Geometric Physically-Based and Numerical Simulation of NC-Grinding Processes for the Calculation of Process Forces
Geometric Physically-Based and Numerical Simulation of NC-Grinding Processes for the Calculation of Process Forces
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DOI：
10.1016/j.procir.2020.01.022
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
F. Wöste;T. Siebrecht;M. Fast;P. Wiederkehr
中科院分区：
文献类型：
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作者：
F. Wöste;T. Siebrecht;M. Fast;P. Wiederkehr
磨削工艺产生的表面形貌和相应的工艺力取决于各种工艺条件，例如晶粒形状和工件材料。基于几何物理的模拟可用于分析这些过程结果，同时考虑磨削工具上的各个颗粒。然而，力模型的实验校准既耗时又具有挑战性，因为颗粒的形状会因磨损而发生变化。有限元分析 (FEA) 可用于根据材料模型（例如 Johnson-Cook (JC) 模型）计算具有定义的晶粒形状的单个晶粒啮合的过程力。本文采用耦合欧拉-拉格朗日（CEL）方法来确定基于几何物理的模拟系统的经验力模型的切削力系数。工件模型由欧拉公式描述，颗粒被建模为包含三角形元素的刚性外壳。将校准的力模型应用于示例性研磨过程的模拟中，以便计算每个单独颗粒的过程力。通过将模拟结果与实验研究进行比较来验证模拟力。
Surface topographies resulting from grinding processes and the corresponding process forces depend on various process conditions, such as the grain shapes and the workpiece material. Geometric physically-based simulations can be used to analyze these process results, taking the individual grains on the grinding tool into account. However, the experimental calibration of the force models is time consuming and challenging since the shape of the grains changes due to wear. Finite Element Analysis (FEA) can be used to calculate the process forces of individual grain engagements with defined grain shapes based on material models, e.g., the Johnson-Cook (JC) model. In this paper, the Coupled Eulerian-Lagrangian (CEL) method is used to determine the cutting force coefficients of the empirical force model of a geometric physically-based simulation system. The workpiece model is described by an Eulerian formulation and the grain is modeled as a rigid hull comprising triangular elements. The calibrated force model is applied in a simulation of an exemplary grinding process in order to calculate the process forces for each individual grain. The simulated forces are validated by comparing the simulation results to experimental investigations.