Sand casting is one of the casting processes. The mold used in sand casting is generally composed of an outer sand mold and a core. Because the molding materials used in sand casting are cheap and easy to obtain, the casting mold is simple to manufacture, and can be adapted to single-piece production, batch production and mass production of castings, and has been the basic process in casting production for a long time.
According to incomplete statistics, in the global casting production, sand molds gradually account for nearly 70%. And about 70% of them are produced with clay sand molds. The main reason is that compared with other casting methods, sand casting has low cost, simple production process and short production cycle. Therefore, castings such as engine cylinder blocks, cylinder heads, crankshafts, etc. of automobiles are produced by the clay green sand process. When the wet type cannot meet the requirements, consider using the clay sand surface dry sand type, dry sand type or other sand type. The weight of castings produced by clay wet sand casting can range from a few kilograms to tens of kilograms, while the castings produced by clay dry casting can weigh dozens of tons. Due to the above advantages of sand casting, sand casting is the preferred process for general foundries. Sand casting is the best choice when the density, surface finish and mechanical properties of the casting are not high.
