| Summary: | 碩士 === 逢甲大學 === 機械與電腦輔助工程學系 === 106 === The objective of this study is to investigate the effects of physical properties on the mold filling and solidification process using CAE Software, JS-CAST. Gating system for flake graphite cast iron(FC350) and spheroidal graphite cast iron (FCD450-10)are chosen as the research targets. The method adopted for studying mold filling and solidification of casting is as followed. First, obtain the total cross-sectional area of the gate. Then choose a suitable gating ratio to design a gating system. Finally, modify the physical properties’ settings (specific heat, thermal conductivity, initial temperature, solid and liquid phase temperature) within the JS-CAST simulation software to simulate and analyze the mold filling and solidification process of casting.
It is observed that physical properties of the casting have the maximum effect on the maximum and minimum temperature difference for the filling process. Comparing with the original settings, specific heat and thermal conductivity have shown the most obvious effects on the temperature difference.
It is observed from the solidification rate curve that the required solidification time is significantly reduced by reducing the specific heat and the initial temperature, but reducing the thermal conductivity has the opposite effect. It is also observed from the curve of temperature variation, the required cooling time is significantly reduced by reducing the settings of specific heat and the initial temperature value when the required cooling temperature is below the eutectoid point, but reducing the thermal conductivity has the opposite effect.
When changed specific heat, thermal conductivity, and initial temperature at the same time to compare the effect. It is observed that specific heat has shown the most obvious effects on the minimum of the filling temperature, attain 100% solidification rate, and the cooling time required when the temperature is below the eutectoid point.
It is also observed that modify the physical properties’ settings haven’t shown obvious effects on the simulation results of Niyama criterion (index of shrinkage defect).
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