Long tube having a small diameter

Details Long tube having a small diameter Long tube having a small diameter

1992-11-19

1993-10-19

Larson, Lowell A.

Pipes and tubular conduits

With flow regulators and/or baffles

Flow facilitating

138 37, 138177, F15D 100

Patent

active

052536785

ABSTRACT:
A method of manufacturing a long tube having a small diameter, such as a tube for use in a heat exchanger, by cold working. A plug drawing using a pressurized lubricating oil of 500 kgf/cm.sup.2 or more accompanied by the reduction in wall-thickness is adopted as at least the final cold work. In the case where a tube having desired dimensions is not obtained by this plug drawing, subsequent free-loaded drawing can be conducted.

REFERENCES:
patent: 1076545 (1913-10-01), Blaxter
patent: 2369629 (1945-02-01), Wood et al.
patent: 3021596 (1962-02-01), Yowell et al.
patent: 3661005 (1972-05-01), Petersen et al.
patent: 3798943 (1974-03-01), Benteler et al.

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