| 摘要 |
Metal is rigid, self supporting, gas permeable moulds (e.g. shell moulds) with one or more mould cavities (34) for moulding one or more parts, in which the mould cavities have gate passages open at their lower ends (35), by applying a reduced pressure to the upper surface of the mould and submerging the lower ends (35) of the gate passages beneath the surface of molten metal to fill the mould cavities with molten metal to produce unconnected metal parts or groups of parts. After filling the mould is withdrawn from the molten metal before deterioration of the mould due to heat can occur. <IMAGE> |
