# US 2013/0156558 A1 · Annular gas turbine engine case and method of manufacturing

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- Number: US 2013/0156558 A1
- Document ID: US20130156558A1
- Status: Published application
- Kind: A1
- Application number: 13/767,425
- Filed: 2013-02-14
- Published: 2013-06-20
- Earliest claimed: 2006-10-02
- Assignees: Pratt & Whitney Canada Corp.
- Inventors: Barry Barnett; Steven Hunt; Czeslaw Wojtyczka
- Web page: https://patentgrep.com/patent/US20130156558A1

## CPC

- F01D 25/24: Casings (modified for heating or cooling F01D25/14); Casing parts, e.g. diaphragms, casing fastenings (casings for rotary machines or engines in general F16M {; special arrangements in stators dealing with breaking-off of part of rotor F01D21/045})
- F05D 2230/232: by welding
- F05D 2230/26: by rolling
- F05D 2240/14: Casings or housings protecting or supporting assemblies within
- F05D 2250/231: cylindrical
- F05D 2250/232: conical
- Y02T 50/60: Efficient propulsion technologies, e.g. for aircraft
- Y10T 29/4932: Turbomachine making
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The method is used for making an annular gas turbine engine case from a preform. The method comprises comprising flowforming at least one section of the preform, and then outwardly bending at least one portion of the perform.

## Claims

### Claim 1

An annular gas turbine engine case comprising:
at least one flowformed section; and
at least one outwardly bent portion at each distal end thereof.

### Claim 2 (depends on 1)

The annular case as defined in claim 1, wherein the outwardly bend portion is a flange.

### Claim 3 (depends on 2)

The annular case as defined in claim 2, wherein the case comprises at least one machined portion on each flange.

### Claim 4 (depends on 3)

The annular case as defined in claim 3, wherein the case is a fan case.