Anti-delamination special coated sand and preparation method thereof

Abstract

The invention provides anti-delamination special coated sand and a preparation method thereof.The special coated sand is prepared from crude sand, phenolic resin, iron oxide, a methenamine aqueous solution and calcium stearate, the crude sand is composed of reclaimed sand and nice foundry sand, the mass of phenolic resin is 2.5%-2.7% of that of the crude sand, the mass of iron oxide is 0.5%-0.7% of that of the crude sand, the mass of the methenamine aqueous solution is 14%-17% of that of phenolic resin, and the mass of calcium stearate is 7%-8% of that of phenolic resin.According to the anti-delamination special coated sand and the preparation method thereof, formula ingredients and proportions of original coated sand are broken, an appropriate amount of nice foundry sand with good liquidity and heat transmitting is added, the addition amount of resin is reduced, an appropriate amount of iron oxide powder is added, the occurrence rate of nitrogen holes is obviously decreased, and the problems that a prepared water jacket core of existing coated sand is prone to delamination and deformation, and the nitrogen holes, flash and burrs of a casting of the water jacket core are prone to be caused are effectively solved.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a special coated sand for anti-layering and a preparation method thereof. Background technique [0002] Coated sand is mainly used in the manufacture of hot core cores, which are used in the casting of mechanical parts. The performance of the coated sand depends on the composition of the coated sand and its preparation method. The existing cores are used for When the engine is cast, the surface of the core is loose and easy to peel off. The qualified rate of the casted engine is low, and it is prone to burrs, even deformation, and produces a large number of nitrogen pores, which seriously affects the quality of the casting. Contents of the invention [0003] In view of the above-mentioned shortcoming of the prior art, the purpose of the present invention is to provide a kind of special coated sand and preparation method thereof that prevents layering, for solving the problem th...

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Problems solved by technology

[0002] Coated sand is mainly used in the manufacture of hot core cores, which are used in the casting of mechanical parts. The performance of the coated sand depends on the composition of the coated sand and its preparation method. The existing cores are used for When the engine is cast, the surface of the core is loose and easy to peel off. The qualified rate of the casted engine is low, and it is prone to burrs, even deformation, and produces a large number of nitrogen pores, which seriously affects the quality of the casting.

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