Numerical Simulation And Experimental Research On MQL Turning

With the rapid development of manufacturing science and technology, engineers, technical personnels and machinery operators have increasingly high demand of working environment, so the implementation of green manufacturing has become the main trend of advanced manufacturing technology. Minimum quantity lubrication is a type of the green manufacturing technology which will be a great potential method, and it attracts many experts’ attention at home and abroad, so the minimum quantity lubrication technology has broad application prospects.Referring to the application background of precision turning, a systematically numerical stimulation and experimental research on MQL turning is carried out based on showing the research development of green manufacturing technology at home and abroad. The major study contents and innovative work are listed below,First, the definition and type of jet was expatiated theoretically, the jet model was probed, and the forces of the droplets in the gas-liquid flow jeted from the MQL spray system was analysed; a MQL system was modeled based on analyzing the function of the cutting fluid in the course of machining, the atomization performance of the external MQL spray system was tested with a 3D particle dynamic analyzer and the velocity and size distribution of the particles were gained.Second, the influence of the flow flied which caused by the rotation of the workpiece in machining on the movement of the cutting fluid droplets was researched, the fluid field around the workpiece was stimulated with FLUENT to validate the existence of the negative pressure region nearby the flank while machining cylindrical, and the influence of the workpiece rotation speed, tool clearance and spray distance was analysed.Last, the machining process effect of MQL was experimentally researched, and the comparison of the cutting force, the surface roughness and the chips showed that the nozzle location has a significant influence on the machining effect, then the best nozzle location was given. At the same time, the influence of the cutting fluid mist to the environment and operators was also discussed, the formation mechanism and the existing form of harmful mist were analyzed, then the basic way to control cutting fluid mist during the MQL machining process was expatiated.