轴向车铣薄壁回转体的动力学分析

Dynamics Analysis of the Thin-Wall Rotors Machining by Axial Turn-Milling

根据弹性体动力学理论,建立轴向车铣加工薄壁回转体的动力学模型,得到了各阶固有频率和主振型的计算公式,分析了在简谐激励下薄壁回转体强迫振动的动力学响应。利用ANSYS对ZL101薄壁回转体的轴向车铣加工进行了模态分析和谐响应分析,得到了振动峰值的频率和幅值,且与理论计算的结果一致。研究结果表明,在薄壁回转体的轴向车铣加工中,合理选择铣刀转速和齿数,可使切削力频率避开共振区间,有利于得到更好的表面质量。

According to elastodynamics theory, the dynamic model of machining the thin-wall rotors by axial turn-milling is founded, and the calculation formula of natural frequencies and fundamental mode are obtained, and the dynamic response of forced vibration on the thin-wall rotors is studied under simple harmonic excitation. On the basis of ANSYS,the modal analysis and harmonic response analysis for the ZL101 thin-wall rotors machining by the axial turn-milling is carried out,and the thin-wall rotors of vibration frequency and amplitude of the peak are obtained,and they are consistent with the results of theoretical calculations. It is shown that cutting force can avoid resonance frequency range by reasonable choice on cutter rotate speed and tooth number,it is propitious to obtaining better surface quality.