Abstract
A new forming method using flexible blank holder with multi-point which can restrain wrinkles was discussed. Better forming results were obtained by changing the number of layers of blank holder. The wrinkling phenomenon of sheet metal parts in the course of multi-point forming is studied by finite element numerical simulation. The distribution of stress and strain and sheet thinning of the formed parts in the course of the non blank holder and flexible blank holder were analyzed. It proved that the flexible blank holder with multi-point forming method can effectively restrain the wrinkle of the sheet. In order to verify the feasibility of the new forming method using flexible blank holder with multi-point, series of relevant forming experiments were carried out by multi-point forming equipment.
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