|Budget Amount *help
¥1,500,000 (Direct Cost : ¥1,500,000)
Fiscal Year 1998 : ¥900,000 (Direct Cost : ¥900,000)
Fiscal Year 1997 : ¥600,000 (Direct Cost : ¥600,000)
With regards to the two joining methods for melal parts utilizing plastic deformation, the joining process were analyzed using finite element method (FEM), in other words, treated by a virtual manufacturing method. One is rolling calk, which assembles shafts and plates, pressing the heads of the shafts by the rotating and revoluting tools. This method is used to make the small accurate apparatus snaller as the substitute of screw, but the bottle neck of the adoption is that the optimum conditions of joining must be persued through trial and error experiments. In the modeling, a conical tool is assumed to be rigid, and cylindrical shafts and plates deformable. Here, whereas the tool descends with rotation and revolution, it is considered it descends without rotation, because two rotating axes can not set by the FEM program. For this compasation, the friction coefficient between the tool and shafts were set zero. Thus, three dimensional, with rectangular solid elements, elastic plastic analysis were made possible.
The other is self-piecing junction, which join two metal plates by rivets without holes. Because preparing and positioning holes are unnecessary, a big effect can be expected in design and production, but the use is not magnified by the inability to get optimum conditions for joining. Then, assuming a die and rivets rigid, and plates deformable, analysis were also made possible, using two dimensional axisymmetrical model.
As mentioned above, the virtual manufacturing method in the field of joining parts utilizing plastic deformation was achieved.