Abstract
In turning by engine lathe, it is empirically known that chatter vibration may be suppressed when the cutting tool is mounted upside down on the tool post (hereinafter, this method called ‘upside-down tool mounting method’). This study discusses the suppression mechanism of chatter vibration of this tool mounting in terms of the tool vibration trajectory such as vibration direction and amplitude. Because the translational motion in the height direction of the tool is dominant in upside-down tool mounting, the vibration in the tool axis direction is reduced compared to that of usual tool mounting. The effect suppresses chatter vibration in upside-down tool mounting method. Then, tool shank structures for the normal cutting operations were designed to demonstrate the similar tool vibration trajectory to the cutting opetation with the upside-down tool mounting. A parallel leaf spring structure promotes the translational component in the tool height direction to reduce the chatter vibration. The chatter vibration largely depends on the tool vibration trajectory as well as modal paramters of tool clamping.
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