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The micro-drilling of Ti-6Al-4V alloy entails several limitations, including tool wear and the risk of catastrophic tool breakage. These issues emerge mostly owing to the small diameter of the micro-tool that is used for the machining process. Therefore, this study aims to enhance tool longevity and surface integrity by minimum quantity lubrication (MQL) with varying flow rate with uncoated tungsten carbide (WC) micro-drill. UNILUB-2032, a commercial cutting fluid, was utilized throughout the experiments to investigate the effect of cutting parameters (i.e., spindle speed and feed) and MQL on machinability characteristics such as cutting forces (thrust and radial force), specific cutting energy, and oversize error of drilled holes. In order to determine the oversize error of the micro-drilled holes and cutting tool wear were analysed using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The influence of the MQL on machining has been investigated via micro-drilling.

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Study of Cutting Performance of Micro-Drilling of Ti–6Al–4V Under Different Cutting Parameter and MQL Flow Rates

  • 会议论文

  • 发表日期：

    2026年

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  • Ashok Kumar,
  • Soumya Gangopadhyay,
  • Purnendu Das

摘要

The micro-drilling of Ti-6Al-4V alloy entails several limitations, including tool wear and the risk of catastrophic tool breakage. These issues emerge mostly owing to the small diameter of the micro-tool that is used for the machining process. Therefore, this study aims to enhance tool longevity and surface integrity by minimum quantity lubrication (MQL) with varying flow rate with uncoated tungsten carbide (WC) micro-drill. UNILUB-2032, a commercial cutting fluid, was utilized throughout the experiments to investigate the effect of cutting parameters (i.e., spindle speed and feed) and MQL on machinability characteristics such as cutting forces (thrust and radial force), specific cutting energy, and oversize error of drilled holes. In order to determine the oversize error of the micro-drilled holes and cutting tool wear were analysed using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The influence of the MQL on machining has been investigated via micro-drilling.