Formula of clay sand

Abstract

The invention discloses a formula of clay sand, which comprises the following raw materials in percentage: 15 percent to 20 percent of yellow sand, 8 percent to 15 percent of green sand, 3.5 percent to 5 percent of high-temperature cement, 3 percent to 6 percent of quartz sand, 50 percent to 60 percent of secondary return sand, 3 percent to 5 percent of coal dust, 3 percent to 6 percent of bentonite and 0.5 percent of base powder. The water content of the formula is measured by 100 percent of each group of components and values, six measuring units of water are added, therefore, the formula of clay sand solves the defects of air holes, sand holes, roughness, unclear angular edges and the like caused by the problem of formula of the clay sand, and achieves the purpose of having complete condition of the whole surface appearance of the casting piece so as to improve finished product ratio and economic benefit.

Description

technical field

[0001] The invention relates to a formula of clay sand, and the proportion is suitable for use by small and medium-sized foundry enterprises. technical background

[0002] In addition to many other factors, the yield of castings is the key first step in the ratio of molding sand. Although the yield of molding with resin is better than that of clay sand, it is expensive and not suitable for small and medium-sized foundry enterprises. use. Therefore, most of the molding sand used by foundry manufacturers in the industry currently uses clay sand. Its characteristics are: "many surface defects, low precision, high labor intensity for subsequent cleaning, etc., but low price. The general formula is: yellow sand 20%-25%, green sand 10%-15%, secondary recycled sand 55%-65%, bentonite 6.5%-8%, coal powder 3.5%-4.5%, moisture 4.5%-5.5%, alkali powder 0.5%. Due to the formula, sand holes and pores on the casting surface , Casting, unclear edges and corners, and some...