Casting - is the process of manufacturing castings, filling the mold with molten material (foundry alloys, plastics, some of the rocks), and further processing of post-curing products.
In the most common sand casting foundry it is produced a model (previously - wood, now it is often used plastic models, obtained by rapid prototyping) are copied to a future item. The model is filled with sand or sand mixture (usually sand and binder) that fills the space between it and the two open boxes (mold)...