薄壁件加工系统动态响应分析

薄壁件在铣削加工中容易产生共振或变形，直接影响加工稳定性及加工精度。采用主轴-刀具-工件整体铣削系统连续梁模型，系统研究在动态铣削力作用下，刀具端部与工件端部的动态响应之间的相互影响关系以及对整体系统动态响应影响较大的薄壁件尺寸。结果表明，工件横截面高度对系统共振的影响较为明显，当高度尺寸较小时，工件的低频共振会通过动态铣削力直接反映到刀具端部的振动频响上。工件横截面底边宽度尺寸的增大虽然对共振频率的改变不太明显，但会导致激发出来的刀具共振幅度出现明显降低。研究成果可以为薄壁件铣削加工系统的稳定性控制提供理论基础。

Dynamic response analysis of thin wall workpiece processing system

In thin-walled workpiece machining,the resonance and deformation easily occur and directly affect the machining stability and accuracy.This paper adopts the continuous beam for the whole milling system,which includes the spindle,the tool and the workpiece,to study the effects of the dynamic milling force on the relationship between the dynamic responses of the tool end and the workpiece end.The sizes of parts which have significant influences on the dynamic responses of the whole system are studied.It is noted that the sectional height of workpiece has more obvious effects.With small height value,the low frequency resonance of workpiece is directly reflected in the vibration responses of the cutter end through the dynamic milling force.The sectional width dimension changes the resonance frequency slightly,but it reduces the resonance amplitude of the tool end.These results provide a theoretical basis for the stability control of the thin-walled workpiece machining system.