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 de
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.
대표청구항▼
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
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; andinserting a new inner portion within the outer portion and attaching the new inner portion to the flange. 2. The method as defined in claim 1, wherein after removing the cooled outer portion from the fixture, the flange extends at a third acute angle from the axial direction, the third angle being larger than the second angle and smaller than the first angle. 3. The method as defined in claim 1, wherein the third angle corresponds at least approximately to a blueprint angle of the flange. 4. The method as defined in claim 1, wherein attaching the new inner portion to the flange includes forming an EB weld between the new inner portion and the flange. 5. The method as defined in claim 1, wherein clamping the outer portion in the fixture includes conforming the outer element to a curved profile of the outer surface of the flange and conforming the inner element to a curved profile of the inner surface of the flange. 6. The method as defined in claim 1, wherein the material of the outer portion is an austenitic nickel-chromium-based superalloy, and heating the clamped outer portion includes heating to a temperature of from 1725° F. to 1775° F. for about one hour. 7. The method as defined in claim 1, wherein heating the clamped outer portion is performed under vacuum or partial pressure of argon. 8. The method as defined in claim 6, wherein forcing cooling of the heated clamped outer portion is performed until the outer portion has a temperature lower than 800° F., and before removing the outer portion of from the fixture, the method further comprising passively allowing the outer portion to cool from 800° F. to a handling temperature. 9. The method as defined in claim 1, wherein the inner portion includes a diffuser and a bearing housing, the method further comprising, before removing the damaged inner portion, detaching diffuser pipes from the damaged inner portion, and after inserting the new inner portion within the outer portion, attaching the diffuser pipes to the new inner portion. 10. A method of reforming an annular attachment flange at an extremity of an outer annular portion of a gas generator case of a gas turbine engine to a desired orientation for attachment to a remainder of the gas generator case, the method comprising: inserting a first fixture element within the annular portion made of a same material as that of the flange, the first fixture element conforming to an inner surface of the flange and forcing the flange radially outwardly passed the desired orientation;pressing the attachment flange against the first fixture element with a second annular fixture element made of a same material as that of the flange, 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; anddisengaging the cooled outer portion from the fixture elements so that the released flange extends at the desired orientation. 11. The method as defined in claim 10, wherein the desired orientation corresponds at least approximately to a blueprint orientation of the flange. 12. The method as defined in claim 10, wherein inserting the first fixture element within the annular portion includes conforming the first fixture element to a curved profile of the inner surface, and pressing the attachment flange with the second annular fixture element includes conforming the second fixture element to a curved profile of the outer surface. 13. The method as defined in claim 10, wherein the material of the outer portion is an austenitic nickel-chromium-based superalloy, and heating the outer portion includes heating to a temperature of from 1725° F. to 1775° F. for about one hour. 14. The method as defined in claim 13, wherein forcing cooling of the outer portion is performed until the outer portion has a temperature lower than 800° F., and before disengaging the outer portion of from the fixture elements, the method further comprising passively allowing the outer portion to cool to a handling temperature. 15. The method as defined in claim 10, wherein heating the outer portion is performed under vacuum or partial pressure of argon. 16. A gas generator case comprising an outer portion reformed following the method defined in claim 10, the outer portion surrounding and being concentric to an inner portion defining a diffuser at an upstream end thereof, a bearing housing connected to the diffuser and located radially inwardly thereof and concentrically thereto, and an annular attachment flange extending downstream from the upstream end and located radially outwardly of and concentrically to the diffuser, the inner portion being in a unused state, the attachment flanges of the inner and outer portions being interconnected. 17. The gas generator case as defined in claim 16, wherein the attachment flanges of the inner and outer portions are interconnected by an EB weld joint. 18. The gas generator case as defined in claim 16, wherein the inner and outer portions are made of an austenitic nickel-chromium-based superalloy.
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이 특허에 인용된 특허 (4)
Iwai Yasunori (Osaka JPX) Ogawa Akihisa (Hyogo JPX) Shinto Hiroaki (Aichi JPX) Masaki Masaru (Aichi JPX), Gas generator formed with electron beam welding.
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