Abstract
Large length-diameter ratios in boring bars of weak rigidity cause chatter vibration of the cutting system during the boring process. Stability lobes are widely used for analyzing and describing the stability of cutting systems. To decrease the possibility of chatter and improve efficiency and surface quality in boring deep holes, a method of calculating the stability lobes for boring with three degrees of freedom (3-DOF) is proposed, which considers both regenerative chatter and modal-coupling chatter. Based on the classical cutting force model and 3-DOF equations of motion, the relationship between the dynamic cutting forces and displacements was deduced using a cutting force model and the geometric relationship between cutting thickness and displacement. The stability lobes of a boring bar with holes were analyzed and the results verified the effectiveness of the proposed calculation method.
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