Low-gas-evolution-amount high-fire-resistance clay molding sand used for casting and preparation method thereof

Abstract

The invention discloses low-gas-evolution-amount high-fire-resistance clay molding sand used for casting and a preparation method thereof. The low-gas-evolution-amount high-fire-resistance clay molding sand is made from, by weight, 26-38 parts of bauxite, 14-18 parts of hornblende, 10-15 parts of coal cinder, 10-15 parts of high-silicon iron tailings, 20-30 parts of fused magnesia, 15-20 parts of papermaking white clay, 18-24 parts of dickite, 12-16 parts of marlstone, 5-10 parts of chalk powder, 6-12 parts of condensed aluminum phosphate, 8-14 parts of light burning powder, 4-9 parts of sodium polystyrene sulfonate and 280-340 parts of improver. Compared with existing molding sand, the molding sand made from the bauxite, the fused magnesia, the papermaking white clay, the coal cinder, the marlstone and other raw materials has the advantages of being low in gas evolution amount, good in gas permeability and heat stability and the like, and the defects that a casting produces air holes, cold shut, and the like can be overcome, so that the quality of the casting is improved.

Description

technical field [0001] The invention relates to low gas generation and high refractory clay molding sand for casting and a preparation method thereof, belonging to the technical field of molding sand. Background technique [0002] Sand casting is the most common casting method, and molding sand is the most important molding material in the current molding process. 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. Castings produced with sand molds account for more than 80% of the total casting production. The quality of molding sand directly affects the appearance quality of castings and casting defects such as sand holes, pores, and sand inclusions. With the continuous development of casting technology, the requirements for the performance of molding sand are getting higher and higher. At present, the foundry sand on the market has the disadvantage of large gas gener...

AI Technical Summary

Problems solved by technology

With the continuous development of casting technology, the performance requirements of molding sand are getting higher and higher. At present, the foundry sand on the market has the disadvantage of large gas generation, which is easy to cause defects such as pores and cold shuts in castings.