Rotopeening method

Details Rotopeening method Rotopeening method

1985-05-07

1986-10-14

Gilden, Leon

Metal deforming

By shot-blasting

C21D 706

Patent

active

046164979

ABSTRACT:
A method of uniformly rotopeening the inside walls of metallic tubes to a desired final peening intensity by means of at least one rotatable peening flapper is disclosed herein. The method generally comprises the step of simultaneously rotating and orbiting the flapper within the tube while maintaining a selected stand-off distance between the inner edge of the flapper and the inside wall of the tube. The angular speed of the flapper and the stand-off distance are selected so that the slope of the curve defined by peening intensity over time is substantially flat in the vicinity of the desired final peening intensity. The method is particularly useful in uniformly and accurately peening the inside walls of the heat exchange tubes anchored in the tubesheet of a nuclear steam generator in order to relieve tensile stresses in the walls of these tubes which might otherwise lead to stress corrosion cracking in the tube walls.

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"Longer Life for Metal Parts by Shot Peening," R. R. Murray, Machine Design, Mar. 22, 1984, pp. 57-61.
U.S. application Ser. No. 613,674, filed May 24, 1984 for "Device for Shot-Peening Inside Surface of U-Bend Region of Heat Exchanger Tubing", by Douglas Harman et al.
Technical Brochure entitled "3M Brand Roto Peen Flap Assemblies Type TC 330", Building Service and Cleaning Products Division of 3M Corp., Cleveland, Ohio.

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