48results about How to "No casting defects" patented technology

The invention discloses a method for manufacturing a casting blank of a die for inner containers of household appliances on the basis of a metal cavity with a cold iron structure, and relates to the technical field of aluminum alloy casting. The method includes particular steps of constructing an outer cavity by cold iron blocks on the periphery of a manufactured wood mold in a form following manner; filling gaps among the cold iron blocks by clay sand, tightly filling the corresponding cold iron blocks by clay sand after each local structure is completed, and compacting a sand mould to prevent the cold iron blocks from moving; constructing a sand core of an inner cavity by the same method after the outer cavity is constructed; opening a case to take out the wood mould after the sand core of the inner cavity is manufactured so that a cavity of a casting is formed; drying the cavity of the casting and the sand core consisting of clay sand; preheating the cavity of the casting at the preheating temperature of 200 DEG C before pouring of the cavity of the casting; casting melted aluminum alloy into the cavity of the casting; and opening the case to take out the casting after the cavity of the casting is cooled naturally. The method is mainly used for casting the die for the inner containers of the household appliances, the surface of a casting product produced by the process is high in smoothness and does not have sand holes or pin holes after the surface of the casting product is treated in a follow-up machining process, and accordingly yield of molded inner container products is greatly increased.

The invention relates to an aluminum piston manufacturing method, which is characterized by comprising the following steps: (1) preparing an aluminum alloy for a piston; (2) carrying out a smelting treatment, wherein the prepared piston alloy is placed into a melting furnace to carry out melting, and the melted aluminum alloy liquid is subjected to primary refining, modification, refinement and secondary refining to provide a spare use for casting; (3) manufacturing an alumina ceramic short fiber preform; (4) preheating the alumina ceramic short fiber preform; (5) preheating a mold; (6) carrying out extrusion casting; (7) carrying out solidification piece taking; (8) carrying out a heat treatment on an aluminum piston blank; and (9) carrying out mechanical processing and a surface treatment on the aluminum piston blank to obtain the aluminum piston finished product. Compared to the aluminum piston in the prior art, the aluminum piston of the present invention has advantages of high strength and good ablation resistance.

The invention relates to the technical field for processing the shell of the electronic products, in particular to a processing method and a device of electronic product of bulk amorphous alloy. The method and the device of the invention overcome the disadvantages of the existing shell processing technique of electronic product of bulk amorphous alloy, which is a complex processing method, being difficult to remove casting defect, being forbidden from making the thickness of the wall too thin and the product being unable to meet higher demand on loading, etc. The processing method is especially applied to processing thin shell components of electronic products of 3C class such as laptop computers, hand-held video cameras, digital cameras, cell phones, personal digital assistants (PDA), MP3 (MP4), U disks, etc. By utilizing the viscous flow in super-cooled liquid region of the bulk amorphous alloy, the alloy is made to be deformed and stuck to the inner wall of the concave module to complete the formation of the thin shall component. The processing device of the invention comprises an upper plate, a rough plate of the bulk amorphous alloy, a concave module, etc., wherein, the rough plate of the bulk amorphous alloy is arranged between the upper plate and the concave module and deformed under the combined action of compressed air in the upper plate and the vacuum of the inner cavity of the concave module. The invention has simple structure, convenient operation and no casting defect being difficult to be removed.

The invention provides a bimetal wear resistance composite tube, which comprises a carbon steel layer in an outer layer and a wear resistant high-chromium cast iron layer in an inner layer; the carbon steel layer is made of one of three materials of ZG15, ZG25 and ZG35; and the wear resistant layer is made of one of three materials of KMTBCr26G, KMTBCr20MoG and KMTBCr15MoG. The composite tube is one of a straight tube, an elbow tube, a tee tube, a four-way tube and a special tube. The composite tube has the advantages of jointly utilizing the characteristics of the carbon steel and the high-chromium cast iron, solving the problems of wear resistance and toughness, having low cost, and also solving the unsolvable contradiction of weldability and wear resistance existing in the composite tube adopting the single material, along with long service life and convenient transportation, assembly and use.

The invention relates to a manganese alloy sputtering target material and its manufacturing method. The target material is made of one or more of Pd, Pt, Ir, Au, Ru, Os, Rh and Re, and Mn, the mass content of Mn in the alloy is 2-80%, the deviation between the content of Mn in the alloy and a nominal composition is -0.2%-0.2% by mass, the content of O in the target material is below 200ppm, the purity of the target material is 99.9%-99.999%, the lowest surface roughness Ra is 0.8mum, the warp is below 0.1mm, and the target material has a fine and uniform structure. The target material has the advantages of accurate and uniform components, high compactness, accurate dimension and high surface quality; and the manganese alloy sputtering target material having excellent performances is prepared through adopting a melting technology and a machining process to prepare target materials of the alloy system in a low-cost and large-scale manner in a shortest possible flow, and overcoming a material preparation difficulty easily appearing in the preparation process of the alloy and a processing difficulty brought by high alloy crispness.

The invention discloses a design method of a sand core chilling block combined structure. The design method comprises the following steps that a, a chilling block is manufactured according to a casting process scheme and casting structure requirements; b, design drawings of a matrix sand core and a combined sand core are completed according to the casting process scheme and the casting structure requirements, and the combined sand core comprises the chilling block and a secondary sand core; c, the matrix sand core is manufactured according to the design drawing of the matrix sand core; d, thecombined sand core is manufactured according to the design drawing of combined sand core, when the combined sand core is manufactured, the chilling block is placed at first, and then the secondary sand core is manufactured; and e, the combined sand core and the matrix sand core are bonded together through a bonding agent. According to the method, the combined sand core is manufactured in the modethat the chilling block is placed at first and then the secondary sand core is manufactured, and thus the problem that the chilling block is difficult to place due to pattern draft, dimensional deviations, flashes of the chilling block and the like can be solved.

The invention discloses a hub casting and forming technology and relates to the field of automobile spare part casting. The hub casting and forming technology comprises four technology steps of aluminium alloy melting stock preparation, melting, casting and cooling and forming. The process route is simple; the process conditions are easy to meet; the appearance of a casting which is cast has no casting flaw, no pore and no impurity; the internal tissue is compact; the quality of a hub can be ensured; the service life is prolonged; and the economical benefit is improved.

The invention relates to a water turbine sleeve casting mould assembling box, comprising a sand box. Sand moulds are uniformly arranged in the sand box; a casting part is arranged in the sand box; the upper end of the casting part is provided with an annular casting head; an air outlet hole is arranged between the casting head and the upper end of the sand box; a sand core penetrates through the air outlet hole, the casting head and the casting part; the upper end of the sand core is arranged at the outside of the sand box; the lower end of the sand core passes through the casting part and is arranged in the sand box; a core tube is arranged in the sand core; the lower end of the sand core is provided with a horizontally placed side gate; a first flow gate is arranged between the side gate and the lower end of the casting part; one end of the side gate is provided with a vertically placed sprue gate; the upper end of the sprue gate is connected with a pouring cup penetrating through the sand box; the upper end of the pouring cup is arranged outside the sand box; and a plurality of second flow gates placed obliquely are arranged between the outer wall of the casting part and the sprue gate. The water turbine sleeve casting mould assembling box has the advantages of reasonable structure and convenience for modeling, and guarantees an internal circle machining face of a sleeve without casting flaw.

The invention discloses a hot rolling machine for a vehicle wheel. The hot rolling machine comprises a frame, a heating propelling mechanism and a die head propelling mechanism are mounted on the frame, the heating propelling mechanism is provided with a heating device, a front end of the die head propelling mechanism is rotationally connected with a die head, the bottom of the frame is provided with a jacking platform, and a rotation platform is arranged above the frame corresponding to the jacking platform. The vehicle wheel produced by the hot rolling machine for the vehicle wheel has no casting defects, and product quality is high.

The invention discloses a large vibration force large amplitude vibrating squeeze casting method and a casting device thereof. The large vibration force large amplitude vibrating squeeze casting method comprises extending a vibrating rod inside a casting mold and enabling a movable mold and a stationary mold of the casting mold to form into a mold cavity when casting is required to be performed; injecting formed metal materials into the mold cavity; applying large vibration force large amplitude vibration pressure to the vibrating rod to enable the squeezing force of the formed metal materials to be changed into dynamic squeezing force to enable vibratory pressing to be performed on the formed metal materials inside the mold cavity and accordingly forming into the vibrating pressure filed in the formed metal materials to enable vibratory compression to be performed on the formed metal materials inside the mold cavity and obtaining required high density shrinkage-cavity-shrinkage-defect-free casting products. The large vibration force large amplitude vibrating squeeze casting method has the advantages of having advantages of the existing vibrating device, meanwhile enabling the device tonnage to be reduced substantially, greatly reducing consumption and simplifying a control system and a hydraulic system substantially.

The invention discloses a semisolid centrifugal separating casting ball grinding process, a process device and a ball casting machine. Returns serve as raw materials, and a metal liquid is processed into metal semisolid slurry conforming to requirements in a casting ladle and the ball casting machine, so that high-quality ball grinding can be achieved; and the metal liquid is subjected to evaporative cooling, so that the semisolid centrifugal separating casting ball grinding process can be actually applied in industrial production, however, if a short-flow process is to be adopted, a production line is required to be formed by a plurality of ball casting machines in a group casting mode, and the yield of the production line can be improved exponentially.

The invention discloses a high-speed semicontinuous casting device of an aluminum alloy cast ingot, and belongs to the technical field of aluminum alloy casting. The device comprises a hot top, a crystallizer inner sleeve, a crystallizer outer sleeve, a cooling water cavity and a dummy bar head. A secondary cooling water cut-off device is arranged below the crystallizer inner sleeve, and a grease metering valve is arranged at an inlet of each oil conveying pipe below the crystallizer outer sleeve. A method comprises the steps that aluminum alloy melt is cast for semicontinuous casting, and lubricating oil is conveyed; (2) the semicontinuous casting speed is controlled to range from 200 mm / min to 400 mm / min, secondary cooling water is sprayed to the surface of the cast ingot, and the conveying amount of the lubricating oil is increased along with the casting speed; (3) the surface temperature of the cast ingot is detected; (4) the secondary cooling water cut-off device is controlled according to the surface temperature of the cast ingot; and (5) operation of the step (4) is repeated till casting is completed. According to the device and the method, the casting speed is greatly increased, the surface quality of the cast ingot is improved, the cast ingot has no casting defect, and the microstructure is uniform.

The invention discloses a main oil duct sand core of a diesel engine frame and a manufacturing method thereof. The main oil duct sand core comprises a main core body and a main oil duct sand core bodyarranged on the main core body; the main oil duct sand core body is divided into a plurality of oil duct sand core subsections with the center of each gear of crank as the parting surface according to the number of cylinder bodies of the diesel engine frame; each oil duct sand core subsection is composed of a core rod and a sand body wrapping the core rod; positioning core heads are arranged at one ends of the oil duct sand core subsections, and positioning core grooves are formed in the other ends of the oil duct sand core subsections; the positioning core heads of the front oil duct sand core subsections are inlaid in the positioning core grooves of the rear oil duct sand core subsections for connection; and the main oil duct sand core further comprises two side core heads arranged at the front and rear ends of the multiple connected oil duct sand core subsections. Through the sectioning casting technology of the main oil duct sand core, the perpendicularity and concentricity of a main oil duct are guaranteed, and the casting defect of leaking in pressure testing is overcome thoroughly.

The invention discloses a casting method of a large two-plate type injection molding machine mold plate casting. The casting method comprises the following steps that sand casting is carried out to form a casting cavity body and a pouring structure; raw materials comprise 35%-45% of pig iron, 30%-35% of scrap steel, 20%-35% of foundry returns and a carburant accounting for 0.6%-1.0% of the total amount of the pig iron, the scrap steel and the foundry returns, and the raw materials are put into a smelting furnace to be heated to melt furnace burden; spheroidizing is carried out by adopting a pouring method, then pure antimony accounting for 0.003%-0.005% of the mass of original molten iron is added, and finally an inoculant with the particle size of 3-8mm is added and compacted; the molten iron is subjected to slagging-off, inoculation blocks are placed for unstable silicon inoculation, standing is conducted, and the adding amount of the inoculation blocks accounts for 0.2%-0.4% of the mass of the molten iron; when the temperature is reduced to 1270-1360 DEG C, the molten iron is poured into the casting structure to form a casting; and after the casting is cooled, the casting of the application is obtained. The method has the advantages that according to the large two-plate type injection molding machine mold plate casting, an indirect chilling block which is convenient and accurate to position, and improves the cooling effect is contained, and the casting defects such as graphite distortion, shrinkage cavities, shrinkage porosity and sand inclusion can be reduced, so that the mechanical property of the casting is improved.

The invention discloses a vertical roll collar used for the head of a high speed heavy rail and a manufacturing technique thereof. The technique comprises the following steps that step I, the chemicalcomponents of the vertical roll collar are determined: 2.55-2.95% of C, 0.50-1.0% of Si, 0.35-0.65% of Mn, 3.5-3.85% of Cr, more than or equal to 0.35% of Ni, 1.6-1.95% of Mo, 9.0-9.5% of V, more than or equal to 0.3% of Co, less than or equal to 0.030% of P, less than or equal to 0.025% of S, less than or equal to 0.03% of Al, more than or equal to 0.15% of Re and the balance of Fe and inevitable impurities; step II, centrifugal casting is performed, namely smelting is performed through an electric arc furnace, so that the chemical components of molten steel meet requirement; and before steel tapping, aluminum blocks and glass slags are used for deoxidation and anti-oxidation; step III, a blank is subjected to thermal unpacking at 450-550 DEG C; then the blank enters a thermal treatmentfurnace for annealing immediately; the blank is subjected to thermal treatment after coarse machining; and then the blank is inspected to obtain a qualified high-vanadium high-speed steel product. Thevertical roll collar is made of the high-vanadium high-speed steel, so that the abrasion resistance and heat-cracking resistance of a roll are improved.

The invention relates to the technical field of valves, in particular to an angle type duplex ball valve for a nuclear submarine and a using method thereof. The angle type duplex ball valve comprisesa valve body, a pipeline is arranged inside the valve body, the pipeline is connected with a first ball body and a second ball body, sealing rings are arranged at the joint between the first ball bodyand the pipeline and the joint between the second ball body and the pipeline correspondingly, a first valve deck and a second valve deck are arranged at the upper end of the valve body, a first bearing penetrating through the first valve deck is arranged at the upper end of the first ball body, a hydraulic oil cylinder is arranged at the upper end of the first bearing and connected with the firstvalve deck through screws, a second bearing penetrating through the second valve deck is fixedly arranged at the upper end of the second ball body, a worm reduction gearbox is fixedly arranged at theupper end of the second bearing and connected with the second valve deck through screws, a worm is arranged on the worm reduction gearbox, and a rotating wheel is fixedly arranged at the outer end ofthe worm. According to the angle type duplex ball valve for the nuclear submarine and the using method thereof, a top-mounted structure is adopted, and two pure mechanical valve balls are adopted forcontrol, so that the opening and closing performance is safe and reliable, and the size of the valve is more compact.

The invention discloses a water cooling turbine shell. The water cooling turbine shell comprises a shell body which is internally provided with a water cavity. The water cooling turbine shell also comprises a straight pouring channel, a transverse pouring channel and inner pouring channels. The straight pouring channel is arranged on one side of the shell body and is perpendicular to ground. The transverse pouring channel is arranged on one side of the shell body and is parallel to the ground. The straight pouring channel is connected with the transverse pouring channel and the transverse pouring channel is connected with the inner pouring channels. The number of the inner pouring channel is two. The inner pouring channels are connected with the shell body. A chill block is arranged in aninner hole of the shell body. The invention also provides a casting technology of the water cooling turbine shell. According to the water cooling turbine shell and the casting technology thereof, theproblem of low production rate of the water cooling turbine shell is solved; casting cost is lowered; the effect of sequential solidification from interior to exterior is achieved; casting defects arenot caused in a casting piece; a feeding head with heavy weight is omitted; the production rate is high; and production cost of the casting pieces is effectively lowered.

The invention relates to an ultrasonic-assisted preparation method of a 2219 aluminum-based high-entropy alloy composite material. The mass of each component is calculated according to the molar atomic ratio and mass fraction of each element of an AlCoCrFeNi high-entropy alloy, powder of each component is weighed according to the quantity, and after uniform mixing, ball milling is carried out to prepare AlCoCrFeNi high-entropy alloy particles; the AlCoCrFeNi high-entropy alloy particles are weighed for standby application according to the prefabrication proportion of reinforced phase particles in the composite material; a 2219 aluminum alloy material is weighed, heated and subjected to heat preservation, and 2219 aluminum melt is obtained; the AlCoCrFeNi high-entropy alloy particles are added into the 2219 aluminum melt; a preheated ultrasonic tool rod is inserted into the aluminum melt to carry out ultrasonic vibration treatment; after vibration application is finished, the ultrasonic tool rod is taken out, the melt is poured into a preheated square stainless steel mold, flowing water cooling is carried out, and a 2219 aluminum-based composite material ingot is preliminarily obtained; and the cooled composite material ingot is put into a homogenizing furnace to be heated and subjected to heat preservation, homogenizing annealing treatment is carried out, and the final 2219 aluminum-based AlCoCrFeNi high-entropy alloy composite material is obtained.

Provided is a machining method of a metallurgical furnace launder. A mode that plate blank forging and machining are combined is used for machining. The method comprises the following steps that forged plate blanks are forged and pressed into a metallurgical furnace launder semi-finished product with an arc face; and a metallurgical furnace launder component semi-finished product is subjected to finish machining to form a metallurgical furnace launder finished product. The machined metallurgical furnace launder finished product comprises a launder body. The launder is formed in the top of the launder body. A plurality of cooling water channels are arranged in the launder body. The cooling water channels are communicated with each other in an end-to-tail mode. At least one water inlet and one water outlet are formed. A forming technology is changed into the mode that forging, pressing and machining are combined, so that body materials are compact, grain refining is achieved, mechanical property is good, heat conductivity is high, composite holes are used as the cooling water channels, the cooling performance of the cooling water channels is further improved, the improvements are combined so that the thickness of the launder body can be greatly reduced, a producer can know that the launder with good performance can be obtained with low cost increased, frequent maintaining or replacing is of no need, influence on normal production can be greatly reduced, and production efficiency is greatly improved.

The invention provides a cutting pick and a preparation method thereof and belongs to the field of part manufacturing. According to the cutting pick, a to-be-welded workpiece is heated and welded by comprehensively utilizing a skin effect, a proximity effect and annular effect in welding by means of medium frequency induction heating, so that the mechanical property of a weld joint is substantially equal to that of a cutting pick body. In the welding process, the preparation method has the characteristics of being capable of controlling the upsetting temperature precisely and eliminating interference of human factors to the welding quality to the maximum extent and being high in stability. Meanwhile, casting flaws and flash welding grey-spots are avoided during welding, so that the heatingefficiency is high. Medium frequency induction heating quenching has the advantages of being high in temperature control precision, uniform in hardened layer, relatively high in hardness, high in heating speed, high in production efficiency, little in oxidization and decarburization, pollution-free, low in energy consumption, low in cost and the like.

The invention provides a casting method of a 12-cubic-meter slag ladle. The method comprises the following steps that (1) process design is performed, specifically, a casting scheme that a slag ladle opening faces downwards is adopted, a pouring system is a three-layer ceramic tube pouring gate, a main riser is arranged at the right bottom of the slag ladle, a branch riser is arranged on each of six ground feet, and pouring is simulated to determine each process parameter; (2) alkali phenolic resin sand is adopted for molding, a sand mold adopts split molding, and a sand box is a random tower type box; (3) an imbedding technology is adopted, and anti-falling and anti-rotating wrapping lugs are designed; (4) a bottom box is emptied, and an induced draft fan is adopted for exhausting during pouring; (5) molten steel is smelted in two furnaces, and ladles are closed for pouring; and (6) cooling and post-processing are performed. According to the 12-cubic-meter slag ladle cast through the method, the hardness requirement of equipment tools is lowered, meanwhile, internal defects of products can be reduced, the product quality can be improved, the use requirement can be met, the rate of finished products is up to 99%, the use amount of resin sand is greatly reduced, the production cost is saved, and economic benefits are remarkable.

The invention discloses a process design method of an upper casting for a large ship, which is formed by optimizing on the basis of an existing process. The process design method comprises the following steps that (1), the linear shrinkage is selected as 1.8%-2.0%; (2), cutter leveling is additionally carried out a rib plate of a welding steel plate making contact with a ship body; (3), a processcorrection amount is added to the rib plate; (4), an air exhaust steel pipe is horizontally placed in the middle of a loam core, straw ropes are wound outside peripheral cutting holes, and a wood realsample is subjected to pattern draft according to a ratio of 1:20; (5), a riser is designed by adopting a hot pitch circle method, and spot casting is carried out at the riser; (6), upper and lower middle surfaces are selected as parting surfaces; (7), sand-hanging external chill is horizontally placed on the back surface of the riser; and (8), proper wrapping holes and quantity are selected according to gross weight and maximum height of the casting. By the adoption of the process design method, the casting quality of the upper casting can be guaranteed, the using requirement of a shipyard is met, meanwhile, the production efficiency is improved, the production cost is reduced, and the process design method is suitable for lower castings, upper and lower rudder knobs, rudder stock bearings and dumb braces.

A disk type casting molding device comprises an inner gate communicating with a casting cavity of a disk type casting; and an air outlet riser runner communicating with the interior of the casting cavity is formed in the top of the casting cavity. The air outlet riser runner is of a vertically-through circular truncated cone structure, and the top of the circular truncated cone structure is largerthan the bottom of the circular truncated cone structure. One end of the inner gate communicates with the casting cavity, and the other end of the inner gate communicates with a scum riser. The scumriser is of a hollow arch-shaped flat-bottom structure. A scum feeder head communicates with the top of the scum riser. A filter net is arranged between the scum riser and the scum feeder head. The filter net is a ceramic filter net of a cylinder structure. By combining other structures, the defects that in the prior art, the process yield of castings produced by disk type casting molding is about50%, the top planes of casting cavities easily have the surface casting defects of sand holes, scum holes and gas holes, and the production efficiency and quality cannot meet the requirements easilyare effectively overcome.

The invention provides a vacuum vertical continuous casting machine for high-temperature metal and alloy. The continuous casting machine comprises a vacuum device, a smelting device, a heat preservation device, a crystallization forming device and a traction device. The vacuum device comprises a furnace body and an upper cover body, wherein an exhaust valve and an air inlet valve are arranged on the furnace body; the smelting device comprises a crucible, wherein the crucible is arranged in the furnace body, a heating coil is arranged on the periphery of the crucible, a stirring motor is arranged on the upper cover body, an output shaft of the stirring motor is connected with a stirring rod, and the lower end part of the stirring rod is connected with a stirrer; a discharge hole is formed in the lower part of the crucible; the crystallization forming device comprises a crystallizer, coolers and a heater, the crystallizer is arranged in the peripheral direction of a discharging port in the lower portion of the crucible, and the coolers are arranged on the periphery of the crystallizer; a heater is arranged at the periphery of the cooler; the traction device comprises traction wheels which are arranged in pairs.

The invention discloses an electromagnetic low-pressure casting device and method for a lead-acid battery grid. The electromagnetic low-pressure casting device comprises a grid casting mold and a heat preservation furnace arranged at the bottom of the grid casting mold, a mold cavity of the grid casting mold communicates with the heat preservation furnace through a liquid rising pipe, the bottom of the liquid rising pipe is located below the liquid level of molten lead in the heat preservation furnace, a pressurizing system is used for pressing the molten lead in the heat preservation furnace into the mold cavity through the liquid rising pipe, and a magnetic field generating device is used for applying an electromagnetic field to the molten lead in the mold cavity. According to the electromagnetic low-pressure casting device and method for the lead-acid battery grid, the electromagnetic field is applied in the low-pressure casting process of the grid, and the corrosion resistance of the grid is further improved through the grain refinement effect and the segregation reduction effect of the electromagnetic field.

The invention discloses a precision casting technology for a small type fermentation tank, which comprises the following steps: processing a fermentation tank model for setting, then arranging a pouring gate and a dead head in the model; manufacturing an external model sand box, a positioning loam core and a pouring gate loam core according to casting specifications; manufacturing water-glass sand through mixing, and then placing the water-glass sand in a die for modelling; performing die matching on the water-glass sand, performing roasting and mould assembling by using a hot blast stove, and performing box pressing on the water-glass sand die after the completion of roasting; pouring molten iron in the cavity of the water-glass sand die for pouring, taking out a fermentation tank casting after cooling, performing sand cleaning processing, and then polishing the inner surface and outer surface of the fermentation tank casting; feeding the fermentation tank casting in thermal spraying equipment, uniformly spraying titanium alloy on the inner wall of the fermentation tank casting through a spray gun, and sequentially performing quenching treatment and drying treatment. The precision casting technology has the advantages that the technology is simple, and the cast finished fermentation tank is good in quality, abrasive resistance and corrosion resistance.

The invention relates to the technical field of spheroidal graphite casing and discloses a coating for improving spheroidal graphite casting mechanical performance. A compound generated by chemical reaction during high-temperature metal liquid pouring does not react with the surface of the coating, the compound has certain mechanical strength to be firmly adhered on a spheroidal graphite cast section material and forms a continuous and uniform coating, and used fireproof powder has extremely high fireproofness and can remarkably increase content of pearlite on the surface of a metal casting without causing casting defects like shrinkage cavities, shrinkage porosity, degraded spheroidization, graphite floating and graphite deformation. Components of the coating are mixed quite well, so thataggregate can be well dissolved and uniformly dispersed in a medium, high-temperature crack resistance of the coating reaches Grade I, casting defect rate of the casting is lowered to 0.01%, and casting mechanical performance, especially tensile strength and elongation rate, is greatly improved when compared with existing production processes.