Residual Stress Reduction of 7050 Large-Scale Aluminum Alloy Forging Based on Segmented Cold-Pressing Method

The quenching-induced residual stress of 7050 large-scale aluminum alloy forging was reduced by segmented cold-pressing method. The value and distribution of the residual stress of the forging before and after segmented cold-pressing were simulated by Deform-3D finite element software, and the residual stress of the forging was tested by the blind hole method. The results show that the residual stress of the forging was effectively reduced after segmented cold-processing. The residual stresses measured were less than 130 MPa and the 70.3%-97.4% reduction was achieved. The reduction range of residual stresses in the non-lap zone was bigger than that in the lap zone. The simulation results agreed with the test results.