Mechanism and controlling of side-wall curl in sheet metal forming

作者：Zhou Chi^*; Yan Wu-Jun; Li Yun-Fei

来源：Journal of Plasticity Engineering, 2014, 21(2): 60-64.

DOI：10.3969/j.issn.1007-2012.2014.02.011

• Floating draw bead
• Side wall curl
• Stamping

Side-wall curl usually occurs in the bending and drawing processes of flanged parts. The shape and dimension errors caused by the side-wall curl bring difficulties in subsequent welding and assembling processes. In this paper, the reason of side-wall curl was explained by analyzing the deforming history and stress distribution at the final forming stage. Using FE simulation, the effects of variable blank hold forces and different applying methods on the side-wall curl were compared. The results showed the side-wall curl cannot be reduced by only increasing BHF. A good stage is to apply a small BHF at the beginning of stroke and then to apply a higher value in a very short distance just before the end of forming. Based on this model, a floating draw bead technology is proposed to reduce the side-wall curl. To verify this method, a set of die with floating draw bead was manufactured and used to form U shape parts. The results showed that this technology can effectively reduce the side-wall curl and is easy to apply.

• 出版日期2014
• 单位华南理工大学