Process and apparatus for continuously transforming a strip to a

Details Process and apparatus for continuously transforming a strip to a Process and apparatus for continuously transforming a strip to a

1978-05-11

1980-05-27

Combs, Ervin M.

Metal deforming

By tool-couple pressing together adjacent surface portions...

To form longitudinally-seamed tube

72176, B21D 510, B21D 5100

Patent

active

042044154

ABSTRACT:
A process and apparatus for continuously transforming a flat metal strip into an elongated pipe, in which the strip is fed through a forming tool along a curved forming path wherein the longitudinal edge portions are progressively turned up into cross-sectionally arcuate portions leaving between a substantially cross-sectionally rectilinear section, the width of which progressively decreases during travel of the strip through the forming tool. The curved forming path in the tool is such that it has a radius of curvature R(z) in its longitudinal direction, the arcuate portions each having a radius r.sub.o and the decreasing width of said rectilinear section being 2x(z) (wherein z is the distance of travel through the tool). The radius of curvature R(z) is controlled in sole dependence on r.sub.o and the differential quotient x'(z). In the resulting elongated tube, relative differences in travel distance between arbitrary areas in a transverse cross-section of the strip forming the pipe are substantially completely eliminated without plastic deformation in the longitudinal direction.

REFERENCES:
patent: 2290184 (1942-07-01), Higgins
patent: 3869902 (1975-03-01), Iyengar et al.
patent: 4070887 (1978-01-01), Hankin

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