High-quality molding sand for casting

Abstract

The invention discloses high-quality molding sand for casting, and belongs to the technical field of casting. The sand is composed of ceramsite, polyimide, argil, carclazyte, kieselguhr, titanium dioxide gypsum, furan resin, corn starch, sodium bicarbonate and additives. The produced molding sand has the advantages that the viscidity is moderate, the air permeability is good, the stability is high, the heat conductivity is large, the collapsibility is good and the reutilization rate is high. During test detection, the green compression strength of the molding sand is 0.08-0.12 MPa, the compactability of the molding sand is 40-50%, the air permeability of the molding sand is 105-125, the wet-heat tensile strength of the molding sand is 3-5 KPa and the use value of the molding sand is high.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to high-quality molding sand for casting. Background technique [0002] Molding sand is the material used for molding in casting. It is generally made of molding materials such as casting raw sand, molding sand binder and auxiliary additives in a certain proportion. Coal powder is the most widely used and most common casting anti-sand sticking material for wet mold molding in foundries. It has the advantages of wide source, low cost, good anti-sand sticking performance, and can prevent sand inclusions and subcutaneous pores. However, pulverized coal also has insurmountable shortcomings such as polluting the environment, deteriorating working conditions, and affecting human health. Someone has analyzed the pulverized coal and found that after the pulverized coal is burned, it can produce 6% of sulfur dioxide, 0.3-0.9% of carbon dioxide, 0.2% of carbon monoxide and other ...

AI Technical Summary

Problems solved by technology

However, pulverized coal also has insurmountable shortcomings such as polluting the environment, deteriorating working conditions, and affecting human health.

Someone has analyzed the pulverized coal and found that after the pulverized coal is burned, it can produce 6% of sulfur dioxide, 0.3-0.9% of carbon dioxide, 0.2% of carbon monoxide and other substances. In addition, about 10% of ash can be accumulated in the molding sand, making the The performance of molding sand deteriorates, which affects the service life and recycling rate of molding sand

Molding sand needs to be reused due to cost and other considerations when using it. The amount of repeated addition is generally about 90%, thereby greatly reducing the manufacturing cost. However, its quality will inevitably decline after repeated use. Because of the high scrap rate and poor surface quality of castings, this phenomenon is especially true for molding sand with poor stability of new sand itself.