Research On Optimization Of Machining Parameters For Aero-engine Casing

Because of its thin wall,weak rigidity,complex structure and difficult-to-cut material,the machining process of aeroengine casing parts is very easy to produce machining deformation and chatter,which not only has low machining efficiency,but also can not guarantee the machining quality.Aiming at the high-efficiency cutting of aeroengine casing parts,this paper uses the finite element analysis to simulate the cutting process of casing parts,and on this basis,constructs and solves the cutting parameter optimization model of the key process of casing parts,so as to provide a feasible scheme for the precision and high-efficiency machining of such parts.The main research contents include:Firstly,the machining deformation process,chip formation,cutting force and cutting temperature generation mechanism of superalloy materials are theoretically analyzed,and the effects of cutting conditions on cutting force,cutting temperature,surface integrity and tool wear are analyzed.Secondly,the cutting process of superalloy GH2132 is analyzed based on the Deform finite element simulation software,and the steps of finite element simulation of the software are described in detail.Through the finite element analysis of cutting process,the workpiece tool cutting geometric model is established,and the influence laws of cutting parameters on cutting force,cutting temperature,machining deformation and residual stress are studied,which lays a foundation for the subsequent optimization of cutting parameters in the key process of aeroengine casing.Thirdly,the machining process of the inner ring part of the flame barrel of the aeroengine casing is analyzed,and its key machining sequence is determined.The cutting process is simulated by using the finite element analysis software Deform,focusing on the influence of cutting parameters on the machining deformation.It is found that the back draft,feed rate and cutting speed will have a significant impact on the machining deformation,and the significance decreases in turn.Finally,based on the finite element analysis results,the cutting parameter optimization model of the key process of casing parts is constructed with the material removal rate as the optimization objective and the cutting force,cutting temperature,cutting speed and feed rate as the constraints.The optimization model is solved by MATLAB optimization toolbox,combined with Pareto optimal solution and genetic algorithm.The optimization results are compared and verified.The experimental results show that the cutting parameter optimization model and its solution method proposed in this paper are very effective.It can significantly improve the machining efficiency on the premise of meeting the machining quality.