| 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, so the desired shape of the product is formed by the envelope surface of the"element group". The position and movement of each element is controlled independently in real time by the computer. Adjusting the relative positions of the elements, one can easily shape the desired surface according to the design, and then the speedy and flexible sheet metal forming is realized. Therefore, comparing with the conventional die forming method, through the use of MPF technique a significant amount of money and time to design, manufacture and adjust solid dies will be saved. The MPF technology can be applied extensively in many fields, such as vehicles covered pieces, aircraft coving, hull panels, pressure vessels, architectural panels, medical alloyed-rehabilitation of various shapes and so on.Recently MPF has been applied to bend and distortion workpieces of nation gymnasium(nest engineering ) for Beijing Olympic Games undertook in 2008 year.A Tailor-Welded Blank(TWB) is a blank made by welding two or more single blanks together with different material type ,thickness or surface coat. TWB can meet different demands about the characteristics from the different pressing parts.As the social demands about the saving energy,environment and save driving increased, academe and industry pay more importance to TWB because of its advantaged character.But TWB bring more problemes to the pressing technic,and put forward higher demand to the die design and manufacture .Because TWB have different intension with the weld line and different characters.So discussing the feasibility of MPF for TWB is very important to TWB's application.With computer applications and the maturity of nonlinear finite element, the numerical simulation technology of sheet metal forming is developed quickly. Now...
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