Verfahren zur Herstellung paarweise gegossener Metallwerkzeuge

摘要

A process for producing multipiece complementary tooling castings is disclosed in which hollow internal surfaces are cast in a mould (30) having a soft, low strength sand core piece (36) to define such hollow portions and external surfaces are cast against hard, resin-bonded sand mould surfaces (34). The castings are removed from their respective moulds while still warm and nested and pressed together to bring their working surfaces into conformance with each other. The result of this practice is a set of tool pieces that require little machining and display high accuracy in their as-cast condition.