Abstract
In order to study the mechanics of machining chatter, an investigation into the dynamics of metal cutting process has been carried out using experimental approaches. In this paper, turning experiments are carried out to evaluate the effect of tool wear on the dynamic stiffness of metal cutting process, employing the tool attached to a cantilever-type structure which is excited sinusoidally in the direction of its principal mode. The experimental results are shown to agree with the theoretical model including the effect of the dynamic force which acts on the flank wear land. The results obtained are as follows. (1) When the tool vibrates in the normal direction to the cut surface, the damping effect is induced which depends on the width of flank wear land and the wave length of chatter marks. (2) When the worn tool vibrates in the parallel direction to the cut surface, the negative damping effect is induced if the frequency of the tool vibration is over 1 000 Hz.
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