ABSTRACT In recent years, the development of computational models to predict casting distortions has led to improvements in efficiency and accuracy over traditional pattern design that relies on shrink rules. Unfortunately, the determination of pattern dimensions using computer simulation remains a trial-and-error process that requires several design iterations. In this study, the finite element inverse deformation analysis is utilized to calculate the pattern geometry in a single iteration for a plastically deformed (i.e., distorted) body. This method is evaluated through a loop test, for which an inverse simulation is performed first to calculate the pattern shape. This configuration is then used as the input geometry for a forward simulation, which is shown to successfully recover the original as-cast shape used for the inverse analysis. Through this sequence, the inverse deformation method is shown to be a viable technique for the determination of pattern allowances in production castings.

中文翻译：

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使用有限元逆变形分析确定铸钢件的图案余量

摘要 近年来，与依赖收缩规则的传统模型设计相比，预测铸造变形的计算模型的发展提高了效率和准确性。不幸的是，使用计算机模拟确定图案尺寸仍然是一个需要多次设计迭代的试错过程。在这项研究中，有限元逆变形分析用于计算塑性变形（即扭曲）体的单次迭代中的图案几何形状。该方法通过循环测试进行评估，首先进行逆向模拟以计算图案形状。然后将此配置用作正向模拟的输入几何形状，显示成功恢复用于逆向分析的原始铸态形状。