Patent ID: 7950146
Filing Date: 2011-05-31
Classification: B21J,B21K,B23P,F01D,Y10T

Abstract:
1. A method of forming a turbine rotor usable in a turbine engine, comprising: positioning an outer ring formed from a first heat resistant steel with a first thermal expansion coefficient and including an inner aperture having a first changing diameter proximate to a disk formed from a second low alloy steel with a second thermal expansion coefficient less than the first thermal expansion coefficient with an outer changing diameter that includes at least a portion of the outer changing diameter that is greater than a portion of the first changing diameter of the inner aperture of the ring; wherein an outer surface of the outer changing diameter of the disk is generally conical shaped; wherein an inner surface of the first changing diameter of the ring is generally conical shaped; heating the ring such that the first changing diameter grows to be larger than the outer changing diameter of the disk due to thermal expansion; placing the ring around the disk and allowing the ring to cool such that the inner surface of the inner aperture of the ring contacts the outer surface of the disk; and co-forging the ring and disk together.