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<p>The expansion and contraction behavior of spheroidal graphite cast iron as it solidifies and the characteristics of silica sand, artificial sand, raw molds, and permanent molds were organized to improve the prediction accuracy of the shrinkage porosity. The expansion and contraction behavior during solidification was based on the method considered in the authors' previous research (Miyamoto in AFST, 2009. <a href="https://doi.org/10.1007/s40962-025-01588-6">https://doi.org/10.1007/s40962-025-01588-6</a>). Mold characteristics, mold strength, thermal expansion coefficient of casting sand, and dimensions of castings were investigated, and the effects of mold movement during solidification on the amount of expansion and shrinkage were discussed. Based on the results, the expansion and contraction behaviors were calculated considering the mold characteristics, and shrinkage porosity was predicted by casting simulation. The resulting shrinkage cavity distribution was close to that of actual castings, and the possibility of improving shrinkage cavity prediction was found.</p>

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Improved Prediction of Shrinkage Defects in SGI Castings Considering Expansion/Contraction Behavior and Mold Characteristics

  • 期刊论文

  • 发表日期：

    2025年6月30日

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  • Yutaka Miyamoto,
  • Jun Sasaki,
  • Takeshi Nakano,
  • Haruki Itofuji

摘要

The expansion and contraction behavior of spheroidal graphite cast iron as it solidifies and the characteristics of silica sand, artificial sand, raw molds, and permanent molds were organized to improve the prediction accuracy of the shrinkage porosity. The expansion and contraction behavior during solidification was based on the method considered in the authors' previous research (Miyamoto in AFST, 2009. https://doi.org/10.1007/s40962-025-01588-6). Mold characteristics, mold strength, thermal expansion coefficient of casting sand, and dimensions of castings were investigated, and the effects of mold movement during solidification on the amount of expansion and shrinkage were discussed. Based on the results, the expansion and contraction behaviors were calculated considering the mold characteristics, and shrinkage porosity was predicted by casting simulation. The resulting shrinkage cavity distribution was close to that of actual castings, and the possibility of improving shrinkage cavity prediction was found.