Influence Of Milling Parameters On Surface Quality Of Aluminum Alloy Parts For Clean Machining

In laser fusion equipment,with the increase of laser power,the particulate pollutants produced after shooting also increase greatly.The pollutants adsorb on the surface of the workpiece,make the surface damage further expand,affect the laser flux and target precision,so the device has a higher requirement for the control of cleanliness.The surface and wettability of aluminum alloy components widely used in the device have an important influence on the maintenance of cleanliness.Therefore,it is of great significance to explore the influence of process parameters on the final cleanliness in the milling and cleaning process from the perspective of mechanical processing.Firstly,this dissertation simulated the milling process of 5083 aluminum alloy through finite element simulation,and established a thermodynamic coupling model.Considering the effect of cutting heat and cutting force on the surface stress and temperature of the workpiece,the influence of milling parameters on the surface quality is analyzed.The temperature and stress change curves were extracted to analyze the changes of temperature and stress on the workpiece surface at different stages in the milling process.The residual stress on the workpiece surface and joint coordinates were statistically analyzed,and the change rules of residual stress and roughness on the milling parameters were obtained.Secondly,according to the aluminum alloy surface obtained by milling,the Wenzel equation model was used as the theoretical basis for fluid simulation modeling of droplet dropping process on different surfaces.By comparing the simulation results with the droplet morphology obtained from the experiment,the reliability of the simulation is verified.By measuring the contact angle of the droplet in different surface stable state,the change rule of the contact angle on the milling parameters was obtained,and the relationship between the surface roughness and the contact angle was analyzed.Thirdly,a single factor milling experiment with the same milling parameters as the simulation was carried out to verify the simulation rule.Due to the vibration phenomenon in the actual machining process when the spindle speed is too high,the experimental results can be affected.Pollution of cutting fluid and chip exists in the milling process.After plasma cleaning,the surface contact angle is greatly reduced.The workpiece with different machining parameters was cleaned by plasma,and the influence of different milling parameters on the contact Angle after cleaning was investigated.Finally,response surface design was used to optimize the milling parameters.The prediction formulas of surface roughness,contact Angle after plasma cleaning,oil residue on milling parameters and the interaction of milling parameters on response variables were obtained respectively.And the optimal combination of milling parameters corresponding to different response variables can provide experimental parameter guidance for actual milling of aluminum alloy workpiece.