High-quality molding sand and preparation method thereof

Abstract

The invention discloses high-quality molding sand and a preparation method thereof. The molding sand is prepared from, by weight, 180-200 parts of fused ceramite, 20-30 parts of forsterite, 5-10 parts of black corundum, 40-50 parts of bentonite, 8-10 parts of heavy calcium carbonate powder, 1-2 parts of pulverized coal, 2-4 parts of tung oil, 3-4 parts of phosphate, 2-3 parts of sodium hexametaphosphate and 4-6 parts of hydroxypropyl methyl cellulose. The molding sand has good breathability, strength and heat resistance. The plasticity and deformability are also good. The surfaces of manufactured castings are smooth and bright, the phenomena of shrinkage cavities, bubbles and deformation are reduced, and the rate of finished products is high. Besides, the manufacturing technology is simple, and production pollution can be lowered.

Description

technical field [0001] The invention belongs to the field of casting, in particular to a high-quality molding 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. [0003] The role of molding sand in foundry production is extremely important. The casting waste caused by po...

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