Metal deforming – By shot-blasting
Patent
1984-05-24
1987-01-13
Husar, Francis S.
Metal deforming
By shot-blasting
29727, 72370, 74660, C05B 1700
Patent
active
046354565
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).
REFERENCES:
patent: 1905114 (1933-04-01), Lauterbur et al.
patent: 2971556 (1961-02-01), Armstrong et al.
patent: 3648498 (1972-03-01), Voss et al.
patent: 3903974 (1975-09-01), Cullen
patent: 4481802 (1984-11-01), Harman et al.
Harman Douglas G.
Odor Elbert P.
Abeles Daniel C.
Husar Francis S.
Showalter Robert
Westinghouse Electric Corp.
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