Vibration signal analysis for monitoring tool wear in high speed turning of Ti-6Al-4V

652-660<span style="font-size:11.0pt;mso-bidi-font-size: 10.0pt;font-family:" times="" new="" roman","serif";mso-fareast-font-family:"times="" roman";="" mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="" lang="EN-US">Vibration signals from metal cutting processes have been investigated for various purposes, including in-process tool wear monitoring. High speed machining is a machining process, where the speeds are at least 2-50 times greater than conventional machining. Titanium based alloys are difficult-to-machine materials which are widely used in various applications. Tool wear is a major problem in these materials because of their lower thermal conductivity and high hardness. In this context, this paper studies vibration signals acquired during high speed turning of Ti-6Al-4V, which is a widely used titanium based alloy for evaluating tool wear, mainly flank wear. Two types of inserts have been considered in the investigation namely an uncoated and a coated carbide insert. The experiments have been conducted with coolant and without coolant. The vibration signals have been subjected to wavelet transform (WT). The average energy of wavelet coefficients calculated from the vibration signals can be employed to monitor the tool wear in both the types of inserts investigated.