在试验及模拟生产条件下测定了铁水氧电势，并建立了氧电势与铸件皮下气孔之间的关系。
Under the experimental and simulated production conditions, the oxygen potential was measured, and the relation between oxygen potential and pinhole defects were created.
进一步分析球墨铸铁活塞环皮下气孔的形成条件，通过优化主要工艺参数，达到防止皮下气孔的出现。
Through further analyzing the conditions of subsurface blowhole formation and optimizing the technology conditions, the subsurface blowhole defect was eliminated.
前言：对烘缸缸盖在铸造过程中易出现的皮下气孔问题进行了分析，并对缸盖浇注系统的工艺改进作了进一步探讨。
The essay analyzes the problem of blow-hole which is easily seen in the process of production and makes further discussion of the technology of improving lid casting.
对影响球墨铸铁件皮下气孔的各种因素分析表明，铁液中气体的产生有其必然性，通过减少气体的发生量以防止皮下气孔的方法并不是都能奏效。
Discussing various influence factors of ductile iron's surface blowhole defects indicates that bringing various gases in the molten metal or on the interface with the sand mould is inevitable.
对影响球墨铸铁件皮下气孔的各种因素分析表明，铁液中气体的产生有其必然性，通过减少气体的发生量以防止皮下气孔的方法并不是都能奏效。
Discussing various influence factors of ductile iron's surface blowhole defects indicates that bringing various gases in the molten metal or on the interface with the sand mould is inevitable.
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