Abstract
The cutting limit of stability can be increased by using a boring bar with a non-circular cross section. This fact has been reported by J.Tlusty, L.K. Kuchma, and S.Kato-E.Marui. Among these analytical or experimental reports, there seems to be no coincidence in the most effective orientation angle between cutting edge and minimum direction of boring bar stiffness. In this paper, many factors affecting the cutting limit of stability, that is, cutting conditions, time lag of cutting force to chip thickness fluctuation, shaft rigidity, asymmetry of stiffness, natural frequency, damping coefficient and angular velocity of shaft are investigated. Consequently, it is verified that three reports above mentioned coincide with the special cases of certain factors combined. The obtained results in this paper may be applied no only to the vibrationproof problems of boring bar, planer-tool, shaper-tool, lathe-tool, but also to those of workpiece set on lathe spindle.
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