高速铣削稳定性与表面加工精度研究

Research on Stability and Surface Finish in High-speed Milling Process

考虑高速铣削过程中自激振动和强迫振动的影响,利用半离散估计技术和傅立叶展开理论研究了颤振稳定性极限和表面位置误差的关系。研究结果显示,稳定性好的区域处于系统共振区附近,加工表面误差较大,而稳定性好且加工精度高的区域位于共振区左侧,此区域可以通过表面位置误差图和稳定性极限图确定。研究结果通过铣削试验进行了验证。

Considering the effects of self - excited vibration and forced vibration, based on semi - discretization method and Fourier expansions theory, the chatter stability limits and surface location error （SLE） are investigated. It is shown that the SLE is large at the spindle speeds where the ratio of the dominant fre- quency of the tool and the tooth passing frequency is an integer. And large stable depths of cut with a small SLE can still be attained close to the resonant spindle speeds by using the SLE diagrams associated with stability charts. The results are confirmed experimentally on a high -speed milling center.