Article having diffuser holes and method of making same

Fluid reaction surfaces (i.e. – impellers) – With heating – cooling or thermal insulation means – Changing state mass within or fluid flow through working...

Reexamination Certificate

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Reexamination Certificate

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07883320

ABSTRACT:
The diffusion opening in the cooling hole of an airfoil is formed by an EDM process in which the outwardly flaring sidewalls of the opening, rather then having surfaces that are approximated to be smooth by having many small ribs formed therein, are formed with relatively few ribs with both longitudinally extending and radially extending surfaces that are substantially greater in dimension than those as normally formed. In this manner, the machining process is simplified and expedited, while at the same time, the cooling efficiency is increased.

REFERENCES:
patent: 4684323 (1987-08-01), Field
patent: 5637239 (1997-06-01), Adamski et al.
patent: 5939650 (1999-08-01), Higuerey et al.
patent: 6229113 (2001-05-01), Brown
patent: 6267552 (2001-07-01), Weigand
patent: 6359254 (2002-03-01), Brown
patent: 6390418 (2002-05-01), McCormick et al.
patent: 6627833 (2003-09-01), Varsell et al.
patent: 6979176 (2005-12-01), Nakamata et al.
Cover page and p. 208 ofHandbook of Hydraulic Resistance, Second Edition, Revised and Augmented, by I.E. Idenchik, Hemisphere Publishing Co., a subsidiary of Harper & Row, 1986 NY USA.
Internet pp. 1 and 2 from www.nnoble.com/wire—EDM.htm, Normal Noble, Inc., “Superior Wire EDM, Plunge EDM and Conventional EDM” We are the “House of EDM”.

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