The defects of HOWO tank made with top gating system and inclined-pouring process were analyzed, and some improving measurements were put forward. The trial production result shows that the step gating system is more suitable for batch production. With this process the defects such as slag, gas-hole and porosity can be effectively eliminated, and qualified products can be produced. The improved technology scheme has been successfully used in production of other tens types of thin wall tanks.%针对汽车空调HOWO气室铸件在采用顶注浇注系统、可倾转重力铸造时产生的缺陷,分析了缺陷产生原因,提出了改进方案.通过试生产的结果表明,采用阶梯式浇注系统作为批生产的工艺,可以大大减少汽车空调某气室铸件内夹渣、气孔和缩松的缺陷,提高了铸件的合格率.改进后的工艺方案已成功地应用到其他数十类气室类薄壁铸件的生产中.
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