Mud core moulding sand for casting and preparation method thereof

Abstract

Mud core moulding sand for casting is prepared by the following raw materials including, by weight, 200-240 parts of quartz sand, 30-35 parts of attapulgite, 50-55 parts of perlite, 30-35 parts of sepiolite, 12-17 parts of glass fibers, 30-40 parts of alumina, 2-3 parts of aminopropyltriethoxysilane, 10-12 parts of cellulose gum, 1-2 parts of stearoyl-rac-glycerol, 2-3 parts of epoxidized triglyceride and water in proper amount. By using quartz sand, attapulgite and perlite and through calcining, rich holes are provided, and air permeability is good; by combining with grinding of sepiolite, alumina, cellulose gum and the like, the moulding sand is enabled to have excellent cohesiveness, plasticity and thermal stability; by adding the glass fibers, strength of the moulding sand is enabled to be greatly improved. The mud core moulding sand for casting has the advantages of high dry and wet strength, good air permeability, low gas evolution, quickness in calcining and curing and low mud core scrappage.

Description

technical field [0001] The invention relates to the field of casting, in particular to a casting core sand and a preparation method thereof. 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. Coal powder clay green sand, which is widely used at home and abroad, is generally made of raw sand, binders, coal pow...

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

Coal powder clay green sand, which is widely used at home and abroad, is generally made of raw sand, binders, coal powder additives, etc. and water. It has a certain anti-sticking sand effect, low material cost, and high production efficiency. However, its consumption is large, the emission is serious, and the coal powder is burned and decomposed in the casting process to produce toxic gas pollution.