2008 年 49 巻 573 号 p. 0990-0994
he effect of hot shear spinning on the elimination of casting defects such as shrinkage cavities and dendrites in cast aluminum alloys was examined. Hot shear spinning is effective for achieving a large plastic deformation under a comparatively low forming load. Although many casting defects were formed in the cast blank, the shrinkage cavities and dendrites were successfully eliminated at an ironing ratio of above 20 %. The tensile strength and elongation of the formed parts were improved by eliminating the casting defects by hot shear spinning. The shear spinning process was simulated by the three-dimensional finite element method, and the casting defects were eliminated above an equivalent plastic strain of 1. It was found that hot shear spinning is effective for improving the mechanical properties of cast aluminum alloy parts.