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摘要

This invention involves a method of making a unitary pattern assembly which is useful in forming an investment shell mold having an integral base for the conventional and directional solidification of molten metals and alloys. It comprises providing a yoke having a pattern capturing means and two leg members, providing a mold structure having a cavity comprising a pattern section and base section, positioning the mold structure and yoke to expose the capturing means and leg members to the pattern section and base section, respectively, forming a pattern having a base integral therewith in the cavity and removing the mold structure from the pattern and integral base. A unitary pattern assembly comprising a yoke and pattern, having an integral base, fixedly captured therein is obtained. The method is especially suitable for making a pattern assembly useful in the production of gas turbine engine blades by the "lost wax" process.