使用光滑颗粒流体力学模拟垂直切割过程

摘要

在过去的几十年中，无网格法广泛应用于模拟多种机械加工中的切削过程，因为此方法可以避免在模拟材料失效或者大塑性变形过程中的数学问题。本文主要内容是使用光滑颗粒流体力学（SPH）方法模拟正交切削AISI 1045钢，并对其结果进行了分析。而且确定了SPH求解程序的一些参数，例如：初始光滑长度、初始颗粒密度、时间步长增长系数等是怎么样影响预测切削力和薄片压缩比值得的误差。SPH求解程序参数的最优值是由求一个目标函数的最小值得到的。加工变量的估计误差和计算时间在初始颗粒密度为40μm，时间步长增长系数为0.4时达到最佳平衡状态。%In the last decades,mesh-free methods forsimulating various cutting processes have been used verywidely as they can eliminate numerical problems in thesimulation of material failure and large plastic deformations.This paper deals with the results from modelling theorthogonal cutting of AISI 1045 steel using smoothedparticle hydrodynamics(SPH)method. Moreover,it isdetermined how the parameters of the SPH solver such asinitial smoothing length,initial particle density and coefficientfor the timestep increase affect the prediction errorfor the values of cutting force and chip compression ratioas well as computing time. The optimum values of the SPHsolver parameters are determined by minimising anobjective function. The best balance between the predictionerror of machining variables and computing time isachieved for an initial particle density of 40 lm and acoefficient for the timestep increase of 0.4.