Patent ID: 8968493
Filing Date: 2015-03-03
Classification: B23P,F01D,F05D,F23R,Y10T

Abstract:
1. A method of repairing a gas generator case of a gas turbine engine, the case having an outer annular portion surrounding a damaged inner portion and having an annular flange at one end thereof defining a sole connection between the outer and inner portions, the annular flange extending at a first acute angle from an axial direction of the case, the method comprising: cutting between the annular flange and the inner portion along a circular path concentric with the flange; removing the damaged inner portion; clamping the outer portion in a fixture having an outer element conforming to an outer surface of the annular flange and an inner element conforming to an inner surface of the annular flange and pressing against the outer element, the fixture forcing the annular flange to a second acute angle from the axial direction smaller than the first angle, the fixture being made of a same material as that of the outer portion; heating the clamped outer portion to a temperature and time period corresponding to an annealing of the material of the outer portion; forcing cooling of the outer portion; removing the cooled outer portion from the fixture; and inserting a new inner portion within the outer portion and attaching the new inner portion to the flange.