Method of making variably rifled tubes

Details Method of making variably rifled tubes Method of making variably rifled tubes

1979-09-10

1982-02-02

McGlynn, Joseph H.

Electric heating

Metal heating

Wire, rod, or bar bonding

291573R, 219107, 228173E, B21D 5306, B23K 1132

Patent

active

043141307

ABSTRACT:
A method of providing tubes of the type intended primarily for use in boilers with a variably rifled interior surface. The function of the latter surface is to create turbulence within the tube operative to break up the laminar flow of the water or steam flowing therethrough so as to thereby promote more efficient heat transfer during steam generation and so as to minimize the susceptibility of the tube to overheat due to the effects of nucleate boiling. The subject method, which is predicated upon a determination of the rifled pattern that is required to provide the boiler tube with the desired heat transfer characteristics, includes the steps of providing a tube that it is desired to furnish with variable rifling, supporting the tube for rotation relative to the longitudinal axis thereof; providing a length of wire that is to be made to embody the configuration of the pattern of variable rifling desired; providing means for affixing the wire to the surface of the inner wall of the tube; inserting the length of wire into the tube interior while simultaneously effecting the rotation of the tube so as to thereby cause the wire to adopt the configuration of the pattern of variable rifling with which it is desired to provide the tube; and concomitant with the formation of a pattern of variable rifling with the length of wire, effecting the affixation of the wire to the inner wall of the tube so that the wire, when secured in place, embodies the configuration of the pattern of variable rifling that is sought to be provided in the tube.

REFERENCES:
patent: 2708306 (1955-05-01), Lampton
patent: 2917820 (1959-12-01), Matheny
patent: 3595299 (1971-07-01), Weishaupt et al.
patent: 3785409 (1974-01-01), Smith

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