CN104475661A - High gas-permeability mold core molding sand and preparation method thereof - Google Patents

High gas-permeability mold core molding sand and preparation method thereof Download PDF

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Publication number
CN104475661A
CN104475661A CN201410607536.XA CN201410607536A CN104475661A CN 104475661 A CN104475661 A CN 104475661A CN 201410607536 A CN201410607536 A CN 201410607536A CN 104475661 A CN104475661 A CN 104475661A
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CN
China
Prior art keywords
parts
clay
molding sand
water
weight
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Pending
Application number
CN201410607536.XA
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Chinese (zh)
Inventor
孙修财
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FANCHANG QIXIANG CASTING FACTORY
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FANCHANG QIXIANG CASTING FACTORY
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Priority to CN201410607536.XA priority Critical patent/CN104475661A/en
Publication of CN104475661A publication Critical patent/CN104475661A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C1/00Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C1/00Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/02Compositions 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

Abstract

The invention relates to high gas-permeability mold core molding sand, which is prepared from the following raw materials by weight: 5-8 parts of silicon carbide fibers, 8-10 parts of potassium feldspar, 2-3 parts of carboxymethyl cellulose, 1-2 parts of polyethylene ethyl acetate, 3-4 parts of manganese oxide, 4-5 parts of a polyamide-imide resin, 200-220 parts of clay, 2-3 parts of sodium fluorosilicate, 1-2 parts of sodium disilicate, 10-15 parts of phosphorite powder, a proper amount of water, and 20-30 parts of an auxiliary agent. According to the high gas-permeability mold core molding sand of the present invention, the molding sand is granular and has characteristics of excellent gas permeability, excellent fluidity, excellent dispersion, low moisture absorption, good collapsibility, easy removing, and recycling; the auxiliary agent of the present invention adopts alumina and other high temperature resistance materials, such that the auxiliary agent can not melt during casting, the adhesion of the clay particles can be prevented, and the recycling is easily performed; the clay is wrapped on the surface, and the binding force with the clay particles is strong, such that the molding sand plasticity is increased; the fluidity of the auxiliary agent is good; the carbon fibers are adopted so as to increase the strength and the heat resistance of the molding sand; and the high gas-permeability mold core molding sand of the present invention is suitable for mold core production.

Description

A kind of high vapor-permeable type core sand and preparation method thereof
Technical field
The present invention relates to a kind of casting field, particularly relate to a kind of high vapor-permeable type core sand and preparation method thereof.
Background technology
Current molding sand is generally mixed according to a certain percentage by Modeling Materials such as Foundry sand, moulding sand binder and additional things.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, aluminium casting has pore to produce.Therefore the particle diameter controlling molding sand is needed.
Molding sand also can with natural silica sand argillaceous, domestic and international widely used coal dust clay green-sand, generally formed with the water system of mixing by roughing sand, binding agent, coal dust additive etc., there is certain Sand sticking-resistant effect and the advantage that the cost of material is low, production efficiency is high, but its consumption is large, discharge seriously, at casting process coal dust firing decomposition generation toxic gas is polluted.Conventional clay molding sand is not easy to be recycled, also there is the shortcomings such as easy dusting beans, collapsibility is poor, poor fluidity, heat resistance are bad, needs to improve.
Summary of the invention
The object of the present invention is to provide a kind of high vapor-permeable type core sand and preparation method thereof, this molding sand has excellent gas permeability, mobility, dispersiveness, and hygroscopicity is little, and collapsibility is good, easy-clear, all right recycling, is applicable to make core.
Technical scheme of the present invention is as follows:
A kind of high vapor-permeable type core sand, is characterized in that being made up of the raw material of following weight portion: silicon carbide fibre 5-8, potassic feldspar 8-10, carboxymethyl cellulose 2-3, polyethylene ethyl acetate 1-2, manganese oxide 3-4, polyamide-imide resin 4-5, clay 200-220, prodan 2-3, sodium disilicate 1-2, ground phosphate rock 10-15, water are appropriate, auxiliary agent 20-30;
Described auxiliary agent is made up of the raw material of following weight portion: two oleamide 0.4-0.6, Bi2O3 1-2, B2O3 1-2 of aluminium oxide 13-17, titanium dioxide 3-4, quartz sand 3-5, tall oil 0.5-1, dolomol 1-1.4, ethylene, clay 3-4, silane resin acceptor kh-550 0.8-1.2, water are appropriate; Preparation method is: by aluminium oxide, titanium dioxide, quartz sand, Bi2O3, B2O3 mixing, sends into dry pot and is heated to melt, add Quench in cold water, be ground into the particle of particle diameter≤1.5mm; Add in 4-5 weight parts water by clay, silane resin acceptor kh-550, add described particle after stirring, grinding 20-30 minute, dries, and pulverize, particle diameter at 0.05-2mm, then mixes with other residual components, stirs, to obtain final product.
The preparation method of described high vapor-permeable type core sand, is characterized in that comprising the following steps:
(1) by clay, manganese oxide, potassic feldspar, ground phosphate rock mixing, pulverize, cross 50 mesh sieves, the water adding 7-9% weight portion stirs, granulation, particle diameter, at 0.05-2mm, is sent in calcining furnace, pre-burning 20-25 minute at 300-400 DEG C, then sinter at 900-1000 DEG C, take out, polish to surface roughness≤0.1mm, obtain clay particle;
(2) get the water of 20-30 weight portion, add carboxymethyl cellulose, prodan, sodium disilicate, stir, obtain slurry, clay particle is seethed while spray into described slurry, mix rear placement 2-3 hour, dry, obtain mixed material;
(3) material that (2) step obtains is mixed with other residual components, then the water adding 1-2% weight portion mixes, and to obtain final product.
Beneficial effect of the present invention
Molding sand of the present invention is graininess, and have excellent gas permeability, mobility, dispersiveness, hygroscopicity is little, and collapsibility is good, easy-clear, all right recycling; Auxiliary agent of the present invention employs the exotic materials such as aluminium oxide, can not be melted, clay particle can be prevented to be bonded together when casting, convenient recycling, simultaneously because Surface coating has clay, strong with the adhesion of clay particle, adds the plasticity of molding sand; The good fluidity of this auxiliary agent simultaneously; By using silicon carbide fibre, adding intensity and the heat resistance of molding sand, being applicable to make core.
Detailed description of the invention
A kind of high vapor-permeable type core sand, is made up of the raw material of following weight portion (kilogram): silicon carbide fibre 7, potassic feldspar 9, carboxymethyl cellulose 2.5, polyethylene ethyl acetate 1.5, manganese oxide 3.5, polyamide-imide resin 4.5, clay 210, prodan 2.5, sodium disilicate 1.5, ground phosphate rock 13, water are appropriate, auxiliary agent 25;
Described auxiliary agent is made up of the raw material of following weight portion (kilogram): the two oleamide 0.5 of aluminium oxide 15, titanium dioxide 3.5, quartz sand 4, tall oil 0.7, dolomol 1.2, ethylene, Bi2O3 1.5, B2O3 1.5, clay 3.5, silane resin acceptor kh-550 1, water are appropriate; Preparation method is: by aluminium oxide, titanium dioxide, quartz sand, Bi2O3, B2O3 mixing, sends into dry pot and is heated to melt, add Quench in cold water, be ground into the particle of particle diameter≤1.5mm; Add in 4.5 weight parts waters by clay, silane resin acceptor kh-550, add described particle after stirring, grind 25 minutes, dry, pulverize, particle diameter at 0.05-2mm, then mixes with other residual components, stirs, to obtain final product.
The preparation method of described high vapor-permeable type core sand, comprises the following steps:
(1) by clay, potassic feldspar, ground phosphate rock mixing, pulverize, cross 50 mesh sieves, the water adding 8% weight portion stirs, granulation, particle diameter, at 0.05-2mm, is sent in calcining furnace, pre-burning 23 minutes at 350 DEG C, then sinter at 950 DEG C, take out, polish to surface roughness≤0.1mm, obtain clay particle;
(2) get the water of 25 weight portions, add carboxymethyl cellulose, prodan, sodium disilicate, stir, obtain slurry, clay particle is seethed while spray into described slurry, mix rear placement 2.5 hours, dry, obtain mixed material;
(3) material that (2) step obtains is mixed with other residual components, then the water adding 1.5% weight portion mixes, and to obtain final product.
The sand test data that the present embodiment obtains are as follows: green compression strength is 168KPa, gas permeability 148, and hot green tensile strength is 4.6KPa, and normal temperature green tensile strength is 28KPa.

Claims (2)

1. a high vapor-permeable type core sand, is characterized in that being made up of the raw material of following weight portion: silicon carbide fibre 5-8, potassic feldspar 8-10, carboxymethyl cellulose 2-3, polyethylene ethyl acetate 1-2, manganese oxide 3-4, polyamide-imide resin 4-5, clay 200-220, prodan 2-3, sodium disilicate 1-2, ground phosphate rock 10-15, water are appropriate, auxiliary agent 20-30;
Described auxiliary agent is made up of the raw material of following weight portion: two oleamide 0.4-0.6, Bi2O3 1-2, B2O3 1-2 of aluminium oxide 13-17, titanium dioxide 3-4, quartz sand 3-5, tall oil 0.5-1, dolomol 1-1.4, ethylene, clay 3-4, silane resin acceptor kh-550 0.8-1.2, water are appropriate; Preparation method is: by aluminium oxide, titanium dioxide, quartz sand, Bi2O3, B2O3 mixing, sends into dry pot and is heated to melt, add Quench in cold water, be ground into the particle of particle diameter≤1.5mm; Add in 4-5 weight parts water by clay, silane resin acceptor kh-550, add described particle after stirring, grinding 20-30 minute, dries, and pulverize, particle diameter at 0.05-2mm, then mixes with other residual components, stirs, to obtain final product.
2. the preparation method of high vapor-permeable type core sand according to claim 1, is characterized in that comprising the following steps:
(1) by clay, manganese oxide, potassic feldspar, ground phosphate rock mixing, pulverize, cross 50 mesh sieves, the water adding 7-9% weight portion stirs, granulation, particle diameter, at 0.05-2mm, is sent in calcining furnace, pre-burning 20-25 minute at 300-400 DEG C, then sinter at 900-1000 DEG C, take out, polish to surface roughness≤0.1mm, obtain clay particle;
(2) get the water of 20-30 weight portion, add carboxymethyl cellulose, prodan, sodium disilicate, stir, obtain slurry, clay particle is seethed while spray into described slurry, mix rear placement 2-3 hour, dry, obtain mixed material;
(3) material that (2) step obtains is mixed with other residual components, then the water adding 1-2% weight portion mixes, and to obtain final product.
CN201410607536.XA 2014-11-03 2014-11-03 High gas-permeability mold core molding sand and preparation method thereof Pending CN104475661A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410607536.XA CN104475661A (en) 2014-11-03 2014-11-03 High gas-permeability mold core molding sand and preparation method thereof

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Application Number Priority Date Filing Date Title
CN201410607536.XA CN104475661A (en) 2014-11-03 2014-11-03 High gas-permeability mold core molding sand and preparation method thereof

Publications (1)

Publication Number Publication Date
CN104475661A true CN104475661A (en) 2015-04-01

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2063893A (en) * 1978-12-20 1981-06-10 Kuraray Co Production of moulds
CN101733361A (en) * 2010-01-06 2010-06-16 东华大学 Sand burning preventing coal dust free green sand for casting and preparation method thereof
CN101934344A (en) * 2010-09-02 2011-01-05 吴江市液铸液压件铸造有限公司 Moulding sand for vertically divided box-free shoot-squeeze moulding line
CN102728782A (en) * 2012-06-08 2012-10-17 繁昌县琦祥铸造厂 Molding sand using clay as binder and producing method thereof
CN103272993A (en) * 2013-04-16 2013-09-04 繁昌县恒鑫汽车零部件有限公司 Molding sand manufactured from quartz sand as main material and manufacturing method thereof
CN103551490A (en) * 2013-10-28 2014-02-05 黄俞丰 Foundry sand with good gas permeability
CN103567369A (en) * 2013-10-11 2014-02-12 铜陵市经纬流体科技有限公司 Clay molding sand for cast steel and preparation method thereof

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2063893A (en) * 1978-12-20 1981-06-10 Kuraray Co Production of moulds
CN101733361A (en) * 2010-01-06 2010-06-16 东华大学 Sand burning preventing coal dust free green sand for casting and preparation method thereof
CN101934344A (en) * 2010-09-02 2011-01-05 吴江市液铸液压件铸造有限公司 Moulding sand for vertically divided box-free shoot-squeeze moulding line
CN102728782A (en) * 2012-06-08 2012-10-17 繁昌县琦祥铸造厂 Molding sand using clay as binder and producing method thereof
CN103272993A (en) * 2013-04-16 2013-09-04 繁昌县恒鑫汽车零部件有限公司 Molding sand manufactured from quartz sand as main material and manufacturing method thereof
CN103567369A (en) * 2013-10-11 2014-02-12 铜陵市经纬流体科技有限公司 Clay molding sand for cast steel and preparation method thereof
CN103551490A (en) * 2013-10-28 2014-02-05 黄俞丰 Foundry sand with good gas permeability

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