Multifunctional casting moulding sand and manufacture method thereof

Abstract

The invention discloses multifunctional casting moulding sand, which is prepared from the following raw materials in parts by weight: quartz sand, limestone sand, clay, bentonite, zircon sand, attapulgite, corn powder, straw powder and water. The moulding sand is prepared from the following steps: uniformly dry-mixing the raw materials in the above parts by weight except for water, uniformly mixing the obtained dry mixed material with the water in above parts by weight, and storing for standby after placing statically. By strictly controlling the quartz sand, due to the granularity of the zircon sand, the surface of a casting is smooth, the breathability is good, good binding property is realized after the bentonite and clay are matched for use, and the cost is reduced; the regenerable low-cost crop corn powder is taken as a binder, the cost is low and resource is saved; the moulding sand of the present invention contains no coal powder, generates no pollutional waste gas and no toxic and pollutional harmful gas in the casting process, and is environment-friendly.

Description

Technical field [0001] The invention belongs to the field of foundry sand, and specifically relates to a multifunctional foundry sand and a manufacturing method thereof. Background technique [0002] The 21st century calls for "green casting". It is our basic national policy to protect the environment and achieve sustainable development. Foundry sand plays an important role in the environmental protection, green and clean production of foundries. Therefore, we have developed an environmentally friendly and less pollution-free, Casting sand with high fire resistance is of great significance to the current situation. [0003] The role of molding sand in casting production is extremely important. Casting waste caused by poor quality of molding sand accounts for about 30-50% of the total casting waste. Generally, the requirements for molding sand include strength and thermal stability, fluidity, plasticity, and air permeability. The general casting sand formula is too large or too sma...

AI Technical Summary

Problems solved by technology

[0003] The role of molding sand in foundry production is extremely important. The casting waste caused by poor quality of molding sand accounts for about 30-50% of the total casting waste. Usually, the requirements for molding sand include strength and thermal stability, fluidity, plasticity, and air permeability. and collapsibility; in the general casting sand formula, the sand particle size is too large or too small, and the sand material diameter is too large. Although the air permeability is good, the surface of the casting is rough, the finish is not good, and the sand material diameter is too small. , resulting in poor air permeability of the sand mold, and the casting has pores; castings often have various casting defects during the production process, such as sand holes, cracks, pores, shrinkage cavities, etc., and the generation of cracks is related to the condensation speed of the casting. In the prior art, quartz sand is used as casting sand to condense castings, but the condensation ability of quartz sand is weak, and the expansion coefficient is large. Simply using quartz sand and clay will cause local sudden expansion of castings, resulting in local condensation of castings, thus making castings Uneven condensation speed, stress, easy to produce cracks and shrinkage cavities; many types of sand on the market have poor recovery performance, and the recycled sand has poor usability, poor air permeability, and castings are prone to pores; Dispersion is not good, sand hands

[0004] The feeling is hard, and the mold is easy to break; although some molding sands have good plasticity and high wet strength, they are prone to have many sand beans and poor collapsibility.