Anti-adhesive saw-dust molding sand and preparation method thereof

Abstract

An anti-adhesive saw-dust molding sand is characterized in that the anti-adhesive saw-dust molding sand is prepared by, by weight, 200-220 parts of quartz sand, 30-35 parts of bentonite, 40-45 parts of Datong soil, 30-35 parts of saw dust, 10-15 parts of rice husk meal, 30-35 parts of fangzi soil, 18-25 parts of Longyan soil, 15-20 parts of corn flour, 5-6 parts of silane coupling agents KH550, 2-3 parts of ammonium dihydrogen phosphate, 3-4 parts of cotton seed oil and the certain amount of water. By using the quartz sand and the bentonite and the like to calcinate, calcinate at high temperature and combine and dispersing and grinding the fangzi soil and the like, the molding sand has excellent smoothness, cohesiveness, toughness and plasticity, and cohesiveness of the molding sand is improved by grinding the saw dust, the rice husk meal and the silane coupling agents KH550. By using the saw dust, the corn flour and the like, high-temperature collapsibility is improved, and the molding sand is pollution-free and low in cost. Besides, the molding sand is anti-adhesive to cast pieces, causes few peeling of the cast pieces and is good in economic benefits.

Description

technical field [0001] The invention relates to the field of casting, in particular to sawing sawdust anti-adhesive 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 s...

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.