117results about How to "Good spherical effect" patented technology

The invention belongs to the field of casting technologies and new materials and particularly relates to a high-strength high-tenacity cast-state QT700-10 and a production method thereof. Compared with ductile iron produced in the prior art, the high-strength high-tenacity cast-state QT700-10 has high strength and a high elongation rate, heat treatment is not needed, heavy metal, such as, Ni and Mo are not added in production, the tensile strength Rm in the cast state is larger than or equal to 700 MPa, the elongation rate A is larger than or equal to 10%, compared with the standard brand QT 450-10, the lowest tensile strength is improved by 55% under the same elongation rate; and compared with the standard brand QT 700-2, the lowest elongation rate is improved by four times under the same tensile strength. The high-strength high-tenacity cast-state QT700-10 can meet requirements of automobile ductile iron castings with high requirements for safety and comprehensive mechanical properties.

The invention relates to silicon solid melt reinforced ferrite nodular cast iron and a preparation technique thereof. The silicon solid melt reinforced ferrite nodular cast iron is composed of, by weight, 3.05-3.30% of C, 3.80-4.00% of Si, 0.15-0.25% of Mn, 0.035-0.050% of Mg, 0-0.035% of P, 0-0.015% of S, 0.0030-0.0040% of Ce, 0.0045-0.0055% of Sb and the balance iron. In the preparation process, high-quality pig iron and scrap steel are selected, molten iron is melted through an electric furnace, the content of carbon, the content of silicon and the content of manganese are controlled, a certain quantity of pretreating agents, nodulizing agents A, nodulizing agents B and inoculants are added into spheroidizing tundishes for molten iron treatment, a certain amount of antimony is added at the same time so as to adjust the content of cerium, and the spheroidizing effect is good; and inoculant blocks are embedded in a sprue basin, stream inoculation devices are arranged near the sprue basin for stream inoculation, and slagging-off and casting are conducted. The preparation method is simple, the tensile strength, the yield strength and the ductility of the silicon solid melt reinforced ferrite nodular cast iron obtained through preparation reach and exceed the required values, and the impact value at the temperature of -20 DEG C under the condition that no V-shaped notch exists also meets the requirements, so that the metallographical effect is good.

The invention discloses a high-silicon-molybdenum ductile iron material and a preparation method thereof. The high-silicon-molybdenum ductile iron material comprises the following components in percentage by weight: 2.90 to 3.35 percent of C, 4.40 to 4.80 percent of Si, 0.50 to 0.75 percent of Mo, 0.30 to 0.50 percentage of Cr, 0.20 to 0.45 percent of V, 0.10 to 0.30 percent of Mn, 0.04 to 0.07 percent of Mg, less than or equal to 0.07 percent of P, less than or equal to 0.02 percent of S, and the balance of Fe. For the high-silicon-molybdenum ductile iron material, the tensile strength is more than or equal to 710 MPa, the yield strength is more than or equal to 500 MPa, the extensibility is more than or equal to 10 percent, and the hardness is 230 to 265 HBW5/750. The high-silicon-molybdenum ductile iron material also contains a trace amount of Sn and Sb. The high-silicon-molybdenum ductile iron material eliminates fragmental graphite and graphite deterioration layers, ensures the spheroidization grades of the parts with different wall thicknesses, and the defects of microscopic shrinkage and the like are overcome.

The invention relates to an alloy ductile iron crankshaft and a heat treatment process thereof. The heat treatment process comprises the following steps: the carbon structural steel or the tool steel is taken as the raw material, carburant and ferrosilicon are added during the smelting process of an electric furnace in sequence, and the alloy ductile iron crankshaft comprises the following components (weight percentage): C accounts for 3.50-4.00, Si accounts for 1.6-2.5, Mn accounts for 0.3-0.9, P is less than 0.040, S is less than 0.03, Cr accounts for 0.03-0.07, Cu accounts for 0.2-0.5, Mg is less than 0.08, Ti is less than 0.02 and the balance is Fe. The austenization processing temperature is 840-920 DEG C, the heat preservation is carried out for 0.5-2.5 h, the three-phase region processing is performed at the temperature of 770-850 DEG C along with furnace cooling, and the time for the three-phase region processing is 1-3 h. The invention improves the nodularizing effect and the inoculation quality of the crankshaft, has low Ti content and effectively inhibits the influence of the heredity of the molten iron to the quality of the casting part; the heat treatment is added in the three-phase region processing; and the tensile strength of the alloy ductile iron crankshaft is equal to or more than 900 MPa, the yield strength is equal to or more than 500 MPa, the elongation rate is larger than or equal to 5 percent, and the alloy ductile iron crankshaft has excellent comprehensive properties and can be manufactured into high-trademark QT900-5 crankshaft.

The invention provides a preparation method of as-cast mixed matrix QT600-10 ductile iron. The preparation method comprises the following steps of S1, adding of raw materials: adding 40 to 60 percentby mass of pig iron, 25 to 40 percent by mass of scrap steel, 10 to 20 percent by mass of foundry returns and 0.1 to 0.3 percent by mass of electrolytic copper anode; S2, molten iron smelting: addingthe electrolytic copper anode after the scrap steel, pig iron and foundry returns are all smelted; S3, in-ladle melt treatment: placing a rare earth-containing nodulizing agent into one side of a bottommost part of a nodulizing ladle, placing a silicon-barium-calcium inoculant into an upper part of metal particles of the rare earth-containing nodulizing agent, and discharging molten iron into thenodulizing ladle for nodulizing and in-ladle inoculation, wherein the nodulizing treatment temperature is 1,500 to 1,550 DEG C; and S4, pouring: transferring the molten iron in the nodulizing ladle into a pouring site for pouring at a temperature of 1,380 to 1,420 DEG C, and adding a strontium-silicon following inoculant along with the molten iron during pouring. According to the preparation method, the content ranges of pearlite and ferrite in a matrix structure are regulated and controlled through the selection and control of raw materials as well as the alloy component design, so as to obtain a ductile iron material suitable for elevator parts.

The invention discloses a medium silicon molybdenum niobium spheroidal graphite cast iron material and a preparation method thereof. The medium silicon molybdenum niobium spheroidal graphite cast iron material is prepared from the following chemical components in percentage by mass: 2.8-3.2% of C, 4.2-4.5% of Si, less than or equal to 0.4% of Mn, less than or equal to 0.04% of P, less than or equal to 0.015% of S, 0.8-0.9% of Mo, 0.6-0.9% of Ni, 0.4-0.7% of Nb, 0.03-0.06% of Mg, 0.15-0.25% of V and the balance of Fe and inevitable other elements. Since C04 high-purity pig iron and waste steel are taken as raw materials, a medium-frequency induction furnace is adopted for smelting, and a carburant, silicon carbide, ferrocolumbium, nickel plates, ferrosilicon and ferrovanadium are added in different time phases of smelting, raw iron chemical components and smelting temperature expected by design can be achieved, and the product disclosed by the invention can be prepared through nodulization and two times of inoculation. By adopting the edium silicon molybdenum niobium spheroidal graphite cast iron material disclosed by the invention, an exhaust manifold of an engine can work under a working condition of about 800 DEG C, the high-temperature use property of the exhaust manifold can be improved, and the service life of the exhaust manifold can be prolonged.

The invention provides a casting technology of a low-temperature and high-tenacity spheroidal graphite cast iron butterfly valve containing carbides and belongs to the technical field of casting technologies. The spheroidal graphite cast iron butterfly valve with high impact tenacity, high wear resistance and long impact fatigue life is obtained through smelting, spheroidization, pouring, box pulling and heat treatment.

The atomizing formation apparatus for producing spherical casting WC powder includes low pressure inert gas intake assembly; furnace shaft containing the feeding mechanism, heater and graphite furnace tube; jetting and atomizing formation assembly containing beam current tube, inner and outer nozzles, high pressure inert gas supplying mechanism and atomizing formation barrel; and water cooling circulation mechanism. Owing to that the melt of the material in the protection of inert gas is acted by the high pressure inert gas flow to be jetted, atomized and formed into spherical powder, the produced spherical casting WC powder has compact structure and low cost. The technological process of the present invention is short, high in production efficiency, stable in product quality, low in power consumption and production cost and good in product using effect.

The invention provides a method for preparing B4C/Y112 aluminum base composite material semi-solid slurry. The method comprises the following steps of: first, putting a matrix material Y112 aluminum alloy ingot into a melting furnace and heating the aluminum alloy ingot to reach the temperature of 630-640 DEG C; refining the aluminum alloy ingot at the temperature; after standing for 20-30 min, cooling the aluminum alloy ingot to reach 595-605 DEG C; pouring liquid aluminum alloy into mechanical stirring equipment by using a pouring pipe; stirring the liquid aluminum alloy for 5-8 min at a speed of 400-600 r/min to reach a set stirring temperature of 565-585 DEG C; adding B4C reinforcing particles; and stirring for 5-8 min at a constant temperature of 565-585 DEG C so as to obtain the B4C/Y112 aluminum base composite material semi-solid slurry. The method for preparing the B4C/Y112 aluminum base composite material semi-solid slurry, provided by the invention, has the advantages of fine and uniform B4C/Y112 semi-solid structures, good nodulizing effect, simple process, safety, reliability, convenience for operation and no pollution of three wastes; and the semi-solid forming requirement is completely satisfied.

The invention discloses a spheroidizing agent for spheroidal graphite cast iron, belonging to the field of cast iron metallurgical technology, and aiming at overcoming the defects that the spheroidizing effect of the spheroidizing agent in the prior art is poor, and the mechanical properties of the obtained spheroidal graphite cast iron can not meet the requirements. The spheroidizing agent for the spheroidal graphite cast iron comprises the components by mass percent: 2-7% of Y, 7-9% of Mg, 37-44% of Si, 2-3% of Ca, 0.3-0.4% of Sb, 0.1-0.4% of Mn, 0.2-0.5% of Al, 0.2-0.5% of Ti, and the balance of Fe and unavoidable trace elements. The invention also discloses a preparation method of the spheroidizing agent for the spheroidal graphite cast iron. The spheroidizing agent is good in spheroidizing effect, and the spheroidal graphite cast iron obtained by spheroidizing has high toughness, ferrite quantity and spheroidization rate so as to be especially suitable for castings of various machine moulds with high strength and impact power.

The invention discloses a kind of spheric casting tungsten-carbide powder with atomization forming method, it includes batch, smelting, atomization forming, sifting. Because that it melts the materials under the protection of inert gas in sealed condition and atomization forms into spheric powder by high pressure, strong inert gas, the craft flow is short. The operation is convenient, the product has a very good quality and high rigidity, the cost is decreased.

The invention relates to a method for spheroidizing heat treatment of eutectic silicon in eutectic aluminium-silicon alloy. The method refers to carrying out spheroidizing annealing at the eutectic temperature (577 DEG C) of aluminium-silicon alloy. According to the method, annealing is carried out on the alloy at the eutectic temperature (577 DEG C) of aluminium-silicon alloy to enable needlelike eutectic silicon to have rapid balling; and the method is a simple and effective method for spheroidizing heat treatment of eutectic silicon to improve the mechanical property of eutectic aluminium-silicon alloy.

The invention discloses pipe die powder for centrifugally casting a nodular cast iron pipe and a preparation process thereof. The pipe die powder comprises the following components in percent by mass: 60-65 percent of Si, 1.5-2.0 percent of Ca, 2.0-3.0 percent of Ba, 1.4-1.6 percent of Mn, 1.0-1.5 percent of Mg, 1.0-2.0 percent of Zr, 0.7-1.5 percent of Al and the balance of Fe; and the granularities of pipe die powder comprise less than 1.5 percent of 80 mu, 25-30 percent of 100-120 mu, 40-50 percent of 140-180 mu, 25-30 percent of 200-300 mu and less than 2.5 percent of more than 300 mu. The preparation process comprises the following steps of: preparing, melting, pouring, cooling, crushing, milling, proportioning granularities and packaging in vacuum. The pipe die powder has the advantages of uniform components, consistent melting points and reasonable granulometric class, and is beneficial to the prolonging of the service life of a pipe die of the nodular cast iron pipe, the reduction of a series of casting defects of cockles, poor nodulizing, surface cracks and the like of the nodular cast iron pipe, the improvement of the quality of the nodular cast iron pipe and the yield, and the lowering of the production cost.

The invention discloses a spheroidizing annealing technology of a high-tenacity fastener wire rod. The spheroidizing annealing technology comprises the following steps: placing a fastener wire rod into a thermal treatment furnace, introducing a protective gas into the thermal treatment furnace, raising the temperature in the furnace to 720-740DEG C, and performing heat preservation for 1-3h; carrying out first-stage cooling: cooling the temperature in the furnace to 680-700DEG C at the speed of 10DEG C/h, and performing heat preservation for 2-4h; carrying out second-stage cooling: further reducing the temperature in the furnace to 630-650DEG C at the speed of 20DEG C/h; and carrying out third-stage cooling: naturally cooling the fastener wire rod to normal temperature. The fastener wire rod treated by adopting the technological method is uniform in metallographic structure, high in tenacity, high in ductility, low in hardness and suitable for subsequent high-difficulty repeated plastic machining forming, and the forming cracking rate of the product is low.

The invention discloses a preparation method of spherical nano strontium carbonate, which comprises the following steps: S101. adding a shape agent into a soluble strontium salt solution, and dissolving by stirring to obtain a first solution, wherein the mole ratio of the shape agent to the strontium ions in the strontium salt solution is 2:(1-1.5); S102. transferring the first solution into the ultrasonic reactor, and introducing CO2 gas in the ultrasonic process until the pH value of the solution is neutral, thereby obtaining a second solution, wherein the flow rate of the introduced CO2 gas is 2-10 L/minute; S103. carrying out solid-liquid separation on the second solution to obtain a solid product; and S104. washing the solid product, and drying to obtain the spherical nano strontium carbonate. The invention also discloses the spherical nano strontium carbonate prepared by the preparation method.

The invention discloses a composite particle reinforced roller of a hot-rolling seamless steel pipe sizing mill or reducing mill and a preparation method thereof. Composite particles are composed of hardening particles, active wetting agents and matrix reinforcing agents. The composite particle reinforced roller of the sizing mill or reducing mill is cast after nodular cast iron matrix molten metal is reinforced; and the high-strength and high-toughness composite particle reinforced roller is obtained by conducting isothermal quenching and machining on the roller. The composite particle reinforced roller is resistant to abrasion and impact; the service life of the roller is prolonged by over two times; the production cost is lowered; the production efficiency of a steel pipe production enterprise is improved, and economic benefits of the steel pipe production enterprise are increased.

The invention discloses a manufacturing process of high-temperature nodular cast iron. The manufacturing process comprises the steps of (A) mixing materials including scrap steel, pig iron, foundry returns, ferromanganese, silicon carbide, a carburant, ferrosilicon and ferromolybdenum; (B) conducing smelting, specifically, charging the mixed materials into a furnace to be melted into molten iron;(C) conducting heating and standing, heating the molten iron to 1520-1550 DEG C, stopping heating and conducting standing to reach 1460-1480 DEG C; (D) conducting filling, specifically, preheating a casting ladle, filling a nodulizing agent into the pit side of the bottom of the casting ladle, tamping the nodulizing agent with a hammer, covering the nodulizing agent with a layer of nodulizing insulation covering agent, conducting tamping with the hammer, and covering the nodulizing insulation covering agent with a nucleating agent; (E) conducting nodulizing and inoculation, specifically, filling the molten iron into the casting ladle, preventing the molten iron from making contact with the nodulizing agent, adding the nucleating agent again when the molten iron yield is one half of the total treatment amount, stirring the molten iron and then conducting standing for 1.5-3.0 min; (F) conducting casting; and (G) conducting cooling and unpacking. Through the manufacturing process, the microstructure of a casting can be improved to obtain the good graphite from and reduce the pearlite content, the high-temperature strength can be substantially improved, the use requirements are met, and the service life of products is prolonged.

The invention relates to the field of as-cast high-strength high-elongation synthetic nodular cast iron. The invention relates to as-cast high-strength high-elongation synthetic nodular cast iron anda preparation method thereof. The nodular cast iron is characterized in that under the as-cast condition, the nodular cast iron meets performance requirements that the tensile strength Rm is larger than or equal to 700 MPa, and the percentage elongation A after fracture is larger than or equal to 10%; the matrix is a pearlite-ferrite mixed matrix; the content of pearlite is 55%-75%, a spheroidizing grade is 1-2, a graphite size grade is 6-7, the nodular cast iron is composed of elements, by mass, 3.5%-3.7% of C, 2.9-3.3% of Si, less than or equal to 0.2% of Mn, less than or equal to 0.035% ofP, less than or equal to 0.02% of S, 0.5%-0.7% of Cu, 0.55%-0.75% of Ni, 0.030%-0.065% of Mg and the balance of Fe and trace elements. The method has the beneficial effects that scrap steel and raw material pure iron are adopted for recarburization, base iron is smelted in a medium-frequency induction furnace, then pretreatment, spheroidizing treatment and inoculation treatment are conducted, final pouring is conducted, and QT700-10 is achieved under the as-cast condition.

The invention relates to the technical field of surgery department medical instruments, and discloses a combined acetabulum file. The combined acetabulum file comprises a hemisphere tool rest and detachable blades, the axis of a hemisphere is adopted as the rotating axis of the acetabulum file, 2-5 pairs of cutting blades are mounted on the hemisphere face of the hemisphere, each pair of cutting blades are symmetrically arranged relative to the rotating axis, each cutting edge is divided into 3-6 sections by small gaps on the cutting edge, and the adjacent blades are spirally distributed along the hemisphere face. The cutting edges of the acetabulum file are not likely to be abraded and can be repeatedly used, after the blades are abraded, the blades can be replaced, and the cutting effect is good.

The invention discloses a spheroidizing annealing process for high-toughness medium carbon steel wires. The spheroidizing annealing process comprises the steps as follows: putting the steel wires into a heat treatment furnace, charging protective gases into the heat treatment furnace, raising the temperature in the furnace to 710-730 DEG C, and keeping the temperature for 3-5 hours; performing first-stage cooling: cooling the temperature in the furnace to 680-700 DEG C at a speed of 10 DEG C/hour, and keeping the temperature for 2-4 hours; performing second-stage cooling: continuously cooling the temperature in the furnace to 630-650 DEG C at the speed of 10 DEG C/hour; and performing third-stage cooling: naturally cooling the medium carbon steel wires to a normal temperature. The medium carbon steel wires, which are processed by the process provided by the invention, are uniform in metallographic structure, high in toughness, high in malleability, and low in hardness; and the medium carbon steel wires are suitable for subsequent difficult multi-step stamping and forming, and are low in flattening, bending, and cracking rate.

The invention provides a processing and preparation process for a floating oil seal. The processing and preparation process for the floating oil seal comprises the following steps of precoated sand modeling through a rubber mold, casting, shot blasting, blank check, grinding, quenching heat treatment, oil grinding, cleaning, oil injection, installation of a rubber ring, check, packaging, storage and the like. The processing and preparation process for the floating oil seal has the beneficial effects that the formula and the process are simple, and industrialization is achieved easily; the performance of castings obtained from the as-cast mode is greatly improved; by adding low-phosphorus steel scraps in the castings, the performance of the castings is effectively improved and the production cost of the castings is reduced; by adding ferromanganese in the castings, sufficient toughness is achieved, the pearlite content can be increased, and high strength and hardness are obtained; by adding silicon carbide in the castings, the abrasion resistance of the castings can be improved and the service life is doubled or tripled; by adding a proper quantity of copper scraps and tin scraps inthe castings, generation of pearlite can be effectively promoted, and texture crystal grains are refined; and a grinding machine grinds both the upper surface and the lower surface so that the flatness and smoothness of the outer surface of the floating oil seal can be ensured.