Methods for the production of curved pieces from continuous metal elements

A method for the production of a curved piece from a continuous metal element, which is a profiled element or a tube, extending along a longitudinal axis and advancing along a direction defined by said longitudinal axis, said method comprising the steps of:

• advancing said continuous metal element through a calendering station such that each length of the continuous metal element assumes a pre-established curvature,
• stopping advancement of the continuous metal element after a curved portion thereof has passed through a wrap-bending station located downstream of the calendering station and is supported by a support,
• wrap-bending the length of the element located at said wrap-bending station and gripped by a block, by rotation of said block and a body of the wrap-bending station about a fixed pivot, while simultaneously conveying said curved portion to a stretch-bending station, wherein a distal end of said continuous metal element is locked by a clamp,
• stretch-bending said curved portion by a rotary movement about a translating pivot of a shaping element which comes into contact with said curved portion,
• resuming advancement of the continuous metal element until the wrap-bent length is at a cutting station, and
• cutting said continuous metal element in the wrap-bent length, thus producing the curved piece.