Molding sand for casting nonferrous alloys

Abstract

The invention mainly relates to the field of casting and discloses molding sand for casting nonferrous alloys; the molding sand is made from, by weight, 62-64 parts of used sand, 16-18 parts of new sand, 6-8 parts of bentonite, 3-5 parts of sepiolite, 2.1-2.3 parts of talcum powder, 1.2-1.4 parts of titanium dioxide, and 5-7 parts of soybean meal; the raw materials are simple and have a wide range of sources, the molding sand is easy to prepare and low in cost, special molding sand for casting nonferrous alloys is added to the market and is light white in color, has influence on the color of nonferrous alloys, has suitable particle size, provides smooth surface for nonferrous alloys, has suitable breathability and can prevent the nonferrous alloys from forming air pores, defective rate is decreased, production efficiency is improved, and economic income is increased by 9.6%; the used sand in the raw materials has a deceased proportion, the used sand is screened first, ash and microparticles in the used sand are removed, breathability of the used sand is improved, high-temperature metal liquid is quickly cooled, the ash and microparticles are avoided being attacked by the metal liquid, and the smoothness and gloss of a nonferrous alloy is improved.

Description

technical field [0001] The invention mainly relates to the field of casting, in particular to a molding sand for casting non-ferrous alloys. Background technique [0002] Molding sand is a material used for molding in casting. Molding sand is generally mixed with molding materials such as raw sand for casting, molding sand binder and auxiliary additives in a certain proportion. Molding sand plays an extremely important role in foundry production. Because molding sand Casting waste caused by poor quality accounts for about 30-50% of the total casting waste. Usually, the requirements for molding sand include strength and thermal stability, fluidity, plasticity, air permeability and collapse, that is, whether the molding sand is solidified after the casting is solidified. Ease of damage and whether it is easy to remove from the casting. [0003] Non-ferrous alloys are widely used in automobiles, building materials, home appliances, electric power, machinery manufacturing and o...

AI Technical Summary

Problems solved by technology

[0003] Non-ferrous alloys are widely used in automobiles, building materials, home appliances, electric power, machinery manufacturing and other industries. With the development of downstream industries, the non-ferrous alloy manufacturing industry has also developed rapidly. The color of non-ferrous alloys is high, and the requirements for molding sand are also high. If the material diameter is too large, although the air permeability is good, the surface of the non-ferrous alloy is relatively rough and the finish is not good. The material diameter of the molding sand is too small, which leads to poor air permeability of the sand mold, and the non-ferrous alloy has pores. Although the existing molding sand can cast non-ferrous alloy , but the color of the molding sand will affect the non-ferrous alloys. After casting, cutting and grinding are required, which causes a lot of waste to the non-ferrous alloys, and also greatly reduces the production efficiency. A high-quality molding sand disclosed in the existing patent document CN 105057565 A and its preparation method, the raw materials are diverse, expensive, and contain toxic ingredients, which are harmful to human health during preparation and use, and there is no molding sand specially used for casting non-ferrous alloys on the market