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Extension of SPH to predict feeding, freezing and defect creation in low pressure die casting

机译:扩展SPH以预测低压压铸件的进料,冻结和缺陷产生

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Low pressure die casting is used to manufacture complex metal components where there is a need for high structural integrity. In this process, liquid metal is fed from below into the die used to form the component under a positive pressure. Smoothed particle hydrodynamics (SPH) is a meshfree Lagrangian method that has specific advantages for modelling such material forming applications. This paper describes extensions to the SPH method for predicting shrinkage of the cooling metal, tracking of oxide formation, prediction of feeding, solidification front dynamics and finally direct prediction of the residual pressure distribution in the solidified metal and of cavity defect formation. These are demonstrated using a simple two dimensional example which contains the essential features of an engine block.
机译:低压压铸用于制造需要高结构完整性的复杂金属部件。在此过程中,液态金属从下方送入用于在正压下形成零件的模具中。平滑粒子流体动力学(SPH)是无网格的拉格朗日方法,具有对此类材料成型应用程序进行建模的特定优势。本文介绍了SPH方法的扩展,该方法可用于预测冷却金属的收缩,跟踪氧化物的形成,预测进料,凝固前沿动力学,最后直接预测凝固金属中的残余压力分布以及腔缺陷的形成。这些将通过一个简单的二维示例进行演示,其中包含发动机缸体的基本特征。

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