295 results about "Lost-foam casting" patented technology

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 relates to the technical field of evanescent mode casting, and discloses a multi-cylinder diesel engine cylinder evanescent mode casting sand box which comprises a sand box body, a positioning frame is fixedly connected to the surface of the sand box body, a supporting rod is fixedly connected to the top of the positioning frame, a telescopic frame is fixedly connected to the bottom of the sand box body, and a motor is fixedly connected to the bottom of the inner wall of the telescopic frame. The positioning component comprises a bearing plate, and the surface of the bearing plate is in contact with the inner wall of the sand box. The positioning part is arranged in the sand box, the motor is started to drive the positioning part to start working, the positioning part can push a foam plastic mold into the sand box, the foam plastic mold is extruded and positioned in the downward moving process, and the stability of the foam plastic mold during installation is improved; and meanwhile, the positioning component can push the vibration component to start working when moving, vibration generated by the vibration component can be transmitted to the interior of the sand box, and gravel in the sand box can be continuously flattened through vibration.

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 lost foam casting, in particular to a lost foam composite coating, the lost foam composite coating takes a refractory material of an investment casting regenerated shell membrane as a refractory aggregate, the refractory aggregate comprises mullite and a mixture containing an inorganic preservative A and a sintering stripping material B, and one or more of quartz powder and graphite are selected. In the invention, an efficient anti-corrosion additive with sintering stripping is researched and developed as a refractory material auxiliary additive, and meanwhile, low-price refractory materials such as regenerated mullite and recycled quartz powder are utilized to form the lost foam coating aggregate, so that the selection of traditional refractory aggregate is broken through, and the reutilization of waste resources is realized; the environment pollution is reduced while the raw material cost is reduced, meanwhile, the aggregate performance is optimized by adding the raw materials such as calcium oxide and iron oxide red, and the comprehensive performance such as air permeability, suspension stability, high-temperature strength and toughness of the coating is remarkably improved through reasonable matching of the composite binder.

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.

The invention discloses an evanescent mode casting positioning device capable of controlling the size A. The evanescent mode casting positioning device comprises a mounting seat, the top of the mounting seat is provided with an adaptive mechanism for assisting mounting, and the mounting seat is internally provided with a positioning mechanism for positioning the die body; through cooperative arrangement of the adaptation mechanism, the positioning mechanism and the inner clamping mechanism, positioning is not limited by the density of foam any more, clamping jaws on the two sides of the A-size tool are opened to make contact with a white mold, negative pressure is generated through a vacuum pump, the white mold is adsorbed to the clamping jaws, then the A-size white mold is pulled back to a standard position, and positioning is achieved. The device is more accurate and stable, operation is more convenient, time is saved, according to cooperation between the adaptation mechanism and the positioning mechanism, positioning work of the placed white mold can be achieved, the inner clamping mechanism can clamp the white mold inwards from the inner side wall, the white mold can be driven to be pulled back to the preset position in a pneumatic negative pressure adsorption mode, and the labor intensity of workers is lowered. Therefore, the accuracy is ensured.

The invention relates to a jolt ramming table for lost foam casting, and belongs to the technical field of lost foam casting, the jolt ramming table comprises a jolt ramming table body, a limiting mechanism for limiting a sand box is arranged on the jolt ramming table body, and side striking mechanisms for striking the two sides of the sand box are arranged on the two sides of the jolt ramming table body; the side-striking mechanism comprises a vertically-arranged main rod, a plurality of side-striking components are arranged on the inner side of the main rod, and a driving module for driving the main rod to move close to or away from the sand box in a reciprocating mode is arranged on the compaction table body. The driving module drives the main rod to move close to or away from the sand box in a reciprocating mode, so that the side striking component collides the side wall of the sand box back and forth, the sand box further generates vibration in the side direction, then molding sand in the sand box is further vibrated and compacted, and the compaction effect is improved.

The invention relates to the technical field of casting devices, and particularly discloses a pump valve casting casting demolding device which comprises a recycling box, a cross beam is fixedly arranged on the recycling box, the cross beam is close to the middle, a bearing structure is fixedly arranged on the cross beam, and a limiting structure is fixedly arranged on the bearing structure. A loading unit is detachably mounted on the bearing structure, the loading unit is fixed through a limiting structure, and a separating structure is detachably mounted on the limiting structure. Through the sealing fit design of the loading unit and the precise pushing design of the separating structure, molding sand is automatically scattered and recycled after the box bottom and the pouring jacket are separated; the casting is stably moved out through directional pushing of the push plate, and the problem that the casting is difficult to take out in the lost foam casting process is thoroughly solved.

An evanescent mode drying device for casting part production comprises a drying chamber, multiple layers of goods shelves are arranged in the drying chamber, a module feeding assembly is further arranged in the drying chamber, one side of the drying chamber is connected with a drying assembly, and the module feeding assembly comprises an X-axis lead screw mechanism, a Z-axis lead screw mechanism, an electric cylinder and a pneumatic adsorption mechanism; according to the device, automatic batch storage and drying work of the modules can be achieved, manual feeding and discharging of workers are not needed, the working efficiency of production operation of the lost foam castings can be effectively improved, and meanwhile the labor intensity of the workers is reduced.

The utility model provides an air energy drying room for an evanescent mode, and relates to the technical field of drying equipment. The drying room comprises a drying room body, a movable carrier, a heating device and a soaking assembly, the evanescent mode can be placed on the movable carrier, a passing door allowing the movable carrier to pass through is arranged on the wall of one side of the drying room body, and the heating device is arranged on the inner wall face of the wall of the other side of the drying room body; the soaking assembly comprises a soaking pipe and an air inducing device, an air inlet and an air outlet are formed in the heating device, the soaking pipe is arranged at the junction of the inner wall face of the drying room body and the ground, one end of the soaking pipe is connected with the air outlet, the other end of the soaking pipe is closed, and a plurality of soaking holes are formed in a pipe body of the soaking pipe in the length direction of the soaking pipe. The air inducing device is connected with the soaking pipe, and air in the drying room body can sequentially pass through the air inlet and the air outlet to be sucked into the soaking pipe by the air inducing device and is exhausted out of the soaking pipe from the soaking holes. The lost foam drying device has the effect that the drying efficiency of lost foam in the same batch is high.

The invention discloses an evanescent mode casting device for metal processing, which belongs to the technical field of metal casting and comprises a conveying mechanism for conveying a mold, and the conveying mechanism is provided with a casting mechanism for pouring molten metal into the mold and an injection mechanism for injecting molding sand into the mold. The conveying mechanism can convey the lower mold and drive the lower mold to circulate among actions of loading into the lost foam, injecting molding sand, casting and pouring out of the lost foam and the molding sand, so that full-automatic lost foam casting operation is realized, and the continuity is good; according to the casting mechanism, when the upper mold plate is moved to the lower mold, the inserting pipe is driven to be inserted into the butt joint pipe at the same time, molten metal is conveniently cast into the lower mold, and the automation degree is high; when the upper mold plate and the lower mold are in butt joint, the sliding frame descends at the same time, the lowest evanescent mode is automatically placed in the lower mold through cooperation of the buckle module, the front column and the rear column, and automatic mold placing is achieved.

The utility model relates to the technical field of casting, in particular to a vacuum negative pressure device for lost foam casting. According to the technical scheme, the device comprises a mounting bottom plate, a vacuum pump is arranged above the mounting bottom plate, a pressure stabilizing assembly is arranged at the position, located on the mounting bottom plate, of the air inlet end of the vacuum pump, a filtering assembly is arranged on one side of the pressure stabilizing assembly, a negative pressure pipe is arranged on a connecting pipe, and a vacuum distribution mechanism is arranged at the end, away from the connecting pipe, of the negative pressure pipe. The filtering assembly adopts a multi-layer composite filtering structure, so that impurities in gas can be efficiently removed, meanwhile, the system pressure can be monitored and adjusted in real time through an intelligent central controller in the pressure stabilizing assembly, pressure fluctuation is effectively buffered, a stable negative pressure environment is provided for lost foam casting, and the production efficiency is improved. And meanwhile, the vacuum distribution mechanism is designed in a modularized mode, negative pressure distribution can be accurately controlled according to different production requirements, the air exhaust efficiency is improved, and the production efficiency of lost foam casting and the precision of castings can be improved.

The lost foam casting equipment comprises a functional box and a collecting box which communicate with each other, the collecting box is located below the functional box, a grid supporting plate is arranged between the collecting box and the functional box, and the collecting box is slidably connected with a base in the horizontal direction; a vibration assembly used for driving the collecting box and the functional box to reciprocate in the horizontal direction is arranged on the base, a first supporting plate used for containing a sand mold is arranged in the functional box, the first supporting plate is slidably connected with the functional box in the vertical direction, and a box plate is arranged on the box wall of the functional box. According to the lost foam casting equipment, the processes of mold placing, sand filling, pouring and sand shakeout of lost foam casting can be achieved, the first supporting plate and the box plate in the functional box can be combined to form a sand box, the sand box can implement the steps of mold placing, sand filling and sealing shaping, a sand mold is obtained, and after pouring is completed, the first supporting plate is separated from the box plate; and the sand mold on the first supporting plate can be moved to the bottom of the function box for vibration shakeout, and integrated casting is achieved.

The invention relates to the field of casting, and discloses an evanescent mode casting device for casting a motor shell. A quartz sand blasting mechanism; and the quartz sand blasting mechanism is arranged above the casting pool, and the quartz sand blasting mechanism is used for uniformly blasting sand and quartz sand into the casting pool and triggering air suction to enable the interior of the casting pool to be in a negative pressure state at the same time. The movement of the piston head causes the change of the internal volume of the piston pipe, gas is extracted from the negative pressure cavity through the exhaust pipe, so that the interior of the casting pool is in a negative pressure state, the one-way valve ensures that the gas can only enter the exhaust pipe from the negative pressure cavity, reverse flow is prevented, and the quartz sand blasting mechanism can uniformly blast sand into the casting pool. And air suction is triggered during sand blasting, so that the interior of the casting pool is in a negative pressure state, the sand blasting process and the negative pressure air exhaust process are synchronously carried out, and the finished product quality of motor shell casting is further improved.

The invention relates to the technical field of evanescent mode casting, and discloses an evanescent mode casting process which comprises the following steps: adopting a closed pouring system; setting a pouring temperature; a bottom pouring type pouring system is adopted; a furan resin self-hardening sand core is embedded in the part difficult to fill sand, after a process hole with the diameter smaller than or equal to 50 mm is formed, filling is conducted through an EPS block, sealing is conducted through a high-temperature-resistant adhesive tape, and compaction is assisted through vibration compaction equipment during sand filling; through multi-process collaborative optimization, a full-process controllable lost foam casting system is constructed, the casting density is improved compared with a traditional process, and the tensile strength is improved; the rejection rate is greatly reduced, and the production cycle is obviously shortened; and the dry sand recycling rate is high, and the comprehensive cost is reduced. According to the technical scheme, the problems of discontinuous mold filling, gas retention, dry sand collapse and the like in lost foam casting are solved, and a standardized solution is provided for industrial production of high-end castings.

The present application relates to the technical field of special functional coating materials for lost foam casting, and specifically discloses a special coating for large machine tool castings, and application and use method thereof. The present application synergistically strengthens full-temperature-range functional composite materials and composite aggregates, and uses mullite for high-temperature strengthening. Temperature-sensitive polymer modified graphite can realize intelligent temperature response of graphite performance. Lithium feldspar as a thermal expansion adaptive fluxing agent is more conducive to the medium-temperature healing and thermal expansion adjustment of the coating system. Composite reinforcing fibers are used to enhance and toughen the thick and large workpiece with large thermal stress. Boron-containing glazing agent as an ultralow-temperature glazing agent can form an initial liquid phase at about 450 DEG C, seal the surface of the coating, and purify the air passage. Rare earth oxides as high-temperature phase stabilizers can be solid-solved in the mullite lattice, improve the high-temperature phase stability, and refine the ceramic nodes. Through raw material design, the coating system has improved ultrahigh strength and crack resistance at extreme high temperatures under the premise of ensuring moderate air permeability.

The invention relates to the technical field of cable processing, in particular to metal casting evanescent mode casting equipment and a casting method.The metal casting evanescent mode casting equipment comprises a casting bin, a casting platform is fixedly connected to the bottom of the inner wall of the casting bin, the casting bin comprises a casting bin shell, and tempered sealing glass is fixedly connected to the front side and the rear side of the casting bin shell; second tempered sealing glass is fixedly connected to the top of the right side of the casting bin shell, a sealing door is rotatably connected to the bottom of the right side of the casting bin shell, a vacuum pump connecting frame is fixedly connected to the rear side of the right side of the top of the casting bin shell, and vacuum pumps are fixedly connected to the two sides of the inner side of the vacuum pump connecting frame correspondingly. By arranging the casting bin, the casting process is efficient, environmentally friendly and safe, it is ensured that the interior of the casting bin rapidly reaches the required vacuum state through efficient operation of the vacuum pumps, and a powerful guarantee is provided for high-quality production of casting parts.

The invention relates to the technical field of full mold casting, and provides a lost foam casting method for a thin lower mold insert type casting, which comprises the following steps of: firstly, processing a foam model, and carrying out quantity increasing, hole processing and connecting rib adding on the foam model to prevent the defects of deformation and shrinkage porosity of a shrinkage cavity; then the model is placed on an anti-deformation support which is provided with a check block and has the thickness of 50-100 mm, and deformation generated in the molding sand burying process is avoided; then a bottom pouring type pouring system is arranged, one inner pouring gate is arranged at the thin position of the model, the inner pouring gate keeps away from the drilling position, a straight pouring gate is arranged at the end, and it is guaranteed that molten iron is rapidly and stably filled into the model; then, CAE simulation is carried out, defects are eliminated, positions where shrinkage cavities and shrinkage porosity possibly occur are positioned, sand isolation chillers and inner chillers are arranged, the chilling effect is enhanced, and shrinkage cavities and shrinkage porosity are avoided; then carrying out shower coating operation, drying and then reinforcing; then modeling is conducted, and pouring is conducted after modeling; and then stress relief annealing is carried out, and finally shot blasting is carried out to remove redundant paste.

The invention relates to the technical field of lost foam casting, and particularly discloses a pouring device for gear box shell machining, which comprises a main body structure, a reversing structure and a mold fixing structure, the reversing structure is fixedly arranged on the main body structure, and the reversing structure is lifted and overturned through the main body structure; according to the full-automatic dip-coating machine, manual operation is replaced by mechanical linkage, reversing, overturning and downward pressing dip-coating of the lost foam are automatically completed, the manual overturning action is thoroughly replaced, the dip-coating efficiency of multiple die bodies in a single batch is improved, manpower and time are saved, the production efficiency is improved, the production cost is reduced, and the production efficiency is improved. Dip-coating surface omission or uneven coating thickness caused by different shapes of mold bodies and uneven manual force application damage caused by buoyancy influence are prevented, the device is adaptive to mold bodies and processes of multiple specifications, and the device can be compatible with evanescent molds of different sizes.

The invention discloses a special evanescent mode casting coating for castings and a preparation method thereof, and relates to the technical field of evanescent mode casting paints.The special evanescent mode casting coating for the castings is prepared from 80-86 parts of refractory aggregate, 5-7 parts of bio-based composite binder, 2.5-4 parts of composite suspension, 0.4-0.6 part of dispersing aid and 0.3-0.4 part of coupling agent. 6 to 12 parts of deionized water; the invention discloses a preparation method of a special lost foam casting coating for castings. The method comprises the following steps: S1, premixing dry materials; s2, preparing a liquid phase; s3, mixing and dispersing; s4, performing vacuum defoaming; s5, ultrasonic treatment; and S6, quality detection. According to the lost foam casting coating special for the casting and the preparation method of the lost foam casting coating, in the preparation process, bauxite, quartz powder and bauxite are matched according to the proportion of 9: 1 and then graded in a gradient mode according to the proportion of 3: 5: 2, the coating forms a double-layer structure with a compact surface layer and a porous inner layer through gradient grading, the surface layer is resistant to sand burning and molten metal scouring, and the inner layer rapidly exhausts steam; therefore, the requirements of sand adhesion prevention, ventilation and steam exhaust are met.

The invention relates to the technical field of lost foam casting and pouring, in particular to an integrated lost foam casting and pouring device and a working method thereof.The integrated lost foam casting and pouring device comprises a pouring mechanism, a mold mechanism is arranged on the front side of the pouring mechanism, the pouring mechanism comprises a pouring bottom frame, and a pouring control assembly is arranged on the rear side of the top of the pouring bottom frame; by arranging the pouring mechanism and the mold mechanism, automatic and precise control over the integrated lost foam casting pouring process is achieved, the mold body can be precisely controlled to enter and exit from the pouring area through starting and reverse movement of an electric push rod, errors and instability caused by manual operation are avoided, and meanwhile the production efficiency is improved. The injection angle of the pouring nozzle can be automatically adjusted according to the position of the mold body, it is ensured that molten metal can be accurately injected into the mold, the casting precision and quality are greatly improved, and in addition, the device has the advantages of being compact in structure, easy and convenient to operate, safe, reliable and the like.

The utility model relates to a molten metal uniform injection device for lost foam casting, which comprises a frame body, a box body and a hollow pipe, the box body and the hollow pipe are respectively fixed on the frame body up and down, a driving mechanism is arranged between the box body and the hollow pipe, a stirring component is arranged in the box body, and the stirring component is connected with the driving mechanism through a first transmission structure. A hollow pipe is arranged in the box body, a discharging assembly is arranged in the hollow pipe, and the discharging assembly is connected with the driving mechanism through a second transmission structure. Under the mutual cooperation of the driving mechanism and the first transmission structure, molten metal in the box body is fully mixed through the stirring assembly, and the quality of molten metal raw materials is ensured; and then the molten metal is guided into the hollow pipe through the liquid discharging pipe and the electromagnetic valve, and then the molten metal in the hollow pipe is evenly discharged through the discharging assembly by means of a second transmission structure matched with the driving mechanism.

This utility model relates to the field of lost foam casting technology and discloses a lost foam casting device for automotive drive axle housings. It includes a base, a frame mounted above the base, a casting box fixedly connected to the inner wall of the frame, a sand outlet on the lower surface of the casting box, a recovery assembly below the sand outlet, and a filter assembly outside the base. The recovery assembly includes a baffle, a collection box, and a sieve plate. A first hinge seat is fixedly connected to the outer wall of the frame, and a second hinge seat is fixedly connected to the outer wall of the baffle. A hydraulic rod is rotatably connected to the inner wall of the first hinge seat, and the output end of the hydraulic rod is rotatably connected to the inner wall of the second hinge seat. In this utility model, after casting is completed, the baffle is opened and closed automatically via a hydraulic drive device, achieving automatic opening and closing of the sand outlet. The molding sand falls into the collection box through the sieve plate for initial screening. Coarse sand is directly recycled, while fine sand is separated through the sieve plate, improving the efficiency of old sand recycling and reducing labor intensity.

This invention discloses a lost foam casting mold for gearbox housings, relating to the field of intelligent casting technology. It includes a lower mold and an upper mold. An ejector assembly is installed inside the lower mold, comprising a telescopic cylinder mounted inside the lower mold. A movable seat is mounted on the telescopic cylinder, and a top seat is connected to the movable seat via a conveying pipe. The top seat is located inside a recess in the housing, and its top horizontal plane is flush with the bottom horizontal plane of the bearing seat hole in the housing recess. The conveying pipe is connected to an external air pump via a first pipe, and a through hole is provided on the outer side of the top seat. In this lost foam casting mold for gearbox housings, when the top seat moves upward, it slowly lifts the housing upward, achieving initial loosening and separation of the housing from the bottom of the housing recess. Gas flows along the gap between the housing and the housing recess, assisting in loosening and preventing scratches on the housing surface during demolding, thus ensuring the appearance quality of the housing.

The application relates to the technical field of special functional coating materials for lost foam casting, and particularly discloses a cast iron lost foam and universal coating for full mold casting and application thereof. The cast iron lost foam and universal coating for full mold casting comprises quartz powder, calcined bauxite, modified fly ash microbeads, microcrystalline graphite and an additive; the modified fly ash microbeads comprise fly ash and a composite coating layer coated on the surface of the fly ash, and the composite coating layer comprises aluminum oxide nanosheets and magnesium ion doped amorphous substances. Through functional design of key components, the coating can dynamically adjust its performance according to the temperature and chemical environment of the contact interface, can meet the high air permeability requirement of the lost foam process, can take into account the differentiated requirements of different cast iron materials on high-temperature strength, permeability resistance and interface purity, and can be compatible with both conventional negative pressure and non-negative pressure conditions, so that the universal coating is realized, and production management and supply chain processes are greatly simplified.

The utility model discloses an accessory structure for reducing casting deformation of an evanescent mode, which belongs to the technical field of evanescent mode casting equipment, and comprises a white mold, a plurality of support rods are arranged in the white mold, and the support rods are arranged on the support rods. The two ends of the supporting rod are fixedly connected with the center points of the long edge and the short edge in the mold white mold correspondingly, supporting blocks are arranged at the four corners of the bottom of the mold white mold correspondingly, anti-deformation cushion blocks are arranged at the bottoms of the two sides of the mold white mold correspondingly, and the supporting rod and an inner frame of the mold white mold form a triangular stable structure. The cross section of the supporting rod is arranged to be in an inverted trapezoid shape with the wide upper portion and the narrow lower portion, an accessory structure composed of the supporting rod, a supporting block and an anti-deformation cushion block can be additionally arranged, casting deformation is reduced or controlled, and the problems that a side confining blank holder mold is prone to deformation in the lost foam casting process, and the machining allowance in the prior art is large are solved.

The invention discloses a casting forming method of a valve body with an inner surface alloy layer. A lost foam casting method is adopted for casting forming of the valve body. An alloy lining part capable of being matched with the inner surface of the valve body is prefabricated before casting forming, the alloy lining part is embedded in a foam model, and the outer surface of the alloy lining part and the inner surface of the foam model are attached to form an integrated casting model. In the casting forming process, molten steel can partially melt the outer surface of the alloy lining piece through high-temperature heat of the molten steel, so that the base metal of the valve body and the alloy lining piece are metallurgically bonded, the alloy layer which is approximately integrally formed is formed on the inner surface of the valve body in a cladding mode, the bonding strength between the alloy layer and the valve body is very high, and the service life of the valve body is prolonged. The inner cavity of the valve body has better wear resistance and corrosion resistance; construction does not need to be conducted in the inner cavity of the valve body, limitation of the structure of the inner cavity of the valve body is avoided, and due to the fact that the valve body and the alloy layer are produced in a combined mode, the production process can be effectively shortened, and energy consumption is reduced.

The application belongs to the technical field of bimetal castings, and discloses a device and method for magnetic field assisted lost foam casting of magnesium-aluminum bimetal castings. The device comprises a sand box, a cast foam pattern, a solid insert, a steady magnetic field coil, a rotating magnetic field coil and an alternating current power supply. The sand box is filled with dry sand, the cast foam pattern is arranged in the dry sand, the solid insert is embedded in the cast foam pattern, and the opposite ends of the solid insert are connected to the alternating current power supply. The steady magnetic field coil is sleeved outside the cast foam pattern, and the rotating magnetic field coil is sleeved outside the periphery of the steady magnetic field coil. The rotating magnetic field coil can produce electromagnetic stirring in the melt. The electromagnetic stirring can make the melt flow strongly, promote the migration and diffusion of high melting point precipitated phases in the melt, and thus improve the uniformity of the solidification structure of the magnesium-aluminum bimetal interface.

The invention relates to the field of evanescent mode casting, and provides an evanescent mode string casting process for plates, which comprises the following steps: firstly, manufacturing plate foam models, adhering flow gates to the plate foam models, and then connecting and stringing a plurality of plate foam models through foam strips to form a cage-shaped foam model; in this way, a plurality of plates can be formed at a time while the overall strength is enhanced, and model deformation in the curtain coating and modeling process can be conveniently controlled; the two rows of flow gates of the cage-shaped foam model are respectively connected with the two cross gates, and the two cross gates are communicated with the straight gate through the communicating channel, so that the whole body is poured through a pouring system; the cage-shaped foam model connected with the pouring system is subjected to shower coating and drying twice, then sand filling and vacuumizing are conducted, pouring forming is conducted, and finally the pouring system and the foam strips are removed; and by stringing the plates, the modeling efficiency and the process yield are improved, the production efficiency is improved on the premise that the production quality of the plates is guaranteed, and the production cost is reduced.

The utility model discloses sand airing equipment for an evanescent mode casting hammerhead in the field of sand airing equipment, which comprises mounting plates positioned on two sides and oppositely arranged, rotating rollers are rotationally mounted between two ends of the bottoms of opposite surfaces of the mounting plates, and a conveying belt is sleeved between the outer sides of the rotating rollers. A plurality of stop levers are fixed to one end of the lower surface of the fixing plate at intervals in the horizontal direction, a plurality of fixing cylinders are fixed to the middle of the upper surface of the fixing plate at intervals in the horizontal direction, and induced draft fans are installed in the fixing cylinders. According to the molding sand airing device, the working efficiency of sand airing of used molding sand can be guaranteed, the used molding sand is not influenced by weather when being aired, the occupied field space can be saved when the used molding sand is aired, and the molding sand can be aired conveniently.