Metal working – Method of mechanical manufacture – Impeller making
Reexamination Certificate
2005-03-01
2009-06-16
Chang, Rick K (Department: 3726)
Metal working
Method of mechanical manufacture
Impeller making
C029S889000, C029S889200, C029S889700
Reexamination Certificate
active
07546685
ABSTRACT:
A process for producing a rotor, the rotor formed thereby, as well as turbines in which such a rotor is installed. The rotor is formed by casting an ingot to have first and second regions formed of different alloys that intermix during casting to define a transition zone therebetween. The ingot is forged to yield a rotor forging that contains axially-aligned first and second alloy regions and a transition zone therebetween. The effects of the transition zone can be mitigated by modeling the transition zone and then off-center machining the forging so that the axis of rotation of the machined monolithic rotor is more centrally located with respect to the transition zone.
REFERENCES:
patent: 6350325 (2002-02-01), Ewald et al.
patent: 7065872 (2006-06-01), Ganesh et al.
Falsetti Robert V.
Ganesh Swami
Reed Francis Alexander
Schwant Robin Carl
Wang John Zhiqiang
Chang Rick K
General Electric Company
Hartman Domenica N. S.
Hartman Gary M.
Hartman & Hartman P.C.
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