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本文采用数字仿真技术分析研究了速度型切削颤振系统的非稳定状态与颤振状态,内容包括起振阈与消振阈的分离、有限振幅不稳定性、系统参数对稳态颤振状态的影响。结果表明,起振阈与消振阈的分离现象是由切削宽度的连续变化引起的;有限振幅不稳定性与动态切削力中的三次项阻尼系数有关;动态切削力系数与机床结构系统参数对稳态颤振状态均有影响。
In this paper, we analyze the unsteady state and flutter state of the speed-typed chatter system by using digital simulation technology, including the separation of the start-up threshold and the extinction threshold, the instability of the finite amplitude and the influence of the system parameters on the steady-state flutter state influences. The results show that the separation between the starting vibration threshold and the vibration damping threshold is caused by the continuous variation of the cutting width. The finite amplitude instability is related to the cubic term damping coefficient in the dynamic cutting force. The relationship between the dynamic cutting force coefficient and the machine tool system parameters Both steady-state flutter conditions have an effect.