62results about How to "Reduce shrinkage porosity" patented technology

The invention discloses an electromagnetic current coupling field assisted hybrid melting-brazing method for a laser-TIG arc and equipment. In addition to the use of the welding zone, an alternating magnetic field is added to control properties of plasma formed through ionization of laser, arc and a raw material metal, thereby improving the laser utilization rate. Under the electric field assisted comprehensive effect, the weld melting depth is increased, and the assistant effect on the melting bath of the liquid-state brazing filler metal for laser-arc melting-brazing is realized through electromagnetic stirring and excitation and enhancement, thereby promoting the orderly flow of the liquid-state brazing filler metal and the rupture, wetting, spreading and proliferation of the liquid-state brazing filler metal on the surface of the high metal material, improving the full mixing of the liquid-state brazing filler metal and the base metal formed by melting the low-melting-point metal material, improving the uniformity of the components of the brazed weld, stabilizing the welding process, reducing welding defects, increasing the welding speed, improving the weld formation, optimizing the structure and performance of the brazed weld, and improving the quality of the brazed joint. Moreover, the equipment has the advantages of simple structure, flexible application, low cost, good effect and easy realization.

The invention belongs to the technical field of 3D (Three-Dimensional) printing, and particularly relates to a method and a device for carrying out 3D printing and composite manufacturing on metal. The method for carrying out the 3D printing and the composite manufacturing on the metal comprises the following steps: S101, fusing metal powder under the action of an ultrasonic vibration energy fieldaccording to a preset 3D printing and filling scanning path, thus forming cladding layers of a workpiece; S102, simultaneously carrying out laser shock processing on the cladding layers under the action of the ultrasonic vibration energy field, and impacting and forging the cladding layers through ultrasonic vibration waves and shock waves induced by laser shock; S103, stacking the cladding layers layer by layer, thus obtaining the workpiece. Aiming at the problem existing when an existing metal 3D printing technology is used for manufacturing metal parts, the method disclosed by the invention has the advantages that internal defects of pores, poor fusion, shrinkage porosity and cracks of metal cladding layers and thermal stress can be removed to the maximum, the internal quality and themechanical dynamical comprehensive performance of the metal parts can be increased, and the problems of macroscopic deformation and cracking can be effectively controlled.

The invention discloses an electromagnetic excited TIG arc melting-brazing hybrid welding method and equipment. In addition to the use of the welding zone, an alternating magnetic field is added to control properties of a welding arc, and the assistant effect on the melting bath of the liquid-state brazing filler metal for arc melting-brazing is realized through electromagnetic stirring and excitation and enhancement, thereby promoting the orderly flow of the liquid-state brazing filler metal and the rupture, wetting, spreading and proliferation of the liquid-state brazing filler metal on the surface of the high metal material, improving the full mixing of the liquid-state brazing filler metal and the base metal formed by melting the low-melting-point metal material, improving the uniformity of the components of the brazed weld, reducing welding defects, increasing the welding speed, improving the weld formation, optimizing the structure and performance of the brazed weld, and improving the quality of the brazed joint. Moreover, the equipment has the advantages of simple structure, flexible application, low cost, good effect and easy realization.

The invention discloses a method and a device for performing electric magnetization resistance welding-braze welding compounding on dissimilar materials by assistance of an applied magnetic field. In the process of performing resistance welding-braze welding on the dissimilar metal material, a liquid solder is subjected to auxiliary electromagnetic stirring and ordered control, and the molten liquid solder is subjected to the reinforced booster action of electromagnetic stirring and electric magnetization by using an external applied alternating magnetic field which is generated by a magnet exciting coil in a welding area so as to promote directional flow of the liquid solder, and rupture of membranes, wetting, spreading and diffusion of the liquid solder on the surface of the metal material with a higher melting point, promote the liquid solder and a base metal which is molten by the metal material with a lower melting point to be mixed fully, promote interdiffusion of elements and compositions between the solder and the base metal and alloying between the two, improve uniformity of compositions of a soldered seam, reduce the weld defects, optimize the texture and the performance of the soldered seam, and improve the resistance soldered joint; and the device has the advantages of simple structure, flexible application, lower cost, good effect, and easy implementation.

The invention provides a precise casting method of tiles of a floating wall of a combustion chamber of an aeroengine. The precise casting method of the tiles of the floating wall of the combustion chamber of the aeroengine comprises the following steps of: designing and manufacturing a model, lining sands, dewaxing, sintering, installing a mold shell, charging materials, sealing a pressure regulating device tank body, vacuumizing, smelting, regulating the intensity of pressure in a tank body, pouring, discharging the pressure, and cooling. According to the invention, main casting technology parameters are simplified into control vacuum level, gases are prevented from entering liquid metal in an atom or molecule type, and the defects of air holes, oxidation mixing in castings are reduced; the speed is pressurized, the pressure and the time are dwelled, the mold filling process of metal liquids can be controlled effectively through regulating the pressure and the pressurization speed during the pouring process, the technology parameters are controlled well; the mold filling capability of metal liquids is improved; the turbulent flow and splashing during the mold filling process are reduced, and the mixture formation is reduced; the mold filling and condensation processes of metal liquids are controlled, each performance of castings is improved, and the processing cycle is shortened.

The invention discloses a casting system capable of eliminating detects of a ZG35 valve casting and a design method thereof. The casting system comprises risers, a gating system and a chilling block. The gating system adopts a step-type gating system and comprises a sprue cup, a straight gate, a bottom layer ingate and an upper layer ingate. The sprue cup is used for pouring of molten metal liquid and connected with the straight gate. The straight gate is connected with the bottom layer ingate and the upper layer ingate. The chilling block is arranged at a hot spot at the bottom of the casting. The risers comprise the top risers and the side riser. The top risers are arranged over a flange on the top of the casting, and the side riser is arranged on the side face of a flange at the bottom of the casting. According to the casting system, the defects of shrinkage, dispersed shrinkage and cracking of the ZG35 valve casting can be effectively eliminated, the rate of finished products is increased, and mechanical performance of the ZG35 valve casting is improved.

The invention discloses a low-pressure controllable mold filling and high-pressure solidifying molding casting device and casting method for a low pressure and low-pressure supercharged casting machine. The device comprises a casting mold, a metal melt ascending feed channel and a flow dividing cone capable of moving up and down; the flow dividing cone can plays a role in flow dividing guidance and filter net compaction on the metal melt in the ascending feed stage, the metal melt is stably subject to mold filling in a laminar flow manner, after mold filling is finished, the flow dividing conedescends to form a seal structure, a sprue bush and a metal melt inlet of a m old cavity are closed. The metal liquid is subject to high supercharging, and is solidified under the high pressure, defects of shrinkage porosity, slag inclusion and the like can be overcome, the shape of the flow dividing cone is optimized, and metal melt low-pressure controllable stable mold filling and high-pressuresolidifying molding are ensured. The device and method can be used for casting of shell, frame, and bucket castings, and compared with traditional low-pressure casting, the strength can be improved by 10 to 50%, and the extension rate can be improved by 30 to 90%.

The invention discloses a precipitation strengthening type high-temperature high-entropy alloy for in-situ precipitation of carbide and a preparation method thereof, and belongs to the field of high-entropy alloy preparation. According to the method, a raw material composed of Cr, Fe, Co, Ni, Nb and Cr3C2 is fully smelted and mixed in an inert atmosphere and then subjected to solid solution agingtreatment, and the atomic percent and the atomic number of all the elements meet the requirements of 24.5% to 24.75% of Cr, 24.5% to 24.75% of Fe, 24.5% to 24.75% of Co, 24.5% to 24.75% of Ni, 0.5% to1% of Nb and 0.5% to 1% of C, wherein the atomic numbers of Cr, Fe, Co and Ni satisfy Cr = Fe = Co = Ni, and the atomic numbers of Nb and C satisfy Nb = C. According to the prepared alloy, a large number of spherical NbC carbide particles are dispersedly distributed in crystal grains, and a small number of M23C6 carbides are distributed on a crystal boundary. The crystal grains and carbide precipitated phases of the alloy have high thermal stability at high temperature, and have good effects on high-temperature structure stability and high-temperature mechanical properties of the alloy.

The invention discloses a method and a device for performing electric magnetization resistance welding-braze welding compounding on dissimilar materials. In the process of performing arc welding-braze welding on the dissimilar metal material, a brazed liquid solder molten pool is subjected to the reinforced booster action of electromagnetic stirring and electric magnetization by using the characteristic that a magnet exciting coil generates an external applied alternating magnetic field in a welding area to control a welding arc so as to promote ordered flow of the liquid solder, and rupture of membranes, wetting, spreading and diffusion of the liquid solder on the surface of the metal material with a higher melting point, promote the liquid solder and a base metal which is molten by the metal material with a lower melting point to be mixed fully, improve uniformity of compositions of a soldered seam, reduce the weld defects, optimize the compositions and the performance of the soldered seam, and improve the soldered joint; and the device has the advantages of simple structure, flexible application, lower cost, good effect, and easy implementation.

The invention discloses a roll belt type thin-strip casting-rolling integrated machine and a using method thereof, and belongs to the field of steel casting. The roll belt type thin-strip cast-rollingintegrated machine comprises a tundish, a belt type conveying device, a continuous casting mechanism and a continuous rolling mechanism. The belt type conveying device comprises a conveying steel belt which is obliquely arranged. The tundish, the continuous casting mechanism and the continuous rolling mechanism are all arranged above the conveying steel belt and sequentially arranged from high tolow in the conveying direction of the conveying steel belt. The continuous casting mechanism comprises a water-cooled crystallization roller, and an anastomosis point is formed between the water-cooled crystallization roller and the surface of the conveying steel belt. The continuous rolling mechanism comprises a hot roll, and a rolling gap is formed between the hot roll and the surface of the conveying steel belt. According to the roll belt type thin-strip casting-rolling integrated machine and the using method thereof, casting and rolling are closely combined through process optimization and improvement, the arrangement is more compact, the space occupied by the production line is reduced, the thickness of the thin strip during casting and rolling can be controlled, the occurrence of aloose shrinkage cavity in the thin strip is reduced, and the production efficiency is improved.

The invention relates to an actuator box body casting process, which comprises the following steps: making a metal mold plate entering an actuator box body with metal, heating the metal mold plate to 180-280 C degree, coating molding sand on the metal mold plate, curing the molding sand, heating and curing the molding sand form a shell mold, wherein a pouring opening is formed in the central part of the shell mold, an overflow pipe and exhaust pins communicated with the cavity is arranged on the shell mold; forming three sets of actuator box body sand cores through chromite sand, combining the sand cores to form a sand core main body and horizontally arranging the sand core main body in a lower shell; making a sand box with sand, wherein upper and lower shells are embedded into the sand box, a sand layer is coated on the cavities among the inner side of the sand box and the outer surfaces of the upper and lower shells, and a pouring and rising system communicated with the shell mold is arranged in the sand layer; pouring towards the cavity through the pouring and rising system to form the actuator box body. The actuator box body casting process has the advantage that the exhaust is fast and the work efficiency is high.

The invention provides a method for setting a riser on a casting of a ship diesel engine body. The riser is arranged at a central line part between a bottom plate of the casting and a crankshaft, the riser and a riser neck are previously solidified on the casting, and the diameter of the riser and the diameter of the riser neck are calculated according to the modulus of the riser and the modulus of the riser neck. The method solves the problems that as a traditional technology adopts a casting method for compensating contraction by the riser and the riser neck, excessive molten iron is squeezed back to the riser when the casting enters a graphitization expansion period, and although the casting is prevented from a concentrated contracted hole under the gravity action of the molten metal column of the riser when secondary contraction occurs in a solidifying later period, micro contracted loosening among eutectic colonies cannot be overcome. According to the application, the riser and the riser neck are previously solidified on the casting, and pressure is built in the casting through the utilization of all or part of eutectic expansion quantity. The contraction self-compensation capability is improved, and contracted loosening flaws are reduced.

The invention discloses a casting device and casting method of low pressure controllable filling type and high pressure solidification molding capable of being used for differential pressure and differential pressure pressurizing casting machine. The device comprises a casting mold, a metal melt body liquid lifting channel and a shunt cone capable of moving up and down. The shunt cone plays functions of shunt guiding to a metal melt body and compacting on a filter net in the process of liquid lifting, so that the metal melt body is smoothly filled in a laminar flow mode. After filling type isfinished, the shunt cone moves downwards to form a sealing structure, and a metal melt body inlet of a pouring gate sleeve and a mold cavity is closed; then, a metal liquid is pressurized to solidifythe metal liquid under the high pressure, and the defects such as shrinkage porosity, and debris and slag inclusion are avoided; and meanwhile, the shape of the shunt cone is optimized and designed, and low pressure controllable stable filling type and high pressure solidification molding of the metal melt body are ensured. The casting device can be used for casting of casting pieces of shell type, frame type and bucket body type, compared with traditional differential pressure casting, the strength can be improved by 10-30%, and the elongation rate can be improved by 30-65%.

The invention relates to a circular blank continuous casting terminal electromagnetic stirring control system. The system comprises an industrial controller, a PLC, a frequency converter and an electromagnetic stirrer; the industrial controller and the PLC are communicated through a network; the data interaction is performed between the PLC and the frequency converter through a scene bus; and the frequency converter and the electromagnetic stirrer are connected through a control cable. As control parameters of the frequency converter for controlling the electromagnetic stirrer in the system are intelligently controlled, the high matching of the operation current curve of the electromagnetic stirrer and the ideal curve is realized, the problems of short effective time of electromagnetic stirring at terminal and influence on peak current are effectively solved, the higher effect on improvement of the internal quality of circular blanks is achieved, and the requirements on quality by a production process are satisfied.

The invention discloses a low-pressure controllable mold-filling and high-pressure solidification forming casting device capable of being used for a pressure adjusting casting machine and a pressure adjusting and pressurizing casting machine and a casting method. The low-pressure controllable mold-filling and high-pressure solidification forming casting device comprises a casting mold, a metal melt liquid-rising channel and a sprue spreader capable of moving up and down. The sprue spreader plays the roles of flow dividing guiding and compacting a filter net on metal melt at a liquid-rising stage, so that the metal melt is subjected to stable mold-filling in a laminar flow mode. After mold-filling is completed, the sprue spreader downwards moves to form a sealing structure, and metal melt inlets of a sprue bush and a mold cavity are sealed. Then a metal liquid is subjected to high pressurizing to be solidified under high pressure, so that the defects such as shrinkage cavity and porosity, and inclusions and slag inclusion are avoided. Meanwhile, the shape of the sprue spreader is subjected to optimal design, so that low-pressure controllable stable mold-filling and high-pressure solidification forming of the metal melt are ensured. The low-pressure controllable mold-filling and high-pressure solidification forming casting device capable of being used for the pressure adjusting casting machine and the pressure adjusting and pressurizing casting machine and the casting method can be used for casting of shell types, frame types and barrel types of casting pieces, and compared with traditional pressure adjusting casting, the strength can be improved by 10-40%, and the elongation rate can be increased by 30-80%.

The invention provides a tungsten-cobalt-nickel alloy and a preparation method and application thereof. The tungsten-cobalt-nickel alloy is prepared from the raw materials in percentage by mass: 30-45% of tungsten, 15-25% of cobalt and 30-55% of nickel. The preparation method of the tungsten-cobalt-nickel alloy comprises the steps: the raw materials of the tungsten-cobalt-nickel alloy are processed into an electrode ingot, and then the electrode ingot is treated to obtain a vacuum consumable electrode; and the vacuum consumable electrode is mounted into a consumable electrode vacuum furnace tobe smelted to obtain the tungsten-cobalt-nickel alloy. The tungsten-cobalt-nickel alloy is applied to weapon manufacturing. According to the tungsten-cobalt-nickel alloy provided by the invention, harmful gas elements such as oxygen, nitrogen and hydrogen and nonmetallic inclusions are deeply removed, meanwhile loose shrinkage holes in an as-cast alloy are further eliminated, solidification segregation is reduced, and purification and homogenization levels of the alloy are greatly improved.

The invention discloses a gating system for a cylinder cover of a single-cylinder air cooled engine. A blind riser communicated with a mold cavity is formed in the top of a gating mold of the cylinder cover of the engine, by adopting a top pouring slot-type gating system, a slot gate communicated with the mold cavity is arranged at the top of one end of the mold, a cross gate, a sprue and a pouring cup which are communicated are sequentially arranged on the slot gate; and an alumina ceramic tube which is communicated with the mold cavity and external atmosphere is arranged at the top of the other end, far away from the slot gate, of the mold. The gating system facilitates the removal of defects in the prior art, and the quality and finished percentage of castings can be improved.

The invention provides a casting mold for a high-temperature alloy cast ingot with the large height-diameter ratio and application. The casting mold comprises a hollow casting mold unit, an opening is formed in the upper end of the casting mold unit, the casting mold unit is sleeved with a riser unit, the riser unit is sequentially provided with a casting head layer and a heat preservation layer from inside to outside, and the casting mold unit is sequentially provided with a first section, a second section and a third section from top to bottom; and the inner walls of the first section, the second section and the third section are flush in the vertical direction, and the outer wall of the second section retracts inwards relative to the first section and the third section in the horizontal direction. The invention further provides application of the casting mold for the high-temperature alloy ingot with the large height-diameter ratio. According to the casting mold for the high-temperature alloy cast ingot with the large height-diameter ratio and the application, the shrinkage porosity in the center of a casting can be remarkably reduced, the cast ingot quality and the product yield are improved, large-scale production is easy, and no adverse effect is generated on the production efficiency.

The invention discloses a special cold iron sand core and a preparation method thereof. The special cold iron sand core comprises a sand core body, wherein the sand core body comprises a circumferential surface, a core head arranged at the upper end of the circumferential surface, and a core seat at the lower end, the circumferential surface of the sand core body is a conical surface with a smallupper end and a large lower end, the circumferential surface of the sand core body is uniformly provided with venting holes, and the center of the sand core body is provided with an venting passage penetrating through the core head and the core seat. The cold iron sand core replaces a resin sand core, thereby accelerating the cooling speed of a hot section of a ductile iron casting, reducing the defects of shrinkage porosity and pores at the hot section of the casting, and preventing the defects of gray spot sulfuration at an inner hole processing part of the ductile iron casting. The processis simple, the venting is convenient, and a product can be reused, thereby ensuring the quality of the casting and reducing the production cost.

The invention relates to the field of preparation of amorphous alloys, and particularly relates to an amorphous alloy component and a preparation method thereof. The method comprises the following steps: mixing metal raw materials based on design ratio, and alloying to obtain an amorphous master alloy; processing the amorphous master alloy into preset size; performing vacuum die casting on the amorphous master alloy; conditioning the melting temperature; setting pressing injecting speed and controlling the pressing injecting pressure to determine the vacuum die casting condition; and melting the amorphous master alloy and then pressing and injecting into a die under the vacuum die casting condition so as to obtain the amorphous alloy component; the yield of the amorphous alloy component isnot less than 90%; the strength is not less than 1500MPa; the surface smoothness is high; and defects are avoided. According to the method, a reasonable preparation process is determined by controlling the melting temperature, setting the pressing injecting speed, controlling the pressing injecting pressure and adjusting other technical parameter variables in the vacuum die casting process, and thus the filling property, the yield and the mechanical performance of the amorphous alloy component can be improved.

The invention relates to a gravity casting-liquid forging combined casting device and process. The casting device has three forms, the first form comprises a base, an upper die, a side die set, a fixed die, a moving die, a pouring cup, a plugging slide block, a plugging sliding groove, a pressurizing oil cylinder, a rack and a handle; the second form comprises a base, an upper die, a side die set,a movable die, a pouring cup, a plugging sliding block, a plugging sliding groove, a pressurizing oil cylinder, a positioning pin, a handle and a rack; and the third form comprises a base, an upper die set, a side die set, a plurality of movable dies, a pouring cup, a plugging sliding block, a plugging sliding groove, a plurality of pressurizing oil cylinders, a rack and a handle. According to the casting device and process, gravity casting and liquid forging are organically combined together, the pressure on liquid metal is increased through gravity casting equipment, so that the liquid metal is solidified under the pressure, the inherent quality of castings is remarkably improved, shrinkage porosity and shrinkage cavities are reduced, and the mechanical property is improved; and the device is simple in structure, low in cost and high in casting molding speed, and the production efficiency is remarkably improved.

The invention aims at providing an automobile punching die ductile iron drawing model face cooling tool. The bottom of a profile is provided with a cooling pipeline matched with the profile in shape.In the cooling pipeline, a plurality of straight steel pipes and bent steel pipes are connected and combined through connection sleeves to form the shape matched with the profile. An inlet pipe of thecooling pipeline is fixed to a middle box through an inlet pipe connector, and an outlet pipe is fixed to the middle box through an outlet pipe connector. Then, an air inlet and an air extraction port are used for air inflow and air outflow. Air extraction cooling is conducted on the concave corner part of the profile, and accordingly, thermal joint part moulding sand cooling is effectively accelerated. Air is utilized for conducting air cooling on local moulding sand at the profile position, and accordingly the problem of shrinkage porosity and cavities of the part is solved.

The invention relates to the technical field of motor housing casting, and discloses a squeeze casting method for an aluminum alloy motor housing. The indirect squeeze casting process is adopted to achieve the best casting effect by controlling the process conditions. The influence of pouring temperature and mold temperature on the internal and external quality, density, structure, mechanical properties and air tightness of motor casing castings reduces shrinkage porosity, round grain structure, and excellent mechanical properties. The prepared motor casing The body has high dimensional accuracy, no cracks, cold insulation and shrinkage on the surface, the compressive strength is greater than 240MPa, the elongation is greater than 1.0%, and the hardness is greater than 80HBW.

The invention relates to a casting method based on a novel oil pump body shell mould. The casting method comprises the following steps that (1) heating and solidifying are conducted on molding sand to form the shell mould, the shell mould consists of an upper shell body and a lower shell body, and after mould clamping is conducted on the upper shell body and the lower shell body, an oil pump body mould cavity is formed; (2) a set of sand cores of an oil pump body is formed through chromite sand, the sand cores are correspondingly an inner sand core and an outer sand core, the sand cores are combined to form a sand core main body, and the sand core main body is horizontally arranged in the lower shell body; (3) a sand box is manufactured through sand, the upper shell body and the lower shell body are embedded in the sand box, a sand layer covers a cavity between the outer surfaces of the upper shell body and the lower shell body and the inner side of the sand box , and the sand layer is internally provided with a gating and risering system which communicates with the shell mould; and (4) casting is conducted on the interior of the mould cavity through the gating and risering system, and the oil pump body is formed. The casting method has the advantages that through the casting method, burrs of parting mould surfaces of the oil pump body are easy to polish, and sand core fracture in the casting process is not easily caused.

The invention discloses a device and method for preparing large cast ingot through slag protection based multi-layer casting magnetic field current compound treatment. The device comprises a steel ingot mould, a dead head, a slag ladle and a tundish, wherein movable type parallel electrodes and a movable type magnetic field coil are further separately arranged on the upper part of the steel ingotmould; during casting, amount of needed molten steel is firstly determined according to the specification of the large cast ingot, and the amount of the molten steel is divided into a plurality of parts according to the property of easily segregating elements in the molten steel; content of elements which are easily segregated in each part is regulated, so that casting powder is added before the first part of the molten steel is cast, tapping in a slag layer is guaranteed, and impurities are adsorbed; under action of magnetic fields and / or current, the next part of the molten steel is added while the first part of the molten steel is gradually solidified till a molten pool is relatively small, and protective slag is supplemented till all of the molten steel is cast to prepare the cast ingot. The casting method disclosed by the invention can purify the molten steel, relieves and even eliminates gross segregation, and alleviates shrinkage cavity and porosity.

The invention relates to a local pressurization mechanism and a method for producing automobile engine suspension shock insulators by the same. The method solves the problems that an existing method for producing suspension shock insulators of four-wheel-driven automobiles is complex in process and long in producing period, and produced products are poor in internal quality, low in internal and surface hardness and poor in mechanical property. The scheme of the local pressurization mechanism includes that a transmission rod of an oil cylinder is connected with one end of a local pressurization pin through a connection sleeve, the other end of the local pressurization pin is mounted in an ejector sleeve and contacts with a pouring tail end of a part to be processed, and the ejector sleeve is in butt joint with the part to be processed. The method for producing the automobile engine suspension shock insulators by the local pressurization mechanism includes the steps: designing and molding a mould; smelting aluminum alloy; squeeze casting; progressively solidifying the part by smoothly cooling the mould by the aid of the oil cylinder during squeeze casting; and after the part is completely solidified, taking out the molded shock insulator for natural cooling to obtain a finished product. The local pressurization mechanism and the method for producing the automobile engine suspension shock insulators by the same are utilized to produce the suspension shock insulators of the four-wheel-driven automobiles.

The medium-hole feeding process for the thick and large part of the turbine chamber of the turbine shell casting includes a sand core set in the mold corresponding to the turbine chamber to be cast. One end of the shrinkage channel extends to the position connected to the thick part to be cast in the turbine chamber, and the other end of the feed channel extends to the outside of the flange port where the turbine casing casting to be cast and the intermediate body are connected. A riser is provided outside the port corresponding to the feeding channel. This medium hole feeding process improves the feeding efficiency of the riser and reduces the shrinkage porosity in the thick and large parts of the turbine casing casting, thereby improving the product quality of the casting, improving the performance of the turbine casing, and extending the life of the turbine casing. service life.

The disclosure relates to a platinum alloy comprising (a) 47.5 to 54.99 wt.% of platinum, (b) 1.5 to 10 wt.% of cobalt, and (c) 35.01 to 51 wt.% of copper. The platinum alloys have excellent mechanical and optical properties for use in the production of ornamental articles such as rings, necklaces, earrings, watch bands, watch bodies and other jewelry. The disclosure further relates to a method of preparing the platinum alloys and their use in the production of ornamental articles. Still further the disclosure relates to ornamental articles comprising the platinum alloy and a method of production thereof.

The present invention relates to the technical field of integrated metal containers for storage and transportation of spent fuel, in particular to a molding process method for metal containers for integrated storage and transportation of 100-ton spent fuel and combined casting molds for iron sand, especially for integrated storage and transportation of 100-ton spent fuel The casting method of the metal container and the used iron-sand combined casting mold. The iron mold is made of nodular cast iron. The outer mold is composed of multiple parts and a cover mold. The large core is a sand skeleton and chilled iron. The chilled iron is embedded in the molding sand. The bottom molding sand is made of furan resin sand. Casting, this process has formulated special process parameters and process methods, using the pouring system and filtration system to separate the primary oxidation slag in the cast iron liquid, and reduce the chemical reaction between the cast iron liquid, air and the mold, reduce the secondary oxidation slag, and make the casting During the solidification process, the graphitization expansion fully offsets the liquid shrinkage and solidification shrinkage, and eliminates shrinkage cavities and shrinkage porosity.