379 results about "Casting defect" patented technology

The invention relates to the technical field of alloy pouring processes, in particular to a magnesium alloy heterogeneous flow overall coordination pouring process which comprises the steps of conducting pouring numerical simulation through simulation software, optimizing pouring design and determining a composite flow guide structure, a mold temperature control scheme and an alloy component regulation and control strategy. Magnesium alloy smelting and refining are conducted; preheating the mold by using an intelligent temperature control system; during the period, the intelligent temperature control system monitors and adjusts the temperature of the mold, and the online alloy adding system and the impurity adsorption filtering device keep the components of the melt uniform and pure; and after pouring is completed, controlling the mold temperature according to a preset cooling curve to slowly and uniformly solidify the melt. The design of the bionic branch-shaped flow dividing structure, the dynamic adjustable flow guide plate and the like reduces casting defects, and the casting forming quality is improved. And on-line alloy adding and impurity adsorption filtering ensure that melt components are stable, and the casting performance is improved.

The invention relates to the technical field of metal ultrasonic detection, and discloses a method for performing nondestructive flaw detection on a casting by using ultrasonic waves and a flaw detection system.The method comprises the following steps that rapid modeling and acoustic reference calibration are performed on equipment and a workpiece, and a unified coordinate system, a sound velocity delay reference and an optimal sound beam path are obtained; acquiring and caching multi-view ultrasonic echoes in real time to obtain a high-integrity original data stream; implementing adaptive noise diffusion based on the data stream, and constructing a diffusion data stack matched with scattering characteristics; performing scattering compensation inverse diffusion and super-resolution fusion on the diffusion stack to obtain a high-resolution purified echo image; performing closed-loop regulation and control on image quality indexes, and optimizing scanning parameters in real time; and combining the optimized image and scanning parameters, and adopting a segmentation network and online increment fine tuning to realize defect identification and automatic grading. The system has high resolution, real-time performance and self-adaptive closed-loop control, and the reliability and the accuracy of casting defect detection are remarkably improved.

The invention discloses an intelligent scheduling and collaborative operation system and method based on aluminum alloy part manufacturing and machining, and relates to the technical field of aluminum alloy part manufacturing and machining. The system comprises the following components: a data acquisition and transmission module, which is used for arranging a plurality of sensors in each link of aluminum alloy part casting to acquire material performance and processing parameter data, encrypting and transmitting the data to a processing center, and carrying out data cleaning, format conversion and normalization preprocessing; through cooperative operation of machine learning and a fluid dynamics simulation technology, real-time, accurate and intelligent regulation and control are carried out on the whole aluminum alloy casting process, the machine learning analysis module can monitor material performance in real time and pre-judge the future change trend of the material performance, the fluid dynamics simulation module can deeply analyze casting defect generation roots, and the casting defect generation quality is improved. And the defects of air holes and shrinkage porosity can be prevented in advance, stable product performance is ensured, and the strict requirements of automobile parts and the like for high-quality aluminum alloy products are met.

The invention discloses an electric arc additive manufacturing method universal for ZM series magnesium alloys, which comprises the following steps of: 1, carrying out high-precision digital modeling, carrying out refined model subdivision according to geometrical characteristics of a workpiece, and carrying out targeted path planning according to a subdivision result; 2, preheating the magnesium alloy substrate, and introducing inert protective gas; 3, fixing the ZM-series magnesium alloy coiled wire in wire feeding equipment; fourthly, electric arc additive manufacturing parameters are input; 5, electric arc additive manufacturing; and sixthly, air cooling is conducted till the room temperature is reached, and the ZM-series magnesium alloy workpiece is obtained. The novel ZM magnesium alloy preparation method, namely the electric arc additive manufacturing method universal for the ZM magnesium alloy, is provided by considering the defects that the ZM magnesium alloy usually has many casting defects, low strength and the like, and according to the method, a magnesium alloy base plate is treated, and electric arc additive manufacturing parameters are controlled; the ZM-series magnesium alloy is prevented from common casting defects such as looseness and shrinkage cavities, the microstructure is fine and uniform, and the good mechanical property is achieved.

The invention discloses a conformal cooling device for die-casting die temperature intelligent control and a regulation and control method. The conformal cooling device comprises a die body, an embedded conformal cooling runner network, a multi-mode temperature sensing array, a partition flow regulation and control valve group, a central cooperative controller and a cooling medium circulation supply unit. Through the combination of shape follow-up runner design and partition dynamic regulation and control, a cooling blind area is effectively eliminated, the surface temperature uniformity of a cavity is remarkably improved, and the cooling time of a hot spot area is shortened, so that the defects of shrinkage cavities, hot cracks and the like are inhibited, and the defect rate of castings is reduced. And under the cooperation of multi-mode sensing and intelligent control, the system response is accelerated, the energy consumption is reduced, the die-casting rhythm is shortened, and the synchronous optimization of the production efficiency and the energy utilization efficiency is realized.

The invention discloses a casting defect infiltration type detection system, and relates to the technical field of casting defect detection. A permeation control mechanism is arranged on a permeation station, the permeation control mechanism comprises a walking power assembly arranged on a guide rail in a sliding mode, two sets of steering guide grooves are formed in the inner wall of a steering control cylinder in an annular array mode, a pipe body casting part is clamped and fixed between rotary clamping parts, and a steering guide part is arranged between the two steering guide grooves in a sliding mode; the steering control cylinder is sleeved with the casting clamping assembly, the steering guide piece slides along the steering guide groove to achieve 90-degree rotation of the pipe casting, and a penetrant output part is arranged on the inner side of the penetrant storage box and used for conveying a penetrant in the penetrant storage box into the pipe casting. The penetration station, the washing station, the drying station, the spraying station and the detection station are sequentially arranged in the direction of the guide rail, and the penetration control mechanism is arranged on the penetration station, so that the defects of the inner wall of the pipe body casting part can be automatically detected.

The invention discloses a vacuum negative pressure vibration assisted precision casting forming method. The method comprises the steps of model preparation, sand box and dry sand pretreatment, layered vibration sand filling, film covering vacuumizing, molten metal smelting and purification treatment, negative pressure vibration pouring, pressure maintaining solidification, segmented temperature control and pressure relief box opening and multi-stage cleaning aftertreatment. The core of the method is that mechanical vibration and a vacuum negative pressure technology are deeply coordinated and penetrate through the whole process of modeling, pouring and solidification, and meanwhile, a series of fine control means such as dry sand accurate pretreatment, molten metal rotary blowing degassing and instantaneous inoculation, stepped negative pressure control, temperature-related segmented pressure relief and two-stage shot blasting cleaning are matched; through dynamic cooperation of vibration and negative pressure, the sand mold compaction uniformity, the molten metal mold filling capacity and the solidification feeding effect are remarkably improved, the casting defects of air holes, shrinkage porosity, insufficient pouring and the like are effectively reduced, and the internal density, the size precision and the surface quality of a casting can be remarkably improved.

The invention relates to the technical field of low-pressure casting, in particular to a low-pressure casting device for an aluminum alloy component, which comprises a base, a rotary table rotationally arranged on the base, two holding furnaces arranged on the rotary table, a lifting table arranged on the base and positioned above the holding furnaces, a liquid lifting pipe arranged at the bottom of the lifting table, and a rotating plate rotationally connected to the inner bottom of each holding furnace, two first gears are rotatably arranged between the bottom of the rotary table and the base, the two first gears and the two rotary plates are coaxially arranged respectively, a rotary rod is rotatably arranged on one side of the base, a second gear is fixedly connected to the lower end of the rotary rod, and the second gear is fixedly connected to the other side of the rotary rod. The second gear is in meshing transmission with the first gear. The scraping rods are arranged in the heat preservation furnace to automatically scrape the inner wall and the outer wall of the liquid rising pipe, solid particles formed by solidification of residual molten metal are effectively removed, the situation that the solid particles enter a cavity to cause casting defects is avoided, and the internal quality of aluminum alloy components is guaranteed.

The invention discloses a method for preparing a high-strength heat-resistant die-casting Mg-Gd-Zr alloy by regulating physical parameters, and relates to the technical field of alloy die-casting processing. According to the method for researching and developing the die-casting high-strength heat-resistant Mg-Gd-Zr alloy by adjusting the Gd / Y ratio, the Zn / RE ratio and the Al content in the Mg-Gd-Zr alloy, the feasibility of the scheme is preliminarily verified through low-cost gravity casting starting from alloy component screening, a large number of elements beneficial for improving the fluidity of the alloy are screened in combination with thermodynamic calculation and dynamic calculation, and the high-strength heat-resistant Mg-Gd-Zr alloy is obtained. On the basis of keeping high strength, the die casting defects are reduced, the elongation of the alloy is improved, finally, the high-strength heat-resistant Mg-Gd-Zr alloy subjected to high-pressure die casting is successfully prepared, and the technology starts from the alloy, improves the alloy flowability, reduces the defects brought in the die casting process and improves the alloy performance.

The invention belongs to the technical field of vacuum centrifugal casting and vacuum induction melting, and particularly relates to a complex thin-wall casting vacuum induction remelting pouring temperature gradient control device and method, and the device comprises a calculation system, a temperature measurement mechanism, a rapid induction remelting mechanism and a bottom pouring crucible; the calculation system is used for achieving simulation calculation of rapid induction remelting and bottom pouring of the alloy ingot, and the temperature measuring mechanism outputting target remelting characteristic parameters is used for measuring temperature changes and temperature gradient distribution of the top, the middle and the bottom of the alloy ingot in the remelting process in real time. The rapid induction remelting mechanism is used for melting the alloy ingots and achieving the melting sequence of the alloy ingots from top to bottom and from outside to inside. By means of the high-temperature alloy remelting device, the problem that in the high-temperature alloy remelting process, due to the fact that the temperature gradient is disordered, alloy is completely melted or part of alloy liquid flows out from the bottom firstly is effectively solved, and casting defects are reduced.

The invention relates to the field of single-crystal high-temperature alloy directional solidification casting defect prediction, in particular to a single-crystal blade freckle defect prediction method based on a large-module casting technology, which comprises the following specific steps of: establishing a 1 / 8 model of a large-module casting system by using modeling software; thermophysical parameters of the single-crystal high-temperature alloy are calculated, and the heat exchange coefficient among the casting, the mold shell and the water cooling disc in the numerical simulation process is determined in combination with related literatures; carrying out directional solidification numerical simulation, analyzing the change of the morphology of the pasty area in the solidification process, and counting the inclination angle of the pasty area of each part of the casting; establishing a Rayleigh number prediction formula, and comparing and analyzing a freckle high inclination area of a simulation result and a freckle occurrence position of an experiment result; and improving a Rayleigh number prediction formula by combining the inclination angle of the pasty area and the transverse temperature gradient value to obtain a Rayleigh number prediction result with more accurate prediction. According to the method, the position and tendency of freckles possibly appearing on the casting are predicted in advance by means of numerical simulation, and the freckle defect is avoided.

The invention discloses an adjustable concrete vibrating device, which belongs to the technical field of building construction appliances, and comprises a vibrating rod connected with an output line, a winding and unwinding assembly and an output assembly, the take-up and pay-off assembly is connected with the output line and used for adjusting the position of the vibrating rod up and down; the output assembly is connected with the retracting and releasing assembly, and the vibrating frequency of the vibrating rod is controlled through the rotating speed. The folding and unfolding assembly has a high-position state and a low-position state; when the retracting and releasing assembly is in a high-position state, the vibrating rod vibrates at a first frequency; and when the retracting and releasing assembly is in the low-position state, the vibrating rod vibrates at the second frequency. According to the method, high-frequency vibration is carried out in a high-position state to break and remove initial casting defects, bubbles are discharged to the maximum extent through high-frequency vibration, holes are prevented from being formed after hardening, low-frequency vibration is carried out in a low-position state to restrain segregation and layering, a vibration rod makes contact with a formwork or bottom-layer steel bars when sinking to the bottom, and the situation that aggregate collision energy can be amplified through high-frequency vibration is avoided.

The application discloses a hollow noise-reducing light-weight hub and a hub mold, which comprise a rim and spokes, the rim is provided with an outer window and a gas port, a hollow cavity is arranged in the rim, the hollow cavity is provided with a first aperture at the outer window and a second aperture at the gas port, and a third aperture is arranged on the back side of the spoke; the above structure makes the wall thickness of the rim uniform, casting defects are not easy to occur, noise can be reduced, the hub can be lightened, and the weight of the hub is lighter than that of an existing hub; the mold comprises a lower mold, a sand core and an upper mold; the lower mold is provided with a boss portion and a groove portion, the boss portion is provided with a first recess and a second recess; the main body of the sand core is provided with a first convex portion and a second convex portion; the upper mold is press-fitted on the sand core, the bottom of the upper mold is provided with an arc pressing portion, the arc pressing portion is arranged above the groove portion, the arc pressing portion is in contact with the top surface of the boss portion, the lower mold, the sand core and the upper mold are assembled and fixed, and product casting is completed.

The invention discloses an aluminum alloy casting defect identification method and system based on image analysis, and relates to the technical field of image analysis. According to the aluminum alloy casting defect identification method based on image analysis, multi-modal image data of a to-be-detected aluminum alloy casting is obtained, registration processing is carried out, and the to-be-detected aluminum alloy casting is divided into a plurality of analysis areas; based on the unified coordinate system, respectively acquiring corresponding areas of the visible light, the thermal image and the X-ray transillumination image in each analysis area, and extracting visible light, thermal image and X-ray transillumination characteristics of the corresponding analysis area; analyzing the corresponding surface texture, temperature gradient and transillumination projection comprehensive index; the method comprises the following steps: performing uniform registration and regionalization analysis on visible light, thermal images and X-ray transillumination images, performing matching analysis on the visible light, the thermal images and the X-ray transillumination images and preset corresponding defect intervals, and judging that an analysis area is a defect area when any index is in the corresponding defect interval. And the limitation that traditional single-mode detection can only identify specific types of defects is broken through.

The invention provides a high-temperature alloy in-situ heating anti-gravity casting device and method. The device comprises an upper tank body, a lower tank body and a middle partition plate. The shell is fixed on the middle partition plate and is connected with the riser tube; the power source is positioned at the top of the upper tank body; the transmission assemblies are symmetrically fixed on two sides of the inner wall of the upper tank body; the mold chamber roasting furnace is fixed on the transmission assembly; the horizontal driving devices are symmetrically distributed on the two sides in the lower tank body; the riser tube heater is of a split structure surrounding the riser tube, and the horizontal driving device drives the riser tube heater to be closed; the auxiliary crucible is located in the lower tank body and used for heating and smelting the alloy base metal into molten metal; the auxiliary crucible is connected with a mechanical rotating device, and the mechanical rotating device is used for inclining the auxiliary crucible and pouring molten metal in the auxiliary crucible into the main crucible; the main crucible is used for heating molten metal placed in the main crucible. The heat loss of the shell and the riser tube in the roasting and pouring process can be reduced, the defects of the casting are reduced, and the performance of the casting is improved.

The invention relates to the technical field of magnesium alloys, in particular to a low-density, high-modulus and ultrahigh-strength magnesium-based composite material and a preparation method thereof.The preparation method comprises the steps that SiC reinforcement particles are pretreated; the raw materials are proportioned according to the mass percent of the components of the magnesium alloy; melting pure magnesium, sequentially adding alloy elements, uniformly stirring, cooling to a semi-solid temperature interval, adding the pretreated SiC reinforcement particles, and casting in a preheating mold to solidify, so as to obtain a magnesium-based composite material cast ingot; the cast ingot is sequentially subjected to solution treatment and extrusion forming; carrying out secondary solution treatment on the magnesium-based composite material bar subjected to extrusion forming; and performing rotary swaging deformation and intermediate annealing treatment on the magnesium-based composite material bar subjected to secondary solution treatment to obtain the ultrahigh-strength magnesium-based composite material. Therefore, the problems that in the prior art, magnesium alloy is insufficient in strength and modulus, a magnesium-based composite material easily generates casting defects and is difficult to deform at room temperature, and the performance of the material is weakened due to grain growth during high-temperature deformation are solved.

The invention discloses a casting defect diagnosis and closed-loop control system and method based on causal anti-fact and multi-agent arbitration. The system collects multi-source data such as temperature, flow, cooling, vision and the like, learns a causal structure, establishes an agent model and solves an adjustment scheme which enables the defect probability to be remarkably reduced in a security domain; performing evidence verification on the suggestions through verifiable generation and a knowledge graph, fusing vision, process, metallurgy and simulation agent arbitration, executing in an edge-cloud double ring, and triggering security rollback abnormally; and when the uncertainty is increased, active learning and incremental updating are implemented. According to the scheme, the defects of shrinkage cavities, air holes and the like can be remarkably reduced, the first-pass yield is improved, and the method is suitable for aluminum alloy sand molds, metal molds and low-pressure casting production lines.

A diaphragm chamber structure of a diaphragm pump belongs to the technical field of diaphragm pumps, and particularly relates to improvement of the diaphragm chamber structure of the diaphragm pump. The diaphragm chamber comprises a diaphragm chamber cover, a rubber diaphragm and a diaphragm cavity, and is characterized in that a cavity is formed in one side of the diaphragm chamber cover, and a pressing part is arranged on the outer circumference of the cavity; a channel is formed in the other side of the diaphragm chamber cover; an inlet and an outlet are respectively formed in two ends of the channel; the cavity is communicated with the channel; a pressing groove corresponding to the pressing part is formed in the diaphragm cavity; and the edge of the rubber diaphragm is clamped and fixed through the mutual matching of the pressing part and the pressing groove. The production cost and the maintenance cost are reduced, the structure is simple, and casting defects in the casting process are reduced.

The invention belongs to the field of part manufacturing, and particularly relates to a molten metal purification method for sand mold casting, which comprises the following steps: S1, arranging a steel barrel piece between a pouring ladle and a casting mold for soft sealing, mounting a pressure-bearing pipeline on the steel barrel piece, and forming an angle of 45 degrees between an outlet of the pipeline and a vertical axis; s2, argon is introduced into the pressure-bearing pipeline 5 seconds before pouring, the pressure of the argon is 0.1-0.3 MPa, and argon introduction is stopped immediately when pouring is stopped; and S3, in the cooling process of the molten metal in the casting mold cavity, argon bubbles float upwards to bring inclusions to a top slag collecting groove, and a slag collecting groove is removed during sand cleaning and cutting. According to the steel barrel piece, contact between the atmosphere and molten metal is isolated, and oxide inclusion is effectively prevented; and meanwhile, argon is blown in in the pouring process to form bubbles and enter a casting mold cavity, and casting defects can be effectively reduced according to the principle that the bubbles float upwards to take away inclusions.

The invention provides a casting defect detection and identification method and device, equipment and a storage medium, and belongs to the technical field of image data processing. The method comprises the following steps: acquiring a casting image and casting information of a target casting, matching the target casting with a plurality of historical castings according to the casting information, and determining a plurality of reference castings from the plurality of historical castings; each reference casting is divided into a plurality of detection areas, the number of the detection areas of the reference castings is the same, and the positions of the detection areas are corresponding; determining a plurality of to-be-detected areas of the target casting and a detection sequence of the plurality of to-be-detected areas according to the defect frequency of each detection area of each reference casting; sequentially extracting image feature parameters of the to-be-detected areas from the casting image of the target casting according to the detection sequence of the to-be-detected areas of the target casting; and determining defect information of the target casting according to the image feature parameters of the plurality of to-be-detected areas. The casting defect detection efficiency can be effectively improved.

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 provides a water pump shell casting optimization method based on reinforcement learning. The method comprises the steps of 1, establishing a casting numerical simulation model of a water pump shell; 2, casting process optimization variables are determined, and a data set of process parameters and corresponding casting defect volumes is obtained through orthogonal test design; 3, based on the data set, training a neural network as an agent model to establish a mapping relation from process parameters to casting defect volumes; 4, based on a near-end strategy optimization (PPO) algorithm, taking the proxy model as an environment, carrying out strategy training and optimization solution, and outputting an optimal process parameter combination with the minimum defect volume; according to the method, the forming quality of the complex pump shell can be remarkably improved, casting defects are reduced, meanwhile, the optimal process can be automatically and efficiently found, the development cost is reduced, and the production efficiency is improved.

The invention belongs to the field of repair of high-temperature alloy hot-end components, and particularly relates to a high-strength fusion welding repair method for a difficult-to-weld gas turbine hot-end component. The method comprises the following steps: (1) removing defects of the hot end component of the gas turbine; (2) degreasing the repairing area; (3) carrying out fusion welding repair on the defects by adopting a body welding wire; (4) a surfacing sheath is prepared on the outer surface of the repaired area through solution-strengthened nickel-based alloy welding filler; (5) carrying out hot isostatic pressing treatment on the hot end component; (6) machining and coping a repair area of the hot end component; (7) carrying out nondestructive flaw detection on a hot end component repair area; (8) carrying out standard heat treatment on the hot-end component; and (9) carrying out nondestructive inspection on the hot-end component. The method is used for fusion welding repair of casting defects of the high-temperature alloy hot-end component with high Al + Ti content and difficult to weld and service damage generated after service of the blade, and crack-free high-strength fusion welding repair of the gas turbine hot-end component with poor weldability can be achieved.

The invention discloses metal casting equipment for dumbbell casting production and processing, and relates to the technical field of metal casting equipment. Comprising a fixing plate, the bottom of the fixing plate is rotatably connected with multiple rollers, the multiple rollers are evenly distributed at the corners of the bottom of the fixing plate, the top of the fixing plate is fixedly connected with a middle plate, the top of the middle plate is fixedly connected with a top plate, the top of the top plate is provided with a square hole, and the interior of the square hole is fixedly connected with a fixing rod; the outer side of the fixing rod is slidably connected with a clamping piece. According to the metal casting equipment for dumbbell casting production and machining, a mold in the middle is clamped and fixed through the multiple clamping pieces, uniform clamping force can be provided, the mold can be kept at the accurate position and posture in the casting process, displacement or shaking caused by external force is avoided, and the production efficiency is improved. Therefore, the dimensional accuracy and the shape accuracy of the casting can be ensured, and casting defects caused by mold deviation are reduced.

In order to improve the metallurgical quality of a thin-wall casting in the investment casting process, the invention provides a novel control method based on machine learning and a sequential solidification principle. The method comprises the steps that firstly, geometric structure parameters related to the solidification process are calculated on discretization representation of a casting model, and the geometric structure parameters comprise the distance from a local position to a casting head, the geometric modulus and the mold shell thickness; secondly, in combination with a numerical simulation result, a random forest algorithm is used for establishing a mapping model of geometric structure parameters and solidification time of the casting, and R2 on a verification set is 0.9974; based on the model, the gradient of a solidification curve on a geodesic path is quantitatively adjusted in combination with measures of local formwork thickness reduction and heat preservation cotton coating, and sequential solidification is achieved. And after optimization, the total shrinkage porosity volume of the casting is reduced to 24.78 mm < 3 > from 71.69 mm < 3 >, and is reduced by 65%. The effectiveness of the method is further verified through a pouring experiment, an efficient and quantitative solution is provided for shrinkage porosity control of the thin-wall complex casting, and a new thought is provided for intelligent control over investment casting defects.

The application discloses alloy casting defect detection equipment with intelligent marking function and relates to the technical field of detection equipment. The defect detection equipment comprises a defect sensing system, a marking mechanism, a positioning mechanism, a clamping mechanism and a conveying mechanism. The defect sensing system and the positioning mechanism are fastenedly connected. The marking mechanism and the defect sensing system are fastenedly connected. The positioning mechanism and the conveying mechanism are fastenedly connected. The clamping mechanism and the conveying mechanism are fastenedly connected. The defect sensing system is used for carrying out defect scanning on the surface and the interior of a casting in an ultrasonic wave or electric conductivity mode. The marking mechanism performs coating and solidification color marking operation on a defect area. The clamping mechanism clamps or releases a detected casting, and cooperates to realize multi-angle detection requirement. The detection precision and efficiency are improved, and the realization of defect identification, positioning and tracking marking is ensured.

This application provides a release agent for liquid die forging and a preparation method thereof, comprising the following components in percentage by weight: inorganic powder: 6.4%-19.7%; organic lubricant: 1.7%-6.7%; water: 73.6%-90%. This release agent can effectively improve the fluidity of liquid metal, reduce casting defects, and increase the yield rate of castings during liquid die forging, without affecting subsequent reprocessing. Furthermore, the release agent is environmentally friendly, low-cost, and simple to prepare.

A method for reducing carbon-based emissions and / or carbon-based casting defects during molding material cycles comprising two or more cycles of molding material containing smectite clay is described.

The invention discloses an impeller shell for precisely casting a large-diameter narrow-air-outlet impeller and a shell manufacturing method, and belongs to the technical field of casting. Comprising the following steps: 1) manufacturing a wax mold, assembling a tree and drying; 2) preparing zirconium powder slurry for a first layer; (3) a second layer is sealed after zirconium powder slurry placed for 20-25 h is air-dried; (4) a sand inclusion layer is prepared, specifically, the zirconium powder slurry, zircon sand and mullite sand which are placed for 20-25 h are evenly mixed to prepare mud, air outlets in the periphery of an impeller and holes in the bottom of the impeller are plugged with the mud, and after drying, the mullite sand is poured from the top of the impeller; 5) airing the third layer and the fourth layer by using mullite powder slurry; (6) mullite powder slurry is used for the fifth layer and the sixth layer, a shell cleaning agent is added, and air drying is conducted; (7) sealing the sixth layer to obtain a second sealing layer, and air-drying to obtain the precision casting large-diameter narrow-air-outlet impeller shell. According to the precision casting large-diameter narrow-air-outlet impeller shell, a double-layer sand inclusion process is adopted, the strength is improved, the casting yield is increased, and the casting defects of steel leakage, slag inclusion and insufficient pouring caused by insufficient strength of the shell or existence of gravel clusters and air holes in the shell are overcome.

This invention discloses a high-fluidity, low-casting-defect, and high-strength-toughness Al-Zn alloy and its preparation method, relating to the field of high-performance aluminum alloy materials in aerospace and transportation. The high-fluidity, low-casting-defect, and high-strength-toughness Al-Zn alloy, by mass percentage, comprises the following components: Zn: 5.3-7.3%, Mg: 2.4-3.3%, Cu: 1.4-2.0%, Ni: 0.3-1.3%, Ti: 0.05-0.5%, Zr: 0.03-0.3%, Mn: 0.01-0.2%, Si: ≤0.07%, with Ti and Zr added at a mass ratio of 1-1.5:1. The content of any single impurity is ≤0.03%, and the total impurity content is ≤0.1%, with the balance being aluminum and non-removable impurities. By controlling the content of the main alloying elements and microalloying, the fluidity of the alloy can be improved and casting defects reduced. High-strength and high-toughness alloys can be obtained through heat treatment. The invented alloy has an average spiral flow channel length of ≥700mm, tensile strength of ≥710MPa, yield strength of ≥630MPa, and elongation of ≥8%.