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Numerical Simulation of Green Sand Squeeze Molding Using Three-Dimensional Distinct Element Method

机译：三维离散元法对湿砂挤压成型的数值模拟

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摘要

A three-dimensional simulation model for green sand molding was developed using Distinct Element Method (DEM) in the present study. The characteristics of bonded sand such as sand shape and particle distribution were expressed by the Hard-Core/Soft-Shell model. Contact force and gravitational force moved individual particles. The present model was applied to squeeze molding. Laboratory experiments were carried out to test the validity of the model. Furthermore, two- and three-dimensional simulation using uniformed elements were carried out to compare the compaction behavior. Results of the experiment and simulation clarified the relationship between the void fraction and squeeze pressure during molding. The effects of particle size distribution on sand compaction behavior were also clarified. Mold properties obtained by simulation using non-uniform elements more or less agreed with those by experiments.
机译：在本研究中，使用离散元方法（DEM）建立了用于生砂造型的三维仿真模型。用Hard-Core / Soft-Shell模型表达了结合砂的特征，例如砂的形状和颗粒分布。接触力和重力移动单个粒子。本模型被应用于挤压成型。进行了实验室实验以检验该模型的有效性。此外，进行了使用均匀单元的二维和三维模拟，以比较压实性能。实验和模拟结果澄清了成型期间空隙率和挤压压力之间的关系。粒度分布对压实行为的影响也得到了澄清。通过使用不均匀元素进行仿真获得的模具性能与实验中的性能基本一致。

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