404 results about "Sand casting" patented technology

The invention relates to the technical field of sand casting, in particular to a device and method for eliminating air holes in sand casting, comprising a mounting support, a bottom plate is arranged above the mounting support, a top plate is arranged above the bottom plate, and four ends of adjacent sides of the bottom plate and the top plate are fixedly connected with limiting frames; a round disc is fixedly connected to the center of the bottom of the bottom plate, and a spherical groove is formed in the bottom of the round disc; the mobility of molten metal in the cavity is improved through rotation of the mold, the molten metal can flow into a complex structure of the cavity, the cavity filling integrity is improved, it is guaranteed that gas in the molten metal has sufficient time to volatilize, and therefore generation of air holes is further reduced, and the product quality is improved. And as the pouring mold of the molten metal gradually returns in the inclined state, the molten metal is kept horizontal after pouring is completed, and the uniformity of mold filling of the cavity is guaranteed.

The utility model discloses an adjustable electric sand bath device which comprises a sand bath furnace, turnover mechanisms are arranged on the two sides in the sand bath furnace, a sand stacking mechanism is arranged in the middle in the sand bath furnace and comprises four lead screws, threaded blocks are arranged on the outer surfaces of the lead screws in a sleeved mode, an arc-shaped plate is arranged above the threaded blocks, and the arc-shaped plate is connected with the sand bath furnace. Arc-shaped bent plates are installed on the upper end faces of the arc-shaped plates, baffles are installed on one sides of the outer surfaces of the arc-shaped plates, heat conduction rods B are arranged on the opposite sides of the outer surfaces of the four arc-shaped plates, heat conduction rods A are arranged on the upper end faces of the heat conduction rods B, and heat conduction layers are arranged on the inner sides of the heat conduction rods A and the inner sides of the heat conduction rods B. The sand casting device has the advantages that sand casting can be carried out, so that sand is uniformly heated, samples at different liquid levels can be uniformly heated by arranging the sand stacking mechanism, and the applicability is improved.

The invention discloses a wear-resistant alloy casting part for electric machinery and a production process thereof, and relates to the technical field of electric casting part optimizing.The production process comprises the steps that raw materials are smelted to 1550-1620 DEG C under the protection of argon, and heat preservation is conducted for 30-60 minutes; composite modification treatment; performing low-pressure sand mold casting or die-casting molding; after a casting is austenitized for 1.5-3 hours at the temperature of 980-1050 DEG C, two-stage isothermal quenching is conducted in a salt bath, specifically, in the first stage, heat preservation is conducted for 15-25 minutes at the temperature of 280-320 DEG C, and in the second stage, heat preservation is conducted for 45-60 minutes at the temperature of 180-220 DEG C; and surface laser cladding is conducted, specifically, homogeneous alloy powder is adopted for conducting laser cladding with the lap joint rate being 35-50% on the working face of the casting part. The method has the beneficial effects that through the design principle of multi-scale cooperative strengthening and the cross-dimension coupling effect of material components, the process path and the microstructure, breakthrough improvement of the performance of the wear-resistant alloy casting is achieved.

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

The invention relates to the technical field of casting, in particular to vehicle gearbox casting equipment which comprises a support, a supporting plate used for placing a sand casting mold is fixedly connected to the support, a fixing mechanism used for fixing the sand casting mold is arranged above the supporting plate, and a driving mechanism is connected with a material guiding mechanism arranged on one side of the supporting plate. Through a rigid limiting structure of the square fixing frame and the supporting plate, impact of molten metal is resisted, displacement and collapse of a sand mold are avoided, inert gas is synchronously injected to stabilize the sand mold, the defects of sand holes and cold shut are reduced, the casting precision of key parts such as a gearbox bearing hole and an oil duct is improved, the inclusion and porosity are reduced, and the air tightness qualification rate of a shell is improved; the driving mechanism controls lifting, material pushing and vibration demolding in a linkage mode, the production period is shortened, the productivity is improved, the labor cost is reduced, meanwhile, molding sand can be recycled, emission is reduced, green manufacturing is met, and an efficient, high-quality and environment-friendly solution is provided for precise casting of the gearbox shell.

The invention discloses a sand recovery system of a precoated sand and iron sand mixed molding line, and particularly relates to the technical field of sand mold casting, the sand recovery system comprises a sand recovery device, a screening mechanism used for preliminarily screening mixed sand is arranged in a connecting frame, and a recovery mechanism used for recovering iron sand is arranged in a magnetic separator; a sorting mechanism used for recycling precoated sand is arranged on the surface of the sand recycling device, through the screening mechanism, the recycling mechanism and the sorting mechanism, large-particle sand in mixed sand can be separated out through a screen plate, then iron sand in the sand is separated out through a magnetic suction roller, and the precoated sand in the sand is separated out through an air blower. The precoated sand and the iron sand are added into the sand mixer, so that the precoated sand and the iron sand are mixed in proportion and then put into the molding line again for use, efficient recovery of the precoated sand and the iron sand is achieved, waste of the sand is reduced, and meanwhile energy consumption and equipment complexity in the sand recovery process are reduced by optimizing the sorting technology.

The invention discloses a shakeout treatment device used after sand mold casting forming, relates to the technical field of sand mold casting, and aims to solve the technical problems that traditional sand mold casting equipment is lack of crushing and screening before shakeout, large-particle sand is prone to blocking a casting part, the equipment is stuck and damaged, and the service life and safety are affected. Comprising a treatment barrel, a feeding port formed in the upper portion of the treatment barrel, an isolation plate located below the treatment barrel, a motor, a draught fan and a pressure valve, and the motor is located below the treatment barrel. According to the device, the secondary crushing assembly and the pressing assembly are designed, so that the device can accelerate discharge of sand and stones in a mode of synchronous cooperation of gas pushing and ground attraction force, the effect of guaranteeing the use safety and the machining quality of the device is achieved, and meanwhile, by means of multiple times of shakeout treatment, the machining efficiency is improved. And therefore, the situation that the shakeout is blocked in the alloy casting due to uneven shakeout volume during follow-up secondary utilization of the shakeout is reduced, and the effect of guaranteeing the machining quality of the alloy casting is achieved.

The present invention discloses molding sand additive packages, molding sand binder compositions comprising the molding sand additive packages, molding sand comprising the molding sand binder compositions, use of the molding sand and a method of sand casting.

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

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

The invention relates to the technical field of precoated sand casting, and discloses a precoated sand casting production line based on an intelligent casting island, the precoated sand casting production line comprises a machine body, a sand feeding pipe, a negative pressure sand suction pipe, a distance adjusting piece and a rotatable transmission shaft are respectively mounted in the machine body, and the distance adjusting piece is in transmission connection with two mold frames which are symmetrically arranged and have an adjustable distance; casting systems are arranged on the two mold frames, and each casting system comprises a toothed plate mounted on the machine body, a magnetic field generator mounted on the machine body, a casting frame capable of synchronously moving back and forth and left and right on the mold frames in a reciprocating manner, and a synchronous shaft capable of periodically and alternately rotating forwards and backwards. Technical breakthrough is achieved through the synergistic effect of the magnetic vibration coating and multi-mode vibration, Fe70Ga30 alloy nano-particles of the functional layer generate magnetic domain periodic orientation in an alternating magnetic field, micron-sized multi-axial vibration is excited, the surface of molding sand and a mold interface is deepened, intermolecular acting force is destroyed, deep-layer adhesive sand is stripped in a non-contact mode, and the surface of the mold is stripped in a non-contact mode. The problem that energy penetration of traditional impact type cleaning is insufficient is solved.

The utility model discloses a horizontal line casting mold for a combined sand core steering gear shell, which comprises a sprue base, a transverse pouring gate is connected with the sprue base in the transverse direction, four casting units are connected with the transverse pouring gate, and each casting unit comprises an auxiliary riser water inlet pressing edge and a main riser water inlet pressing edge which are connected with the transverse pouring gate. An auxiliary riser and a main riser are arranged at the tail end of the auxiliary riser water inlet pressing edge and the tail end of the main riser water inlet pressing edge respectively, a horizontally-arranged casting is arranged between the auxiliary riser and the main riser, a sand core is arranged in the casting, and a lower die main core head and an upper die main core head which are used for fixing and clamping are arranged under and over the exposed end of the sand core respectively. A first auxiliary core head and a second auxiliary core head which are used for auxiliary supporting are arranged on the two transverse sides of the casting correspondingly; according to the utility model, the one-mold four-piece steering gear shell is realized on a horizontal production line, the production efficiency is improved, the core setting stability is improved, and the beneficial effects of improving the casting quality and reducing the production cost are achieved.

The utility model discloses a waste sand recovery device of a swage sand-coated casting process, which comprises a conveying belt, the outer wall of the conveying belt is fixedly connected with a mounting plate, the top end of the mounting plate is fixedly connected with a first gear, the bottom end of the mounting plate is fixedly provided with a motor, and the output end of the motor penetrates through the mounting plate and is fixedly connected with a mounting seat. A screw rod is rotationally connected to the mounting base, a second gear is fixedly connected to the position, corresponding to the first gear, of the bottom end of the screw rod, a sliding groove is formed in the mounting base, clamping grooves are symmetrically formed in the mounting base, and a lifting plate is slidably connected to the interior of the sliding groove; the scrap iron sorting device has the advantages that the scrap iron sorting efficiency is high, a large amount of labor input is avoided, the labor cost is saved, the overall structure is simple, the manufacturing cost and the follow-up use cost are low, and the scrap iron sorting device is worthy of application and popularization.

The invention discloses a sand casting water-based coating and a preparation method thereof, and relates to the technical field of casting coatings. The preparation method of the sand casting water-based coating comprises the following steps: firstly, adding the refractory aggregate, the composite suspending agent, the nano aluminum oxide and the sodium lignin sulfonate into water, and uniformly stirring to obtain a premix; and then adding sodium carboxymethyl cellulose into the premix, and continuously stirring to obtain the sand casting water-based paint. The coating prepared by the invention has good suspension performance and fire resistance.

The invention belongs to the field of part manufacturing, and particularly relates to a molten metal purification method for sand mold casting, which comprises the following steps: S1, arranging a steel barrel piece between a pouring ladle and a casting mold for soft sealing, mounting a pressure-bearing pipeline on the steel barrel piece, and forming an angle of 45 degrees between an outlet of the pipeline and a vertical axis; s2, argon is introduced into the pressure-bearing pipeline 5 seconds before pouring, the pressure of the argon is 0.1-0.3 MPa, and argon introduction is stopped immediately when pouring is stopped; and S3, in the cooling process of the molten metal in the casting mold cavity, argon bubbles float upwards to bring inclusions to a top slag collecting groove, and a slag collecting groove is removed during sand cleaning and cutting. According to the steel barrel piece, contact between the atmosphere and molten metal is isolated, and oxide inclusion is effectively prevented; and meanwhile, argon is blown in in the pouring process to form bubbles and enter a casting mold cavity, and casting defects can be effectively reduced according to the principle that the bubbles float upwards to take away inclusions.

The invention relates to the field of sand mold casting, in particular to a casting method of a bearing groove. The problems that in the prior art, the bearing groove part is still sintered and burnt-on sand is serious, burnt-on sand can only be cleaned through burning and cutting of an oxygen dissolving rod, a large amount of manpower and material resources need to be consumed in the finishing process, a body is prone to being seriously damaged during cleaning, the molded line and quality of the bearing groove are affected, and casting scrapping is even caused by serious burnt-on sand are solved. According to the casting method of the bearing groove, the sand burning problem of the thick and large-section bearing groove and the airway surface is solved, and the appearance quality of similar castings is effectively improved. The special core bar and the chromium ore sand core are matched with the special graphite chilling block to form a whole, and the sand burning-on resistance of the graphite chilling block is utilized, so that the sand burning-on problem of the bearing groove is effectively solved. Meanwhile, the size of the special core bar and the graphite chilling block are flexible and adjustable according to the sand core structure, and the universality is high.

The utility model relates to the technical field of precoated sand casting, in particular to a precoated sand shell-making mould for an automobile rear suspension support, which comprises an upper mould and a lower mould, the upper mould is provided with a deep cavity and a high platform along with a shape product, the deep cavity is provided with three convex ribs, sand shooting holes penetrating to the top of the upper mould are arranged in interval grooves of the convex ribs, and the upper mould is provided with a plurality of sand shooting holes penetrating to the top of the lower mould. A surrounding cavity is formed in three surfaces of the high platform, a first inverted conical cavity is formed in the top of the high platform, and a plurality of second inverted conical cavities are formed in the surrounding cavity; the lower die shape follow-up product is provided with a trapezoid table corresponding to the deep cavity and a bottom groove corresponding to the high table, and pattern dies corresponding to the surrounding cavity are arranged on the two sides of the bottom groove. According to the mold, part of the mold shell of a product can be rapidly prepared in a high-quality mode, the surface of the prepared mold shell is smooth, mold repairing is not needed, and then a cavity for casting the product is formed after the mold shell and a mold shell prepared through another mold are assembled.

The application belongs to the field of core shooting machines, in particular to a kind of foundry coated sand core shooting machine, including frame, movable die assembly, fixed die assembly, sand shooting assembly, sand supply assembly, and the fixed die assembly includes upper die;The upper die and frame are in fixed connection;The upper die top is provided with sand inlet, and bottom is provided with forming chamber;The inner wall of the upper die is provided with exhaust air duct;The bottom of the exhaust air duct is provided with a plurality of first exhaust ports, and the first exhaust port is in communication with the forming chamber;Through the cooperation of first exhaust port, exhaust air duct and second exhaust port, the forming cavity of upper die and bottom die can be exhausted, to reduce the loosening of sand particles in the cavity caused by gas, improve the density and smoothness of the surface of the formed sand core, and at the same time, through the setting of the protrusion, the escape speed of the gas in the exhaust air duct can be accelerated, thereby ensuring the exhaust effect of the device.

The utility model discloses an efficient molding device for molding sand casting, which comprises a base, a stand column, a top plate, a cavity, a lifting unit and a driving mechanism, the stand column is arranged on the base along the longitudinal direction, the top plate is fixedly arranged at the top of the stand column, the cavity is detachably arranged on the base, and the lifting unit is arranged on the base. The lifting unit is arranged at the bottom of the top plate in the longitudinal direction and is in transmission connection with the cavity, the driving mechanism is arranged at the bottom of the base and is in transmission connection with the cavity, the surface of the base is provided with sliding grooves which are arranged in a crossed mode, and the cavity comprises a top cover, a bottom plate and four side plates arranged around the top cover and the bottom plate. According to the utility model, the cavity side plates can be driven to be automatically opened and closed through the driving mechanism, and the top cover can be driven to be automatically opened and closed through the lifting unit, so that molding sand can be conveniently filled into the cavity, and mold opening and demolding can be conveniently carried out after casting is completed, and the production efficiency of molding sand casting is further improved.

This invention discloses a coating for sand casting of aluminum-lithium alloys and its preparation method. The coating comprises a surface layer in contact with the sand mold and a top layer in contact with the melt. The surface layer material is an alcohol-based zirconium oxide coating containing graphene, and the top layer coating is an alcohol-based boride coating containing titanium diboride and zirconium diboride. This invention effectively improves the coating density and heat transfer rate by doping graphene with metal boride nanoparticles. Using graphene, ceramic materials, and metal borides as aggregates and dopants effectively suppresses the burn-off of light elements such as Li, reducing subcutaneous pinholes and porosity defects in the casting. Using zirconium oxide powder as aggregate increases nucleation sites, effectively improving the quality of non-ferrous metal castings.

This invention discloses a frustum-shaped chill for the firing surface of cylinder heads in sand casting, belonging to the technical field of casting process auxiliary parts. The chill includes a chill body with multiple circular bosses evenly distributed along the radial direction on its top surface for precise positioning within the sand mold. The top surface of the body has crisscrossing venting grooves to expel gases generated during the solidification of the sand core and molten metal. The body is divided into upper and lower frustum sections, with the upper frustum being higher than the lower frustum, forming a gradient cooling structure. Through structural optimization, this invention achieves precise and controllable cooling of the cylinder head firing surface, reducing defects such as shrinkage porosity, looseness, and gas porosity to near zero, improving casting density and yield, and is suitable for sand casting production of various aluminum engine cylinder heads.

This invention relates to the field of sand casting technology and discloses a follow-up sand-receiving tray structure for casting. It includes a recovery box and a support component rotatably mounted inside the recovery box. A buffer guide component is installed on the support component, and a support component is slidably mounted on the buffer guide component. In this invention, as the support component rotates, the support component slides diagonally downwards along the buffer guide component, immersing itself in the recovered sand in the recovery box. As a stepper motor drives the support component to rotate, the support component resets, and the recovered sand is spread evenly across the support component. Due to the arc-shaped design of the reinforcing rib frame (lower in the middle and higher at the edges), after the recovered sand is spread across the support component, it covers the reinforcing rib frame. When the sand box flips, the center of the support component corresponds to the high-temperature casting. At this time, the casting is buffered by the recovered sand spread across the support component, significantly reducing the impact force on the casting and preventing direct contact between the casting and the ribs on the reinforcing rib frame, thus reducing casting damage.

The lost wax manufacturing method of the earphone frame comprises the following steps: platemaking to form a wax mold in the shape of the earphone frame; copying the wax mold to obtain a silica gel mold; metal slurry is cast to obtain the earphone frame, the earphone frame comprises a sound production component containing part, a functional component containing part and a connecting component, and the two ends of the connecting component are connected to the sound production component containing part and the functional component containing part respectively. Compared with a traditional sand casting process, the sand casting manufacturing process of the earphone frame can be suitable for precise mass production, certain manpower and material resource cost is reduced, and accessories can be embedded in the casting process.

This invention belongs to the field of cryogenic sand casting technology, specifically relating to a composite sand mold for cryogenic sand casting and its preparation method. The preparation method includes: based on the size and shape of the casting, the structure and three-dimensional dimensions of the cryogenic sand blank; preparing cryogenic sand blanks according to a preset structure and three-dimensional dimensions; performing subtractive processing on the cryogenic sand blanks according to a preset subtractive processing procedure to obtain a sand mold; wherein the sand mold includes a cryogenic sand mold and a resin sand mold disposed on one side of it; and closing the separately prepared upper and lower sand molds to form a cavity, thereby obtaining a composite sand mold for cryogenic sand casting. The preparation method of this invention can at least improve the problem of floating sand during cryogenic sand mold blank preparation and moldless subtractive processing, while also improving the processing performance of the sand mold and increasing the gas generation during pouring.

The magnesium alloy sand mold casting quantitative shakeout device comprises a sand box, a partition plate is fixed in the sand box, the partition plate vertically penetrates through an opening and is communicated with a sand leakage pipe, the sand leakage pipe is provided with a controller, the magnesium alloy sand mold casting quantitative shakeout device further comprises a sand measuring box fixedly connected to a sand measuring area, and the sand measuring box is of an upper opening structure; the bottom of the sand measuring box is matched with and vertically connected with a bottom plate in a sliding mode, the bottom plate is of a through opening structure and is communicated with a sand discharging pipe, the sand discharging pipe penetrates through and is connected to the sand box in a sliding mode, the sand measuring box is further connected with a sand locking plate in a sliding mode, and the sand locking plate is used for being inserted into the sand discharging pipe. The sand metering box is fixed in the sand metering area to close or disconnect the sand discharging pipe, a vertical linear driving part is further fixed in the sand metering area, and the driving end of the vertical linear driving part upwards penetrates through the sand metering box and is connected to the bottom plate. The technical problem that an existing quantitative shakeout mode cannot guarantee the quantitative precision can be solved.

The utility model relates to the technical field of drawing devices, and discloses an anti-damage drawing device of a sand casting mold, which comprises a mounting base, a support rod body and an upper transverse plate body, a traction rope is wound outside a winding shaft, and the bottom of the traction rope is connected with a clamping seat. By arranging the uniform drawing structure, the two groups of clamping seats are clamped with the two sides of an upper die guide plate of a casting die body during use, the anti-skid clamping blocks at the tops of the adjusting screw rods are driven to ascend and descend in the clamping seats to clamp the upper die guide plate of the casting die body, and then an upper guide cross rod is placed at the tops of the clamping seats; the upper fixing knob is inserted into the top of the upper guide cross rod to be in contact with the clamping seat, then the two-way motor drives the winding shaft to rotate and wind the traction rope, the traction rope pulls the clamping seat and an upper die of a casting die body fixed by the clamping seat to be pulled upwards for drawing, and the clamping seat is kept stressed uniformly through the upper guide cross rod, so that the uniform drawing function is realized.

The present application relates to the technical field of high-strength aluminum alloy precision casting, and particularly relates to a ZL205A thin-wall component 3DP sand mold casting process, S1, a digital design casting model and a pouring system simulation are adopted to export a printing slice; S2, a mixture of silica sand and zircon sand is adopted, phenolic resin is used as a binder, and an environmentally-friendly sulfonic acid curing agent is used as a curing system to complete sand mold printing; S3, the sand mold is precisely processed to obtain a to-be-assembled mold; S4, ZL205A alloy is melted and refined, an Al-Ti-B-RE composite refiner is added after refining, the adding amount is 0.4wt%, the refined product is preserved for 15 minutes, and the casting mold is preheated at different temperatures at different thickness positions; S5, local gap pouring and bottom pouring are adopted for pouring; S5, post-processing and qualification detection are performed on the casting, the present application adopts the core advantages of a composite pouring process and a regional gradient preheating process, and completely solves the casting defect pain point of variable-wall-thickness components.

This invention discloses a sand-cleaning device and its operating method for automobile cylinder head sand casting, relating to the field of automobile cylinder head production technology. It includes two sand-cleaning bodies, each equipped with: a transmission component for moving the automobile cylinder head; a linkage component for rotating the automobile cylinder head while it is moving; a limiting component for limiting the rotation of the automobile cylinder head; a guiding component for guiding the moving automobile cylinder head; and a buffer component for buffering the rotation of the automobile cylinder head. This invention further solves the problem that traditional sand-cleaning devices for automobile cylinder head sand casting often leave residual sand in the cylinder head cavity after casting, making it difficult for traditional water washing and air suction devices to effectively clean the cylinder head cavity. This is achieved by setting a buffer rod on the inner wall of the limiting groove and a fixing block on the outer wall of the buffer rod, allowing the gear plate to continuously rotate the automobile cylinder head via a clamping plate.

The invention provides a metal core disappearance method precoated sand casting process suitable for a hollow metal casting. The metal core disappearance method precoated sand casting process comprises the following steps that a sand shell mold and a sand core mold of a hollow metal casting product are designed and manufactured according to the shape follow-up of the hollow metal casting product; according to the hollow position needed by the hollow metal casting, a metal core with a fixed point location is designed and manufactured in a shape follow-up mode; respectively manufacturing a precoated sand shell mold and a precoated sand core by using the sand shell mold mold and the sand core mold based on an injection molding machine; the precoated sand shell mold serves as a mold cavity, the metal core and the precoated sand core serve as a combined mold core, meanwhile, the metal core and the precoated sand core are arranged on the inner side and the outer side of the interior of the position needing to be hollow correspondingly, and the hollow metal casting is manufactured by pouring high-temperature molten steel, and the metal core is gradually melted and disappears to form an internal hollow structure after the high-temperature molten steel is poured. The problems that a metal mold core in a cast hollow metal casting is difficult to take out and complex and troublesome in treatment, and the cast hollow metal casting product is low in yield and has internal stress defects in quality can be solved; and meanwhile, the problems that the quality of a casting is damaged, the production efficiency is reduced and the environment is polluted due to the fact that the interior of the precoated sand mold core is cleaned in the later period can be solved.

The utility model relates to the technical field of casting and metallurgy, in particular to a sand box for sand mold casting, which comprises a first sand box, a second sand box and a pouring part, a plurality of stacked sand cores are arranged in the first sand box and the second sand box, the plurality of sand cores form a sand mold, and the pouring part is arranged in the sand mold. The pouring part comprises a pouring cup, a straight pouring gate and a plurality of bidirectional pouring cross pouring gates which are communicated in sequence, and casting molten iron passing through the pouring part is injected into the sand mold. According to the sand box for sand mold casting, the production quality of large-diameter castings is improved, the pouring time is greatly shortened, meanwhile, the utilization rate of the space in the sand box and molding sand is increased, and waste of the molding sand and molten iron is also avoided.