CN109570442A - The method for reducing the accumulation of water-glass sand casting and molding alkali metal and reducing antiquated sand discharge - Google Patents
The method for reducing the accumulation of water-glass sand casting and molding alkali metal and reducing antiquated sand discharge Download PDFInfo
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- CN109570442A CN109570442A CN201910015786.7A CN201910015786A CN109570442A CN 109570442 A CN109570442 A CN 109570442A CN 201910015786 A CN201910015786 A CN 201910015786A CN 109570442 A CN109570442 A CN 109570442A
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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
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
- B22C1/186—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents contaming ammonium or metal silicates, silica sols
- B22C1/188—Alkali metal silicates
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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
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
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Abstract
A kind of method for reducing antiquated sand discharge the present invention provides reduction water-glass sand casting and molding alkali metal accumulation, the first sodium silicate shell of the binder preparation target casting based on waterglass, then sodium silicate shell is embedded in the dry sand that can be taken out in the sandbox of negative pressure, then successively dry sand consolidation is vacuumized and makes casting mold and casting；It will be by the wall thickness reduction of the sand mold of waterglass molding bonded to 1-50mm, and compound dry sand negative pressure of vacuum moulding is cast, to make waterglass drop within 1wt% the total accounting of molding sand, in conjunction with old sand dry or wet regeneration treatment on the basis of this waterglass low accounting, make sodium oxide molybdena, the alkali metal such as potassium oxide are not built up, to carry out that the modulus for the molding sand being blended is made to maintain to stablize when mulling using the reclaimed sand after regenerating used, improve the molding sand up time, old sand is reused and does not become antiquated sand, reduce the discharge of antiquated sand, alleviate antiquated sand exhaust emission environmental problem.
Description
Technical field
The present invention relates to water-glass sand casting technology fields, more particularly, to a kind of reduction water-glass sand casting and molding alkali gold
The method for belonging to accumulation and reducing antiquated sand discharge.
Background technique
Water-glass sand casting and molding using waterglass as binder, make by silica sand, nice foundry sand, ceramsite sand, chromite sand etc.
For molding sand, cast after carrying out moulding.
There are some technical disadvantages for water-glass sand casting and molding:
1) common water-glass sand formative technology: waterglass accounts for the 2-8wt% of molding sand as binder additional amount, and moulding is laggard
Row drying hardening, after cast article, for sand mold by high temperature sintering, sand bond is higher, it is difficult to which voluntarily defeated and dispersed, old sand is difficult to repeat
It uses；It is higher additionally, due to waterglass additional amount, Reusability process of the alkali metal such as sodium oxide molybdena therein, potassium oxide in molding sand
In will form accumulation, increase (silicon alkali than increase) so as to cause the modulus of water glass of the stylish addition of modeling process next time, cause
The molding sand curing time being blended is too short, is not available, and is discarded, is caused in environmental pollution and cost so as to cause a large amount of molding sand
It rises.
2) the carbon dioxide hardened glass sand molding process (VRH) of vacuum: waterglass accounts for molding sand as binder additional amount
2-4%, be passed through carbon dioxide after vacuumizing to molding sand and harden, be greatly improved casting after waterglass sand mold it is defeated and dispersed
Property, improves the rate of recovery of old sand, but due to waterglass additional amount still higher, the dry method in reclamation of return sand that accounts for molding sand ratio
After regeneration treatment, since the removal efficiency of the alkali metal such as sodium oxide molybdena, potassium oxide is lower, after old sand Reusability, however it remains oxygen
The accumulation problem for changing the alkali metal such as sodium, potassium oxide causes the water-glass sand up time to shorten, and moulding-sand property deteriorates, to lead
It causes a large amount of molding sand to be discarded, leads to environmental pollution and cost increase.
3) rouge hardening process sodium silicate molding technique: waterglass accounts for the 3-4% of molding sand as binder additional amount, using adding
The alicyclic organic entered is hardened, and the collapsibility of waterglass sand mold after casting is greatly improved, improves the rate of recovery of old sand, but
That to account for molding sand ratio due to the additional amount of waterglass still higher, in reclamation of return sand after dry reclamation processing, due to sodium oxide molybdena,
The removal efficiency of the alkali metal such as potassium oxide is lower, after old sand Reusability, however it remains the product of the alkali metal such as sodium oxide molybdena, potassium oxide
Tired problem, causes the water-glass sand up time to shorten, and moulding-sand property deteriorates, and is discarded so as to cause a large amount of molding sand, leads to ring
Border pollution and cost increase.
The old sand that above-mentioned sodium silicate molding technique generates is handled according to wet reclamation, the alkali gold such as sodium oxide molybdena, potassium oxide
The removal efficiency of category will greatly improve, and old sand can be used as fresh sand use, but wet-treating difficulty is higher, costly, waste water
Processing difficulty is big, is unfavorable for promoting the use of.
Therefore, waterglass is as inorganic binder, although not discharging poisonous fume in casting process, due to oxidation
The accumulation of the alkali metal such as sodium, potassium oxide causes molding sand to be difficult to be used for multiple times, old sand can not recycling and reusing reform into antiquated sand, antiquated sand
Discharge amount is higher, and one ton of casting needs to discharge one ton or more of antiquated sand, this causes seriously to pollute, improve simultaneously to soil and water
Production cost.Alkali metal gradually accumulates in water-glass sand casting and molding, eventually leads to moulding-sand property deterioration, molding sand up time
The problems such as too short, antiquated sand exhaust emission environment.
Summary of the invention
The embodiment of the present invention is designed to provide a kind of reduction water-glass sand casting and molding alkali metal accumulation and reduces useless
The method of sand discharge.
In order to solve the above technical problems, technical solution provided by the invention are as follows:
A method of it reducing the accumulation of water-glass sand casting and molding alkali metal and reduces antiquated sand discharge, comprising the following steps:
1) it prepares shell: being used for the sodium silicate shell of cast object casting with the binder preparation of interior hydrated glass；
2) dry sand then sodium silicate shell made from step 1) being embedded in the sandbox for being connected to vacuum pump and taking out negative pressure
In, then dry sand consolidation is vacuumized and makes casting mold, then the casting molten metal into the sodium silicate shell, when reaching unpacking
Between after abolish casting mold, obtain the old sand become after casting, the dry sand of recycling and the sodium silicate shell are broken into pieces；
3) regenerating used: the old sand that step 2) is obtained carries out dry or wet regeneration treatment, obtains reclaimed sand.
Preferably, in step 1), the shell thickness of sodium silicate shell is 1mm~50mm.
Preferably, in step 1), the sodium silicate shell is divided into upper mould shell and lower part shell, the sodium silicate shell by
Seperated upper mould shell assembles with lower part shell.
Preferably, in step 2), the upper mould shell is embedded in cope, and the lower part shell is embedded in drag box
In.
Preferably, step 2) specifically:
A) prepare for being connected to vacuum pump to take out the cope of negative pressure and drag box, the cope is top opening and bottom
Open-mouth is provided with upper flange plate, and the drag box is that top is open and bottom open-mouth is provided with lower flange；
B) upper mould shell is fixed in the central through hole on the upper flange plate, the lower part shell is fixed on
In central through hole on the lower flange；
C) the push pipe mouth of running channel is connected to the bottom rim of a cup of sprue cup and connects the bottom tube mouth of running channel and the upper mould shell
It passes to so that the cavity connection in the sprue cup, running channel and upper mould shell is circulated for molten metal；
D) back side of the shell into cope and drag box fills dry sand and by dry sand consolidation, then in cope under
Plastic covering film is sealed on the upper surface of sand mold in sandbox；
E) inner surface of upper mould shell and lower part shell is subjected to cleaning and swabbing, then assembles sand core, then will under
Sandbox back-off comes to carry out taking out with cope negative pressure mould assembling to form a complete casting mold, and cope and drag box pass through upper method
Bolt connection between blue disk and lower flange；
F) negative pressure is taken out to cope and drag box and pours into molten metal simultaneously, complete casting；
G) cope is vacuumized with drag box and stops vacuumizing after a certain period of time, torn open after cooling to setting time
The cope and drag box are opened, casting mold is then abolished, obtains the dry sand and the sodium silicate shell quilt of casting, recycling
The old sand become after breaking into pieces.
Preferably, prepare first for being connected to vacuum pump to take out the cope of negative pressure and drag box, the cope is
Top is open and bottom open-mouth is provided with upper flange plate, and the drag box is that top is open and bottom open-mouth is provided with lower flange；
Then shell is prepared: during preparing shell, by the upper mould shell directly on the upper flange plate
Molding is in central through hole to which top shell mould to be fixed in upper flange plate, by the lower part shell directly in the lower flange
On central through hole in molding so that lower part shell mould is fixed in lower flange.
Preferably, in step 2), the upper mould shell and lower part shell are embedded in the same sandbox.
Preferably, step 2) specifically:
A) prepare to carry out the inner surface of upper mould shell and lower part shell for being connected to vacuum pump to take out the sandbox of negative pressure
Cleaning and swabbing, then assemble sand core；
B the push pipe mouth of running channel is connected to the bottom rim of a cup of sprue cup) and connects the bottom tube mouth of running channel and the upper mould shell
It passes to so that the cavity connection in the sprue cup, running channel and upper mould shell is circulated for molten metal；
C) the connection sprue cup, running channel and the upper mould shell that fit together are placed in sandbox, and by lower part shell
With upper mould shell assembling so that upper mould shell and lower part shell constitute a complete shell；
D dry sand) is filled out into sandbox, then vibration ramming dry sand, then seal and cover on the upper surface of the sand mold in sandbox
Lid plastic film；
E) sandbox take out negative pressure while pouring into molten metal completing casting；
F) then sandbox is vacuumized and stops vacuumizing after a certain period of time, is dismantled after cooling to setting time described
Then sandbox abolishes casting mold, obtain becoming old after casting, the dry sand of recycling and the sodium silicate shell are broken into pieces
Sand.
The application achieves following beneficial technical effect:
1) 100mm will be not less than by traditional by the thickness of the sand mold of water glass of binder molding bonded, is thinned to shell
Shell wall thickness 1-50mm.
2) the lesser shell of wall thickness is combined with vacuum dry moulding, compensates for the weak problem of the intensity of shell.
3) ratio of the total sand amount (including dry sand) of the molding sand Zhan containing water glass of binder drops to 5-20wt%, to make
The dosage of water glass of binder accounts within the 1wt% of total sand amount (including dry sand), to reduce the alkali metal pair such as sodium oxide molybdena
The accounting of molding sand, that is, concentration decline.
4) wall thickness of the shell containing binder is smaller, and it is fully sintered that waterglass may be implemented, to make sodium oxide molybdena, oxidation
The alkali metal such as potassium are converted to ceramic phase close to all sintering, to reduce the accumulation of the alkali metal such as sodium oxide molybdena when reclamation of return sand.
5) old sand that above-mentioned sodium silicate shell becomes after being broken into pieces is in dry reclamation treatment process, the water glass not being sintered
Glass and sodium oxide molybdena can become dust and be detached from molding sand, and since the alkali metal such as binder and sodium oxide molybdena, potassium oxide are to the accounting of molding sand
Concentration is lower, and the alkali metal such as sodium oxide molybdena, potassium oxide in molding sand can be removed to lower numerical value by dry reclamation processing, does not generate
Accumulation.
To sum up, the side of antiquated sand discharge is reduced the present invention provides a kind of reduction water-glass sand casting and molding alkali metal accumulation
Method first prepares the waterglass of target casting based on waterglass as binder according to shell preparation method or investment casting method
Then shell is embedded in sodium silicate shell in the dry sand that can be taken out in the sandbox of negative pressure, then successively vacuumize to dry sand consolidation
Make casting mold and the casting molten metal into shell；It will be by the wall thickness reduction of the sand mold of water glass of binder molding bonded to 1-
50mm, and compound dry sand vacuo-forming is cast, to make waterglass drop within 1wt% the total accounting of molding sand, herein
In conjunction with old sand dry or wet regeneration treatment on the basis of the low accounting of waterglass, produce the alkali metal such as sodium oxide molybdena, potassium oxide not
Raw accumulation, is basically unchanged the molding sand modulus (silicon alkali ratio) being blended, to improve the molding sand up time, enable old sand again
Secondary use does not become antiquated sand, reduces the discharge of antiquated sand, alleviates antiquated sand exhaust emission environmental problem.
Detailed description of the invention
Fig. 1 is that a kind of reduction water-glass sand casting and molding alkali metal that the embodiment of the present invention provides accumulates and reduces antiquated sand
The structural schematic diagram of the casting system of the method for discharge；
Fig. 2 is that a kind of reduction water-glass sand casting and molding alkali metal that another embodiment of the present invention provides is accumulated and reduced
The structural schematic diagram of the casting system of the method for antiquated sand discharge.
In figure: 1 sprue cup, 2 running channels, 3 dry sands, 4 upper mould shells, 5 lower part shells, 6 plastic films, 7 work tops；
11 sandboxes, 12 vaccum suction tubes；
21 copes, 22 drag boxs, 23 upper flange plates, 24 lower flanges.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that, term " center ", " axial direction ", " radial direction ", " longitudinal direction ", " transverse direction ",
" length ", " width ", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outside", " clockwise ", " inverse
The orientation or positional relationship of the instructions such as hour hands " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description originally
Invention and simplified description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific side
Position construction and operation, therefore be not considered as limiting the invention.
Referring to Fig.1-2, Fig. 1 is a kind of reduction water-glass sand casting and molding alkali metal accumulation that the embodiment of the present invention provides
And the structural schematic diagram of the casting system of the method for antiquated sand discharge is reduced, it include sprue cup 1, running channel 2, dry sand 3, top in Fig. 1
Shell 4, lower part shell 5, plastic film 6, vaccum suction tube 12, cope 21, drag box 22, upper flange plate 23, lower flange
24, work top 7；
Fig. 2 is that a kind of reduction water-glass sand casting and molding alkali metal that another embodiment of the present invention provides is accumulated and reduced
The structural schematic diagram of the casting system of the method for antiquated sand discharge, includes sprue cup 1 in Fig. 2, running channel 2, dry sand 3, upper mould shell 4,
Lower part shell 5, plastic film 6, sandbox 11, vaccum suction tube 12.
A kind of method for reducing antiquated sand discharge this application provides reduction water-glass sand casting and molding alkali metal accumulation, packet
Include following steps:
1) it prepares shell: being used for the sodium silicate shell of cast object casting with the binder preparation of interior hydrated glass；
2) dry sand 3 then sodium silicate shell made from step 1) being embedded in the sandbox for being connected to vacuum pump and taking out negative pressure
In, then 3 consolidation of dry sand is vacuumized and makes casting mold, then the casting molten metal into the sodium silicate shell, unpacking when reaching
Casting mold is abolished after time, obtains the old sand become after casting, the dry sand 3 of recycling and the sodium silicate shell are broken into pieces；
3) regenerating used: the old sand that step 2) is obtained carries out dry or wet regeneration treatment, obtains reclaimed sand.
Above-mentioned steps 1) in prepare shell: the waterglass of cast object casting is used for the preparation of the binder of interior hydrated glass
Shell；Specifically: VRH legal system shell is perhaps combined according to shell production method or investment casting method or is hardened using rouge
Waterglass carries out shell processed.
In one embodiment of the application, in step 1), the shell thickness of sodium silicate shell is 1mm~50mm.
In one embodiment of the application, in step 1), the sodium silicate shell is divided into upper mould shell 4 and lower part shell
5, the sodium silicate shell is assembled by seperated upper mould shell 4 with lower part shell 5.
In one embodiment of the application, in step 2), the upper mould shell 4 is embedded in cope 21, under described
Portion's shell 5 is embedded in drag box 22.
In one embodiment of the application, above-mentioned reduction water-glass sand casting and molding alkali metal accumulates and reduces antiquated sand row
The step 2) in method put specifically:
A) prepare cope 21 and drag box 22 that negative pressure is taken out for being connected to vacuum pump, the cope 21 is that top is spacious
Mouth and bottom open-mouth are provided with upper flange plate 23, and the drag box 22 is that top is open and bottom open-mouth is provided with lower flange 24；
B) upper mould shell 4 is fixed in the central through hole on the upper flange plate 23, the lower part shell 5 is consolidated
It is scheduled in the central through hole on the lower flange 24；
C) the push pipe mouth of running channel 2 is connected to the bottom rim of a cup of sprue cup 1 and by the bottom tube mouth of running channel 2 and the upper mould shell
4 connections are so that the cavity connection in the sprue cup 1, running channel 2 and upper mould shell 4 is circulated for molten metal；
D) back side of the shell into cope 21 and drag box 22 fills dry sand 3 and by 3 consolidation of dry sand, then in upper sand
Plastic covering film 6 is sealed on the upper surface of sand mold in case 21 and drag box 22；
E) inner surface of upper mould shell 4 and lower part shell 5 is subjected to cleaning and swabbing, then assembles sand core, then will
The back-off of drag box 22 comes to carry out taking out with cope 21 negative pressure mould assembling to form a complete casting mold, cope 21 and drag box
22 are connected by the bolt between upper flange plate 23 and lower flange 24；
F) negative pressure is taken out to cope 21 and drag box 22 and pours into molten metal simultaneously, complete casting；
G) cope 21 and drag box 22 are vacuumized and stops vacuumizing after a certain period of time, when cooling to setting time
After dismantle the cope 21 and drag box 22, then abolish casting mold, obtain the dry sand 3 and the water of casting, recycling
The old sand that glass shell becomes after being broken into pieces.
In one embodiment of the application, prepare first for being connected to vacuum pump to take out the cope 21 of negative pressure under
Sandbox 22, the cope 21 is that top is open and bottom open-mouth is provided with upper flange plate 23, the drag box 22 be top it is open and
Bottom open-mouth is provided with lower flange 24；
Then shell is prepared: during preparing shell, by the upper mould shell 4 directly on the upper flange plate 23
Central through hole in molding so that top shell mould 4 is fixed in upper flange plate 23, by the lower part shell 5 directly under described
Molding is in central through hole on ring flange 24 to which lower part shell mould 5 to be fixed in lower flange 24；
" upper mould shell 4 directly forms in the central through hole on the upper flange plate 23 " herein means with upper flange plate
As a portion mold in the entire mold for preparing shell, directly in the central through hole on upper flange plate 23 in preparation
Portion's shell is directly anchored on upper flange plate after upper mould shell hardening；" lower part shell 5 is directly on the lower flange 24
Formed in central through hole " meaning and it is above-mentioned similarly.
In one embodiment of the application, in step 2), the upper mould shell 4 is embedded in same with lower part shell 5
In sandbox.
In one embodiment of the application, above-mentioned reduction water-glass sand casting and molding alkali metal accumulates and reduces antiquated sand row
The step 2) in method put specifically:
A) prepare the sandbox 11 that negative pressure is taken out for being connected to vacuum pump, by the inner surface of upper mould shell 4 and lower part shell 5
Cleaning and swabbing are carried out, sand core is then assembled；
B) the push pipe mouth of running channel 2 is connected to the bottom rim of a cup of sprue cup 1 and by the bottom tube mouth of running channel 2 and the upper mould shell
4 connections are so that the cavity connection in the sprue cup 1, running channel 2 and upper mould shell 4 is circulated for molten metal；
C) the connection sprue cup 1, running channel 2 and the upper mould shell 4 that fit together are placed in sandbox 11, and by lower part
Shell 5 and upper mould shell 4 assemble so that upper mould shell 4 and lower part shell 5 constitute a complete shell；
D dry sand 3) is filled out into sandbox 11, then vibration ramming dry sand 3, then on the upper surface of the sand mold in sandbox 11
Seal plastic covering film 6；
E) sandbox 11 take out negative pressure while pouring into molten metal completing casting；
F) then sandbox 11 is vacuumized and stops vacuumizing after a certain period of time, institute is dismantled after cooling to setting time
Sandbox 11 is stated, casting mold is then abolished, obtains becoming after casting, the dry sand 3 of recycling and the sodium silicate shell are broken into pieces
Old sand.
Above-mentioned sandbox 11, cope 21 and drag box 22 are connected to by vaccum suction tube 12 respectively thereon with vacuum pump
For taking out negative pressure.
A kind of method for reducing antiquated sand discharge the present invention provides reduction water-glass sand casting and molding alkali metal accumulation, first
Prepare the sodium silicate shell of target casting according to shell preparation method or investment casting method as binder based on waterglass,
Then sodium silicate shell is embedded in the dry sand 3 that can be taken out in the sandbox of negative pressure, then successively 3 consolidation of dry sand is vacuumized and makes casting
Type and the casting molten metal into shell；By by the wall thickness reduction of the sand mold of water glass of binder molding bonded to 1-50mm, and
Compound 3 vacuo-forming of dry sand is cast, to make waterglass drop within 1wt% the total accounting of molding sand, in this waterglass
In conjunction with old sand dry or wet regeneration treatment on the basis of low accounting, build up the alkali metal such as sodium oxide molybdena, potassium oxide not,
It is basically unchanged the molding sand modulus (silicon alkali ratio) being blended, to improve the molding sand up time, old sand is reused
Do not become antiquated sand, reduce the discharge of antiquated sand, alleviates antiquated sand exhaust emission environmental problem.
The method and apparatus of the not detailed description of the present invention are the prior art, are repeated no more.
The above description of the embodiment is only used to help understand the method for the present invention and its core ideas.It should be pointed out that pair
For those skilled in the art, without departing from the principle of the present invention, the present invention can also be carried out
Some improvements and modifications, these improvements and modifications also fall within the scope of protection of the claims of the present invention.
Claims (8)
1. a kind of method for reducing the accumulation of water-glass sand casting and molding alkali metal and reducing antiquated sand discharge, which is characterized in that including
Following steps:
1) it prepares shell: being used for the sodium silicate shell of cast object casting with the binder preparation of interior hydrated glass；
2) then sodium silicate shell made from step 1) is embedded in the dry sand in the sandbox for being connected to vacuum pump and taking out negative pressure, so
Dry sand consolidation is vacuumized afterwards and makes casting mold, then the casting molten metal into the sodium silicate shell, after reaching Shake-out Time
Casting mold is abolished, the old sand become after casting, the dry sand of recycling and the sodium silicate shell are broken into pieces is obtained；
3) regenerating used: the old sand that step 2) is obtained carries out dry or wet regeneration treatment, obtains reclaimed sand.
2. the method according to claim 1, wherein in step 1), the shell thickness of sodium silicate shell be 1mm~
50mm。
3. the method according to claim 1, wherein the sodium silicate shell is divided into upper mould shell in step 1)
With lower part shell, the sodium silicate shell is assembled by seperated upper mould shell with lower part shell.
4. according to the method described in claim 3, it is characterized in that, the upper mould shell is embedded in cope in step 2),
The lower part shell is embedded in drag box.
5. according to the method described in claim 4, it is characterized in that, step 2) specifically:
A) prepare for being connected to vacuum pump to take out the cope of negative pressure and drag box, the cope is that top is open and bottom is open
Place is provided with upper flange plate, and the drag box is that top is open and bottom open-mouth is provided with lower flange；
B) upper mould shell is fixed in the central through hole on the upper flange plate, the lower part shell is fixed on described
In central through hole on lower flange；
C) the push pipe mouth of running channel is connected to the bottom rim of a cup of sprue cup and is connected to the bottom tube mouth of running channel with the upper mould shell with
So that the cavity connection in the sprue cup, running channel and upper mould shell is circulated for molten metal；
D) back side of the shell into cope and drag box fills dry sand and by dry sand consolidation, then in cope and drag box
Plastic covering film is sealed on the upper surface of interior sand mold；
E) inner surface of upper mould shell and lower part shell is subjected to cleaning and swabbing, sand core is then assembled, then by drag box
Back-off comes to carry out taking out with cope negative pressure mould assembling to form a complete casting mold, and cope and drag box pass through upper flange plate
Bolt between lower flange is connect；
F) negative pressure is taken out to cope and drag box and pours into molten metal simultaneously, complete casting；
G) cope is vacuumized with drag box and stops vacuumizing after a certain period of time, institute is dismantled after cooling to setting time
Cope and drag box are stated, casting mold is then abolished, casting, the dry sand of recycling and the sodium silicate shell is obtained and is broken into pieces
The old sand become afterwards.
6. according to the method described in claim 4, it is characterized in that, preparing first for being connected to vacuum pump to take out negative pressure
Sandbox and drag box, the cope is that top is open and bottom open-mouth is provided with upper flange plate, the drag box be top it is open and
Bottom open-mouth is provided with lower flange；
Then shell is prepared: during preparing shell, by center of the upper mould shell directly on the upper flange plate
Molding is in through-hole to which top shell mould to be fixed in upper flange plate, by the lower part shell directly on the lower flange
Molding is in central through hole to which lower part shell mould to be fixed in lower flange.
7. according to the method described in claim 3, it is characterized in that, the upper mould shell and lower part shell are pre-buried in step 2)
In the same sandbox.
8. the method according to the description of claim 7 is characterized in that step 2) specifically:
A) prepare to clear up upper mould shell and the inner surface of lower part shell for being connected to vacuum pump to take out the sandbox of negative pressure
With swabbing, sand core is then assembled；
B the push pipe mouth of running channel is connected to the bottom rim of a cup of sprue cup) and is connected to the bottom tube mouth of running channel with the upper mould shell with
So that the cavity connection in the sprue cup, running channel and upper mould shell is circulated for molten metal；
C) the connection sprue cup, running channel and the upper mould shell that fit together are placed in sandbox, and by lower part shell with it is upper
Shell assembling in portion's is so that upper mould shell and lower part shell constitute a complete shell；
D dry sand) is filled out into sandbox, then vibration ramming dry sand, then sealing covering modeling on the upper surface of the sand mold in sandbox
Expect film；
E) sandbox take out negative pressure while pouring into molten metal completing casting；
F) then sandbox is vacuumized and stops vacuumizing after a certain period of time, the sand is dismantled after cooling to setting time
Then case abolishes casting mold, obtain the old sand become after casting, the dry sand of recycling and the sodium silicate shell are broken into pieces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910015786.7A CN109570442A (en) | 2019-01-08 | 2019-01-08 | The method for reducing the accumulation of water-glass sand casting and molding alkali metal and reducing antiquated sand discharge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910015786.7A CN109570442A (en) | 2019-01-08 | 2019-01-08 | The method for reducing the accumulation of water-glass sand casting and molding alkali metal and reducing antiquated sand discharge |
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| CN109570442A true CN109570442A (en) | 2019-04-05 |
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| CN201910015786.7A Pending CN109570442A (en) | 2019-01-08 | 2019-01-08 | The method for reducing the accumulation of water-glass sand casting and molding alkali metal and reducing antiquated sand discharge |
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| CN111390115A (en) * | 2020-04-02 | 2020-07-10 | 邯郸慧桥复合材料科技有限公司 | Wear-resistant part shell mold casting method |
| CN113000798A (en) * | 2021-02-23 | 2021-06-22 | 南宁智鸿技研机械技术有限公司 | Thin-wall wear-resistant aluminum alloy founding casting process |
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