Casting molding sand and preparation method thereof

Abstract

The invention discloses casting molding sand and a preparation method thereof. Raw materials in part by weight, i.e. 70-80 parts of pulverized coal ash, 15-20 parts of returned sand, 20-25 parts of quartz sand, 2-4 parts of sepiolite, 5-15 parts of bentonite, 2-4 parts of mullite sand, 3-5 parts of water glass, 5-7 parts of resin and 2-4 parts of steel fiber, are weighed and mixed evenly, and then, the casting molding sand is obtained. The casting molding sand has the advantages that the cost can be reduced, the air permeability is good, and the improvement on the quality of castings is favored.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a casting sand and a preparation method thereof. Background technique [0002] Molding sand is a material used for molding in sand casting. Molding sand is generally made of casting sand, molding sand binder and auxiliary additives and other molding materials mixed in a certain proportion. Natural silica sand containing clay can also be used. Usually, it is used for aluminum casting. In the molding sand formula, the particle size of the molding sand is too large or too small, and 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. The diameter of the molding sand is too small, resulting in poor air permeability of the sand mold. Aluminum castings have good porosity. Molding sand can be divided into clay sand, water glass sand, cement sand, resin sand, etc. according to t...

AI Technical Summary

Problems solved by technology

[0002] Molding sand is a material used for molding in sand casting. Molding sand is generally made of casting sand, molding sand binder and auxiliary additives and other molding materials mixed in a certain proportion. Natural silica sand containing clay can also be used. Usually, it is used for aluminum casting. In the molding sand formula, the particle size of the molding sand is too large or too small, and 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. The diameter of the molding sand is too small, resulting in poor air permeability of the sand mold. Aluminum castings have pores and are easy to produce