The contractive rates on both sides in symmetric part were basically of the same for horizontal pouring while of extreme difference for verticalpouring.
采用水平卧式浇注，铸件对称的两边收缩率基本相同；而采用垂直立式浇注，铸件对称的上下收缩率相差较大。
2
The perfect hammer head can be obtained by designing technological equipment, using verticalpouring and string casting process in CO2-sodium silicate sand.