160 results about "Casting defect" patented technology

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 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 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 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 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%.

The invention discloses a CMT electric arc welding method for defect repair welding of a ZL114A aluminum alloy casting, and belongs to the technical field of defect repair of aluminum alloy castings. The method aims at solving the problems that an existing repair welding method for the ZL114A cast aluminum alloy is high in heat input, large in deformation and low in repair efficiency. The method comprises the following steps: firstly, aiming at defects of different sizes, machining the defects into regular spherical-crown-shaped grooves of different sizes by utilizing a cold machining method; an electric steel wire brush is used for polishing the inner wall of the groove and base metal around the groove, and surface stains and oxide skin are removed; the casting is placed on a welding workbench; robot CMT welding equipment is adopted for repair welding; and writing a welding gun repairing path on the robot demonstrator. And repair welding is carried out according to the following principles: repair welding is carried out by utilizing an Al-Si welding characteristic curve, a repair welding piece is preheated to 250-350 DEG C, shielding gas is started, and automatic repair is started according to the planned path, the wire feeding speed and the welding speed. By means of the method, high-quality repair welding seams without pores and cracks can be obtained.

This invention discloses a method and apparatus for preparing metal ingots based on melt flow-limited stacking casting and rapid cooling forming, relating to the field of metal forming technology. This method is based on continuous or intermittent advancement of melt flow-limited bottom casting, layer-by-layer reciprocating stacking, and layer-by-layer relay rapid cooling forming. It can achieve continuous rapid cooling forming of the molten metal, refining grains, and by limiting atomic diffusion, achieve layer-by-layer freezing-type rapid solidification forming with uniform atomic distribution in the molten metal, reducing component segregation. It can also simultaneously achieve the relay upward movement or reduction of casting defects such as shrinkage cavities and porosity layer by layer. The flow-limiting guide nozzle is equipped with a liquid outlet and a parallel and similarly shaped anti-oxidation coolant spray nozzle, located at the bottom of a crucible with a filter to reduce inclusions. This invention can simultaneously and rapidly reduce and coordinately control defects such as coarse grains, shrinkage cavities, porosity, component segregation, and inclusions during the solidification of the molten metal in a short process, achieving short-process, high-quality manufacturing of metal ingots, especially large metal ingots (including amorphous ingots).

The invention relates to the technical field of vane pumps, and provides a shield motor nuclear main pump hydraulic model and a shield motor nuclear main pump. The shielding motor nuclear main pump hydraulic model comprises an impeller, wherein blades of the impeller are blades of a line element three-dimensional structure; the guide vane is matched with the impeller, and blades of the guide vane are blades of a linear element three-dimensional structure; the pump shell is matched with the guide vane; the appearance of the line element three-dimensional structure blade is determined through two sets of curve elements located on the front cover plate and the rear cover plate, and the curve elements comprise a front edge line, a tail edge line, a pressure surface line and a suction surface line. According to the line element three-dimensional structure blade, a front edge line, a tail edge line, a pressure surface line and a suction surface line of a front cover plate and a rear cover plate are generated on the basis of parameterized meridian curve, mean camber line angle distribution and thickness distribution, and a continuous curved surface is constructed through a lofting method, a sweeping method or a grid method. The linear element three-dimensional structure blade can be integrally milled, so that the material utilization rate, the machining efficiency and the machining quality are improved, and the casting defects are overcome.

The utility model relates to the technical field of multi-stage pumps, in particular to a single-flow-channel type inner shell structure applied to a hydrogenation feeding pump and an ammonium carbamate pump in the petrochemical industry. One end of a long transition flow channel suction chamber is connected with a short transition flow channel at the tail of a pump driving end, and the other end of the long transition flow channel suction chamber is connected with one end of a long transition flow channel; the other end of the long transition runner is connected with the first short transition runner at the non-driving end of the pump; and the first short transition runner at the non-driving end of the pump is connected with the delivery chamber to jointly form an inner shell runner. The short transition flow channels are arranged on the single side of the driving end or the non-driving end of the pump in a staggered mode step by step. According to the technical scheme, the problems that the manufacturing difficulty and cost of a grinding tool are increased due to a double-flow-channel structure in the prior art are solved; the small runner size is easy to generate casting defects, and the yield is low; and the pump efficiency is low.

This invention relates to the field of casting technology, and more particularly to an efficient casting process based on a high-strength cast pouring cup outer frame. The casting process includes acquiring process state parameters at detection points, obtaining outer frame thermal field parameters and interface pressure field parameters, fusing them to generate a comprehensive pouring feature vector, inputting it into a process state recognition model, determining the current process state category and outputting the category confidence score, thereby obtaining a process category selection set and an accurate recognition rate to determine whether the recognition result meets the standard; selecting the corresponding process state category from the selection set and determining the corresponding compensation degree, thereby performing compensation control operations; finally, determining the control efficiency index based on the re-acquired process state parameters after the compensation control operation, and determining whether to adjust the preset compensation degree until the control effect meets the standard. This invention solves the problem of isolated process parameters and inability to adaptively adjust in existing technologies, effectively improving the demolding success rate and reducing the casting defect rate.

The invention discloses a process for producing high-performance cast balls on a V-method production line, which comprises an electric heating box, an air exhaust sand box, a vacuum air exhaust pipeline, a cast ball model, a jolt rammer, a negative pressure box, a sand storage tank and a hydraulic system, the hydraulic system is associated with the electric heating box, and the vacuum air exhaust pipeline is communicated with the air exhaust sand box. The vacuum-pumping V-method production line technology is adopted, the air exhaust sand box is matched with the ball casting model and the model plate to generate negative pressure, molten iron mold filling is smoother, internal casting defects are reduced, meanwhile, only a vacuum pump and a sand storage tank need to be additionally arranged on the V-method production line, equipment is simple and convenient to maintain, and production efficiency is improved. The rectangular plate B on the air exhaust sand box and the rectangular plate A on the model plate are in butt joint and are matched with the sealing embedded blocks to be inserted into the rectangular embedded grooves for positioning, dismounting, replacing and overhauling are convenient, efficient vibration reduction is provided for the vibration compactor through cooperation of the hydraulic buffer rods and the buffer springs and the rubber air bag buffers, and the vibration reduction performance and the vibration compaction effect are improved.

This invention discloses an integrated adaptive filling and venting device for high-pressure casting of aluminum alloys, comprising a mounting plate integrally formed from high-strength cast iron, serving as the mounting and bearing foundation for the entire device. A support base is bolted to the top, the support base being a hollow frame structure with an open top, used to support and provide stable support for the fixed mold base. The fixed mold base is located on top of the support base, and the fixed mold base is sealed and fixedly connected to the support base. A mold groove is provided on the top of the fixed mold base. This device achieves integrated and automated filling, venting, and demolding. Adaptive reciprocating filling and venting thoroughly removes impurities from the mold cavity, avoiding casting defects; gas-free demolding protects casting precision; precise pressure control adapts to multiple casting specifications; compact structure, reliable operation, improves production efficiency and casting qualification rate, reduces labor and maintenance costs, and meets the needs of high-end aluminum alloy precision casting.

This invention relates to the field of crucible casting technology, specifically disclosing a crucible installation method for reducing casting inclusions, comprising the following steps: S1, laying and compacting sand at the bottom of the coil; S2, placing the crucible, ensuring the top of the crucible is higher than the top of the coil, and burying sand around the crucible and in the gap between the crucible and the coil; S3, stopping the sand burying at a distance of 2-4 cm from the top of the coil; S4, plugging the remaining 2-4 cm gap with insulating cotton; S5, after the insulating cotton is compacted, tightly attaching a high-temperature resistant plate to the outer wall of the crucible and placing it on top of the coil and insulating cotton, then fixing it with fasteners. This invention reduces defects caused by crucible installation by improving the sealing method, thereby reducing the proportion of casting defects. The crucible is buried in the coil, the gap is filled with sand, and the final sealing is changed to first plugging with insulating cotton, then using a high-temperature resistant plate to form a shape that tightly fits the crucible to the outer wall and is installed on the coil, minimizing the risk of sand falling from the coil.

The application provides a cast defect detection and identification method, device, equipment and storage medium, and belongs to the technical field of image data processing. The method comprises the following steps: obtaining a cast image and cast information of a target cast, and matching the target cast and a plurality of historical casts according to the cast information to determine a plurality of reference casts from the plurality of historical casts; dividing each reference cast into a plurality of detection regions, wherein the number of detection regions of each reference cast is the same and the positions correspond; determining a plurality of to-be-detected regions of the target cast and a detection sequence of the plurality of to-be-detected regions according to the defect frequency of each detection region of each reference cast; sequentially extracting image feature parameters of the plurality of to-be-detected regions from the cast image of the target cast according to the detection sequence of the plurality of to-be-detected regions of the target cast; and determining defect information of the target cast according to the image feature parameters of the plurality of to-be-detected regions. The application can effectively improve the cast defect detection efficiency.

The present application relates to the technical field of casting defect detection, and particularly relates to a die casting defect detection method, system and device for aluminum alloy die castings. According to the change degree of thickness data of pixel points in a suspected defect area in an X-ray image, the stable degree of gray scale change and the regular degree of edges, a registration compliance degree is obtained, and a non-registration artifact area in the suspected defect area is selected. According to the non-uniformity degree of gray scale and the irregularity degree of shape of the non-registration artifact area, a defect gray scale shape compliance degree is obtained. According to the thickness data of pixel points in the non-registration artifact area and the change degree thereof, an overlapping thickness compliance degree is obtained. According to the defect gray scale shape compliance degree and the overlapping thickness compliance degree, a final defect area in the non-registration artifact area is selected. The present application comprehensively considers morphological characteristics and thickness characteristics, removes interference caused by projection superposition of three-dimensional structures and registration error of CAD models, and improves the accuracy of die casting defect recognition.

The invention belongs to the technical field of low-pressure casting, and particularly relates to a low-pressure casting device and method for a large-size aluminum alloy shell metal outer mold composite sand core, the height of a large-size aluminum alloy shell casting is not lower than 600 mm, the inner diameter is not lower than 700 mm, and the average wall thickness is 14-20 mm; the low-pressure casting device comprises a mold system, a sand core system, a pouring system, a chilling block system and a dead head, the pouring system adopts a bottom pouring and stepped pouring mode, the structure of the pouring system is designed according to the height, the transverse characteristic size and the average wall thickness of a casting, the pouring system is deeply optimized, and the casting quality is improved. By adopting the design mode of multiple sprues and circumferentially and uniformly distributed transverse sprues, it is ensured that a feeding channel is solidified later than a casting, the pressure maintaining pressure is continuous and effective, the casting defects of cold shut, air holes, shrinkage cavities, shrinkage porosity and the like are avoided, the mechanical property and air tightness of the large-size casting are remarkably improved, and the cost rate is increased.

The present application relates to a kind of ultra-high purity copper smelting casting method, the smelting casting method includes: the copper material is carried out vacuum smelting, when the vacuum degree becomes 280-310 times of the vacuum degree when vacuum smelting starts in process, vacuumizing is carried out, then in turn, heat preservation and casting are carried out;The casting speed is gradient change in the casting.This smelting casting method provided by the present application realizes the preparation of ultra-high purity copper ingot by the design of vacuum degree in vacuum smelting and the combination of specific casting process, the purity of the obtained ultra-high purity copper is ≥99.9999%, and there is no inclusion and no casting defects such as internal or surface hole.

The invention relates to the technical field of motor shell machining, and discloses a cutting device for vibration motor shell machining, which comprises a cutting table, and further comprises an equipment box fixedly connected to the lower part of the cutting table and used for supporting the cutting table; the clamping mechanism is arranged in the equipment box and is used for clamping a machine shell; and the bottom of the cutting machine rotates around the machine shell on the cutting table through a rotating mechanism for cutting. By means of the rotating mechanism, constant initial feeding force is provided through the first tension spring, meanwhile, self-adaption of the cutting process is achieved through a one-way pawl mechanism composed of a deflector rod and a limiting hole with a rectangular bayonet, when the wall thickness is not uniform or casting defects occur, cutting counter-force can push the cutting machine to slightly retreat in the radial direction for buffering, and the cutting effect is good. And when the cutting condition is normal, the mechanism can lock and allow continuous feeding, knife pricking, tipping and even workpiece damage caused by sudden change of cutting force can be greatly avoided, and the mechanism is particularly suitable for machining characteristics of a vibration motor casting shell.

The invention provides a high-strength and high-toughness aluminum-lithium alloy plate and a preparation method thereof, and belongs to the technical field of metal materials and metallurgy. According to the method, an aluminum-lithium alloy cast ingot with excellent casting performance is cast through alloy elements in scientific proportion and a precise smelting process, most casting defects are eliminated through hot rolling deformation, sufficient machining strengthening is obtained through cold rolling deformation, then two-section pre-deformation is conducted on an aluminum-lithium alloy plate subjected to solution treatment, the dislocation density is increased, and the machining strength of the aluminum-lithium alloy plate is improved. The aging precipitation power of the alloy is remarkably improved, a large number of fine and dispersed T1 (Al2CuLi) phases and theta '(Al2Cu) phase strengthening phases are precipitated in the aging process, the strength, toughness and plasticity of the aluminum-lithium alloy are effectively improved, a destressed high-strength and high-toughness aluminum-lithium alloy plate with the flat appearance is obtained, the yield strength can reach 520-560 MPa, the tensile strength can reach 580-630 MPa, the ductility is 8-12%, and the tensile strength can reach 580-630 MPa. And the use requirements of high-standard aerospace structural materials can be met.

The present application relates to a kind of low-alloy high-strength steel continuous casting billet organization regulation method, belong to continuous casting billet hot charging technical field.The method includes: the continuous casting billet just out of furnace is sent into sealed heat sending channel by foot roller, entrance and exit are installed the elastic sealing curtain of high-temperature resistant rubber material, side wall uses heat preservation cotton heat preservation, and nitrogen is used as protective atmosphere;Control channel temperature is 900~920 ℃, and heat preservation 1.2~1.8 h;Continuous casting billet temperature is reduced to 630~670 ℃, and heat preservation 0.8~1.2 h;Natural cooling, rolling or offline stack cooling.The present application is by optimizing heat sending temperature control system, while reducing the quantity of iron oxide skin, using continuous casting billet waste heat to eliminate as-cast defect, improve continuous casting billet quality, to improve steel organization uniformity and processing formability, suitable for batch production of heat sending hot charging technology.

This invention relates to a casting method for complex valve body castings, comprising the following steps: an analysis step, in which the gating system is designed according to the valve body structure, and the heat distribution and heat dissipation during the casting process are analyzed to determine the heat dissipation location data and heat dissipation rate data; a chilling step, in which chills are fabricated based on the heat dissipation location data and heat dissipation rate data; a sand core preparation step, in which sand cores are fabricated based on the heat dissipation location data and heat dissipation rate data; a box-closing casting step, in which the sand core is placed in the sand box, the chills are inserted into the sand box, and then the box is closed, with the casting volume gradually increasing during the casting process; the casting temperature is 1610-1630℃; inert gas is introduced at the beginning of the casting process; the amount of inert gas is gradually reduced; and a box-opening and cleaning step, in which the sand box is slowly cooled to 300℃ before opening; after opening the box, the sand is cleaned and the gating system is cleaned. This method solves the problem in existing solutions where uneven valve body wall thickness leads to uneven heat dissipation, resulting in casting defects within the valve body.

A casting mold structure of indirect chillers of a thick and large-section as-cast nodular iron casting is characterized in that the structure comprises a casting mold cavity formed by casting molding sand, the casting mold cavity is provided with a plurality of outer surfaces, and a plurality of indirect chillers are arranged on the corresponding sides of the outer surfaces at intervals; molding sand layers are filled between the indirect chillers and the casting cavity and between the multiple indirect chillers. The utility model discloses a casting mold structure of an indirect chilling block. The casting mold structure for the thick and large-section as-cast nodular iron casting has the advantage that the casting defect of a direct chilling block is effectively overcome due to the arrangement of the indirect chilling block.

The application discloses an economical boron-containing stainless steel for hot neutron absorption, which comprises the following steps: (1) component design; (2) smelting molten steel according to the set component in a vacuum environment, applying electromagnetic stirring in a smelting process, and carrying out casting under a nitrogen protection atmosphere to obtain a casting blank; (3) homogenizing heat treatment of the casting blank for 240-720 min between Ac3 and the melting point of boride (T f ); air cooling to room temperature after discharging; (4) after removing casting defects, inclusions and slag foreign matters by grinding the casting blank after heat treatment, carrying out hot deformation and solid solution treatment; the hot deformation heating temperature and the solid solution treatment temperature are respectively T f 10-80 DEG C and 30-100 DEG C. The application is aimed at the characteristics of high cost and poor hot plasticity of the traditional boron-containing stainless steel for hot neutron absorption, reduces the use of precious metal Ni, improves the hardness of the matrix structure, enhances the deformation coordination of the matrix and boride, greatly improves the hot plasticity, and improves the hot deformation capacity of the material.

The invention discloses an overturning platform for sand mold casting construction and a construction method.The overturning platform comprises two door frames, a base and a bearing frame, the bearing frame is rotationally connected between the two door frames, limiting chucks are arranged on the outer walls of the two ends of the bearing frame, at least three clamping grooves are formed in the edges of the outer rings of the limiting chucks, and the limiting chucks are arranged in the clamping grooves; a connecting shaft is arranged in the center of the outer wall of the limiting chuck and connected with the portal through a bearing seat, a nut is arranged at the top of the bearing seat, an inserting rod is connected into the nut through threads, the inner end of the inserting rod extends into the clamping groove, and a transfer trolley is arranged on the ground on one side of the bearing frame. By integrating the overturning and transferring functions, stable overturning and efficient transferring of the sand box are achieved, the quality and size precision of castings are improved, the defects of the castings caused by misoperation are reduced, the labor intensity of workers is effectively relieved, and the safety risk caused by manual misoperation is reduced.

A method of repairing a casting defect in a die-cast part includes operating a mechanical bit within a void space formed in a die-cast part to generate plasticized local material along an inner surface of the void space to close one or more casting defects in a vicinity of the void space. The void space may be a hole bored in the part, or a channel or passage formed in the part. The casting defect may be a porosity formed in the part. A tool for repairing a casting defect in a die-cast part includes a bit operable by a drill. The bit includes a shank and an elongated body extending in an axial direction from the shank. The body is configured to generate plasticized local material along a surface defining a void space in a die-cast part. The plasticized local material closes a casting defect formed in the part, and plasticized material may flow into the casting defect.

The invention discloses a mold shell roasting device with a transposition function, and relates to the technical field of mold shell roasting, the mold shell roasting device comprises a roasting furnace, the two ends of the roasting furnace are each provided with an inlet and outlet, and the inner side of each inlet and outlet is provided with a conveying rail; and the bearing frame is installed on the top of the conveying track, and the bearing frame is conveyed into the roasting furnace through a driving structure installed on the conveying track. Through cooperation of parts such as a second shaft rod and the like, a second chain drives multiple groups of trays to perform transposition operation, so that a mold shell on the inner side of the bearing frame and a mold shell position close to roasting furnace fire perform circumferential rotation transposition, and each mold shell can enter a high-temperature area (close to a second chain wheel) and the inner side of the bearing frame in a relatively low-temperature area in turn; finally, the accumulated total heating amount of all the mold shells is consistent, the roasting quality problem caused by local temperature deviation is avoided, and therefore it is ensured that the overall roasting quality of the mold shells is consistent, and the casting defect risk is reduced.

A novel aluminum alloy wheel hub mold lower mold includes a lower mold, a water-cooling block, a water-cooling plate, a partition plate, a pressure plate, and bolts. During assembly, the partition plate and pressure plate are first placed sequentially into the sealing groove of the water-cooling plate, with water inlet hole one corresponding to water inlet hole two, and water outlet hole one corresponding to water outlet hole two. They are then fixed by welding. Simultaneously, the water-cooling block is installed onto the lower mold, with its head corresponding to its mating groove. The assembled water-cooling plate is then placed into an annular groove and pressed onto the water-cooling block. The through holes on the water-cooling plate correspond to the bolt holes on the lower mold. Finally, it is fixed with bolts. This design achieves rapid temperature reduction at hot spots and reduces casting defects in other locations. The structure is simple and easy to operate, significantly improving production efficiency and yield, thereby reducing the manufacturing cost of the wheel hub.

The invention discloses a laminated thin plate structure based on heat-machine cooperative regulation and control and a micro-casting-forging connection method and application thereof. The method comprises the steps that firstly, prefabricated hole arrays communicating with one another are machined in preset areas of multiple layers of metal sheets to be connected; then solid-liquid critical state alloy slurry with specific performance is injected; the key innovation lies in that before the slurry is completely solidified in the hole or in the solidification process of the slurry, local mechanical forging pressure is applied to a connector in a semi-solid state or a high-temperature plastic state, and in-situ micro-forging is carried out. The casting and forging composite technology can effectively eliminate casting defects, refine crystal grains and enhance interface metallurgical bonding, and finally a high-performance micro-casting and forging connector is formed. The invention also relates to a laminated sheet composite sealing structure manufactured by the method. The method is particularly suitable for manufacturing of thin-wall bearing or sealing structures in the aerospace field, traditional riveting and screwing can be effectively replaced, and remarkable weight reduction and efficiency improvement and excellent fluid sealing performance are achieved.

The invention discloses a casting method for prolonging the service life of a metallurgical slag pot, and relates to the technical field of metallurgical casting. According to the method, the material ratio is optimized, and low-alloy heat-resistant steel containing Cr, Ni, Mo, V and Ti is adopted as a matrix; the casting process is optimized, quartz sand and chromite sand composite sand is adopted, lost foam casting and stepped cooling are adopted, and casting defects are reduced; through quenching and tempering heat treatment and Al2O3-TiO2 ceramic coating surface strengthening, the high-temperature erosion resistance, corrosion resistance and thermal shock resistance of the slag ladle are improved. The prepared slag ladle is complete in structure and stable in performance, the service life is prolonged to 1500 heats or above and is improved by 60% or above compared with the prior art, the technology is mature and controllable, the slag ladle is suitable for industrial batch production, the production cost of metallurgical enterprises can be effectively reduced, and the slag ladle has important industrial application value.