Composite foundry sand material for preventing foundry sand sintering in steel cast casting and preparation method thereof

Abstract

The invention relates to a composite foundry sand material for preventing foundry sand sintering in steel cast casting and a preparation method thereof. After the material is casted and calcined at high temperature, the foundry sand of the material is of a scrobiculate loose structure, instead of a hard agglomerated cake, and the composite foundry sand material comprises the following components in percentage by weight: 40-65% of quartz sand, 35-60% of 70 sand and 1-1.2% of furane resin, and a curing agent accounts for 30-50% of furane resin. The composite foundry sand material has the advantages that after being casted and calcined, the composite foundry sand forms the scrobiculate loose structure, thereby damaging a quartz sand foundry sand sintered structure, generating no large agglomerated block, being easy for cleaning, greatly improving labor productivity and reducing production cost; in addition, the production materials (quartz sand and 70 sand) have low cost and wide sources; moreover, by using the composite foundry sand material, cracks, misrun and other secondary flaws caused by cleaning can be reduced, therefore, the quality of casts is improved.

Description

technical field [0001] The invention relates to a composite molding sand material capable of preventing molding sand from sintering in the casting of steel castings and a production method thereof. After the material is poured and calcined at a high temperature, the molding sand forms a honeycomb-like loose structure without forming hard agglomerates, and belongs to the production of cast steel. The casting process method manufacturing field. Background technique [0002] At present, in the production of quartz self-setting sand casting (including furan resin, phenolic resin, sodium silicate organic resin quartz self-setting sand), the solution to the sintering of quartz sand mold sand caused by poor heat dissipation due to structural reasons for large steel castings is usually in Partially use special sand such as chrome ore, zirconium ore, pearl sand and forsterite sand. The special sand has a certain heat storage function and has a higher refractoriness than quartz sand. ...

AI Technical Summary

Problems solved by technology

[0002] At present, in the production of quartz self-setting sand casting (including furan resin, phenolic resin, sodium silicate organic resin quartz self-setting sand), the solution to the sintering of quartz sand mold sand caused by poor heat dissipation due to structural reasons for large steel castings is usually in Partially use special sand such as chrome ore, zirconium ore, pearl sand and forsterite sand. The special sand has a certain heat storage function and has a higher refractoriness than quartz sand. It can prevent local molding sand from overheating too much. The anti-sintering effect of sand, but the slender part with thicker wall thickness or deeper core is still sintered because the high-temperature special sand exceeds the refractoriness, and it is more difficult to clean the sand, and the special sand is not only scarce in resources, but also expensive and labor-intensive. Low productivity and poor production conditions

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