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基于离散单元法-计算流体动力学方法的量纲分析的线性模具填充建模

Modeling of Linear Die Filling Based on Dimensional Analysis Using DEM-CFD Methods.

作者信息

Li Jie, Zhou Sunsheng, Yan Shiyan, Tan Yuanqiang, Zhang Jiangtao

机构信息

Institute of Manufacturing Engineering, Huaqiao University, Xiamen 361021, China.

National & Local Joint Engineering Research Center for Intelligent Manufacturing Technology of Brittle Material Products, Huaqiao University, Xiamen 361021, China.

出版信息

Materials (Basel). 2025 Jul 10;18(14):3261. doi: 10.3390/ma18143261.

DOI:10.3390/ma18143261
PMID:40731471
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12298435/
Abstract

Linear die filling is currently widely employed in industries. However, there is no comprehensive and systematic model to describe the powder die filling process. This paper utilizes dimensional analysis to extract and analyze various factors that affect the flow characteristics of powder based on DEM-CFD simulations. Several dimensionless parameters including the ratio of particle size to die depth (dphD-1), solid density number (ρpρg-1), shoe speed number (vρgLDμ-1), and force number (GpFDrag-1) were proposed based on the Pi theorem. The results showed that the filling ratio δ increased with the increase in dphD-1 and ρpρg-1 due to GpFDrag-1 rising. But it decreased with the increase in vρgLDμ-1 due to the shortening of effective filling time. Finally, a semi-empirical modeling of linear die filling was developed, taking the critical value (dphD-1)90 as the dependent variable and the solid density number (ρpρg-1) and shoe speed number (vρgLDμ-1) as independent variables. Hence, this model provides a new approach to computing the smallest shoe speed and designing the sizes of dies based on measurable material properties under complete die filling.

摘要

线性模具填充目前在工业中广泛应用。然而,尚无全面系统的模型来描述粉末模具填充过程。本文基于离散元-计算流体动力学(DEM-CFD)模拟,利用量纲分析来提取和分析影响粉末流动特性的各种因素。基于π定理,提出了几个无量纲参数,包括粒径与模具深度之比(dphD-1)、固体密度数(ρpρg-1)、靴速数(vρgLDμ-1)和力数(GpFDrag-1)。结果表明,由于GpFDrag-1上升,填充率δ随dphD-1和ρpρg-1的增加而增加。但由于有效填充时间缩短,δ随vρgLDμ-1的增加而降低。最后,建立了线性模具填充的半经验模型,以临界值(dphD-1)90作为因变量,固体密度数(ρpρg-1)和靴速数(vρgLDμ-1)作为自变量。因此,该模型为在完全模具填充情况下基于可测量的材料特性计算最小靴速和设计模具尺寸提供了一种新方法。

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