CN105436411A - High-permeability evaporative pattern casting method - Google Patents
High-permeability evaporative pattern casting method Download PDFInfo
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- CN105436411A CN105436411A CN201511022632.9A CN201511022632A CN105436411A CN 105436411 A CN105436411 A CN 105436411A CN 201511022632 A CN201511022632 A CN 201511022632A CN 105436411 A CN105436411 A CN 105436411A
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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
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
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Abstract
The invention discloses a high-permeability evaporative pattern casting method which is characterized in that roughing sand, functional components and a binding agent are provided; the roughing sand comprises new sand and reclaimed sand; the new sand comprises, by weight, 100-110 parts of silica sand, 6-10 parts of zircon sand, 10-15 parts of magnesium olivine sand, 5-7 parts of emery, 3-5 parts of fire-resistant clinker and 3-5 parts of carbonaceous foundry sand; the functional components are combustible materials containing carbon fiber; and the binding agent is a mixture of phenolic resin, vegetable oil, tower oil and polyvinyl alcohol. The method is low in production cost, good in heat conductivity, high in refractoriness and good in acidic and alkali resistance; the structural stability is improved; the permeability is improved on the premise of ensuring the strength of moulding sand; the possibility of the air hole defect of a casting is reduced; and a rate of finished products is increased.
Description
Technical field
The invention belongs to casting technology field, especially relate to a kind of high ventilative lost-foam casting method.
Background technology
At casting field, in broad terms, every material being used for manufacturing casting mold (comprising core, coating etc.) is referred to as Modeling Material.The casting mold used in Foundry Production has sand mold, metal mold, ceramic mould, gypsum mould, graphite mould etc., wherein the most generally and in a large number use sand mold, worldwide, the foundry goods that application sand mold is produced accounts for the 60%-80% that various casting mold produces casting output, 21 century calls " Green foundry ", protection of the environment, realize the fundamental state policy that sustainable development is for we, Modeling Material is to the environmental protection of Foundry Works, green, cleanly production plays important effect, in sand casting and lost foam casting are produced, by a large amount of for discharge discarded old sand, if regeneration process and recycling can not be carried out, the destruction of huge pollution must be brought to natural environment, therefore a kind of environmental protection is developed, the Modeling Material of of low pollution is for current present situation, have great significance.
Summary of the invention
Based on above technical problem, the invention discloses a kind of high ventilative lost-foam casting method, adopt environment-friendly materials, protect environment and re-sources.
The technical scheme that the present invention is complete comprises:
A kind of high ventilative lost-foam casting method, comprises the steps:
Bead prefoam, preparation apperance group, adopt polystyrene to obtain white mould, running gate system, the rising head identical with cast shape through foaming, adopt the mode of six to eight mould (namely a set of running gate system joins six to eight foundry goods) to be bonded to apperance group subsequently; Apperance group is coated oven dry, vanning, gradation and is filled molding sand jolt ramming, and strike off case mouth, finally cover polyethylene film, vacuum-assist pouring, outlet are polished; It is characterized in that, described molding sand comprises roughing sand and function ingredients;
Described roughing sand comprises fresh sand and reclaimed sand, and described fresh sand and reclaimed sand mass ratio are (65-80): (35-20);
Described fresh sand comprises silica sand 100-110 part by weight, zircon sand 6-10 part, forsterite sand 10-15 part, emergy 5-7 part, grog refractory 3-5 part, carbon sand 3-5 part;
In described silica sand, dioxide-containing silica is 90%-95%, and aluminium oxide is less than 5%, and surplus is inevitable impurity, and granularity is 140-180 order, and strict density is more than 1.75g/cm3, and average fineness is 52-55;
In described zircon sand, zirconia content is greater than 70%, and silica content is less than 28%, and titanium oxide content is less than 0.3%, and iron oxide content is less than 0.12%, and alumina content is less than 0.2%, and granularity is 240-280 order;
In described olivine sand, content of magnesia is 48-55%, and silica content is less than 45%, and iron oxide content is less than 8%, and granularity is 240-280 order;
In described emergy, alumina content is 99-99.5%, and granularity is 140-180 order;
Bauxite and the gangue mixture of described grog refractory to be mass ratio be 2:1, wherein in bauxite, alumina content is 75%, and refractoriness is greater than 1850 DEG C;
Described carbon sand granularity is 160-200 order;
Described reclaimed sand granularity is 180-240 order;
Described function ingredients diatomite or one to two kind of attapulgite, granularity is 80-120 order, and it accounts for the 3-5% of roughing sand gross mass.
Described carbon sand is graphite or coke, granularity is 180 orders.
Hinge structure of the present invention, adopt the silica sand of appropriate level as roughing sand principal component, reduce production cost, and the zircon sand adopting particle diameter little and olivine sand, the coefficient of expansion is little, improve structural stability, thermal conductivity is good, refractoriness is high, and olivine sand also improves the anti acid alkali performance of molding sand, grog refractory is loose, improve refractoriness, and be convenient to knockout process, adopt reclaimed sand, be beneficial to environmental protection recycling, and fine grain reclaimed sand is conducive to improving mold quality, adopt the porous material such as diatomite or attapulgite as molding sand material simultaneously, reduce the use amount of refractory material, make casting mold lighting, both environmental protection was conducive to, and adopt rational proportioning, gas permeability is added under the prerequisite ensureing sand bond, reduce bleb defect, add yield rate.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention will be further described.
A kind of high ventilative lost-foam casting method, comprises the steps:
Bead prefoam, preparation apperance group, adopt polystyrene to obtain white mould, running gate system, the rising head identical with cast shape through foaming, adopt the mode of six to eight mould (namely a set of running gate system joins six to eight foundry goods) to be bonded to apperance group subsequently; Apperance group is coated oven dry, vanning, gradation and is filled molding sand jolt ramming, and strike off case mouth, finally cover polyethylene film, vacuum-assist pouring, outlet are polished;
Described molding sand is a kind of ventilative foundry sand, comprises roughing sand, the first function ingredients, the second function ingredients, binding agent; Described roughing sand comprises fresh sand and reclaimed sand, and described fresh sand and reclaimed sand mass ratio are (65-80): (35-20);
Described fresh sand comprises silica sand 100-110 part by weight, zircon sand 6-10 part, forsterite sand 10-15 part, emergy 5-7 part, grog refractory 3-5 part, carbon sand 3-5 part;
In described silica sand, dioxide-containing silica is 90%-95%, and aluminium oxide is less than 5%, and surplus is inevitable impurity, and granularity is 140-180 order, and strict density is more than 1.75g/cm3, and average fineness is 52-55;
In zircon sand, zirconia content is greater than 70%, and silica content is less than 28%, and titanium oxide content is less than 0.3%, and iron oxide content is less than 0.12%, and alumina content is less than 0.2%, and granularity is 240-280 order;
In described olivine sand, content of magnesia is 48-55%, and silica content is less than 45%, and iron oxide content is less than 8%, and granularity is 240-280 order,
In described emergy, alumina content is 99-99.5%, and granularity is 140-180 order;
Bauxite and the gangue mixture of described grog refractory to be mass ratio be 2:1, wherein in bauxite, alumina content is 75%, and refractoriness is greater than 1850 DEG C,
Described carbon sand is graphite or coke, granularity is 160-200 order,
Described reclaimed sand granularity is 180-240 order.
The first described function ingredients is the combustible containing carbon fiber, thin wood chip, agricultural crop straw, and thin wood chip granularity is 160-200 order, and crop branch fiber diameter is 4-6mm;
The second described function ingredients diatomite or one to two kind of attapulgite, granularity is 80-120 order, and it accounts for the 3-5% of roughing sand gross mass,
Described binding agent is the mixture of phenolic resins, vegetable oil, tower oil, polyvinyl alcohol, and volume ratio is (60-65): (4-6): (2:-3): (10-15).
Claims (2)
1. a high ventilative lost-foam casting method, comprises the steps:
Bead prefoam, preparation apperance group, adopt polystyrene to obtain white mould, running gate system, the rising head identical with cast shape through foaming, adopt the mode of six to eight mould (namely a set of running gate system joins six to eight foundry goods) to be bonded to apperance group subsequently; Apperance group is coated oven dry, vanning, gradation and is filled molding sand jolt ramming, and strike off case mouth, finally cover polyethylene film, vacuum-assist pouring, outlet are polished; It is characterized in that, described molding sand comprises roughing sand and function ingredients;
Described roughing sand comprises fresh sand and reclaimed sand, and described fresh sand and reclaimed sand mass ratio are (65-80): (35-20);
Described fresh sand comprises silica sand 100-110 part by weight, zircon sand 6-10 part, forsterite sand 10-15 part, emergy 5-7 part, grog refractory 3-5 part, carbon sand 3-5 part;
In described silica sand, dioxide-containing silica is 90%-95%, and aluminium oxide is less than 5%, and surplus is inevitable impurity, and granularity is 140-180 order, and strict density is more than 1.75g/cm3, and average fineness is 52-55;
In described zircon sand, zirconia content is greater than 70%, and silica content is less than 28%, and titanium oxide content is less than 0.3%, and iron oxide content is less than 0.12%, and alumina content is less than 0.2%, and granularity is 240-280 order;
In described olivine sand, content of magnesia is 48-55%, and silica content is less than 45%, and iron oxide content is less than 8%, and granularity is 240-280 order;
In described emergy, alumina content is 99-99.5%, and granularity is 140-180 order;
Bauxite and the gangue mixture of described grog refractory to be mass ratio be 2:1, wherein in bauxite, alumina content is 75%, and refractoriness is greater than 1850 DEG C;
Described carbon sand granularity is 160-200 order;
Described reclaimed sand granularity is 180-240 order;
Described function ingredients is one to two kind of diatomite or attapulgite, and granularity is 80-120 order, and it accounts for the 3-5% of roughing sand gross mass.
2. lost-foam casting method as claimed in claim 2 a kind of high ventilative, is characterized in that, described carbon sand is graphite or coke, granularity is 180 orders.
Priority Applications (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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| Application Number | Priority Date | Filing Date | Title |
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| CN201511022632.9A CN105436411B (en) | 2015-12-30 | 2015-12-30 | A kind of high ventilative lost-foam casting method |
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| CN105436411A true CN105436411A (en) | 2016-03-30 |
| CN105436411B CN105436411B (en) | 2018-08-17 |
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| WO (1) | WO2017114076A1 (en) |
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| 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 |
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| WO2017114080A1 (en) * | 2015-12-30 | 2017-07-06 | 张建勋 | Sand mould casting method for diesel engine shell |
| WO2017114073A1 (en) * | 2015-12-30 | 2017-07-06 | 张建勋 | Sand for breathable casting |
| WO2017114072A1 (en) * | 2015-12-30 | 2017-07-06 | 张建勋 | Moulding sand composition for environmentally friendly casting |
| WO2017114074A1 (en) * | 2015-12-30 | 2017-07-06 | 张建勋 | Moulding sand for fire-resistant casting |
| WO2017114075A1 (en) * | 2015-12-30 | 2017-07-06 | 张建勋 | High strength casting method |
| WO2017114083A1 (en) * | 2015-12-30 | 2017-07-06 | 张建勋 | Cast iron sand mould casting method |
| WO2017114076A1 (en) * | 2015-12-30 | 2017-07-06 | 张建勋 | High breathability lost foam casting method |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017114081A1 (en) * | 2015-12-30 | 2017-07-06 | 张建勋 | Lost foam casting method for diesel engine shell |
| WO2017114077A1 (en) * | 2015-12-30 | 2017-07-06 | 张建勋 | V method casting procedure |
| WO2017114082A1 (en) * | 2015-12-30 | 2017-07-06 | 张建勋 | Sand mould casting method for diesel engine components |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN105436411B (en) | 2018-08-17 |
| WO2017114076A1 (en) | 2017-07-06 |
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