Study On Milling Deformation And Processing Parameters’ Optimization For Ruled Surface Impeller

As an important part of integral impeller aerospace engines,its blade surface usually is free-form surfaces with changed curvature.So its processing quality has a key role in the overall performance.However,the integral impeller blade is a kind of typical thin-walled parts,it is easy to cause some problems,such as processing size bias,uneven thickness,blade deformation and so on.Therefore,milling deformation and parameters’ optimization techniques on impeller machining accuracy are studied in this paper.Firstly,the whole impeller model is realized based on the fundamental natures of the B-Spline curves and surfaces by importing the impeller raw data points into UG software.According to the integral impeller processing technology,the tool path planning techniques are studied for the integral impeller machining.A good foundation is provided with the related study,including the geometry model and planning trajectories,for the milling force model,blade deformation calculations,parameter optimization of the ruled surfaces blade.Secondly,the milling force model is studied for the ruled surface side milling in five-axis machining.The milling force model for the tool cutter is studied based on the impact of surface curvature,and an equivalent cutting depth.Milling force coefficient model is established,and the coefficients are calculated by the orthogonal milling force experiment.It provides a technical support for the Finite Element Analysis of blade deformation.Thirdly,the finite element simulation of the blade is executed after importing the ruled surface blade model established in UG software into ANSYS,with the mesh,computing and loading milling force.After finishing the traditional singlepoint deformation analysis,a blade simulation cycle is achieved,which is based on the way of writing the command stream.The blades’ elastic deformation is computed with the iteration method by using MATLAB and ANSYS software.Inthe end,the ruled surface blade machining deformation computation and simulation results are achieved.Finally,the related optimization is studied for the machining process parameters,based on the ruled surface milling blade deformation obtained from the simulation results.The orthogonal experiment results are analyzed with the method of range analysis,and the optimization results for the milling parameters are calculated with the orthogonal advantages analysis.The optimization results are validated by ANSYS simulation,and the model quality evaluation is implemented.