Anti-shelling and easy-to-fill casting sand

A casting mold and uniform mixing technology, which is applied in the field of foundry sand, can solve problems such as shelling and easy core penetration, and achieve the effect of eliminating shelling, reducing the tendency of shelling, and improving the hardening rate

Active Publication Date: 2018-12-25
安徽江杰实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also deficiencies. Shell core casting sand is prone to shelling defects in the process of making shell core sand cores, and defects such as core

Method used

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  • Anti-shelling and easy-to-fill casting sand

Examples

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Comparison scheme
Effect test

Embodiment 1

[0015] An anti-shelling and easy-filling foundry sand, which is made of the following raw materials in parts by weight: talcum powder 13, fly ash 24, apatite powder 5, zeolite 19, forsterite fine powder 15-3728, dialkyl di Zinc thiophosphate 2, silicon potassium fluoride 5, geopolymer prepolymer 3, organic bentonite 9, sodium tripolyphosphate 3, polyvinyl butyral 4, clay 180, additives 19; said additives Made from the following raw materials in equivalent parts by weight: magnesium hydroxide 5.6, polysilicon solid waste 8.5, carbon black 1.5, cashew nut shell liquid 0.7, phenolic resin 2.3, benzoxazine resin 1.6, syrup 2.3, xanthan gum 1.2, ethanol 1 part, acrylic acid emulsion 0.8; the preparation method of adding additives is as follows: mix magnesium hydroxide, polysilicon solid waste, and carbon black, perform ball milling, pass through a 150-mesh sieve, add ethanol and acrylic acid emulsion, stir evenly, and then add phenolic resin , stir evenly, granulate, the particle s...

Embodiment 2

[0022] An anti-shelling and easy-filling foundry sand, made of the following raw materials in parts by weight: talcum powder 15, fly ash 26, apatite powder 7, zeolite 28, forsterite fine powder 26, dialkyl dithio Zinc phosphate 2.5, silicon potassium fluoride 7, geopolymer prepolymer 4, organic bentonite 13, sodium tripolyphosphate 4, polyvinyl butyral 5, clay 190, additive 18; the additive consists of the following Made from raw materials in equivalent parts by weight: 6.3 parts of magnesium hydroxide, 9.3 parts of polycrystalline silicon solid waste, 2 parts of carbon black, 1 part of cashew nut shell liquid, 3.2 parts of phenolic resin, 1.8 parts of benzoxazine resin, 2 parts of syrup, 1.4 parts of xanthan gum, and 2.3 parts of ethanol , acrylic acid emulsion 1.3; the preparation method of adding additives is: mix magnesium hydroxide, polycrystalline silicon solid waste, carbon black, carry out ball milling, cross 150 mesh sieves, add ethanol and acrylic acid emulsion, stir ...

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Abstract

The invention discloses anti-shelling and easy-to-fill casting sand. The anti-shelling and easy-to-fill casting sand is prepared from the following raw materials: talc powder, fly ash, apatite powder,zeolite, forsterite fine powder, zinc dialkyl dithiophosphate, potassium silicon fluorate, a geopolymer prepolymer, organic bentonite, sodium tripolyphosphate, polyvinyl butyral, clay and an additiveaid. Through improvement on a formula of a system, the curing rate is increased, the hardening rate of the casting sand is increased, and the shelling tendency is reduced; through optimization of thecontent of each component, the overall strength of the casting sand can be improved, the gas generating amount of the casting sand is greatly reduced and a core defect is reduced; the casting sand disclosed by the invention has very strong anti-shelling ability, a good filling property, relatively high high-temperature strength, good rigid permeability and low gas generating amount, and can significantly reduce or eliminate shelling, the core defect and other defects, effectively improve the inner and outer surface qualities of a shell core and improve the production efficiency.

Description

technical field [0001] The invention relates to the technical field of foundry sand, in particular to an anti-shell and easy-fill foundry sand. Background technique [0002] Foundry sand refers to the molding sand or core sand covered with a solid resin film on the surface of the sand grains before molding. There are two kinds of coating processes: cold method and hot method: the cold method dissolves the resin with ethanol, and adds urotropine during the sand mixing process, so that the two are coated on the surface of the sand grains, and the ethanol volatilizes to obtain casting sand; the hot method Preheat the sand to a certain temperature, add resin to make it melt, stir to coat the resin on the surface of the sand, add urotropine aqueous solution and lubricant, cool, crush, and sieve to obtain casting sand. Foundry sand is widely used in steel castings and iron castings due to its advantages of high strength, low gas generation, high dimensional accuracy of produced c...

Claims

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Application Information

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IPC IPC(8): B22C1/00
CPCB22C1/00
Inventor 李中江
Owner 安徽江杰实业有限公司
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