| 摘要 |
PCT No. PCT/FR95/01157 Sec. 371 Date Mar. 6, 1998 Sec. 102(e) Date Mar. 6, 1998 PCT Filed Sep. 8, 1995 PCT Pub. No. WO97/09575 PCT Pub. Date Mar. 13, 1997PURPOSE: To facilitate a bending of a core and to reduce a resistance of fluid by a method wherein a fin at one end is overlapped integrally between each of rows from a deformation part of the core and the other end fin is separated for each of the rows and contacted and fixed to a tube, respectively. CONSTITUTION: Tubes 1 and 2 are arranged in a thickness direction of a core. The tubes pass through several fins 3 and 4. The fin 3 is provided with tube insertion holes of circular form in two rows. Outside tube and the core part formed by the fin 4 are projected longer than that of the core. A reamer is placed within the tube to expand an outer diameter and then the tube is press fitted to the fin. A bending machining guide jig 6 is placed within the core, an external force is applied to the core as indicated by an arrow and bent. In this way, since only the fin at the bent portion is separated for every tube, its bending may easily be carried out and at the same time it is possible to reduce a fluid resistance with the integral fin 3.
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