421 results about "Lost-foam casting" patented technology

The invention relates to an evanescent mode casting production line, and belongs to the technical field of casting, the evanescent mode casting production line comprises a molding conveying line and a plurality of pouring conveying lines which are arranged side by side, one ends of the molding conveying line and the plurality of pouring conveying lines are provided with the same first conveying track, and the other ends are provided with the same second conveying track; a first transfer trolley is slidably arranged on the first conveying track in the length direction of the first conveying track, a second transfer trolley is slidably arranged on the second conveying track in the length direction of the second conveying track, a box turning station, a bottom sand station, a part loading station, a sand filling station and a facing sand station are sequentially arranged on the molding conveying line, and a pouring station is arranged on the pouring conveying line. A first pushing piece used for pushing the sand box to the molding conveying line from the first transfer trolley is arranged on the side, away from the molding conveying line, of the first conveying track, and a second pushing piece used for pushing the sand box to the pouring conveying line from the second transfer trolley is arranged on the second transfer trolley. The production efficiency of the casting production line can be improved.

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 belongs to the technical field of casting machining, and particularly relates to lost foam casting equipment which comprises a sand box, supports are arranged on the two sides of the sand box, a plurality of U-shaped holes are formed in the inner bottom wall of the sand box, isolation frames are inserted into the U-shaped holes, butt joint plates are arranged at vertical openings of the isolation frames, and the butt joint plates are connected with the supports through bolts. The bottom end of the butt joint plate is fixedly connected to the inner bottom wall of the sand box; the isolation frame is matched with the butt joint plate to form an isolation area in the sand box; a fixing plate is arranged below the sand box, and a first hydraulic cylinder is arranged at the top end of the fixing plate and located below the isolation frame; according to the lost foam casting equipment, the isolation frame is arranged, and the isolation frame is matched with the butt joint plate to form an isolation area in the sand box during use, so that all sand in the sand box does not need to be taken out and added in the process of placing a lost foam and taking out a casting; the operation complexity of casting operation is reduced; the casting efficiency is improved.

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 utility model discloses an evanescent mode casting drying device, which relates to the technical field of drying equipment, and comprises a drying box, a drying main machine and a circulating fan blade, a horizontal partition plate is arranged in the drying box, and three conveying bodies are sequentially arranged in the drying box from top to bottom. The three conveying bodies can automatically convey the lost foam into the drying box and can also convey the dried lost foam out of the drying box, compared with an existing manual conveying mode, the lost foam drying device is more labor-saving and more convenient to operate, the vertical partition plate is arranged, air inlet holes are formed in the surface of the vertical partition plate, and therefore the lost foam drying device is more convenient to use. And hot air conveyed into the hot air cavity by the drying main machine can enter the drying cavity from three directions of the drying cavity through the air inlet holes in the vertical partition plate, so that the evanescent mode can be dried from multiple directions, the evanescent mode is dried more uniformly, and the drying effect is better.

The invention relates to a preparation method of biphase hard nanoparticle reinforced nodular cast iron applied to lost foam casting. The preparation method comprises the following steps: (1) a synchronous chemical preparation process of TiC-TiB2 biphase hard nanoparticles; and (2) preparing the reinforced nodular cast iron containing the double-phase hard nanoparticles by using an evanescent mode casting process. The preparation method has the advantages that the preparation process is simple, casting equipment and the process are not changed, nano-particles are uniformly dispersed and the like, and the mechanical property and the wear resistance of the obtained nano-particle reinforced nodular cast iron are obviously improved; tiC-TiB2 double-phase hard nanoparticles are added into an evanescent mode model, in the casting process, the nanoparticles gradually enter molten iron along with melting of the model, the nucleation rate of a primary structure of nodular cast iron is effectively increased, grains are refined, and the obdurability of a matrix is improved; the nano-particle reinforced nodular cast iron can be widely applied to the fields of automobiles, mining equipment, ships, infrastructure construction and the like.

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 present invention belongs to the technical field of lost foam casting, and specifically discloses a lost foam casting mold, comprising a first sand box, wherein the bottom of the first sand box is fixedly connected to a base, and both sides of the inner wall of the first sand box are provided with evenly distributed second sand outlets, and both sides of the outer wall of the first sand box are slidably connected to closed doors, and the closed doors block the second sand outlets, and both sides of the inner wall of the first sand box are slidably connected to reciprocating plates, and one side of the outer wall of the reciprocating plate is fixedly connected to evenly distributed compacting plates. In the present invention, by arranging structures such as compacting plates and warping edges, the quartz sand inside the first sand box can be shaped and lifted to prevent it from sinking downward quickly after the second sand outlet is opened, and at the same time, it can also block the quartz sand in the middle, limit the flow speed of the quartz sand, facilitate operators to guide and collect it in an orderly manner in a safe environment, and ensure that the casting is not affected by it.

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.

The invention provides an evanescent mode casting sand treatment method, belongs to the technical field of evanescent mode sand treatment, and overcomes the technical defect that the existing sand treatment speed is slow, the treatment method comprises the following steps: casting sand is layered through vibration of a vibrating screen, and large-particle materials enter a material barrel through an upper-layer screen of the vibrating screen; box burying sand and fine dust enter a sand suction hopper; a negative pressure area is formed through an inverted cone space in the cyclone processor and a cylindrical sand suction barrel which is inversely buckled at the upper part, and sand and fine dust are cooled and separated under the action of cyclone and then are discharged from different paths respectively; according to the method, through the cyclone processor and the sand suction barrel, not only can the mold sand be cooled, but also sand grains and sand ash can be separated, and the working efficiency of evanescent mold sand treatment is improved; cold air is sucked in a plurality of pipelines communicated with the upper surface in a conical hopper in the cyclone processor, so that the cooling effect is further improved; the scattered sand can be further cooled through flowing of air of the bucket elevator.

The utility model discloses a cooling machine for lost foam casting capable of efficiently and uniformly cooling, which comprises a shell, a feed inlet is arranged on the upper surface of the shell, the cooling machine further comprises a material distributing pipe, the material distributing pipe is mounted at the lower end of the feed inlet, and an air cooling structure is arranged in the shell. The air cooling structure can slow down the descending speed of materials and enable the materials to descend evenly through cooperation of an inclined plate and a material guiding plate, the air cooling structure comprises the inclined plate, the inclined plate is installed on the outer surface of a ventilation pipe, the upper end of the ventilation pipe is connected with a material distributing pipe, and a plurality of air caps are installed on the outer surface of the inclined plate. A material guiding plate is correspondingly arranged below the inclined plate and installed on the surface of the inner wall of the shell. According to the efficient and uniform cooling type cooling machine for lost foam casting, the air cooling structure is arranged, materials are uniformly blown by airflow on the inclined plate, cooling is uniform, the water cooling structure is further arranged, the materials make contact with cooling liquid through the spiral pipe, and cooling is faster.

The utility model provides a lost foam casting hammerhead which comprises a hammerhead casting box, a lifting mechanism facilitating discharging of the hammerhead is arranged on the inner side of the hammerhead casting box, the lifting mechanism comprises hydraulic cylinders, an L-shaped lifting plate, a bottom plate and a leakage groove, and the hydraulic cylinders are symmetrically arranged in the middles of the two sides of the hammerhead casting box. The end of an output shaft of the hydraulic cylinder is fixedly connected with the top end of an L-shaped lifting plate, the bottom of the L-shaped lifting plate is fixedly installed on the two sides of a bottom plate, the bottom plate is arranged at the bottom of the inner side of the hammer head casting box, and a plurality of leakage grooves are formed in the bottom plate at equal intervals. According to the hammer head lifting device, a hammer head which is cooled and formed in the hammer head casting box can be lifted and exposed from the hammer head casting box without being dug out from quartz sand, so that a worker can conveniently discharge the hammer head, and the working efficiency is improved.

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 discloses an electromagnetic auxiliary pressurization aluminum alloy lost foam casting forming device and method.The device comprises an electromagnetic pressurization module and a lifting device module, a liftable electromagnetic coil is placed outside a sand box, during pouring, three-phase alternating current is supplied to the electromagnetic coil, a coil winding generates a traveling wave magnetic field, and the electromagnetic pressurization module is connected with the lifting device module; molten aluminum generates induced current under the action of a traveling wave magnetic field, the electrified molten aluminum cuts magnetic induction lines in the pouring process to generate downward constant magnetic field force, flowing of aluminum alloy melt micelles in a cavity is greatly promoted, mold filling power is improved, the pouring speed is increased, mold filling is complete, the structure is refined and compact, pouring defects are greatly reduced, and the mechanical property of a casting is improved. After pouring is completed, the electromagnetic pressurization module is lifted under the action of the lifting device module, the sand box is transferred to a sand shakeout area for next technological operation, and the working efficiency is improved; the invention further provides an electromagnetic auxiliary pressurizing aluminum alloy lost foam casting forming method so as to reduce the casting defects of aluminum alloy castings and improve the mechanical property of the castings.

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 molding machines, in particular to an aluminum alloy casting sand core molding machine which comprises a sand feeding mechanism. Four stations are arranged around the circumference of the manipulator mechanism, a plurality of screw rods are arranged on the box cover in a penetrating manner, the plurality of screw rods are in threaded connection with a threaded hole seat in the sand box, the sand feeding pipe and the exhaust pipe are vertically mounted on the mounting frame, and the screw rods are in threaded connection with the threaded hole seat in the sand box; a sand feeding machine of the sand feeding mechanism is connected with a sand feeding pipe through a pipeline, an air extractor is connected with an air extraction pipe through a pipeline, and a plurality of first tightening machines are installed on an installation frame and used for tightening a plurality of screws to press a box cover into a sand box. The manipulator mechanism clamps the sand box from the first station, sequentially passes through the second station and the third station, turns over the sand box to be upright and then places the sand box on the fourth station; the device is used for pumping air while filling quartz sand, improves the quality of casting parts, is suitable for lost foam casting, and is good in practicability.