鋳造工学
Online ISSN : 2185-5374
Print ISSN : 1342-0429
ISSN-L : 1342-0429
研究論文
アルミニウム合金ダイカストのガス欠陥を低減するオーバーフロー自動設計システムの開発
南出 大地高木 優斗矢野 賢一中村 直人佐野 公大青木 崇浩
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2022 年 94 巻 8 号 p. 456-464

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  In die casting, since the air inside the shot sleeve and the mold affects product quality, discharging the gas out of the mold is an important process. When designing exhaust systems such as exhaust runners or overflows, it is necessary to discharge the molten metal with gas entrained outside the mold as much as possible. Overflows can be installed over a wider range than exhaust runners, allowing discharge of molten metal with entrained gas that cannot be discharged with exhaust runners. Therefore, it is important to take into account the overflow position and volume. In recent years, researches have been conducted on the optimal overflow position by combining optimization theory and CFD, but optimization of the overflow position only causes gas entrapment in the product and excessive discharge of molten metal due to excess/insufficient overflow volume. In addition, if the entire mold area is analyzed, the calculation will take considerable time, making it difficult to apply this method to the design of an exhaust system that meets our research target. This research proposes an optimal design system that automatically designs the optimal overflow position and volume for completely discharging molten metal with gas entrained in products by estimating the molten metal flow direction during filling. Finally, the effectiveness of the proposed method was verified through CFD including the proposed overflow.

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