| 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 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 ) includes 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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