A kind of high-efficiency chilled molding sand and its preparation method

Abstract

The invention discloses high-efficiency chilling casting sand which is prepared from the following raw materials: 270-290 parts by weight of chromite sand, 40-50 parts by weight of alumina, 20-30 parts by weight of brown aluminum oxide, 20-30 parts by weight of mushroom residue, 1-2 parts by weight of aluminum powder, 3-4 parts by weight of carboxymethylcellulose, 30-40 parts by weight of ammonium alum, 2-3 parts by weight of sodium tripolyphosphate, 20-25 parts by weight of bran, 2-3 parts by weight of dodecylbenzene sulfonic acid, 2-3 parts by weight of pine tar, 1-2 parts by weight of colza oil, 12-15 parts by weight of furan resin, 12-15 parts by weight of benzenesulfonic acid, 40-45 parts by weight of wood charcoal and a proper amount of water. The mushroom residue, the bran and the like are used and calcined, thus the air permeability of casting sand is increased, energy resources are saved, and environment is protected; by using the chromite sand, the alumina and the brown aluminum oxide, the expansion factor is low, the casting size is accurate, the plasticity is good, and the high temperature is resisted; by combining with the pine tar, the colza oil and the furan resin, the high-temperature collapsibility is good; by using the aluminum powder, the heat conduction performance is improved, and the effect of a chilling casting is enhanced.

Description

technical field [0001] The invention relates to the field of casting, in particular to a high-efficiency chilled 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. Coal powder clay green sand, which is widely used at home and abroad, is generally made of raw sand...

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.