Large aluminum castings give priority to the mold casting because the aluminum sand casting is cheaper than other casting method. Certainly aluminum sand casting has simple production process and short production cycle. When the wet type can not meet the requirement, you had better consider using clay sand table dry sand, dry sand mold or other sand mold.
Casting weight of the clay wet sand castings can reach from a few kilograms to tens of kilograms. But the weight of clay dry type of casting production can reach dozens of tons. Casting method and batch production all could adapt to each other. With the expensive equipment and casting, low pressure casting, die casting and centrifugal casting are only suitable for mass production. Large castings are not only suitable for single piece casting, but also suitable for mass production.
Large aluminum castings usually use the sand casting, and followed by the special casting method. Such as metal mold casting, investment casting and plaster casting. But sand casting can also be divided into clay sand, organic binder sand, self hardening resin sand, expendable pattern and so on. The mainly reasons for this phenomenon are several major pillar industry slow down the speed in industrial developed countries and competition of other engineering plastics, composites, ceramic.