Apparatus for transforming the cross-section of a thin-walled cy

Details Apparatus for transforming the cross-section of a thin-walled cy Apparatus for transforming the cross-section of a thin-walled cy

1975-12-19

1977-02-22

Larson, Lowell A.

Metal deforming

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

By use of deflector arranged to bend work transversely of...

72370, 29157R, B21D 4100

Patent

active

040085961

ABSTRACT:
An arrangement for working the interior cross-section of a thin-walled circular pipe or other cylinder to a symmetrical, non-circular cross-section such as a rectangular or a flat-oval form is described. The pipe to be worked is advanced over and into contact with a conforming mandrel whose outer surface has a cross-section that corresponds to the internal, initially round cross-section of the pipe. The mandrel is provided with an outer cross-section that varies axially from an input round cross-section corresponding to that of the pipe to an output cross-section that matches the final configuration of the worked pipe, while exhibiting a constant peripheral dimension throughout its length. The mandrel is made freely-rotatable about its axis as the pipe is advanced along and in contact with the mandrel in order to maintain a coaxial configuration of the resulting contoured pipe.

REFERENCES:
patent: 3056447 (1962-10-01), Powell et al.
patent: 3324534 (1967-06-01), Spurk
patent: 3662583 (1972-05-01), Moore

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