Die casting is where heated / molten metal is added under pressure to a mould. The first patent for die casting was granted in 1849 for manual mechanised printing types. Automated die casting became more popular during the 1960’s and is used extensively in factories creating parts eg car parts, tools.
Aluminium die casting uses aluminium alloy.
Start-up costs are pricey for the die casting machine, but the result is a high quality product with a long life span.
Hot chamber die casting is a faster method, has molten metal fed into the die. A powered piston then forces the metal through the into the die.
This method is a slower process than the hot chamber die casting and is what is used for aluminium die casting, to prevent iron from being picked up from the molten pool, as Aluminium has a higher melting point. The amount of aluminium needed is precisely calculated and transported to the cold chamber machine, and fed into an unheated injection cylinder. From here the aluminium is driven to into the die, sometimes using pressure.