薄壁结构件铣削加工振动稳定性分析

针对如何考虑刀具与工件相互耦合作用及加工位置对系统稳定性影响，通过对切屑厚度、铣削力建模，建立薄壁件铣削系统动力学模型，考虑薄壁件铣削稳定性受铣削位置影响，获得以轴向铣削深度、转速、铣削加工位置为参数的三维稳定性图。通过对曲面图分析，可确定在不同主轴转速、不同铣削区域内薄壁件各模态对铣削稳定性影响。通过时域模拟分析加工位置对系统失稳机制影响，揭示稳定铣削与不稳定铣削、不同模态在不稳定铣削时铣削力、铣削位移的变化规律。

Stability analysis for thin-walled milling processes

For the milling with thin-walled structure, the effect of interaction between workpiece and tool and the position depended stiffness of workpiece can’t be ignored. It is a challenge work to determine the stability lobes. In this thesis, the model of the milling force and chip thickness is derived and then the governing equations of motion of the dynamic system are presented. A time-domain simulation isused to investigate the stability and three dimensions stability surface are obtained in the space of spindle speed, cutting position, and axial depth of cut. The effects of modal on the stability of milling processes are position and spindle speed depended are discussed and the position dependent mechanism of loss of stability are pointed.