Mould sand for casting and method of use thereof

Abstract

The present invention relates to molding sand for casting and a method for utilizing the same. The molding sand is prepared as follows: according to weight percentage, 3 to 7 percent of pot clay and 93 to 97 percent of yellow sand are evenly mixed, and cast by molten iron; after the molten iron is cooled down and solidified into an iron slab, the iron slab is taken out, and the sand is evenly mixed to obtain the environment-friendly molding sand. In the process of using the environment-friendly molding sand for casting, after each casting, the used molding sand is added with 20 to 30 percent of new yellow sand; after being evenly mixed, the obtained molding sand can be used for next casting. The molding sand does not contain coal dust, so that the moldings and does not cause black pollution; and compared with the conventional molding sand added with the coal dust, the molding sand is better in casting application effect.

Description

technical field [0001] The invention relates to a molding sand for casting and a method for using the same. Background technique [0002] Molding sand must be used in the casting process. In the traditional wet sand molding process, a certain amount of coal powder is mostly added to the molding sand, because coal powder has a significant effect of anti-sticking sand and making the surface of the casting smooth. When the high-temperature molten iron is poured into the mold cavity, the molten iron and the coal powder in the molding sand burn to produce bright carbon, which separates the cavity from the molten iron that is about to solidify. However, adding coal powder to molding sand also has many disadvantages. First of all, "black pollution" is serious. The dust content of coal powder in the foundry is extremely high, which deteriorates the working environment. The combustion of coal powder produces harmful gases, which are harmful to the health of workers. Therefore, it is...

AI Technical Summary

Problems solved by technology

However, adding coal powder to molding sand also has many disadvantages.

First of all, "black pollution" is serious. The dust content of coal powder in the casting workshop is extremely high, which deteriorates the working environment. The combustion of coal powder produces harmful gases, which are harmful to the health of workers. Therefore, it is necessary to invest in environmental treatment. A certain cost; moreover, the sand with coal powder has poor air permeability, which makes the castings prone to porosity and affects product quality

Based on the above reasons, some foundries currently add some coal powder substitute additives when using molding sand, but the cost is also increased, and the application effect of some substitute additives is not satisfactory