| 摘要 |
PROBLEM TO BE SOLVED: To increase productivity by reducing manufacturing time and improving casting quality, when manufacturing a magnesium alloy wheel by die-casting.SOLUTION: At each connection portion 160 between a spoke portion 150 and a rim portion 140, there are provided a bottom surface portion 161, inclined surface portions 162 and 163. The bottom surface portion 161 is narrower than the rim portion 140 with respect to a side-to-side direction, and extends in a direction orthogonal to a radial direction. The inclined surface portions 162 extend in directions away from each other, from both ends, with respect to a circumferential direction, of the bottom surface portion 161, to portions spaced apart from the bottom surface portion 161, in the rim portion 140. The inclined surface portions 163 extend in directions away from each other, from both ends, with respect to the side-to-side direction, of the bottom surface portion 161, to portions spaced apart from the bottom surface portion 161, in the rim portion 140.SELECTED DRAWING: Figure 7 |
