CN111618235A - Method for preventing sand sticking of oil duct of casting - Google Patents
Method for preventing sand sticking of oil duct of casting Download PDFInfo
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- CN111618235A CN111618235A CN202010639144.7A CN202010639144A CN111618235A CN 111618235 A CN111618235 A CN 111618235A CN 202010639144 A CN202010639144 A CN 202010639144A CN 111618235 A CN111618235 A CN 111618235A
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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
- B22C1/167—Mixtures of inorganic and organic binding agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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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
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/088—Feeder heads
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Abstract
The invention discloses a method for preventing sand sticking of an oil duct of a casting; including S1: molding sand preparation process, S2: sand box preparation process and S3: a pouring process; according to the invention, different debugging is carried out on the proportion and the raw materials of the molding sand, so that the molding sand can resist high temperature, when the molding sand is manufactured by mixing, various adhesion agents are added into the molding sand, so that the molding sand has strong adhesion, the proportion and the raw materials of the coating are debugged, the coating is sprayed by adopting air pressure, so that the coating can be uniformly coated on the molding sand, the high temperature resistant material and the adhesion agents are adopted in the coating, a riser is debugged, the damage of the riser or the inflow of oxides can be reduced, a ladle is connected by adopting a sprue cup, the metal liquid is poured after being cooled, and part of positions adopt high temperature resistant molding sand and are prepared by adopting chromite sand or zircon sand.
Description
Technical Field
The invention belongs to the technical field of casting production, and particularly relates to a method for preventing sand sticking of an oil passage of a casting.
Background
The casting is a metal molding object obtained by various casting methods, namely, smelted liquid metal is poured into a prepared casting mould by pouring, injecting, sucking or other casting methods, and after the casting mould is cooled and is subjected to subsequent processing means such as grinding and the like, the object with certain shape, size and performance is obtained, and the problem that molding sand is adhered to the casting easily occurs in the casting process, however, various methods for preventing the molding sand from being adhered to the casting in the market still have various problems.
The non-coal-powder green sand for casting, which is disclosed by the publication No. CN101733361B, can be reused although the non-coal-powder green sand does not contain coal powder; the casting mold produced by using the green sand has the advantages of low raw sand consumption, no sand sticking on the surface of the casting, high surface quality, no need of adding coal powder, good recycling property of molding sand, small environmental pollution, high-temperature boxing and productivity improvement, but does not solve the problems of sand sticking caused in different steps in the prior art, sand sticking caused in different steps and the like, so that the method for preventing the oil duct from sticking to the casting is provided.
Disclosure of Invention
The invention aims to provide a method for preventing sand sticking of an oil passage of a casting so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a method for preventing sand sticking of a casting oil passage comprises the following steps of S1: molding sand preparation process, S2: sand box preparation process and S3: a pouring process;
the S1: the preparation process of the molding sand specifically comprises the following steps:
s11: preparing one hundred kilograms of molding sand, selecting 20-40KG of volcanic ash, 14-20KG of kaolin, 8-10KG of quartz sand, 4-5KG of calcium carbonate and 7-10KG of clay, and crushing and screening the large-particle raw materials;
s12: parching molding sand, namely adding 4-6KG of talcum powder, 3-5KG of molecular sieve micro powder, 5-6KG of glass fiber, 2-6KG of nano titanium dioxide, 2-5KG of cross-linked sodium carboxymethylcellulose, 4-6KG of polyglutamic acid, 4-6KG of nano rubber powder and 3-5KG of polyoxyethylene into the molding sand screened by S1, and parching the mixed raw materials at high temperature;
s13: mixing preparation, namely adding 20KG of distilled water into the mixed raw material in S2, stirring by a stirring device, and drying and dehydrating the molding sand after stirring;
the S2: the sand box preparation process specifically comprises the following steps:
s21: preparing a coating paint, selecting 1-2KG of potato starch, 1-2KG of resin, 4-10KG of diatomite, 2-2KG of chromite, 1-2KG of graphite powder, 1-2KG of quartz sand, 2-3KG of bauxite and 2-3KG of kyanite, then stirring, controlling the stirring speed to be 1000r/min, and gradually adding distilled water into the raw materials while stirring;
s22: placing the molding sand in the S1 in a sand box, pounding layer by layer, paving the positions where the sticky sand is easy to occur by adopting heat-resistant high-temperature molding sand, and opening vent holes while pounding the molding sand tightly;
s23: the diameter of a riser on the sand box is kept between 5 and 8cm, and the height of the riser is controlled to be 2 to 3cm lower than the molded surface;
s24: sequentially coating the coatings prepared in the step S21 on the inner sides of the mould grooves of the sand box, and keeping the coating thickness uniform during coating;
the S3: the casting process specifically comprises the following steps:
s31: when pouring is carried out, a water outlet of the pouring ladle is connected with a basin-shaped pouring cup, and the basin-shaped pouring cup is connected with a riser;
s32: when the metal solution is taken out for pouring, cooling the metal solution to 150-200 ℃, and then pouring;
s33: the flask needs to be cooled rapidly after pouring.
Preferably, the raw material in S11 is sieved through a screen after being ground, and is selected to be used in the form of particles with a particle diameter of 3-5 mm.
Preferably, the high-temperature frying in the S12 is carried out at the high temperature of 120-150 ℃ for three minutes.
Preferably, the stirring speed in S13 is 1400 rpm, and the stirring time is 5 minutes.
Preferably, the drying box at 80 ℃ in S13 removes water from the fully-stirred molding sand, so that the molding sand can be kept dry and the moisture is reduced.
Preferably, in the step S21, the stirring is stopped until the paint forms a slender wire, does not cake and does not drip.
Preferably, in S22, the sand-sticking-prone area is pounded with high-temperature-resistant molding sand, and the high-temperature-resistant molding sand is prepared by replacing volcanic ash with zircon sand or chromite sand.
Preferably, the coating application in S24 is realized by using an air pump to spray the coating, and the thickness of the coating spray is 3-5 mm.
Preferably, the height of the casting ladle and the molded surface in the S31 is controlled between 4 cm and 5 cm.
Preferably, the pouring in S32 is completed within twenty to thirty seconds.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, the molding sand can resist high temperature by adjusting the proportion and the raw materials of the molding sand differently, the pores are small, adhesion cannot occur, and various adhesion agents are added into the molding sand when the molding sand is mixed for manufacturing, so that the molding sand has strong adhesion and cannot be adhered to a casting;
(2) the invention carries out proportioning and debugging of raw materials on the coating of the molding sand, so that the coating can be stably adhered to the molding sand when in use, and the coating is sprayed by adopting air pressure, so that the coating can be uniformly smeared on the molding sand, and the coating adopts high-temperature resistant materials and an adhesive, so that the molding sand cannot be adhered to a casting;
(3) according to the invention, damage to the riser or inflow of oxides can be reduced by debugging the riser, the ladle is connected by the sprue cup, the situation that metal solution directly flows into the sprue to cause overhigh temperature of the sprue is prevented, the casting is carried out after the metal solution is cooled, the temperature height after the casting can be prevented, the molding sand is adhered to a casting, and high-temperature-resistant molding sand is adopted in part of positions and prepared by chromite sand or zircon sand.
Drawings
FIG. 1 is a schematic flow chart of the steps of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: a method for preventing sand sticking of an oil duct of a casting comprises the processes of molding sand preparation, sand box preparation and pouring;
the first embodiment is as follows:
s1: the preparation process of the molding sand specifically comprises the following steps:
s11: preparing one hundred kilograms of molding sand, selecting 40KG volcanic ash, 14KG kaolin, 8KG quartz sand, 4KG calcium carbonate and 7KG clay, and crushing and screening the large-particle raw materials;
s12: parching molding sand, namely adding talcum powder 6KG, molecular sieve micro powder 3KG, glass fiber 5KG, nano titanium dioxide 2KG, croscarmellose sodium 2KG, polyglutamic acid 4KG, nano gelatine powder 4KG and polyoxyethylene 3KG into the molding sand screened by S1, and parching the mixed raw materials at high temperature;
s13: mixing preparation, namely adding 20KG of distilled water into the mixed raw material in S2, stirring by a stirring device, and drying and dehydrating the molding sand after stirring;
s2: the sand box preparation process specifically comprises the following steps:
s21: preparing a coating paint, selecting potato starch 2KG, resin 2KG, diatomite 4KG, chromite 2KG, graphite powder 1KG, quartz sand 1KG, bauxite 2KG and kyanite 2KG, then stirring, controlling the stirring speed to be 1000r/min, and gradually adding distilled water into the raw materials while stirring;
s22: placing the molding sand in the S1 in a sand box, pounding layer by layer, paving the positions where the sticky sand is easy to occur by adopting heat-resistant high-temperature molding sand, and opening ventilation openings while pounding the molding sand tightly;
s23: the diameter of the riser on the sand box needs to be kept at 5cm, and the height of the riser needs to be 2cm lower than the molded surface;
s24: sequentially coating the coatings prepared in the step S21 on the inner sides of the mould grooves of the sand box, wherein the coating thickness is kept uniform during coating;
s3: the casting process specifically comprises the following steps:
s31: when pouring is carried out, a water outlet of a pouring ladle needs to be connected with a basin-shaped pouring cup, and the basin-shaped pouring cup is connected with a riser;
s32: when the metal solution is taken out for pouring, the metal solution needs to be cooled to 150 ℃, and then pouring is carried out;
s33: need carry out quick cooling to the sand box after the pouring, prevent that the sand box high temperature from causing molding sand and metal solution to carry out the adhesion.
In order to prevent the sand grains from being too large and causing too large gaps, in this embodiment, it is preferable that the raw material in S11 be sieved through a sieve after grinding, and that the grains have a grain size of 3 to 5 mm.
In order to reduce the water content in the raw materials, in this embodiment, it is preferable that the high-temperature stir-frying in S12 is performed at a high temperature of 120-.
In order to sufficiently mix the molding sand, in this embodiment, it is preferable that the stirring speed in S13 be 1400 rpm and the stirring time be 5 minutes.
In order to reduce moisture and prevent casting deformation, in this embodiment, it is preferable that the molding sand after being sufficiently stirred is dewatered in S13 by a drying oven at 80 degrees celsius, so that the molding sand can be kept dry and moisture is reduced.
In order to improve the blocking property of the coating layer, in this embodiment, it is preferable that the stirring is stopped after the dope is stirred in S21 until the dope is formed into a slender string, does not block and does not drip.
In order to prevent the oxidation due to the excessive casting temperature, in this embodiment, it is preferable that the high temperature resistant molding sand is pounded at a place where the sand sticking easily occurs in S22, and the high temperature resistant molding sand is prepared by replacing the volcanic ash with zircon sand or chromite sand.
In order to make the coating uniform and not cause the casting dimension change, in the embodiment, it is preferable that the coating application in S24 is realized by using an air pump to spray the coating, and the thickness of the coating spray is 3-5 mm.
In order to prevent the ladle from forming a hydrostatic head and prevent the molten metal from flowing into the sprue directly, in the embodiment, the height of the ladle and the molded surface in the step S31 is preferably controlled to be between 4 and 5 cm.
In order to prevent the metal solution from being oxidized, in this embodiment, it is preferable that the metal solution is cooled to a low temperature for casting in order to prevent the metal from being oxidized and prevent the mechanical sand sticking problem, and the metal solution is required to be cooled within twenty seconds to thirty seconds at the time of casting to prevent the metal solution from being unable to flow.
Example two:
s1: the preparation process of the molding sand specifically comprises the following steps:
s11: preparing one hundred kilograms of molding sand, selecting 20KG of volcanic ash, 20KG of kaolin, 10KG of quartz sand, 5KG of calcium carbonate and 10KG of clay, and crushing and screening the large-particle raw materials;
s12: parching molding sand, namely adding talcum powder 4KG, molecular sieve micro powder 5KG, glass fiber 6KG, nano titanium dioxide 6KG, cross-linked sodium carboxymethylcellulose 5KG, polyglutamic acid 6KG, nano rubber powder 6KG and polyethylene oxide 5KG into the molding sand screened by S1, and parching the mixed raw materials at high temperature;
s13: mixing preparation, namely adding 20KG of distilled water into the mixed raw material in S2, stirring by a stirring device, and drying and dehydrating the molding sand after stirring;
s2: the sand box preparation process specifically comprises the following steps:
s21: preparing a coating paint, selecting 1KG of potato starch, 1KG of resin, 10KG of diatomite, 2KG of chromite, 1KG of graphite powder, 1KG of quartz sand, 2KG of bauxite and 2KG of kyanite, then stirring, controlling the stirring speed to be 1000r/min, and gradually adding distilled water into the raw materials while stirring;
s22: placing the molding sand in the S1 in a sand box, pounding layer by layer, paving the positions where the sticky sand is easy to occur by adopting heat-resistant high-temperature molding sand, and opening ventilation openings while pounding the molding sand tightly;
s23: the diameter of the riser on the sand box needs to be kept at 8cm, and the height of the riser needs to be 2-3cm lower than the molded surface;
s24: sequentially coating the coatings prepared in the step S21 on the inner sides of the mould grooves of the sand box, wherein the coating thickness is kept uniform during coating;
s3: the casting process specifically comprises the following steps:
s31: when pouring is carried out, a water outlet of a pouring ladle needs to be connected with a basin-shaped pouring cup, and the basin-shaped pouring cup is connected with a riser;
s32: when the metal solution is taken out for pouring, the metal solution needs to be cooled to 200 ℃, and then pouring is carried out;
s33: need carry out quick cooling to the sand box after the pouring, prevent that the sand box high temperature from causing molding sand and metal solution to carry out the adhesion.
Example three: the difference from the second example lies in the preparation of high temperature resistant molding sand from chromite sand;
s1: the preparation process of the molding sand specifically comprises the following steps:
s11: preparing one hundred kilograms of molding sand, selecting 20KG chromite sand, 20KG kaolin, 10KG quartz sand, 5KG calcium carbonate and 10KG clay, and crushing and screening the large-particle raw materials;
s12: parching molding sand, namely adding talcum powder 4KG, molecular sieve micro powder 5KG, glass fiber 6KG, nano titanium dioxide 6KG, cross-linked sodium carboxymethylcellulose 5KG, polyglutamic acid 6KG, nano rubber powder 6KG and polyethylene oxide 5KG into the molding sand screened by S1, and parching the mixed raw materials at high temperature;
s13: mixing preparation, namely adding 20KG of distilled water into the mixed raw material in S2, stirring by a stirring device, and drying and dehydrating the molding sand after stirring;
s2: the sand box preparation process specifically comprises the following steps:
s21: preparing a coating paint, selecting 1KG of potato starch, 1KG of resin, 10KG of diatomite, 2KG of chromite, 1KG of graphite powder, 1KG of quartz sand, 2KG of bauxite and 2KG of kyanite, then stirring, controlling the stirring speed to be 1000r/min, and gradually adding distilled water into the raw materials while stirring;
s22: placing the molding sand in the S1 in a sand box, pounding layer by layer, paving the positions where the sticky sand is easy to occur by adopting heat-resistant high-temperature molding sand, and simultaneously pounding the molding sand and opening air vents;
s23: the diameter of the riser on the sand box needs to be kept at 8cm, and the height of the riser needs to be 2-3cm lower than the molded surface;
s24: sequentially coating the coatings prepared in the step S21 on the inner sides of the mould grooves of the sand box, wherein the coating thickness is kept uniform during coating;
s3: the casting process specifically comprises the following steps:
s31: when pouring is carried out, a water outlet of a pouring ladle needs to be connected with a basin-shaped pouring cup, and the basin-shaped pouring cup is connected with a riser;
s32: when the metal solution is taken out for pouring, the metal solution needs to be cooled to 200 ℃, and then pouring is carried out;
s33: need carry out quick cooling to the sand box after the pouring, prevent that the sand box high temperature from causing molding sand and metal solution to carry out the adhesion.
Example four: the difference from the third example is that chromite sand was replaced by zircon sand;
s1: the preparation process of the molding sand specifically comprises the following steps:
s11: preparing one hundred kilograms of molding sand, selecting 20KG of zircon sand, 20KG of kaolin, 10KG of quartz sand, 5KG of calcium carbonate and 10KG of clay, and crushing and screening the large-particle raw materials;
s12: parching molding sand, namely adding talcum powder 4KG, molecular sieve micro powder 5KG, glass fiber 6KG, nano titanium dioxide 6KG, cross-linked sodium carboxymethylcellulose 5KG, polyglutamic acid 6KG, nano rubber powder 6KG and polyethylene oxide 5KG into the molding sand screened by S1, and parching the mixed raw materials at high temperature;
s13: mixing preparation, namely adding 20KG of distilled water into the mixed raw material in S2, stirring by a stirring device, and drying and dehydrating the molding sand after stirring;
s2: the sand box preparation process specifically comprises the following steps:
s21: preparing a coating paint, selecting 1KG of potato starch, 1KG of resin, 10KG of diatomite, 2KG of chromite, 1KG of graphite powder, 1KG of quartz sand, 2KG of bauxite and 2KG of kyanite, then stirring, controlling the stirring speed to be 1000r/min, and gradually adding distilled water into the raw materials while stirring;
s22: placing the molding sand in the S1 in a sand box, pounding layer by layer, paving the positions where the sticky sand is easy to occur by adopting heat-resistant high-temperature molding sand, and simultaneously pounding the molding sand and opening air vents;
s23: the diameter of the riser on the sand box needs to be kept at 8cm, and the height of the riser needs to be 2-3cm lower than the molded surface;
s24: sequentially coating the coatings prepared in the step S21 on the inner sides of the mould grooves of the sand box, wherein the coating thickness is kept uniform during coating;
s3: the casting process specifically comprises the following steps:
s31: when pouring is carried out, a water outlet of a pouring ladle needs to be connected with a basin-shaped pouring cup, and the basin-shaped pouring cup is connected with a riser;
s32: when the metal solution is taken out for pouring, the metal solution needs to be cooled to 200 ℃, and then pouring is carried out;
s33: need carry out quick cooling to the sand box after the pouring, prevent that the sand box high temperature from causing molding sand and metal solution to carry out the adhesion.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A method for preventing sand sticking of an oil duct of a casting is characterized by comprising the following steps: including S1: molding sand preparation process, S2: sand box preparation process and S3: a pouring process;
the S1: the preparation process of the molding sand specifically comprises the following steps:
s11: preparing one hundred kilograms of molding sand, selecting 20-40KG of volcanic ash, 14-20KG of kaolin, 8-10KG of quartz sand, 4-5KG of calcium carbonate and 7-10KG of clay, and crushing and screening the large-particle raw materials;
s12: parching molding sand, namely adding 4-6KG of talcum powder, 3-5KG of molecular sieve micro powder, 5-6KG of glass fiber, 2-6KG of nano titanium dioxide, 2-5KG of cross-linked sodium carboxymethylcellulose, 4-6KG of polyglutamic acid, 4-6KG of nano rubber powder and 3-5KG of polyoxyethylene into the molding sand screened by S1, and parching the mixed raw materials at high temperature;
s13: mixing preparation, namely adding 20KG of distilled water into the mixed raw material in S2, stirring by a stirring device, and drying and dehydrating the molding sand after stirring;
the S2: the sand box preparation process specifically comprises the following steps:
s21: preparing a coating paint, selecting 1-2KG of potato starch, 1-2KG of resin, 4-10KG of diatomite, 2-2KG of chromite, 1-2KG of graphite powder, 1-2KG of quartz sand, 2-3KG of bauxite and 2-3KG of kyanite, then stirring, controlling the stirring speed to be 1000r/min, and gradually adding distilled water into the raw materials while stirring;
s22: placing the molding sand in the S1 in a sand box, pounding layer by layer, paving the positions where the sticky sand is easy to occur by adopting heat-resistant high-temperature molding sand, and opening vent holes while pounding the molding sand tightly;
s23: the diameter of a riser on the sand box is kept between 5 and 8cm, and the height of the riser is controlled to be 2 to 3cm lower than the molded surface;
s24: sequentially coating the coatings prepared in the step S21 on the inner sides of the mould grooves of the sand box, and keeping the coating thickness uniform during coating;
the S3: the casting process specifically comprises the following steps:
s31: when pouring is carried out, a water outlet of the pouring ladle is connected with a basin-shaped pouring cup, and the basin-shaped pouring cup is connected with a riser;
s32: when the metal solution is taken out for pouring, cooling the metal solution to 150-200 ℃, and then pouring;
s33: the flask needs to be cooled rapidly after pouring.
2. The method for preventing sand sticking to the oil passage of the casting according to claim 1, wherein the method comprises the following steps: the raw material in S11 is sieved through a screen after being ground, and the granules with the diameter of 3-5mm are selected for use.
3. The method for preventing sand sticking to the oil passage of the casting according to claim 1, wherein the method comprises the following steps: and the high-temperature stir-frying in the S12 is carried out at the high temperature of 120-150 ℃ for three minutes.
4. The method for preventing sand sticking to the oil passage of the casting according to claim 1, wherein the method comprises the following steps: the stirring speed in S13 was 1400 rpm, and the stirring time was 5 minutes.
5. The method for preventing sand sticking to the oil passage of the casting according to claim 1, wherein the method comprises the following steps: the molding sand after the intensive mixing is dewatered through the drying cabinet of 80 degrees centigrade in the S13 for the molding sand can keep dry, reduces moisture.
6. The method for preventing sand sticking to the oil passage of the casting according to claim 1, wherein the method comprises the following steps: and in the step S21, the stirring is stopped until the paint forms slender stringy, does not agglomerate and does not drip.
7. The method for preventing sand sticking to the oil passage of the casting according to claim 1, wherein the method comprises the following steps: in the S22, high-temperature resistant molding sand is used for pounding in places where sand sticking easily occurs, and the preparation scheme of the high-temperature resistant molding sand is to replace volcanic ash with zircon sand or chromite sand for preparation.
8. The method for preventing sand sticking to the oil passage of the casting according to claim 1, wherein the method comprises the following steps: and coating in the S24 is carried out by adopting an air pump to spray the coating, and the sprayed thickness of the coating is 3-5 mm.
9. The method for preventing sand sticking to the oil passage of the casting according to claim 1, wherein the method comprises the following steps: the height of the casting ladle and the molded surface in the S31 is controlled between 4 cm and 5 cm.
10. The method for preventing sand sticking to the oil passage of the casting according to claim 1, wherein the method comprises the following steps: the pouring time control in S32 is completed within twenty to thirty seconds.
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| CN202010639144.7A CN111618235A (en) | 2020-07-06 | 2020-07-06 | Method for preventing sand sticking of oil duct of casting |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116117071A (en) * | 2022-12-27 | 2023-05-16 | 安徽华聚新材料有限公司 | Molding sand capable of preventing air holes from being formed and preparation method thereof |
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2020
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| CN101172302A (en) * | 2007-09-29 | 2008-05-07 | 沈阳铸造研究所 | Modified silicate-bonded sand temperature core box core-producing technique |
| CN101497105A (en) * | 2009-03-12 | 2009-08-05 | 深圳市景鼎现代科技有限公司 | Cast form water borne coating and technique for preparing the same |
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