CN102873263B - Lost foam casting technology for sand burning-resistance cast steel - Google Patents
Lost foam casting technology for sand burning-resistance cast steel Download PDFInfo
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- CN102873263B CN102873263B CN201210320026.5A CN201210320026A CN102873263B CN 102873263 B CN102873263 B CN 102873263B CN 201210320026 A CN201210320026 A CN 201210320026A CN 102873263 B CN102873263 B CN 102873263B
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- 238000010114 lost-foam casting Methods 0.000 title claims abstract description 22
- 239000004576 sand Substances 0.000 title claims abstract description 20
- 229910001208 Crucible steel Inorganic materials 0.000 title claims abstract description 16
- 238000005516 engineering process Methods 0.000 title abstract description 5
- 239000011248 coating agent Substances 0.000 claims abstract description 81
- 238000000576 coating method Methods 0.000 claims abstract description 81
- 238000005266 casting Methods 0.000 claims abstract description 42
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 42
- KBPLFHHGFOOTCA-UHFFFAOYSA-N caprylic alcohol Natural products CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 claims description 36
- 238000001035 drying Methods 0.000 claims description 23
- 229940092782 bentonite Drugs 0.000 claims description 21
- 229910000278 bentonite Inorganic materials 0.000 claims description 21
- 239000000440 bentonite Substances 0.000 claims description 21
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 21
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 claims description 21
- 229940080314 sodium bentonite Drugs 0.000 claims description 21
- 229910000280 sodium bentonite Inorganic materials 0.000 claims description 21
- 239000007864 aqueous solution Substances 0.000 claims description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 20
- 239000002002 slurry Substances 0.000 claims description 20
- 239000006260 foam Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 19
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 18
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 18
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 claims description 18
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 18
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 18
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 18
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 18
- 244000035744 Hura crepitans Species 0.000 claims description 15
- 229910052804 chromium Inorganic materials 0.000 claims description 11
- 239000011651 chromium Substances 0.000 claims description 11
- 229910052593 corundum Inorganic materials 0.000 claims description 11
- 239000010431 corundum Substances 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 235000019353 potassium silicate Nutrition 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 11
- 239000010453 quartz Substances 0.000 claims description 11
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 7
- 238000011049 filling Methods 0.000 claims description 5
- 239000002985 plastic film Substances 0.000 claims description 5
- 229920006255 plastic film Polymers 0.000 claims description 5
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 13
- 239000010959 steel Substances 0.000 abstract description 13
- 239000002245 particle Substances 0.000 abstract description 5
- 238000004458 analytical method Methods 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract description 3
- 230000009545 invasion Effects 0.000 abstract description 2
- 230000009970 fire resistant effect Effects 0.000 abstract 1
- 238000005187 foaming Methods 0.000 abstract 1
- 239000011521 glass Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 37
- 230000007547 defect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 239000003110 molding sand Substances 0.000 description 2
- 239000006060 molten glass Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Mold Materials And Core Materials (AREA)
Abstract
The invention relates to a lost foam casting technology for sand burning-resistance cast steel. The lost foam casting technology comprises the following steps of: fabricating a model cluster, preparing coating for an inner layer, preparing coating for an outer layer, dealing with the lost foaming casting pattern with the coating for the inner layer and the coating for the outer layer, performing vibration modeling, casting and replacing, cooling and the like. From analysis on coating relic, the coating is not invaded by liquid steel, melted glass is filled among fire-resistant aggregate particles of the inner layer of the coating, thereby preventing invasion of the liquid steel and avoiding sand burning of the casting at the same time.
Description
Technical Field
The invention relates to the field of casting, in particular to the technical field of lost foam cast steel manufacturing, and specifically relates to a sand-sticking-resistant cast steel lost foam casting process.
Background
Lost foam casting (also called solid casting) is a novel casting method which comprises the steps of bonding foam models with similar sizes and shapes to form a model cluster, brushing refractory paint, drying, burying in dry quartz sand for vibration molding, pouring under negative pressure to gasify the model, enabling liquid metal to occupy the position of the model, solidifying and cooling to form the casting.
Compared with the traditional casting technology, the lost foam casting has the following characteristics: 1. the casting has good quality and low cost; 2. the materials are not limited, and the sizes are suitable; 3. the size precision is high, the surface is smooth, and the cleaning workload is reduced; 4. the internal defects are greatly reduced, and the tissue is compact; 5. can realize large-scale and mass production, greatly improve the working environment, reduce the labor intensity and reduce the energy consumption.
Although the lost foam casting process is currently being developed relatively quickly, the coating technology has not met the ideal requirements. Because of the quality of coating performance direct influence foundry goods, the coating is except keeping apart the direct contact of metal liquid and molding sand, prevents that the foundry goods from producing mechanical sand sticking and chemical sand sticking, still has an important function: forming and maintaining a casting cavity. Therefore, it is necessary to have high room temperature strength and high temperature strength and to have suitable high temperature air permeability.
However, the quality of the existing coating has various defects, such as that in the production of cast steel, after the casting is cooled, the lost foam coating is not easy to peel off from the casting, and the subsequent grinding wheel polishing treatment cost is greatly increased.
Aiming at the phenomenon, the applicant analyzes the coating fragments, the inner layer of the coating is directly contacted with molten steel, and the outer layer of the coating is directly contacted with molding sand. During casting, the high-temperature molten steel can wet the inner coating layer and immerse the inner coating layer into gaps among coating aggregate particles. After the casting is finished, in the process of slowly cooling the casting, the coating and the casting are condensed into a whole by the molten steel, so that the coating is difficult to peel off from the surface of the casting.
From the above analysis, it is known that this phenomenon can be avoided only if the molten steel cannot infiltrate into the gaps of the aggregate particles, forming a distinct boundary. However, as the aggregate particles cannot be too small, otherwise, the air permeability is reduced, the gasified product of the pattern cannot be smoothly penetrated out, and the phenomena of air holes and slag inclusion are caused, so that the quality of the casting is reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the applicant adjusts the formula of the coating, so that a layer of molten glass phase can be generated in the coating during high-temperature pouring, and the molten steel can be successfully prevented from permeating into the refractory aggregate.
The invention aims to provide a sand-sticking-resistant lost foam casting process for cast steel.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
a sand-sticking-resistant lost foam casting process for casting steel comprises the following steps:
1) bonding and combining foam models with similar sizes and shapes with the castings to form a model cluster;
2) preparing an inner layer coating:
a) adding water into bentonite, and stirring at a high speed to obtain bentonite slurry;
b) adding water glass, sodium carboxymethylcellulose, n-octanol and fatty alcohol-polyoxyethylene ether into water to prepare an aqueous solution;
c) adding the bentonite slurry and the quartz powder obtained in the step a) into the aqueous solution obtained in the step b), and adding water under continuous stirring to prepare an inner layer coating;
3) preparing an outer layer coating:
d) adding water into sodium bentonite, and stirring at a high speed to obtain sodium bentonite slurry;
e) adding the white sol, sodium carboxymethylcellulose, n-octanol and fatty alcohol-polyoxyethylene ether into water to prepare an aqueous solution;
f) adding the sodium bentonite slurry obtained in the step d) and the high-chromium corundum into the aqueous solution obtained in the step e), and adding water under continuous stirring to prepare an outer layer coating;
4) firstly immersing the lost foam pattern into the inner layer coating, taking out and drying; after drying, coating an outer layer coating in a hanging way, and drying;
5) placing the model obtained in the step 4) in a sandbox, filling dry sand, vibrating to compact, covering a plastic film on the sandbox, and vacuumizing the sandbox;
6) and casting the molten metal into a model area, gasifying the lost foam, replacing the model with the metal, and cooling and taking out the casting.
Further, the mixture ratio of the components for preparing the inner layer coating in the step 2) is as follows: 25-75 parts of quartz powder, 1-3 parts of bentonite, 0.5-1.5 parts of water glass, 0.75-2.25 parts of sodium carboxymethylcellulose, 0.15-0.45 part of n-octanol and 0.15-0.45 part of fatty alcohol-polyoxyethylene ether.
In the embodiment of the invention, the mixture ratio of the components for preparing the inner layer coating in the step 2) is as follows: 50 parts of quartz powder, 2 parts of bentonite, 1 part of water glass, 1.5 parts of sodium carboxymethylcellulose, 0.3 part of n-octanol and 0.3 part of fatty alcohol-polyoxyethylene ether.
In the step a), the weight ratio of the bentonite to the added water is 1: 10; in the step b), the weight ratio of the water glass to the added water is 1: 20; in step c), the weight ratio of the quartz powder to the water added under continuous stirring is 1: 1.
Further, the mixture ratio of the components for preparing the outer layer coating in the step 3) is as follows: 25-75 parts of high-chromium corundum, 1.5-4.5 parts of sodium bentonite, 0.25-0.75 part of white sol, 0.75-2.25 parts of sodium carboxymethylcellulose, 0.15-0.45 part of n-octanol and 0.15-0.45 part of fatty alcohol-polyoxyethylene ether.
In the embodiment of the invention, the mixture ratio of the components for preparing the outer layer coating in the step 3) is as follows: 50 parts of high-chromium corundum, 3 parts of sodium bentonite, 0.5 part of white sol, 1.5 parts of sodium carboxymethylcellulose, 0.3 part of n-octanol and 0.3 part of fatty alcohol-polyoxyethylene ether.
In the step d), the weight ratio of the sodium bentonite to the added water is 1: 10; in the step e), the weight ratio of the white sol to the added water is 1: 40; in step f), the weight ratio of the high-chromium corundum to the water added under continuous stirring is 1: 1.
Further, the stirring mode in the steps c) and f) is as follows: firstly stirring at a high speed for 1 hour, then stirring at a low speed to discharge gas involved in the inner layer coating and the outer layer coating, and keeping stirring at the low speed for about 10 hours.
In the embodiment of the invention, the number of times of hanging coating the outer layer paint in the step 4) is 2-5 times. The drying temperature is 40-60 ℃, and the drying time is 2-8 hours.
The invention has the following beneficial effects: after the casting is cooled, most of the smear is automatically stripped from the surface of the casting, and the stripping effect is prominent. Even if a small part of the coating is not peeled off, the subsequent treatment is greatly simplified, and a large amount of labor is saved. Through the analysis of the paint fragments, the coating is not invaded by molten steel, and the refractory aggregate particles in the inner layer of the coating are filled by molten glass phase, so that the invasion of the molten steel is prevented, and the sand sticking phenomenon of a casting is avoided.
Drawings
FIG. 1 is a flow chart of the sand adhesion preventing cast steel lost foam casting process disclosed by the invention.
Detailed Description
The present invention is further illustrated by the following examples, which should not be construed as limiting the scope of the invention.
Example 1
A sand-sticking-resistant lost foam casting process for casting steel comprises the following steps:
1) bonding and combining foam models with similar sizes and shapes with the castings to form a model cluster;
2) preparing an inner layer coating:
a) adding 10 parts by weight of water into 1 part by weight of bentonite, and stirring at a high speed for 5 hours to obtain bentonite slurry;
b) adding 1.5 parts by weight of water glass, 2.25 parts by weight of sodium carboxymethylcellulose, 0.15 part by weight of n-octanol and 0.45 part by weight of fatty alcohol-polyoxyethylene ether into 30 parts by weight of water to prepare an aqueous solution;
c) adding the bentonite slurry obtained in the step a) and 25 parts by weight of quartz powder into the aqueous solution obtained in the step b), adding 25 parts by weight of water under continuous stirring, and mixing to prepare the inner layer coating, wherein the stirring mode is as follows: firstly stirring at a high speed for 1 hour, then stirring at a low speed to discharge gas involved in the inner layer coating, and keeping stirring at the low speed for 8 hours;
3) preparing an outer layer coating:
d) adding 15 parts by weight of water into 1.5 parts by weight of sodium bentonite, and stirring at a high speed for 7 hours to obtain sodium bentonite slurry;
e) adding 0.75 weight part of white sol, 2.25 weight parts of sodium carboxymethylcellulose, 0.15 weight part of n-octanol and 0.45 weight part of fatty alcohol-polyoxyethylene ether into 30 weight parts of water to prepare an aqueous solution;
f) adding the sodium bentonite slurry obtained in the step d) and 25 parts by weight of high-chromium corundum into the aqueous solution obtained in the step e), and adding 25 parts by weight of water under continuous stirring to prepare an outer coating, wherein the stirring mode is as follows: stirring at a high speed for 1 hour, then stirring at a low speed to discharge gas involved in the outer layer coating, and keeping stirring at the low speed for 11 hours;
4) firstly immersing the lost foam pattern into the inner layer coating, taking out and drying; after drying, coating an outer layer coating in a hanging way, and drying;
5) placing the model obtained in the step 4) in a sandbox, filling dry sand, vibrating to compact, covering a plastic film on the sandbox, and vacuumizing the sandbox;
6) and casting the molten metal into a model area, gasifying the lost foam, replacing the model with the metal, and cooling and taking out the casting.
Example 2
A sand-sticking-resistant lost foam casting process for casting steel comprises the following steps:
1) bonding and combining foam models with similar sizes and shapes with the castings to form a model cluster;
2) preparing an inner layer coating:
a) adding 30 parts by weight of water into 3 parts by weight of bentonite, and stirring at a high speed for 7 hours to obtain bentonite slurry;
b) adding 0.5 part by weight of water glass, 0.75 part by weight of sodium carboxymethylcellulose, 0.45 part by weight of n-octanol and 0.15 part by weight of fatty alcohol-polyoxyethylene ether into 10 parts by weight of water to prepare an aqueous solution;
c) adding the bentonite slurry obtained in the step a) and 75 parts by weight of quartz powder into the aqueous solution obtained in the step b), adding 75 parts by weight of water under continuous stirring, and mixing to prepare the inner layer coating, wherein the stirring mode is as follows: firstly stirring at a high speed for 1 hour, then stirring at a low speed to discharge gas involved in the inner layer coating, and keeping stirring at the low speed for 10 hours;
3) preparing an outer layer coating:
d) adding 45 parts by weight of water into 4.5 parts by weight of sodium bentonite, and stirring at a high speed for 5 hours to obtain sodium bentonite slurry;
e) adding 0.75 weight part of white sol, 0.75 weight part of sodium carboxymethylcellulose, 0.15 weight part of n-octanol and 0.45 weight part of fatty alcohol-polyoxyethylene ether into 30 weight parts of water to prepare an aqueous solution;
f) adding the sodium bentonite slurry obtained in the step d) and 75 parts by weight of high-chromium corundum into the aqueous solution obtained in the step e), and adding 75 parts by weight of water under continuous stirring to prepare an outer coating, wherein the stirring mode is as follows: stirring at a high speed for 1 hour, then stirring at a low speed to discharge gas involved in the outer coating, and keeping stirring at the low speed for 10 hours;
4) firstly immersing the lost foam pattern into the inner layer coating, taking out and drying; after drying, coating an outer layer coating in a hanging way, and drying;
5) placing the model obtained in the step 4) in a sandbox, filling dry sand, vibrating to compact, covering a plastic film on the sandbox, and vacuumizing the sandbox;
6) and casting the molten metal into a model area, gasifying the lost foam, replacing the model with the metal, and cooling and taking out the casting.
Example 3
A sand-sticking-resistant lost foam casting process for casting steel comprises the following steps:
1) bonding and combining foam models with similar sizes and shapes with the castings to form a model cluster;
2) preparing an inner layer coating:
a) adding 20 parts by weight of water into 2 parts by weight of bentonite, and stirring at a high speed for 6 hours to obtain bentonite slurry;
b) adding 1 weight part of water glass, 1.5 weight parts of sodium carboxymethylcellulose, 0.3 weight part of n-octanol and 0.3 weight part of fatty alcohol-polyoxyethylene ether into 20 weight parts of water to prepare an aqueous solution;
c) adding the bentonite slurry obtained in the step a) and 50 parts by weight of quartz powder into the aqueous solution obtained in the step b), adding 50 parts by weight of water under continuous stirring, and mixing to prepare the inner layer coating, wherein the stirring mode is as follows: firstly stirring at a high speed for 1 hour, then stirring at a low speed to discharge gas involved in the inner layer coating, and keeping stirring at the low speed for 11 hours;
3) preparing an outer layer coating:
d) adding 30 parts by weight of water into 3 parts by weight of sodium bentonite, and stirring at a high speed for 6 hours to obtain sodium bentonite slurry;
e) adding 0.5 part by weight of white sol, 1.5 parts by weight of sodium carboxymethylcellulose, 0.3 part by weight of n-octanol and 0.3 part by weight of fatty alcohol-polyoxyethylene ether into 20 parts by weight of water to prepare an aqueous solution;
f) adding the sodium bentonite slurry obtained in the step d) and 50 parts by weight of high-chromium corundum into the aqueous solution obtained in the step e), adding 50 parts by weight of water under continuous stirring to prepare an outer coating, wherein the stirring mode is as follows: stirring at a high speed for 1 hour, then stirring at a low speed to discharge gas involved in the outer layer coating, and keeping stirring at the low speed for 11 hours;
4) firstly immersing the lost foam pattern into the inner layer coating, taking out and drying; after drying, coating an outer layer coating in a hanging way, and drying;
5) placing the model obtained in the step 4) in a sandbox, filling dry sand, vibrating to compact, covering a plastic film on the sandbox, and vacuumizing the sandbox;
6) and casting the molten metal into a model area, gasifying the lost foam, replacing the model with the metal, and cooling and taking out the casting.
In the embodiment of the invention, the outer coating can be hung for a plurality of times, for example, 2 to 5 times according to the casting condition. In addition, in order to reduce the gas evolution during pouring and ensure the quality of castings, the foam plastic model must be dried after being coated with the coating, enough drying time is ensured to ensure that the coating is dried and dried thoroughly, the temperature is controlled at 40-60 ℃ for 2-8 hours, microwave drying is used if necessary, and the drying process can be completed in a short time.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; it is intended that the following claims be interpreted as including all such alterations, modifications, and equivalents as fall within the true spirit and scope of the invention.
Claims (8)
1. The sand adhesion preventing lost foam casting process for the cast steel is characterized by comprising the following steps of:
1) bonding and combining foam models with similar sizes and shapes with the castings to form a model cluster;
2) preparing an inner layer coating:
a) adding water into bentonite, and stirring at a high speed to obtain bentonite slurry;
b) adding water glass, sodium carboxymethylcellulose, n-octanol and fatty alcohol-polyoxyethylene ether into water to prepare an aqueous solution;
c) adding the bentonite slurry and the quartz powder obtained in the step a) into the aqueous solution obtained in the step b), and adding water under continuous stirring to prepare an inner layer coating;
3) preparing an outer layer coating:
d) adding water into sodium bentonite, and stirring at a high speed to obtain sodium bentonite slurry;
e) adding the white sol, sodium carboxymethylcellulose, n-octanol and fatty alcohol-polyoxyethylene ether into water to prepare an aqueous solution;
f) adding the sodium bentonite slurry obtained in the step d) and the high-chromium corundum into the aqueous solution obtained in the step e), and adding water under continuous stirring to prepare an outer layer coating;
4) firstly immersing the lost foam pattern into the inner layer coating, taking out and drying; after drying, coating an outer layer coating in a hanging way, and drying;
5) placing the model obtained in the step 4) in a sandbox, filling dry sand, vibrating to compact, covering a plastic film on the sandbox, and vacuumizing the sandbox;
6) casting the molten metal into a model area, gasifying the lost foam, replacing the model with the metal, and cooling and taking out the casting; wherein,
the mixture ratio of each component for preparing the inner layer coating in the step 2) is as follows: 25-75 parts of quartz powder, 1-3 parts of bentonite, 0.5-1.5 parts of water glass, 0.75-2.25 parts of sodium carboxymethylcellulose, 0.15-0.45 part of n-octanol and 0.15-0.45 part of fatty alcohol-polyoxyethylene ether;
the mixture ratio of the components for preparing the outer layer coating in the step 3) is as follows: 25-75 parts of high-chromium corundum, 1.5-4.5 parts of sodium bentonite, 0.25-0.75 part of white sol, 0.75-2.25 parts of sodium carboxymethylcellulose, 0.15-0.45 part of n-octanol and 0.15-0.45 part of fatty alcohol-polyoxyethylene ether.
2. The sand adhesion preventing cast steel lost foam casting process according to claim 1, wherein the ratio of each component for preparing the inner layer coating in the step 2) is as follows: 50 parts of quartz powder, 2 parts of bentonite, 1 part of water glass, 1.5 parts of sodium carboxymethylcellulose, 0.3 part of n-octanol and 0.3 part of fatty alcohol-polyoxyethylene ether.
3. The sand adhesion preventing cast steel lost foam casting process according to claim 1 or 2, characterized in that in step a), the weight ratio of bentonite to added water is 1: 10; in the step b), the weight ratio of the water glass to the added water is 1: 20; in step c), the weight ratio of the quartz powder to the water added under continuous stirring is 1: 1.
4. The sand adhesion preventing cast steel lost foam casting process according to claim 1, wherein the mixture ratio of the components for preparing the outer coating in the step 3) is as follows: 50 parts of high-chromium corundum, 3 parts of sodium bentonite, 0.5 part of white sol, 1.5 parts of sodium carboxymethylcellulose, 0.3 part of n-octanol and 0.3 part of fatty alcohol-polyoxyethylene ether.
5. The sand adhesion preventing cast steel lost foam casting process according to claim 1 or 4, characterized in that in step d), the weight ratio of sodium bentonite to added water is 1: 10; in the step e), the weight ratio of the white sol to the added water is 1: 40; in step f), the weight ratio of the high-chromium corundum to the water added under continuous stirring is 1: 1.
6. The sand release resistant cast steel lost foam casting process of claim 1, wherein the stirring mode in steps c) and f) is as follows: firstly stirring at a high speed for 1 hour, then stirring at a low speed to discharge gas involved in the inner layer coating and the outer layer coating, and keeping stirring at the low speed for about 10 hours.
7. The sand adhesion preventing cast steel lost foam casting process according to claim 1, wherein in step 4), the outer layer coating is hung 2-5 times.
8. The sand adhesion preventing cast steel lost foam casting process as claimed in claim 1, wherein in the step 4), the drying temperature is 40-60 ℃ and the drying time is 2-8 hours.
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| CN201210320026.5A CN102873263B (en) | 2012-08-31 | 2012-08-31 | Lost foam casting technology for sand burning-resistance cast steel |
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| CN201210320026.5A CN102873263B (en) | 2012-08-31 | 2012-08-31 | Lost foam casting technology for sand burning-resistance cast steel |
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| CN102873263B true CN102873263B (en) | 2014-09-17 |
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| CN103418745A (en) * | 2013-07-12 | 2013-12-04 | 西华大学 | String casting method for filling sand mold lost foams piece by piece (group) |
| CN104226905B (en) * | 2014-09-01 | 2016-07-06 | 山西模范机械制造有限公司 | The technique ensureing lost foam casting dry type internal combustion engine cylinders water channel cleaning |
| 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 |
| CN107470551B (en) * | 2017-08-26 | 2019-04-30 | 唐山市鸿泉矿山机械有限公司 | A kind of mold wash and its preparation method |
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| JPS57109539A (en) * | 1980-12-27 | 1982-07-08 | Akaishi Kozan Kk | Casting sand for preventing sand burning of casting and method of application |
| JPH1157937A (en) * | 1997-08-22 | 1999-03-02 | Isuzu Motors Ltd | Method for casting piston by lost foam process |
| CN101817058A (en) * | 2010-03-30 | 2010-09-01 | 深圳市景鼎现代科技有限公司 | Shield type coating composition and preparation process of coating thereof |
| CN102039372A (en) * | 2011-01-11 | 2011-05-04 | 大连鸿骏源机械有限公司 | Lost foam casting method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1011124B (en) * | 1986-10-03 | 1991-01-09 | 刘汉生 | Quick drying steel casting paint |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57109539A (en) * | 1980-12-27 | 1982-07-08 | Akaishi Kozan Kk | Casting sand for preventing sand burning of casting and method of application |
| JPH1157937A (en) * | 1997-08-22 | 1999-03-02 | Isuzu Motors Ltd | Method for casting piston by lost foam process |
| CN101817058A (en) * | 2010-03-30 | 2010-09-01 | 深圳市景鼎现代科技有限公司 | Shield type coating composition and preparation process of coating thereof |
| CN102039372A (en) * | 2011-01-11 | 2011-05-04 | 大连鸿骏源机械有限公司 | Lost foam casting method |
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