| 摘要 |
PURPOSE:To prevent the shift of a laminated layers in an iron core after the rivetting work, by forming dish-shaped convex portions around the outside of the throughholes for rivetting thin plates for lamination. CONSTITUTION:A dish-shaped or spherical-shaped convex portion 3b is formed around the outside of the throughhole 3a for rivetting a thin plate 2a for lamination. A required number of the thin laminating plates 2a are laminated so that said convex portion 3b is coupled with a concave portion 3c of the bottom side of the next thin plate. Then, a rivet 4 is inserted, caulked, and tightenend. In this method, the shift between the laminated layers in an iron core is not generated after the rivetting work. |
