Influence of Minimum Quantity Lubrication design parameters on milling finishing process

摘要

This paper proposed a numerical study of the Minimum Quantity Lubrication (MQL) design parameters effects outside a rotating tool. Parameters as particle sizes for different oil mist input device parameters (inlet pressures) as function of different canalization geometries have been determinate on a previous experimental part, which are not presented here. The parameters thus identified were integrated as boundary conditions for the numerical simulation of a rotating tool during a milling surfacing process with different canalization orientations. The chip removal is not considered here. Only the numerical effectiveness of the minimum quantity lubrication is taken into account. The main goal of the oil mist is to spray the cutting edge to ensure a good lubrication on the tool-chip contact area. The simulations highlighted the impingement of the different oil particle sizes on the tool carbide inserts. A volume per unit area and a mean distance of the oil scatter from droplet impingements relative to a global virtual area from tool/chip interface were considered. The global virtual area was taken as function of the feed rate. The Taguchi method is applied in order to optimize numerical design parameters in finishing conditions as function of different parameters. The minimum quantity lubrication design parameters evaluated are canalization orientations, inlet pressure, feed rate and particle sizes. The analysis shows that Taguchi method is suitable to solve this numerical problem. The results shows that the optimal combination for a high lubrication performance at high cutting speed is based on high feed rate, with high canalization orientations and mean particle sizes.