752 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 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 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 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 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 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 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 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.

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 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.

The invention discloses nodular cast iron and a production process, and relates to the technical field of nodular cast iron preparation. The invention discloses a nodular cast iron production process. Carbon steel scrap and recirculated iron are used as main furnace materials for smelting, a spheroidizing agent and a first nucleating agent are added for a spheroidizing reaction, pouring is conducted, stream secondary inoculation is conducted, solidification cooling and heat treatment are conducted, and a casting is formed. The process route of the nodular cast iron production process is different from that of a foreign high-silicon solid solution strengthening process route for improving the elongation rate, pig iron is not adopted, only waste steel and recirculated iron are used as main raw materials, and the prepared nodular cast iron meets the requirements of casting products for high strength and high elongation rate of nodular cast iron at the same time; and no precious alloy is added in the production process, so that the production cost is greatly reduced, and the economic benefit is remarkably improved.

The invention relates to the field of marine pipeline engineering, in particular to a nodular cast iron jacking pipe for internal action type integral trenchless pipeline construction, which comprises a nodular cast iron jacking pipe and a control end, and is characterized in that a birdmouth and an inserting end are integrally formed on two sides of the nodular cast iron jacking pipe; a first pressure sensing end and a second pressure sensing end are arranged on the inner wall of the birdmouth, a sliding material discharging opening is formed in the top of the nodular cast iron jacking pipe and the surface of the nodular cast iron jacking pipe, and a metal mounting strip is mounted on the outer surface of the nodular cast iron jacking pipe in an embedded mode; and a third pressure sensing end and a fourth pressure sensing end are arranged at the two ends of the surface of the metal mounting strip. By monitoring the pressure change of the outer wall of the pipeline and the seepage state of the sliding material in real time, the injection amount of the sliding material is dynamically regulated and controlled to adapt to seawater pressure fluctuation and seabed geological change; and meanwhile, the pipeline breaking risk is calculated through multi-dimensional stress analysis, a construction middle layer is accurately set, and the problem of pipeline continuous laying in the deep sea environment is solved.

The invention relates to the technical field of water conservancy projects, and discloses a two-way water stop cast iron gate with a protection function, comprising: a door-shaped gate frame, which is internally provided with a vertical lifting area; the nodular cast iron gate is movably mounted in the vertical lifting area; the bidirectional self-adaptive sealing system comprises an adjusting cavity which is arranged in the nodular cast iron gate and is through up and down; the connecting rod is fixed to the top of the door-shaped gate frame and extends into the adjusting cavity. The piston assembly can move in the adjusting cavity; when the gate descends, water flow penetrates through the filtering structure to enter the adjusting cavity, the self-weight of the gate is increased, the sealing effect is assisted, the gate can still be kept in a closed state especially under the low-water-pressure or water-free working condition, when the gate ascends, water in the adjusting cavity reversely scours the composite filtering plate, impurities are taken away, and self-cleaning of the filtering system and the bottom sealing strip is achieved; the manual maintenance frequency is reduced, and the device has the advantages of being high in practicability and self-cleaning.

The invention relates to the technical field of roller manufacturing, and particularly discloses a preparation method of a composite cast wear-resistant roller. Two medium-frequency induction furnaces are adopted for smelting roller outer layer metal melt and middle layer and roller core molten iron correspondingly, roller outer layer materials comprise high-speed steel and high-chromium cast iron or high-nickel-chromium-molybdenum cast iron, the middle layer is cast iron, and the roller core is ductile iron. The outer layer and the middle layer of the roller are formed in a centrifugal composite mode, the roller core is formed in a static casting mode, and the three layers of metal are in firm metallurgical bonding. The prepared composite roller is high in hardness and good in obdurability and abrasion resistance, under the same working condition, the abrasion resistance of the roller is improved by 30% or above compared with that of a common centrifugal composite roller, the production cost of rolled metal can be effectively reduced, and good economic and social benefits are achieved.

The invention discloses a nodular cast iron casting casting device, and relates to the technical field of casting, the casting casting device comprises a centrifugal casting mechanism, the centrifugal casting mechanism comprises a mold cylinder and a centrifugal driving assembly, the output end of the centrifugal driving assembly is in transmission connection with the mold cylinder, and the centrifugal driving assembly is used for driving the horizontally arranged mold cylinder to rotate; the material uniformizing mechanism comprises a material uniformizing barrel and a material uniformizing driving assembly, the output end of the material uniformizing driving assembly is in transmission connection with the material uniformizing barrel, the material uniformizing driving assembly is used for driving the material uniformizing barrel to rotate, a plurality of material uniformizing holes are formed in the barrel wall of the material uniformizing barrel, and in the liquid injection state, the material uniformizing barrel is located in the mold barrel and is coaxially arranged with the mold barrel; the rotating direction of the material uniformizing barrel is the same as that of the mold barrel, and the rotating speed of the material uniformizing barrel is higher than that of the mold barrel; the liquid injection mechanism is arranged in the material uniformizing barrel, and the liquid injection mechanism is used for conveying the molten liquid into the material uniformizing barrel; according to the casting device, the metal liquid can be uniformly sprayed, and the wall thickness deviation is reduced.

The invention relates to the technical field of casting of iron castings, in particular to a casting method of a nodular iron casting, which comprises a workbench, a lower die holder is arranged at the top of the workbench, an upper die holder matched with the lower die holder is arranged above the lower die holder, and an air cylinder for pushing the upper die holder to move is arranged at the top of the upper die holder; and the operating mechanism comprises an electric sliding rail frame, the electric sliding rail frame is fixedly connected to the top of the workbench, and an electric sliding block capable of sliding left and right on the outer side of the electric sliding rail frame is arranged on the outer side of the electric sliding rail frame. Before a nodular iron casting is poured, dust and impurities in the inner wall of the upper mold base and the inner wall of the lower mold base can be cleaned at the same time, cleanliness in the mold is guaranteed, a release agent can be evenly sprayed into the mold through the cleaning assembly, the release agent can form a layer of film on the surface of the mold, and the mold is prevented from being damaged. And the product is prevented from being adhered to the mold in the forming process, so that the product can be smoothly demolded.

The invention discloses a nodular cast iron graphite particle distribution detection method and system, and the method comprises the following steps: 1) obtaining an original metallographic image of nodular cast iron graphite particles, and converting the original metallographic image into a grayscale image; 2) performing threshold processing on the grayscale image to generate a binary image; 3) extracting an edge in the binarized image by adopting an edge detection algorithm; 4) carrying out closing operation on the edge to form a closed outline; 5) extracting and screening contours, and removing noise and incomplete contours; 6) calculating the centroid of the screened contour; 7) constructing an empirical distribution function; and 8) evaluating the distribution uniformity of the graphite particles. The system comprises an image acquisition module, an image processing module, a calculation module, an inspection module and an output module. Through the automatic process, the efficiency of quality detection of the nodular cast iron material is improved, the subjectivity and errors of manual detection are reduced, and the method has important significance for controlling the mechanical property and toughness of the nodular cast iron material.

The invention belongs to the field of casting production of castings, and particularly relates to nodular cast iron for high-performance machine tool castings and a preparation method thereof. The nodular cast iron comprises the following chemical components in percentage by mass: 3.10%-3.20% of C, 3.50%-3.60% of Si, 0.2%-0.3% of Mn, 1t of P and the balance of Fe and inevitable impurities. 0.03%, S: lt; the alloy comprises the following components in percentage by weight: 0.015% of Fe, 0.038%-0.052% of Mg, 0.30%-0.40% of Cu, 0.01%-0.02% of Sn, 0.01%-0.02% of Sb, 0.01%-0.02% of rare earth elements, 4.20%-4.40% of CE and the balance of Fe and inevitable impurity elements. The nodular cast iron disclosed by the invention has high strength, high rigidity and good toughness, and meets performance requirements on high-end machine tool castings. The preparation method is simple in process, convenient to operate and suitable for industrial production.

A nodular cast iron jacking pipe outer wall rapid forming production device comprises a chassis, a motor base and a demolding hydraulic cylinder are installed on the chassis, a driving motor is installed on the motor base, a driving gear is arranged at the output end of the driving motor and meshed with the side edge of a mold, and the lower portion of the mold is arranged on the chassis. A vibrator is installed on the outer wall of the mold, the demolding hydraulic cylinder is located in the middle of the upper portion of the chassis, a pipe body positioning disc is installed at the top end of the demolding hydraulic cylinder, a pipe body tray is arranged on the pipe body positioning disc, the side edge of the upper portion of the pipe body tray abuts against the bottom of the cast iron pipe body, and a disc pressing mechanism is arranged above the cast iron pipe body. The device has the advantages that demolding operation can be conducted after pouring is completed, the production efficiency of nodular cast iron jacking pipe outer wall concrete can be greatly improved, continuous production can be achieved only through one set of molds of the same specification, the mold utilization rate is greatly increased, the jacking pipe production efficiency is improved, and the daily output of the same specification depends on the number of pipe body trays.

This invention relates to a vermicular cast iron alloy with high mechanical strength and thermal conductivity requirements to replace the conventional gray and vermicular cast irons and introduces a manufacturing process for high mechanical strength and thermal conductivity vermicular cast iron alloy and internal combustion engine parts produced from said alloy. The alloy includes carbon, manganese, tin, copper, molybdenum, silicon, magnesium, rare earths, chromium, titanium, niobium, vanadium, tungsten, phosphorus, sulfur, aluminum, and nickel. The alloy has a graphite microstructure consisting of up to 70% of vermicular particles and up to 30% of nodular particles in area, with a matrix in area up to 80% pearlitic and up to 20% ferritic, with presence of segregating carbides of up to 1%.

The invention provides a nodular cast iron water grate casting mold with a cooling system and a casting method, and relates to the technical field of mold casting machining. The nodular cast iron water grate casting mold with the cooling system comprises a base, a guide frame is fixed to the base, a top base is fixed to the guide frame, a hydraulic cylinder is fixed to the top base, a hydraulic rod is fixed to the hydraulic cylinder, an upper mold base is fixed to the hydraulic rod, an upper ring is fixed to the outer portion of the upper mold base, and an upper ejector rod is fixed to the upper mold base. A lower die holder is fixed on the base, a lower ring is fixed outside the lower die holder, a lower ejector rod is fixed on the lower die holder, a liquid cooling structure is arranged on the top holder, an outer support is fixed outside the base, sealing structures are arranged on the upper die holder and the lower die holder, and an air cooling structure is arranged on the outer support. According to the nodular cast iron water grate casting mold with the cooling system and the casting method, the upper mold base and the lower mold base can be sealed through the sealing structure, the mold can be cooled through the liquid cooling structure, a casting can be cooled through the air cooling structure, and the casting cooling effect is improved.

The mold comprises a lower box shell, a middle box shell, an upper box shell and a reinforcing top cover, the middle box shell is connected with the lower box shell, the upper box shell is assembled at the upper end of the middle box shell, the reinforcing top cover is assembled at the upper end of the upper box shell, and the reinforcing top cover is connected with the middle box shell. A machining groove is formed in the top of the reinforcing top cover, the left side and the right side of the machining groove communicate with a sand-coated pouring cup and an exhaust channel correspondingly, the exhaust end of the exhaust channel communicates with waste gas purification equipment, waste gas generated in the casting process is guided into the waste gas purification equipment through the exhaust channel, and the waste gas can be filtered and purified. According to the mold for casting the ductile iron support and the casting process, natural discharge of gas in the pouring process is promoted, and the situation that the quality of a casting is affected by gas retention is avoided; the chemical components of the casting are controlled, and the pouring temperature is combined, so that the uniformity and mechanical property of the ductile iron structure are ensured, and the comprehensive quality of the casting is improved.

The present invention discloses a method for evaluating and regulating the wear resistance of ductile iron based on the electronic work function, which relates to the technical fields of surface engineering and performance evaluation. The method includes collecting the electronic work function data and material characteristic data on the surface of ductile iron; extracting the characteristics of the electronic work function data to obtain the electronic work function characteristics; establishing a mathematical model based on the electronic work function characteristics to analyze the correlation between the electronic work function data and the material characteristic data; 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 ductile iron. The present invention combines characterization techniques, complex data analysis methods and multivariate statistical models at the same time. It can not only deeply understand the connection between the electronic structure and macroscopic properties of materials, but also establish a comprehensive evaluation model to predict the wear resistance of ductile iron; this method guides the design of materials and the optimization of the production process.

The invention relates to the technical field of nodular cast iron and an annealing method thereof, and discloses an annealing method for improving elastic modulus and strength of nodular cast iron and application, the annealing method comprises the following steps: first-stage annealing and high-temperature decomposition: heating to 880-980 DEG C along with a furnace, and preserving heat for 15-36 hours; second-stage annealing and low-temperature graphitization: cooling to 650-860 DEG C, preserving heat for 3-5 hours, and then quickly discharging from the furnace for air cooling; and performing surface treatment: performing shot blasting to remove oxide skin to obtain the nodular cast iron material. According to the scheme, the nodular cast iron material is prepared from the following raw materials in percentage by mass: 1.8 to 2.3 percent of C, 1.3 to 2.2 percent of Si, 0.3 to 0.7 percent of Mn, 0.002 to 0.005 percent of Bi, 0.002 to 0.01 percent of Sb, less than 0.06 percent of P, less than 0.2 percent of S and the balance of Fe. Compared with the prior art that two-stage annealing (such as furnace cooling to 595-635 DEG C after 900-950 DEG C treatment and heat preservation) needs to be matched with special components such as high rare earth and high phosphorus, the steps are complex and the cost is high, the phosphorus content and the rare earth content of the material in the scheme are low, the elastic modulus and the tensile strength of the nodular cast iron can be effectively improved by adding a proper amount of nodulizing agent, the production process is simplified, and the production cost is reduced. And the cost can be reduced.

The invention relates to the technical field of casting mold cooling capacity regulation and control and material-process collaborative optimization, in particular to a V-method precise resin sand mold casting process method suitable for gray iron or ductile iron. The invention relates to a V-method precise resin sand mold casting process suitable for gray iron or ductile iron, which comprises the following steps: firstly, preparing gradient function modified resin sand, mixing spherical reclaimed sand with various materials such as novolac epoxy resin, and carrying out multi-step stirring and surface modification treatment; an intelligent temperature control sand box is prepared, and then the steps of forming negative pressure curing, composite inoculation treatment, vacuum differential pressure pouring, intelligent cooling control and the like are carried out; in the process, special materials and structures such as a core-shell curing agent, a double-layer film and a core-spun yarn are used, and precise process control is achieved. According to the process, through material innovation and process optimization, the sand mold strength and stability are improved, and casting defects are reduced; the casting quality is improved through the precise temperature control and pouring mode, and the mechanical property is enhanced through composite inoculation; the method is environment-friendly and economical, reduces the cost, improves the yield and has a wide application prospect.

The invention discloses nodular cast iron and a heat treatment method and application, and belongs to the technical field of nodular cast iron. The nodular cast iron is prepared from, by mass, 3.4%-3.8% of C, 2.0%-3.0% of Si, smaller than or equal to 0.6% of Mn, 0.03%-0.06% of Mg, smaller than or equal to 0.15% of Mo, larger than or equal to 0.2% and smaller than or equal to 1% of Cu and Ni, smaller than or equal to 0.02% of rare earth Re and the balance Fe and inevitable impurities. The nodular cast iron is high in pearlite content and smaller in lamellar spacing, the fatigue strength, the tensile strength and the yield strength can be remarkably improved, meanwhile, the nodular cast iron has the advantage of being low in cost, and a planet carrier prepared from the nodular cast iron material can remarkably improve the service reliability of a wind power gear box and reduce the full-life-cycle maintenance cost.