| 摘要 |
PURPOSE: To guarantee an economical manufacture of multiple finned tubes and to improve the heat conduction performance of finned tubes. CONSTITUTION: A rolling is carried out by use of at least one rolling tool 5 which is in contact with a tube, a flat tube 1' is supported by a rolling mandrel 8 located inside the tube, a formed finned tube 1 is supported by a rolling force and fed forward corresponding to a formed fin 2, and the number N of installed rolling tools is matched to a required number n of fins so that one or each of plural rolling tools form plural integral fins, at a type of fins whose heights are gradually increasing, from a non-deformed and flat tube. |
