采用差压铸造工艺，研究垂直缝隙式浇注系统浇注的铝合金硅铸件不同位置的组织和力学性能变化。
Different site microstructure and mechanical properties of aluminum-silicon alloy in differential pressure casting process were investigated. The gate system was adopted vertical slitting gate system.
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。
The contractive rates on both sides in symmetric part were basically of the same for horizontal pouring while of extreme difference for vertical pouring.
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