在实际生产中，薄壁铸铁件顶部常常产生气孔、空洞等缺陷。分析了这些缺陷产生的原因。结果表明，这些铸造缺陷是由于浇注时伴有呛火以及浇注系统和冒口处排渣、挡渣效果差所致。采用3D铸造技术和改进的浇注系统及冒口设计，减少甚至防止了薄壁铸铁件顶部缺陷的产生。%In actual production, some defects such as gas hole, cavity and so on often occur at top of thin-wall iron castings. The reasons for this fact were analyzed. The results indicate that these pouring defects are ascribed to chock during the pouring as well as to bad both slag tipping and slag stopping in pouring system and in riser. The top defects of the thin-wall iron castings have been reduced, even eliminated by both the use of 3D casting technology and improvement in design of the pouring system and the riser.
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