Co-forged steel rotor component for steam and gas turbine...

Metal working – Method of mechanical manufacture – Impeller making

Reexamination Certificate

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C416S24400R, C416S20400A, C029S889210

Reexamination Certificate

active

07950146

ABSTRACT:
A method of forming a rotor for a turbine engine such that the rotor is formed of two materials including: an outer ring formed from a first steel material, and a disk formed from a second material, such as a low alloy steel, having a larger thermal expansion coefficient than the first material forming the inner disk. The ring may include an inner aperture having a conical shape, and the disk may have an outer surface with a conical shape and a diameter with a portion that is larger than a portion of the ring. The ring may be heated such that the aperture expands to a size greater than the largest diameter of the inner disk. The ring may be positioned over the disk and allowed to cool to allow the ring to be attached to the disk. The ring and disk may then be co-forged.

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