考虑不同铣刀结构微细立铣削时域仿真的研究

摘要

微细铣削是使用立铣刀在高转速下制造三维零件的一种加工方式，在微细立铣削加工过程中分析切削力和刀尖位移对表征切削过程、提高刀具寿命和优化加工参数有着非常重要的作用。为选择铣削过程合适的切削参数，提出一种预测切削力和刀尖位移的时域仿真方法。提出了动态切削厚度、动态切削力和位移的表示方法，并建立了相应的方程表达式；通过模态试验的方法得到了机床-刀具系统的频率响应函数；在此基础上针对直齿和螺旋齿2种铣刀结构，进行了详细的时域仿真试验，预测了铣削加工过程中的切削力和位移，仿真结果对实际加工有重要的指导意义。%Micro mil ing utilizes micro end mil to fabricate complex 3D parts at high rotational speeds.The analysis of cutting force and displacement in micro end mil ing plays an important role in characterizing the cutting process,estimating the tool life and optimizing the process.In this paper,a time-domain simulation that predicts forces and displacements during mil ing for se-lected operating parameters is proposed.The expressions of dynamic cutting thickness,cutting force and displacement are developed,and the relevant equations are constructed.This is fol-lowed by a detailed time-domain simulation for micro end mil ing with straight teeth and helical teeth end mil based on the machine-tool system frequency response function obtained through modal testing,the forces and displacements are predicted.The simulation results have important significance for the actual mil ing process.