Abstract: A multi-point forming with wrinkle resistance function(MPFWR) was introduced which doesn't need the edge-pressing ring. This forming mode is different from the common multi-point die forming(MPDF) in that the winkle resistant holders and form adjusting holders arrange alternately. Holding the whole blank in the forming zone, the discrete wrinkle resistant holders can float up and down along with the blank. The forming process of a spherical part in MPFWR was simulated using a finite element analysis software. The effects of the sheet metal blank thickness and the wrinkle resistant holder force on the maximum deformability were analyzed, and the results were compared with those of MPDF. It was found that the MPFWR can restrain the wrinkle of the sheet blank, gives out the obviously larger formability of the spherical part. The thinner of the blank, the better its formability. The wrinkle resistance can be enhanced by increasing the holder force.

Key words: material synthesis and processing technology, sheet metal forming, multi-point forming, wrinkle, numerical simulation