Metal working – Method of mechanical manufacture – Impeller making
Reexamination Certificate
2007-06-05
2007-06-05
Bryant, David P. (Department: 3726)
Metal working
Method of mechanical manufacture
Impeller making
C029S889700, C029S023510, C029S558000, C409S132000
Reexamination Certificate
active
10687938
ABSTRACT:
A method for the manufacture of components composed of difficult-to-cut materials for gas turbines, in particular for manufacturing integrally bladed rotors for gas turbine aircraft engines, by producing recesses with one or more side walls, the recesses forming flow channels and the side walls forming blade surfaces, whereby material in the region of the flow channels is removed by a drilling process, and after the drilling process is finished the remaining material in the region of said flow channels is removed by a milling process. The unique combination of a drilling process followed by a milling process completing the material removal reduces significantly the manufacturing time.
REFERENCES:
patent: 3811163 (1974-05-01), Frederick et al.
patent: 6077002 (2000-06-01), Lowe
patent: 584282 (1945-08-01), None
European Search Report (Dec. 19, 2003).
Nowak Darek
Patel Ashok
Petraska Ray
Bryant David P.
Crowell & Moring LLP
Koehler Christopher M.
MTU Aero Engines GmbH
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