Formation of Stability Lobe Diagram (SLD) for Chatter Free Milling on Aluminium Alloy

Abstract

Chatter is a vibrational phenomenon which may cause damage of the tooling structure. The border between a stable (i.e., no chatter) and an unstable (i.e., with chatter) can be visualized in terms of the axial depth of cut as a function of spindle speed. The enveloping curve is a stability lobe diagram (SLD). Using SLD, it is possible to select cutting parameters to perform chatter-free cutting operations. In present study, an experimental methodology is followed based on tests in which a tapered workpiece allows gradual increase in axial depth of cut in feed direction, representing the Y-coordinate of the SLD while speed of the spindle is increased for every pass representing X-coordinate. Experiments are carried on Siemens 828D MTAB CompactMill machine. Acoustic sensor SKF CMAC 5084 is used to collect the milling sound. This work will allow operator to choose the combination of spindle speed and depth of cut for chatter free milling.