Analysis of vibration assisted drilling – a base for tool performance evaluation

Abstract

The primary aim of present work is to evaluate the performance of tungsten carbide (uncoated), and HSS (high-speed steel) twist drill bits in vibration-assisted drilling. Another important objective of the present work is to investigate the effects of process parameters on vibration amplitude, (i.e., displacement) in the drilling of aerospace alloys like Ti-6Al-4V and Al7075. Effect of workpiece hardness, cutting speed, feed rate, and the number of holes drilled on tool wear is also examined in dry machining. As per the full factorial design technique, experimental tests conducted on a radial drilling machine. A Laser Doppler Vibrometer used for acquiring the vibration signals occurred during the drilling process. The vibration displacement determined by FFT (Fast Fourier Transform) algorithm. It observed that at all cutting conditions (tested), tungsten carbide drill clearly outperformed HSS (High-Speed Steel) Drill. Results of this work can use as a basis for the real-time capable tool condition monitoring system in vibration-assisted drilling.