Apparatus for bending a straight tube into a serpentine tube

Details Apparatus for bending a straight tube into a serpentine tube Apparatus for bending a straight tube into a serpentine tube

1981-11-03

1982-09-28

Combs, Ervin M.

Metal deforming

By relatively movable offset tool-faces

Embodying three or more coacting relatively movable tools

72217, 72390, B21D 702, B21D 3100

Patent

active

043511783

ABSTRACT:
Apparatus for producing a serpentine tube by bending a straight tube including a plurality of dies each having an arcuate surface, the dies being arranged alternately on opposite sides of the straight tube and movable in a direction toward the center axis of the straight tube and at the same time in a direction intersecting the center axis of the straight tube. During a bending operation, the dies are spaced apart from one another in a manner to impart to the straight tube and the serpentine tube such a dimensional relationship that no excess material is produced in the tube. Each die forms a set with two wings, the two wings being operative to force the straight tube against the arcuate surface of the associated die while rotatingly moving for a circumferential extent of 90 degrees each along the arcuate surface of the die. Each set of die and wings is mounted on one of a plurality of front-to-rear ball screws supported for movement by a plurality of left-to-right ball screws. The front-to-rear ball screws and the left-to-right ball screws have their movements controlled by respective pulse motors.

REFERENCES:
patent: 1462315 (1923-07-01), Akey et al.
patent: 1501388 (1924-07-01), Baker
patent: 3168129 (1965-02-01), Henry
patent: 3429168 (1969-02-01), Pearson et al.
patent: 3597956 (1971-08-01), Clausing
patent: 3628369 (1971-12-01), Williamson
patent: 3908425 (1975-09-01), Ware
patent: 4141235 (1979-02-01), Ishihara

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