Thin-walled parts are widely used in aerospace applications

and their manufacturing accuracy directly determines the performance of the equipment in service. However

the effect of the heat treatment leads to the existence of residual stresses in thin-walled parts prior to machining. If not properly controlled

it is very easy to cause the part to exceed the tolerance. Therefore

for 7075 aluminum alloy sheet

the principle of residual stresses generated in the quenching and pre-stretching of the sheet is analyzed. Furthermore

the generation process of residual stresses in 7075 aluminum alloy blanks in the quenching process and pre-stretching is simulated by using the finite element method. It was found that the quenched residual stresses were reduced up to 91.2% when the blank was stretched by about 3% with a plastic strain of about 2.4%. According to the reduction of residual stresses

a simulation model for milling of thin-walled structural parts is established to simulate the milling deformation under the coupling effect of the multiple factors. The correctness of the simulation results is verified by using the milling experiments.