Research on springback compensation method of 3D flexible stretch bending of multi-point roller dies

Springback compensation is considered as the best method to reduce springback error. In view of the springback defect of 3D deformed workpiece, a springback compensation method based on variable compensation factor is proposed. This method can accelerate the convergence speed of iterative compensation. In this paper, the 3D flexible stretch bending of multi-point roller die technology (3D FSB-MPRD) is introduced firstly, and then, the principle of the springback compensation method based on variable compensation factor is explained. In order to improve the springback compensation accuracy of workpiece, the total springback compensation process is divided into horizontal bending springback compensation and vertical bending springback compensation. Taking the T-shaped profile with variable curvature as the research object, the die surface is optimized and the optimal springback compensation factor is obtained by using numerical simulation after multiple iterations. Finally, the results of springback compensation are compared with the desired shape. And the effectiveness of the springback compensation method based on variable compensation factor is verified by comparing the simulation results with the test results.