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3.2. Shapes of the mandrel and workpiece In a conventional spinning process, the final shape of the product is almost identical to that of the mandrel used. In this study, a man-drel having the shape of a truncated elliptical cone is used in the first trial experiment on asymmetric spinning so that the experimental results can be easily compared with those obtained in axisymmetric cone spinning. The shape and dimensions of the asymmetric man-drel (truncated elliptical cone), axisymmetric mandrel (truncated cone), and roller are shown in Fig. 3. The half-cone angle of the man-drel, ˇ, is set to 60◦ and one-path spinning was successfully carried out. The roller is equipped with a ball bearing at its center to reduce friction generated during its rotation in the spinning process. Cold-rolled commercially available pure aluminum sheets (composition: Si 0.11 wt%, Fe 0.51 wt%, Cu 0.12 wt%, and Ti 0.03 wt%) with a thickness of 1 mm were used in this study. The shapes of the metal sheets (workpieces) used for asymmetric and axisymmetric spinning are shown in Fig. 4. The long axis of the elliptical workpiece was aligned parallel to the rolling direction. Prior to their use in the spinning experiments, the workpieces were annealed at 673 K for 1 h for elimination of residual stress. The mechanical properties of the materials obtained by carrying out uniaxial tensile tests on three specimens, whose axis are aligned at 0◦ , 45◦ , and 90◦ to the rolling direction are summarized in Table 2. |
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