Gas generator case repair

摘要

A method of reforming an annular attachment flange of an outer annular portion of a gas generator case, including inserting a first fixture element within the annular portion, the first fixture element conforming to an inner surface of the flange and forcing the flange radially outwardly passed a desired orientation, pressing the attachment flange against the first fixture element with a second annular fixture element surrounding the flange and conforming to an outer surface of the flange, heating the outer portion pressed by the fixture elements to a temperature and time period corresponding to an annealing of the material of the outer portion, forcing cooling of the outer portion, and disengaging the cooled outer portion from the fixture elements so that the released flange extends at the desired orientation. A gas generator case including a reformed outer portion and an unused inner portion is also discussed.

主权项

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.