Abstract

During the forming process of sheet metals, the drawbead in the die face controls a restraining force so that the sheet flows into the die cavity with tension. In order to investigate a drawgbead restraining force and a pre-strain just after drawbeads which are essential in the finite element analysis of form-ing processes, the friction test and drawing test are employed. The experiments performed with a cir-cular bead stepped bead double circular bead and circular-and-stepped bead in the various forming conditions and bead sizes show that the restraining force varies linearly with the blank holding force. bead radius blank thickness and friction but the pre-strain nonlinearly does with them.

Keywords

• Drawbead;
• Expert Model;
• Sheet Metal Forming;
• Friction Test;
• Drawing Test

• 드로우비드;
• 전문모델;
• 박판성형;
• 마찰실험;
• 인출실험;