Method of hermetically swaging tubes into tube plates

Details Method of hermetically swaging tubes into tube plates Method of hermetically swaging tubes into tube plates

1975-12-01

1976-09-14

DiPalma, Victor A.

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

29202D, 29421R, B21D 3906, B23P 1526

Patent

active

039798100

ABSTRACT:
A method of hermetically swaging tubes into the bores of heavy heat exchanger tube plates, by first expansion-swaging the inserted tube end portion under a very high hydraulic pressure and by then roll-swaging a portion of the expansion-swaged length portion, in order to replace the expansion-related tensile stress in the tubes with a compressive prestress, and in order to eliminate annular crevices at the inner edges of the tube plate bores.

REFERENCES:
patent: 1516704 (1924-11-01), Braun
patent: 2375235 (1945-05-01), Maxwell
patent: 2460580 (1949-02-01), Huber
patent: 3349465 (1967-10-01), La Pan et al.
patent: 3449812 (1969-06-01), Hauschke et al.
patent: 3608173 (1971-09-01), Watson et al.

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