what is mould in casting

Mould in casting refers to the process of creating a cavity or form that carries a negative or reverse impression of an original model. The mould is then used to shape casting materials, creating duplicates of the model. In permanent mold casting, for example, reusable molds made from metal are used to create components such as gears, wheels, and automotive engine pistons. The most common process in permanent mold casting uses gravity to fill the mold, but gas pressure or a vacuum can also be used. The resulting cast will be an exact likeness of the shape of the hollow mold form. Casting materials are usually metals or various cold setting materials that cure after mixing two or more components together, such as epoxy, concrete, plaster, and clay.