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四、再生型自激振动的稳定性简要地分析了切削过程动态特性和机床结构动态特性以后,把两者联系起来就可以进行切削稳定性分析。当重叠系数μ=1时,这两者的关系如图2—13所示。当切削宽度为较小的b_1时,实际切削动柔度曲线W_(CFy_1)远离机床实际动柔度曲线W_(MFy)。这时,对于机床实际动柔度来说,单位力所产生的振动位移反馈于切削过程,由于|W_(CFy_1)|>|W_(MFy)|,不能再产生此单位动态力,因此,不可能发生自激振动。当切削宽度增加到
Fourth, the stability of regenerative self-excited vibration After a brief analysis of the dynamic characteristics of the cutting process and dynamic characteristics of the machine tool structure, the two can be linked to the cutting stability analysis. When the overlap coefficient μ = 1, the relationship between the two is shown in Figure 2-13. When the cutting width is smaller b_1, the actual cutting flexible curve W_ (CFy_1) is far away from the machine actual flexible curve W_ (MFy). At this time, for the actual machine flexibility, the vibration displacement generated by the unit force is fed back to the cutting process. Because | W_ (CFy_1) |> | W_ (MFy) |, this unit dynamic force can no longer be generated. Self-excited vibration may occur. When cutting width increases to