banner.jpg 041 Machinability on Micro-End Milling Process of Ti-6Al-4V with Nanofluid Minimum Quantity Lubrication using Hexagonal Boron Nitride Particles Dae Hoon Kim1,a, Pil-Ho Lee1,b, Jung Sub Kim1,c and Sang Won Lee2 1Department of Mechanical Engineering, Graduate School, Sungkyunkwan University, Korea. agosugns@skku.edu bfirobbong@skku.edu cpoiu0513@skku.edu 2School of Mechanical Engineering, Sungkyunkwan University, Korea. sangwonl@skku.edu ABSTRACT

This paper investigates the characteristics of micro end-milling process of titanium alloy (Ti-6Al-4V) using nanofluid minimum quantity lubrication (MQL). A series of micro end-milling experiments are conducted in the meso-scale machine tool system with nanofluid MQL using hexagonal boron nitride (hBN) particles. hBN has a layered structure having high aspect ratio and this structure enables sliding against other layers, which can provide better lubricity. Milling forces, burr formations and surface quality are observed with varying feed per tooth and lubrication conditions. The experimental results show that the hBN-based nanofluid MQL can be effective for reducing milling forces and improving surface quality.

Keywords: Micro end-milling, Titanium alloy, Nanofluid minimum quantity lubrication, Hexagonal boron nitride.

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