PROCEDIMENTO DI CONFORMAZIONE DI UN TUBO METALLICO IN PARTICOLARE PER SCAMBIATORE DI CALORE E SCAMBIATORE DI CALORE MUNITO DI TUBI COSI CON FORMATI

摘要

A method for conforming to a circular cross-section the end of a metallic tube of oblong cross-section for a heat exchanger, comprising two steps, one during which the end of the tube is subjected to a radial compression, and the other during which a punch having a diameter equal to that desired for the inner surface of the tube end is forcibly driven into said end.