898results about "Moulding machines" patented technology

The invention belongs to the technical field of casting, and particularly relates to a process for improving the appearance quality of a casting by using a sand-isolating chilling block, which comprises the following steps: step 1, during molding or core making, firstly paving a layer of molding sand between risers or in a hot spot area; step 2, fixing the chilling block by using molding sand or supporting nails to ensure that the position of the chilling block is stable; 3, sand is discharged to wrap the chilling block, and it is ensured that a sand layer is firm through compaction operation; 4, after the molten steel is poured, heat of the molten steel is conducted to the chilling block through the sand layer, the local cooling speed of the casting is increased, and sequential solidification is achieved; and 5, after pouring, heat preservation is conducted till box opening is conducted, and an intact casting is formed. According to the invention, a layer of molding sand with a specific thickness is placed between the external chilling block and the mold, so that the external chilling block is converted into the sand insulation chilling block, and in order to ensure that the chilling block achieves the effect of process design requirements and can effectively play a chilling role on a casting, the thickness and size of the chilling block and the thickness of a sand insulation layer can be properly adjusted according to the size of a hot spot of the casting.

The invention discloses a core shooter with a quick mold changing structure and a matched core box, and relates to the technical field of mold manufacturing. A core shooter movable plate is provided with a seam allowance groove and an electromagnetic coil, a core box upper mold is provided with a seam allowance boss with a permanent magnet, and three-stage magnetic coupling control is achieved through a control system, specifically, during mold closing, homopolar repulsive force guiding is conducted to avoid collision, during positioning, heteropolar attraction force locking is conducted, and during mold changing, homopolar repulsive force pushing separation is conducted. And three-dimensional accurate positioning and mechanical redundancy locking are formed by a clamping jaw clamping mechanism driven by a double-acting oil cylinder under the assistance of taper fit of right-angle limiting grooves in the four corners of the supporting plate and positioning blocks of the fixing plate. Through magnetic coupling automatic guiding and mechanical cooperative clamping, the mold changing time is shortened to be within 2 minutes from 30-40 minutes, single-person operation is achieved, the positioning precision and the vibration resistance are improved, the labor intensity is remarkably reduced, and the mold changing device is suitable for efficient and continuous production in the casting industry.

The invention discloses a spiral water channel sand core integral positioning hot core box which comprises a base and a spiral water channel sand core, a sand shooting device is installed on the upper portion of an upper mold, a transverse moving mechanism is installed at the bottom of a supporting plate and used for driving the upper mold to transversely move, an air duct is fixedly installed on the upper portion of the upper mold, and the lower end of the air duct penetrates through the bottom of the upper mold. A negative pressure fan is fixedly installed on the supporting plate, the air draft end of the negative pressure fan is communicated and connected with the air duct through a hose, positioning pipes are fixedly installed at the two ends of the spiral water channel sand core, and rear sticky blocks are arranged on the inner sides of the side molds and connected with the positioning pipes at the corresponding positions in an inserted mode. The upper mold can be controlled to move through the transverse moving mechanism, so that the position of the sand shooting device is adjusted, during sand shooting, air suction is conducted on the interior of the cavity through the negative pressure fan, fine sand in a hot core box can be sucked out, the forming quality of spiral water channel sand blasting is guaranteed, meanwhile, a spiral water channel sand core is bonded through the rear bonding block, and the production efficiency is improved. The positioning precision of the spiral water channel sand core can be ensured, and the operation labor intensity is reduced.

The present invention relates to the technical field of casting of automotive parts, and specifically to a casting sand mold forming device and method for automotive parts. An upper microporous plate and a lower microporous plate are arranged at intervals up and down in the air guiding flow channel. The lower microporous plate is located in the air guiding flow channel, and the upper microporous plate is pressed on the stepped surface communicating between the annular groove and the air guiding flow channel. The upper microporous plate and the lower microporous plate are connected by multiple groups of air pipes. The beneficial effects are as follows: By adding a pouring and ramming component to the existing casting process, multiple groups of sand injection channels can be used to selectively choose the sand injection position, and the sand injection position can be selected according to the characteristics of the model part to ensure complete filling of the small holes and grooves. At the same time, the air guiding flow channel is used to further carry out negative pressure air extraction on the sand mold after extrusion and compaction, reduce the gap between the sand bodies, improve the overall ramming strength, ensure the integrity of the sand mold after overall demolding, avoid collapse, and greatly improve the qualified rate.

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

The invention relates to the technical field of casting modeling, and discloses magnetic suspension vacuum pump body high-toughness aluminum alloy end cover casting equipment which comprises a jolt ramming table and a sand box body arranged at the top of the jolt ramming table, a fixed bottom plate is arranged in the sand box body, and a slidable lifting box is arranged at the bottom of the fixed bottom plate; a plurality of positioning rods are elastically installed in the lifting box, first through holes allowing the positioning rods to pass through are formed in the top face of the fixed bottom plate, the rod walls of the positioning rods are slidably attached to the inner walls of the first through holes, and the top ends of the positioning rods are arranged in an arc mode. According to the device, the bottom of the white mold in an irregular shape is attached to the outline of the positioning rod array, the placing stability of the white mold in the irregular shape is guaranteed, compared with a traditional manual sand padding fixing mode, the defects of cold shut and insufficient pouring caused by inclination of the white mold are fundamentally overcome, and the equipment adaptability and the production efficiency are remarkably improved.

A casting mould for producing a casting formed from a light metal alloy, in particular a housing for an electric drive for a motor vehicle. The casting mould advantageously has at least one sand core which is designed and arranged in the casting mould in such a way that the at least at least one sand core can be completely surrounded, at least in sections, in a circumferential direction by a light metal melt with which the casting mould is filled to form the casting. It is advantageous to be able to produce a casting in which, for example, a cooling channel is incorporated. It is not necessary to drill a hole to form a channel. Furthermore, the invention relates to a process for manufacturing a casting made of a light metal alloy, in particular a housing for an electric drive for a motor vehicle.

The invention provides a train coupler casting method based on a precoated sand shell mold and a shell mold structure, and belongs to the technical field of ferrous metal casting, and the shell mold structure comprises a mold shell, an outer chilling block, an exothermic riser, an anti-scouring pouring gate, a core, an exhaust cap and an assembling method thereof. Wherein the mold shell comprises an outer shell assembly and an inner shell assembly, and the thickness of the outer shell assembly is larger than that of the inner shell assembly; the shell is further characterized by a hollow structure of a local thick and large part, an ox horn type flow gate and a cavity exhaust structure. The outer shell assembly is used for forming the outer shape of the coupler body, the inner shell assembly is used for forming the hollow part of the coupler body, and the characteristics of the coupler body casting mold are beneficial to obtaining the coupler body casting with high dimensional precision and good surface quality and internal quality, reducing the adverse effect of resin gas generation on the product, reducing the influence factor of shrinkage blocking, and improving the production efficiency. And the tendency of air holes and cracks of the casting is reduced.

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

The utility model discloses a double-station horizontal hot core machine, which comprises a hot core machine, a double-station circulating feeding mechanism and a mould push-pull mechanism, the double-station circulating feeding mechanism comprises a roller way, the roller way is provided with a mould lower mould I and a mould lower mould II, the mould lower mould I moves back and forth between a core taking position I and a mould machine entering position, and the mould lower mould II moves back and forth between a core taking position II and a mould machine entering position. The second lower mold body moves back and forth between the second core taking position and the mold machine entering position, a machine entering position rail is arranged on one side of the mold machine entering position, the upper mold body can be assembled with the first lower mold body and the second lower mold body on the machine entering position rail, and a piston of the jacking hydraulic cylinder penetrates through the connecting frame to be connected with the sand core demolding top plate. Ejector rods are arranged on the two sides of the sand core demolding ejector plate, and a push-pull hydraulic cylinder and an overturning hydraulic cylinder are connected to the overturning hook. The sand core curing time is parallel to the other sand core taking time, the production takt time of the hot core machine is greatly shortened, and the equipment is based on a conventional hot core machine and is matched with a double-station circulating system, so that the equipment is flexible and convenient to operate and high in production efficiency.

The present invention discloses a casting mold vibrating and compacting mechanism and an intelligent casting island, comprising a conveying frame, a jacking device and a vibrating device. A conveying trolley is provided on the conveying frame, and a sand box is provided on the conveying trolley. Fixed pipes are fixedly provided on both sides of the conveying trolley, and sliding pipes are rotatably and slidably provided on the fixed pipes. When fixing the model, the second connecting rope is stretched by pulling the hook, and the reel is rotated to hang the model. The hooks on both sides can pull different lengths to adapt to models of different specifications. After the model is hung, the hooks on both sides and the model are simultaneously lowered into the sand box by sliding the reel. In addition, in the process of adding molding sand and vibrating and compacting it, instability of the model is avoided. After the molding sand buries the bottom of the model and is vibrated and compacted, the hook is separated from the model by a decoupling component, which not only improves efficiency, but also ensures the stability of the model during the sand adding process, improves the subsequent pouring effect, and thus improves the quality of the casting.

The invention relates to the technical field of investment mold shell casting, in particular to an investment mold shell casting system which comprises a rack, a slurry barrel, a roasting furnace, a cooling barrel and a slag collecting barrel are sequentially installed on the rack in the clockwise direction, and multiple sets of regularly-distributed elastic striking rods are installed on the inner wall of the slag collecting barrel. A loading and unloading station is arranged at the position, corresponding to the position between the slurry barrel and the slag collecting barrel, of the machine frame, a casting frame is installed on the machine frame in a liftable mode, a transmission unit is arranged on the casting frame, and the transmission unit is in transmission connection with a rotating station frame capable of periodically rotating by 72 degrees and a rotatable transmission gear ring. The casting equipment has the beneficial effects that casting links such as ceramic slurry coating, roasting, cooling and slag collecting are integrated into the same equipment, and the orderly circulation of a parison among the links is realized through the slurry barrel, the roasting furnace, the cooling barrel and the slag collecting barrel which are sequentially arranged on the rack in the clockwise direction and the rotary station frame capable of periodically rotating.

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 relates to the technical field of casting processing, in particular to a core shooter convenient for die replacement, which comprises a lower die, an upper die, a first moving module and a base frame, the first moving module is arranged on one side of the base frame, the upper die is detachably mounted on the first moving module, and a template seat is mounted on the base frame through a second moving group; a plurality of vertical holes B are uniformly distributed in the template seat, two vertical holes A are formed in the template seat, and a frame body A and a frame body B are arranged at the bottom of the template seat; two positioning pins are fixed to the frame body A and installed in the corresponding vertical holes A in a telescopic and sliding mode respectively, and two positioning holes A are formed in the bottom of the lower die. Moving-in and moving-out of the mold are completed by matching the movable transfer table with the mold plate base, translation replacement of new and old molds is achieved, a traditional hoisting operation mode is replaced, the shaking and falling risks in the hoisting process are avoided, the safety of mold replacement operation is improved, meanwhile, the mold transfer path is simplified to a two-dimensional plane from a three-dimensional space, and the production efficiency is improved. And the die changing process is stable and controllable.

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

A gantry core shooter, comprising: a conveying member (120), a sand shooting member (130), an air blowing member (140), a support member (150), and a gantry (110). The conveying member, the sand shooting member, the air blowing member, and the support member are sequentially arranged from top to bottom, the sand shooting member is simultaneously communicated with the conveying member and the air blowing member; the support member is configured to accommodate a sand core; the sand shooting member and the air blowing member are both connected to the gantry; the gantry is configured to drive the sand shooting member, the air blowing member, and the conveying member to move; and the conveying member is configured to convey sand and gas to the sand shooting member. According to the gantry core shooter, the sand shooting member, the air blowing member, and the conveying member can be driven to move by the gantry during working, so as to achieve sand shooting operation of an ultra-large sand core; and the conveying member can respectively convey sand and gas in different working stages, such that a sand supply structure and a gas supply structure are simplified, thereby improving the core manufacturing efficiency.

The invention relates to the technical field of 3D printing, and discloses a sand mold 3D printing full-process automatic production line and a production method.The production line comprises a sand mold printing area, an auxiliary equipment area, a dip-coating detection area, a drying area and a plurality of transfer equipment, the sand mold printing area comprises a plurality of sand mold 3D printing equipment, and each sand mold 3D printing equipment comprises a printing work box; a sand mold printed by the sand mold 3D printing equipment is contained in the printing work box. The sand mold 3D printing process can be unified, the product quality and the production efficiency can be improved, and the labor cost is reduced. According to the production line, full-automatic control is adopted, the whole production line is provided with transfer equipment for transferring sand molds, unattended operation can be achieved, the production efficiency is higher, manpower consumption is lower, the production line is provided with a visual inspection station for detecting defects of the sand molds subjected to paint dip-coating, unqualified sand molds are prevented from flowing out, and the production efficiency of the produced sand molds is greatly improved from the beginning of design to the completion of pouring. And the whole process can be traced.

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 relates to the technical field of casting, in particular to a precision casting shell making machine which comprises a hoisting part. The hoisting part comprises a driving piece and a hoisting mechanism, the hoisting mechanism is mounted on the driving piece, and the hoisting mechanism comprises a shell, a hanging basket, a sensing assembly and two hanging rods. The two hanging rods are eccentrically arranged on the shell and can rotate along with the shell. The hanging basket comprises a main rod and two hanging arms, and the main rod is connected with a fired mold; and the suspension arm is connected with a lifting hook on a corresponding suspension rod. The induction assembly is installed on the shell. According to the precision casting shell making machine, the axial relative displacement of the suspender is monitored through the induction assembly, eccentricity of a fired mold is fed back, after workpieces in the same batch are cast for multiple times, position exchange is achieved through rotation of the suspender and the shell, the suspender on the high-abrasion side and the suspension arm on the low-abrasion side can be matched again, the abrasion degree of the two sides is balanced, and the precision casting shell making machine is suitable for large-scale production. And the service life of the whole hoisting part is prolonged.

The invention provides a casting molding core shooter, and relates to the technical field of core shooters. The casting molding core shooter comprises a base, a sand blasting box, a compressed air supply device, a negative pressure pump, a filter box, a mold closing driving device, a sliding table, an upper mold plate and six groups of lower mold boxes. According to the core shooter, automation of the whole working process of the core shooter is achieved through cooperation of rotation of the first motor and overturning driving, the mold closing driving device, the material ejecting structure, the discharging structure and the cleaning structure, the production efficiency is greatly improved, before and after the lower mold box is overturned, positioning is achieved through cooperation of positioning pins and positioning holes in the outer wall of the lower mold box, and the production efficiency is greatly improved. The lower mold box is kept still during mold closing and core shooting, material ejecting and cleaning, the running precision of equipment is improved, the cleaning station is arranged behind the discharging station, redundant sand in a mold closing surface and a cavity is cleaned up in the mode that compressed air is blown and then a negative pressure pump is used for sucking dust, the mold closing precision is improved, and the mold closing efficiency is improved. And meanwhile, pollution to the surrounding environment in the cleaning process is also avoided.

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 provides a bilateral sand-shooting core shooter which comprises a rack, a bottom plate and a top plate are arranged in the middle of the rack, the two ends of a guide rod are connected with the bottom plate and the top plate respectively, a lower mold assembly is installed on the top face of the bottom plate, a jacking assembly is arranged at the bottom of the lower mold assembly and can jack up a sand mold to be separated from the lower mold assembly, and a telescopic rod is arranged in the center of the top plate in a penetrating mode. The top of the telescopic rod is connected with the output end of the telescopic air cylinder, the bottom of the telescopic rod is connected with the upper mold assembly, the upper mold assembly corresponds to the lower mold assembly, the top of the upper mold assembly is provided with the falling assembly, the falling assembly can eject a sand mold to be separated from the upper mold assembly, and core setting of the sand mold from the mold is facilitated through the jacking assembly and the falling assembly. The heating assemblies are inserted into the upper mold assembly and the lower mold assembly at intervals, the heating assemblies can evenly heat the upper mold assembly and the lower mold assembly, and the situation that the quality of a sand mold is affected due to temperature difference of molds is avoided.

The invention discloses an automatic sand cake forming device and method, and belongs to the technical field of sand cake manufacturing. The device comprises a stirring mechanism, a conveying mechanism, a forming mechanism and a tamping mechanism, and automatic production is achieved through double-station alternate operation and numerical control layered tamping. The method comprises the steps of material mixing, mortar conveying, metering and drying, double-station alternate tamping and curing demolding. According to the scheme, manpower input is reduced through full-process automation, the production efficiency is improved through the double-station rotary workbench, the consistency of the sand cakes is guaranteed through the numerical control system, and the method is suitable for high-precision large-scale manufacturing of the composite material winding pressure container core mold.

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 a sand-coated molding line for multiple large iron molds of large castings and a working method of the sand-coated molding line, and belongs to the field of machinery. The invention relates to a closed-loop large iron mold sand-coated molding production line. A first iron mold and model conveying track line is provided with an iron mold and model heating furnace device, an iron mold and model grabbing and moving mechanism, an iron mold sand-shooting and sand-coated device and an iron mold and model drawing and separating mechanism from right to left; the second iron mold and model conveying track line is provided with a mold closing station of the iron mold and the model and a plurality of bearing moving trolleys bearing the iron mold and the model after mold closing from left to right. The two transition transfer trolley tracks are respectively provided with a track-changing transition transfer trolley mechanism, the iron mold sand shooting and coating device adopts a pass-type sand shooting and coating molding mode, and the iron mold and model drawing separation mechanism adopts a pass-type drawing separation mode. The device is reasonable in structural design, stable, reliable, good in sand-coated casting quality, high in automation degree, convenient to install and smooth in technological process, and meets use requirements.

The utility model relates to the technical field of precoated sand core shooters, and discloses a core shooter with a precoated sand recovery device, which comprises a bottom plate, the core shooter is fixedly mounted on the upper surface of the bottom plate; and the core box is arranged on the upper surface of the bottom plate. A third connecting rod and a second rotating rod are pushed inwards, the third connecting rod drives a second connecting rod to move downwards through a fixing block, the second connecting rod drives a first sliding block to slide on the inner wall of a first sliding hole, meanwhile, the second connecting rod drives a scraping plate to move downwards, and the scraping plate drives the second connecting rod to slide on the outer wall of a connecting plate through a blocking rod. A first rotating rod is rotated, a second rotating rod slides into the inner wall of a limiting hole, the first rotating rod can be blocked by a fixing ring, then an electric telescopic rod is started, the electric telescopic rod retracts, a first connecting rod is driven by a connecting block to slide on the inner wall of a sliding rail, and the stop rod and the scraper are driven to move on the upper surface of the core box; and the precoated sand on the core is scraped into the collecting hopper, so that the effect of scraping redundant precoated sand is achieved.

The invention relates to the technical field of full mold casting, and provides an evanescent mode dry sand negative pressure molding process, EPS particles are doped with nanometer silane modified silicon dioxide with the mass percentage being 0.5% of that of the EPS particles, so that the strength of a foam model is improved by 20%, the heat deformation temperature is increased to 80 DEG C, and deformation in the molding and pouring process is reduced. The coating of the bottom layer of the model adopts 20% of bauxite and 5% of carbon fibers to be matched with a water-based binder, so that the air permeability is enhanced, and the coating of the surface layer of the model adopts 60% of emery and 10% of silica powder to be matched with a water-based binder, so that the fire resistance is improved. Pre-jolt ramming and main jolt ramming are carried out after sand filling, so that the compactness uniformity of dry sand is improved to 95% or above; sealing is carried out, main vacuumizing and auxiliary vacuumizing are carried out, the vacuum degree sealing performance during pouring is guaranteed, then pouring forming is carried out, and the vacuum degree is monitored in the pouring process, so that the stability of the vacuum degree in the pouring process is guaranteed; and finally cooling and releasing negative pressure to obtain the casting.

The invention relates to the technical field of sand core molds, and discloses a casting forming sand core mold which comprises a base and two sand core mold bodies. The two sand core mold bodies are arranged on the base and can be far away from or close to each other, and cavities are formed in the adjacent sides of the two sand core mold bodies; a loading piece is mounted at the top of the base, and a ceramic core bar and a core bar are loaded on the loading piece; and after the two sand core mold bodies are close to each other and are combined, the loading piece, the ceramic core bar rod and the core bar are arranged in the cavities in the two sand core mold bodies. The ceramic core bar rod is pre-embedded in the sand core, the characteristics of good high-temperature stability and high bending strength of the ceramic core bar rod are utilized, internal support is formed for the sand core in the molten iron pouring process, and deformation of the sand core in the vertical direction caused by thermal shock and molten iron buoyancy is effectively restrained, so that the size precision of a hydraulic part control valve main body casting is improved; and the subsequent processing correction and scrap cost is reduced.