Press Bend Forming Analysis Based on DTPMS for Butt Joints on Aircraft Panels

摘要

Aluminum alloy integral panels are widely used in modern large aircraft. The common forming method for integral panels is press bend forming and assisted with peen forming. Because of the larger thickness size and high strength of butt joints on integral panels, the press bend forming method, which is simple, convenient and short production cycle, is used to manufacture butt joints. In order to improve curvature accuracy of butt joints during press bend forming, a Dynamic Three Point Multi-step (DTPMS) press bend forming method was proposed in this paper. Then, the problem of springback in bending process was analyzed, and the calculation model of punch displacement and workpieces’ deflection was further established based on elastoplastic theory, energy method and mathematics. Finally, the proposed method was verified in ABAQUS/Standard and it can be concluded that the method is efficient.