Numerical simulation of MQL flow field for precision turning

MQL(minimal quantity lubrication) machining produces almost similar cutting performance to conventional flood supply machining while using much less metal working fluid. To take full advantage of MQL machining and expand its applicability, an understanding of its flow field behavior is critical. Hence, in this study, it is analyzed that the influence of airflow movement surrounding workpiece on cutting fluid drop in turning according to Hydromechanics. Through numerical simulation of MQL flow field, the air on workpiece surface can form a surrounding flow field when workpiece rotates with high speed in the air. In order to reach workpiece surface, the initial velocity of coolant particle must exceed critical value and overcome the obstacle of air flow field. A zone of negative pressure exists between workpiece and flank tool face when turning and is in favor of coolant particle arriving tool nose.