Simulation of Deformation and Optimization of Process Parameters for Low-Temperature Milling of Aircraft Engine Blades
Aiming at the problem of deformation induced by residual stresses in the milling process of aircraft blades,the blade milling simulation was completed based on Deform and Abaqus,and the overall blade deformation under residual stress was analyzed.The feed per tooth fz,spindle speed n,depth of cut ap and jet temperature T were taken as process parameters,and a single-factor con-trol scheme and central composite design test were designed to study the effect of the jet temperature univariate and multivariate envi-ronment of process parameters on the deformation of the blade.The blade deformation prediction model was established by multivariate quadratic regression method,and the fitting values between the prediction model and the experimental data was checked by variance analysis.With relatively low blade deformation as the optimization objective,genetic algorithm was used to obtain the optimal set of process parameters.The results show that in the single-factor test,the blade deformation decreases by 35.66%at-180℃compared with 20℃,but the margin of the blade profile exceeds the allowable range(±0.05 mm).Therefore,the genetic algorithm was used to optimize the process parameters.The cooling temperature range is from-196℃to-180℃with a maximum deformation of 0.038 9 mm,which meets the blade contour deformation error.
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