CORE POSITIONING

摘要

A method locates and maintains a core in fixed space relationship within the interior of shell mould. The method provides at least one pin extending into the core with at least one axial end of pin protruding from the core. A wax pattern having an outer surface is formed by encasing the core and at least one protruding axial end of pin in wax such that at least one protruding axial end of the pin terminates at the outer surface of wax pattern. A shell mould is formed around the wax pattern such that, upon removal of the wax pattern, and in subsequent casting process for production of hollow metal components, at least one protruding axial end of the pin abuts the shell mould thus fixing the pin and maintaining position of the core relative to the mould. The protruding axial end of the pin has an enlarged head.

主权项

1. A method of casting a component comprising:
locating and maintaining a core in a fixed space relationship within the interior of a shell mould comprising: providing at least one pin extending into the core with at least one axial end of the at least one pin protruding from the core, forming a wax pattern having an outer surface by encasing the core and the at least one protruding axial end of the at least one pin in wax such that the at least one protruding axial end of the at least one pin terminates at the outer surface of the wax pattern; and forming said shell mould around said wax pattern such that, upon removal of the wax pattern, and in the subsequent casting process for the production of a hollow metal component, the at least one protruding axial end of the pin abuts the shell mould thus fixing the at least one pin and maintaining the position of the core relative to the shell mould, after forming the shell mould, removing the wax pattern to leave the shell mould containing the core, firing the shell mould, and pouring molten metal into the shell mould around the core, wherein the at least one protruding axial end of the at least one pin has an enlarged head portion.