32results about How to "Increase the number of balls" patented technology

The invention relates to a nodular cast iron inoculant and a preparation method thereof and an application in smelting nodular cast iron. The nodular cast iron inoculant consists of 3-6% of Bi, 40-50% of Si, 0.5-3% of Ba, 0.1-3% of La, 10-18% of Ca, 1-3% of O, 0.5-3% of S and the balance of Fe and unavoidable trace elements. The nodular cast iron inoculant is prepared by the steps of mechanically mixing a metal oxide, a metal sulfide and a silicon iron-based alloy; adding an adhesive into a grinding device, and pressing the mixture into a cluster; breaking the cluster, screening and wrapping with an aluminum foil. In use, when the output molten iron accounts for about 1/2 of the lip-pour ladle, the inoculant is added to perform inoculation treatment on the nodular cast iron once or multiple times. The inoculant provided by the invention contains the trace elements such as O, S, Bi and the like and is low-silicon and efficient, and multiple heterogeneous nucleation mass points are formed in the iron liquid, thereby increasing the graphite quantity, improving the shock resistance, mechanical property and yield, increasing the utilization rate of foundry returns, and increasing the economic benefits.

The invention relates to a preparation method of a low temperature spherical iron casting for a 3 MW wind power wheel hub as well as an additive, a nodulizing agent, an inoculant and an instantaneous inoculant for founding. The low temperature spherical iron comprises the following elements in percentages by weight: 3.6-3.9 percent of C, 1.7-2.5 percent of Si, 0.1-0.3 percent of Mn, less than 0.045 percent of P, less than 0.02 percent of S, 0.03-0.6 percent of Mg and the balance of trace impurity element. The preparation method of the low temperature spherical iron comprises the following steps of: (1) smelting; (2) nodulizing and inoculation, wherein the nodulizing agent consists of an A-type nodulizing agent and a B-type nodulizing agent, the A-type nodulizing agent comprises the following elements in percentages by weight: 5.5-6.5 percent of Mg, 44-48 percent of Si, 2-3 percent of Ba, 1-1.4 percent of Ca and the balance of Fe, and the B-type nodulizing agent comprises the following elements in percentages by weight: 6-7 percent of Mg, 42-45 percent of Si, 1.0-1.5 percent of Re and the balance of Fe, and stream inoculation is carried out in the nodulizing process and the inoculant comprises the following elements in percentages by weight: 72-76 percent of Si, 1.5-2.5 percent of Ca, 8-12 percent of Ba, less than 0.15 percent of Al and the balance of Fe; and (3) pouring: stream instantaneous inoculation is carried out in the pouring process and the instantaneous inoculant comprises the following elements in percentages by weight: 68-75 percent of Si, 0.75-1.25 percent of Ca, 1.5-2.5 percent of Bi, less than 0.15 percent of Al and the balance of Fe.

The invention provides a high-strength sulfur-oxygen nucleating agent. The high-strength sulfur-oxygen nucleating agent comprises the following elements in percentages by mass: 70-76% of Si, 0.2-1.0%of Ca, 0.3-0.5% of Ba, 1.5-2.0% of La, 0.5-1.5% of Al, 0.3-0.9% of S, 0.3-0.9% of O, 0.5-1.5% of Sb and the balance of iron. The sulfur-oxygen nucleating agent is prepared from the following raw materials in parts by weight: 2-4 parts of steel scrap, 130-140 parts of silicon iron, 1-1.4 parts of silicon barium, 1-1.8 parts of calcium silicon, 2-4 parts of pure lanthanum, 1.5-2.5 parts of stibonium, 1-2 parts of FeS and 1-1.4 parts of FeO. By the prepared high-strength sulfur-oxygen nucleating agent, the number of graphite nodules in nodular cast iron can be increased obviously, the strength and toughness of the nodular cast iron can be improved, the chilling tendency of the nodular cast iron is relieved obviously, the nodularity, the number of graphite nodules and the number of ferrites ofthe nodular cast iron are increased, shrinkage in a casting process is eliminated, and complicated castings with excellent quality can be formed.

The invention relates to the field of spheroidal graphite cast iron, in particular to ferritic spheroidal graphite cast iron and a preparation method thereof. The ferritic spheroidal graphite cast iron comprises, by mass, 3.5%-3.8% of carbon, 2.4%-2.7% of silicon, 0.29%-0.35% of manganese, 0.03%-0.04% of cerium, 0.045%-0.06% of magnesium, 0.08%-0.1% of yttrium, 0.01%-0.02% of molybdenum, 0.02%-0.03% of rhenium, not more than 0.04% of phosphorus, not more than 0.018% of sulphur and the balance iron. The preparation method particularly includes the steps of (1), melting raw materials by a medium-frequency induction furnace prior to desulfurization; (2), uniformly mixing silicon carbide powder with rare earth magnesium alloy, then pouring the mixture into a spheroidizing package, covering the spheroidizing package with a first inoculant for spheroidizing and primary inoculation treatment prior to secondary inoculation treatment, and casting so as to obtain a cast; (3), subjecting the cast to heat treatment so as to obtain the ferritic spheroidal graphite cast iron. The ferritic spheroidal graphite cast iron is high in spheroidizing ratio and strength and excellent in toughness and impact plasticity, and the preparation method is simple and efficient.

The invention discloses high-wear-resistance long-life ductile iron, comprising, by weight, 3.80-3.88% of C, 2.20-2.30% of Si, 0.55-0.65% of Mn, </=0.020% of P, </=0.010% of S, 0.45-0.55% of Cu, 0.30-0.40% of Mo, 0.0040-0.0060% of La, 0.035-0.045% of Mg, and the balance of iron and unavoidable impurity. The invention is intended to provide the high-wear-resistance long-life ductile iron that has high rigidity and fatigue strength and has improved tensile strength and plasticity, and a method of producing a lower cylinder with the ductile iron.

The invention relates to heat-resisting spheroidal graphite cast iron and a preparation method thereof. The preparation method comprises the following steps: smelting alloy, wherein the alloy comprises the following ingredients by mass: 2.7-3.5% of C, 4.0-5.0% of Si, 1.5-3.5% of W, 0.02-0.05% of Mg, 0.1-0.5% of V, Re being less than 0.03%, 0.15-0.6% of Mo, 0.05-1.0% of Mn, 0 to 0.03% of P, 0 to 0.02% of S, and the balance of iron and unavoidable impurities, discharging molten iron, inoculating the molten iron, spheroidizing, and casting. The heat-resisting spheroidal graphite cast iron prepared by the preparation method is of excellent high-temperature oxidation resistance, high-temperature anti-cracking property and thermal fatigue performance, and is good in mechanical property, low in production cost, and suitable for producing parts of an engine emission system.

The invention discloses a copper-antimony alloy spheroidal graphite cast iron material for crank shafts and a preparation method thereof. The copper-antimony alloy spheroidal graphite cast iron material for the crank shafts comprises the following chemical components:3.60-3.90 of C, 2.00-2.80 of Si, 0.30-0.50 of Mn, no more than 0.06 of P, no more than 0.03 of S, 0.02-0.05 of Re, 0.02-0.06 of Mg, 0.40-0.60 of Cu, 0.01-0.05 of Sb and the balance of Fe. The copper-antimony alloy spheroidal graphite cast iron material for the crank shafts can ensure that the mechanical strength of the spheroidal graphite cast iron crank shaft is greatly enhanced, the defective rate of the copper-molybdenum alloy spheroidal graphite cast iron crank shaft and the potential risk of shrinkage porosity of the crank shaft core are reduced, the production cost is greatly lowered and the economic value of the copper-antimony alloy spheroidal graphite cast iron crank shaft is increased.

The invention discloses a control method for increasing the number of graphite nodules by solid solution strengthening ferrite nodular cast iron with a thick and large cross section, which comprises the following steps: selecting materials: 50-70 percent of pig iron and 30-50 percent of scrap steel; smelting: adding the materials into an electric furnace for smelting, wherein the tapping temperature of the molten iron is 1420-1450 DEG C; spheroidizing: adding a spheroidizing agent, adding a covering agent on the spheroidizing agent, and then spheroidizing, wherein the spheroidizing temperatureis 1420-1450 DEG C; inoculating: adding a silicon-aluminum-calcium-barium type inoculant during a primary inoculation, and respectively adding the inoculant on the surface of the covering agent and the other side of a ladle dam before tapping, wherein the distribution proportion is 50 percent; adding a trace amount of alloy Sb along with the flow of the molten iron during casting, wherein the adding amount of the alloy Sb is 0.003-0.005% of the total amount of the molten iron, molding, casting and cooling: ensuring that the casting opening temperature is controlled to be <= 300 DEG C, and thecasting is obtained by air cooling after the casting is opened. The control method has the advantages of obtaining higher number of the graphite nodules, ensuring a metallographic structure and goodconsistency of performance indexes, thereby improving the quality of the castings and prolonging the service life.

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 pipe powder for nodular cast iron. The formula of the pipe powder comprises the following components in percentage by weight: 62-70% of Si, 3-10% of Ba, 1-2% of Ca, 0.8-1.8% of Al, 0.5-1.5% of Fe3O4, the balance of Fe and inevitable microelements. According to the pipe powder for the nodular cast iron disclosed by the invention, the overall performance of the nodular cast iron can be improved, and the inoculation efficiency is improved.

The invention discloses an acid-resisting, high-toughness and high-wear-resisting cast ball and a preparing method thereof. The preparing method includes the following steps that S1, smelting is conducted in a smelting furnace, and iron liquid is obtained; S2, an aluminum ingot is added into the iron liquid for deoxygenation before the iron liquid is discharged out of the furnace, then the iron liquid is transferred into a transferring ladle, after slagging off is conducted, the iron liquid is poured into a pouring ladle for pouring, and a cast blank is obtained after cooling; and S3, the castblank is heated to 500 DEG C to 510 DEG C for heat insulation for 2 h to 3 h, the temperature is then increased to 780 DEG C to 790 DEG C for heat insulation for 2 h to 3 h, then the temperature is increased to 940 DEG C to 950 DEG C for heat insulation for 2 h to 3 h, then the temperature is then increased to 1015 DEG C to 1030 DEG C for heat insulation for 2 h to 3 h, quenching oil is used forquenching for 10 min to 15 min, finally, tempering treatment is conducted after heat insulation is conducted for 6 h to 8 h at the temperature of 260 DEG C to 280 DEG C, and the cast ball is obtained.The cast ball prepared through the method has good acid-resisting and corrosion-resisting performance, in addition, the hardness is high, the wear-resisting performance is good, and economic benefitsare better increased.

The invention relates to the technical field of new material machining, and discloses a method for improving the application performance of nodular cast iron on a mine car wheel. The influence of a nodular cast iron smelting process on product performance is explored by researching composite nanoparticles, the prepared composite nanoparticles, inoculant and nodulizer are added into a casting ladle, molten iron is further poured into the casting ladle, the high-strength nodular iron casting is prepared, the performance of the nodular cast iron is comprehensively improved, and the operation safety and the service life of a cast iron ore wheel are prolonged; and the application performance of the nodular cast iron on the mine car wheel can be remarkably improved, the defect problem of replacing cast steel with the nodular cast iron is solved, the strength and toughness of the nodular cast iron are improved, the chemical and mechanical properties are stable, the forming performance is good, the application occasion is expanded, and the economic benefit and the safety benefit are remarkably improved.

An improved ball grid array package BGA, which can prevent the impact between solder balls and improve integration, includes: a substrate with a first surface and a second surface higher than the first surface; at least one semiconductor chip, which is Stacked and arranged on the first surface, a plurality of pads are provided on the upper surface; a plurality of leads are provided on the substrate, one end of which is connected to a part of the pads of the semiconductor chip, and the other end is exposed on the second surface On: a plurality of conductive solder balls are formed on the surface of the semiconductor chip and the second surface of the substrate, and are electrically connected to the pads of the semiconductor chip and the leads exposed on the second surface of the substrate.

The invention belongs to the technical field of cast iron casting, and discloses a method for forming a main lubricating oil passage of a nodular cast iron diesel engine body and application. A bottom-pouring open-type gating system with a filter device is adopted to purify molten iron, a feeding head is arranged at the thermal center part of the main lubricating oil passage, and cold iron is usedin cooperation to balance the temperature field of nodular cast iron; and the stokehold chemical composition, reasonable charging, multi-stage inoculation, duration control, good nodularization, thorough slagging-off and fast pouring parameters are determined according to the principles of high carbon equivalent and high carbon and low silicon, and internal compaction of the thick and large thermal center part is performed to eliminate shrinkage and slag inclusion inside the main lubricating oil passage of the engine body. The method is beneficial to realizing the basic balance of the temperature field of the nodular cast iron. The method guarantees the high quality of the molten iron, realizes the internal compaction of the thick and large thermal center part, eliminates the quality risks of shrinkage and slag inclusion defects inside the main lubricating oil passage of the engine body, and overcomes the shrinkage casting defect of the main lubricating oil passage of the complicatednodular cast iron diesel engine body.

The invention discloses a preparation technology of a wear-resistant and high-hardness wear-resistant plate and a scraper conveyor comprising the wear-resistant plates. The scraper conveyor comprises two racks, a driving shaft is arranged between the two racks, bearing seats matched with the driving shaft are arranged in the racks, chain wheels are arranged in the middle of the outer surface of the driving shaft and located between the two racks, chains are arranged on the chain wheels, a plurality of scrapers are arranged on the chains, the wear-resisting plates are arranged on the scrapers, and one end of the driving shaft penetrates through one rack and is connected with the output end of a driving motor. The preparation technology and the scraper conveyor have the beneficial effects that high carbon content contributes to graphitization and promotes magnesium absorption, so that all or most of carbon is spherical graphite, and the wear-resistant effect of the wear-resistant plate is enhanced.