| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method of caulking-joining metal sheets by which joining strength is improvable by increasing the thickness of a side wall part. Ž<P>SOLUTION: A plurality of metal plates are superposed and arranged on movable blades which are dividedly arranged on the outer periphery of a fixed anvil having a recessed conical surface toward the metal plate in the tip part and, by deforming the upside metal sheet plastically by locally thrusting a columnar punch having a projecting conical surface in the tip part in the metal sheet from the upper part into the metal sheet and also deforming an underside metal sheet plastically by releasing the movable blades respectively individually in the outer peripheral direction, the upper and lower metal sheets are mechanically joined. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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