Study On Machining Deformation Simulation Technology Of Aluminum Alloy Thin-Wall Parts

Aerospace aluminum alloy thin-walled parts complex structure,high precision machining requirements,and because of poor rigidity,In the machining process,it is easy to produce deformation problems.,Influencing the assembly and performance of parts.In this paper,the processing deformation of aluminum alloy thin-walled parts are studied by simulation and experiment.First,in order to study the effect of the initial residual stress on the deformation of the 7075 aluminum alloy thin-walled rotary structure.The ABAQUS sequential coupled thermal stress analysis was used to study the quenching process of aluminum alloy thin-walled rotary structure,get the initial residual stress of the blank,and the initial residual stress of the blank is measured,the finite element method was used to simulate the machining process and the cutting test was carried out.The results show that the initial residual stress of blank has a significant effect on the processing and deformation of the 7075 aluminum alloy thin-walled rotary structure.Secondly,In order to study the influence of different processing sequences on the processing deformation of 7075 aluminum cantilever thin-walled parts.The finite element method is used to simulate four different processing sequences of symmetry,stratification symmetry,ladder symmetry and pyramid symmetry.The results show that pyramid symmetry processing method has the least deformation.Finally,using the cutting simulation software AdvantEdge to establish a two-dimensional milling machining simulation model,the milling force and milling heat were analyzed,the error of milling force between the simulation result and measured by the milling test is small,which verifies the accuracy of the finite element model.through orthogonal test,the optimal milling process parameters and the optimal combination of milling force and milling temperature are selected,then the influence of single factor on milling force and milling temperature was studied.The results show,the influence of the spindle speed on the milling force is small,and the milling force increases with the feed of each tooth,the milling width and the milling depth,therefore,when milling 7075 aluminum alloy,higher spindle speed,lower feed,milling depth and milling width should be used.The spindle speed,the feed per tooth and the milling width have a great influence on the milling temperature.The milling depth has little effect on the milling temperature.