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要确保稀土镁球铁铸件的致密性,在确定浇冒口时,除了必须明了灰口铸铁的一般凝固特性和铸造性能外,还要了解稀土镁球铁凝固,收缩和石墨化特点,采用顺序(或同时)凝固的工艺原则。由于化学成分,浇注温度,铸型等因素影响,稀土镁球铁的缩松、缩孔倾向较灰口铸铁件大(表1),因此,须安放冒口、冷铁来消除收缩缺陷。对某些不便使用冒
To ensure the compactness of rare earth magnesium cast iron castings, in determining the riser, in addition to the general solidification properties of gray cast iron must be clear and casting performance, but also understand the rare earth magnesium iron coagulation, shrinkage and graphitization characteristics, in order (Or at the same time) the principle of solidification process. Due to the chemical composition, pouring temperature, mold and other factors, the shrinkage and shrinkage of rare earth magnesium nodules tend to be larger than that of gray cast iron (Table 1). Therefore, risers and cold irons should be installed to eliminate shrinkage defects. Use for some inconveniences