Multiple alloy rotor and method therefor

Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – With runner shaft of specific shape or material

Reexamination Certificate

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Reexamination Certificate

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06971850

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: 5487082 (1996-01-01), Takenouchi et al.
patent: 5524019 (1996-06-01), Takenouchi et al.
patent: 6092989 (2000-07-01), Siga et al.
patent: 6350325 (2002-02-01), Ewald et al.
patent: 6499946 (2002-12-01), Yamada et al.

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