Method of manufacturing tube and apparatus for manufacturing...

Details Method of manufacturing tube and apparatus for manufacturing... Method of manufacturing tube and apparatus for manufacturing...

2005-06-14

2005-06-14

Hong, John C. (Department: 3726)

Metal working

Method of mechanical manufacture

Heat exchanger or boiler making

Reexamination Certificate

active

06904677

ABSTRACT:
In a method of manufacturing a tube that has a plurality of projections (dimples) protruding inwardly from an inside wall of the tube other than a longitudinal end, a work, which is a material of the tube and in a form of band plate, is shaped by a roller to form projections while the work is continuously fed. Then, the projections formed at a predetermined portion of the work are crushed so that the predetermined portion of the work is flattened. Therefore, the projections are formed continuously while the work is continuously fed. It is possible to deal with variations of length of the tube without exchanging a projection-forming roller, thereby improving productivity.

REFERENCES:
patent: 5209800 (1993-05-01), Spencer et al.
patent: 63-049303 (1988-03-01), None
patent: 6-159986 (1994-06-01), None
patent: WO/95/05571 (1995-02-01), None

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