Method of manufacture of heat-exchanger tube structured on...

Details Method of manufacture of heat-exchanger tube structured on... Method of manufacture of heat-exchanger tube structured on...

2005-04-19

2008-11-18

Bryant, David P (Department: 3726)

Metal working

Method of mechanical manufacture

Heat exchanger or boiler making

C029S890030, C029S890045, C029S890046, C029S890050, C029S890053

Reexamination Certificate

active

07451542

ABSTRACT:
The invention relates to a heat-exchanger tube structured on both sides with excellent heat transfer characteristics utilizing both outer and also inner fins and secondary grooves intersecting the inner fins. Two spaced-apart rolling tools are provided in the utilized device in order to form the outer fins of two adjacent rolling tools; the inner structure is formed by two differently profiled mandrels. The first mandrel forms in a first forming area the inner fins. The second mandrel forms in a second forming area the inventive secondary grooves into the earlier created inner fins.

REFERENCES:
patent: 4692978 (1987-09-01), Cunningham et al.
patent: 62-255794 (1987-11-01), None

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