Moulding sand with high wet-compressive strength and preparation method thereof

Abstract

The invention discloses moulding sand with high wet-compressive strength and a preparation method thereof. The moulding sand is prepared from the following raw materials: 32-36 parts of used sand, 12-18 parts of clay ceramsite sand, 8-15 parts of lime soil, 6-10 parts of modified peat soil, 3-5 parts of dickite, 8-12 parts of olivine sand, 2-4 parts of serpentine, 1-2 parts of sodium alginate, 1-2 parts of spray carbon black, 3-6 parts of broken glass, 1-2 parts of silica micropowder, 1-2 parts of sodium fluosilicate and 1-2 parts of electric stove ash. Compared with the prior art, the moulding sand and the preparation method thereof have the advantages as follows: a dry product has high expansibility after being treated, and the treated dry product can form a film to warp sand after being affected with damp in the sand so as to achieve high strength; various materials are treated separately to improve the demoulding property of the moulding sand and reduce the sensibility of the moulding sand to water during pouring, so that the precision of a casting is improved; and the moulding sand can be used for castings with high requirements on wet-compressive strength, and is stable in property and high in yield of castings.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to molding sand with high wet compressive strength and a preparation method thereof. Background technique [0002] Molding sand is a material used for molding in sand casting. The performance of molding sand plays an extremely important role in casting production, usually including high strength and thermal stability, good fluidity, certain plasticity, good air permeability and high collapse. For the molding sand of different uses, there are large or small differences in the performance of the molding sand. In order to be used for the casting of multiple materials or castings at the same time, the existing molding sand usually strengthens multiple properties at the same time, which not only increases the cost. However, the casting effect is not good. In the process of casting gray cast iron cylinder blocks, cylinder heads and other castings, the compaction rate of the mo...

AI Technical Summary

Problems solved by technology

[0002] Molding sand is a material used for molding in sand casting. The performance of molding sand plays an extremely important role in casting production, usually including high strength and thermal stability, good fluidity, certain plasticity, good air permeability and high collapse. For the molding sand of different uses, there are large or small differences in the performance of the molding sand. In order to be used for the casting of multiple materials or castings at the same time, the existing molding sand usually strengthens multiple properties at the same time, which not only increases the cost. However, the casting effect is not good. In the process of casting gray cast iron cylinder blocks, cylinder heads and other castings, the compaction rate of the molding sand is generally required, but there are high requirements for air permeability and wet pressure strength.