Based on the formation mechanism of penetration, the reason causing penetration defects of V-process castings was analyzed with considering the features of vacuummoulding process.
结合铸件粘砂机理，从V法铸造的成型特征上分析V法铸造铸件的粘砂原因。
2
The vacuum squeeze moulding technique is a new technology for compacting moulding sand.
真空压实造型技术，是一种新的型砂紧实工艺。
3
The moulding of the case utilizes the technology of full-vacuum braze welding for satisfying the sealing requirement.