An updated tuning methodology of vibration absorber for machining chatter suppression

Abstract

The Equal Real Troughs optimization criterion of vibration absorber improves unconditionally stable cutting depth of single-dimensional chatter vibration. However, the stability pockets within the lobes are decreased after tuning, which therefore causes the machining efficiency reduction at certain spindle speed. Noting that the spindle speed is preferred as a constant in the workshop once the assembly of machine tool/cutter/workpiece are determined, an updated optimization methodology is proposed to maximize the critical cutting depth within specified spindle speed range by utilizing the lobing effect. The optimization routine is formulated based on the boundary identification of stability lobe diagram (SLD), which is derived by the Zero-Order Analytical (ZOA) solution. The tuning methodology is validated on the design of vibration absorber in order to raise the machining stability of slender milling/turning cutter with large length-diameter ratio. The updated methodology enables the stability lobes relocation of single/two-dimensional chatter vibration for achieving higher critical cutting depth at specified spindle speed, and assures the stability width assignable considering the robustness of cutting parameter selection.