Foundry modeling facing sand and preparation method thereof

Abstract

The invention relates to foundry modeling facing sand, which is prepared from the following raw materials by weight: 3-4 parts of sodium fluorosilicate, 18-22 parts of metal silicon powder, 10-15 parts of kyanite, 6-8 parts of biotite, 3-5 parts of hydrophobic carbon black, 1-2 parts of coconut acid, 1-2 parts of calcium phosphate, 3-4 parts of methanol, 2-3 parts of castor oil borate, 1-2 parts of sodium stearate, 4-5 parts of iron oxide red, 3-4 parts of organic bentonite, 220-240 parts of clay, a proper amount of water, and 20-30 parts of an auxiliary agent. According to the foundry modeling facing sand of the present invention, the metal silicon powder is used, such that the high temperature resistance of the molding sand is increased, and the collapsibility of the molding sand is good; the sodium fluorosilicate, the sodium stearate, the iron oxide red and the organic bentonite are used, such that the adhesion is good, the demolding property is good, and the shakeout is prevented; the clay is used so as to provide advantages of suitable particle size, good gas permeability, good fluidity and good dispersion, the cast surface is smooth, and the recycling can be achieved; and the molding sand is suitable for facing sand, the cast surface is smooth, and the shakeout is not easily produced.

Description

technical field [0001] The invention relates to the field of casting, in particular to a casting molding surface 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 ha...

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.