CN104439040A - Molding sand applied to copper alloy castings and preparation method of molding sand - Google Patents
Molding sand applied to copper alloy castings and preparation method of molding sand Download PDFInfo
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- CN104439040A CN104439040A CN201410711347.7A CN201410711347A CN104439040A CN 104439040 A CN104439040 A CN 104439040A CN 201410711347 A CN201410711347 A CN 201410711347A CN 104439040 A CN104439040 A CN 104439040A
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- molding sand
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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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- 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
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses molding sand applied to copper alloy castings. The molding sand is prepared from the following raw materials in parts by weight: 7-10 parts of bentonite, 9-12 parts of nano-scale ceramic powder, 7-9 parts of calcined kaolin, 1-1.5 parts of neopentyl glycol, 2-3 parts of hydroxyethyl acrylate, 1-2 parts of methyl acrylate, 0.5-0.8 part of benzoyl peroxide, 2-3 parts of heavy oil, 0.1-0.2 part of sodium dodecyl benzene sulfonate, 0.4-0.6 part of potassium dichromate, 200-220 parts of clay, a proper amount of water and 20-30 parts of an additive. The clay is added into the molding sand, so that the molding sand is moderate in particle size, good in air permeability, good in mobility and good in dispersibility; meanwhile, the castings are smooth in surface; the molding sand can be recycled and reused, is good in collapsibility, low in sand leakage, suitable for casting copper alloys and high in finished product ratio; the castings are exquisite.
Description
Technical field
The present invention relates to casting field, particularly relate to a kind of copper-alloy casting molding sand and preparation method thereof.
Background technology
The subject matter that current molding sand exists has: 1, particle size difficulty controls, if molding sand particle diameter is too large, although gas permeability is better, cast(ing) surface is more coarse, and fineness is bad; If molding sand material footpath is too little, cause mo ld void bad, foundry goods has pore to produce.2, dispel the heat bad, chill effect is poor, and shrinkage porosite, shrinkage cavity phenomenon easily appear in intricate casting inside.3, dispersed, mobility is bad, easily caking, dusting beans.4, easily foundry goods is stain.5, release property is poor.6, molding sand is targetedly lacked for different types of alloy.
Conventional clay molding sand has many good qualities, but exists not easy to be recycled, and poor air permeability, mobility are bad, dispersiveness is bad, collapsibility is poor, it is bad to dispel the heat, environmental pollution is serious shortcoming.
Therefore, the above shortcoming that molding sand exists needs to overcome.
Summary of the invention
The object of the present invention is to provide a kind of copper-alloy casting molding sand and preparation method thereof, this molding sand particle size is suitable, not only good permeability, good fluidity, good dispersion, and cast(ing) surface is smooth, all right recycling, collapsibility is good, knockout is few, be applicable to the casting of copper alloy, yield rate is high, and foundry goods is exquisite.
Technical scheme of the present invention is as follows:
A kind of copper-alloy casting molding sand, is characterized in that being made up of the raw material of following weight portion: bentonite 7-10, nanometer scale ceramics powder 9-12, calcined kaolin 7-9, neopentyl glycol 1-1.5, hydroxy-ethyl acrylate 2-3, methyl acrylate 1-2, benzoyl peroxide 0.5-0.8, heavy oil 2-3, neopelex 0.1-0.2, potassium bichromate 0.4-0.6, clay 200-220, water are appropriate, auxiliary agent 20-30;
Described auxiliary agent is made up of the raw material of following weight portion: useless porcelain 18-22, cullet 2-3, sodium carbonate 2-3, bentonite 3-4, carboxymethyl cellulose 0.5-1, clay 3-4, calgon 1-1.4, PP wax 1-1.4, dextrin 1-1.4, water are appropriate; Preparation method is: carry out ball milling by after useless porcelain, cullet, sodium carbonate, bentonite mixing, cross 200 mesh sieves, calcine 5-6 hour, be ground into the particle that particle diameter is less than 2mm at 1200-1220 DEG C; Add in 4-5 weight parts water by clay, carboxymethyl cellulose, dextrin, add described particle, stir after stirring, dry, pulverize, particle diameter at 0.05-2mm, then mixes with other residual components, stirs, to obtain final product.
The preparation method of described copper-alloy casting molding sand, is characterized in that comprising the following steps:
(1) by clay, calcined kaolin mixing, pulverize, cross 50 mesh sieves, mix with nanometer scale ceramics powder, the water adding 7-9% weight portion stirs, granulation, and particle diameter is at 0.05-2.5mm, send in calcining furnace, pre-burning 20-25 minute at 300-400 DEG C, then sinters at 1230-1270 DEG C, takes out, polishing, to surface roughness≤0.1mm, obtains clay particle;
(2) get the water of 6.5-7.5 weight portion, add neopentyl glycol, hydroxy-ethyl acrylate, methyl acrylate, neopelex, be heated to 70-80 DEG C, add benzoyl peroxide, stirring reaction 20-30 minute, obtains slurry;
(3) slurry that described clay particle, (2) step obtain is mixed 4-7 minute with other residual components, to obtain final product.
Beneficial effect of the present invention
Molding sand of the present invention is by using clay, and particle size is suitable, not only good permeability, good fluidity, good dispersion, and cast(ing) surface is smooth, all right recycling; Molding sand collapsibility of the present invention is good, and knockout is few, and be applicable to the casting of copper alloy, yield rate is high, and foundry goods is exquisite.Auxiliary agent of the present invention employs useless porcelain, cullet, good heat resistance, and Surface coating has clay, has good compatibility with clay particle, can increase mobility, the dispersiveness of molding sand simultaneously, prevent from boning during clay particle high temperature, be beneficial to recycling.
Detailed description of the invention
A kind of copper-alloy casting molding sand, is made up of the raw material of following weight portion (kilogram): bentonite 8, nanometer scale ceramics powder 10, calcined kaolin 8, neopentyl glycol 1.3, hydroxy-ethyl acrylate 2.5, methyl acrylate 1.4, benzoyl peroxide 0.7, heavy oil 2.5, neopelex 0.1, potassium bichromate 0.5, clay 210, water are appropriate, auxiliary agent 25;
Described auxiliary agent is made up of the raw material of following weight portion (kilogram): useless porcelain 20, cullet 2.5, sodium carbonate 2.5, bentonite 3.5, carboxymethyl cellulose 0.7, clay 3.5, calgon 1.2, PP wax 1.2, dextrin 1.2, water are appropriate; Preparation method is: carry out ball milling by after useless porcelain, cullet, sodium carbonate, bentonite mixing, cross 200 mesh sieves, calcine 5.5 hours, be ground into the particle that particle diameter is less than 2mm at 1210 DEG C; Add in 4.5 weight parts waters by clay, carboxymethyl cellulose, dextrin, add described particle, stir after stirring, dry, pulverize, particle diameter at 0.05-2mm, then mixes with other residual components, stirs, to obtain final product.
The preparation method of described copper-alloy casting molding sand, comprises the following steps:
(1) by clay, calcined kaolin mixing, pulverize, cross 50 mesh sieves, mix with nanometer scale ceramics powder, the water adding 8% weight portion stirs, granulation, and particle diameter is at 0.05-2.5mm, send in calcining furnace, pre-burning 23 minutes at 350 DEG C, then sinters at 1250 DEG C, takes out, polishing, to surface roughness≤0.1mm, obtains clay particle;
(2) get the water of 7 weight portions, add neopentyl glycol, hydroxy-ethyl acrylate, methyl acrylate, neopelex, be heated to 75 DEG C, add benzoyl peroxide, stirring reaction 25 minutes, obtains slurry;
(3) slurry that described clay particle, (2) step obtain is mixed 6 minutes with other residual components, to obtain final product.
The sand test data that the present embodiment obtains are as follows: green compression strength is 92KPa, gas permeability 55, and hot green tensile strength is 2.1KPa, and normal temperature green tensile strength is 25KPa.
Claims (2)
1. a copper-alloy casting molding sand, is characterized in that being made up of the raw material of following weight portion: bentonite 7-10, nanometer scale ceramics powder 9-12, calcined kaolin 7-9, neopentyl glycol 1-1.5, hydroxy-ethyl acrylate 2-3, methyl acrylate 1-2, benzoyl peroxide 0.5-0.8, heavy oil 2-3, neopelex 0.1-0.2, potassium bichromate 0.4-0.6, clay 200-220, water are appropriate, auxiliary agent 20-30;
Described auxiliary agent is made up of the raw material of following weight portion: useless porcelain 18-22, cullet 2-3, sodium carbonate 2-3, bentonite 3-4, carboxymethyl cellulose 0.5-1, clay 3-4, calgon 1-1.4, PP wax 1-1.4, dextrin 1-1.4, water are appropriate; Preparation method is: carry out ball milling by after useless porcelain, cullet, sodium carbonate, bentonite mixing, cross 200 mesh sieves, calcine 5-6 hour, be ground into the particle that particle diameter is less than 2mm at 1200-1220 DEG C; Add in 4-5 weight parts water by clay, carboxymethyl cellulose, dextrin, add described particle, stir after stirring, dry, pulverize, particle diameter at 0.05-2mm, then mixes with other residual components, stirs, to obtain final product.
2. the preparation method of copper-alloy casting molding sand according to claim 1, is characterized in that comprising the following steps:
(1) by clay, calcined kaolin mixing, pulverize, cross 50 mesh sieves, mix with nanometer scale ceramics powder, the water adding 7-9% weight portion stirs, granulation, and particle diameter is at 0.05-2.5mm, send in calcining furnace, pre-burning 20-25 minute at 300-400 DEG C, then sinters at 1230-1270 DEG C, takes out, polishing, to surface roughness≤0.1mm, obtains clay particle;
(2) get the water of 6.5-7.5 weight portion, add neopentyl glycol, hydroxy-ethyl acrylate, methyl acrylate, neopelex, be heated to 70-80 DEG C, add benzoyl peroxide, stirring reaction 20-30 minute, obtains slurry;
(3) slurry that described clay particle, (2) step obtain is mixed 4-7 minute with other residual components, to obtain final product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410711347.7A CN104439040A (en) | 2014-12-01 | 2014-12-01 | Molding sand applied to copper alloy castings and preparation method of molding sand |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410711347.7A CN104439040A (en) | 2014-12-01 | 2014-12-01 | Molding sand applied to copper alloy castings and preparation method of molding sand |
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| CN104439040A true CN104439040A (en) | 2015-03-25 |
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| CN201410711347.7A Pending CN104439040A (en) | 2014-12-01 | 2014-12-01 | Molding sand applied to copper alloy castings and preparation method of molding sand |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104841849A (en) * | 2015-04-25 | 2015-08-19 | 青阳县三联铸业有限责任公司 | Efficient chill casting molding sand and preparation method thereof |
| CN104841847A (en) * | 2015-04-25 | 2015-08-19 | 青阳县三联铸业有限责任公司 | High temperature resistant molding sand with good mold release property and preparation method thereof |
| CN104889318A (en) * | 2015-06-08 | 2015-09-09 | 含山县东山德雨球墨铸造厂 | Preparation method of steel casting moulding sand |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4037646A (en) * | 1975-06-13 | 1977-07-26 | Sumitomo Metal Industries, Ltd. | Molds for continuously casting steel |
| CN101357396A (en) * | 2007-07-30 | 2009-02-04 | 中信重工机械股份有限公司 | Large double-flange copper alloy bearing-bush chilling striking-sand centrifugal casting technique |
| CN101433941A (en) * | 2008-12-04 | 2009-05-20 | 上海市机械制造工艺研究所有限公司 | Green-sand for copper alloy relief decorative panel and preparation technique thereof |
| CN102366812A (en) * | 2011-10-11 | 2012-03-07 | 许立新 | Preparation method for sodium silicate sand used for casting |
| CN102909313A (en) * | 2012-10-16 | 2013-02-06 | 武汉重工铸锻有限责任公司 | Copper-alloy casting core sand and fabrication method thereof |
| CN104057018A (en) * | 2014-05-28 | 2014-09-24 | 安徽鑫润新型材料有限公司 | Casting molding sand and preparation method thereof |
-
2014
- 2014-12-01 CN CN201410711347.7A patent/CN104439040A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4037646A (en) * | 1975-06-13 | 1977-07-26 | Sumitomo Metal Industries, Ltd. | Molds for continuously casting steel |
| CN101357396A (en) * | 2007-07-30 | 2009-02-04 | 中信重工机械股份有限公司 | Large double-flange copper alloy bearing-bush chilling striking-sand centrifugal casting technique |
| CN101433941A (en) * | 2008-12-04 | 2009-05-20 | 上海市机械制造工艺研究所有限公司 | Green-sand for copper alloy relief decorative panel and preparation technique thereof |
| CN102366812A (en) * | 2011-10-11 | 2012-03-07 | 许立新 | Preparation method for sodium silicate sand used for casting |
| CN102909313A (en) * | 2012-10-16 | 2013-02-06 | 武汉重工铸锻有限责任公司 | Copper-alloy casting core sand and fabrication method thereof |
| CN104057018A (en) * | 2014-05-28 | 2014-09-24 | 安徽鑫润新型材料有限公司 | Casting molding sand and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104841849A (en) * | 2015-04-25 | 2015-08-19 | 青阳县三联铸业有限责任公司 | Efficient chill casting molding sand and preparation method thereof |
| CN104841847A (en) * | 2015-04-25 | 2015-08-19 | 青阳县三联铸业有限责任公司 | High temperature resistant molding sand with good mold release property and preparation method thereof |
| CN104889318A (en) * | 2015-06-08 | 2015-09-09 | 含山县东山德雨球墨铸造厂 | Preparation method of steel casting moulding sand |
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Application publication date: 20150325 |
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| RJ01 | Rejection of invention patent application after publication |