Method of peening airfoils and thin edged workpieces
AssigneeUnited Technologies Corporation
InventorsJames W. Neal, Joseph F. Loersch
Life of this patent
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Abstract
Shot peening of thin edges of workpieces which are subject to deformation damage by direct impacts is accomplished by rotating the workpiece edge near centerline through a particular angle measured from the normal to the shot streamline. The angle is sufficient to cause oblique blows on the centerline of the edge, but insufficient to cause direct impacts. Compressive stresses by the oblique blows provide residual compressive stresses along the centerline to the desired depth. The angle is calcuable from the edge radius, the depth of stressing desired at the centerline, and the depth of stressing produced by shot at a reference location. Oscillatory rotation is preferably used to obtain even peening.
Claims5
The method of peening the edge of a workpiece comprising directing a stream of shot along a substantially collimated path, characterized by rotating the centerline of the workpiece edge through an angle C with respect to the normal to the shot path, said angle C being less than 90 degrees, and sufficient to cause oblique impacts at the tangent to the centerline of the edge, but insufficient to cause impacts normal to said tangent, the oblique impacts at points on the edge causing a residual compressive stress along said centerline.
Dependencies are inferred from the claim text.