| 摘要 |
A semi-molten or semi-solid molding method is used to cast a scroll member having a tabular panel, a spiral section, and a columnar part. The method includes filling a cavity formed inside of the molding die with semi-molten or semi-solid metal from a section for forming the columnar part via a runner that forms a channel. The cavity forms a space for casting the scroll member. An angle of intersection &thetas;1 between the runner and the section for forming the columnar part is set such that to 97°≦̸&thetas;1≦̸135°, and/or a ratio R/√S is set such that 0.12≦̸R/√S≦̸0.96. R is a radius of curvature of a chamfered section in which the runner intersects the section for forming the columnar part, and √S is the square root of a cross-sectional area S of the section for forming the columnar part. |
