Abstract
Suppression effect of multiple dynamic absorbers on chatter in end milling process is investigated. Stability analysis with a simple analytical model is conducted to clarify the relationships between chatter-free depth of cut, spindle speed, tuning parameters (natural frequencies and damping ratios) and total number of dynamic absorbers. First, the suppression effect is examined for the case which all dynamic absorbers are tuned to an identical parameter. The tuning parameters with the largest suppression effect are determined for spindle speeds at the local minimal and the local maximal values on the stability lobe of chatter without dynamic absorbers. It is shown that the influence of the changes of the tuning parameters on the suppression effect varies according to spindle speed. The asymptotic borderline of stability and the maximal axial depth of cut are improved substantially with dynamic absorbers tuned to the derived parameters. Next, the suppression effect is discussed for the case which each dynamic absorber is tuned to different natural frequencies. It is noted that further improvement in the suppression effect is possible compared to the former case.
