low pressure die casting A metal mould, or die, is mounted on a above a sealed furnace containing molten metal. A riser tube connects the bottom of the die to the molten metal bath. The chamber containing the molten metal is pressureised (typically 20-100kPa), and the metal is forced up into the mould. Once the casting has solidified, the pressure is released and the molten metal falls back into the bath, and the casting ejected in preparation for the next cycle. In pressure die casting, metal is melted and forced into steel dies. The metal hardens into the desired shape. Molten metal is injected into a die cavity through a channel by movement of a plunger. After a preset solidification time, the plunger reverses direction, the part is ejected, and the machine is ready for the next cycle.