基于MAGMA的球墨铸铁铸造工艺裕度分析

Study on Process Tolerance of Ductile Iron Based on MAGMA

基于MAGMA的模拟计算,研究40 mm×200 mm×100 mm试块在不同浇注温度、砂型刚度、孕育和石墨析出的条件下缩松行为。模拟研究表明:石墨析出率和孕育效果变化对铸件缩松形成有明显影响,浇注温度变化对铸件缩松的形成影响较小,即石墨析出和孕育方式的工艺裕度小,浇注温度的工艺裕度较大,这与试验结果基本一致;MAGMA对砂型刚度对铸件缩松形成影响的模拟结果与试验不符。

The formation of porosity in 40 mm×200 mm×100 mm ductile iron test block under the conditions of different pouring temperature, mold dilation, inoculation and graphite precipitation were investigated on the basis of MAGMA software. The results show that the variations of inoculation and graphite precipitation have distinct influence on the formation of porosity in ductile iron and the pouring temperature changes have slight influence on the formation of porosity in ductile iron, namely, the process tolerances of graphite precipitation and inoculation are small and the pouring temperature＇ s process tolerance is bigger, which are in accord with the experimental results. The MAGMA simulation results about effect of the mold dilation on the formation of porosity in ductile iron were inconsistent with the experimental results.