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Title:
TREATER FOR U-SHAPED PIPE BEND REGION
Document Type and Number:
Japanese Patent JPS614671
Kind Code:
A
Abstract:
Apparatus (10) for imparting protecting compressive stresses to the inside surfaces of a U-shaped heat exchanger tube (12) in order to eliminate or substantially reduce residual tensile stresses within the U-bend region of the U-shaped heat exchanger tube (12) as a result of the fabrication of the U-shaped tube (12) under cold bending techniques comprises a high-speed rotary drive motor (22), flexible drive shafts (28, 30) extending throughout the axial length of the U-bend region of the U-shaped tube (12), and shot-peening flaps (32) having tungsten-carbide shot particles secured thereto. A plurality of epicyclic gear trains (26) are axially spaced along the flexible drive shafts (28, 30) so as to cause the shot-peening flaps (32) to orbit about the interior surface of the U-bend region of the U-shaped tube (12) simultaneously with the high-speed rotary drive of the flexible drive shafts (28, 30).

Inventors:
DAGURASU GUREI HAAMAN
ERUBAATO PATAASON ODOORU
Application Number:
JP11061685A
Publication Date:
January 10, 1986
Filing Date:
May 24, 1985
Export Citation:
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Assignee:
WESTINGHOUSE ELECTRIC CORP
International Classes:
B24C1/10; B23P9/04; B24B39/02; C21D7/06; F28D7/06; (IPC1-7): B24C1/10; F28D7/06



 
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