Research on Deep Drawing Process Using Radial Segmental Blank Holder based on Electro-permanent Magnet Technology

2020 
Abstract In this paper, a novel radial segmental blank holder technique based on electro-permanent magnet (EPM) technology is proposed. The blank holding force (BHF) can be independently and effectively applied on different regions of flange in a more convenient and low-energy way. The principles and advantages of radial segmental blank holder technique are first expatiated and analyzed by theoretical derivation and numerical simulation. The results indicate that there is no overheating problem during the continuous forming process. The distribution of the BHF applied by the radial segmental blank holder is more reasonable than from that of using the single blank holder and it can also better suppress wrinkling. Finally, the effectiveness of the EPM radial segmental blank holder is proven by forming experiments of 08Al steel. It is demonstrated that the flange wrinkling of the drawn cup is better eliminated using the new blank holder and the forming limit is improved compared to using the single blank holder.
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