CN105436411B - A kind of high ventilative lost-foam casting method - Google Patents

A kind of high ventilative lost-foam casting method Download PDF

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Publication number
CN105436411B
CN105436411B CN201511022632.9A CN201511022632A CN105436411B CN 105436411 B CN105436411 B CN 105436411B CN 201511022632 A CN201511022632 A CN 201511022632A CN 105436411 B CN105436411 B CN 105436411B
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China
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sand
parts
content
mesh
less
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CN201511022632.9A
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Chinese (zh)
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CN105436411A (en
Inventor
陈隽颖
陈衍玲
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青岛立准金属有限公司
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Publication of CN105436411A publication Critical patent/CN105436411A/en
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Publication of CN105436411B publication Critical patent/CN105436411B/en

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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
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/02Sand moulds or like moulds for shaped castings
    • B22C9/04Use of lost patterns

Abstract

The present invention discloses a kind of high ventilative lost-foam casting method, including roughing sand, function ingredients and binder, the roughing sand includes fresh sand and reclaimed sand, and fresh sand includes 100 110 parts of silica sand, 6 10 parts of zircon sand by weight, 10 15 parts of forsterite sand, 57 parts of emergy, 35 parts of grog refractory, 35 parts of carbon sand;The function ingredients are the combustible containing carbon fiber, the binder is the mixture of phenolic resin, vegetable oil, tower oil, polyvinyl alcohol, production cost of the present invention is low, improve structural stability, thermal conductivity is good, and refractoriness height and anti acid alkali performance are good, and gas permeability is increased under the premise of ensureing sand bond, bleb defect is reduced, yield rate is increased.

Description

A kind of high ventilative lost-foam casting method
Technical field
The invention belongs to casting technology fields, more particularly, to a kind of high ventilative lost-foam casting method.
Background technology
In casting field, in broad terms, every material for being used for manufacturing casting mold (including sand core, coating etc.) is referred to as making Proximate matter material.The casting mold used in Foundry Production has sand mold, metal mold, ceramic mould, gypsum mould, graphite mould etc., wherein it is most universal and Sand mold largely is used, worldwide, the casting produced using sand mold accounts for the 60%- that various casting molds produce casting output 80%, 21 century calls " Green foundry ", and environmental protection realizes that sustainable development is our fundamental state policy, Modeling Material pair The environmental protection of Foundry Works, green, cleanly production play an important role, and in sand casting and lost foam casting production, will arrange The discarded old sand of amplification quantity must bring natural environment huge pollution if regeneration treatment and recycling cannot be carried out Destroy, thus develop it is a kind of environmental protection, of low pollution Modeling Material for current present situation, have great significance.
Invention content
Based on the above technical problem, the invention discloses a kind of high ventilative lost-foam casting methods to be protected using environment-friendly materials Environment and resource are protected.
The complete technical solution of the present invention includes:
A kind of high ventilative lost-foam casting method, includes the following steps:
Bead prefoam prepares apperance group, and white mould identical with cast shape is made by foaming using polystyrene, pours Injection system, riser are then bonded to mould by the way of six to eight moulds (i.e. a set of running gate system matches six to eight casting) Sample group;Apperance group coat drying, vanning, by several times filling molding sand jolt ramming, strike off case mouth, finally cover polyethylene film, negative pressure Cast, outlet polishing;It is characterized in that, the molding sand includes roughing sand and function ingredients;
The roughing sand includes fresh sand and reclaimed sand, and the fresh sand and reclaimed sand mass ratio are (65-80):(35-20);
The fresh sand by weight include 100-110 parts of silica sand, 6-10 parts of zircon sand, 10-15 parts of forsterite sand, just Beautiful sand 5-7 parts, 3-5 parts of grog refractory, 3-5 parts of carbon sand;
Dioxide-containing silica is 90%-95% in the silica sand, and aluminium oxide is less than 5%, and surplus is inevitably miscellaneous Matter, granularity are 140-180 mesh, and strict density is 1.75g/cm3 or more, average fineness 52-55;
Zirconia content is more than 70% in the zircon sand, and silica content is less than 28%, and titanium oxide content is less than 0.3%, iron oxide content is less than 0.12%, and alumina content is less than 0.2%, and granularity is 240-280 mesh;
Content of magnesia is 48-55% in the olivine sand, and silica content is less than 45%, and iron oxide content is less than 8%, granularity is 240-280 mesh;
Alumina content is 99-99.5% in the emergy, and granularity is 140-180 mesh;
The grog refractory is that mass ratio is 2:1 bauxite and gangue mixture, wherein aluminium oxide in bauxite Content is 75%, and refractoriness is more than 1850 DEG C;
The carbonaceous fineness of sand is 160-200 mesh;
The regeneration fineness of sand is 180-240 mesh;
One to two kind of the function ingredients diatomite or attapulgite, granularity are 80-120 mesh, account for the total matter of roughing sand The 3-5% of amount.
The carbon sand is graphite or coke, granularity are 180 mesh.
The present invention compared with the prior art, using the silica sand of appropriate level as roughing sand principal component, reduces production cost, and Using grain size small zircon sand and olivine sand, the coefficient of expansion is small, improves structural stability, and thermal conductivity is good, and refractoriness is high, and Olivine sand also improves the anti acid alkali performance of molding sand, and grog refractory is loose, improves refractoriness, and handle convenient for knockout, adopts With reclaimed sand, be conducive to environmental protection and recycle, and fine grain reclaimed sand is conducive to improve mold quality, at the same using diatomite or The porous materials such as attapulgite reduce the usage amount of refractory material as molding sand material, make casting mold lighting, not only improve ring It protects, and using rational proportioning, increases gas permeability under the premise of ensureing sand bond, reduce bleb defect, increase Yield rate is added.
Specific implementation mode
The present invention will be further described With reference to embodiment.
A kind of high ventilative lost-foam casting method, includes the following steps:
Bead prefoam prepares apperance group, and white mould identical with cast shape is made by foaming using polystyrene, pours Injection system, riser are then bonded to mould by the way of six to eight moulds (i.e. a set of running gate system matches six to eight casting) Sample group;Apperance group coat drying, vanning, by several times filling molding sand jolt ramming, strike off case mouth, finally cover polyethylene film, negative pressure Cast, outlet polishing;
The molding sand is a kind of ventilative foundry sand, including roughing sand, the first function ingredients, the second function ingredients, bonding Agent;The roughing sand includes fresh sand and reclaimed sand, and the fresh sand and reclaimed sand mass ratio are (65-80):(35-20);
The fresh sand by weight include 100-110 parts of silica sand, 6-10 parts of zircon sand, 10-15 parts of forsterite sand, just Beautiful sand 5-7 parts, 3-5 parts of grog refractory, 3-5 parts of carbon sand;
Dioxide-containing silica is 90%-95% in the silica sand, and aluminium oxide is less than 5%, and surplus is inevitably miscellaneous Matter, granularity are 140-180 mesh, and strict density is 1.75g/cm3 or more, average fineness 52-55;
Zirconia content is more than 70% in zircon sand, and silica content is less than 28%, and titanium oxide content is less than 0.3%, oxidation Iron content is less than 0.12%, and alumina content is less than 0.2%, and granularity is 240-280 mesh;
Content of magnesia is 48-55% in the olivine sand, and silica content is less than 45%, and iron oxide content is less than 8%, granularity is 240-280 mesh,
Alumina content is 99-99.5% in the emergy, and granularity is 140-180 mesh;
The grog refractory is that mass ratio is 2:1 bauxite and gangue mixture, wherein aluminium oxide in bauxite Content is 75%, and refractoriness is more than 1850 DEG C,
The carbon sand is graphite or coke, granularity are 160-200 mesh,
The regeneration fineness of sand is 180-240 mesh.
First function ingredients are the combustible containing carbon fiber, thin sawdust, agricultural crop straw, thin sawdust granularity For 160-200 mesh, a diameter of 4-6mm of crop branch fiber;
One to two kind of the second function ingredients diatomite or attapulgite, granularity are 80-120 mesh, account for roughing sand The 3-5% of gross mass,
The binder is the mixture of phenolic resin, vegetable oil, tower oil, polyvinyl alcohol, and volume ratio is (60-65): (4-6):(2:-3):(10-15).

Claims (1)

1. a kind of high ventilative lost-foam casting method, includes the following steps:
Bead prefoam prepares apperance group, white mould identical with cast shape is made by foaming using polystyrene, cast is System, riser are then bonded to apperance group in such a way that six to eight moulds, that is, a set of running gate system matches six to eight casting;Mould Sample group coat drying, vanning, by several times filling molding sand jolt ramming, strike off case mouth, finally cover polyethylene film, vacuum-assist pouring goes out Case is polished;It is characterized in that, the molding sand includes roughing sand and function ingredients;
The roughing sand includes fresh sand and reclaimed sand, and the fresh sand and reclaimed sand mass ratio are (65-80):(35-20);
The fresh sand includes 100-110 parts of silica sand, 6-10 parts of zircon sand, 10-15 parts of forsterite sand, emergy by weight 5-7 parts, 3-5 parts of grog refractory, 3-5 parts of carbon sand;
Dioxide-containing silica is 90%-95% in the silica sand, and aluminium oxide is less than 5%, and surplus is inevitable impurity, grain Degree is 140-180 mesh, strict density 1.75g/cm3More than, average fineness 52-55;
Zirconia content is more than 70% in the zircon sand, and silica content is less than 28%, and titanium oxide content is less than 0.3%, oxygen Change iron content and be less than 0.12%, alumina content is less than 0.2%, and granularity is 240-280 mesh;
Content of magnesia is 48-55% in the forsterite sand, and silica content is less than 45%, and iron oxide content is less than 8%, granularity is 240-280 mesh;
Alumina content is 99-99.5% in the emergy, and granularity is 140-180 mesh;
The grog refractory is that mass ratio is 2:1 bauxite and gangue mixture, wherein alumina content in bauxite It is 75%, refractoriness is more than 1850 DEG C;
The carbonaceous fineness of sand is 160-200 mesh;
The regeneration fineness of sand is 180-240 mesh;
The function ingredients are one to two kind of diatomite or attapulgite, and granularity is 80-120 mesh, accounts for roughing sand gross mass 3-5%;
The carbon sand is graphite or coke.
CN201511022632.9A 2015-12-30 2015-12-30 A kind of high ventilative lost-foam casting method CN105436411B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201511022632.9A CN105436411B (en) 2015-12-30 2015-12-30 A kind of high ventilative lost-foam casting method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201511022632.9A CN105436411B (en) 2015-12-30 2015-12-30 A kind of high ventilative lost-foam casting method
PCT/CN2016/107875 WO2017114076A1 (en) 2015-12-30 2016-11-30 High breathability lost foam casting method

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CN105436411B true CN105436411B (en) 2018-08-17

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CN105537516B (en) * 2015-12-30 2018-08-24 泊头市亚奇铸业有限公司 A kind of diesel engine casing sand mould casting method
CN105499497B (en) * 2015-12-30 2018-07-27 繁峙县中兴华徳联铸有限公司 A kind of V methods casting technique
CN105537502A (en) * 2015-12-30 2016-05-04 青岛博泰美联化工技术有限公司 Sand casting method of diesel engine component
CN105397020A (en) * 2015-12-30 2016-03-16 青岛博泰美联化工技术有限公司 Air permeable casting sand
CN105583365A (en) * 2015-12-30 2016-05-18 青岛博泰美联化工技术有限公司 Evaporative pattern casting method for diesel engine casing
CN105458158A (en) * 2015-12-30 2016-04-06 青岛博泰美联化工技术有限公司 Environment-friendly foundry molding sand composition
CN105436411B (en) * 2015-12-30 2018-08-17 青岛立准金属有限公司 A kind of high ventilative lost-foam casting method
CN105583354A (en) * 2015-12-30 2016-05-18 青岛博泰美联化工技术有限公司 Casting method for cast iron sand mold
CN105618667B (en) * 2015-12-30 2018-12-14 韶关市晟发有色金属有限公司 A kind of fire resisting casting sand
CN106077422A (en) * 2016-06-23 2016-11-09 含山县清溪德胜铸造厂 A kind of production technology of the sand foundry goods pig iron
CN107737866A (en) * 2017-10-12 2018-02-27 东风精密铸造安徽有限公司 A kind of novel casting molding sand and preparation method thereof

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WO2017114076A1 (en) 2017-07-06

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