CN110280720B - Lost foam casting method - Google Patents
Lost foam casting method Download PDFInfo
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- CN110280720B CN110280720B CN201910696303.4A CN201910696303A CN110280720B CN 110280720 B CN110280720 B CN 110280720B CN 201910696303 A CN201910696303 A CN 201910696303A CN 110280720 B CN110280720 B CN 110280720B
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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
- B22C9/03—Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding
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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
- B22C9/04—Use of lost patterns
- B22C9/043—Removing the consumable pattern
Abstract
The invention belongs to the technical field of casting, and particularly relates to a lost foam casting method; the sand box adopted by the casting method comprises a shell, a fixing unit, a purifying unit and a sealing unit; a pouring gate is arranged on the side wall of the shell; the fixing unit is fixed on the inner side wall of the shell and comprises a first piston rod, nitrogen and a sand bag; the first piston rod is fixed on the inner side wall of the shell, and the end part of the first piston rod is spherical; the nitrogen is filled in the piston cavity of the first piston rod; the purification unit is positioned in the sand bag; the sealing unit is arranged on the outer side wall of the shell; the metal liquid is cast and molded in the sand box through the matching of the shell, the fixing unit, the purifying unit and the sealing unit; the sand box is preheated firstly, so that nitrogen in the piston cavity of the first piston rod is heated to expand, the sand bag is attached to the foam plastic model more tightly, and the quality of a product cast by the sand box is improved.
Description
Technical Field
The invention belongs to the technical field of casting, and particularly relates to a lost foam casting method.
Background
The lost foam casting is a full-mold casting of a foam plastic mold by adopting a binder-free dry sand combined vacuumizing technology, and is a novel casting method for bonding and combining foam molds with similar sizes and shapes of castings into a mold cluster, coating refractory paint on the mold cluster, drying the mold cluster, burying the mold cluster in molding sand for vibration molding, pouring under negative pressure to gasify the mold, enabling liquid metal to occupy the position of the mold, and forming the castings after solidification and cooling. At present, the standard reaching rate of the produced castings is low, and the main reason is that the joint degree of the molding sand and the foam model is not high in the casting manufacturing process, particularly for the bending part, the groove part and the hole part of the castings. In the production process to the pulley, the foam model of pulley vibrates the molding in the molding sand, and near the foam model molding sand compactness is not enough, leads to the molding of foam model in the molding sand incomplete, has reduced the pulley standard reaching rate that liquid metal pouring made.
Disclosure of Invention
The invention provides a lost foam casting method, which aims to make up for the defects of the prior art and solve the problems that the molding sand compactness near a foam model is insufficient, so that the molding of the foam model in the molding sand is incomplete, and the standard reaching rate of pulleys prepared by pouring liquid metal is reduced.
The technical scheme adopted by the invention for solving the technical problems is as follows: a lost foam casting method comprises the following steps:
s1: according to the requirements of customers on products, foam plastic models are manufactured according to an EPC process, in order to enable metal liquid to be fully filled, the surfaces of the foam plastic models are fully coated with refractory coatings, and the foam plastic models coated with the refractory coatings are placed in a drying chamber for drying treatment, so that the influence on the product quality in the casting process is prevented;
s2: paving a layer of dry sand at the bottom of a sand box used for casting, then placing the dried foam plastic model obtained in the step S1 into the sand box, and continuing to place the dry sand into the sand box after the position of the foam plastic model is fixed until the sand box is filled;
s3: performing three-dimensional vibration treatment on the sand box filled with the dry sand obtained in the step S2 to enable the dry sand in the sand box to be more compact, and continuously filling the dry sand into the sand box after the three-dimensional vibration treatment to enhance the compactness of the dry sand and improve the processing quality of the casting;
s4: vacuumizing the sand box obtained in the step S3, performing metal pouring when the vacuum degree in the sand box meets the requirement, directly gasifying the foam plastic model at high temperature, directly filling the metal liquid into the position between the foam plastic models at the moment, copying a casting which is the same as the foam plastic model, condensing the sand box after pouring, releasing vacuum, taking out the casting, and performing the next casting cycle;
wherein, the sand box comprises a shell, a fixing unit, a purifying unit and a sealing unit; a pouring gate is arranged on the side wall of the shell; the fixing unit is fixed on the inner side wall of the shell and comprises a first piston rod, nitrogen and a sand bag; the first piston rod is fixed on the inner side wall of the shell, and the end part of the first piston rod is spherical; the nitrogen is filled in the piston cavity of the first piston rod; the sand bag wraps the lower half part of the foam plastic model, and the outer side wall of the sand bag is in contact with the first piston rod; the purification unit is positioned in the sand bag; the sealing unit is arranged on the outer side wall of the shell; the metal liquid is cast and molded in the sand box through the matching of the shell, the fixing unit, the purifying unit and the sealing unit; during the use, before the pouring, preheat the sand box earlier for nitrogen gas in the piston cavity of a piston rod is heated and expanded, and is ejecting to the sand bag surface with a piston rod, makes the sand bag more inseparable with the mould laminating of bubble mould, has improved the quality of the product through the sand box casting, and the mould figurative integrity of mould in the molding sand is moulded to the reinforcing bubble, thereby improves the standard reaching rate of the product that liquid metal pouring made.
Preferably, the purification unit comprises a piston rod II; one end of the second piston rod, which is positioned outside the piston cavity, is connected to the inner side wall of the sand bag, which is close to the first piston rod, through a first spring, the other end of the second piston rod penetrates through the surface of the other side wall of the sand bag, and the end part of the piston cavity of the second piston rod is provided with an opening; the metal liquid can fully flow in the sand box through the matching of the second piston rod and the sand bag; during the use, when piston rod top to the sand bag when the sand bag warp, promote the shrinkage of No. two piston rods under the effect of a spring to absorb the produced gas through pouring the molten metal through No. two piston rods, accelerated the flow velocity of molten metal in the sand box through absorbing gas when No. two piston rods shrink, improved the speed of molten metal pouring, improve staff's work efficiency, and reduce the phenomenon that appears watering inadequately and produce, thereby further improve the quality of the product of casting out through the sand box, improve the standard reaching rate of the product of liquid metal pouring making.
Preferably, expanded graphite is arranged in the sand bag; the side wall of the second piston rod is provided with a vent hole, and when the second piston rod stretches to the longest position, the vent hole can be communicated with the piston cavity; an adsorption film is arranged on the vent hole; the purification effect of waste gas generated by casting is realized through the cooperation of the expanded graphite and the vent holes; when the gas absorption type sand bag filling machine is used, when the first piston rod is pushed to the sand bag until the sand bag deforms, the second piston rod is pushed to contract under the action of the first spring, when the second piston rod contracts to the air vent and is communicated with the piston cavity, gas absorbed by the second piston rod enters the sand bag through the air hole, wherein most of the absorbed gas is gas generated after the foam plastic model is gasified, the gas contains toxic substances, when the gas passes through an adsorption film on the air vent, preliminary purification is realized, when the gas enters the sand bag through the adsorption film, the toxic substances in the gas can be fully absorbed by expanded graphite, waste gas pollution caused by lost foam casting forming is reduced, the working environment of workers is improved, and the environment around a manufacturing site is protected.
Preferably, a sliding groove is formed in the outer side wall of the shell; the sealing unit comprises a sliding block and a plastic film; the sliding block is connected in the sliding groove in a sliding manner; the end part of the plastic film is fixed on the sliding block; the sealing effect on the sand box is realized through the matching of the plastic film and the sliding block; when the dry sand mould is used, a layer of dry sand is paved at the bottom of a sand box used for casting, then a foam mould model is placed into the sand box, and after the position of the foam mould model is fixed, the dry sand is continuously placed into the sand box until the sand box is filled; after the sand box is filled, the sand box is driven by the sliding rail to move, the sliding block is fixed by external equipment, the sliding block generates relative displacement relative to the sand box at the moment, the plastic film fixed on the sliding block is driven by the relative movement of the sliding block to generate relative movement relative to the sand box, and after the sealing treatment is carried out by workers, the sealing of the sand box is realized, the influence of impurity gas on the product quality is prevented in the casting forming process, so that the quality of the product cast by the sand box is further improved, and the standard reaching rate of the product manufactured by liquid metal pouring is improved.
Preferably, an air bag is arranged at the end part of the sliding chute; a third piston rod is fixedly connected to the side wall of the shell vertical sliding groove; the end part of the third piston rod is fixedly connected with a blade, and a piston cavity of the third piston rod is communicated with the air bag through an air pipe; the blade can be in contact with the plastic film when the third piston rod is ejected out; the sealing effect on the sand box is realized through the matching of the air bag, the third piston rod and the blade; during the use, after the sand box is filled up, the sand box moves under the drive of slide rail, and the slider is then fixed by external equipment, then the slider produces relative displacement for the sand box this moment, the relative movement of slider drives the plastic film of fixing on the slider and produces relative movement for the sand box, when the slider slided to the spout tip, the extrusion gasbag, make the gas in the gasbag pass through the trachea and transport to the piston intracavity of No. three piston rods, thereby make No. three piston rods ejecting, the motion of No. three piston rods drives the blade upward movement, make the blade cut off the plastic film, realized covering the range of length through No. three piston rods automatic control plastic film, reduce staff's work load, improve staff's work efficiency, a large amount of manpower and materials have been saved.
Preferably, a second spring is arranged in the sand bag; one end of the second spring is fixedly connected with one side of the inner side wall of the sand bag, and the other end of the second spring is fixedly connected with the other side of the inner side wall of the sand bag; the shaking degree of the sand bag is increased through a second spring; during the use, in liquid metal passes through the sprue gate and pours into the sand box into for the expandable graphite in the sand bag is heated the inflation, thereby drives No. two springs and shakes in the sand bag, has strengthened the area of contact between the inside waste gas of entering sand bag through the air vent and the expandable graphite, thereby further improves the purification degree to waste gas, has reduced the exhaust pollution that the lost foam casting shaping caused, promotes staff's operational environment, has protected the environment around the manufacturing site.
The invention has the following beneficial effects:
1. according to the lost foam casting method, the metal liquid is cast and molded in the sand box through the matching of the shell, the fixing unit, the purifying unit and the sealing unit; the quality of the product cast by the sand box is improved, the integrity of the foam plastic model in the molding sand is enhanced, and the standard reaching rate of the product made by liquid metal pouring is improved.
2. According to the lost foam casting method, the purification effect of waste gas generated by casting is realized through the cooperation of the expanded graphite and the vent holes; when gas enters the sand bag through the adsorption film, toxic substances in the gas can be fully absorbed by the expanded graphite, and waste gas pollution caused by lost foam casting forming is reduced.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a flow chart of a casting method of the present invention;
FIG. 2 is a perspective view of a flask according to the present invention;
FIG. 3 is a cross-sectional view of a flask according to the present invention;
FIG. 4 is an enlarged view of a portion of FIG. 2 at A;
FIG. 5 is an enlarged view of a portion of FIG. 3 at B;
in the figure: the device comprises a shell 1, a pouring gate 11, a chute 12, a fixing unit 2, a first piston rod 21, nitrogen 22, a sand bag 23, a second spring 24, a purification unit 3, a second piston rod 31, a first spring 32, expanded graphite 33, a vent hole 34, an adsorption film 35, a sliding block 41, a plastic film 42, an air bag 43, a third piston rod 44, a blade 45 and an air pipe 46.
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 casting method of the present invention includes the following steps:
s1: according to the requirements of customers on products, foam plastic models are manufactured according to an EPC process, in order to enable metal liquid to be fully filled, the surfaces of the foam plastic models are fully coated with refractory coatings, and the foam plastic models coated with the refractory coatings are placed in a drying chamber for drying treatment, so that the influence on the product quality in the casting process is prevented;
s2: paving a layer of dry sand at the bottom of a sand box used for casting, then placing the dried foam plastic model obtained in the step S1 into the sand box, and continuing to place the dry sand into the sand box after the position of the foam plastic model is fixed until the sand box is filled;
s3: performing three-dimensional vibration treatment on the sand box filled with the dry sand obtained in the step S2 to enable the dry sand in the sand box to be more compact, and continuously filling the dry sand into the sand box after the three-dimensional vibration treatment to enhance the compactness of the dry sand and improve the processing quality of the casting;
s4: vacuumizing the sand box obtained in the step S3, performing metal pouring when the vacuum degree in the sand box meets the requirement, directly gasifying the foam plastic model at high temperature, directly filling the metal liquid into the position between the foam plastic models at the moment, copying a casting which is the same as the foam plastic model, condensing the sand box after pouring, releasing vacuum, taking out the casting, and performing the next casting cycle;
wherein, the sand box comprises a shell 1, a fixing unit 2, a purifying unit 3 and a sealing unit; a pouring gate 11 is arranged on the side wall of the shell 1; the fixing unit 2 is fixed on the inner side wall of the shell 1, and the fixing unit 2 comprises a first piston rod 21, nitrogen 22 and a sand bag 23; the first piston rod 21 is fixed on the inner side wall of the shell 1, and the end part of the first piston rod is spherical; the nitrogen 22 is filled in the piston cavity of the first piston rod 21; the lower half part of the foam plastic model is wrapped by the sand bag 23, and the outer side wall of the sand bag 23 is in contact with the first piston rod 21; the purification unit 3 is positioned in the sand bag 23; the sealing unit is arranged on the outer side wall of the shell 1; the metal liquid is cast and molded in the sand box through the matching of the shell 1, the fixing unit 2, the purifying unit 3 and the sealing unit; during the use, before the pouring, preheat the sand box earlier for nitrogen gas 22 in the piston cavity of piston rod 21 is heated and is expanded, with piston rod 21 ejecting to sand bag 23 surface, make sand bag 23 and foam mould the more inseparabler of model laminating, improved the quality of the product through the sand box casting, the mould figurative completeness in the molding sand of reinforcing foam mould model, thereby improve the standard reaching rate of the product that liquid metal pouring made.
As an embodiment of the present invention, the purification unit 3 includes a piston rod No. two 31; one end of the second piston rod 31, which is positioned outside the piston cavity, is connected to the inner side wall of the sand bag 23, which is close to the first piston rod 21, through a first spring 32, the other end of the second piston rod 31 penetrates through the surface of the other side wall of the sand bag 23, and the end part of the piston cavity of the second piston rod 31 is provided with an opening; the metal liquid can fully flow in the sand box through the matching of the second piston rod 31 and the sand bag 23; when the device is used, when the first piston rod 21 is pushed to the sand bag 23 until the sand bag 23 deforms, the second piston rod 31 is pushed to contract under the action of the first spring 32, so that gas generated by pouring of metal liquid is absorbed through the second piston rod 31, the flowing speed of the metal liquid in the sand box is accelerated by absorbing the gas when the second piston rod 31 contracts, the pouring speed of the metal liquid is increased, the working efficiency of workers is improved, the phenomenon of insufficient pouring is reduced, the quality of products cast through the sand box is further improved, and the standard reaching rate of the products cast through the liquid metal is increased.
In one embodiment of the present invention, the sand bag 23 is provided with expanded graphite 33; the side wall of the second piston rod 31 is provided with a vent hole 34, and when the second piston rod 31 extends to the longest position, the vent hole 34 can be communicated with the piston cavity; an adsorption film 35 is arranged on the vent hole 34; the purification effect of waste gas generated by casting is realized through the cooperation of the expanded graphite 33 and the vent holes 34; when the disposable safety valve is used, when the first piston rod 21 is pushed to the sand bag 23 until the sand bag 23 deforms, the second piston rod 31 is pushed to contract under the action of the first spring 32, when the second piston rod 31 contracts to the vent hole 34 to be communicated with the piston cavity, gas absorbed by the second piston rod 31 enters the sand bag 23 through the air hole, wherein most of the absorbed gas is gas generated after the foam plastic model is gasified, the gas contains toxic substances, when the gas passes through the adsorption film 35 on the vent hole 34, primary purification is realized, when the gas enters the sand bag 23 through the adsorption film 35, the toxic substances in the gas can be fully absorbed by the expanded graphite 33, waste gas pollution caused by lost foam casting molding is reduced, the working environment of workers is improved, and the environment around a manufacturing site is protected.
As an embodiment of the present invention, the outer side wall of the housing 1 is provided with a sliding groove 12; the sealing unit includes a slider 41 and a plastic film 42; the sliding block 41 is connected in the sliding groove 12 in a sliding manner; the end of the plastic film 42 is fixed on the slide block 41; the sealing effect on the sand box is realized through the matching of the plastic film 42 and the sliding block 41; when the dry sand mould is used, a layer of dry sand is paved at the bottom of a sand box used for casting, then a foam mould model is placed into the sand box, and after the position of the foam mould model is fixed, the dry sand is continuously placed into the sand box until the sand box is filled; after the sand box is filled, the sand box moves under the driving of the sliding rails, the sliding block 41 is fixed by external equipment, the sliding block 41 generates relative displacement relative to the sand box at the moment, the plastic film 42 fixed on the sliding block 41 is driven to generate relative movement relative to the sand box by the relative movement of the sliding block 41, and after sealing treatment is performed by workers, the sealing of the sand box is realized, the influence of impurity gas on the product quality in the casting and forming process is prevented, so that the quality of the product cast by the sand box is further improved, and the standard reaching rate of the product manufactured by liquid metal pouring is improved.
As an embodiment of the present invention, an air bag 43 is provided at an end of the chute 12; a third piston rod 44 is fixedly connected to the side wall of the vertical chute 12 of the shell 1; the end part of the third piston rod 44 is fixedly connected with a blade 45, and the piston cavity of the third piston rod 44 is communicated with the air bag 43 through an air pipe 46; the blade 45 can contact with the plastic film 42 when the third piston rod 44 is ejected; the sealing effect on the sand box is realized through the matching of the air bag 43, the third piston rod 44 and the blade 45; when the pneumatic sand box is used, after the sand box is filled, the sand box moves under the driving of the sliding rails, the sliding block 41 is fixed by external equipment, the sliding block 41 generates relative displacement relative to the sand box at the moment, the plastic film 42 fixed on the sliding block 41 is driven to generate relative movement relative to the sand box by the relative movement of the sliding block 41, when the sliding block 41 slides to the end part of the sliding groove 12, the air bag 43 is extruded, air in the air bag 43 is conveyed into a piston cavity of the third piston rod 44 through the air pipe 46, the third piston rod 44 is ejected out, the blade 45 is driven by the movement of the third piston rod 44 to move upwards, the plastic film 42 is cut off by the blade 45, the range of the covering length of the plastic film 42 is automatically controlled through the third piston rod 44, the workload of workers is reduced, the working efficiency of the workers is improved.
As an embodiment of the present invention, a second spring 24 is arranged in the sand bag 23; one end of the second spring 24 is fixedly connected with one side of the inner side wall of the sand bag 23, and the other end of the second spring 24 is fixedly connected with the other side of the inner side wall of the sand bag 23; the shaking degree of the sand bag 23 is increased through the second spring 24; during the use, in liquid metal pours into the sand box through sprue gate 11 into for the expanded graphite 33 in the sand bag 23 is heated and expands, thereby drive No. two spring 24 and shake in sand bag 23, strengthened the area of contact between the inside waste gas of entering sand bag 23 through air vent 34 and the expanded graphite 33, thereby further improve the purification degree to waste gas, reduced the exhaust pollution that the lost foam casting shaping caused, promote staff's operational environment, protected the environment around the manufacturing site.
When the foam plastic mould is used, before pouring, the sand box is preheated, so that the nitrogen 22 in the piston cavity of the first piston rod 21 is heated to expand, the first piston rod 21 is ejected out to the surface of the sand bag 23, the sand bag 23 is attached to the foam plastic mould more tightly, the quality of a product cast by the sand box is improved, the integrity of the foam plastic mould in molding sand is enhanced, and the standard reaching rate of the product manufactured by liquid metal pouring is improved; when the first piston rod 21 is pushed to the sand bag 23 until the sand bag 23 deforms, the second piston rod 31 is pushed to contract under the action of the first spring 32, so that gas generated by pouring of the metal liquid is absorbed by the second piston rod 31, the flowing speed of the metal liquid in the sand box is accelerated by absorbing the gas when the second piston rod 31 contracts, the pouring speed of the metal liquid is increased, the working efficiency of workers is improved, the phenomenon of insufficient pouring is reduced, the quality of a product cast by the sand box is further improved, and the standard reaching rate of the product cast by the liquid metal is improved; when the first piston rod 21 is pushed to the sand bag 23 until the sand bag 23 deforms, the second piston rod 31 is pushed to contract under the action of the first spring 32, when the second piston rod 31 contracts to the vent hole 34 to be communicated with the piston cavity, gas absorbed by the second piston rod 31 enters the sand bag 23 through the air hole, wherein most of the absorbed gas is gas generated after the foam plastic model is gasified, the gas contains toxic substances, when the gas passes through the adsorption film 35 on the vent hole 34, preliminary purification is realized, and when the gas enters the sand bag 23 through the adsorption film 35, the toxic substances in the gas can be fully absorbed by the expanded graphite 33, so that waste gas pollution caused by lost foam casting molding is reduced, the working environment of workers is improved, and the environment around a manufacturing site is protected; in the casting process, a layer of dry sand is paved at the bottom of a sand box used for casting, then a foam plastic model is put into the sand box, and after the position of the foam plastic model is fixed, the dry sand is continuously put into the sand box until the sand box is filled; after the sand box is filled, the sand box moves under the driving of the sliding rails, the sliding block 41 is fixed by external equipment, the sliding block 41 generates relative displacement relative to the sand box at the moment, the plastic film 42 fixed on the sliding block 41 is driven to generate relative movement relative to the sand box by the relative movement of the sliding block 41, and after sealing treatment is carried out by workers, the sealing of the sand box is realized, the influence of impurity gas on the product quality in the casting and forming process is prevented, so that the quality of the product cast by the sand box is further improved, and the standard reaching rate of the product cast by liquid metal is improved; after the sand box is filled, the sand box moves under the driving of the sliding rails, the sliding block 41 is fixed by external equipment, at the moment, the sliding block 41 generates relative displacement relative to the sand box, the relative movement of the sliding block 41 drives the plastic film 42 fixed on the sliding block 41 to generate relative movement relative to the sand box, when the sliding block 41 slides to the end part of the sliding groove 12, the air bag 43 is extruded, air in the air bag 43 is conveyed into a piston cavity of the third piston rod 44 through the air pipe 46, so that the third piston rod 44 is ejected, the movement of the third piston rod 44 drives the blade 45 to move upwards, the blade 45 cuts off the plastic film 42, the automatic control of the coverage length range of the plastic film 42 through the third piston rod 44 is realized, the workload of workers is reduced, the working efficiency of the workers is improved, and a large number of manpower; when liquid metal is injected into the sand box through the pouring gate 11, the expanded graphite 33 in the sand bag 23 is heated and expanded, so that the second spring 24 is driven to shake in the sand bag 23, the contact area between the waste gas entering the sand bag 23 through the vent hole 34 and the expanded graphite 33 is increased, the purification degree of the waste gas is further improved, the waste gas pollution caused by lost foam casting forming is reduced, the working environment of workers is improved, and the environment around the manufacturing site is protected.
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 (6)
1. A lost foam casting method is characterized in that: the casting method comprises the following steps:
s1: according to the requirements of customers on products, foam plastic models are manufactured according to an EPC process, in order to enable metal liquid to be fully filled, the surfaces of the foam plastic models are fully coated with refractory coatings, and the foam plastic models coated with the refractory coatings are placed in a drying chamber for drying treatment, so that the influence on the product quality in the casting process is prevented;
s2: paving a layer of dry sand at the bottom of a sand box used for casting, then placing the dried foam plastic model obtained in the step S1 into the sand box, and continuing to place the dry sand into the sand box after the position of the foam plastic model is fixed until the sand box is filled;
s3: performing three-dimensional vibration treatment on the sand box filled with the dry sand obtained in the step S2 to enable the dry sand in the sand box to be more compact, and continuously filling the dry sand into the sand box after the three-dimensional vibration treatment to enhance the compactness of the dry sand and improve the processing quality of the casting;
s4: vacuumizing the sand box obtained in the step S3, performing metal pouring when the vacuum degree in the sand box meets the requirement, directly gasifying the foam plastic model at high temperature, directly filling the metal liquid into the position between the foam plastic models at the moment, copying a casting which is the same as the foam plastic model, condensing the sand box after pouring, releasing vacuum, taking out the casting, and performing the next casting cycle;
wherein, the sand box comprises a shell (1), a fixing unit (2), a purifying unit (3) and a sealing unit; a pouring gate (11) is arranged on the side wall of the shell (1); the fixing unit (2) is fixed on the inner side wall of the shell (1), and the fixing unit (2) comprises a first piston rod (21), nitrogen (22) and a sand bag (23); the first piston rod (21) is fixed on the inner side wall of the shell (1), and the end part of the first piston rod is spherical; the nitrogen (22) is filled in a piston cavity of the first piston rod (21); the lower half part of the foam plastic model is wrapped by the sand bag (23), and the outer side wall of the sand bag (23) is in contact with the first piston rod (21); the purification unit (3) is positioned in the sand bag (23); the sealing unit is arranged on the outer side wall of the shell (1); the metal liquid is cast and molded in the sand box through the matching of the shell (1), the fixing unit (2), the purifying unit (3) and the sealing unit.
2. A lost foam casting method according to claim 1, wherein: the purification unit (3) comprises a second piston rod (31); one end, located outside the piston cavity, of the second piston rod (31) is connected to the inner side wall, close to the first piston rod (21), of the sand bag (23) through a first spring (32), the other end of the second piston rod (31) penetrates through the surface of the other side wall of the sand bag (23), and the end of the piston cavity of the second piston rod (31) is arranged to be an opening; the metal liquid can fully flow in the sand box through the matching of the second piston rod (31) and the sand bag (23).
3. A lost foam casting method according to claim 2, wherein: the sand bag (23) is internally provided with expanded graphite (33); the side wall of the second piston rod (31) is provided with a vent hole (34), and when the second piston rod (31) stretches to the longest position, the vent hole (34) can be communicated with the piston cavity; an adsorption film (35) is arranged on the vent hole (34); the purification effect of the waste gas generated by casting is realized through the cooperation of the expanded graphite (33) and the vent holes (34).
4. A lost foam casting method according to claim 1, wherein: a sliding groove (12) is arranged on the outer side wall of the shell (1); the sealing unit comprises a slider (41) and a plastic film (42); the sliding block (41) is connected in the sliding groove (12) in a sliding manner; the end part of the plastic film (42) is fixed on the sliding block (41); the sealing effect on the sand box is realized through the matching of the plastic film (42) and the sliding block (41).
5. A lost foam casting method according to claim 4, wherein: an air bag (43) is arranged at the end part of the sliding chute (12); a third piston rod (44) is fixedly connected to the side wall of the vertical sliding groove (12) of the shell (1); the end part of the third piston rod (44) is fixedly connected with a blade (45), and a piston cavity of the third piston rod (44) is communicated with the air bag (43) through an air pipe (46); the blade (45) can be in contact with the plastic film (42) when the third piston rod (44) is ejected; the sealing effect on the sand box is realized through the matching of the air bag (43), the third piston rod (44) and the blade (45).
6. A lost foam casting method according to claim 3, wherein: a second spring (24) is arranged in the sand bag (23); one end of the second spring (24) is fixedly connected with one side of the inner side wall of the sand bag (23), and the other end of the second spring (24) is fixedly connected with the other side of the inner side wall of the sand bag (23); the shaking degree of the sand bag (23) is increased by a second spring (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910696303.4A CN110280720B (en) | 2019-07-30 | 2019-07-30 | Lost foam casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910696303.4A CN110280720B (en) | 2019-07-30 | 2019-07-30 | Lost foam casting method |
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| CN110280720A CN110280720A (en) | 2019-09-27 |
| CN110280720B true CN110280720B (en) | 2020-12-08 |
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| CN201910696303.4A Active CN110280720B (en) | 2019-07-30 | 2019-07-30 | Lost foam casting method |
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| CN111922284B (en) * | 2020-07-29 | 2022-03-22 | 明光市明泰五金制品有限公司 | Duplex evaporative die casting aluminum process |
| CN112974737A (en) * | 2021-02-05 | 2021-06-18 | 方炎金 | Sand box for casting |
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| JPH01254347A (en) * | 1988-04-04 | 1989-10-11 | Mazda Motor Corp | Casting method using lost foam pattern |
| CN104226907A (en) * | 2014-09-30 | 2014-12-24 | 无锡康柏斯机械科技有限公司 | Lost foam casting process capable of compacting sand further |
| CN105834362B (en) * | 2016-05-16 | 2018-06-15 | 广西大学 | The lost-foam casting method of ultrasonic vibration resin self-setting sand |
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