| 摘要 |
A control element (1) adapted to prevent an external-flange angle iron from being twisted during its bending is applied to a variable-radius bending machine, on which an angle iron (10) is worked by deformation by means of at least two couples of lower co-axial rollers (7, 8, 7', 8') and at least a third upper roller (9), the one flange (11) of the angle iron (10) being clamped by the lower rollers (7, 8, 7', 8'), and the other flange (12) facing outward. The control element (1) comprises a frustoconical head (2) pivoted on a stem (3) designed to be received into a co-axial housing hole that is frontally performed on the support element (13) of a cylindrical control roller (14), having three degrees of freedom, of the bending machine.
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