型砂在型模周围成形，并根据需要安放闸道、浇道、冒口、排放口和浇注杯等。
Sand is formed about the patterns, and gates, runners, risers, vents and pouring cups are added as needed.
同时为了满足工艺设计的要求，对铸件本身和浇注系统、冒口的质量进行了精确统计。
At the same time, the weight of castings, riser and gating system is calculated accurately to meet the demand of the process design.
在此基础上，对工作石膏型采用合理的烘烤和浇注工艺，得到了尺寸合格、表面质量好的铸件。
Using proper baking and pouring process for plaster mold, the castings with qualified size and good surface quality could be obtained.
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