瞬时铣削力建模与铣削力系数的粒子群法辨识

摘要

To obtain an accurate instantaneous milling force model, milling force of element edge is analyzed,and a model is established, Ac cording to the characteristics of end-milling, a method is proposed to judge whether an element milling edge is milling or not, and a specific formula is given.On the basis, an instantaneous milling force model for end-milling is developed including the shear effect and plough effect. Taking into account the PSO algorithm advantages of fast convergence, a coefficient identification method based on the algorithm for milling force is presented.Also ,the implementation steps are given.Milling test results show that the method can identify the milling force coefficient accurately.Predicted values using the proposed instantaneous milling force model are almost the same as measured values.%为获得精确的瞬时铣削力模型,对微元铣削力进行分析,建立了微元铣削力模型.依据立铣加工的特点,提出了微元铣削刃参与铣削的判断方法,给出了具体的计算公式.在此基础上,建立了包含剪切效应和犁入效应的瞬时铣削力模型.利用粒子群算法收敛速度快的优点,提出了基于粒子群的单位铣削力系数辨识方法,给出了算法的实现步骤.铣削试验结果表明,该方法能够精确辨识出单位铣削力系数,利用所提出的瞬时铣削力模型获得的铣削力预测值与铣削力实测值的大小和变化趋势基本一致.