Rapid heat dissipation foundry molding sand and preparation method thereof

Abstract

The invention relates to rapid heat dissipation foundry molding sand, which is prepared from the following raw materials by weight: 200-220 parts of clay, 20-30 parts of zirconite powder, 20-30 parts of boiler slag, 15-20 parts of graphite powder, 2-3 parts of epoxy soybean oil, 1-1.5 parts of Tween 80, 4-6 parts of water glass, 5-8 parts of fused millite powder, 3-5 parts of nanometer alpha-alumina, 2-3 parts of yttria, a proper amount of water, and 20-30 parts of an auxiliary agent. According to the rapid heat dissipation foundry molding sand, the molding sand has characteristics of high strength, good gas permeability, art cast product quality improving and recycling; the graphite powder and the nanometer alpha-alumina are used, such that the dispersity and the thermal conductivity of the molding sand are increased, the production efficiency is increased, the high temperature collapsibility is good, the cast surface quality is good, and the labor intensity is reduced; 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, the recycling is easily performed; and the auxiliary agent has good fluidity.

Description

technical field [0001] The invention relates to the field of casting, in particular to a rapid heat dissipation casting sand and a preparation method thereof. Background technique [0002] At present, molding sand is generally formed by mixing molding materials such as raw sand for casting, molding sand binder and auxiliary additives in a certain proportion. If the particle size of the molding sand is too large, although the air permeability is good, the surface of the casting is relatively rough and the finish is not good; if the particle size of the molding sand is too small, the air permeability of the sand mold is not good, and the aluminum casting has pores. Therefore, it is necessary to control the particle size of the molding sand. [0003] Natural clay-containing silica sand can also be used for molding sand. Coal powder clay green sand widely used at home and abroad is generally made of raw sand, binder, coal powder additives, etc. mixed with water, which has a cer...

AI Technical Summary

Problems solved by technology

[0003] Natural clay-containing silica sand can also be used for molding sand. Coal powder clay green sand widely used at home and abroad is generally made of raw sand, binder, coal powder additives, etc. mixed with water, which has a certain anti-sticking sand effect and material The advantages of low cost and high production efficiency, but its consumption is large, the emission is serious, and the combustion and decomposition of pulverized coal in the casting process will produce toxic gas pollution

Traditional clay molding sand is not easy to recycle, and there are still some shortcomings such as easy sand bean, poor collapsibility, poor fluidity, and poor heat resistance, which need to be improved