Research On Deformation Control And Cutting Parameters Optimization For High Efficiency Machining Process Of Typical Aeronautical Casing Parts Based On Dynamic Simulation

The problem of cutting deformation has been puzzling the machinery manufacturing industry.Because of its complex structure,thin wall and mostly made of difficult-to-cut materials,its problem of cutting deformation is particularly prominent.In the paper,a method of combing using cutting dynamics to predict cutting forces and using cutting process finite element analysis to predict the cutting deformation.On the basis,by reasonably arranging the number of cutting passes and its cutting parameter for key processes,the cutting deformation can be reduced,and as a result,the improvement of cutting efficiency can be achieved for such pars on the premise of meeting machining quality.The main research contents include:First of all,on the basis of systematically analyzing the mechanism of cutting deformation for aeronautical hard-to-cut thin-walled part and its compensation method,aiming at high efficiency cutting process for casing parts,this paper summarize the literatures on cutting mechanism,dynamic simulation for cutting process,finite element analysis for cutting process and its cutting parameter optimization,and a method for improving cutting efficiency for this sort component is put forward.Secondly,the basic method of dynamic modeling for cutting process,the forming mechanism of turning force,the prediction of mechanical cutting forces and stability of turning process are briefly described.Examples of predicting dynamic cutting force and chatter stability lobe diagram for turning process are also given.Thirdly,the machining technology of typical thin-walled casing parts represented by inner and outer rings of flame drum is analyzed.According to the existing cutting technology,the key machining procedures,typical processing features and their cutting parameters are determined.Finally,a simplified 3D workpiece model and a finite element analysis model are established to predict the cutting force and deformation under given cutting parameters.By reasonably adjusting the number of turning passes and their cutting parameters in key processes,the cutting efficiency can be improved without increasing the deformation.The results of verification test and trial tests confirm that the proposed method can not only improve the cutting efficiency of thin-walled casing parts,but also meet the requirements of machining accuracy.