Metal working – Method of mechanical manufacture – Impeller making
Reexamination Certificate
2006-12-30
2011-11-08
Chang, Richard (Department: 3726)
Metal working
Method of mechanical manufacture
Impeller making
C029S090010, C029S090700, C072S053000, C072S075000
Reexamination Certificate
active
08051565
ABSTRACT:
A method of reducing crack propagation in an airfoil includes: providing an airfoil having a root spaced apart from a tip, spaced-apart leading and trailing edges, a suction side extending from the leading edge to the trailing edge, and an opposed pressure side extending from the leading edge and the trailing edge, supporting the airfoil against bending loads; and burnishing the airfoil using a burnishing element, so as to create at least one burnished section of residual compressive stress, the at least one burnished section being located adjacent the leading edge and spaced from the leading edge by an offset distance selected so as to avoid deformation of the leading edge.
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Brunck Michael Jay
Dingwell William Terence
Imhoff William Lee
Lombardo Dale Robert
Luna Alberto
Chang Richard
Clement David J.
General Electric Company
Trego, Hines & Ladenheim PLLC
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