Investigation of the effect of blank holder force distribution on deep drawing using developed blank holder divided into double rings

A new blank holder divided into double rings is proposed, in which the blank holder force (BHF) can be independently and effectively applied on different flange regions. In this paper, the principle and characteristics of the new blank holder technique are expatiated by theoretical derivation and stress analysis. All results indicate that the distribution of BHF applied by the double rings blank holder is more reasonable than a single blank holder under the condition of proper parameter selection, and the wrinkling can be better suppressed. The effectiveness of the double rings blank holder has been proven by deep drawing experiments. Using the new blank holder technique, the flange wrinkling was demonstrated to be more eliminated than that using the single blank holder. Moreover, experimental results also corroborate that the parameters of BHF distribution ratio and the boundary diameter of the two rings have a great influence on the effects of the new blank holder technique.

Automated summary

A new double rings blank holder technique has been proposed in this paper, which can independently and effectively apply blank holder force on different flange regions, and it has been experimentally proven to be more reasonable and effective in suppressing wrinkles compared to a single blank holder. The distribution ratio of BHF and the boundary diameter of the two rings were found to have a significant influence on the effectiveness of the new blank holder technique.