切削時自励振動の挙動と位相特性について

Behavior of the self-excited chatter in cutting was investigated from the view point of space phase, which is the one observed between outer and inter modulation. A data acquisition and analysis system using personal computers was developed, which is possible to store vast amount of digitized signal and to process these. Records of oscillation for the horizontal motion of the work and that for the horizontal component of the cutting force were stored. For the variation of the rotational speed it was newly found that the amplitude of the vibration increases for decreasing rotational speed and vice versa, and the amplitude of the cutting force does not increase as that of the work does. Amplified and damped amplitudes for the decreasing and increasing rotational speed are shown closely related with decreasing and increasing space phase. The rather constant cutting force inspite of the variation of the work displacement shows good correlation with the cutting area given by the difference of the successive displacement.