Research on residual stress and deformation control of domestic 7050 aluminum alloy thin-wall bearing frame turning

Researching the deformation control of domestic 7050 aluminum alloy aviation thin-walled bearing frame parts during turning processing is crucial for ensuring machining precision and performance while maintaining cutting efficiency with minimized radial deformation. Initially，a three-dimensional turning residual stress simulation model is established and validated through experiments for the accuracy of the domestic 7050 aluminum alloy thinwalled bearing frame turning simulation model. Subsequently，an orthogonal experiment is conducted based on the three-dimensional turning simulation model to establish a mapping model between turning parameters and residual stress. Finally，with the objectives of turning efficiency and residual stress optimization，optimized turning parameters for the domestic 7050 aluminum alloy aviation thin-walled bearing frame are obtained using a genetic algorithm. The results show that the optimized machining surface residual stress is reduced to 15.6 MPa，and the maximum radial deformation of the bearing frame is 1.59 mm，which is about 19% less than the original turning parameters，achieving the goal of controlling and optimizing the processing deformation of the domestic 7050 aluminum alloy aviation thin-walled bearing frame.