钛合金薄壁环件制造过程残余应力与加工变形模拟与优化OA

Thin-walled titanium alloy rings are critical aerospace components,whose machining de-formation severely restricts their dimensional accuracy and service reliability.A full-process finite ele-ment model covering rolling,cooling,heating,bulging and heat treatment was established for rectangu-lar thin-walled titanium alloy rings,to systematically investigate residual stress evolution during form-ing and its effect on machining deformation.The regulation mechanism of bulging on the stress field was revealed by analyzing stress distribution under different bulging parameters,and a theoretical mod-el correlating residual stress and machining deformation was constructed and verified via simulation and experiments.Results show that residual stress mainly originates from the initial cooling stage,and sub-sequent bulging and heat treatment can significantly reduce stress amplitude and improve distribution uniformity.The optimal residual stress state is achieved at a bulging ratio of 4%and a bulging temperat-ure of 800 ℃.Simulation results are in good agreement with theoretical calculations,with a maximum error of 20.37%.The optimized process and model were validated effective for special-shaped rings,providing a theoretical basis and process guidance for residual stress regulation and deformation control of titanium alloy thin-walled rings.