Method and device for manufacturing a bent product

A method of manufacturing a bent product comprising: support, in a first position (A), of an elongated metal material (1), having a shape of secciontransversal closed, while advanced in its longitudinal direction, heating Local, in a second position (B) of metallic material which is being advanced, the second position (B) downstream of the first position in the feed direction materialmetalico, cooling the portion of the metal element being, which it was heated in the second position (B), in unatercera position (C) downstream of the second position in the direction of advance of the metal material, also ycaracterizado to understand the change in position of a means (15) clamping holding the metallic material in a region (D) delmaterial metal downstream of the third position in the feed direction of the metal material, in tridimensional unadireccion including at least the forward direction of the metallic material within a espaciode work including a common space above the third position (C) in the direction of metal delmaterial advance to impart a bending moment to the heated portion of the metal material, manufacturing asiun bent product having a three-dimensionally bent portion, intermittently or continuously, inthe longitudinal direction of the product.