ABSTRACT
Gravity die-casting is the simplest and most versatile of the die-casting methods. The molten metal is poured into the die, using the force of gravity to ensure that the die cavity is completely filled in the same manner as for sand casting. In low-pressure die-casting machine the dies are cheaper than for high-pressure methods since they can usually be made of cast iron, but they are sometimes more expensive than for gravity die-casting. Surface finish and wall thickness are better than can be achieved with gravity die-casting but poorer than high-pressure die-casting. Metal injection moulding (MIM) combines the technologies of powder metallurgy and injection moulding enabling the production of high integrity metal parts in complex shapes, yielding close tolerances, smooth surface finish and finely reproduced detail. Almost any metal that can be produced in a suitable powder form can be processed by metal injection moulding.
