Carbon steel cast molding sand and preparation method thereof

Abstract

The invention relates to carbon steel cast molding sand, which is prepared from the following raw materials by weight: 20-30 parts of quartz sand, 16-19 parts of bentonite, 2-3 parts of aluminum sulfate, 1-2 parts of barium silicate, 20-25 parts of mullite crystal whisker, 10-14 parts of Sialon powder, 5-8 parts of alpha-Al2O3 micro-powder, 5-7 parts of aloe powder, 200-220 parts of clay, a proper amount of water, and 20-30 parts of an auxiliary agent. According to the carbon steel cast molding sand, the clay is used so as to provide advantages of appropriate particle size, good gas permeability, good fluidity and good dispersion, and the cast surface is smooth so as to recycle; the quartz sand, the Sialon powder, the alpha-Al2O3 micro-powder, and the mullite crystal whisker are adopted so as to increase the heat resistance of the molding sand, prevent the clay particles from adhesion, and provide advantages of high strength and good collapsibility; the aloe powder is used, such that the molding sand plasticity is good, no residue is retained after the high temperature casting, and the collapsibility is good; and the molding sand has characteristics of shakeout resistance and good gas permeability, and is suitable for carbon steel casts.

Description

technical field [0001] The invention relates to the field of casting, in particular to a molding sand for carbon steel castings 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 moldi...

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.