2011 Volume 52 Issue 610 Pages 1203-1207
The drawbead technique is very important for sheet metal forming in order to control defects such as springback, cracking, wrinkling. Therefore, approximation calculation models of drawbead force have been proposed in the past. However, such calculation models were applied to mild steel or aluminum alloy. In this paper, we propose an approximation calculation model of high-strength steel using the energy method and taking into account the Bauschinger effect. The calculation results were compared with the experiment results obtained under several drawbead shape conditions, and it was confirmed that the prediction value of drawbead force has good accuracy. Also, the through-thickness strain after passing through a drawbead was in good agreement with what obtained using stress reduction parameter due to Bauschinger effect. Moreover, it was found that the strain decreases effectively when the drawbead width is larger than the drawbead height. As a conclusion, the approximate calculation model discussed here is a practical and effective means of designing what tools.
