Numerical Simulation Of Multi-point Forming For Plate

Multi-point forming (MPF) is an advanced flexible manufacturing technique for sheet metal forming. In MPF, the conventional solid die is replaced by a series of discrete elements(or punches), so the objective part is formed by the envelope surface of the elements. The movement of each element is controlled independently in real time by the computer. Adjusting the relative positions of the elements, the objective part can be easily shaped according to the design. Therefore, comparing with the conventional die forming method, a significant amount of money and time to design, manufacture and adjust solid dies will be saved in the use of MPF technique. At present, the MPF press can process a mass of complicated shape and smooth-faced parts. The technology has been applied extensively to many fields, such as vehicles covered pieces, aircraft coving, hull panels, pressure vessels, architectural panels, medical alloyed-rehabilitation of various shapes and so on. Wrinkle, dimple and springback are the main defects in the forming of plate. When forming without blank holder, wrinkle appears easily, dimple is the special defect during the MPF and the springback can not be avoided during the forming of sheet metal. Study on how they can produce and predict the possible defects by numerical simulation method, choose the proper technical parameters to restrain or eliminate forming defects, and the forming quality of the parts and efficiency of manufacture can be improved consequently.The forming of large-scale sheet metal can be realized sectionally by Multi-point forming. The numerical simulation is an effective way to analyze the characteristic of technics. The sectional forming belongs to multi-step forming, the forming is more complex than the one-step forming, the research on multi-step forming adopts the finite element numerical simulation. The key of the simulation on multi-step forming includes the techniques such as boundary condition, the transfer of configuration of deformation in previous steps, the maintenance of...