Foseco International Limited

David R Butler

Max G Neu

Jean P Villani

Roland Lenoir

Philip Sandford

George Snow

Alain Teyssedre

Clifford F Corbett

A mould (61) for metal casting has a mould cavity (62) and a sprue (63) communicating directly with the mould cavity (62) and located in the sprue (63) a sleeve (64) of refractory material having a cellular ceramic filter (65) fixed therein. The mould, which has no running system apart from the sprue, may be a sand mould or a metal die for producing castings by gravity or low pressure diecasting. The cellular ceramic filter may be a honeycomb type of structure having cells which extend between two outer surfaces of the filter or a structure having interconnecting cells such as a ceramic foam.

Moulds for metal casting and sleeves containing filters for use therein

Molten metal is cast in a mould having a feeder cavity, which may be defined by a feeder sleeve, whose surface has a plurality of elongate projections or ribs spaced apart around its perimeter, the number and dimensions of the ribs being such that the volume of the feeder cavity is reduced by at least 20% compared to a feeder cavity of generally the same size and shape but without the ribs. Preferably the ribs extend substantially the full length of the inner surface of the feeder sleeve. The sleeve may have for example four ribs whose shape and size is such that the horizontal cross-section of the feeder cavity defined by the sleeve is cruciform. The ribs may be formed of material having an exothermic, an exothermic and heat-insulating, or a heat-insulating composition. The ribs enable a given casting to be fed from a smaller quantity of feeder metal than is usual.

Molten metal casting and feeder sleeves for use therein

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Lichfield, United Kingdom

David R Butler