| 摘要 |
A bottom casting apparatus comprises a pouring pipe, a stool, molds, and runners, wherein the runner satisfies the following equations (1) and (2) and a gap formed between a side wall of a groove for a runner provided in the stool and a runner brick is filled with heat resisting granules,where, A and B are widths (mm) at an upper portion and a bottom portion of the groove, respectively, D and E are widths (mm) at an upper portion and a bottom portion of the runner brick disposed within the groove, respectively, and Z is a mean coefficient of linear expansion (%) of the runner brick in the temperature range of a room temperature to 1000° C.
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