Effect of sand mold models on the simulated mold restraint force and the contraction of the casting during cooling in green sand molds

Yuki Inoue*, Yuichi Motoyama, Hiroki Takahashi, Keita Shinji, Makoto Yoshida

*この研究の対応する著者

研究成果: Article査読

15 被引用数 (Scopus)

抄録

In this work, the JIS AD12.1 (almost the same as A383.1) aluminum alloy was cast in a green sand mold. The restraint force from the sand mold and the contraction of the casting were measured dynamically from the solidifying temperature to the shake-out temperature using a dedicated device. Then, FEM (Finite Element Method) thermal stress analyses of the experiment were performed. The analyses adopted four types of representative constitutive equations and the mechanical properties of the green sand mold, which were quoted from previous research articles. As verification, this study dynamically compared the simulated restraint force and the contraction of casting with measured results and examined which mechanical properties are important for expressing the restraint force of the sand mold. This verification is the first attempt in the world. As a result, the simulated restraint force was estimated to be over ten times as large as the measured result in each type of equation because the yield stress of the sand mold used in our experiment was lower than those quoted from previous studies. The yield stress measured by a uniaxial compression test was 1/20 of the quoted values. When the measured yield stress was adopted in the simulation, the simulated restraint force and contraction approached the measured results. The yield stress of the sand mold was a dominant factor in the restraint force simulated by the thermal stress analyses. The yield stress of the green sand mold used in the casting process should be measured to predict the residual stress using FEM thermal stress analyses.

本文言語English
ページ(範囲)1157-1165
ページ数9
ジャーナルJournal of Materials Processing Technology
213
7
DOI
出版ステータスPublished - 2013

ASJC Scopus subject areas

  • セラミックおよび複合材料
  • コンピュータ サイエンスの応用
  • 金属および合金
  • 産業および生産工学

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