Abstract: Through the theoretical analysis, the forming loading displacement method for the spherical part was studied based on the flexible roller stretch forming device. Using geometric analysis method, the relationship between the displacement of each roller and the elongation of the metal sheet was established for spherical part forming. Simulation analysis of the material of 2024-O was performed by loading displacement, the result was compared with the analytical result of the force loading, it was found that the distributions of both the equivalent stress and equivalent plastic strain gained by the loading displacement are relatively uniform. Utilizing the flexible roller stretch forming device to form the spherical part,the test results show that the displacement loading method is feasible. Comparing with the force loading, the geometric annalysis method could quickly calculate the required displacement of each roller for the load, saving enormous debugging time, providing some guidance for the stretch forming of the skin.

Key words: materials systhesis and processing technology, stretching, flexible roller, spherical part, elongation, loading displacement