169 results about "Sand casting" patented technology

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.

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.

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 discloses a metal liquid rapid degassing device for resin sand casting's intermediate frequency electric furnace, related to metal smelting technical field, including bottom plate, be provided with intermediate frequency electric furnace and electric furnace control part on the bottom plate, the bottom of intermediate frequency electric furnace is installed with the air inlet pipe, is installed with the connecting pipe on the air inlet pipe, is installed with the hose on the connecting pipe, is installed with the disconnection pipe on the hose, the top of bottom plate is rotatably arranged with the exchange disc, is installed with the sealing ring in the air outlet pipe, the exchange disc bottom is installed with the exchange shaft, and the exchange shaft rotatable installation is in the bottom plate, and the gear is fixedly sleeved on the exchange shaft, and the gear is intermittently engaged with the gear toothless wheel, and the driving motor is installed on the bottom plate, and the gear toothless wheel is installed on the drive shaft, the utility model discloses, can transport the argon in argon tank to the intermediate frequency electric furnace, and the argon in the intermediate frequency electric furnace will remove the harmful gas in metal liquid quickly. Single argon tank can be automatically and quickly replaced when using, and the operation is convenient and easy to use.

A box closing guide mechanism for casting production comprises an upper sand box and a lower sand box, the top and the bottom of the upper sand box are coated with plastic films, the top and the bottom of the lower sand box are coated with plastic films, and the box closing guide mechanism is characterized in that a guide plate is arranged on the side wall of the lower sand box in the box closing direction; the distance between the side wall, close to the lower sand box, of the guide plate and the outer side wall of the lower sand box is L, the thickness of the plastic film is L1, and L is larger than L1; an upper positioning plate is fixed on the side wall of the upper sand box, a guide post is fixed on the lower part of the upper positioning plate, a lower positioning plate is fixed on the side wall of the lower sand box, a guide hole is formed in the upper surface of the lower positioning plate, and the guide post is matched with the guide hole. When the box closing operation is carried out, the plastic film is not rubbed, so that the plastic film is not damaged, the vacuum degree of the sand box is ensured, and the normal operation of sand casting is ensured.

The utility model relates to the technical field of powder concentrator cleaning, and discloses a rotor powder concentrator cleaning device which comprises a cleaning pool, the cleaning pool is in a funnel shape, a water outlet is integrally formed in the bottom of the cleaning pool, and a sand casting layer is erected in the cleaning pool. The inner wall of the cleaning pool is connected with the lapped sand casting layer in a clamped mode through an arranged clamping and locking mechanism, an overturning mechanism is rotationally arranged in the sand casting layer, a first driving mechanism is arranged at the bottom of the inner wall of the cleaning pool, and the bottom end of the overturning mechanism penetrates through the sand casting layer and is connected with the first driving mechanism in an inserted mode. According to the cleaning device for the rotor powder concentrator, the problems that in the prior art, blades on a rotor are arranged closely, dust is extremely prone to being stored during cleaning, workers need to wipe the blades one by one, and the number of the blades on the rotor is large, so that the cleaning efficiency of the powder concentrator is seriously affected are solved.

This utility model discloses a casting structure for ADI material, belonging to the field of sand casting technology. It includes a gating system; a filter chamber comprising an upper pressure groove, a lower pressure groove, and several filters separating the upper and lower pressure grooves. One end of the upper pressure groove is connected to the gating system, and the groove width and cross-sectional area of ​​the upper pressure groove gradually increase away from the gating system. The outlet is connected to the lower pressure groove. The upper pressure groove's gradually increasing groove width and cross-sectional area away from the gating system allows for control of the amount of molten iron passing through each filter, reducing the risk of damage to the front-end filters due to excessive molten iron flow reaching their service life. This ensures each filter reaches its maximum filtration value, improving the filtration capacity of each filter and reducing the number of filters required. Simultaneously, the shape of the upper pressure groove utilizes fluid dynamics principles, transforming some of the turbulent flow in the molten iron into laminar flow, avoiding the increase of inclusions and gas entrainment, and reducing secondary slagging.

Flaw detection equipment for sand casting parts relates to the technical field of sand casting part detection equipment and comprises a base, two longitudinal guide rails are mounted on two sides of the upper end face of the base through supporting frames, longitudinal electric sliding blocks are slidably mounted on the outer portions of the longitudinal guide rails, and a transverse guide rail is fixedly mounted between the two longitudinal electric sliding blocks; a transverse electric sliding block is slidably mounted outside the transverse guide rail, an electric push rod is mounted below the transverse electric sliding block, a mounting head is mounted at the bottom of the electric push rod, an ultrasonic probe is mounted below the mounting head, and a positioning table is arranged on the front side of the upper end face of the base; by means of the scheme, the problems that flaw detection equipment cannot rapidly achieve comprehensive detection, and relative displacement of the casting and the probe is prone to occurring in the detection process are solved.

The utility model relates to the technical field of casting, discloses an improved core box structure, and aims to solve the problem that a traditional core box is short in service life due to the fact that vertical ribs are thin and easy to damage. The core box comprises an upper cover, a core box bottom, side edges and vertical ribs, four auxiliary supporting legs are additionally arranged at four corners of the upper cover, and the height of the auxiliary supporting legs is higher than that of the original vertical ribs; meanwhile, circular grooves are formed in the corresponding positions of the side edges, and the supporting legs are embedded into the grooves in the assembling process to form a stable supporting structure. When the core box upper cover is horizontally placed, the auxiliary supporting legs completely bear the weight, the vertical ribs are prevented from making contact with the ground, and therefore the hidden danger that the vertical ribs are damaged due to stress is eliminated. The auxiliary supporting legs are preferably made of cylindrical wear-resistant metal or engineering plastic, and the depth of the circular grooves is 1.2 times of the length of the supporting legs, so that the embedding stability is ensured. By optimizing stress distribution, the service life of the core box is remarkably prolonged, and the core box is simple in structure, easy to process and assemble and suitable for large-scale application in the field of sand casting.

This invention relates to the field of intelligent sand casting technology, providing a sand mold vent hole cleaning device and method. The automatic cleaning device includes an inner support frame, an outer support frame, an X / Y / Z-axis shifting mechanism, an air blowing pipe assembly, and a compressed air generator. A roller conveyor assembly is installed on the inner support frame, along which the sand box of the sand mold to be cleaned moves. After the sand mold vent holes are drilled, the sand box is moved to the inner support frame, and the air blowing pipe assembly is automatically inserted into each vent hole sequentially by the X, Y, and Z-axis shifting mechanisms to clean residual sand, resulting in high cleaning efficiency. This invention also utilizes a first weighing unit at the drilling station and a second weighing unit at the cleaning station to calculate the drilling and cleaning quality through weight differences, enabling online automatic monitoring of the sand mold vent hole cleaning effect, improving the level of intelligent sand casting, and ensuring casting quality.

The utility model relates to the technical field of propeller machining, in particular to a runner structure of a propeller sand casting mold. Comprising a mold shell, a feeding port is formed in the top of the mold shell, the mold shell is filled with molding sand, a forming cavity is formed in the molding sand, a material guiding runner is arranged on the portion, located on one side of the forming cavity, in the molding sand, the feeding port and the forming cavity are communicated together through the material guiding runner, and the material guiding runner comprises a vertically-communicated straight pouring gate. The settling cavity is arranged between the anti-impact ceramic plate and the third flow channel, so that the flow speed of raw materials entering the settling cavity is slowed down, large-particle impurities in the raw materials sink to the bottom of the settling cavity, meanwhile, the high-temperature-resistant fiber filter screen is arranged in the third flow channel, and small-particle impurities in the raw materials are filtered out through the high-temperature-resistant fiber filter screen. Therefore, it is guaranteed that the raw materials entering the forming cavity do not contain impurities exceeding the qualified amount, and the casting quality of the propeller is guaranteed.

The present application relates to a kind of based on " V " method composite lost foam forming casting process and its application.The process is aimed at the defects of existing " V " method and lost foam casting process when producing 30-60kg castings, innovatively combines the two.First, specific specification EPS beads are selected to make white mold, after steam prefoaming, vulcanization bed drying and curing, with specific process parameters, steam heating type semi-automatic forming machine is formed.Then, using bauxite, bentonite and other materials to make 1 layer shell, the shell making cost is low, and can reduce labor intensity and material consumption.The drying temperature and time are determined by measuring the expansion and shrinkage curve of white mold.Finally, through " V " method sand casting and negative pressure pouring, the casting is obtained.This process integrates the advantages of two processes, solves the problems of traditional process, is suitable for automobile low alloy complex casting production, can also reduce pollution emission, and has good application prospect.

This invention relates to the field of sand casting technology and discloses an integrated mechanism and process for impregnation, coating, and drying of sand casting cores. The mechanism includes an integrated impregnation, coating, and drying machine. A support platform is installed inside the machine, and a base block is installed on top of the support platform. A mold core is bolted to the top of the base block. This integrated mechanism utilizes a limiting component. When the bolts loosen, the threaded column moves upward along the connecting column and the strip groove, driving the slider upward synchronously. This pushes the movable rod outward, causing the moving block to slide along the strip block towards the limiting column. An insert plate is inserted into the surface of the limiting column to form a radial lock. Simultaneously, the long plate pulls the movable strip, causing the torsion ring to rotate and generate a reverse self-locking torque. This, combined with the axial limiting of the limiting column, prevents the bolts from loosening, rotating, or coming out. This prevents the mold core from shifting or failing during impregnation and drying, significantly improving assembly firmness, operational stability, and core forming quality.

This invention relates to the field of resin sand casting technology, and more particularly to a resin sand casting mold coating equipment. The key technical points of this equipment include: a track device mounted on the ground; a rotating placement device mounted on the track device for placing the mold and driving its rotation, the track device driving the rotating placement device to translate so that it enters the processing station; a displacement device mounted on the ground and adjacent to the processing station; a spraying device mounted on the displacement device, the displacement device driving the spraying device to move, the spraying device for spraying coating onto the mold surface; and an ignition device mounted on the displacement device, the displacement device driving the ignition device to move, the ignition device for igniting the coating applied to the mold surface. This application solves the problems of low coating efficiency and potential harm to the human body in existing coating processes.

The utility model relates to the field of coated sand casting technology discloses a coated sand shell mould for automobile rear suspension support, including coated sand lower mould, the left side fixed coupling of coated sand lower mould has the mounting bracket, the left side fixed coupling of mounting bracket has the hydraulic cylinder, the right side fixed coupling of hydraulic cylinder has coated sand upper mould, the inside of coated sand lower mould is provided with auxiliary stripping mechanism, the top of coated sand lower mould is provided with auxiliary dust removal mechanism, in the use process, through the rotation of worm, conveniently realize the satisfaction to the clamping limit of different size external temperature control equipment connecting pipe, through the motor work, conveniently realize the adjustment ejection plate position, satisfy the ejection of the coated sand shell of the automobile rear suspension support of processing completion, through the work of electric telescopic handle, conveniently realize the adjustment deflector angle, satisfy the full suction of the additional coated sand of filling overflow between coated sand lower mould and hydraulic cylinder, reduce environmental pollution.

The invention discloses an overturning platform for sand mold casting construction and a construction method.The overturning platform comprises two door frames, a base and a bearing frame, the bearing frame is rotationally connected between the two door frames, limiting chucks are arranged on the outer walls of the two ends of the bearing frame, at least three clamping grooves are formed in the edges of the outer rings of the limiting chucks, and the limiting chucks are arranged in the clamping grooves; a connecting shaft is arranged in the center of the outer wall of the limiting chuck and connected with the portal through a bearing seat, a nut is arranged at the top of the bearing seat, an inserting rod is connected into the nut through threads, the inner end of the inserting rod extends into the clamping groove, and a transfer trolley is arranged on the ground on one side of the bearing frame. By integrating the overturning and transferring functions, stable overturning and efficient transferring of the sand box are achieved, the quality and size precision of castings are improved, the defects of the castings caused by misoperation are reduced, the labor intensity of workers is effectively relieved, and the safety risk caused by manual misoperation is reduced.

The utility model discloses a paint smearing device for V-method casting, which belongs to the technical field of sand casting and is characterized in that a first lifting plate is movably arranged below a cleaning cavity, a plurality of groups of driven gears are movably mounted on the first lifting plate, a cleaning spray pipe is arranged in the middle of each driven gear, and a plurality of groups of cleaning nozzles are arranged at the bottom of each cleaning spray pipe; a plurality of groups of air pipes movably connected with the cleaning spray pipes are arranged at the output end of the fan, and movable joints are further mounted at the tail ends of the air pipes; a second lifting plate is movably arranged below the spraying cavity, a storage bin is arranged at the top of the second lifting plate, multiple sets of vertical first nozzles are arranged at the bottom of the second lifting plate, and multiple sets of inclined second nozzles are further arranged on the two sides of the first nozzles. The cleaning spray head can be driven to rotate through the gear ring so as to sufficiently blow the inner wall, the height of the second lifting plate can be adjusted through the second air cylinder so as to be matched with the first spray nozzle and the second spray nozzle to spray paint on the inner wall of the mold, and the practicability and the stability are improved through the design.

A method of manufacturing a sand casting hybrid tooling pattern plate used to form a mold in foundry sand includes providing a base plate having a planar surface, creating a surface condition on the planar surface of the base plate for subsequent additive manufacturing directly on the surface, and forming, via additive manufacturing, a mold-cavity-forming pattern member on the planar surface of the base plate.

The application discloses modified molten ceramic sand and a preparation method and application thereof, and belongs to the technical field of 3DP printing sand casting materials. The preparation method of the modified molten ceramic sand comprises the following steps: S1, mixing modified acrylic acid with water to obtain a coating liquid; S2, mixing molten ceramic sand with the coating liquid, and then continuously mixing at 30-40 DEG C to obtain coated molten ceramic sand; and S3, heat preserving the coated molten ceramic sand at 80-110 DEG C to obtain modified molten ceramic sand. In addition, the application further provides modified molten ceramic sand prepared by the above preparation method. In addition, the application further provides application of the modified molten ceramic sand in 3DP printing sand casting. The modified molten ceramic sand provided by the application has strong acid corrosion resistance.

A method of manufacturing a sand casting hybrid tooling pattern plate used to form a mold in foundry sand includes providing a base plate having a first surface and a second surface opposite the first surface, forming a recess in the first surface of the base plate, creating a suitable surface condition on one or more surfaces of the recess suitable for subsequent additive manufacturing directly on that surface; and forming, via additive manufacturing, a mold-cavity -forming pattern member within the recess such that a first portion of the pattern member is coupled within the recess and a second portion of the pattern member extends from the first surface of the base plate.

The utility model relates to the technical field of precoated sand casting machining, in particular to a precoated sand casting tool which comprises a mounting seat and a workpiece fixing seat, the workpiece fixing seat is connected to the inner wall of the mounting seat in a sliding mode, the surface of the workpiece fixing seat is rotationally connected with a rotating disc, and the surface of the rotating disc is rotationally connected with a reverse lead screw. The outer wall of the reverse lead screw is in threaded connection with an expansion assembly. According to the improved casting tool, a first nut disc and a second nut disc are driven to move relatively through a reverse lead screw, a first jacking block and a second jacking block which are distributed in an equiangular mode are driven, the opening degree of filler blocks is accurately adjusted, the filler blocks are tightly attached to axis through holes of workpieces of different sizes, and firm clamping is achieved; the rotating disc drives the workpiece to rotate through gear transmission, re-clamping is not needed, the clamping frequency is reduced, and the height of the workpiece fixing base can be accurately adjusted through a worm, worm wheel and lead screw transmission system so as to adapt to the position difference of the machining ends of different machining devices.

The invention belongs to the technical field of metal casting, and particularly relates to a quick-cooling sand mold casting method for the automobile field, which comprises the steps of sand mold preparation, sand core freezing, mold closing, pouring, quick cooling, demolding, post-treatment and the like. A sand mold freezing mode is adopted, the temperature difference between the molten aluminum temperature and the casting mold temperature after casting pouring is increased, the casting cooling speed is increased, and grain refinement and eutectic structure spheroidization are achieved.

A sand mold casting pouring device for machine tool accessories relates to the technical field of sand mold casting and comprises a longitudinal adjusting device, a transverse adjusting device is movably mounted above the longitudinal adjusting device, a sand box placing table is movably mounted above the transverse adjusting device, supporting frames are arranged on two sides above the rear end of the longitudinal adjusting device, and the supporting frames are connected with the transverse adjusting device. A limiting barrel is arranged between the two supporting frames, a casting ladle is movably installed in the limiting barrel, dip angle adjusting rods are fixedly installed on the two sides of the limiting barrel correspondingly, the other ends of the dip angle adjusting rods are connected with the supporting frames through bearings, and a casting channel is arranged below the front end of the limiting barrel. According to the scheme, the problem that the sand mold casting pouring device cannot be flexibly adjusted according to the positions of different sprues on a sand core is solved.

The invention belongs to the field of alloy casting processing, and provides a full-automatic intelligent sand mold gravity casting device for magnesium alloy large products and a casting method. The full-automatic intelligent sand mold gravity casting device comprises a working platform, a mold assembling assembly, a trackless trolley and an environment-friendly air draft assembly. The mold packaging assembly comprises a movable mold trolley, a lifting assembly, a sand mold and a sprue cup with multiple sprues; the trackless trolley is integrated with a turnover casting assembly (comprising a crucible turnover structure driven by a servo motor) and a manipulator detection assembly (comprising a quick-release detection plate, a plugging plate, a downward detection head and a flame-retardant powder injector head). Manual casting is replaced by full-automatic operation, the problems that an existing process is poor in safety, low in detection precision, tedious in operation and insufficient in environmental protection performance are solved, meanwhile, the casting efficiency and the product percent of pass are improved, and the casting requirements of large magnesium alloy pieces of multiple specifications are met.

This invention relates to a mold-removing and mold-shifting device and its working method in an iron mold sand casting production line, belonging to the field of machinery. This invention realizes the iron mold / model and the mold-moving / molding separation operations through a mold conveying unit mechanism; it realizes the conveying operation of the iron mold through a mold conveying unit mechanism; and it realizes the mold-removing / molding separation of the iron mold and model, and the mold-shifting and mold-shifting operations through a mold-removing / molding-shifting unit mechanism. This invention can complete the mold-removing separation between multiple types of iron molds and their corresponding models, and the mold-shifting and mold-shifting transport of the iron molds in the production line after mold-removing separation. This allows the iron molds and models to be transported parallel to each other, meeting the logistics transport needs of a multi-variety large casting iron mold sand casting production line. It achieves mechanized, automated, and intelligent production of multi-variety small-batch large casting iron mold sand casting, with low manufacturing costs.

The application provides a resin sand casting method of a bridge housing casting, belongs to the casting technical field, and the casting method comprises casting and process design, mold and sand core manufacturing, closing and pouring preparation, smelting and pouring, cooling, sand falling and cleaning, heat treatment and finishing, and old sand regeneration. The casting resin sand comprises water-washed quartz sand, biomass modified furan resin, HTAM high-temperature-resistant and migration-resistant modifier, p-toluenesulfonic acid, aluminum dihydrogen phosphate, lactic acid, ammonium bicarbonate, polystyrene, expandable graphite, silane coupling agent, mica powder, calcined kaolin and spodumene powder. The biomass modified furan resin is prepared by the reaction of furfuryl alcohol, bio-based polyol, urea, phenol and p-toluenesulfonic acid and the addition of KH-550. The HTAM high-temperature-resistant and migration-resistant modifier is prepared by the reaction of KH-570 modified activated ceramic microbeads, pyromellitic dianhydride and 4,4'-diamino diphenyl ether and heat treatment.

The utility model relates to the technical field of core making equipment, and discloses core making equipment for sand mold casting, which comprises a core making box and a molding sand box, the molding sand box is arranged in the core making box, a servo motor is arranged at the lower part of one side of the core making box, and a screw rod assembly is arranged on the bottom surface in the core making box. A servo motor is arranged in the core making box, an output rod of the servo motor rotationally penetrates through the core making box to be connected to the input end of the lead screw assembly, and clamping plates are symmetrically fixed to the output end of the lead screw assembly. The air permeability can be guaranteed, the strength of the molding sand can be guaranteed, the problem that the molding sand prepared by existing core making equipment for sand mold casting is poor in air permeability or insufficient in strength is solved, and the situation that the molding sand does not have air permeability due to repeated pressing is avoided.

The utility model discloses a sand casting mold convenient for positioning a sand box. A convex mold is arranged on the upper surface of a mold table, an end part fixing limiting block is arranged at one end of the upper surface of the mold table, a side edge fixing limiting block is arranged on one side of the upper surface of the mold table, and a plurality of fixed semi-ring bodies are arranged on one side, far away from the side edge fixing limiting block, of the mold table; the movable limiting piece is movably arranged on the side, located on the fixed semi-ring body, of the die table, the movable limiting piece is in threaded fit with the adjusting screw rod, and the end of the adjusting screw rod is in rotating fit with the fixed semi-ring body and the semi-ring body gland through the limiting ring. The movable limiting piece can move through cooperation of the adjusting screw rod, after the sand box is used for a long time and deforms, the sand box which slightly deforms can be continuously used by moving the movable limiting piece, the situation that the sand box cannot be used due to deformation of the sand box is avoided, flexibility and applicability are greatly improved, and cost is saved.