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不锈钢叶轮的形状复杂且壁薄,使熔模铸造不锈钢叶轮铸件出现缩孔缩松及浇不足等缺陷。这些缺陷与铸件的充型和凝固过程密切相关。本文使用ProCast软件数值模拟研究叶轮的充型及凝固过程,并将结果与实验进行了比较。结果表明:浇注温度为1550℃、浇注速度为0.75 m/s有利于叶轮铸件的充填,可避免浇不足缺陷。适当的铸造温度和铸造速度仍无法避免在叶轮铸件内产生缩孔缩松缺陷。根据叶轮铸件的结构特点,采用在叶轮铸件中空处施加冷铁的方式可以消除铸件中的缩孔缩松缺陷,当冷铁高度为叶轮铸件内部高度的1/3时,去除缩松缩孔缺陷的效果最明显。
The shape of the stainless steel impeller is complex and the wall is thin, so that defects such as shrinkage shrinkage and insufficient pouring of the investment casting stainless steel impeller casting occur. These defects and casting filling and solidification process are closely related. In this paper, the numerical simulation of ProCast software was used to study the filling and solidification process of impeller, and the results were compared with the experiment. The results show that the pouring temperature is 1550 ℃ and the pouring speed is 0.75 m / s, which is good for filling the impeller castings and can avoid the insufficient pouring defects. Appropriate casting temperature and casting speed still can not avoid shrinkage defects in the impeller castings. According to the structural characteristics of the impeller casting, the method of applying chilled iron in the hollow of the impeller casting can eliminate the shrinkage shrinkage defects in the casting. When the chill height is 1/3 of the internal height of the impeller casting, the shrinkage shrinkage defect is removed The most obvious effect.