Patent ID: 7047786
Filing Date: 2006-05-23
Classification: B21C,B21D,B21J,B23P,B24B,C21D

Abstract:
1. Tooling for working a structure to improve the fatigue strength at a selected location in said structure, said structure comprising a first surface, a second surface, and a body therebetween, said tooling comprising: a first indenter, said first indenter comprising a contacting end for engagement with and deformation of a pre-selected portion of said first surface of said structure to impart a residual stress profile in said body of said structure, and wherein said contacting end of said first indenter comprises a shaped surface profile substantially conforming to a dimple shape in said first surface of said structure produced by the application of a substantially uniform pressure profile on said pre-selected portion of said first surface of said structure, and wherein said contacting end of said first indenter further comprises a surface shape defined by the equation: wherein u v=Poisson's Ratio of the material comprising said workpiece; E=Elastic Modulus of the material comprising said workpiece; P a=radius of the contacting end of said indenter; and θ, r=polar coordinates of a selected surface location on said contacting end of said indenter. C=a constant ranging from 1 to 110.