| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a flat tube for a heat exchanger which can enhance the forming accuracy. SOLUTION: The inner face side of a folding part 5 of a plate material 4 is made into a protruding part 5a having the same height as that of a protrusion 6. Its outer face side is made into a recessed part 5b. Accordingly, bending of the plate material 4 into a V-shape can be performed with excellent accuracy without complicating the roll shape. When the plate material 4 is formed by overlapping it in the double folded state, the protruding part 5a becomes in a sold state by being overlapped in the double folded state from its center. As a result, the flat tube 1 can be formed with excellent accuracy without deviation of a folding point caused by its deformation in a re-striking process. COPYRIGHT: (C)2005,JPO&NCIPI
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