercooling degree of the melt can be improved, a large amount of isometric crystal textures can be obtained, the problem that the water gap is blocked easily in the low superheat pouring process can be avoided, the quality of casting blank can be improved obviously, equipment and the process are simple, and large-scale industrial production and application can be realized conveniently.

The invention relates to a method for the horizontal molding and vertical casting of a sand-coated steel cast of an iron-mold, the method includes the following steps: a, an upper mold plate and a lower mold plate are horizontally molded; a pouring head is arranged at one side of the mold plate; the pouring head is plugged by a steel plate for sand shooting; after that the sand shooting, the steel plate is taken away; b, after mold assembling, the iron mold is vertically arranged; the pouring head is led to face upwards and is arranged in a prepared frame; then casting is carried out. The technique is simplified in design and fully complements shrinking; the cast doses not generate a shrinkage cavity and a shrinkage porosity; besides, the yield is high and the casting temperature is relatively low, thus being beneficial for energy saving.

The invention provides a ceramic mould casting process for a magnesium alloy. The flow of the ceramic mould casting process for the magnesium alloy is as follows: carrying out female die treatment, brushing silicon rubber, vacuumizing, filling with gypsum, drawing a silicon rubber/gypsum die, preparing a hydrolysate, preparing a ceramic slurry, grouting, drawing the die, carrying out spray combustion, roasting, producing a sand mould, smelting the alloy, pouring, unboxing, inspecting, and setting die drawing time for spraying a refractory material according to the sizes of workpieces, wherein the die drawing time of the small workpieces is about 5 minutes, and the die drawing time of the large workpieces is about 20 minutes; the roasting temperature is 850 DEG C, the temperature rise speed is 3 DEG C/min, the insulation time is 1 hour, and organic matters are eliminated to prevent the reaction between the sand mould and the magnesium alloy. The ceramic mould casting process for the magnesium alloy enables the casting effect to be good, and the cast product is good in quality.

The invention discloses a method for burning a white mold module before vacuum lost foam casting. After the modeling is completed, cover the plastic film, vacuumize, and gradually burn the white mold module with a burning gun from the outlet of the module. The burning gun is fed with combustible gas and oxygen. In addition to ensuring the complete combustion of the combustible gas, the combustion-supporting oxygen must have excess gas. The oxygen guarantees the combustion of the module, and the outlet remains sealed during the entire combustion process and the subsequent pouring process. The invention eliminates casting defects caused by the vaporization residue of the lost foam model, reduces the pouring temperature, improves the product qualification rate, and simplifies the process parameters of the vacuum lost foam casting.