| 摘要 |
PROBLEM TO BE SOLVED: To provide a joined structural body capable of securing a high dimensional precision and toughness and having a high freedom in design and its manufacturing method. SOLUTION: By closing a switch SW connected to a cable 16, an electric power source is supplied to an electromagnetic tube expanding coil 15 from the cable 16. As a result, the section accommodated inside a flange face 1a of a cylindrical joining member 4 is instantly expanded. Further, the section protruding from the flange face 1a of the cylindrical joining member 4 is fallen down outward and is brought into tight contact with an outer face of the flange face 1a. Also, a depth of a groove 14c is smaller than an interval between the electromagnetic coil 15 and a side face of the groove 14c, a lower end part of the cylindrical joining member 4 is deformed without receiving the resistance due to a side member support fixture 14. Further, the force to expand a hole 2b, etc., only is applied to a cross member 2, 3, fluctuation in its dimension is hardly generated.
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