FRF Estimation through Sweep Milling Force Excitation (SMFE)

Abstract

Inaccurate machine dynamics characterization is thought to be one of the main sources of errors in current cutting stability models. For this reason, traditional dynamic characterization procedures have been called into question. A new method for frequency response function (FRF) estimation using the real milling force as the input excitation is proposed. It consists of exciting the structure through several cutting tests at increasing or decreasing spindle speed while measuring its response. This sweep milling force excitation (SMFE) procedure allows obtaining the FRF under real cutting conditions. The results obtained have improved stability prediction with respect to conventional impact tests