Metal deforming – By shot-blasting
Patent
1985-05-07
1986-10-28
Gilden, Leon
Metal deforming
By shot-blasting
B24C 316, C21D 706
Patent
active
046191283
ABSTRACT:
A rigid peening spindle for rotopeening the inside wall of a tube is disclosed herein. Generally, the peening spindle comprises a rotatable housing insertable within a tube, a mandrel disposed within the housing and having a plurality of peening flappers connected thereto, and a pair of bearings for rotatably mounting the mandrel within the housing in an off-center orientation relative to the longitudinal axis of the housing so that the peening flappers rotate and orbit within the tube when the mandrel and housing are simultaneously rotated. The housing includes a cage formed from an open section and a ligment, and the mandrel is rotatably mounted within the housing so that the peening flappers may engage the inside wall of the tube through the open section of the cage. Finally, each of the bearings which rotatably mount the mandrel in an off-center manner preferably have an outer diameter slightly larger than the outer diameter of the housing so that they may engage the inside wall of the tube in a running engagement within fairly tight tolerances, and thereby control the stand-off distance between the peening flappers and the inside wall of the tube. The bearings are preferably made from a self-lubricating plastic material. The invention is particularly useful in rotopeening the interior walls of the heat exchange tubes of a nuclear steam generator in order to prevent stress corrosion cracking in the tubes.
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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 Serial 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.
Bevilacqua Bruce W.
Green Richard A.
Harman Douglas G.
DePaul L. A.
Gilden Leon
Westinghouse Electric Corp.
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