Duplex peening and smoothing process

Details Duplex peening and smoothing process Duplex peening and smoothing process

1981-09-10

1984-01-31

Crosby, Gene P.

Metal deforming

By shot-blasting

416223R, C21D 706, F01D 514

Patent

active

044282133

ABSTRACT:
Disclosed is a two step process of peening for workpieces having small radii fillets or fragile edges, such as gas turbine airfoils have. In the first step, relatively small size shot of less than 1 mm dia is used to impart a first peening intensity to a workpiece. This results in a first relatively rough surface finish. In the second step, shot of substantially uniform diameter in the range 1-2.5 mm is impacted with uniform velocity to provide a surface finish smoother than 30AA (10.sup.-6 inch). When fillets are peened, improved fatigue life results from the duplex process. When used on edges, where direct edge impact is avoided in the second step, deformed edges are avoided by the process. Yet the workpiece is substantially smooth and the edges have the requisite residual stress distribution.

REFERENCES:
patent: 937180 (1909-10-01), Ridd
patent: 3073022 (1963-01-01), Bush et al.
patent: 3482423 (1969-12-01), Murray
patent: 3668913 (1972-06-01), Morris
patent: 3705511 (1972-12-01), Brandel
patent: 4034585 (1977-07-01), Straub
Metal Improvement Co. "Shot Peening Applications" 6th Ed. (1980) p. 35.

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