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US 2011/0085913 A1Published application
Integrally rotating turbo machinery and method and apparatus for achieving the same
OwnerPaul S. Prevey, IIIinventor
Life of this patent
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Abstract
A method of inducing compressive residual stress of blading members integrally formed with a rotor. The method includes using a caliper-type burnishing tool such that the caliper arms of the tool are contoured and oriented for placing the burnishing elements on opposite sides of the blading member to be treated. The blading member is burnished to introduce a pre-determined pattern of residual compressive stresses in a selected area of the blade.
Claims7
A method of burnishing blading members affixed to a central rotor to induce compressive residual stress, the method comprising:
- positioning the rotor to permit the engagement of a burnishing tool with an individual blading member;
- engaging the burnishing tool with the blading member so as to simultaneously induce a desired compressive residual stress distribution in both sides of the blading member;
- traversing the burnishing tool over the surface of the blading member to induce a continuous zone of compressive residual stress in the surface of the blading member;
- disengaging the burnishing tool from the blading member;
- rotating the rotor;
- repeating the process until compressive residual stress has been induced in each blading member affixed to the rotor.
3 more elements
An article integrally formed with blading members comprising:
- a rotor;
- a plurality of blading members attached to said rotor, each said blading member having a pressure side and a suction side in opposition to one another and a perimeter defined by the leading edge, trailing edge, and tip of said blading member;
- wherein said blading members have continuous zones of compressive residual stress on said pressure side and said suction side of each said blading member, said continuous zones of compressive residual stress extending substantially along said perimeter of said blading member and extending inwards, towards the center of said blading member;
- wherein said continuous zones of compressive residual stress have an improved surface finish.
1 more element
Dependencies are inferred from the claim text.