提出颗粒型砂介质在压实过程中的两种特征：孔隙填充状态和颗粒滑动状态；
Based upon the experimental behavior of porous sand under squeezing, two types of status are defined to character the process: the filling of interval space, and the yielding slippage among sands.
真空压实造型技术，是一种新的型砂紧实工艺。
The vacuum squeeze moulding technique is a new technology for compacting moulding sand.
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