1175 results about "Ductile iron" patented technology

A cast image enhancement method for metallographic analysis is disclosed. According to the method, a casting metallographic image is collected, analysis and feature recognition of the casting metallographic image are carried out at the rear end through an image processing and analysis algorithm based on artificial intelligence and deep learning, and therefore multi-dimensional representation features related to a casting metallographic phase are captured from the casting metallographic image, and enhancement processing of the casting metallographic image is carried out. In this way, analysis and control over the nodular cast iron inoculation process can be conducted more finely in the follow-up process, and reliable support is provided for production quality control over materials such as nodular cast iron.

The invention relates to the technical field of elbow polishing, and discloses a spheroidal graphite cast elbow casting polishing device which comprises a polishing table, a supporting table and a pair of placing tables are arranged at the top of the polishing table, a bent section of an elbow is placed above the supporting table, a straight section of the elbow is placed above the two placing tables, and motors are arranged on one sides of two ports of the elbow. Output shafts of the motors are fixedly connected with connecting rods, the outer walls of the connecting rods are fixedly connected with a first polishing cutter and a second polishing cutter, the diameter of the first polishing cutter is the same as the outer diameter length of the bent pipe, the diameter of the second polishing cutter is the same as the inner diameter length of the bent pipe, and an adjusting assembly used for driving the two containing tables to conduct position adjustment is arranged below the containing tables. And a chipping removing assembly for treating chippings on the inner wall of the pipeline is arranged on the side, away from the motor, of the second polishing knife, the chippings generated by polishing of the inner wall of the pipeline can be removed in time through the chipping removing assembly, and the situation that the chippings cause unsmooth or blocking of the pipeline, and consequently follow-up use of the bent pipe is affected is avoided.

The invention discloses a ductile iron dead-head-free casting process which comprises the following steps: S1, a casting mold modeling step: filling cavities of an upper half casting mold and a lower half casting mold with dry mold sand before casting, and arranging a pouring system in the cavities of the upper half casting mold and the lower half casting mold; s2, nodular cast iron smelting, wherein raw materials of nodular cast iron are put into a cupola furnace to be smelted; step S3, spheroidizing and in-ladle inoculation treatment: performing spheroidizing by adopting a dam type flushing method, putting a spheroidizing agent into a ladle pit, tamping, covering the spheroidizing agent with a thin layer of silicon iron and cast iron scraps, performing in-ladle inoculation through an inoculant, and removing scum on the surface of the molten iron after the molten iron reacts stably; s4, pouring is conducted, specifically, the molten iron is poured into a sprue, and stream inoculation is conducted by adding an inoculant in the pouring process; and S5, cooling forming is conducted, specifically, after the casting is cooled and solidified, the casting is taken out, and a sand layer on the surface of the casting is taken out.

The invention discloses a laser cladding preparation method for improving the wear resistance of a cladding layer by doping tungsten carbide. According to the method, cladding process parameters are preliminarily obtained based on finite element heat flow analogue simulation, cladding layer preparation is carried out, cladding quality characterization is carried out to obtain the optimal cladding process parameters, and finally the cladding layer with the wear-resistant characteristic is obtained. The method comprises the following steps: firstly, constructing a heat flow coupling three-dimensional model, carrying out grid division, establishing a heat source model, defining thermophysical parameters of tungsten carbide (10-15%) nickel alloy composite powder and a matrix, and determining simulated boundary conditions; setting a multi-factor process parameter combination to carry out numerical simulation calculation, and determining laser processing process parameters of laser power, scanning speed and light spot diameter; preparing a cladding layer on the surface of the nodular cast iron by using tungsten carbide (10-15%) nickel alloy composite powder through a laser cladding method; and carrying out microscopic morphology and microhardness experiments to carry out quality analysis verification on the cladding layer, determining the optimal process parameters of laser power, scanning speed and light spot diameter when the cladding layer has no obvious defect morphology and the hardness is higher than that of the raw material, and obtaining the laser cladding preparation method for improving the wear resistance of the cladding layer by doping tungsten carbide. The invention provides a new research method and a high-quality preparation approach for improving the wear resistance of the cladding layer by tungsten carbide, and can be widely applied to the fields of strengthening and repairing mining machinery, aerospace parts and the like.

The invention discloses a rapid development method and system for a high-performance nodular cast iron material based on electronic metallurgy, and relates to the technical field of electronic metallurgy, and the rapid development method comprises the steps that a high-performance nodular cast iron raw material is smelted through multi-stage electron beams, and uniform molten metal is obtained; monitoring the chemical components and temperature change of the molten metal in real time, and dynamically adjusting the addition of the spheroidizing agent; the pouring speed and pressure of the molten metal subjected to spheroidizing treatment are intelligently controlled, and casting pouring is conducted; the internal stress change of the casting is monitored in real time through an embedded stress sensor, and the casting cooling process is adjusted; the cooled casting is subjected to surface treatment, heat treatment and machining; component detection and performance testing are conducted on the casting obtained after treatment and machining are completed; through the multi-stage electron beam melting technology, accurate control over the temperature and chemical components of the molten metal is achieved, and the uniformity and stability of the molten metal are ensured.

The invention relates to the technical field of intelligent manufacturing, in particular to a nodular cast iron alloy component self-adaptive optimization method and system based on artificial intelligence, and the method comprises the following steps: obtaining furnace temperature and component parameters, generating a stable comparison legend, screening offset abnormal combinations to form an available set, extracting performance curve characteristics to construct a trend chart, and obtaining a nodular cast iron alloy component self-adaptive optimization result. And superposing the structural parameters and the element distribution positioning segregation area, and outputting feeding correction parameters to generate an optimization scheme. According to the method, normalization processing is carried out on furnace temperature, carbon-silicon ratio and other multi-factor offset values, a component offset map is constructed, trend feature extraction and sorting of response curves under multiple working conditions are combined, component combinations with stable performance are screened out, a mapping relation is established through the structural curvature, the wall thickness slope and the injection rate, and a spatial coincidence map is generated through coincidence analysis. And the feeding direction and the injection rate are inversely calculated, dynamic adaptation of components and the structure is achieved, and the structure uniformity and the performance consistency are improved.

The invention relates to the technical field of nodular cast iron, in particular to a silicon-molybdenum-chromium-nickel-niobium nodular cast iron material and a preparation method thereof. The material comprises the following chemical components in percentage by mass: 3.0%-3.5% of carbon, 4.3%-4.7% of silicon, 0.1%-0.3% of manganese, less than or equal to 0.05% of phosphorus, less than or equal to 0.02% of sulfur, 0.7%-1.0% of molybdenum, 0.6%-0.8% of chromium, 0.4%-0.7% of nickel, 0.3%-0.6% of niobium, 0.03%-0.06% of magnesium, 0.05%-0.1% of rare earth, 0.006%-0.012% of antimony and the balance of iron. The preparation method comprises the steps of smelting, first-time spheroidizing and inoculation, second-time spheroidizing, second-time inoculation and heat treatment in sequence. According to the obtained nodular cast iron material, the form of graphite and the number of graphite nodules are improved, carbon elements are separated out as many as possible in the form of high-carbon phase-spheroidal graphite, generation of pearlite is reduced, and the mechanical strength and high-temperature resistance of nodular cast iron are improved.

The invention discloses a nodular cast iron component and process design method based on an active learning strategy, and belongs to the technical field of material process design. In order to improve the prediction precision and design efficiency of material process design, the method comprises the following steps: collecting experimental data including nodular cast iron components, process, microstructure characteristics and performance in literatures; constructing a nodular cast iron component-process-microstructure characteristic model and a nodular cast iron component-process-microstructure characteristic-performance model, setting different weights for different target performances based on an optimization algorithm, and obtaining optimized nodular cast iron components and process parameters with different performance requirements by adopting a weight-based target function; and through an active learning strategy, data with relatively large uncertainty is preferentially selected for experiment and is supplemented to a data set, then model updating is performed, model prediction precision is optimized, and finally nodular cast iron components and process parameters meeting expected performance requirements are designed. The experiment frequency and cost are reduced.

The invention relates to the technical field of turning equipment, and discloses a nodular iron self-aligning roller cage pocket hole machining device and process, and the nodular iron self-aligning roller cage pocket hole machining device comprises a turning mechanism, a clamping mechanism and an overturning mechanism; the turning mechanism comprises a cross beam assembly with a turnover function, a turning assembly used for carrying out pocket turning on the retainer and two supporting beam assemblies with a linear displacement function, and the turning assembly and the turnover mechanism are arranged on the two different side faces of the cross beam assembly respectively. The overturning mechanism is arranged to be matched with the assembled clamping mechanism for use, in the turning process, the function of rapidly and automatically overturning the retainer can be achieved, assistance of external hoisting equipment is not needed, manual cooperation is not needed either, the overturning difficulty of the retainer is lowered, the overturning speed is increased, and the machining efficiency is improved. And the method can be well suitable for batch pocket hole turning machining scenes of oversize ductile iron self-aligning roller retainers.

The invention discloses high-spheroidization-rate spheroidal graphite cast iron for silicon carbide auxiliary spheroidization inoculation and a preparation method thereof, and belongs to the technical field of metal material casting. The preparation method of the high-spheroidization-rate nodular cast iron for silicon carbide auxiliary spheroidization inoculation comprises the six steps of preparation of an auxiliary spheroidizing agent, preparation of an auxiliary nucleating agent, burdening, smelting, spheroidization inoculation and pouring. The tensile strength of the obtained nodular cast iron casting finished product is 463-498 MPa, the yield strength is 310-320 MPa, the elongation is 7.2-9.8%, the brinell hardness is 180-220, the minimum impact energy is 49-55 J, the graphite spheroidization level is 1-2 levels, the spheroidization rate is 95-97%, and the size level of graphite nodules is 6-7 levels.

The invention relates to a casting method of an isothermal quenching nodular cast iron subway wheel, and belongs to the technical field of casting. Comprising the steps of manufacturing a subway wheel casting mold; the method comprises the following steps: firstly, manufacturing a subway wheel metal mold comprising a pouring system, and placing a graphite block and a heating and insulating riser at a mold position corresponding to a large-thickness part of a subway wheel casting or a high-structure-compactness part of the wheel casting; then, an iron mold, graphite and precoated sand composite subway wheel pouring mold is manufactured through a core making machine; proportioning the components of the casting liquid and smelting the components; the smelted pouring liquid is subjected to a spheroidizing inoculation reaction, after the spheroidizing inoculation reaction is completed, the temperature is controlled, pouring is conducted on the manufactured pouring mold, and stream inoculation is adopted in the pouring process; and after pouring is completed, isothermal quenching post-treatment is conducted on the subway wheel casting. According to the casting technology, the solidification process of the casting is controlled to be sequential solidification, it is guaranteed that no isolated hot spot exists in the solidification process of the casting, and the quality of the casting with high internal density is obtained.

The invention belongs to the technical field of nodular cast iron manufacturing, and relates to low-temperature nodular cast iron and a preparation method and application thereof.The low-temperature nodular cast iron has the CEL of 4.25-4.3 and comprises, by mass, 3.4%-4.0% of C, 1.8%-2.3% of Si, smaller than or equal to 0.2% of Mn, smaller than or equal to 0.02% of S, smaller than or equal to 0.03% of P, 1.2%-1.6% of Ni and the balance Fe. The preparation method comprises the steps of raw material selection, burdening, smelting, spheroidizing inoculation, pouring and the like. Under the as-cast condition of the low-temperature nodular cast iron, at the normal temperature and the temperature as low as-40 DEG C, the tensile strength sigma b is larger than or equal to 450 MPa, the elongation is larger than or equal to 10%, and the average impact absorbing energy AKV of a sample with a V-shaped notch is larger than or equal to 10 J. According to the low-temperature nodular cast iron, the production cost of materials can be reduced, and the application range and application field of the low-temperature nodular cast iron can be widened; the application problem that the composite material needs to be applied in a low-temperature environment and needs parts with high strength and high plasticity and toughness is solved.

The invention discloses a high-performance heterogeneously-welded special-shaped combustion chamber piston and a preparation method thereof, a special-basin-shaped combustion chamber and an oil duct structure are directly formed through a rolling process, and heterogeneously-connected between a head part and a skirt part of the piston is realized in combination with a nitrogen protection friction welding technology. The piston head is made of low-silicon high-chromium ferrite-based alloy, the skirt is made of quenched and tempered steel, non-quenched and tempered steel or nodular cast iron, and the welding face is designed to be in a wave shape so as to enhance the bonding strength. The preparation process comprises vacuum smelting, multi-pass rolling, precise welding and surface treatment, the combustion efficiency, the lightweight level and the reliability of the piston are remarkably improved, and the piston is suitable for high-load working conditions such as diesel engines and natural gas engines.

The invention discloses a sand mold casting forming device for nodular cast iron production, and relates to the technical field of nodular cast iron production, the sand mold casting forming device comprises a base, a first mounting groove is formed in the top of the base, and four supporting rods are fixedly mounted at the positions, located on the two sides of the first mounting groove, of the top of the base; a top plate is arranged among the tops of the four supporting rods, a hydraulic cylinder is fixedly mounted at the top of the top plate, the output end of the hydraulic cylinder penetrates through the top plate and is connected with a lifting plate, a displacement mechanism is arranged in the first mounting groove, and a clamping mechanism is arranged outside the displacement mechanism. Through lead screw transmission and motor driving of the displacement mechanism, automatic transfer of a sand mold is achieved, the clamping mechanism automatically drives a clamping plate to clamp the sand mold in the transfer process through cooperation of a guide plate and a first rolling wheel, a first spring provides buffering clamping force, the stability during pouring is guaranteed, the situation that the mold is damaged due to excessive clamping is avoided, and the production efficiency is improved. Clamping is automatically relieved during resetting, and operation is convenient.

The invention provides a nodular cast iron material and a preparation method and application thereof. The preparation method of the nodular cast iron material comprises the following steps that S1, a mixture of pig iron, low-manganese waste steel and foundry returns is heated to be completely molten, alloy and auxiliary materials are supplemented and adjusted to target components, and base iron is obtained; s2, a spheroidizing agent is added into the base iron to conduct spheroidizing treatment, ladle-to-ladle inoculation is conducted after spheroidizing treatment, and an efficient inoculant is added during ladle-to-ladle inoculation; s3, pouring is conducted, and during pouring, a long-acting stream inoculant is added for instantaneous inoculation; and S4, carrying out vibration aging treatment to obtain the nodular cast iron material. According to the nodular cast iron material, collaborative upgrading is achieved in the three dimensions of graphite form-matrix strength-thermal stress dissipation, in a bench test, the number of hot cracks is greatly increased, the service life is obviously prolonged, and reliable guarantee is provided for braking safety of heavy vehicles.

The invention discloses a casting system for preparing a nodular cast iron brake disc, and belongs to the technical field of casting, the casting system comprises a casting platform, a casting molding seat is arranged on the casting platform, the casting molding seat is connected with a preparation casting table through a centrifugal rotating assembly, and a plurality of modular casting bodies are uniformly distributed on the upper surface of the preparation casting table; a temperature control device is arranged on the modular casting body, and a regulation and control opening and closing motor is arranged in the preparation casting table and connected with the modular casting body through a joint control assembly. According to the invention, traditional center casting is set into a multi-module modular casting body for sub-module casting, and the fluidity of nodular cast iron casting liquid in the casting process is reduced under the action of centrifugal force, so that the situation that graphite which is not easy to flow is gathered around due to relatively high fluidity is avoided; graphite gradually converges towards the middle under the action of small fluidity, the graphite distribution uniformity of a cast nodular cast iron brake disc casting can be guaranteed, and the quality of the nodular cast iron brake disc is guaranteed.

The invention discloses a nodular cast iron well lid casting forming assembly line, and particularly relates to the technical field of well lid casting forming, the nodular cast iron well lid casting forming assembly line comprises two conveying lines used for conveying molds, a first support, two friction gear rings fixed at the upper end of the first support, a supporting ring, an upper mold and a lower mold; and overturning assemblies used for overturning the upper mold and the lower mold are symmetrically arranged between the two supporting rings, and opening building assemblies are arranged at the ends, close to each other, of the two supporting rings correspondingly. According to the nodular cast iron well lid casting forming assembly line, the design of the opening forming assembly is adopted, so that a pouring opening can be formed in part of clay sand of the upper mold through scraping, the design of the overturning assembly is adopted, mold closing can be automatically completed after the pouring opening is formed in the device, operation of the device is facilitated, and the production efficiency is improved. The working efficiency of the device is improved, the design of a guide groove is adopted, scraped powder can fall out along the guide groove, and the device is more stable during use.

The invention provides a method for on-line detection of spheroidization rate and shrinkage porosity index of nodular cast iron, which comprises the following steps: pouring molten iron subjected to spheroidization into a thermal analysis sample cup, recording the change rule of the temperature of the molten iron in the thermal analysis sample cup along with time, and drawing a cooling curve of solidification time-temperature; according to the shape of the cooling curve, determining which of a hypoeutectic solidification mode, a near-eutectic solidification mode and a hypereutectic solidification mode the solidification mode of the spheroidized iron liquid belongs to; different calculation formulas are adopted for predicting the nodularization rate and the shrinkage porosity index of the nodular cast iron according to the three different solidification modes. The method comprises the following steps: drawing a cooling curve between solidification time and temperature of molten iron, carrying out numerical differential treatment on the curve to obtain a temperature value of a feature point, and judging which solidification mode of the molten iron belongs to a hypoeutectic solidification mode, a near-eutectic solidification mode and a hypereutectic solidification mode according to the shape of the cooling curve. And further calculating the spheroidization rate and shrinkage index of the spheroidized molten iron through a formula.

The invention relates to the technical field of cast aluminum-silicon alloys, in particular to a low-cost ultrahigh-toughness cast aluminum-silicon alloy material and a preparation method thereof. The aluminum-silicon alloy material comprises the following components in percentage by weight: 7.0%-9.0% of silicon, 0.30%-0.50% of magnesium, 1.60%-2.00% of copper, less than or equal to 0.2% of zinc, less than or equal to 0.2% of iron, 0.20%-0.40% of manganese, less than or equal to 0.2% of chromium, 0.05%-0.3% of zirconium, 0.03%-0.2% of titanium, less than or equal to 0.04% of strontium and the balance of aluminum and other impurities. Wherein the total content of other impurities is less than or equal to 0.15%, and the content of a single impurity is less than or equal to 0.05%. The aluminum-silicon alloy material provided by the invention has relatively excellent comprehensive properties such as tensile strength and elongation and relatively low cost, and can replace traditional cast aluminum, deformed aluminum, medium-low grade ductile iron, gray iron, carbon steel, plates and other materials, so that the weight-reducing and light-weight design of parts is realized.

The invention relates to a preparation method of biphase hard nanoparticle reinforced nodular cast iron applied to lost foam casting. The preparation method comprises the following steps: (1) a synchronous chemical preparation process of TiC-TiB2 biphase hard nanoparticles; and (2) preparing the reinforced nodular cast iron containing the double-phase hard nanoparticles by using an evanescent mode casting process. The preparation method has the advantages that the preparation process is simple, casting equipment and the process are not changed, nano-particles are uniformly dispersed and the like, and the mechanical property and the wear resistance of the obtained nano-particle reinforced nodular cast iron are obviously improved; tiC-TiB2 double-phase hard nanoparticles are added into an evanescent mode model, in the casting process, the nanoparticles gradually enter molten iron along with melting of the model, the nucleation rate of a primary structure of nodular cast iron is effectively increased, grains are refined, and the obdurability of a matrix is improved; the nano-particle reinforced nodular cast iron can be widely applied to the fields of automobiles, mining equipment, ships, infrastructure construction and the like.

The invention belongs to the technical field of nodular cast iron preparation, and discloses nodular cast iron, a casting and a preparation method of the nodular cast iron, and the nodular cast iron comprises the following chemical components in percentage by weight: 3.68 to 3.75 percent of C, 2.35 to 2.45 percent of Si, less than or equal to 0.10 percent of Mn, 0.010 to 0.030 percent of P, 0.008 to 0.015 percent of S, less than or equal to 0.010 percent of Ti, 0.0050 to 0.0060 percent of Sb, 0.050 to 0.060 percent of Sn, 0.0065 to 0.0080 percent of La, 0.035 to 0.045 percent of Mg and the balance of Fe and unremovable impurities. The preparation method of the nodular cast iron comprises the following steps that 1, raw materials are smelted to obtain molten iron; 2, slag pulling is conducted on the molten iron, and impurities are removed; 3, the molten iron obtained in the step 2 is poured into an electric furnace, silicon carbide accounting for 0.20-0.30% of the weight of the molten iron is added in the process, and then spheroidizing inoculation treatment is conducted; and 4, pouring is conducted, nodular cast iron is obtained, and stream inoculation treatment is conducted in the pouring process. By limiting the composition and the dosage of the nodular cast iron and controlling the adding time and the dosage of silicon carbide in the preparation process, pearlites in the nodular cast iron can be uniformly distributed, and the number of the pearlites is stably controlled between 35% and 45%.

The invention relates to a nodular cast iron pipe machining cutting device, and relates to the technical field of cast iron pipe production and machining, the nodular cast iron pipe machining cutting device comprises a base, a cutting mechanism for cutting a pipe fitting and a clamping mechanism for fixing and clamping the pipe fitting; the vertical plates are arranged left and right, supporting assemblies for supporting the inner walls of the pipe fittings are fixed to the sides, close to the cutting mechanism, of the vertical plates, and the two supporting assemblies are arranged in a mirror image mode. The supporting assembly comprises a supporting rod and an air bag I; the supporting rods are of telescopic adjusting structures and are fixed to the corresponding vertical plates. The first air bag is of an annular structure and connected to the outer side of the telescopic end of the supporting rod in a sleeving mode, and the inner wall of the pipe fitting is supported through inflation expansion. The technical effects that the interior of the pipe fitting is stably supported during cutting, the quality of a cut pipe opening is improved, the stability during cutting is improved, and the cutting efficiency is improved can be achieved.

The invention belongs to the technical field of nodular cast iron, and discloses low-temperature nodular cast iron, a preparation method and a QT400-18L volute casting. The low-temperature nodular cast iron and the nodular cast iron are obtained through spheroidizing inoculation treatment of a pretreating agent A and a special-effect inoculant B; the pretreating agent A comprises the following components in percentage by weight: 45-50% of Si, 1.0-1.5% of Ca, 9-10% of Ba, 0.8-0.9% of La, 0.8-1.0% of Al, less than or equal to 0.005% of Ti and the balance of Fe, and the granularity of the pretreating agent A is 2-5mm; the special-effect inoculant B comprises the following components in percentage by weight: 58-62% of Si, 0.8-1.0% of Ca, 1.9-2.0% of Bi, 1.0-1.2% of Al, less than or equal to 0.005% of Ti and the balance of Fe, and the granularity of the special-effect inoculant B is 3-8mm; the nodular cast iron comprises the following components in percentage by weight: 3.72 to 3.78 percent of C, 2.40 to 2.50 percent of Si, 0.09 to 0.12 percent of Mn, less than or equal to 0.015 percent of P, 0.005 to 0.010 percent of S, less than or equal to 0.008 percent of Ti, 0.0035 to 0.005 percent of Sb, 0.05 to 0.08 percent of V, 0.008 to 0.010 percent of La, 0.040 to 0.050 percent of Mg and the balance of Fe. According to the low-temperature nodular cast iron, the nodular cast iron with high-low-temperature tensile strength, high percentage elongation after fracture and high-low-temperature impact energy absorption is effectively obtained through comprehensive adjustment of the Si content, the Mn content and the V content in combination with addition of the pretreating agent A and the special-effect inoculant B in nodulizing inoculation treatment under the specific chemical components.

The invention relates to the field of metal material casting, and discloses a production method of green sand as-cast high-plasticity nodular cast iron QT800-5, which comprises the following steps: preparing pig iron, waste steel and foundry returns, and using auxiliary materials such as a silicon carbide pretreating agent, a high-temperature graphitization carburant, a rare earth magnesium silicon iron nodulizing agent, a silicon barium nucleating agent and a silicon strontium nucleating agent to prepare the green sand as-cast high-plasticity nodular cast iron QT800-5. The purity and component stability of molten iron are ensured; in the smelting process, purification and adjustment are carried out through temperature control and segmented addition of auxiliary materials, then spheroidizing is carried out through a pouring method, and the microscopic structure of a casting is optimized through ladle-to-ladle inoculation and stream inoculation; the final casting has excellent mechanical properties including the tensile strength larger than or equal to 800 MPa, the yield strength larger than or equal to 480 MPa, the elongation larger than or equal to 5% and the matrix pearlite content larger than or equal to 80%. The production process disclosed by the invention is simplified, is suitable for large-scale industrial production, and has a wide application prospect in lightweight application requiring high-strength and high-plasticity materials.

The invention relates to casting equipment and a casting method for improving the spheroidization rate of spheroidal graphite cast iron through calipers, and belongs to the technical field of spheroidal graphite cast iron. The casting ladle is provided with a feeding port, and the spheroidizing mechanism is detachably installed at the feeding port and located in the casting ladle. The spheroidizing mechanism comprises an adjusting assembly, a casting pipe and a spheroidizing assembly. The casting pipe is arranged at the feeding port, the spheroidizing assembly is installed on the outer side of the casting pipe and rotationally connected with the casting ladle, and a spheroidizing agent is placed in the spheroidizing assembly; the adjusting assembly is used for adjusting the discharging speed of a spheroidizing agent in the spheroidizing assembly, the spheroidizing agent is dispersed in the same mode as the molten iron to make contact with the molten iron and be spheroidized, the situation that the spheroidizing agent which does not participate in spheroidizing is affected in the molten iron adding process is avoided, the releasing speed of the spheroidizing agent can be adjusted according to the flowing speed of the molten iron, and the spheroidizing efficiency is improved. The spheroidizing content and efficiency of the spheroidizing agent can be controlled, it is guaranteed that enough graphite is spheroidized, and the performance of castings is improved.

The invention belongs to the technical field of polishing devices, and particularly relates to a spherical polishing device for spheroidal graphite casting production, which comprises a workbench, one side of the upper end surface of the workbench is slidably connected with a rack I, the middle part of the upper end of the rack I is rotatably provided with a rotating plate, and the lower end of the rotating plate is fixedly connected with a fixed disc; a sliding groove is formed in the fixing disc in the radial direction, a radial rod is slidably connected to the sliding groove, a polishing brush is fixedly connected to the lower end of the radial rod, and a base is fixedly connected to the middle of the upper end face of the workbench. By means of the rolling type feeding mechanism, a plurality of disorderly stacked spheroidal graphite castings can be longitudinally arranged, then sequentially arranged on the supporting column in a sleeving mode and fixed, automatic feeding of the multiple to-be-polished spheroidal graphite castings is achieved, and the situation that the multiple to-be-polished spheroidal graphite castings are stacked together in a disordered mode is avoided; and clamping structures such as manipulators are difficult to clamp and fix one by one, so that the subsequent polishing work of the spheroidal graphite castings is influenced.

Provided is a high carbon content as-cast high strength and high toughness ductile iron, belonging to the field of ductile iron casting. Carbon content of the ductile iron is ≥4.0%, and the ductile iron contains no or little precious metal strengthening alloy. When molten iron is spheroidized out of a furnace, an inhibitor for controlling the morphology of the ductile iron and a sufficient amount of a spheroidizing agent are added to a spheroidizing bucket. The mechanical properties of ductile iron material in a cast state without rapid cooling casting or heat treatment of a casting can reach or exceed QT700. The inhibitor is a mixture of the spheroidizing agent and weak carbide forming elements. An amount of the inhibitor added should ensure that a small amount remains in the casting after pouring. Ductile iron products can achieve high strength and high toughness in the cast state without heat treatment such as quenching or normalizing, and the production costs thereof are much lower than those of ductile iron products that rely on alloys to improve performance.

The invention relates to the technical field of quenching treatment, in particular to a nodular cast iron isothermal quenching cooling method and an isothermal quenching cooling device.The method comprises the steps that when nodular cast iron of the current batch is subjected to cooling treatment in a cooling stage before isothermal quenching in a salt bath furnace, a thermal image of the surface of the salt bath furnace is collected in real time; acquiring a first characteristic value of each nodular cast iron; obtaining a furnace wall area and a non-furnace wall area in each thermal image; obtaining an average temperature value of each non-furnace-wall area; acquiring a local high-temperature area in each thermal image; acquiring a high-temperature characteristic value of each thermal image; acquiring a second characteristic value of each nodular cast iron; and the optimal rotating speed of the stirring device is obtained when the next nodular cast iron of the nodular cast iron of the current batch is subjected to cooling treatment in the cooling stage before isothermal quenching. The invention aims to improve the isothermal quenching cooling quality of the nodular cast iron by adjusting the rotating speed of the stirring device during the isothermal quenching cooling of the nodular cast iron.

The invention discloses a spheroidal graphite cast iron wear resistance evaluation, regulation and control method based on an electronic work function, and relates to the technical field of surface engineering and performance evaluation.The method comprises the steps that electronic work function data and material characteristic data of the surface of spheroidal graphite cast iron are collected; extracting features of the electronic work function data to obtain electronic work function features; based on the electronic work function characteristics, establishing a mathematical model to analyze the correlation between the electronic work function data and the material characteristic data; and analyzing the relationship between the electronic work function characteristics and the wear resistance, and establishing a comprehensive evaluation model to evaluate the wear resistance of the nodular cast iron. The characterization technology, the complex data analysis method and the multivariate statistical model are combined at the same time, the relation between the electronic structure and the macroscopic performance of the material can be deeply understood, and a comprehensive evaluation model is established to predict the wear resistance of the nodular cast iron; the method guides the design of materials and the optimization of the production process.

The invention discloses a cast iron material suitable for a large-size thin-wall high-strength wind power hub and a preparation method and application of the cast iron material, and belongs to the technical field of materials and casting technologys.By optimizing alloy component design and combining the synergistic effect of trace rare metal elements of barium (Ba), antimony (Sb) and bismuth (Bi) and rare earth elements (RE), the high-strength wind power hub is obtained; and by adding a three-phase SiC / SiO2 / TiC nano-particle reinforced phase, pearlite formation is inhibited, graphite nodules are refined, the spheroidization rate is larger than or equal to 95%, and the ferrite content is larger than or equal to 90%. And by adding a nano-particle reinforced phase and controlling the proportion of alloy elements such as Ni < = 0.8%, the corrosion resistance of the material is further improved. The ductile cast iron material with high spheroidization rate, excellent mechanical property, low-temperature impact resistance and corrosion resistance is prepared by using the low-temperature-resistant and high-strength casting process and the intelligent temperature-controlled and cold-controlled casting process, and the requirements of light weight, high strength, corrosion resistance and high reliability of 18MW-grade offshore wind power hubs are met.