证明水玻璃白云石砂的溃散性与铸件的大小、壁厚、浇注温度、吃砂量和打箱时间有关。
The collapsibility of the sodium silicate dolomite sand is controlled by the size, wall, pouring temperature, capacity for sand and draw time of the cast.
采用箱型截面的大型混凝土桥梁，其结构施工过程中浇注混凝土需要设置临时支撑结构。
Temporary structures are set up to support the formwork when a large concrete bridge with box-section is built.
通过对工具箱的塑件工艺分析，确定了直浇口浇注系统、推杆、顶板联合顶出的模具结构。
Through analyzing moulding technology of the toolbox, designed a injection mold with straight gate injection system, ejector rod and stripper plate united ejection mechanism.
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