Method of forming variably rifled tubes

Details Method of forming variably rifled tubes Method of forming variably rifled tubes

1979-09-10

1981-06-02

Bell, Paul A.

Metal fusion bonding

Process

With shaping

291573R, 72283, 72370, B23P 1526

Patent

active

042706904

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 a turbulence within the tube operative to break up 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 prevent overheating of the tube. The subject method includes the steps of providing a suitably dimensioned, smooth surface, hardened mandrel; wrapping a wire-like member on the hardened mandrel so as to form thereon a reverse image of the desired, variably patterned tube rifling; inserting the hardened mandrel into a tube; with the hardened mandrel so positioned in the tube producing a reduction in the tube diameter so as to cause the wire-like member to become embedded in the inner wall of the tube; and thereafter withdrawing the hardened mandrel from the tube while leaving the wire-like member embedded in the tube inner wall. In accord with this form of the invention, the ends of the wire-like member are preferably tack welded in place to prevent the dislodgment thereof. In accord with another form of the invention, the wire-like member subsequent to the withdrawal of the hardened member from the tube is also withdrawn therefrom leaving an impression thereof in the tube inner wall that is operative to effect the introduction of the turbulence, which is desired, into fluid flowing through the tube.

REFERENCES:
patent: 2708306 (1955-05-01), Lampton
patent: 3289451 (1966-12-01), Koch et al.
patent: 3422518 (1969-01-01), French
patent: 3543805 (1970-12-01), Matthews et al.
patent: 3768291 (1973-10-01), Rieger
patent: 3830087 (1974-08-01), Nakamura et al.

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