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通过对消失模铸造阶梯件凝固过程的实时测温,获得铸件的凝固曲线。利用反求原理,基于华铸CAE,对球铁合金铸件进行正交模拟试验,得到铸件模拟降温曲线。选取铸件模拟温度曲线和实际测得的铸件测温曲线的相似度最高的模拟曲线,确定该合金的热物性参数。结果显示,在温度范围为800~1 300℃之间,反求之后的铸件温度曲线与实际温度曲线的相似度较高,误差小于5%。分别利用反求前、后的热物性参数去模拟铸件缺陷并且进行对比分析,反求之后的模拟结果更加符合实际情况,并且通过铸件切片试验得以验证。
Through the real-time temperature measurement of the solidification process of the lost foam casting ladder, the solidification curve of the casting is obtained. Using reverse principle, based on Hua CAE, the orthogonal experiment of ductile iron alloy castings was carried out to obtain the simulated cooling curve of castings. The simulation curve with the highest similarity between the simulated temperature curve of the casting and the actually measured temperature curve of the casting is selected to determine the thermal physical parameter of the alloy. The results show that in the temperature range of 800 ~ 1 300 ℃, the similarity of the casting temperature curve and the actual temperature curve after reverse casting is higher, the error is less than 5%. The thermophysical parameters of the former and the latter were used to simulate the defects of the castings respectively and the comparative analysis was conducted. The simulation results after the inversion were more in line with the actual conditions and verified by the casting slice test.