试验结果表明，铸铁件流动前沿不仅存在明显的气隙，而且采用聚苯乙烯模样材料，负压下浇注时，其气隙压力低于1个大气压。
The results indicated that there exists obvious gas gap in molten iron flowing front, and the pressure in gas gap with EPS pattern during vacuum pouring is less than 1 a tm.
试验研究了浇注后型腔压力对消失模铸造的铝件表面状态、力学性能影响的趋势。
Influence of pressure applied on the mold after pouring on the surface status and mechanical properties of aluminum castings in lost foam casting is investigated.
适当提高外加压力和浇注温度有助于渗流过程的进行，但过高的浇注温度和压力对渗流过程都是不利的。
The penetrating casting can be promoted by properly increasing the pressure applied and pouring temperature, but disturbed if pouring temperature and the pressure applied were too high.
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