PROCEDIMENTO PER LA CURVATURA DI TUBI, FILI O NASTRI DI METALLO A SERPENTINA O A MOLLA E MACCHINAPER CURVA TUBI, FILI O NASTRI DI METALLO PER LA FABBRICAZIONE DI UNA SERPENTINA O UNA MOLLA PRESENTANTE UN ANDAMENTO AD ELICA COMPRENDENTE UNA PLURALITÀ DI SPIRE

摘要

The present invention concerns a procedure and a machine for bending filiform material such as a tube, a wire, a bar, a strip of metal into coil or spring, preferably helicoidal, comprising continuously bending a single filiform material (3) into a coil or a spring so that the filiform material (3) assumes a helical course comprising a plurality of turns (S). The procedure comprises the steps of measuring the radius of curvature (R) of a first bent portion (3c) comparing it with a pre-defined ideal radius of curvature (R I ), applying a correction if necessary. The procedure also comprises measuring the diameter (D) of a turn (S I ) during the bending and comparing it with a pre-defined ideal diameter (D I ). On the basis of this comparison, the ideal radius of curvature (R I ) is modified to correct the course of the curvature. The machine employs a sensor (8) and a CPU.