Technological residual deformations prediction of GTE blades by numerical method after end milling

The article presents a technique that makes it possible to predict the technological residual deformations of GTE blades obtained at the stages of end milling as a result of the effect of residual stresses. The first part of the technique makes it possible to determine the magnitude, bijugat and character of the residual stresses distribution formed in the surface layer of the workpieces in the operations of end milling. The adequacy of the technique was verified by investigating the convergence of the numerical computation results with the results of field experiments. As a result of the research, a power-law dependence was obtained, which makes it possible to determine the value of the maximum circumferential residual stresses depending on the parameters of the end milling processing mode. The second part of the technique makes it possible to determine the residual deformations of the GTE blade based on the residual stress distribution diagrams obtained when using of the first part of the technique or obtained on the basis of field experimental investigations. Also, power-law dependences are obtained in this work, which make it possible to determine the value of the maximum deviations of the control sections of the investigated GTE blade, depending on the parameters of the end milling mode.