Tool-Tip Vibration at High Frequencies

Abstract

This chapter presents a theoretical and experimental investigation of the influence of tool-tip vibration on surface generation in single-point diamond turning. Although it is well known that the relative vibration between the tool and the workpiece plays an important role in surface generation in single-point diamond turning, most of the previous work has focused on studying the relative tool-work vibration in the infeed (thrust force) direction while the significant contribution of the effect of the tool-tip vibration in the cutting force direction has been overlooked. In ultraprecision diamond turning, the characteristic twin peaks are identified and found to correspond to the tool-tip vibrations by power spectrum density analyses. The vibrations possess the features of small amplitude but high frequency. A theoretical physical model is proposed to describe and correlate the characteristic peaks in the frequency domain with the behaviour of the tool-tip vibration in the steady-state cutting process. The proposed model has the capability of capturing the dominant factors influencing the surface roughness of the machined surfaces.