Correlation between Idle Time Vibration of Machine Tool and Machining Chatter

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  • 工作機械における空転時の振動と切削時のびびりの関連性
  • コウサク キカイ ニ オケル クウテンジ ノ シンドウ ト セッサクジノビビリ ノ カンレンセイ

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Mechanism of the machining chatter caused by the forced vibration on a machine tool is presented with the metal cutting test results which ascertain the prediction through the theory. From the presently conceived theory of self-excited chatter, a theory of forced chatter has been derived. According to the theory, the magnification ratio of the chatter amplitude to the amplitude of the idle time forced vibration is predicted from the transfer function of the machine structure, the cutting condition, and the frequency of the forced vibration. The result of turning tests performed with the forced vibration applied by a magnet exciter clarifies that the magnification ratio varies according to the forcing frequency in the way as predicted by the theory. From the theory and the experiment of this study, it is understood that there exist some particular sets of conditions where very high magnification ratios are attained although the ratio is not greater than unity except at these conditions. The forcing frequency above the resonance frequency but in the resonance range is particularly unfavorable due to the generation of the forced chatter.

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