Fundamental Research On The Internal Cooling MQL Milling Process

In recent years,in the pursuit of efficient high-speed machining at the same time,more and more attention are paid to the greening of the cutting process.Micro-lubrication(MQL)technology is a green processing methods.which,cooling and lubricate cutting area,with atomizated,micro-lubricating fluid using high pressure gas.Compared with the traditional wet cutting technology,MQL technology has the advantages of good cooling and lubricating effect,small cutting amount and small environmental pollution.TC4 titanium alloy and AZ31 B magnesium alloy are difficult-process materials.The cooling conditions have great influence on the surface quality,cutting vibration and chip morphology of the workpiece.Therefore,the internal cooling MQL milling of TC4 titanium alloy and AZ31 B magnesium alloy test is of great significance.In this paper,based on the domestic and international research on internal cooling of MQL,the system carried out the study of internal cooling MQL milling process has been carried out.Based on the principle and characteristics of MQL atomization,a set of internal cooling MQL system is designed.According to Fluent software,the flow field distribution and the cooling effect of the workpiece in the internal cooling MQL are simulated to determine the size and position of the cold hole in the tool.The inner-cooled MQL milling test was carried out on the TC4 titanium alloy and AZ31 B magnesium alloy based on Abaqus software,and the internal cooling MQL milling simulation was carried out on the Mazak VTC-16 A CNC machining center to discuss the internal cooling MQL milling Technology,which was used to determind the best milling parameters.The main contents of this paper are as follows:(1)Systematically described fluid mechanics and internal cooling MQL theory.The flow field distribution of cutting fluid in the tool is studied via Fluent simulation.The distribution of the flow field at the nozzle and the cooling effect of the workpiece are analyzed emphatically.The internal cooling cutter is designed accordingly.(2)The milling and simulation of TC4 titanium alloy and AZ31 B magnesium alloy were carried out with Abaqus software.The milling vibration curve was collected via the post-treatment,and the displacement-distance curve of the surface surface of the machined surface was simulated.The influence of different milling parameters on milling vibration and surface roughness is analyzed,which can be used as a reference for the selection of internal cooling MQL milling process parameters.(3)Under the condition of internal cooling MQL,the single-factor and orthogonal test of internal cooling MQL milling of TC4 titanium alloy and AZ31 B magnesium alloy were carried out respectively.The influence of spray parameters and milling parameters to mill vibration surface roughness and chip morphology were analyzed using Range analysis method.(4)According to the results of the simulation and internal cooling MQL milling test,based on the theory of signal-to-noise ratio analysis,the milling parameters are optimized,which provides theoretical basis for selection of actual MQL milling process parameters.