3808results about "Foundry cores" patented technology

The invention discloses a casting production device of a corrosion-resistant cast iron cylinder sleeve, and relates to the technical field of cylinder sleeve casting, the casting production device comprises a bottom frame, a bottom shell is fixed on the top surface of the bottom frame, two sliding grooves are formed in the top surface of the bottom shell, the cylinders are fixed on four edges of the top surface of the bottom frame, and the top shell is fixed on the top of the outer wall of the cylinders. An electric hydraulic rod penetrates through and is fixed to the middle of the top face of the top shell, a sliding shell is fixed to the bottom face of the telescopic end of the electric hydraulic rod, the inner wall of the sliding shell is slidably connected with the outer wall of a cylinder, a round mold is arranged in the middle of the bottom face of the sliding shell, a sand mold block and a U-shaped frame are placed in the middle of the top face of the top shell, and the U-shaped frame is fixed to the bottom end in the bottom shell. The sand mold block is clamped and positioned through the two U-shaped frame plates, so that the problem that the casting effect of the corrosion-resistant cast iron cylinder sleeve is poor due to the fact that the sand mold block deviates on the table top is solved.

The invention belongs to the technical field of motor casing lost foam casting, and particularly relates to a special coating for a motor casing lost foam as well as a preparation method and application thereof. Through a quantitative formula design method, an aggregate proportion calculation formula based on thermal expansion coefficient matching and a grain size distribution correlation formula based on target air permeability, cooperative compounding of quartz powder and bauxite is achieved, and key functional components such as mullite, organic matter fibers and crystalline flake graphite are combined; the unification of high air permeability and excellent crack resistance of the motor shell lost foam coating is realized. The invention further provides a two-time coating gradient drying efficient process matched with the coating, and on the premise that the coating performance is guaranteed, the production efficiency is remarkably improved, and the energy consumption is reduced.

The invention discloses a manufacturing method of 925 silver jewelry, which comprises the following steps: S1, preparing alloy components, S2, designing a cast tree structure, S3, casting, and S4, densifying a casting, the alloy components comprise 92.5-93.0% of silver, 1.0-3.0% of platinum, 0.05-0.5% of copper, 1.5-3.5% of zinc, 1.5-3.5% of indium, 0.03-0.3% of tin, 0.05-0.5% of germanium, 0.03-0.3% of rare earth, and 0.003-0.02% of boron. According to the manufacturing method, alloy components are optimized, the casting performance of the alloy components is improved, the casting process is optimized, the feeding capacity of molten metal is improved, shrinkage porosity and air holes are reduced, the initial density of the casting is improved, and subsequent composite treatment is carried out, so that the density from the surface to the shallow surface of the casting is further improved, grains are refined, and the surface roughness is further reduced; and the requirement of high brightness of the jewelry surface is met.

The invention relates to a large-scale high-temperature alloy blank casting method capable of controlling the casting size, and belongs to the technical field of high-temperature alloy casting. Measuring a temperature curve of the sand mold after the high-temperature alloy is poured; a process model is created, simulation software is used for carrying out stress deformation simulation, a part model of the casting is created, the simulation result of the part model and the simulation result of the process model are compared, the reduced scale, correction and the machining amount are adjusted in real time, and the process model is obtained; manufacturing a process pattern according to the process model, and producing a sand mold by utilizing the process pattern; creating a sand core model, inputting sand mold temperature curve parameters into simulation software, carrying out sand core deformation stress simulation, measuring sand core deformation stress, and manufacturing a core box according to the sand core model; a core bar is manufactured according to the design, the manufactured core bar is placed in a core box, and a sand core is manufactured; demolding the sand core; combining the sand core with the sand mold to obtain a casting cavity; and molten steel is poured into a casting cavity, and a casting blank is formed after cooling and solidification.

The utility model relates to the technical field of hub casting, in particular to an aluminum alloy hub casting forming die which comprises a lower die and an upper die, two limiting sleeves are connected to the tops of the two sides of the lower die respectively, and the tops of two sets of hooks are rotationally connected with the side wall of the upper die through fixing shafts respectively. The bottoms of the two sets of hooks abut against the side walls of the limiting sleeves correspondingly, connecting shafts are perpendicularly connected to the centers of the side walls of the two sets of hooks, air cylinders are installed on the two sides of the bottom of the lower die correspondingly, push blocks are installed on output shafts at one ends of the two air cylinders correspondingly, driving rods are rotationally connected to the two push blocks correspondingly, and a top plate is arranged on one sides of the two sets of hooks. The two ends of the two top plates are rotationally connected with the two connecting shafts correspondingly, and the tops of the two driving rods are rotationally connected with the centers of the bottoms of the top plates through top blocks correspondingly. The locking control can be quickly carried out on the end parts of the two sides of the upper and lower dies, the locking effect is good, meanwhile, die opening control can be carried out, and finished product blanking is facilitated.

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 application relates to the technical field of foundry molding, in particular to an aluminum alloy casting sand core molding machine; the machine comprises a base and a stand column fixedly connected to the rear position of the upper surface of the base; the upper end of the stand column is rotationally connected to a top base provided with an upper hydraulic cylinder; the lower end of the upper hydraulic cylinder is fixedly connected to a pressing plate; the front position of the upper surface of the base is fixedly connected to a support through a lower hydraulic cylinder; a plurality of electric push rods are embedded in the upper surface of the support; the upper surface of the support is provided with a mold plate provided with a mold sample and a rod groove; the mold plate drives a sand frame to move up and down in a hopper through control, so that a pressing strip can repeatedly beat the coated sand on the upper end of the sand frame, and the hopper assists the coated sand on the upper end of the sand frame to be supplemented, the coated sand in the sand frame is more compact and uniform in filling and pressing, the quality of the formed sand mold is improved, and compared with manual filling and pressing, the machine is more efficient and convenient.

The invention discloses a precision gear mold, and relates to the field of industrial machining, the precision gear mold comprises a mounting frame, the mounting frame is U-shaped, an upper top plate is arranged at the top of the mounting frame, a mold main body is arranged on the mounting frame, the mold main body comprises an upper mold and a lower mold, a placement groove is formed in the lower mold, and the upper mold is provided with a positioning groove; a bottom forming plate is arranged in the containing groove, an open groove matched with the containing groove is formed in the upper mold, and a top forming plate matched with the bottom forming plate is arranged in the open groove. The optical camera is aligned with a positioning point, the limiting lantern ring is matched with the limiting shaft, the mounting block is in butt joint with the mounting groove, and the limiting rod is matched with the limiting hole, so that rapid die combination and precise positioning are achieved, and a foundation is laid for precise gear die casting.

The invention discloses a high-deformability ceramic core with a compact surface and a porous core structure and a preparation method of the high-deformability ceramic core. The ceramic core is formed by compounding a ceramic core with the porous core structure and a compact inert coating on the outer surface of the ceramic core, the ceramic core with the porous structure at the core part comprises the following substances in percentage by weight: 42 to 51 percent of ceramic powder component, 35 to 40 percent of hollow glass bead component, 4 to 9 percent of fiber component, 3 to 7 percent of graphite and 2 to 8 percent of starch; and the densified inert coating comprises the following substances in percentage by weight: 67 to 75 percent of sol component and 25 to 33 percent of nano powder component. The preparation method comprises the following steps: preparing a core porous structure ceramic core and densified inert coating slurry; and the ceramic core with the porous structure at the core part is impregnated with the densified inert coating slurry under sectional vacuum pressure in a gradient pressure reduction manner, and then is put into a heat treatment furnace for sintering treatment. The prepared ceramic core has excellent deformability, the problem of blade hot cracking can be solved, interface reaction can be avoided through the inert coating, and efficient depoling is facilitated through the porous structure of the core.

The invention relates to the technical field of casting molds, and discloses an automobile planet carrier casting mold which comprises a mold plate arranged between an upper mold and a lower mold, an upper sand mold, a lower sand mold, a sand core and a sprue are installed on the mold plate, and the sand core is located between the upper sand mold and the lower sand mold and used for blocking cavity communication of the upper sand mold and the lower sand mold; guide columns corresponding to the upper and lower dies are mounted on the upper and lower end faces of the template, and are inserted into guide holes of the upper and lower dies, so that accurate die assembly is realized. Through combination of the upper sand mold, the lower sand mold and the sand core, the mold can mold an upper casting and a lower casting at the same time by using the sand core to block communication of the mold cavity, the production efficiency is greatly improved, the thickness of the sand core is set to be 0.8 times of the wall thickness of the casting, shrinkage porosity linearity caused by a hot spot in the casting can be avoided, and meanwhile, the production efficiency is improved. The pouring gate supplies liquid to the upper sand mold and the lower sand mold through the residue filter, impurities in molten metal are removed through the filtering assembly, the shrinkage porosity defect caused by the impurities is reduced, and therefore the qualification rate of castings is increased.

The invention discloses a molten metal fluidity improving method and system in the V-method casting process, and relates to the technical field of casting, a high-pressure airflow and mechanical brush composite mode is adopted for cleaning a casting mold cavity and preheating the casting mold cavity, and precoated sand is selected for preparing a sand mold through vacuum negative-pressure compaction; a sectional type negative pressure regulation and control strategy is adopted, and the stepped composite pouring gate structure is optimized; degassing the molten metal by argon or nitrogen, controlling the temperature, and adding an inoculant and a flow promoter in proportion; the casting speed is controlled according to the three-section type rate through the casting table with the adjustable inclination angle; arranging an insulated riser at the thick and large part of the casting, maintaining a negative pressure field after casting, and covering an insulating material; dividing cooling areas according to wall thickness, and gradually relieving pressure after cooling to a set temperature; and after shot blasting and flaw detection, recording data and establishing a process parameter-flowability association database. Through mold preheating, negative pressure gradient regulation and control and pouring gate design improvement, the molten metal fluidity is remarkably improved, and the casting quality stability and the production efficiency are greatly improved.

The invention relates to the technical field of special functional coating materials for lost foam casting, and particularly discloses a special coating for a large machine tool casting lost foam as well as application and a use method of the special coating. According to the invention, the full-temperature-range functional composite material and the composite aggregate are used for synergistic reinforcement, and mullite is used for high-temperature reinforcement; the temperature-sensitive polymer modified graphite can realize intelligent temperature response of graphite performance; spodumene is used as a thermal expansion adaptive fluxing agent, so that medium-temperature healing and thermal expansion adjustment of a coating system are facilitated; the composite reinforced fibers are reinforced and toughened aiming at large thermal stress of thick and large parts; as an ultralow-temperature glazing agent, the boron-containing glazing agent can form an initial liquid phase at about 450 DEG C to seal the surface of the coating and purify a ventilation channel; the rare earth oxide serving as a high-temperature phase stabilizer can be dissolved in mullite crystal lattices, so that the high-temperature phase stability is improved, and ceramic nodes are refined. Through raw material design, on the premise of ensuring moderate air permeability, the ultrahigh strength and crack resistance of a coating system at extremely high temperature are improved.

The invention relates to the technical field of sand mold casting, and particularly discloses a gradient exhaust sand mold for an aluminum alloy thin-walled workpiece and a preparation method thereof.The sand mold comprises a cavity surface layer (with the hardness ranging from 90 HB to 95 HB), a transition layer (with the hardness ranging from 80 HB to 70 HB and a back sand layer (with the hardness ranging from 60 HB to 65 HB) which are arranged from inside to outside, and microporous ceramic exhaust rods (with the diameter ranging from 0.3 mm to 0.8 mm and the distance ranging from 1 mm to 3 mm) are embedded in the cavity surface layer; the exhaust rod is composed of a mullite fiber matrix and a nanometer gamma-AlO coating, the porosity is 40-50%, and the exhaust rod penetrates through the back sand layer to form a directional exhaust network. The preparation method comprises the following steps: mixing sand layer by layer (the cavity layer contains 1.0-1.5% of phenolic resin, and the back sand layer contains 0.4-0.6% of resin and 4-6% of starch); when sand is filled to the position 1-3 mm away from the surface of the cavity, an exhaust rod is implanted (the positioning precision is + / -0.1 mm); gradient compaction is carried out (the high pressure of a cavity is 3.0-4.0 MPa, the vibration of a transition area is 20-30 Hz, and the back sand airflow is 0.1-0.2 MPa); and carrying out microwave curing (2.5 to 3.5 kW, 60 to 120 s). The defects of hot cracks and air holes of the thin-wall part (smaller than or equal to 5 mm) are overcome synchronously, and the casting yield is increased to 95% or above.

The invention provides a brake disc air duct core and a manufacturing method thereof and a core box device, and relates to the technical field of casting devices.The brake disc air duct core is characterized in that a plurality of strip-shaped air ducts are evenly formed in the surface of a sand core body, the air ducts extend from the center of the sand core body to the edge, and the sand core body protrudes around the periphery of the sand core body in the vertical direction to form an outer ring core head; the middle of the sand core body protrudes in the vertical direction to form a middle core head, a protruding sand shooting face is arranged at the top of the middle core head, the middle core head and the bottom of the sand shooting face are hollow to form a middle sand core runner, and the technical problems that in the prior art, filling is insufficient in a thin-wall area or the edge, and the forming effect is poor are solved. The technical effect of improving the forming rate and the structural stability is achieved.

The invention relates to the technical field of titanium alloy investment precision casting, and particularly provides a titanium alloy multistage deep blind hole investment casting method which comprises the following steps: designing an exhaust hole and a slag removal hole; establishing a model; assembling and welding; soaking the surface layer in a vacuum negative pressure environment, continuously vacuumizing, deflating after soaking, taking out the module, and rotating to uniformly control the slurry; preparing a surface layer; performing segmented grouting on the deep blind hole; making a shell from a back layer; roasting and molding; washing and drying; pouring is conducted; shell cleaning and sand blasting; sealing and welding the process holes; and performing stress relief annealing. And a dynamic vacuumizing means is adopted, and a vacuumizing device is always kept in an open state, so that the compactness of a surface layer is improved, and burrs of a casting are reduced. Through vacuum dynamic slurry immersion, segmented grouting and collaborative design of the exhaust hole and the slag removal hole, investment precision casting forming of the high-precision oil pump shell can be supported, the shell manufacturing efficiency of the multi-stage deep blind hole is improved, and the filling defect rate is reduced.

The invention relates to a method for manufacturing a hollow turbine blade (10) for a turbine engine, the hollow blade (10) comprising a pressure side wall (16) and a suction side wall (18), an internal cooling channel (28) passing through the pressure side wall and the suction side wall, the invention relates to a method for manufacturing a blade (10), comprising at least a first moulding stage (PH1, PH '1) using a lost wax casting technique using molten metal, the first moulding stage (PH1, PH' 1) comprising at least one step b) of manufacturing a mould (34) made of a refractory material, the inner wall (36) of the mould being matched to the outer shape of the blade (10) to be manufactured, in which step b) the inner wall (36) of the mould (34) is matched to the outer shape of the blade (10) to be manufactured. A plurality of protrusions (52) are formed on an inner wall (36) of a mold (34) made of refractory material, the plurality of protrusions defining an outlet opening counter-shape (30) of an internal cooling channel (28).

The invention discloses evanescent mode casting equipment and technology for a gearbox shell of a new energy commercial vehicle, and belongs to the technical field of evanescent mode casting. The evanescent mode casting equipment is characterized in that a jolt ramming mechanism is installed in a workbench, a sand box is placed on the jolt ramming mechanism, a sand receiving mechanism and a screening mechanism are slidably arranged on the workbench, and the sand box comprises a box body; a second rectangular plate and a third rectangular plate are arranged in a sliding mode, the first rectangular plate and the second rectangular plate are connected in a clamped mode, the second rectangular plate and the third rectangular plate are perpendicularly distributed, the second rectangular plate slides outwards to achieve separation of the first rectangular plate and the second rectangular plate, meanwhile, the first rectangular plate can be driven to rotate downwards by a small angle, and falling of gravel in the sand box is achieved; and after the sand and the stones are completely fallen, the rotation angle of the first rectangular plate is driven to be increased, so that the falling of the castings in the sand box can be realized, the three-stage separation of sand and the stones, impurities and the castings is further realized, the separation processes do not interfere with each other, the operation is simple, and manpower and time are saved.

An electromagnetic stirring low-pressure casting pouring system (100) comprises a flask, a sprue (110), a runner (130), a mold cavity (150) and a riser (170) being formed in a core inside the flask, wherein the runner is arranged at a top end of the sprue and is in communication with the sprue, the runner is in communication with the mold cavity, the riser is in communication with the mold cavity, overflow ladles (190) are arranged on two sides of or around the sprue, and top ends of the overflow ladles are in communication with the top of the sprue and are located below the runner, such that molten metal in the sprue overflows to the overflow ladles during pouring, and sequentially flows to the runner, the mold cavity and the riser after the overflow ladles are filled. Also provided is electromagnetic stirring low-pressure casting pouring equipment comprising the pouring system. By means of the present electromagnetic stirring low-pressure casting pouring system, the additionally designed overflow ladles enable the collection of the initial molten metal, which contains a number of impurities, and provide effective filtration of the impurity-laden molten metal, thereby further ensuring the quality and properties of the casting.

The invention discloses a laser cleaning method and system for residual sand of a sand casting mold, and the method comprises the steps: S1, obtaining point cloud data of the surface of the mold through a three-dimensional scanner, reconstructing a triangular mesh model M (V, E, F) of the surface of the mold, V being a vertex set, E being an edge set, and F being a surface set; s2, based on the triangular mesh model, a laser cleaning path is planned; S3, a laser head is controlled to move along the path, and laser is emitted to remove residual sand; according to the method, the residence time calculation model is introduced, the laser residence time is dynamically set by combining the region area, the material removal difficulty coefficient and the characteristic parameters, the adhesion strength signal of the surface of the mold under the laser action is detected in real time through the acoustic emission sensor, error feedback is formed, the laser power, the pulse frequency and the residence time are dynamically adjusted, and the mold surface quality is improved. And the self-adaptive response to the thickness and the adhesion strength of the residual sand in different areas is realized.

The utility model relates to a through-type drawing device for a plurality of large iron molds with different cavities, and belongs to the field of machinery. The device comprises movable trolley tracks, a lifting travelling crane, a plurality of movable trolleys, a fixed iron mold and a model drawing separation mechanism, the movable trolleys are all arranged on the movable trolley tracks, the movable trolley tracks are arranged on the two sides of the fixed iron mold and the model drawing separation mechanism, the lifting travelling crane is arranged above the fixed iron mold and the model drawing separation mechanism, and the lifting travelling crane is arranged above the fixed iron mold and the model drawing separation mechanism. Two rails are installed on a base in the fixed iron mold and model drawing separation mechanism, drawing supports are fixed to the two sides of the rails, two lifting drawing hydraulic cylinders are installed in the upper plane of each drawing support, a plurality of clamping mechanisms are fixed to each drawing support, and two drawing beams are fixedly connected through two drawing supporting beams. The device is reasonable in structural design, convenient to install, reliable in operation, low in labor intensity, high in mechanization degree, good in drawing quality of an iron mold casting mold, smooth in technological process and capable of meeting use requirements.

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 intelligent low-stress sand casting method for a high-end numerical control machine tool basic large part, and belongs to the crossing field of mechanical manufacturing automation and a sand casting technology. According to the intelligent low-stress sand mold casting method for the basic large part of the high-end numerical control machine tool, different sand mold structures are selected for manufacturing parts with different moduli based on the obtained machine tool structural part model. A multi-material hollowed-out intelligent sand mold is selected for forming a high-modulus part, and the part of the sand mold comprises three main parts, namely a surface contact area, a hollowed-out sand mold area and an intelligent control unit. The part with the low modulus is formed by an intelligent compact sand mold, the sand mold of the part is based on a traditional compact sand mold, and a heating material and a control system are arranged in the sand mold. According to the method, the solidification process of each part of the machine tool casting can be intelligently regulated and controlled, so that low-stress casting of the casting is realized, the time required by subsequent aging is shortened, the production responsivity of the machine tool casting is improved, and production and development of a high-precision and high-stability machine tool are promoted.

The GDC casting mold comprises a left mold body and a right mold body, corresponding forming cavities are formed in the left mold body and the right mold body, sand cores are arranged in the forming cavities, riser cavities are communicated beside the forming cavities, vent holes are formed in the riser cavities, ejector pin rods are movably inserted in the vent holes, the ejector pin rods are of a hollow rod structure, and the ejector pin rods are of a hollow rod structure. One side of the ejector pin rod is fixed on an ejector plate, one side of the ejector plate is connected with an ejector driving piece, a vacuum generator is arranged on the ejector plate, one end of the ejector pin rod is communicated with a vacuum port of the vacuum generator, and an air supply port of the vacuum generator is communicated with an external compressed air supply source. According to the GDC casting mold, the dead head cavity communicates with the side of the forming cavity, waste gas left in the mold filling process of molten metal is gathered in the dead head cavity and is efficiently discharged along the vent hole, the ejector pin rod and a discharge outlet of the vacuum generator under the assistance of vacuum negative pressure, and the defects of air holes, shrinkage cavities or shrinkage porosity of castings are avoided; the compactness and the surface quality of the casting are influenced.

A core quality estimation system that estimates quality of a core to be formed by filling a mold with kneaded sand produced by kneading in a kneading tank and heating the kneaded sand includes a computer that executes operations of acquiring mold temperature information of the mold, acquiring environmental information regarding a surrounding environment in which the core is formed, and estimating the quality of the core based on the mold temperature information and the environmental information.

The disclosure concerns printable refractory compositions, more particularly ceramic- based pastes for 3D printing of molds for additive metal casting. In particular, the present disclosure concerns composition for forming mold regions having modified thermal conductivity and dissipation and increased release of gaseous products therefrom during heating to mitigate mechanical failure risks in an additive casting process of metal objects.

The invention discloses a preparation method of a corrosion-resistant and impact-resistant high manganese steel wear-resistant lining plate, and relates to the technical field of wear-resistant materials, the preparation method comprises the following steps: S1, weighing raw materials according to the mass percentage; s2, raw material smelting; s3, rare earth purification is conducted, specifically, rare earth elements are added into the molten-state raw materials, and the molten-state raw materials are subjected to deoxidation and desulfurization treatment; s4, casting molding is conducted, the temperature from the bottom end of a casting to a riser is controlled to be decreased stage by stage, and directional solidification is achieved; s5, heat treatment is conducted, specifically, the casting is subjected to solution treatment and then subjected to water quenching to the room temperature; and S6, surface treatment is conducted, specifically, shot blasting treatment is adopted, surface oxide skin is removed, and a surface compressive stress layer is formed. The strength, hardness and high toughness of the high-manganese steel are guaranteed by controlling the content of carbon and manganese, meanwhile, single-phase austenite is obtained through solution treatment, the hardness is improved through carbon atom segregation through low-temperature aging, and the strength, hardness, toughness and corrosion resistance of the high-manganese steel lining plate are improved.

The embodiment of the invention provides a manufacturing method of a light alloy structural part of a complex structure. The manufacturing method comprises the steps that the light alloy structure is divided according to a simple body and a complex structure part; a simple main body is manufactured by adopting a casting molding, pressure processing molding or stirring friction solid-phase additive molding technology; and preparing a complex structure part on the prepared simple main body by adopting an additive manufacturing technology. According to the method, the problem that the mechanical property, the structural complexity and the machining cost of a light alloy structural part of a complex structure are difficult to consider in the preparation process is remarkably solved.

The application provides a cast power end frame including a pair of end plates and an outer casing extending between the end plates and defining an interior therein; a crank shaft housing extending between the end plates and within the interior of the outer casing, and a plurality of crosshead tubes, each crosshead tube extending substantially perpendicular to the crank shaft housing, wherein the outer casing, crank shaft housing, and crosshead tubes are cast as a single part comprising steel comprising a carbon constituent of 0.06%-1.99% carbon.

The invention discloses tin-lead bronze and a preparation method and application thereof.The tin-lead bronze comprises, by weight, 5%-11% of Sn, 2%-6% of Pb, 0.09%-4% of Ni, 0.05%-0.3% of P, 0.01%-1% of Zn and the balance Cu and inevitable impurities, the alloy structure of the tin-lead bronze comprises an alpha phase, an alpha + delta eutectoid and elemental Pb particles dispersed and distributed in the alpha phase, the area ratio of the alpha + delta eutectoid is smaller than or equal to 12%, and the area ratio of the elemental Pb particles is smaller than or equal to 10%. The as-cast average grain size of the tin-lead bronze is 20-70 microns, and the difference value delta D between the minimum grain size and the maximum grain size is smaller than or equal to 20 microns. Through improved design of alloy components and microstructures, a cast ingot with a specified structure is obtained by adopting a centrifugal casting process, meanwhile, the problem of dendritic segregation existing in a traditional casting method is solved, and the prepared material meets high requirements of special industries such as aerospace, ships and large engineering machinery.

The invention discloses a preparation method of a TiAl alloy casting containing return scraps, the TiAl alloy return scraps used in the preparation method are casting sprues, patches and skull which are cut off in subsequent processing, and the preparation method comprises the following specific implementation steps: carrying out ultrasonic cleaning and surface treatment on the return scraps to remove a surface oxide layer; a new material with the target weight of 50% is used for smelting during primary smelting to obtain a primary ingot, a return material is placed below the turned primary ingot before secondary smelting, and then the primary ingot is smelted and poured into a preheated mold to form a casting, so that recycling of a TiAl alloy raw material is realized, the raw material cost is reduced by 50%, the preparation cost is reduced by 33%, and the production efficiency is improved. And the power consumption and the equipment loss are reduced, so that the purposes of energy conservation and emission reduction are achieved. The impurity element control of the cast ingot produced by the method is equivalent to that of alloy produced by conventional raw materials, and is convenient and fast compared with a preparation process by directly utilizing the raw materials. And the poured casting is uniform in component, compact in structure and high in purity.