Low pressure permanent mould casting

It is yet another version of permanent mould casting. In this gravity is not used for pouring melted metal into the mould but a low pressure of up to 1 atmosphere gas is put to melted metal. This continuous pressure on metal causes the mould to be completely filled and as a result there is no shrinking after cooling. In this process thin wall castings can be made. Mechanical properties are 50% better than permanent mould casting. As no riser is utilized the yield is usually higher as the metal in pressurized feed tube is still melted and the mould is ready for next shot right away.
low pressure die casting

High pressure die casting