CN103521692A - Molding sand for casting aluminum and preparation method thereof - Google Patents
Molding sand for casting aluminum and preparation method thereof Download PDFInfo
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- CN103521692A CN103521692A CN201310481178.8A CN201310481178A CN103521692A CN 103521692 A CN103521692 A CN 103521692A CN 201310481178 A CN201310481178 A CN 201310481178A CN 103521692 A CN103521692 A CN 103521692A
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Abstract
The invention relates to molding sand for casting aluminum. The molding sand for casting aluminum is characterized by comprising the following materials in parts by weight: 240-260 parts of fresh sand, 50-60 parts of bentonite, 5-8 parts of lignin, 1-2 parts of sodium benzoate, 9-12 parts of nanoscale ceramic powder, 3-6 parts of sodium alginate, 1-2 parts of ethyl silicate, 70-80 parts of titanium dioxide, 3-5 parts of sodium hexametaphosphate, 2-3 parts of polyvinyl alcohol, 1-2 parts of tributyl phosphate and a proper amount of water. Fresh sand and bentonite are calcined, ground separately and then calcined at high temperature, so that the molding sand is smooth and has excellent air permeability, caking property, toughness and plasticity; and besides, the nanoscale ceramic powder and cornstarch are adopted, so that the molding sand is high in degree of finish and smoothness, low in shrink rate, good in high-temperature collapsibility and unlikely to crack, and is suitable for casting aluminum products, phenomena of shrinkage cavities, shrinkage porosity, peeling and slag holes under the skin are reduced, the surface is bright and clean and the size is standard.
Description
Technical field
The present invention relates to a kind of casting field, relate in particular to a kind of molding sand for cast aluminium and preparation method thereof.
Background technology
Molding sand is in casting, to be used for the material of moulding.Molding sand is generally mixed according to a certain percentage by Modeling Materials such as Foundry sand, moulding sand binder and additional things, also available natural silica sand argillaceous, the sand formulation Sand particle diameter that common cast aluminium is used is too large or too little, molding sand material footpath is too large, although gas permeability is better, aloxite part surface ratio is more coarse, fineness is bad, molding sand material footpath is too little, causes sand mold gas permeability bad, and aluminium casting has pore to produce.Domestic and international widely used coal dust clay green-sand, generally by the mixed system of roughing sand, binding agent, coal dust additive etc. and water, formed, there is certain anti-scab effect and the cost of material is low, production efficiency is high, but its consumption is large, discharge is serious, at casting process coal dust firing, decompose and produce toxic gas and pollute.
Molding sand is different by binding agent used, can be divided into clay-bonded sand, water-glass sand, cement bonded sand, quartz sand etc., and that with clay-bonded sand, water-glass sand and quartz sand, uses is maximum.The effect of molding sand in Foundry Production is very important, and the casting wasted product causing because of the poor quality of molding sand accounts for 30～50% of the total waste product of foundry goods.Conventionally to the requirement of molding sand, be: 1, there is higher intensity and heat endurance, to bear the effect of various external force and high temperature.2, good mobility, the ability that molding sand mutually moves between sand grains under external force or Action of Gravity Field own.3, certain plasticity, molding sand is out of shape under external force, can keep the ability of the shape that gives after external force is removed.4, good gas permeability, molding sand hole sees through the ability of gas.5, high collapsibility, weighs up again grittiness, and after casting solidification, whether molding sand easily destroys, the performance of whether easily removing from foundry goods.
Current casting field development rapidly, higher for the performance requirement of steel-casting and ironcasting, thereby require further to promote the performance of molding sand.
Summary of the invention
The object of the present invention is to provide a kind of molding sand for cast aluminium and preparation method thereof, that this molding sand has is moist, good permeability, feature that collapsibility is good.
Technical scheme of the present invention is as follows:
For a molding sand for cast aluminium, it is characterized in that being made by the raw material of following weight portion: fresh sand 240-260, bentonite 50-60, lignin 5-8, Sodium Benzoate 1-2, nanometer scale ceramics powder 9-12, sodium alginate 3-6, silester 1-2, titanium dioxide 70-80, calgon 3-5, polyvinyl alcohol 2-3, tributyl phosphate 1-2, water are appropriate;
The preparation method of the described molding sand for cast aluminium, it is characterized in that comprising the following steps: fresh sand, bentonite are put into 450-480 ℃ of calcining furnace and calcine 3-4 hour, then, take out, be ground into 200-400 order powder, then add sodium alginate, silester, titanium dioxide, suitable quantity of water, dispersed with stirring, pugging, sends in 1460-1480 ℃ of calcining furnace and calcines 4-5 hour, taking-up is crushed to 50-100 order, obtains calcining material; Lignin, Sodium Benzoate, nanometer scale ceramics powder, tributyl phosphate are mixed, grind 20-30 minute, then mix with other residual components, add and be equivalent to water wet mixing 10-15 minute of compound 3-5% and get final product.
Beneficial effect of the present invention
The present invention by fresh sand, bentonite calcining, dispersion grinding, high temperature is forged again, makes molding sand smooth, has excellent gas permeability, caking property, toughness, plasticity, nanometer scale ceramics powder, Cornstarch have been used simultaneously, not only improved fineness, smoothness, and make molding sand shrinkage factor low, not easy to crack, high temperature collapsibility is good, is applicable to the casting of aluminum products, and shrinkage cavity and porosity, peeling, subcutaneous cinder hole reduce, any surface finish, dimensional standard.
The specific embodiment
For a molding sand for cast aluminium, by following weight portion (kilogram) raw material make: fresh sand 250, bentonite 55, lignin 7, Sodium Benzoate 1.5, nanometer scale ceramics powder 10, sodium alginate 5, silester 1.5, titanium dioxide 75, calgon 4, polyvinyl alcohol 2.5, tributyl phosphate 1.5, water are appropriate;
The preparation method of the described molding sand for cast aluminium, it is characterized in that comprising the following steps: fresh sand, bentonite are put into 460 ℃ of calcining furnaces and calcine 3.6 hours, then, take out, be ground into 350 order powder, then add sodium alginate, silester, titanium dioxide, suitable quantity of water, dispersed with stirring, pugging, sends in 1470 ℃ of calcining furnaces and calcines 4.5 hours, taking-up is crushed to 70 orders, obtains calcining material; Lignin, Sodium Benzoate, nanometer scale ceramics powder, tributyl phosphate are mixed, grind 27 minutes, then mix with other residual components, add and be equivalent to the water wet mixing 14 minutes of compound 5% and get final product.
The processing performance of the molding sand that the present invention makes:
Green compression strength: 0.106Mpa, air penetrability: 107%, hot green tensile strength: 456Kpa, shatter index: 87%.
Claims (2)
1. for a molding sand for cast aluminium, it is characterized in that being made by the raw material of following weight portion: fresh sand 240-260, bentonite 50-60, lignin 5-8, Sodium Benzoate 1-2, nanometer scale ceramics powder 9-12, sodium alginate 3-6, silester 1-2, titanium dioxide 70-80, calgon 3-5, polyvinyl alcohol 2-3, tributyl phosphate 1-2, water are appropriate.
2. according to claim 1 for the preparation method of the molding sand of cast aluminium, it is characterized in that comprising the following steps: fresh sand, bentonite are put into 450-480 ℃ of calcining furnace and calcine 3-4 hour, then, take out, be ground into 200-400 order powder, then add sodium alginate, silester, titanium dioxide, suitable quantity of water, dispersed with stirring, pugging, sends in 1460-1480 ℃ of calcining furnace and calcines 4-5 hour, taking-up is crushed to 50-100 order, obtains calcining material; Lignin, Sodium Benzoate, nanometer scale ceramics powder, tributyl phosphate are mixed, grind 20-30 minute, then mix with other residual components, add and be equivalent to water wet mixing 10-15 minute of compound 3-5% and get final product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310481178.8A CN103521692A (en) | 2013-10-16 | 2013-10-16 | Molding sand for casting aluminum and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310481178.8A CN103521692A (en) | 2013-10-16 | 2013-10-16 | Molding sand for casting aluminum and preparation method thereof |
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| CN103521692A true CN103521692A (en) | 2014-01-22 |
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| CN201310481178.8A Pending CN103521692A (en) | 2013-10-16 | 2013-10-16 | Molding sand for casting aluminum and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104084521A (en) * | 2014-06-13 | 2014-10-08 | 吴江市液铸液压件铸造有限公司 | Additive for casting moulding sand and preparation method and application method thereof |
| CN105414461A (en) * | 2015-11-25 | 2016-03-23 | 铜陵市经纬流体科技有限公司 | High-permeability compact composite modified sodium silicate-bonded sand for pump valve castings and preparation method of high-permeability compact composite modified sodium silicate-bonded sand |
| CN105436394A (en) * | 2015-11-25 | 2016-03-30 | 铜陵市经纬流体科技有限公司 | Heat-resisting and high-breathability composite modified water glass sand used for pump valve casting and manufacturing method of heat-resisting and high-breathability composite modified water glass sand |
| CN107282864A (en) * | 2017-08-15 | 2017-10-24 | 合肥正明机械有限公司 | A kind of molding sand of cast nonferrous alloy |
| CN110899608A (en) * | 2020-01-02 | 2020-03-24 | 西安昆仑工业（集团）有限责任公司 | Molding sand for aluminum casting and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104084521A (en) * | 2014-06-13 | 2014-10-08 | 吴江市液铸液压件铸造有限公司 | Additive for casting moulding sand and preparation method and application method thereof |
| CN104084521B (en) * | 2014-06-13 | 2017-01-11 | 吴江市液铸液压件铸造有限公司 | Additive for casting moulding sand and preparation method and application method thereof |
| CN105414461A (en) * | 2015-11-25 | 2016-03-23 | 铜陵市经纬流体科技有限公司 | High-permeability compact composite modified sodium silicate-bonded sand for pump valve castings and preparation method of high-permeability compact composite modified sodium silicate-bonded sand |
| CN105436394A (en) * | 2015-11-25 | 2016-03-30 | 铜陵市经纬流体科技有限公司 | Heat-resisting and high-breathability composite modified water glass sand used for pump valve casting and manufacturing method of heat-resisting and high-breathability composite modified water glass sand |
| CN107282864A (en) * | 2017-08-15 | 2017-10-24 | 合肥正明机械有限公司 | A kind of molding sand of cast nonferrous alloy |
| CN110899608A (en) * | 2020-01-02 | 2020-03-24 | 西安昆仑工业（集团）有限责任公司 | Molding sand for aluminum casting and preparation method thereof |
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Application publication date: 20140122 |