117results about How to "Reduce slag inclusion" patented technology

The invention discloses a method for producing a voltage-bearing aluminum alloy tank body of an ultra-high voltage switch by a V-process, comprising the following steps: model making, thin film heating, thin film shaping (film absorbing), coating spraying, sandbox placing, ram-jolting by adding sand , back film covering, film loosening, core setting, box folding, pouring, removing box and shaking out. After the process is improved, an intermediate frequency furnace is utilized to melt and a crucible heat preserving furnace is utilized to modify and refine. When melting in the intermediate frequency furnace, microelements such as tombarthite and the like are replenished and a new non-stirring melting and refining technology is adopted so as to reduce oxide inclusion content in alloy liquid. Modification and refining treatment in the crucible heat preserving furnace ensures high purity degree and high component precision of aluminum liquid, and using pure aluminum alloy liquid can increase the ratio of acquiring qualified pressure-proof tank body foundry products.

The invention discloses an alloy ingot for an automotive hub and a production method thereof. The alloy ingot comprises the following components: 6.8-7.2% of Si, 0.28-033% of Mg, 0.10-0.15% of Ti, 0.015-0.030% of Sr, less than or equal to 0.10% of Fe, less than or equal to 0.05% of Mn, less than 0.01% of zinc, less than 0.01% of Cu, less than 0.003% of Ca, less than 0.002% of P, less than 0.02% of other single impurity content, less than 0.1% of total impurity content and the balance of aluminum. The production method of the alloy ingot for the automotive hub comprises the following steps of: adding 3303 industrial metallic silicon and electrolytic aluminum liquid for batching, heating at an appropriate temperature and melting, spreading a covering agent so as to reduce oxidation slagging, stirring so that the industrial metallic silicon rapidly melts, keeping uniform temperature, slagging off, keeping melt clean, spraying powder and refining by adopting high-purity N2 and a refined powder spraying agent, controlling the temperature of a smelting furnace to 740-750 DEG C, adding Al-Sr alloy to aluminium water, carrying out secondary degassing and slagging-off by adopting a powder spraying refinement method, filtering to remove slag, and casting the alloy ingot in line with requirements. The alloy ingot obtained by the method has the advantages of stable and uniform components, compact structure and clean surface; and the production method is the best production method for producing the A356.2 alloy ingot for the low-iron high-end automotive hub.

The invention discloses a method for manufacturing a bimetallic metallurgical composite wear-resisting tube blank, which comprises the following steps: firstly, spraying a water-based zircon powder coating onto a metal tube die after being baked to between 200 and 300 DEG C, wherein the spraying thickness is 1.0 to 3.0mm; secondly, centrifugally casting external liquid metal on the metal tube die after being baked to between 200 and 350 DEG C, cooling the metal tube die after casting, beginning to cast internal liquid metal into the metal tube die when an internal surface temperature of the outer layer is cooled to a temperature lower than a solidus temperature of the external metal; and finally, pouring the internal liquid metal into the metal tube die for centrifugal casting, cooling the metal tube die after casting, and stopping cooling when the outer layer and the inner layer are completely solidified, then the outer layer and the inner layer are metallurgically fused completely, wherein the outer layer is made of a plain carbon steel material or a low-alloy high-strength steel material and the inner layer is made of a high-chromium white cast iron material. The invention also discloses the bimetallic metallurgical composite wear-resisting tube blank manufactured by the method. The outer-layer metal and the inner-layer metal of the tube blank manufactured by the method can be metallurgically fused completely; the qualification rate is improved; and the use safety is high.

The invention relates to a sand mold casting technology comprising steps that: modeling sand is manufactured, wherein casting sand with a size of 40-70 meshes are added to 1-3% of water glass; the mixture is uniformly mixed in a fracturing blender; molding and core-making are carried out; a manufactured mould cavity is vibrated on a vibration platform; casting is carried out during vibration; when a metal solution starts to solidify, the vibration step is stopped. The equipment suitable for the sand mold casting technology comprises a lower platform rack which is used for supporting an upper platform rack used for bearing the mould cavity, wherein the supporting is realized by using a rubber spring. A high-frequency motor used for generating vibration is arranged on the upper platform rack. The equipment and the technology are advantaged in that: the technology and the equipment are environment-friendly; reproducibility for used sand recycling is good; and collapsibility of used sand is good.

The invention relates to a stainless steel water meter shell which is cast by using a lost foam process. The fireproof paint of the lost foam comprises 15 parts of zirconite powder, 15 parts of ferrochromium powder, 12 parts of pyrophillite powder, 10 parts of bauxite, 5 parts of magnesium powder, 5 parts of limestone powder, 4 parts of brown emery powder, 1 part of white emery powder, 2.5 parts of lithium-base bentonite, 2 parts of carboxymethyl cellulose, 1 part of palygorskite, 2 parts of sodium silicate, 2 parts of aluminum sulfate, 1.5 parts of VAE (Vinyl Acetateethylene Emulsion), 0.6 part of n-butyl alcohol, 0.2 part of n-caprylic alcohol and 25 parts of water; an energy converter intubation tube with internal and external threads is arranged inside an inclined tube of the water meter shell; and after being inserted, an energy converter is not directly contacted with a water fluid, so that the service life of the energy converter is prolonged and the stainless steel water meter shell has a wide application prospect.

The invention relates to a capping method for reducing the finishing quantity of slab continuous casting tailing billet and increasing the temperature of the billet tail. The method comprises the following steps that (1) according to the normal final pouring deceleration curve, the final pouring steel flow closing and tailing billet turning mode are conducted, meanwhile, the drawing speed of a continuous casting machine is set at the crawling drawing speed, the crawling speed distance is tracked, and the running interval length of the crawling speed is 2/3 of the length of a crystallizer; (2)after the running length of the crawling speed of the tailing billet exceeds 2/3 of the length of the crystallizer, the drawing speed of the casting machine is controlled at 0.3-0.5 m/min for low drawing speed running, the running length is tracked, after the running length of the billet tail is greater than the length of the crystallizer, the foot roller water volume of the crystallizer is openedaccording to 80% of the maximum water volume, the purpose is for force cooling of the head of the billet tail, and the fact that the a rising accident does not occur during capping is ensured; (3) the tailing billet at the arc and fan section of the casting machine is cooled; and (4) the tailing billet enters the horizontal section and then is subjected to cooling control. By means of the technical scheme, the hole shrinkage and the slag amount of the tailing billet can be minimized in the case that the tailing billet capping does not rise is ensured, and the finishing quantity of the continuous casting tailing billet is reduced accordingly.

A method for vibration-assisted induction brazing includes the following steps that firstly, brazing flux is coated at a lap joint position of a clean work piece to be welded, and a brazing filler metal is preset at the lap joint position of the clean work piece to be welded; secondly, the work piece to be welded penetrates through an induction coil which is connected with a high-frequency power supply and located in the middle of a vibration table of a vibration-assisted high-frequency induction brazing machine, the work price to be welded is matched with a gasket with corresponding thickness to be horizontally placed on the vibration table, the lap joint position of the work piece to be welded is located at the center of the induction coil, and the work piece is horizontally fixed on the vibration table through fasteners at two ends of the vibration table; thirdly, the power supply of the high-frequency induction brazing machine and a water-cooling system are started, and the work piece to be welded is heated for 5-40s; fourthly, when the brazing filler metal is melted and spread, a mechanical vibration gauge is started to drive the vibration table to vibrate for 2-10s; fifthly, vibration is stopped, and heat preservation is performed for 5-30s to enable the brazing filler metal flows and spreads into gaps; and sixthly, the power supply of the high-frequency induction brazing machine is shut down, and the work piece is taken out when the work piece is cooled. The method for the vibration-assisted induction brazing is capable of obviously reducing defects that air holes, slag inclusion and poor gap filling exist in brazing seams and improving compactness of the brazing seams and mechanical performances of the joint.

The invention relates to a processing technology for refining weld joint structures in a welding process, in particular to a method and a device for refining weld joint structures by using pulsed magnet fields in the welding process, and belongs to the technical field of welding. The method for refining weld joint structures by using pulsed magnet fields in the welding process includes that welding is performed by using an ordinary gas metal arc welding method, an applied magnetic field is added above a gas metal arc welding pool, mechanical movement and welding gun movement of the magnet fields are synchronous, electric arc and melt drip transition action is controlled by the magnet fields in a welding process, metal melt in the gas metal arc welding pool is forced to move, an electromagnetic stirring effect is produced, and weld joint structures are finally refined in the welding process. According to the method and the device, in the welding process, the weld joint structures are refined, welding defects are reduced, and further the cost is reduced, and the welding quality and the production efficiency are improved.

The invention discloses a chill-free processing method of a wind-driven generator hub, and the method comprises the following steps: manufacture of a mould, manufacture of a sand mould and moulding by casting, wherein in the manufacture of the sand mould, a completely opened bottom gating system is utilized; an ingate is designed to be disc-shaped; a downgate on an upper sprue is a quantitative ladle stopper sprue gate; the ratio of the components is F(straight):F(transverse):F(internal)=1:(1.5-2):(25-28); a rectangular vent hole is arranged at the highest point at the top face of a casting; the total section area of the rectangular vent hole is greater than that of the ingate; a casting head is arranged on the top face of the casting; the height of the single casting head is greater than 400 mm; no chills are discharged during the manufacture procedure; in the moulding by casting, the casting speed of melted iron entering into a casting cavity is controlled within 0.5-1.0 m/s; the casting time is controlled within 150-210 seconds; and the casting temperature is between 1300 and 1310 DEG C. The chill-free processing method of the wind-driven generator hub disclosed by the invention has the advantages that the method adapts to the large scale production of low-temperature ductile iron castings for large wind-driven generator with quite high requirements, the process is simple, and the production cost is low.

The invention relates to a copper-zinc-nickel-cobalt-indium alloy and a preparation method thereof. The alloy comprises the following raw materials by weight percent: 43-65% of Cu, 28-45% of Zn, 1-15%of Ni, 0.3-4% of Co, 0.1-2% of In, 0.08-4% of Mn, 0.05-0.3% of Si, 0-2% of Sn, 0-2% of Ag and 0.03-0.07% of Re containing Ce and La in a weight ratio of 2:3. The preparation method comprises the following steps: smelting high melting point metals -- Ni, Co, and Cu to obtain an intermediate alloy A, smelting deoxidizing elements -- Si, Mn and Cu to obtain an intermediate alloy B, smelting oxidablemetals -- Ce, La and Cu in a vacuum furnace to obtain an intermediate alloy C, melting Cu in a medium frequency furnace, adding the intermediate alloy A in the medium frequency furnace to fully fuse,covering the obtained product with a mixture of cullet and cryolite, fully fusing, adding the intermediate alloy B, then adding metal Ag, Zn, Sn and In, adding the intermediate alloy C to perform full deoxidation and fusion, standing for 50min and performing continuous casting to form copper-zinc-nickel-cobalt-indium alloy ingots.

The invention discloses a cable aluminum foil and a production method thereof. The cable aluminum foil comprises components of the following weight percent: 0.79 to 0.83 percent of Si, 0.22 to 0.26 percent of Fe, at most 0.1 percent of Cu, at most 0.2 percent of Mn, at most 0.05 percent of Mg, at most 0.05 percent of Cr, at most 0.1 percent of Zn, at most 0.08 percent of Ti, at most 0.05 percent of single impurity content, at most 0.15 percent of the total content of impurities and Al as the rest, wherein the content summation of the Fe and the Si in weight percent is less than 1.1 percent. The production method comprises the production technical processes: burdening, melting, component analysis, feeding dilution, powder injection refining, N2 refining, on-line refining outside a furnace, casting, casting plate type detection, blank winding, cold rolling, vertical cutting and splitting, finished product annealing, detection, packing, storage and leaving a factory. The cable aluminum foil has good mechanical property, the tensile strength is from 90 to 105MPa, the extension rate is greater than 25 percent, the production requirement has larger development potential, and the enterprise benefit and the social benefit can be obviously increased.

The invention relates to a silicon-and-magnesium-containing aluminum alloy sheet for an air-conditioning radiator. The silicon-and-magnesium-containing aluminum alloy sheet comprises the following chemical elements by mass percent: 0.25-0.35% of Si, 0.48-0.55 of Mg, 0.01-0.02 of Cr, 0. 05-0.15 of Fe, 0.01-0.03 of Ti, 0.01-0.03 of Cu, 0.005-0.02 of La, and the balance being Al. The aluminum alloy sheet provided by the invention has high strength and toughness, is added with lanthanum, the composition undercooling is carried out during gold casting, crystal grains are refined, a secondary crystal spacing is reduced, gas and inclusions in an alloy are reduced, and an inclusion tends to be nodulized, the surface tension of a melt can also be reduced, the mobility is increased, and ingots are favorably cast. According to a production method provided by the invention, the phenomena of layering, peeling, bubbling and cracking of aluminum alloy are reduced, and the yield is improved; a refining agent has a good refining effect, so that the pores and slag inclusion phenomena are obviously reduced.

The invention belongs to the technical field of aluminum alloys, and relates to a preparation process of a high-light high-brightness anode oxidation casting sheet. The preparation process of the high-light high-brightness anode oxidation casting sheet comprises the following steps of smelting and casting an aluminum alloy cast ingot, and degassing and filtering aluminum alloy melt in the smeltingand casting processes; turning and slitting the obtained aluminum alloy cast ingot; carrying out homogenization heat treatment on the obtained aluminum alloy cast ingot; carrying out solid solution quenching on the obtained material; stretching the obtained quenched sheet; and carrying out aging treatment on the obtained material to obtain a required product. The components and the casting process of the produced precision casting sheet are strictly controlled, a specific homogenization heat treatment process, a solid solution quenching process, a stretching process, an aging process and a machining process are adopted, it is guaranteed that the sheet is fine and uniform in structure, free of rolling texture, and extremely low in internal stress, and the strength and the anodic oxidationeffect of the casting sheet are improved.

The invention relates to a die for avoiding shrinkage and slag inclusion of a metal mold aerospace casting. The die comprises a die body, a shell sand core and a pipeline internal sand core, and is characterized in that the shell sand core is made of low-gas-evolution precoated sand, and the pipeline internal sand core is made of high-strength precoated sand. The invention further discloses a method for avoiding shrinkage and slag inclusion of the metal mold aerospace casting. By comprehensive application of various technical methods including replacing common precoated sand by high-strength and low-gas-evolution precoated sand, coating the surfaces of the sand cores with chilled coatings, reasonable metal mold pouring gate design, reasonable layout of closed risers and slag discharge channels and refining treatment of molten aluminum in die smelting prevention, the problems of shrinkage and slag inclusion of the metal mold aerospace casting in the production process can be greatly decreased, and the qualification rate of the casting reaches 80% or more.

The invention discloses a technology for producing a ductile iron flange. The technology comprises the following steps: (1) mould preparing, wherein a special shape molding box is used for molding; (2) smelting, wherein the target chemical components are 3.6-38% of C, 2.5-3.2% of Si, 0.3-0.5% of Mn, 0.05-0.07% of P, less than 0.03% of S and the balance of Fe, and an appropriate amount of rare earth alloy purification iron liquid is added, the molten iron discharge temperature is not less than 1450 DEG C, an inoculator adopts 0.8% FeSi75, a nodularizer adopts rare earth magnesium alloy, spheroidizing is carried out at 1380-1450 DEG C, and the residual amount of rare earth magnesium is controlled between 0.02-0.04%; (3) pouring, wherein the pouring temperature is between 1400-1430 DEG C, and the pouring velocity is connected to be 20 kilograms/second; and (4) thermal treatment, wherein a casting is austenitized in an electric furnace, is then oil-quenched and is tempered. The technology has the beneficial effects the nodularizer is adopted, so that the tissue of the ductile iron flange is small, uniform and dense, the corrosion resistance is improved, and the mechanical strength is also obviously improved; and reasonable pouring dimensions and dead heads are adopted, so that the defects of subsurface porosity, slag inclusion, shrinkage porosity and the like of the product are reduced.

The invention provides an interior purification technology for a molten aluminum smelter. The interior purification technology comprises two times of refining and three times of drossing, wherein before refining, a refining agent is added, in the refining process, powder is sprayed in the smelter to be refined, the refining agent is sprayed into molten aluminum in the smelter by a powder blower, and argon is aerated for degassing. According to the interior purification technology, the cleanliness of electrolytic molten aluminum is improved, the hydrogen content of the processed molten aluminum is lower than 0.125ml/100gAl, the deslagging ratio reaches above 85%, the problems of looseness and slag inclusion caused by aluminum alloy ingot casting are solved, and the product percent of pass is greatly increased.

The invention discloses a novel pressure device for a finely turned bright aluminum alloy wheel. The device consists of a nitrogen making machine, a nitrogen dryer, a gas storage tank, a system control cabinet for a low-pressure casting machine, a pressure relief nitrogen recovery tank, gas conduits and a holding furnace for the low-pressure casting machine. Nitrogen generated by the nitrogen making machine is introduced into the nitrogen dryer through the conduit; the dried and purified nitrogen is introduced into the gas storage tank through the conduit, and the pressure of the nitrogen in the gas storage tank is 500 to 700kpa; the nitrogen in the gas storage tank is introduced into the system control cabinet for the low-pressure casting machine through the conduit, and is introduced into the holding furnace for the low-pressure casting machine through the system control cabinet for the low-pressure casting machine for pressurization; and gas obtained after pressure relief when a casting is finished through die casting flows into the pressure relief nitrogen recovery tank through the conduit, and the gas in the pressure relief nitrogen recovery tank flows into the nitrogen dryer through the gas conduit for drying and recycling. In the invention, the nitrogen is used as a pressurization medium of the low-pressure process, so that the oxidation of molten aluminum is greatly reduced, and needle holes and slag eyes on a final product are reduced; meanwhile, the loss of aluminum, magnesium and strontium is lower, so that mechanical properties of the product are guaranteed.

The invention relates to a rare earth strengthening aluminum alloy sheet for an air conditioner radiator and a preparation method of the rare earth strengthening aluminum alloy sheet. The aluminum alloy sheet comprises the following chemical element compositions in percentage by weight: 0.45-0.75 of Si (silicon), 0.02-0.04 of La (lanthanum), 0.01-0.03 of Ce (cerium), 0.01-0.03 of Pr (praseodymium), 0.01-0.03 of Nd (neodymium), 0.24-0.49 of Ni (nickel), 2.03-2.69 of Mg (magnesium) and the balance of Al (aluminium). The aluminum alloy sheet disclosed by the invention uses magnesium and rare-earth elements, so that the strength of alloy is greatly strengthened, crystal grains are refined, gases and inclusions are reduced, and the aging temperature is low. The production method disclosed by the invention reduces the layering, peeling, bubbling and cracking probabilities of the aluminum alloy, and the rate of finished products is increased. The refining agent of the aluminum alloy sheet has a good refining effect, and the probabilities of air holes and slag inclusion are obviously reduced.

The invention discloses a double-liquid compound casting method for an automobile mold casting. The method specifically comprises the following steps: S1, sand mold manufacturing: 1) drawing: drawinga sand mold pattern matched with a production component according to the pattern and the size of the production component; 2) molding sand proportioning: preparing skin sand and core sand from new sand, old sand, coke particles and clay in proportion; and 3) molding: separately preparing a mold and a sand core from the skin sand and the core sand by means of a molding machine; S2, metal smelting:separately putting a first metal raw material and a second metal raw material in a smelting furnace to be smelted into a molten state; and S3, pouring: injecting a first metal original liquid in the S2 into the mold through a first pouring device, and injecting a second metal original liquid into the mold through a second pouring device at the same time for molding. The method disclosed by the invention is simple to operate and high in practicality, defects such as pores, shrinkage cavities, shrinkage porosities, cold shut and poor surface smoothness can be reduced greatly, and the quality ofthe casting is improved.

The invention relates to a method for enabling a nano molten iron purifying modifier to be used in an austenite ductile cast iron wear-resistant casting. The method for adding the nano molten iron purifying modifier comprises the following steps: adding a certain quantity of nano molten iron purifying agent into a steel ladle to perform enhanced deoxidation and desulphurization after conventional deoxidation of molten iron, performing further degasification at the same time and fully stirring by utilizing the impact strength of the molten iron during tapping, so that the molten iron is greatly purified. The nano molten iron purifying modifier has the effect of refining grains, can improve both the strength and the plasticity of materials and can also obviously improve the mechanical property of the materials at the same time. According to the method, the strength, the hardness and the toughness of the austenite nodular iron wear-resistant casting can be obviously improved.

The invention discloses a cold-type casting welding method of roller necks, comprising: a procedure of adjusting the verticality of a cold-type neutral roller and fixing by an oblique iron, a fill forging process, a baking process, a mould assembling process, a wash melting process and a pouring process, wherein, in the fill forging process, the periphery of the roller neck on the oblique iron is filled and forged by water glass self-hardening sand until the height approaches to the height of the cross section of the roller neck; 1-4 layers of prefabricated fireproofing tiles are tightly arranged on the surrounding of the excircle of the roller neck; the end-face external diameter of the fireproofing tile is larger than the internal diameter of an overflow box; the upper flat surface of the fireproofing tile is lower than the cross section of the roller head; in the baking procedure, the water glass self-hardening sand automatically hardens for over 2 hours, and then the roller head fracture surface is baked and preheated by coal fire for 24 hours; and after the baking process is finished, the mould assembling process, the wash melting process and the pouring process are carried out. By the method provided by the invention, the defect of the air vents of the cast soldering products can be avoided, the casting quality is ensured, and the repair time of the roller is greatly shortened.