Anti-shakeout foundry molding sand and preparation method thereof

Abstract

The invention relates to anti-shakeout foundry molding sand, which is prepared from the following raw materials by weight: 10-15 parts of yellow loam, 4-6 parts of shell powder, 15-20 parts of vermiculite, 13-17 parts of magnesite fine powder, 1-1.5 parts of zinc dialkyl dithio phosphate, 3-4 parts of sulfurized calcium alkyl phenolate, 2-3 parts of aluminum silicate ceramic fibers, 7-10 parts of organic bentonite, 2-3 parts of disodium phosphate dodecahydrate, 1-2 parts of citric acid monomethyl ester, 200-220 parts of clay, a proper amount of water, and 20-30 parts of an auxiliary agent. According to the anti-shakeout foundry molding sand of the present invention, the clay is used so as to provide advantages of suitable particle size, good gas permeability, good fluidity and good dispersion, and the casting surface is smooth, such that the recycling can be achieved; and the aluminum silicate ceramic fibers are used, such that the strength of the clay particles is increased, and advantages of breaking resistance, good collapsibility and shakeout preventing are provided.

Description

technical field [0001] The invention relates to the field of casting, in particular to an anti-falling sand casting sand and a preparation method thereof. Background technique [0002] The main problems that the molding sand exists at present are: 1, particle size is difficult to control, if the molding sand particle size is too large, although the air permeability is better, the surface of the casting is relatively rough, and the finish is not good; if the molding sand material diameter is too small, the air permeability of the sand mold will be caused No, the casting has porosity. 2. Poor heat dissipation, poor chilling effect, and shrinkage porosity and shrinkage cavities are prone to occur inside complex castings. 3. The dispersibility and fluidity are not good, and it is easy to agglomerate and sand beans. 4. The falling sand is serious and the scrap rate is high. 5. Lack of special molding sand for different types of castings. [0003] Traditional clay molding sand...

AI Technical Summary

Problems solved by technology

[0002] The main problems that the molding sand exists at present are: 1, particle size is difficult to control, if the molding sand particle size is too large, although the air permeability is better, the surface of the casting is relatively rough, and the finish is not good; if the molding sand material diameter is too small, the air permeability of the sand mold will be caused No, the casting has air holes

2. Poor heat dissipation, poor chilling effect, and shrinkage porosity and shrinkage cavities are prone to occur inside complex castings

3. Poor dispersibility and fluidity, easy to agglomerate, sandy beans

4. The falling sand is serious and the scrap rate is high

5. Lack of special molding sand for different types of castings

[0003] Traditional clay molding sand has many advantages, but it has the disadvantages of being difficult to recycle, poor air permeability, poor fluidity, poor dispersibility, poor collapsibility, poor heat dissipation, and serious environmental pollution.