Investment moulding process and apparatus

摘要

An investment mould process for forming a cast member is described. The process comprises forming a precursor casting ( 12 ) from a master mould ( 10 ). The master mould ( 10 ) has an internal surface ( 16 ) defining a space ( 14 ) in which the precursor casting ( 12 ) can be formed. The surface ( 16 ) defines a location indentation ( 20 ) to provide a corresponding location projection ( 3 ) on the precursor casting ( 12 ). A holding member ( 22 ) can be inserted into the location projection ( 3 ) to hold an internal member ( 17 A, 17 B).