Patent ID: 6668904
Filing Date: 2003-12-30
Classification: B22C

Abstract:
Method of producing casting moulds or mould parts in a mould forming machine comprising at least one moulding chamber with at least one movable squeeze plate and at least one pattern, said method comprising the steps of:a) filling the at least one moulding chamber with compressible mould material, b) applying a vacuum at selected parts of the at least one pattern during said filling step, c) pressing the mould material by moving the at least one squeeze plate, and d) removing the produced mould or mould parts from the at least one moulding chamber, making the at least one moulding chamber ready for a new cycle starting from the filling step, said method being characterized by further comprising the steps ofb1) applying said vacuum to at least two different parts of the at least one pattern at different periods of time during said filling step.