43results about How to "Eliminate shrinkage defects" patented technology

The invention discloses a casting system capable of eliminating detects of a ZG35 valve casting and a design method thereof. The casting system comprises risers, a gating system and a chilling block. The gating system adopts a step-type gating system and comprises a sprue cup, a straight gate, a bottom layer ingate and an upper layer ingate. The sprue cup is used for pouring of molten metal liquid and connected with the straight gate. The straight gate is connected with the bottom layer ingate and the upper layer ingate. The chilling block is arranged at a hot spot at the bottom of the casting. The risers comprise the top risers and the side riser. The top risers are arranged over a flange on the top of the casting, and the side riser is arranged on the side face of a flange at the bottom of the casting. According to the casting system, the defects of shrinkage, dispersed shrinkage and cracking of the ZG35 valve casting can be effectively eliminated, the rate of finished products is increased, and mechanical performance of the ZG35 valve casting is improved.

The invention discloses a sand mould manufacturing assembly and a casting method and belongs to the field of casting. The sand mould manufacturing assembly comprises a mould main body, a chiller, a locating pillar and multiple support pillars, wherein the locating pillar is fixed to the upper surface of the mould main body. A through hole is formed in the chiller. The chiller is arranged at the outer side of the locating pillar in a sleeving manner through the through hole. The bottom of the chiller is supported by the support pillars. A space for sand coverage is formed between the chiller and the mould main body. Coverage sand is used for delaying chilling of the chiller when sand mould casting is conducted so that gas can be exhausted in the casting process. The upper end of the locating pillar is flush with a through hole opening of the chiller or extends out of the through hole. By means of a sand mould manufactured through the sand mould manufacturing assembly, the chilling effect of the chiller and the gas exhausting effect of the through hole in the chiller can be achieved conveniently in the casting process; the shrinkage porosity defect and the air hole defect of a casting obtained through manufacturing can be avoided; air tightness of the casting is improved, and the production qualification rate of the casting is increased.

The invention discloses an investment casting pouring method of a thin-wall aluminum alloy casting. In the method, before casting pouring, a formwork is heated to a relatively high temperature (700+ / -50 DEG C), so that the cooling speed of alloy liquid is reduced, and the alloy liquid can completely fill a formwork cavity for sure so as to obtain a casting with a qualified shape; and moreover, the poured casting is taken out of the formwork and then immediately put on a cooling bracket to be forcibly and quickly cooled, and thus the defects of pinholes and shrinkage porosity of the casting can be eliminated.

The invention relates to an extrusion die casting method for a thin-wall aluminum alloy automobile engine pump body cover. The method is suitable for obtaining the automobile engine pump body cover which is good in gas tightness and compactness, high in product qualified rate, complex in shape structure and thin in wall. The extrusion die casting method comprises an extrusion die casting step, wherein a quantitative pouring cup is adopted to convey aluminum base alloy melt into a material cylinder chamber of a die casting machine from a heat preservation furnace; a punch of the extrusion die casting machine smoothly propels the aluminum base alloy melt into a die cavity; the process of propelling the aluminum base alloy melt comprises three stages in sequence: according to the first stage, the punch is propelled at extrusion die casting speed, the propelling stroke accounts for 50 percent to 60 percent of the full stroke, and therefore air in a material cylinder runs away, the alloy melt slowly enters the middle segment of the die cavity, and the air runs away and air wrapping is reduced; according to the second stage, the punch is propelled at the die casting speed of a horizontal die casting machine, the propelling stroke accounts for 33 percent to 43 percent of the full stroke, pressing injection is rapidly carried out, and therefore mold filling is completely carried out on the product, and the cold shut is solved through rapid forming; and according to the third stage, pressure maintaining and feeding are carried out, and therefore crystalline grains are compacted, and a casting workblank is obtained.

The invention relates to the field of titanium alloy casting, particularly to a casting technological method of a graphite titanium alloy casting. The casting technological method comprises the stepsof acquiring an optimal casting angle according to a three-dimensional digital model of the graphite titanium alloy casting by virtue of Huazhu CAE simulation software; then, parting a pouring gate digital model established based on the optimal casting angle; processing graphite into graphite theoretical casting molds, carrying out degassing treatment, splicing the graphite theoretical casting molds, and carrying out vacuum inclined centrifugal casting, so as to obtain the graphite titanium alloy casting. According to the casting technological method, fall flow of molten titanium can be effectively relieved, the purpose that molten titanium sequentially solidifies is achieved, besides, inner shrinkage cavity defects of the casting are eliminated through feeding of centrifugal force, flow mark defects of the surface of the casting can be decreased as well, product quality of the titanium alloy casting is integrally improved, follow-up welding repairing trimming is reduced, the production cycle of a product is shortened, and production cost is reduced.

The invention provides a positioning chaplet for casting. The positioning chaplet comprises an upper supporting seat, a connecting rod, a lower supporting seat and a positioning pin which are sequentially connected from top to bottom, wherein the connecting rod is provided with rough threads, a combined core where the chaplet is located comprises an oil tank core, upper water jacket cores and lower water jacket cores which are sequentially arranged from top to bottom, a plurality of chaplet bodies are arranged between the oil tank core and the upper water jacket cores, a plurality of upper supporting points are arranged on the bottom surface of the oil tank core so as to be in supporting fit with the upper supporting seat in the chaplet, a plurality of lower positioning holes are formed inthe upper water jacket cores so as to be inserted and matched with the positioning pin, and the positions of the lower positioning holes are preferably selected as the positions of hot joints in theupper water jacket cores. According to the design, the structure is simple, the positioning effect is good, the heat joint distribution can be reduced, and the shrinkage defect can be eliminated.

The invention discloses a casting method of a valve cover casting. The method concretely comprises the following steps: 1, designing a technology and dies according to a proportional solidification technology, and making a lower type die, an upper type die and a cast die; 2, shooting on corresponding hot core box shooters to make a lower type sand core, an upper type sand core and a cast sand core; and 3, trimming and assembling the above sand cores, tightly clamping the assembled sand cores with a clamp, and carrying out cast molding to obtain the valve core casting. The valve cover casting has a high coated die sand mold surface hardness, can fully perform the graphitization expansion in nodular cast iron to carry out self-feeding, and adopts hot side casting of a cast gate, and the cast gate which is short, thin and wide can fully perform its self-adaptive adjustment effect; the shrinkage porosity and shrinkage cavity defects are thoroughly eliminated, the cast gate which is thin has a good slag baffling effect, defects comprising slag blowholes and the like are basically eliminated, and the casting yield is above 95%; and cold iron is thoroughly removed, the operation is simple, and the production efficiency is improved to a great extent.

The invention relates to an extrusion die casting method for a thin-walled aluminum alloy automobile engine pump body cover, and the method is suitable for obtaining the automobile engine pump body cover which is good in airtightness and compactness, high in product percent of pass, complex in shape and structure and thin in wall. The extrusion die casting method includes the steps that a quantitative pouring cup is adopted to convey aluminum alloy liquid from a heat preservation furnace to a die-casting machine cylinder chamber, an extrusion die-casting machine punch pushes the aluminum alloy liquid steadily to a die cavity, and the aluminum alloy liquid pushing process sequentially includes three stages, namely the extrusion die casting speed, the die casting speed of a horizontal die-casting machine and pressure maintaining, shrink compensation and particle compaction, wherein in the first stage, the pushing range accounts for 50-60% the whole range, so that air in a material cylinder escapes, the alloy liquid enters the middle segment of the die cavity at a low speed, air escapes, and air trapping is reduced; in the second stage, the pushing range accounts for 33-43% the whole range, so that press-shoot is conducted rapidly, a product is fully formed in an inflatable mode, and cold shut is solved through rapid formation; in the third stage, a blank casting is obtained.

The invention relates to a running and feeding system on a DISA line for producing annular thin-wall gray iron castings and a design method of the running and feeding system. The running and feeding system comprises feeder heads and a pouring system, wherein the pouring system adopts a bottom pouring mode and comprises inner runners, a straight runner and transverse runners; two castings are distributed in each template; the two castings are symmetrically distributed by using the straight runner as an axis; the inner runners are arranged under each casting; the running and feeding is characterized in that the number of the runner under each casting is one, and the connecting position of the straight runner and the transverse runners is provided with a first buffer zone; the two inner runners are respectively communicated with the two transverse runners; a second buffer zone is arranged at one end, which is far away from the first buffer zone, of each transverse runner; the feeder heads are respectively arranged right above each casting.

The invention relates to the field of pressure casting of aluminum base alloys, in particular to a core pulling vacuum valve for die casting and an application method thereof. The core pulling vacuum valve for die casting comprises a movable module (1) and a valve rod (2), and is characterized by further comprising a valve head (3), a pressing block (4), a back base (5), an oil cylinder bracket (6), a connecting block (7) and an oil cylinder (8); the valve rod (2) is arranged in a pipe (11); the valve head (3) is provided with a connecting hole and an air extracting hole (31) communicating with the connecting hole; a back rod of the valve rod (2) is sleeved in the connecting hole of the valve head (3); a front rod of the valve rod (2) is provided with an exhaust port; and the back rod of the valve rod (2) is butted against the wall of the connecting hole of the valve head (3) through the pressing block (4). The application method of the core pulling vacuum valve for die casting is characterized by being performed according to the following steps: die casting preparation; pressing injection; cooling mold opening; and reuse. The core pulling vacuum valve for die casting is large in exhaust section area and high in casting quality.

The invention discloses a mold for a container corner pieces casting technology. The mold comprises upper sand shells, lower sand shells and a gating system, wherein the gating system is arranged in the middle of the upper sand shells and penetrates the upper sand shells to the lower sand shells, and the upper sand shells and the lower sand shells are encircled to form a plurality of corner piecestype containing cavities with the gating system as a central axis; the gating system comprises a straight sprue, and first sprue gatings, second sprue gatings and a casting head are arranged sequentially on the straight sprue from bottom to top, wherein the first sprue gatings correspondingly communicate with each corner piece type containing cavity in the lower sand shells, the second sprue gatings correspondingly communicate with each corner piece type containing cavity in the upper sand shells, and the casting head is used for injecting molten steel. The mold for the container corner pieces casting technology has the beneficial effects that the first sprue gatings and the second sprue gatings are formed, so that the distance and the range which the first sprue gatings and the second sprue gatings pass through feeding are increased; and meanwhile, the machining amount of the hole-free large surface is increased in an auxiliary mode, the feeding is effectively carried out on a isolated hot pot, and the hole shrinkage defect is eliminated.

The invention discloses a rapid wheel forming device and method based on multiple lift tubes. The multiple lift tubes are arranged in a melt heat preserving furnace connected with a gas source, the upper portions of the lift tubes are connected with a sprue of a mold through a heat preserving cup and a sprue brush, the lower portions of the lift tubes are immersed in metal melt, when gas pressureis adopted for carrying out pressurizing on the metal melt in the furnace, the melt can rise along the lift tubes, and enters a mold cavity through the sprue, the sprue of the mold is arranged on thering face under a rim of a wheel, meanwhile, the invention discloses a mold filling solidification pressurizing method adapting to the device, at the solidification pressure maintaining stage after mold filling is finished, high-pressure gas is adopted for carrying out pressurizing feeding on the melt on the position of the sprue, possibility of shrinkage porosity forming of a shrinkage cavity canbe removed, the mold filling distance of the metal melt is shortened by more than one half compared with an existing stage, the long-distance feeding problem of a large-size wheel can be solved, andthe wheel mechanical property can be obviously improved.

The invention discloses a casting method for a vermicular graphite cast iron cylinder cover of a diesel engine and a cold iron core support for casting. The casting method includes the steps that thecold iron core support matched with an injector hole in size is placed on an injector hole sand core, and the whole set of the sand core is placed in a molding flask of a molding line; at the set pouring temperature, molten iron is poured into the molding chamber of the sand core from a pouring cup of the molding flask according to the set pouring speed; the molding flask is opened and a casting is taken out when the shakeout time is set, and a casting system associated with the casting and casting sand attached on the surface are cleaned up; and the corresponding injector hole is machined atthe cold iron core support of the casting. During the solidification of the molten iron, the cold iron core support can fuse and absorb heat to eliminate the shrinkage porosity in the casting. A positioning core of the cold iron core support can be placed on the sand core to play a positioning role, and at the same time, the shrinkage porosity of the core of the casting can be eliminated, or the shrinkage porosity area can be controlled within a machining range, and the shrinkage porosity can be removed by a later machining process.

The invention discloses a casting method of a large-scale corrosion-resistant aluminum-magnesium alloy component. A casting device comprises a platform, the top surface of the platform is a working surface, heat preservation furnaces are arranged at the bottom of the platform, the number of the heat preservation furnace is two or more, heat preservation furnace each are connected with corresponding liquid filling openings of the working surface through mutually independent liquid lifting devices, and the heat preservation furnaces can realize asynchronous liquid lifting and pressing through aliquid lifting control system, and the casting method is characterized by comprising the following steps of (1) preparation before casting; (2) multi-zone synchronous liquid lifting; (3) second-stagepressurization solidification; and (4) pressure relief. According to the casting method, the casting effect of the large-scale corrosion-resistant aluminum-magnesium alloy component can be improved.

The invention belongs to the field of investment casting, and particularly relates to a method for solving shrinkage porosity of an investment casting aluminum alloy casting. The method comprises thefollowing steps: casting a casting by adopting an investment casting method; and carrying out air cooling on the thick and large part of the casting. According to the method, high-pressure dry air isadopted for locally and forcibly cooling the casting set, and the defect of casting shrinkage porosity of thick and large parts can be effectively overcome.

The invention relates to a method for reducing casting defect of an automobile brake caliper body. A cavity of a brake caliper body is positioned in a core box movable mould B (4), and the brake caliper body has a thermal center (8). In order to ensure the thermal center (8) is solidified firstly, the method is characterized in that a cold iron (2) is arranged between a core box movable mould A (1) and a fixed mould (3) before filling iron liquid is cast; the filling iron liquid around a cylinder bore (7) is solidified firstly under the chilling action of the cold iron after the iron liquid enters into the cavity; liquid contraction and solidification contraction appearing in the solidification process obtain sufficient supplement from a riser by a feeding channel, and finally, shrinkage holes are moved in the riser to reduce the casting defect of the brake caliper body of the automobile. The invention not only eliminates the shrinkage porosity and the shrinkage holes defect for casting, but also improves the rate of final products.

The invention provides a cooling mold and a method for cooling a steel ingot. The cooling mold comprises a pouring chassis and condensation walls, and each condensation wall comprises at least two cooling layers which are vertically arranged in sequence. The cooling mold further comprises at least two pairs of electromagnetic induction components which are arranged on the outer side of the condensation walls, each pair of the electromagnetic induction components are symmetrically arranged on the two sides of a casting cavity, and each cooling layer is provided with at least one pair of electromagnetic induction components; each electromagnetic induction component comprises at least two pairs of coils which can be connected to the corresponding condensation wall in a sliding manner, and the two coils in each pair of the coils are oppositely arranged in parallel; among all the electromagnetic induction components, at least one pair of the coils are vertically arranged, at least one pair of the coils are horizontally arranged, and all the horizontally arranged coils are located between center lines of all the vertically arranged coils; and the two ends of all the coils are sequentially opposite to each other or sequentially connected end to end to form a semi-closed or closed rectangle in an enclosing manner. According to the cooling mold, molten steel can be stirred in the horizontal direction and in the vertical direction separately, and the quality of steel ingots is improved.

The invention relates to a pouring system and a casting method for producing an annular nodular iron casting from clay sand. The technical problems that an existing pouring system and method for producing annular nodular iron castings are low in product yield, prone to generating shrinkage defects and low in comprehensive yield are mainly solved. According to the technical scheme, the pouring system comprises a straight pouring gate, a straight pouring gate nest, two filtering devices, two transverse pouring gates, an annular casting model, an inner pouring gate, an exhaust rod and an overflow column; the overflow column is arranged at the top of the annular casting model, the exhaust rod is arranged beside the top of the annular casting model, the inner side of the annular casting model is connected with one end of the ingates, the ingates are evenly arranged on the outer side of the cross gate and connected with the cross gate, and the inner side of the cross gate is connected with one side of the filtering device. The other side of the filtering device is connected with a sprue nest, the sprue nest is connected with the bottom of a sprue, and the sprue is connected with a pouring cup.

The invention discloses a casting method of an engine cylinder block integrated with a high-pressure oil pump and a cold iron core support for casting. The casting method comprises the following stepsthat the cold iron core support is installed and positioned on a cylinder block water jacket core; the cylinder block water jacket core loaded with the cold iron core support is placed at the corresponding position of a sand mold outer mold and locked; after components of casting molten iron are adjusted, the molten iron is injected into a cavity of a sand core from a pouring cup of a sand box atthe set pouring temperature according to the set pouring speed; a casting is cooled at the room temperature, and the sand box is opened and the casting is taken out at the set shakeout time; an oil pump piston assembly hole is machined in the casting; and an oil pump piston assembly is installed in the machined oil pump piston assembly hole. According to the casting method of the engine cylinderblock integrated with the high-pressure oil pump and the cold iron core support for casting, the cold iron core support can be fused when the molten iron is solidified, heat can be absorbed, and therefore the shrinkage porosity defect in the casting can be eliminated.

The invention provides an iron liquid for casting a pressure plate casting and a casting method of the pressure plate casting. The method comprises the following steps: pouring the iron liquid and an inoculant in a pressure plate casting mould, and performing heat preservation and cooling to obtain the pressure plate casting, wherein the iron liquid contains 3.1-3.2% of C, 1.75-1.85% of Si, 0.8-0.9% of Mn, greater than 0 and less than 0.05% of P, greater than 0 and less than 0.1% of S, 0.2-0.25% of Cu, 0.25-0.3% of Cr, 0.06-0.07% of Sn, greater than 0 and less than 0.02% of Ti and the balance of Fe. According to the invention, by adjusting the content of the chemical components of the iron liquid to the abovementioned range and controlling the content of titanium to below 0.02%, the shrinkage defect at the hot spot of the pressure plate casting can be eliminated so as to reduce the defective rate in production.

The invention provides a hub casting system. The exterior of a hub is structurally divided into a first step, a second step, a flange and a straight barrel in sequence, and a bearing mounting position is arranged in the hub in a penetration way, wherein a mounting groove is formed in the flange; a feeding head is arranged on the outer circle of the second step, and is connected with a straight runner through a transverse runner; a gap is formed between the root of the feeding head and the root of the flange, and is 3 to 5mm; a fracture is formed in the root of the feeding head and the second step. According to the hub casting system, the casting position of a casting is shifted to a position to be fed, that is, the feeding head is shifted to the second step on the flange, the feeding head is directly used for feeding to the second step, the straight runner and the transverse runner are continuous, and the casting is cast by virtue of the feeding head, so that the defect of shrinkage is substantially eliminated, and a result meets the requirement of a product.

The invention relates to an extrusion die casting method for a thin-wall aluminum alloy automobile engine pump body cover. The method is suitable for obtaining the automobile engine pump body cover which is good in gas tightness and compactness, high in product qualified rate, complex in shape structure and thin in wall. The extrusion die casting method comprises an extrusion die casting step, wherein a quantitative pouring cup is adopted to convey aluminum base alloy melt into a material cylinder chamber of a die casting machine from a heat preservation furnace; a punch of the extrusion die casting machine smoothly propels the aluminum base alloy melt into a die cavity; the process of propelling the aluminum base alloy melt comprises three stages in sequence: according to the first stage, the punch is propelled at extrusion die casting speed, the propelling stroke accounts for 50 percent to 60 percent of the full stroke, and therefore air in a material cylinder runs away, the alloy melt slowly enters the middle segment of the die cavity, and the air runs away and air wrapping is reduced; according to the second stage, the punch is propelled at the die casting speed of a horizontal die casting machine, the propelling stroke accounts for 33 percent to 43 percent of the full stroke, pressing injection is rapidly carried out, and therefore mold filling is completely carried out on the product, and the cold shut is solved through rapid forming; and according to the third stage, pressure maintaining and feeding are carried out, and therefore crystalline grains are compacted, and a casting workblank is obtained.

The invention provides a hub casting system. The exterior of a hub is structurally divided into a first step, a second step, a flange and a straight barrel in sequence, and a bearing mounting position is arranged in the hub in a penetration way, wherein a mounting groove is formed in the flange; a feeding head is arranged on the outer circle of the second step, and is connected with a straight runner through a transverse runner; a gap is formed between the root of the feeding head and the root of the flange, and is 3 to 5mm; a fracture is formed in the root of the feeding head and the second step. According to the hub casting system, the casting position of a casting is shifted to a position to be fed, that is, the feeding head is shifted to the second step on the flange, the feeding head is directly used for feeding to the second step, the straight runner and the transverse runner are continuous, and the casting is cast by virtue of the feeding head, so that the defect of shrinkage is substantially eliminated, and a result meets the requirement of a product.

The invention relates to a main valve body for excavator grab bucket control. Seven horizontal main runners are designed in the main valve body, three horizontal main runners are designed above the main valve body, two horizontal main runners are designed in the middle of the main valve body, two horizontal main runners are designed under the main valve body, longitudinal runners are designed on the right sides of the two horizontal main runners on the lower parts and are located under the two horizontal main runners in the middle, and horizontal side runners are designed on the rear sides ofthe two horizontal main runners in the middle. The main valve body for excavator grab bucket control has the advantages that the main valve body is compact in design structure and convenient to produce, the product material is QT550-3(0596A) Carter, the tensile strength is larger than or equal to 520Mpa, the yield strength is larger than or equal to 340Mpa, the hardness is HB187-255, the nodulizing grade is three grades, and the unit weight is 65Kg.

The invention provides a cooling mold and a method for cooling a steel ingot. The cooling mold includes a casting chassis and a condensation wall, and the condensation wall includes at least two cooling layers arranged in sequence along the vertical direction; the cooling mold also includes at least two pairs arranged outside the condensation wall. Electromagnetic induction components, each pair of electromagnetic induction components are symmetrically arranged on both sides of the casting cavity, and at least one pair of electromagnetic induction components are respectively set on each cooling layer; each electromagnetic induction component includes at least two pairs of slidably connected to the condensation wall Coils, two coils in each pair of coils are parallel and oppositely arranged; in each electromagnetic induction component, at least one pair of coils is arranged vertically, and at least one pair of coils is arranged horizontally, and each of the horizontally arranged coils is located at the edge of each of the vertically arranged coils. Between the center lines; the two ends of each coil are opposite or connected in turn, forming a semi-closed or closed rectangle respectively. The invention can stir the molten steel from the horizontal and vertical directions respectively, thereby improving the quality of the steel ingot.

The invention discloses a novel follow-up small chilling block application process for an automobile engine crankshaft. A crankshaft P1 connecting rod, a follow-up small chilling block, a follow-up small chilling block manufacturing mold, a mold structure of the follow-up small chilling block on a P1 connecting rod lower mold and a mold structure of the follow-up small chilling block on a P1 connecting rod upper mold. The application process has the beneficial effects that the crankshaft casting modulus is 8.5 mm, the casting modulus of the corresponding P1 connecting rod position is 10.3 mm, and the inner side of the machined crankshaft P1 connecting rod has the micro shrinkage porosity defect; the shrinkage porosity defect of a machining shrinkage cavity of the crankshaft P1 connecting rod position is perfectly overcome through the use of the follow-up small chilling block; the follow-up small chilling block is arranged corresponding to the crankshaft P1 connecting rod position in the technological structure, the piece weight of the follow-up small chilling block is 0.04 Kg, according to the parting requirement of the crankshaft P1 connecting rod, a crankshaft mold is divided into an upper part and a lower part, namely a mold structure positioning part located on the crankshaft lower mold and a mold structure direct contact part with the P1 connecting rod at the crankshaft upper mold.

The invention discloses a shell roasting method of precision steel casting progressive solidification, comprising the following steps of: firstly, roasting and tapping a shell with an inner cavity structure; next, after insulating materials are plugged into a hole which is arranged on the shell of an inner cavity part of a casting piece and is communicated with the outside, placing the shell into a roasting furnace and heating, and taking out the shell after being heated for 15-30 minutes. The shell roasting method is used for heating the shell in a cold-interior and hot external mode, improves the sequence of solidifying processes of molten metal, roasts the shell for the same riser design, can eliminate the defect of the local shrinkage of the inner cavity of the casting piece and increases riser feeding efficiency.

The invention discloses a shell roasting method of precision steel casting progressive solidification, comprising the following steps of: firstly, roasting and tapping a shell with an inner cavity structure; next, after insulating materials are plugged into a hole which is arranged on the shell of an inner cavity part of a casting piece and is communicated with the outside, placing the shell intoa roasting furnace and heating, and taking out the shell after being heated for 15-30 minutes. The shell roasting method is used for heating the shell in a cold-interior and hot external mode, improves the sequence of solidifying processes of molten metal, roasts the shell for the same riser design, can eliminate the defect of the local shrinkage of the inner cavity of the casting piece and increases riser feeding efficiency.

The invention discloses a casting process of a cast iron grinding ball. The casting process includes the following steps that 1, an insulating sleeve serving as a runner opening is made of an insulating refractory material, and the insulating sleeve is dried for standby application; 2, the dried insulating sleeve is arranged in a sprue of a metal die before pouring is conducted; 3, pouring is conducted, wherein pouring can be stopped when a cavity and the insulating sleeve are filled with molten iron; 4, drawing is conducted, wherein drawing can be conducted when the molten iron is completely solidified. By the adoption of the process, the hardness of the cast iron grinding ball can be guaranteed, and the defect of shrinkage porosity of the core of a sphere can be eliminated.