Method for making fins inside tubes usable for building heat exchangers and tubes obtained using this method

摘要

This invention realises a method for obtaining finning inside tubes usable for making heat exchangers. This method envisages the following operations: punching of at least one side 3, 151 of the tubular section 1, 15 along its length by means of one or more punches 30 until piercing of the punched wall and bending of said punched material towards the inside of the tubular space are provoked, in such a way as to make at least one fin 5, 16 with each punching operation; closing the holes 13, 19 in the outer wall of the tubular section after punching by coupling a section bar element, such as to ensure the hydraulic tightness of said tubular section. IMAGE