(57) A method and a machine for shaping the edges (12, 13) of a roll bent metal piece
(10), more particularly tubular or annular members (10) from a metal sheet or a sectional
bar; the flat or non-curved longitudinal edges (12, 13) of the roll bent metal piece
(10) are subjected to a roll shaping step of making it move forwards with one or both
edges (12, 13) clamped between opposing shaping elements (25, 26); the shaping elements
are rotatably supported to act on the internal and on the external surfaces respectively
of the bent piece (10) in order to provide the flat edges (12,13) of the same bent
piece (10) with the required circular shape.
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