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Numerical analysis of air-flow press molding using distinct element method

机译：气流压铸成型的离散元数值分析

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Recently, the green sand molding process by means of the air-flow + squeeze (flask type) is being used. In this study, the air-flow stage is investigated. It is essential to know how sand particles are moved by air pressure. Numerous experimentalstudies have been conducted, but none have clarified the behavior of sand particles, nor optimized the molding process. The purpose of this study is to develop a process model using the distinct element method (DEM). In this model, the individualparticles are moved by three forces, namely, contact force, drag force and gravitational force. Numerical simulation was performed to predict the behavior of the sand particles during the air-flow stage, and laboratory experiments were carried out toexamine the calculated results. From the simulation, contact force, drag force and inertia force of individual particles were obtained as the function of time. The inlet air velocity was seen to affect the phenomena of molding sand compaction. This studyapplying DEM, produced useful information such as the effective molding parameters for the optimization of the air-flow process.
机译：近来，正在使用通过气流+挤压（瓶型）的生砂造型工艺。在这项研究中，对气流阶段进行了研究。必须了解砂粒如何通过气压移动。已经进行了许多实验研究，但是都没有弄清砂粒的行为，也没有优化成型过程。本研究的目的是使用独特元素方法（DEM）开发过程模型。在此模型中，单个粒子通过三个力（即接触力，阻力和重力）移动。进行了数值模拟，以预测砂粒在气流阶段的行为，并进行了室内实验以检查计算结果。通过仿真，获得了各个颗粒的接触力，拖曳力和惯性力，它们是时间的函数。可以看出进气速度会影响型砂的压实现象。这项应用DEM的研究产生了有用的信息，例如用于优化气流过程的有效成型参数。

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