A PRESS FOR DEFORMING A PLANAR SHEET HAVING AN OPEN-RING CONFORMATION UP TO GIVING THE PLANAR SHEET A HELICAL SWEEP

摘要

A press (1) for deforming a planar sheet (2) having an open-ring conformation up to giving the planar sheet (2) a helical sweep, comprising: a first deforming element (4), borne by a first arm (8), comprising a first wall (5) which conforms a helicoid sector defining a first helical axis (X); a second deforming element (6), borne by a second arm (9), comprising a second wall (7) which conforms the helicoid sector defining a second helical axis (Y).;The first arm (8) and the second arm (9) are rotatably coupled to one another, with respect to a relative rotation axis (Z), so that the first wall and the second wall are facing one another and so that the rotation axis (Z) is in a predetermined position so that, during the deformation of a portion (3) of the planar sheet (2), the first helical axis (X) and the second helical axis (Y) define between them an angle (α) that is greater than zero so that the deforming force decreases in a direction going from the internal edge (3a) to the external edge (3b) of the portion (3).