45results about How to "Improve ball effect" patented technology

The invention relates to a casting process of a nodular cast iron planet carrier, which comprises the following procedures of modeling, iron melt melting, spheroidizing, modifying, casting and stress relieving and annealing. The design of a casting system adopts a step casting method which takes consideration of both bottom casting and top casting to improve the finished product rate of castings, and also adopts technical schemes of placing chill iron at the position of thick walls, adding Sn element in the iron melt, optimizing, spheroidizing, modifying, casting and the like, so that the produced planet carrier not only meets the high demands on property, but also achieves great improvement in production cost and efficiency.

The invention relates to a roller-type spheroidizing annealing production line and an isothermal spheroidizing annealing method using the roller-type spheroidizing annealing production line. The roller-type spheroidizing annealing production line sequentially comprises a roller-type feeding table, a cooling device, a heating device, a roller-type discharging table and an upper computer control system, wherein the cooling device comprises a roller-type quick cooling furnace and a forced quick cooling chamber at the tail end of the roller-type quick cooling furnace; a workpiece conveying device is arranged inside the roller-type quick cooling furnace; and the workpiece conveying device has a double-layer structure and comprises an upper cold workpiece feeding device and a lower hot workpiece discharging device. The isothermal spheroidizing annealing method comprises the following steps: feeding, exchanging heat of a cold workpiece and a hot workpiece in the furnace, austenitizing the workpieces, performing isothermal treatment, cooling and outputting the workpieces, discharging and the like. The isothermal spheroidizing annealing method is wide in application, can be applied to spheroidizing annealing treatment of parts or raw materials on a large scale as well as isothermal normalizing treatment of the parts; and the roller-type spheroidizing annealing production line has the advantages of energy conservation, environment friendliness, small floor area, high production efficiency and the like.

The invention relates to a spheroidizing treatment technology by rush-in method, comprising the following steps: adding a nodulizer and an inoculant successively in a ladle pit or a dam; using a ductile iron plate to cover the nodulizer and the inoculant; scattering a covering agent on the ductile iron plate; dumping molten iron into the ladle; scattering a slag collecting agent after the spheroidizing reacts sufficiently, and removing the slag. By covering the nodulizer and the inoculant with the ductile iron plate and the covering agent successively, the covering agent containing perlite expands rapidly under the condition of instantaneous high-temperature to form a protective layer, so that the temperature of the spheroidizing reaction is reduced, the time of the spheroidizing reaction is prolonged and the spheroidization effect is improved.

The invention discloses a preparation method of high-strength and high-tenacity nodular cast iron. The high-strength and high-tenacity nodular cast iron is prepared from, by mass, 3.6%-3.8% of C, 3.5%-3.8% of Si, 0.4%-0.6% of Mn, 0.01%-0.04% of Sn, 0.4%-0.6% of Ni, 0.3%-0.4% of Ti, 0.04%-0.01% of Sb, 0.02%-0.04% of RE, 0.16%-0.2% of P, no more than 0.02% of S, and the balance Fe and inevitable impurities. The tensile strength of the nodular cast iron is 1050-1180 MPa, the yield strength of the nodular cast iron is 780-820 MPa, the ductility of the nodular cast iron is 15%-16%, the nodularity of the nodular cast iron is 95%, and all properties of the nodular cast iron are excellent.

The invention discloses high-fluidity environment-friendly ultrahigh-performance concrete. The concrete is prepared by mixing low-heat Portland cement, fly ash microspheres, silica fume, fine sand, quartz powder, a water reducing agent, water and steel fibers according to a certain ratio. Pollution is produced during production of cement; however, waste fly ash microbeads of a thermal power plantare adopted to replace a part of cement in the invention, so pollution reduction and environmental protection are realized, and the obtained ultrahigh-performance concrete has very good working performance, relatively small shrinkage and relatively good crack resistance, and is convenient to construct; and compared with existing ultrahigh-performance concrete with the same water-binder ratio, glue-sand ratio and steel fiber mixing amount, the ultrahigh-performance concrete has the advantages that working performance is greatly improved, and the problem of poor working performance of the existing ultrahigh-performance concrete can be solved, so the ultrahigh-performance concrete has good economic benefits and environmental protection benefits and is suitable for large-scale popularization and application.

The invention belongs to the field of casting equipment and in particular relates to a spheroidizing device and a working method thereof. The spheroidizing device comprises a ladle body and spheroidizing ladle head covers covering the top and an inlet/outlet of the ladle body, wherein each spheroidizing ladle head cover comprises a cover body covering the top of the ladle body, a cover cap covering the inlet/outlet of the ladle body and a driving mechanism suitable for driving the cover cap to move so as to open the inlet/outlet of the ladle body, so that molten iron enters the ladle body or flows out of ladle body is being poured.

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 casting method of a high-powered engine box casting. The casting method comprises the steps of preparing moulding sand, performing modeling and core making to obtain a sand mould, preparing pouring iron liquid, taking pig iron, foundry returns and waste steel as raw materials to be fed into a smelting furnace to be smelted, carrying out in-package inoculation and spheroidization on the smelted iron liquid, carrying out stream inoculation before tapping, then carrying out tapping, pouring the iron liquid into the sand mould, carrying out stream inoculation, adopting acold iron riser process for feeding and temperature control, forming a casting after pouring is finished, and carrying out treatment on the formed casting. The obtained casting is good in quality, andquality problems of core clamping, shrinkage, cracks and the like are not prone to happening.

The invention discloses a melting process method for eliminating a reverse chill phenomenon of nodular cast iron. Raw materials are strictly required, and pig iron, scrap steel, carburant, silicon carbide, nodulizer, inoculant and in-flow inoculant are selected. The melting process method comprises the following steps of performing charging and melting, performing hardening and tempering, performing molten iron pretreatment, performing spheroidizing inoculation, performing pouring inoculation and performing casting unpacking. According to the melting process method for eliminating the reversechill phenomenon of the nodular cast iron, the reverse chill phenomenon is solved through three aspects of selection of the raw materials, guarantee of the contents of c and s, improvement of the solubility of rare earth and inoculation treatment, the percent of pass of products is improved, and the economic benefit of enterprises is improved.

The invention relates to an endogenous Cu6Sn5 particulate reinforced tin and silver based lead-free composite solder alloy and the preparation method, belonging to the technical field of manufacturing lead-free solder for electronic assembly in the microelectronic industry. The composite solder prepared by a traditional endogenous method has uneven distribution of the endogenous particles, and the technology and mechanical property of solder are influenced. The composite solder of the invention is composed of Cu6Sn5 reinforced particles and the eutectic alloy of Sn-3.5Ag; the volume percentages of the two components are respectively 20 percent and 80 percent. The invention is characterized in that potassium chloride and lithium chloride are mixed and melted according to the weight percentage of 1.3:1, and then poured on the eutectic alloy of Sn-3.5Ag; when the eutectic alloy of Sn-3.5Ag is melted, Cu and Sn particles are added; the mixture is preserved at the temperature of 450 DEG C, stirred and staying silently; then the mixture is rapidly cooled to room temperature at a rate of 20, 2, 0.6 or 0.1 DEG C/sec; the complex solder of the invention is obtained by removing mixed salt. The complex solder of the invention has the advantages of low cost, convenient smelting, and good mechanical property and creep resistance.

The invention discloses a spheroidisation reaction package for producing ductile cast iron and a spheroidisation method therefor, belonging to the field of casting. The reaction package is composed of a package body, a package wall and a rotatable fishhook; wherein, the fishhook is connected with the package body by a bolt; the reaction package is characterized in that a convex plate with a groove is arranged at the bottom part of the package body, the convex plate is located at one side of the center of the package bottom; a reaction tube is arranged in the groove, three small air holes are arranged on tube wall of the reaction tube and are on a straight line. When the reaction tube is filled with nodularizers, under the heat effect of molten iron, the thinnest part of the tube wall of the reaction tube begins to melt; with the gradual melting of the tube wall, the nodularizers sequentially enter the molten iron to facilitate the nodularization reaction to be carried out under controllable conditions; as passivation magnesium serves as the nodularizers, thus putting off the reaction time between the magnesium and the molten iron, lengthening the contact time between magnesium vapor and the molten iron, improving absorptivity of the molten iron and increasing nodularization effect of magnesium.

The invention discloses a plasma-arc nodulizing device for iron-based intermediate alloy powder. The plasma-arc nodulizing device and method for the iron-based intermediate alloy powder comprises an atmospheric reaction cavity and a plasma-arc power supply. A plasma-arc spray gun is fixedly mounted at the top of the atmospheric reaction cavity. The upper portion of the plasma-arc spray gun communicates with a powder delivery mechanism. A porous powder-dispersion outlet plate is mounted at the lower end of the plasma-arc spray gun. A lifting mechanism is fixedly connected to the inner wall of the atmospheric reaction cavity through a hollow supporting plate. A rotary clamping mechanism is mounted at the upper end of the lifting mechanism. A conical carbon bar is vertically upwards mounted on the upper portion of the rotary clamping mechanism. The positive electrode of the plasma-arc power supply is connected with the plasma-arc spray gun through a wire, and the negative electrode of theplasma-arc power supply is connected with the conical carbon bar through a wire. By the adoption of the plasma-arc nodulizing device for the iron-based intermediate alloy powder, the problem of electric-arc electrodes for plasma-arc power nodulizing is effectively solved, and the phenomenon of instable plasma arcs caused by losses of the conical carbon bar is avoided. The powder nodulizing effectis improved.

The invention discloses a spheroidizing and inoculating process for spheroidal graphite cast iron. The spheroidizing and inoculating process comprises the following steps that materials are prepared,wherein the total amount of a required nodulizing agent and a nucleating agent is determined according to the total amount of molten iron, and the nodulizing agent and the nucleating agent are dried;alloy is loaded into a ladle, wherein the nodulizing agent, the part of the nucleating agent and a covering agent are sequentially loaded into the ladle; spheroidizing is carried out, wherein part ofthe molten iron is quickly poured into the ladle, and the rest of the nucleating agent and the remaining molten iron are added when the spheroidization reaction approaches the tail sound; and the treatment is finished, wherein slagging is carried out after the spheroidizing treatment is finished, and floating silicon is added to inoculate and cover a heat preservation agent to be lifted to a pouring site after slagging. According to the spheroidizing and inoculating process, the molten iron is poured into the ladle twice, most of the molten iron is mixed with the nodulizing agent first, so that the molten iron poured into the ladle in advance is fully reacted with the nodulizing agent, then the rest molten iron is poured, and therefore the spheroidization effect can be effectively improved. The invention is applied to the field of casting.

The invention relates to a silicon-magnesium ferroalloy nodulizer, which is characterized in that the nodulizer comprises the following compositions by weight percentage: 5 to 15 percent of magnesium, 37 to 52 percent of silicon, and the balance being iron. The nodulizer can give full play to the advantages of various spheroidizing elements, improve the spheroidizing effect, and meet the demands of different production conditions and different structural castings by adjusting the content of the spheroidizing elements, has stable reaction, is easy to operate, and makes spheroidization stable. Simultaneously, due to increased crystal nucleus, the grain size of the castings is finer, so that the nodulizer not only has the enhancing function but also can reduce the chilling tendency.

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 relates to the technical field of wear resisting balls, in particular to a high-quality wear resisting ball and a preparation process thereof. The high-quality wear resisting ball comprises the following elements in percentage: 2.6-3.5% of C, 1.5-2.4% of Si, 0.4-0.9% of Mn, 1.5-2.0% of Cr, 0.003-0.01% of Nd, 0.005-0.01% of Te, 0.05-0.1% of Cu, 0.001-0.005% of B, 0.1-0.5% of Zn, 0.01-0.04% of Sr, P not more than 0.05%, S not more than 0.05%, and the balance of Fe. The wear resisting ball effectively makes up the defects of low hardness and easy corrosion in a traditional wear resisting ball to a certain extent.

The invention relates to a preparation method of a copolymer of olefin and unsaturated carboxylic acid and the copolymer prepared by the method. The method comprises the step of polymerizing olefin and unsaturated carboxylic acid in the presence of a catalyst, an improver, an optional chain transfer agent and an improver, wherein the used catalyst comprises a diimine metal complex as shown in a formula I which is described in the specification. The spherical and/or sphere-like polymer prepared by the preparation method has a good prospect in industrial application.

The invention relates to a preparation method of a polar group-containing copolymer and the polar group-containing copolymer prepared by the method. The preparation method of the polar group-containing copolymer comprises the following step: carrying out polymerization reaction on olefin and olefin alcohol in the presence of a catalyst, an improver and an optional chain transfer agent, wherein the used catalyst comprises an amino imine complex as shown in a formula I. The spherical and/or sphere-like polymer prepared by the preparation method has a good prospect in industrial application.

According to the preparation method of the large-tonnage nodular iron casting, the number of balls is large, spheroidization is uniform, spheroidal graphite distortion is small, and the deformation amount of the casting in a casting state is small. The preparation method creatively adopts a ladle-to-ladle spheroidization to adjust the temperature so that the temperature can be controlled, and a four-time composite inoculation block technology is adopted; the number of large-tonnage ductile iron graphite nodules in a cast state is remarkably increased, and finally it can be guaranteed that the number of cast nodules is large, spheroidizing is uniform, deformity is avoided, and the mechanical property is guaranteed; meanwhile, the compacted blocky inoculant is adopted to inoculate the molten iron before and after spheroidizing, slow-release inoculation is achieved through multiple times of slow release, the molten iron fully exists in a temperature and concentration fluctuation area, and therefore the graphite nodules are numerous, round and uniform; according to the method, the spheroidal graphite can be stably obtained, the distortion is small, and the high elastic modulus can be obtained, so that the deformation of a casting in an as-cast state is reduced.

A rare-earth silicon-magnesium nodulizer is characterized in that the nodulizer comprises the following components by weight percentages: 25-35% of cerium in light rare-earth silicon magnesium, 37-52% of yttrium in heavy rare earth; 15-25% of silicon and 5-15% of magnesium. The rare-earth silicon-magnesium nodulizer further contains neodymium accounting for 5-8% of the total weight. In the rare-earth silicon and magnesium, the cerium in the light rare-earth silicon and magnesium and the yttrium in the heavy rare earth have obvious effect on graphite nodulizing. Firstly, the boiling point of the rare-earth silicon magnesium is higher than that of the magnesium, thus molten iron does not churn and splash when the rare-earth silicon magnesium is added to the molten iron; secondly, cerium-yttrium based rare-earth silicon magnesium has stronger desulfurization and deoxidation capacity than the magnesium, and the generated compounds such as sulfidized rare earth, oxide rare earth and the like have high melting point and good stability; and thirdly, the rare-earth silicon magnesium and nodulizing interference silicon magnesium in the molten iron can form a stable compound, thus the rare earth containing nodulizer has stronger anti-interference capacity than a magnesium nodulizer.