CN110899608A - Molding sand for aluminum casting and preparation method thereof - Google Patents
Molding sand for aluminum casting and preparation method thereof Download PDFInfo
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- CN110899608A CN110899608A CN202010002900.5A CN202010002900A CN110899608A CN 110899608 A CN110899608 A CN 110899608A CN 202010002900 A CN202010002900 A CN 202010002900A CN 110899608 A CN110899608 A CN 110899608A
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- silicon carbide
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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
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Abstract
The invention discloses molding sand for aluminum casting, which comprises the following raw materials in parts by weight: 240 portions of fresh sand, 50 to 60 portions of bentonite, 40 to 50 portions of talcum powder, 30 to 40 portions of silicon carbide, 30 to 40 portions of green silicon carbide, 5 to 10 portions of modified graphite, 4 to 7 portions of sodium alginate, 1 to 3 portions of ethyl silicate, 3 to 5 portions of sodium hexametaphosphate and a proper amount of absolute ethyl alcohol. The invention has excellent heat conduction and heat dissipation performance through the combination of the silicon carbide and the green silicon carbide, ensures that the molding sand is smooth under the action of each material, has excellent air permeability, cohesiveness, toughness and plasticity, can resist oxidation at high temperature, has high hardness, better heat conductivity and stronger wear resistance, has simple and easy operation of the preparation method, is environment-friendly, is suitable for industrialization, can be widely applied to the casting of aluminum products, and ensures the quality of aluminum product workpieces.
Description
Technical Field
The invention relates to the technical field of casting, in particular to molding sand for aluminum casting and a preparation method thereof.
Background
The die-casting alloy is widely applied to the prior art. The die-casting aluminum alloy has good use performance and process performance, so the die-casting of the aluminum alloy is developed rapidly, is widely applied in various industrial departments, has the use amount far higher than that of other non-ferrous alloys, and plays an extremely important role in die-casting production;
molding sand is a material used for molding in casting. The molding sand is generally prepared by mixing molding materials such as raw sand for casting, a molding sand binder, additives and the like according to a certain proportion, and natural silica sand containing clay can also be used. The function of the molding sand in the casting production is very important, casting waste products caused by poor quality of the molding sand account for about 30-50% of total casting waste products, so the molding sand has high strength and thermal stability so as to bear the functions of various external forces and high temperature; good fluidity, namely the capability of sand grains to move mutually under the action of external force or self gravity; a certain plasticity, namely the ability of the molding sand to deform under the action of external force and maintain the given shape after the external force is removed; better air permeability, namely the capability of the pores of the molding sand to permeate air.
Disclosure of Invention
The present invention has been made in an effort to solve the above-mentioned problems occurring in the prior art, and an object of the present invention is to provide a molding sand for aluminum casting and a method for preparing the same.
In order to achieve the purpose, the invention provides the following technical scheme: the molding sand for aluminum casting comprises the following raw materials in parts by weight: 240 portions of fresh sand, 50 to 60 portions of bentonite, 40 to 50 portions of talcum powder, 30 to 40 portions of silicon carbide, 30 to 40 portions of green silicon carbide, 5 to 10 portions of modified graphite, 4 to 7 portions of sodium alginate, 1 to 3 portions of ethyl silicate, 3 to 5 portions of sodium hexametaphosphate and a proper amount of absolute ethyl alcohol.
Preferably, the silicon carbide is prepared by putting quartz sand, coke, free silicon dioxide, ceramic powder, titanium dioxide and ceramic binder into an electric furnace, continuously heating to a temperature of not less than 1900 ℃ at a temperature of 100 ℃ per minute for 30-45min, and performing a chemical process to obtain silicon carbide micro powder.
Preferably, the green silicon carbide is prepared by placing quartz sand, coke, free silicon dioxide, ceramic powder, titanium dioxide, resin binder and salt into an electric furnace, heating to 100 ℃ per minute, continuously heating to a temperature of not lower than 1900 ℃, keeping the temperature for 30-45min, and performing a chemical process flow to obtain silicon carbide micropowder.
Preferably, the inorganic binder is a ceramic binder or a metal binder.
Preferably, the organic binder is a resin binder or a rubber binder.
A preparation method of molding sand for aluminum casting comprises the following steps;
putting the fresh sand, the bentonite, the talcum powder, the silicon carbide, the green silicon carbide and the modified graphite into ultrasonic equipment according to the parts by weight and absolute ethyl alcohol as a medium for mixing;
step two, putting the mixed raw materials into a calcining device, heating to 1400-1500 ℃, and calcining for 3-4 h;
step three, putting the hot mixed material into a mould for cooling, pressurizing and solidifying;
step four, mixing the immobilized material with sodium alginate, ethyl silicate and sodium metaphosphate, crushing by using a crusher, and grinding the crushed material by using a grinder;
and step five, wet mixing the ground materials for 2-3 hours by using a ball mill.
Preferably, in the first step, the temperature in the ultrasonic equipment is controlled between 70 and 100 ℃.
Preferably, in the second step, argon is filled into the calcining equipment for 5-6min before calcining, and the calcining equipment is vacuumized to 0.03-0.05 MPa.
The invention provides molding sand for aluminum casting and a preparation method thereof, and the molding sand has the beneficial effects that: the invention has excellent heat conduction and heat dissipation performance through the combination of the silicon carbide and the green silicon carbide, ensures that the molding sand is smooth under the action of each material, has excellent air permeability, cohesiveness, toughness and plasticity, can resist oxidation at high temperature, has high hardness, better heat conductivity and stronger wear resistance, has simple and easy operation of the preparation method, is environment-friendly, is suitable for industrialization, can be widely applied to the casting of aluminum products, and ensures the quality of aluminum product workpieces.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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.
Example 1:
the invention provides a technical scheme that: the molding sand for aluminum casting comprises the following raw materials in parts by weight: 245 parts of fresh sand, 55 parts of bentonite, 45 parts of talcum powder, 35 parts of silicon carbide, 33 parts of green silicon carbide, 8 parts of modified graphite, 3 parts of sodium alginate, 2 parts of ethyl silicate, 4 parts of sodium hexametaphosphate and a proper amount of absolute ethyl alcohol, wherein the silicon carbide is put into an electric furnace by quartz sand, coke, free silica, ceramic powder, titanium dioxide and ceramic bonding agent, is continuously heated to be not lower than 1900 ℃ at a temperature of 100 ℃ per minute for heat preservation for 35min, and is subjected to a chemical process flow to obtain silicon carbide micro powder, the green silicon carbide is put into the electric furnace by the quartz sand, the coke, the free silica, the ceramic powder, the titanium dioxide, the resin bonding agent and salt, is continuously heated to be not lower than 1900 ℃ at a temperature of 100 ℃ per minute for heat preservation for 35min, and is subjected to a chemical process;
also disclosed is a method for preparing the molding sand for aluminum casting, comprising the steps of;
putting the fresh sand, the bentonite, the talcum powder, the silicon carbide, the green silicon carbide and the modified graphite into ultrasonic equipment according to the parts by weight and absolute ethyl alcohol as a medium to be mixed, wherein the temperature in the ultrasonic equipment is controlled to be 85 ℃;
putting the mixed raw materials into a calcining device, filling argon into the calcining device for 5min, vacuumizing the calcining device to 0.03MPa, and heating to 1450 ℃ for calcining for 3 h;
step three, putting the hot mixed material into a mould for cooling, pressurizing and solidifying;
step four, mixing the immobilized material with sodium alginate, ethyl silicate and sodium metaphosphate, crushing by using a crusher, and grinding the crushed material by using a grinder;
and step five, wet mixing the ground materials for 2.5 hours by using a ball mill.
Example 2:
the invention provides a technical scheme that: the molding sand for aluminum casting comprises the following raw materials in parts by weight: 260 parts of fresh sand, 50 parts of bentonite, 47 parts of talcum powder, 36 parts of silicon carbide, 35 parts of green silicon carbide, 7 parts of modified graphite, 6 parts of sodium alginate, 3 parts of ethyl silicate, 5 parts of sodium hexametaphosphate and a proper amount of absolute ethyl alcohol, wherein the silicon carbide is put into an electric furnace by quartz sand, coke, free silica, ceramic powder, titanium dioxide and a ceramic bonding agent, is continuously heated to be not lower than 1900 ℃ at a temperature of 100 ℃ per minute for 45min, and is subjected to a chemical process flow to obtain silicon carbide micro powder, the green silicon carbide is put into the electric furnace by the quartz sand, the coke, the free silica, the ceramic powder, the titanium dioxide, a resin bonding agent and salt, is continuously heated to be not lower than 1900 ℃ at a temperature of 100 ℃ per minute for 45min, and is subjected to a chemical process flow to obtain the silicon;
also disclosed is a method for preparing the molding sand for aluminum casting, comprising the steps of;
putting the fresh sand, the bentonite, the talcum powder, the silicon carbide, the green silicon carbide and the modified graphite into ultrasonic equipment according to the parts by weight and absolute ethyl alcohol as a medium to be mixed, wherein the temperature in the ultrasonic equipment is controlled to be 88 ℃;
putting the mixed raw materials into a calcining device, filling argon into the calcining device for 6min, vacuumizing the calcining device to 0.05MPa, and heating to 500 ℃ for calcining for 3 h;
step three, putting the hot mixed material into a mould for cooling, pressurizing and solidifying;
step four, mixing the immobilized material with sodium alginate, ethyl silicate and sodium metaphosphate, crushing by using a crusher, and grinding the crushed material by using a grinder;
and step five, wet mixing the ground materials for 3 hours by using a ball mill.
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 (6)
1. The molding sand for aluminum casting is characterized by comprising the following raw materials in parts by weight: 240 portions of fresh sand, 50 to 60 portions of bentonite, 40 to 50 portions of talcum powder, 30 to 40 portions of silicon carbide, 30 to 40 portions of green silicon carbide, 5 to 10 portions of modified graphite, 4 to 7 portions of sodium alginate, 1 to 3 portions of ethyl silicate, 3 to 5 portions of sodium hexametaphosphate and a proper amount of absolute ethyl alcohol.
2. The molding sand for aluminum casting according to claim 1, wherein: the silicon carbide is prepared by putting quartz sand, coke, free silicon dioxide, ceramic powder, titanium dioxide and ceramic binder into an electric furnace, continuously heating to a temperature of not less than 1900 ℃ at a temperature of 100 ℃ per minute for 30-45min, and performing a chemical process flow to obtain silicon carbide micro powder.
3. The molding sand for aluminum casting according to claim 1, wherein: the green silicon carbide is prepared by putting quartz sand, coke, free silicon dioxide, ceramic powder, titanium dioxide, resin binder and salt into an electric furnace, continuously heating to a temperature of not less than 1900 ℃ at a temperature of 100 ℃ per minute for 30-45min, and performing chemical process flow to obtain silicon carbide micro powder.
4. The method for producing molding sand for aluminum casting according to any one of claims 1 to 3, characterized in that: comprises the following steps;
putting the fresh sand, the bentonite, the talcum powder, the silicon carbide, the green silicon carbide and the modified graphite into ultrasonic equipment according to the parts by weight and absolute ethyl alcohol as a medium for mixing;
step two, putting the mixed raw materials into a calcining device, heating to 1400-1500 ℃, and calcining for 3-4 h;
step three, putting the hot mixed material into a mould for cooling, pressurizing and solidifying;
step four, mixing the immobilized material with sodium alginate, ethyl silicate and sodium metaphosphate, crushing by using a crusher, and grinding the crushed material by using a grinder;
and step five, wet mixing the ground materials for 2-3 hours by using a ball mill.
5. The method of producing molding sand for aluminum casting according to claim 4, wherein: in the first step, the temperature in the ultrasonic equipment is controlled between 70 and 100 ℃.
6. The method of producing molding sand for aluminum casting according to claim 4, wherein: and in the second step, filling argon into the calcining equipment for 5-6min before calcining, and vacuumizing the calcining equipment to 0.03-0.05 MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010002900.5A CN110899608A (en) | 2020-01-02 | 2020-01-02 | Molding sand for aluminum casting and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010002900.5A CN110899608A (en) | 2020-01-02 | 2020-01-02 | Molding sand for aluminum casting and preparation method thereof |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB240808A (en) * | 1924-10-02 | 1926-07-29 | Aladar Pacz | Mould composition |
| CN103521692A (en) * | 2013-10-16 | 2014-01-22 | 合肥市田源精铸有限公司 | Molding sand for casting aluminum and preparation method thereof |
| CN103521695A (en) * | 2013-10-16 | 2014-01-22 | 合肥市田源精铸有限公司 | Molding sand for casting iron balls and preparation method of molding sand |
| CN104384436A (en) * | 2014-11-07 | 2015-03-04 | 宁国市皖南健身材料有限公司 | Molding sand for vacuum sealing and molding metals |
| CN104646601A (en) * | 2015-01-22 | 2015-05-27 | 安徽省繁昌县皖南阀门铸造有限公司 | Molding sand for large mold core and preparation method thereof |
| CN108465772A (en) * | 2018-06-22 | 2018-08-31 | 佛山市高明利钢精密铸造有限公司 | A kind of preparation method of the special molding sand of large-size stainless steel product monoblock cast |
| CN108543907A (en) * | 2018-07-17 | 2018-09-18 | 合肥欧仕嘉机电设备有限公司 | A kind of high performance sand conditioning method |
| CN108772532A (en) * | 2018-06-19 | 2018-11-09 | 马鞍山市益丰实业集团有限公司 | A kind of box moulding sand formula and preparation process |
| CN109609087A (en) * | 2018-12-29 | 2019-04-12 | 江苏华东砂轮有限公司 | A kind of high heat dissipation abrasive material and preparation method thereof |
-
2020
- 2020-01-02 CN CN202010002900.5A patent/CN110899608A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB240808A (en) * | 1924-10-02 | 1926-07-29 | Aladar Pacz | Mould composition |
| CN103521692A (en) * | 2013-10-16 | 2014-01-22 | 合肥市田源精铸有限公司 | Molding sand for casting aluminum and preparation method thereof |
| CN103521695A (en) * | 2013-10-16 | 2014-01-22 | 合肥市田源精铸有限公司 | Molding sand for casting iron balls and preparation method of molding sand |
| CN104384436A (en) * | 2014-11-07 | 2015-03-04 | 宁国市皖南健身材料有限公司 | Molding sand for vacuum sealing and molding metals |
| CN104646601A (en) * | 2015-01-22 | 2015-05-27 | 安徽省繁昌县皖南阀门铸造有限公司 | Molding sand for large mold core and preparation method thereof |
| CN108772532A (en) * | 2018-06-19 | 2018-11-09 | 马鞍山市益丰实业集团有限公司 | A kind of box moulding sand formula and preparation process |
| CN108465772A (en) * | 2018-06-22 | 2018-08-31 | 佛山市高明利钢精密铸造有限公司 | A kind of preparation method of the special molding sand of large-size stainless steel product monoblock cast |
| CN108543907A (en) * | 2018-07-17 | 2018-09-18 | 合肥欧仕嘉机电设备有限公司 | A kind of high performance sand conditioning method |
| CN109609087A (en) * | 2018-12-29 | 2019-04-12 | 江苏华东砂轮有限公司 | A kind of high heat dissipation abrasive material and preparation method thereof |
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Application publication date: 20200324 |