Sand-inclusion-preventing molding sand and preparation method thereof

Abstract

The invention discloses sand-inclusion-preventing molding sand and a preparation method thereof. The molding sand is prepared from raw materials in parts by weight as follows: 33-39 parts of sea sand, 16-22 parts of yellow mud powder, 15-20 parts of fly ash, 12-16 parts of flint clay, 28-34 parts of bentonite, 10-15 parts of blast-furnace water-quenched slag, 14-18 parts of leucite, 10-15 parts of chlorite, 6-12 parts of lithium silicate, 4-8 parts of heavy calcium carbonate powder, 5-10 parts of aluminum dihydrogen tripolyphosphate and 250-300 parts of a modifier. The added raw materials such as the yellow mud powder, the fly ash, the blast-furnace water-quenched slag, the heavy calcium carbonate powder and the like can significantly reduce the thermal stress of the molding sand, improve the thermal wet compressing strength of the molding sand and effectively prevent sand inclusion of castings. The molding sand further has the advantages of good collapsibility, good gas permeability, good liquidity, good thermal stability and the like, the surface quality of the castings is good, and the economic benefit is significant.

Description

technical field [0001] The invention relates to an anti-sand inclusion molding sand 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. The molding sand currently on the market is easy to cause sand inclusions in castings, which seriously affects the ...

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. The molding sand currently on the market is easy to cause sand inclusions in castings, which seriously affects the surface quality of castings.