An advanced breaker core system with enhanced knock off properties for high pressure moulding applications

摘要

It is common practice in high pressure greensand moulding, to place feeder sleeves directly on to the pattern plate, an application technique known as ram-up. This technique is normally applied either because the cope mould is inaccessible, or there is insufficient time to insert sleeves after moulding. The use of high strength, highly exothermic sleeves in ram-up applications has expanded significantly since the late 1980's driven by the continued adoption of high pressure greensand moulding lines and a greater requirement for spot feeding. A particular problem applications on the latest moulding machines is that the moulding pressure has increased to such an extent that the sleeves and/or breaker cores may be damaged by the moulding operation.