High-quality molding sand

Abstract

The invention discloses high-quality molding sand. The high-quality molding sand is prepared by the following components: clay, modified sodium bentonite, aluminum sulfate, titanium dioxide, coconut shell activated carbon, sodium silicate, tributyl citrate, polyvinyl acetate, lignocellulose, nanometer attapulgite, brown fused alumina powder, modified thermoplastic phenolic resin, diatomaceous earth, starch, carboxymethylcellulose, sodium tripolyphosphate, urotropin and quartz sand. Through a mutual synergistic effect of the components with a specific ratio, the air permeability of the molding sand can be improved, the strength of the molding sand can be improved, the cost is low, the working procedure time is short, a molding sand sintered layer is thin and a sand adhesion phenomenon seldom occurs, the defects of shrinkage porosity and sand holes of castings are greatly reduced, the problems of sand clamping, recesses, scabs and box collapse caused by an expansion defect of the molding sand can be avoided, the pass percent and the yield of the castings are improved, the defective rate is reduced by 59%, a manufacturing process is simple and practicable, and the production pollution can be reduced.

Description

technical field [0001] The invention relates to the field of molding sand production, in particular to high-quality molding sand. Background technique [0002] Molding sand is a material used for molding in casting. Molding sand is generally made by mixing molding materials such as raw sand for casting, molding sand binder and auxiliary additives in a certain proportion. Natural silica sand containing clay can also be used. In the usual molding sand formula for aluminum casting, the particle size of the molding sand is too large or If it is too small, the diameter of the molding sand is too large. Although the air permeability is good, the surface of the aluminum sand parts is rough and the finish is not good. If the diameter of the molding sand is too small, the air permeability of the sand mold is not good, and the aluminum castings have pores. [0003] The role of molding sand in foundry production is extremely important. The casting waste caused by poor quality of moldi...

AI Technical Summary

Problems solved by technology

Molding sand is generally made by mixing molding materials such as raw sand for casting, molding sand binder and auxiliary additives in a certain proportion. Natural silica sand containing clay can also be used. In the usual molding sand formula for aluminum casting, the particle size of the molding sand is too large or If it is too small, the diameter of the sand material is too large. Although the air permeability is good, the surface of the aluminum sand parts is rough and the finish is not good. The diameter of the sand material is too small, resulting in poor air permeability of the sand mold and air holes in the aluminum casting