Manufacturing – Casting methods - European Aluminium Association

1.3.2 Moulding process
Loose moulding sand is filled into the mould area formed by the pattern plate/pattern bolster,
the mould box and the filling frame. Compressed air is then forced through the mould to
compact the sand. The air flows through the sand from the back of the mould to the pattern
and escapes through vents in the pattern plate. The air flow thus moves the sand into the less
accessible regions of the pattern and greatly improves compaction.
The final strength in the mould is achieved in a subsequent pressing stage by means of a
fixed or flexible pressure plate, a water cushion or a multi-platen press. The pressure of the
press, as well as the pressure and duration of the air flow, can be controlled. This enables
optimum mould strengths tailored to the needs of the individual application.
Seiatsu process
Middle mould process
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