Research on Machining Deformation of 7050 Aluminum Alloy Aircraft Rib Forging

T-type rib strip was the key connective component between the fuselage and wing of the aircraft and the main processes for preparation of T-type rib strip consisted of forging forming, solution quenching, cold pressing and machining. The variation of residual stress and its effect on the deformation during the final machining process was quite complex. In this study, the numerical models of solution quenching, cold pressing and machining of T-type rib strip was established. The variation of residual stress on the deformation of T-type rib strip was studied. The results show that the maximum quenching stress of the T-type rib was about - 200 MPa at the surface and 150 MPa in the core. A reduction of 60% of the average residual stress can be achieved during the cold pressing process with a reduction rate of 3% and a friction coefficient of 0.3. Compared with direct machining after quenching, the deformation of machining after solution quenching and cold pressing was greatly reduced and the reduction rate reached 65.04%.