First a foam pattern is made, placed in a flask, and surrounded by sand. Then the flask is inserted.

First a foam
pattern is made, placed in a flask, and surrounded by sand. Then the flask is
inserted into a pressure vessel where a robot pours molten aluminum onto the
polystyrene pattern. A lid on the pressure vessel is closed, and a pressure of
1 MPa is applied to the casting until it solidifies (in about 15 minutes).

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