CN110640082B - Sand box casting method - Google Patents
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- CN110640082B CN110640082B CN201911089747.8A CN201911089747A CN110640082B CN 110640082 B CN110640082 B CN 110640082B CN 201911089747 A CN201911089747 A CN 201911089747A CN 110640082 B CN110640082 B CN 110640082B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C21/00—Flasks; Accessories therefor
- B22C21/12—Accessories
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Abstract
The invention belongs to the technical field of casting forming, and particularly relates to a sand box casting method and a casting sand box, wherein the casting sand box comprises a box body; a group of heat dissipation holes are formed in the periphery of the side face of the box body, and a pair of lifting hanging columns are arranged on the left side and the right side of the box body; a sand mold upper mold and a sand mold lower mold are arranged in the box body, and cavities are arranged in the sand mold upper mold and the sand mold lower mold; the top of the upper sand mold is provided with a pair of casting holes communicated with the cavity, and the top of the upper sand mold is uniformly provided with a group of air holes; an annular sealing ring is arranged at the top of the lower sand mold and at the position corresponding to the edge of the cavity, and the sealing ring is made of a high-temperature-resistant micro-expansion material; according to the invention, the sealing ring slightly expands after being heated, so that the gap between the upper sand mold and the lower sand mold is reduced, the flash of the cast casting is reduced, the surface quality of the casting is improved, the polishing process can be reduced when the casting with low surface quality requirement is cast, and the production efficiency of the casting is improved.
Description
Technical Field
The invention belongs to the technical field of casting forming, and particularly relates to a sand box casting method and a casting sand box.
Background
Casting is a process of casting metal parts or molding cement slabs and concrete structures by pouring molten metal, concrete, or the like into a mold.
In the casting forming process, casting liquid flows in the casting cavity, so that the casting cavity is filled, and then the casting cavity is cooled to form a casting blank. In the casting forming process, when the fluidity of some casting liquid is poor, the environmental temperature is low, the heat preservation effect of a mould is poor or a casting cavity has a sharp part, the casting liquid can not fill the casting cavity, so that a pit is formed on the local surface of a casting blank formed by casting, and even the shape of the casting blank is not consistent with the shape of the casting cavity after forming. Meanwhile, a large amount of flash needs to be processed after the casting of the casting is finished due to gaps of the casting cavity, so that the surface quality and the production efficiency of the casting are reduced.
Disclosure of Invention
The invention provides a sand box casting method and a sand box, aiming at overcoming the defects of the prior art and solving the problems that when the fluidity of some casting liquid is poor, the environmental temperature is low, the heat preservation effect of a mould is poor or a casting cavity has a sharp part, the casting liquid can not fill the casting cavity, so that a pit is formed on the surface of a casting blank formed by casting, even the formed shape is inconsistent with the shape of the casting cavity, and simultaneously, a large amount of flash is required to be processed after the casting of the casting due to the gap of the casting cavity, so that the surface quality and the production efficiency of the casting are reduced.
The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a sand box casting method, which comprises the following steps:
s1, casting: pouring the liquid metal raw material into a tundish of a casting device, wherein the liquid metal raw material in the tundish flows out of a discharge hole of the tundish and then flows into a solidification forming device below a discharge end of a casting pipe through the casting pipe; the solidification forming device comprises a sand mold, a cavity is arranged in the sand mold, and liquid metal raw materials flowing out of the discharge end of the casting pipe enter the cavity in the sand mold;
s2, solidification and forming: the liquid metal raw material is gradually cooled in the cavity; after the liquid metal raw material in the cavity is solidified and formed, separating the solidified and formed casting product from the cavity, and dropping the casting product separated from the cavity into a material receiving and conveying device below the cavity;
s3, material receiving and screening: the material receiving and conveying device receives the cast molding product and screens out chips and powder mixed in the cast molding product;
a casting flask adapted for use in the above casting method, the casting flask comprising a box body; a group of heat dissipation holes are formed in the periphery of the side face of the box body, and a pair of lifting hanging columns is arranged on the left side and the right side of the box body; a sand mold upper die and a sand mold lower die are arranged in the box body, and cavities are arranged in the sand mold upper die and the sand mold lower die; the top of the upper sand mold is provided with a pair of casting holes communicated with the cavity, and the top of the upper sand mold is uniformly provided with a group of air holes; an annular sealing ring is arranged at the position, corresponding to the edge of the cavity, of the top of the sand mold lower die, and is made of a high-temperature-resistant micro-expansion material; the gap between the upper sand mold and the lower sand mold is reduced through the sealing ring, so that the flash of a cast product is reduced; in the process of manufacturing the upper sand mold and the lower sand mold, the sealing ring communicated model is placed together, then molding sand is paved and compacted, then the model is taken out to form a cavity, the sealing ring is embedded into the molding sand at the edge of the cavity, then the upper sand mold and the lower sand mold are closed and locked during casting of a casting, then liquid metal is cast after the cavity is preheated, at the moment, the sealing ring slightly expands after being heated, so that the gap between the upper sand mold and the lower sand mold is reduced, further, the flash of the casting finished through casting is reduced, the surface quality of the casting is improved, the polishing process can be reduced when the casting with low surface quality requirement is cast, and the production efficiency of the casting is improved.
Preferably, a protective layer is arranged on the periphery of the sealing ring, and thermoplastic rubber is filled in an annular cavity between the protective layer and the sealing ring; a group of overflow holes are uniformly distributed on the circumference of the protective layer; hot plastic enters the sand mold when the cavity is preheated, so that sand inclusion of a cast product is reduced; when the die cavity preheats, the die cavity temperature risees for the thermoplastic resin in the annular chamber is heated the back and is melted, the thermoplastic resin after melting permeates into in the near molding sand of sealing washer after flowing out from the spill hole, later make the thermoplastic resin solidify with the molding sand sintering after the die cavity temperature continues to rise, and then increase the intensity of the sand mould of die cavity seam crossing, and then drop to the die cavity after the gravel pine that reduces the sand mould takes off, cause foundry goods sand inclusion, reduce foundry goods surface quality, influence the foundry goods qualification rate.
Preferably, a group of fixing rods are uniformly distributed on the periphery of the protective layer and used for enhancing the strength of the sand mold, so that the sealing property between the upper mold and the lower mold of the sand mold is improved, and the flash of a cast product is further reduced; the molding sand that vibrates is closely knit in the skeleton cooperation that forms through the dead lever, the closely knit degree and the intensity of the sand mould at die cavity edge further increase, take out the damage of model in-process to the die cavity edge after reducing the die cavity preparation, reduce the box simultaneously and carry or the influence of the vibration that the compound die in-process produced to the die cavity, further reduce the double-layered sand of foundry goods, guarantee simultaneously that mould and sand mould contact closely spent between the lower mould, further reduce the overlap of the foundry goods of casting completion, improve foundry goods production efficiency.
Preferably, one end of the fixing rod, which is far away from the protective layer, is provided with a snake-shaped bend, so that the fixing effect on the sand mold is further increased; the fixed rod is hollow and is communicated with the annular cavity, so that the penetration depth of the thermoplastic in the sand mold is increased, and the flash of a cast product is further reduced; through snakelike crooked dead lever end, further increase the frictional force of dead lever and molding sand, and then increase the intensity of the sand mould at die cavity edge, simultaneously because the dead lever be hollow and with annular chamber communicating pipe, partly be heated melt back through the hollow dead lever flow direction sand mould of thermoplastic inside, further increase the penetration depth of thermoplastic in the sand mould, and then further reduce the overlap of casting shaping product.
Preferably, a group of overflow holes are formed in the edge of the bottom of the cavity of the lower sand mold, and one ends, far away from the cavity, of the overflow holes are communicated with a spherical cavity; the middle part of the spherical cavity is provided with a heat conducting plate with higher heat conductivity coefficient; an expansion hole is formed in the sealing ring and is communicated with the annular cavity through a group of vent holes; the cavity of the spherical cavity above the heat conducting plate is communicated with the expansion hole through a communication hole; compressed air generated by heating the spherical cavity accelerates the penetration of the thermoplastic into the sand mold, so that the flash of a cast product is further reduced; through overflow hole cooperation spherical chamber, make the impurity that the liquid metal head that flows into the die cavity carried flow into in the spherical chamber, further reduce the impurity content in the foundry goods, increase the qualification rate of foundry goods, spherical chamber is heated the back simultaneously, make the air in the cavity of heat-conducting plate top expand after being heated, expanded air passes through the intercommunicating pore and gets into in the inflation hole, make the sealing washer continue to expand, further reduce mould on the sand mould and the clearance between the sand mould lower mould, and then reduce the overlap of the foundry goods that the casting was accomplished, simultaneously unnecessary air is spout in the cavity of dead lever is followed to the annular chamber, and then increased the infiltration rate of hot plastic in the sand mould in the annular chamber, further increase the intensity of sand mould, and then improve foundry goods production efficiency.
Preferably, the tail end of the fixing rod close to one side of the edge of the cavity is provided with a top cap, and the distance between the sealing ring and the edge of the cavity is controlled by matching the top cap with the fixing rod, so that the flash of a cast product is further reduced; in the process of manufacturing the cavity, the top cap is tightly attached to the edge of the mold, and the fixing rod is matched to control the equal distance between the sealing ring and the edge of the cavity, so that the sealing performance of the sealing ring is improved, the height of cast fins is reduced, the surface quality of the cast is further improved, and the production efficiency of the cast is improved.
The invention has the following beneficial effects:
1. according to the sand box casting method and the casting sand box, in the process of manufacturing the upper sand mould and the lower sand mould, the sealing ring is communicated with the mould and placed together, then the moulding sand is paved and compacted, then the mould is taken out to form the cavity, at the moment, the sealing ring is embedded into the moulding sand at the edge of the cavity, then, when a casting is cast, the upper sand mould and the lower sand mould are matched and locked, then, the cavity is preheated, and then liquid metal is cast, at the moment, the sealing ring slightly expands after being heated, so that the gap between the upper sand mould and the lower sand mould is reduced, the flash of the cast casting is reduced, the surface quality of the casting is improved, when the casting with low surface quality requirement is cast, the polishing process can be reduced, and the production efficiency of the.
2. According to the sand box casting method and the casting sand box, when the cavity is preheated, the temperature of the cavity rises, so that the thermoplastic resin in the annular cavity is heated and then melted, the melted thermoplastic resin flows out of the overflow hole and then permeates into the molding sand near the sealing ring, and then the temperature of the cavity continues to rise, so that the thermoplastic resin and the molding sand are sintered and solidified, the strength of the sand mold at the joint of the cavity is increased, the phenomenon that the sand gravel of the sand mold falls into the cavity after loosening is reduced, sand inclusion of the casting is caused, the surface quality of the casting is reduced, and the qualification rate of the casting is influenced.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a perspective view of a casting flask of the present invention;
FIG. 3 is a partial cross-sectional view of a casting flask of the present invention;
FIG. 4 is an enlarged view of a portion of FIG. 3 at A;
FIG. 5 is a schematic view of the construction of the seal ring of the present invention;
in the figure: the device comprises a box body 1, heat dissipation holes 11, a lifting hanging column 12, an upper sand mold 13, a lower sand mold 14, a cavity 15, a casting hole 16, a vent hole 17, a sealing ring 2, a protective layer 21, an annular cavity 22, an overflow hole 23, a fixing rod 24, an overflow hole 3, a spherical cavity 31, a heat conduction plate 32, an expansion hole 25, a vent hole 26 and a top cap 27.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 5, the flask casting method of the present invention includes the steps of:
s1, casting: pouring the liquid metal raw material into a tundish of a casting device, wherein the liquid metal raw material in the tundish flows out of a discharge hole of the tundish and then flows into a solidification forming device below a discharge end of a casting pipe through the casting pipe; the solidification forming device comprises a sand mold, a cavity is arranged in the sand mold, and liquid metal raw materials flowing out of the discharge end of the casting pipe enter the cavity in the sand mold;
s2, solidification and forming: the liquid metal raw material is gradually cooled in the cavity; after the liquid metal raw material in the cavity is solidified and formed, separating the solidified and formed casting product from the cavity, and dropping the casting product separated from the cavity into a material receiving and conveying device below the cavity;
s3, material receiving and screening: the material receiving and conveying device receives the cast molding product and screens out chips and powder mixed in the cast molding product;
a casting flask suitable for use in the above casting method, the casting flask comprising a flask body 1; a group of heat dissipation holes 11 are formed in the periphery of the side face of the box body 1, and a pair of lifting hanging columns 12 are arranged on the left side and the right side of the box body 1; a sand mold upper mold 13 and a sand mold lower mold 14 are arranged in the box body 1, and cavities 15 are arranged in the sand mold upper mold 13 and the sand mold lower mold 14; the top of the upper sand mold 13 is provided with a pair of casting holes 16 communicated with the cavity 15, and the top of the upper sand mold 13 is uniformly provided with a group of air holes 17; an annular sealing ring 2 is arranged at the top of the sand mold lower die 14 and at the position corresponding to the edge of the cavity 15, and the sealing ring 2 is made of a high-temperature-resistant micro-expansion material; the gap between the upper sand mold 13 and the lower sand mold 14 is reduced through the sealing ring 2, so that the flash of a cast product is reduced; in the process of manufacturing the upper sand mold 13 and the lower sand mold 14, the sealing ring 2 is communicated with the mold and then molding sand is paved and compacted after the mold is placed together, then the mold is taken out to form the cavity 15, at the moment, the sealing ring 2 is embedded into the molding sand at the edge of the cavity 15, then when a casting is cast, the upper sand mold 13 and the lower sand mold 14 are matched and locked, then liquid metal is cast after the cavity 15 is preheated, at the moment, because the sealing ring 2 is slightly expanded after being heated, the gap between the upper sand mold 13 and the lower sand mold 14 is reduced, the flash of the cast finished casting is reduced, the surface quality of the casting is improved, the polishing process can be reduced when the casting with low surface quality requirement is cast, and the production efficiency of the casting is.
As an embodiment of the invention, a protective layer 21 is arranged on the periphery of the sealing ring 2, and a cavity 22 between the protective layer 21 and the sealing ring 2 is filled with thermoplastic; a group of overflow holes 23 are uniformly distributed on the circumference of the protective layer 21; hot plastic enters the sand mold when the cavity 15 is preheated, so that sand inclusion of a cast product is reduced; when the die cavity 15 preheats, die cavity 15 temperature risees, make the thermoplastic resin in the annular cavity 22 melt after being heated, the thermoplastic resin after melting permeates into in the molding sand near sealing washer 2 after flowing out from overflow hole 23, later make the thermoplastic resin solidify with the molding sand sintering after die cavity 15 temperature continues to rise, and then increase the intensity of the sand mould of die cavity 15 seam crossing, and then reduce the gravel pine of sand mould and take off the back and drop to die cavity 15, cause the foundry goods to press from both sides the sand, reduce foundry goods surface quality, influence the foundry goods qualification rate.
As an embodiment of the invention, a group of fixing rods 24 are uniformly distributed on the periphery of the protective layer 21, and the fixing rods 24 are used for enhancing the strength of the sand mold, so that the sealing property between the upper mold and the lower mold 14 of the sand mold is increased, and the flash of a cast product is further reduced; the molding sand that vibrates is closely knit in the skeleton cooperation that forms through dead lever 24, the closely knit degree and the intensity of the sand mould at 15 marginal die cavities further increase, reduce the damage of taking out the model in-process to 15 marginal die cavities after 15 preparation of die cavities are accomplished, reduce the influence of box 1 vibration to die cavity 15 that produces at transport or compound die in-process simultaneously, further reduce the double-layered sand of foundry goods, guarantee simultaneously that mould 13 is gone up in the sand mould and contact closely spent between sand mould lower mould 14, further reduce the overlap of the foundry goods of casting completion, the efficiency of casting production is improved.
As an embodiment of the present invention, one end of the fixing rod 24 away from the protective layer 21 is provided with a serpentine bend, so as to further increase the fixing effect on the sand mold; the fixing rod 24 is hollow and is communicated with the annular cavity 22, so that the penetration depth of the thermoplastic in the sand mold is increased, and the flash of a cast molding product is further reduced; through the 24 ends of the dead lever of snakelike crooked, further increase the frictional force of dead lever 24 and molding sand, and then increase the intensity of the sand mould at die cavity 15 edge, simultaneously because dead lever 24 be hollow and with annular chamber 22 communicating pipe, partly be heated and melt the back through the hollow dead lever 24 flow direction sand mould of thermoplastic inside, further increase the depth of penetration of thermoplastic in the sand mould, and then further reduce the overlap of casting shaping product.
As an embodiment of the invention, a group of overflow holes 3 are formed in the edge of the bottom of the cavity 15 of the lower sand mold 14, and one end of each overflow hole 3, which is far away from the cavity 15, is communicated with a spherical cavity 31; the middle part of the spherical cavity 31 is provided with a heat conducting plate 32 with higher heat conductivity coefficient; an expansion hole 25 is formed in the sealing ring 2, and the expansion hole 25 is communicated with the annular cavity 22 through a group of vent holes 26; the cavity of the spherical cavity 31 above the heat conducting plate 32 is communicated with the expansion hole 25 through a communication hole 33; compressed air generated by heating the spherical cavity 31 accelerates the penetration of the thermoplastic into the sand mold, thereby further reducing the flash of the cast product; through overflow hole 3 cooperation spherical cavity 31, make the impurity that the liquid metal head that flows into die cavity 15 carries flow into spherical cavity 31, further reduce the impurity content in the foundry goods, increase the qualification rate of foundry goods, spherical cavity 31 is heated the back simultaneously, make the air in the cavity of heat-conducting plate 32 top expand after being heated, expanded air passes through the intercommunicating pore 33 and gets into in the inflation hole 25, make sealing washer 2 continue to expand, further reduce the clearance between mould 13 on the sand mould and the sand mould lower mould 14, and then reduce the overlap of the foundry goods of casting completion, simultaneously unnecessary air is spout in the cavity of annular chamber 22 follow dead lever 24, and then increased the infiltration rate of hot plastic in the annular chamber 22 in the sand mould, further increase the intensity of sand mould, and then improve foundry goods production efficiency.
As an embodiment of the invention, the end of the fixing rod 24 close to one side of the edge of the cavity 15 is provided with a top cap 27, and the distance between the sealing ring 2 and the edge of the cavity 15 is controlled by matching the top cap 27 and the fixing rod 24, so that the flash of a cast product is further reduced; in the process of manufacturing the cavity 15, the top cap 27 is tightly attached to the edge of the mold, and the fixing rod 24 is matched to control the equal distance between the sealing ring 2 and the edge of the cavity 15, so that the sealing performance of the sealing ring 2 is improved, the height of cast flashes is reduced, the surface quality of the cast is further improved, and the production efficiency of the cast is improved.
During the operation, in the process of manufacturing the upper sand mold 13 and the lower sand mold 14, the sealing ring 2 is communicated with the mold and placed together, then molding sand is paved and compacted, then the mold is taken out to form the cavity 15, at the moment, the sealing ring 2 is embedded into the molding sand at the edge of the cavity 15, then, when casting a casting, the upper sand mold 13 and the lower sand mold 14 are matched and locked, then, liquid metal is cast after preheating the cavity 15, at the moment, because the sealing ring 2 slightly expands after being heated, the gap between the upper sand mold 13 and the lower sand mold 14 is further reduced, the flash of the cast casting is further reduced, the surface quality of the casting is improved, when the casting with low surface quality requirement is cast, the polishing process can be reduced, and the production efficiency of the casting is improved; when the cavity 15 is preheated, the temperature of the cavity 15 rises, so that the thermoplastic in the annular cavity 22 is heated and then melted, the melted thermoplastic flows out of the overflow hole 23 and then permeates into the molding sand near the sealing ring 2, and then the temperature of the cavity 15 continues to rise, so that the thermoplastic and the molding sand are sintered and cured, the strength of the sand mold at the joint of the cavity 15 is increased, the sand of the sand mold falls into the cavity 15 after being loosened, sand inclusion of the casting is caused, the surface quality of the casting is reduced, and the qualified rate of the casting is influenced; the framework formed by the fixing rods 24 is matched with the compact and vibrated molding sand, so that the compactness and strength of the sand mold at the edge of the cavity 15 are further increased, the damage to the edge of the cavity 15 in the process of taking out the mold after the cavity 15 is manufactured is reduced, the influence of vibration generated in the carrying or mold closing process of the box body 1 on the cavity 15 is reduced, the sand inclusion of the casting is further reduced, the contact tightness between the upper mold 13 and the lower mold 14 of the sand mold is ensured, the flash of the cast casting is further reduced, and the production efficiency of the casting is improved; the friction force between the fixing rod 24 and the molding sand is further increased through the tail end of the fixing rod 24 which is bent in a snake shape, so that the strength of the sand mold at the edge of the cavity 15 is increased, meanwhile, as the fixing rod 24 is hollow and is communicated with the annular cavity 22, a part of the fixing rod flows into the sand mold through the hollow fixing rod 24 of the thermoplastic after being heated and melted, so that the penetration depth of the thermoplastic in the sand mold is further increased, and the flash of a cast molding product is further reduced; the overflow holes 3 are matched with the spherical cavity 31, so that impurities carried by the head of the liquid metal flowing into the cavity 15 flow into the spherical cavity 31, the impurity content in the casting is further reduced, the qualified rate of the casting is increased, meanwhile, after the spherical cavity 31 is heated, the air in the cavity above the heat conduction plate 32 is heated and expands, the expanded air enters the expansion hole 25 through the communication hole 33, the sealing ring 2 is continuously expanded, the gap between the upper sand mold 13 and the lower sand mold 14 is further reduced, the flash of the cast casting is further reduced, meanwhile, redundant air is sprayed out from the hollow part of the fixed rod 24 through the annular cavity 22, the permeation speed of hot plastic in the annular cavity 22 in the sand mold is further increased, the strength of the sand mold is further increased, and the production efficiency of the casting is further improved; in the process of manufacturing the cavity 15, the top cap 27 is tightly attached to the edge of the mold, and the fixing rod 24 is matched to control the equal distance between the sealing ring 2 and the edge of the cavity 15, so that the sealing performance of the sealing ring 2 is improved, the height of cast flashes is reduced, the surface quality of the cast is further improved, and the production efficiency of the cast is improved.
The front, the back, the left, the right, the upper and the lower are all based on the figure 2 in the attached drawings of the specification, according to the standard of the observation angle of a person, the side of the device facing an observer is defined as the front, the left side of the observer is defined as the left, and the like.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A sand box casting method is characterized in that: the method comprises the following steps:
s1, casting: pouring the liquid metal raw material into a tundish of a casting device, wherein the liquid metal raw material in the tundish flows out of a discharge hole of the tundish and then flows into a solidification forming device below a discharge end of a casting pipe through the casting pipe; the solidification forming device comprises a sand mold, a cavity is arranged in the sand mold, and liquid metal raw materials flowing out of the discharge end of the casting pipe enter the cavity in the sand mold of the sand box;
s2, solidification and forming: the liquid metal raw material is gradually cooled in the cavity; after the liquid metal raw material in the cavity is solidified and formed, separating the solidified and formed casting product from the cavity, and dropping the casting product separated from the cavity into a material receiving and conveying device below the cavity;
s3, material receiving and screening: the material receiving and conveying device receives the cast molding product and screens out chips and powder mixed in the cast molding product;
the sand box comprises a box body (1); a group of heat dissipation holes (11) are formed in the periphery of the side face of the box body (1), and a pair of lifting hanging columns (12) is arranged on the left side and the right side of the box body (1); a sand mold upper mold (13) and a sand mold lower mold (14) are arranged in the box body (1), and cavities (15) are arranged in the sand mold upper mold (13) and the sand mold lower mold (14); the top of the upper sand mold (13) is provided with a pair of casting holes (16) communicated with the cavity (15), and the top of the upper sand mold (13) is uniformly provided with a group of air holes (17); an annular sealing ring (2) is arranged at the position, corresponding to the edge of the cavity (15), of the top of the sand mold lower die (14), and the sealing ring (2) is made of a high-temperature-resistant micro-expansion material; the gap between the upper sand mold (13) and the lower sand mold (14) is reduced through the sealing ring (2), so that the flash of a cast product is reduced; a protective layer (21) is arranged on the periphery of the sealing ring (2), and thermoplastic gel is filled in an annular cavity (22) between the protective layer (21) and the sealing ring (2); a group of overflow holes (23) are uniformly distributed on the circumference of the protective layer (21); when the cavity (15) is preheated, hot plastic enters the sand mold, so that sand inclusion of a cast product is reduced.
2. The flask casting method of claim 1, wherein: a group of fixing rods (24) are uniformly distributed on the periphery of the protective layer (21) in the circumferential direction, and the fixing rods (24) are used for enhancing the strength of the sand mold, so that the sealing performance between the upper mold and the lower mold (14) of the sand mold is improved, and the flash of a cast product is further reduced.
3. The flask casting method of claim 2, wherein: one end of the fixing rod (24) far away from the protective layer (21) is provided with a snake-shaped bend, so that the fixing effect on the sand mold is further increased; the fixing rod (24) is hollow and is communicated with the annular cavity (22), so that the penetration depth of the thermoplastic resin in the sand mold is increased, and the flash of a cast molding product is further reduced.
4. The flask casting method of claim 2, wherein: a group of overflow holes (3) are formed in the edge of the bottom of a cavity (15) of the lower sand mold (14), and one ends, far away from the cavity (15), of the overflow holes (3) are communicated with a spherical cavity (31); a heat conducting plate (32) with higher heat conductivity coefficient is arranged in the middle of the spherical cavity (31); an expansion hole (25) is formed in the sealing ring (2), and the expansion hole (25) is communicated with the annular cavity (22) through a group of vent holes (26); the cavity of the spherical cavity (31) above the heat-conducting plate (32) is communicated with the expansion hole (25) through a communication hole (33); compressed air generated by heating the spherical cavity (31) accelerates the penetration of the thermoplastic into the sand mold, and the flash of the cast molding product is further reduced.
5. The flask casting method of claim 4, wherein: the tail end of a fixing rod (24) close to one side of the edge of the cavity (15) is provided with a top cap (27), and the distance between the sealing ring (2) and the edge of the cavity (15) is controlled by matching the top cap (27) with the fixing rod (24), so that the flash of a cast product is further reduced.
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| CN201911089747.8A CN110640082B (en) | 2019-11-08 | 2019-11-08 | Sand box casting method |
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| CN201911089747.8A CN110640082B (en) | 2019-11-08 | 2019-11-08 | Sand box casting method |
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| CN110640082B true CN110640082B (en) | 2021-04-30 |
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| CN112247104A (en) * | 2020-09-18 | 2021-01-22 | 曹光辉 | Aluminum alloy die-casting die |
| CN115255337B (en) * | 2022-09-23 | 2023-04-25 | 柳州工学院 | Casting sand box with adjustable sand casting is with assembly |
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