Sand moulds are created using various materials, the sand must be bonded together using either synthetic compounds or clay and water and moulds must be rebuilt after each casting. The design of moulds is a very complicated process, however, in general, they are filled simply by gravity without the need for any pressure differentials or mechanical action. Die Casting Die casting moulds are generally permanent and made of either cast iron or steel. High pressure die casting is the most commonly used process, in which molten aluminium is injected at high pressure into a metal mould by a hydraulically powered piston. The machinery needed for the process can be very costly and this high pressure die casting is only economic when used for high volume production.
Low pressure die casting uses a die which is filled from a pressurised crucible underneath.
The process is particularly suited to the production of rotationally symmetrical products such as automobile wheels. Gravity die casting is suitable for mass production and for fully mechanised casting. For more information on casting processes visit the European Aluminium Association . Your use of this site signifies your agreement to the Protocols and Guidelines of Use . All rights reserved.