Metal Casting is a process of smelting metal material into a liquid that meets certain requirements and pouring it into a mould. After cooling and solidifying and finishing, a casting with a predetermined shape, size and performance is obtained. Because the casting blank is almost formed, the purpose of avoiding machining or small amount of machining reduces the cost and time to a certain extent. Casting is one of the basic processes of modern machinery manufacturing industry. One common used process is Sand casting.
Sand Casting
The basic raw materials for making sand moulds are foundry sand and sand binder. The most commonly used foundry sand is siliceous sand. When the high temperature performance of silica sand cannot meet the requirements for use, special sands such as zircon sand, chromite sand, and corundum sand are used. The most widely used sand binder is clay, and various dry or semi-dry oils, water-soluble silicates or phosphates, and various synthetic resins can be used as the sand binder. The outer sand mold used in sand casting is divided into three types: clay wet sand mold, clay dry sand mold, and chemically hardened sand mold according to the binder used in the molding sand and the way to build strength.
Advantage
Clay is rich in resources and cheap. Most of the used clay wet sand can be recovered and reused after proper treatment; the cycle for making molds is short and the work efficiency is high; the mixed sand can be used for a long time; Small pieces, large pieces, simple pieces, complex pieces, single pieces, large quantities can be used;
