Low pressure die casting (LPDC) machines employ vertical platen closure.
Molten metal is injected up into the die cavity by applying pressure to a holding furnace positioned beneath the fixed platen.
Pressure is maintained to the closed platens until the metal solidifies.
Die filling is very smooth and controlled.
This reduces risk of porosity that might cause defects or compromised mechanical performance.
Excellent dimensional accuracy and ‘straight-from-the-mould’ surface quality are also typical of the process (which in turn minimizes finishing costs).
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This process is ideally suited to producing axially symmetrical parts such as car wheels.
The fact that sand cores can be used within the die also means the process has become the ‘go-to’ option for producing parts with hollow sections and complex geometries.
With a longer average cycle time than High Pressure Die Casting, the technology is often used for shorter runs of more intricate components.