Tube bending apparatus and method

Details Tube bending apparatus and method Tube bending apparatus and method

1994-03-16

1995-11-07

Larson, Lowell A.

Metal deforming

By deflecting successively-presented portions of work during...

By use of work-contacting wiper and moving, work-holding form

72217, 72465, 72369, B21D 704, B21D 702

Patent

active

054638887

ABSTRACT:
A heat exchanger is disclosed, which comprises:
a plurality of tubes each having a U-shaped portion and arranged in a plurality of parallel bending planes, each bending plane containing a plurality of tubes of the same nominal outer diameter and of differing bending radius, the variation of the outer diameter of the tubes in at least one of the bending planes measured in a direction perpendicular to the bending planes being at most 0.1 mm; and
an antivibration bar disposed between two of the bending planes.

REFERENCES:
patent: 3545247 (1968-10-01), Fazzani
patent: 3878720 (1975-04-01), Stange et al.
patent: 3958440 (1976-05-01), Sassak
patent: 4052878 (1977-10-01), Connelly
patent: 4522055 (1985-06-01), Berger
patent: 4798073 (1989-01-01), Dischler
patent: 4890469 (1990-01-01), Dischler
patent: 5072786 (1991-12-01), Wachter
patent: 5125252 (1992-06-01), Ayers et al.
patent: 5127248 (1992-07-01), Sanseau

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