Measurement of Liquid Film Thickness Accumulated on Surface Machined by Minimum Quantity Lubrication (MQL)
Keywords:liquid film, minimum quantity lubrication, MQL
This paper investigated the liquid film thickness of cutting oil accumulated on test surface machined by minimum quantity lubrication (MQL) milling process. The objective of investigation is to give the overview of cutting oil behavior on the machined surface. The measurement was carried out by using laser-induced fluorescence (LIF) method. The experiments were carried out by varying the cutting speed to investigate its effects on the cutting oil film thickness. This investigation found that the cutting oil film thickness remains stable at certain area for cutting speed below than 40 m/min. However, the decreasing thickness started to occur around one-third point of the milled route. At cutting speed 40 m/min, the cutting oil film thickness presents unstable fluctuations along the entire milled route. However, the thickness almost stays the same along the entire milled route. The average liquid film thickness is not significantly affected with increasing cutting speed. The maximum average thickness is approximately 2.6 mm.