Recently magnesium alloy sheet has been used as a lightweight material in transportation area. Warm forming is a forming method that improves formability and reduces springback. The magnesium alloy sheet has a characteristic that large difference of flow stress increases depending on strain rate at high temperature. These characteristics cause low dimensional accuracy of formed products. In this study, experiments were performed on the 2D-draw bending with respect to the temperature and forming speed in order to investigate the effects of strain rate and temperature. It was found that as the temperature increases, spinrgback of 2D-draw bending decreased and formability of AZ31B increased. Additionally, the effect of the punch speed was investigated. At 250°C, as the punch speed increased, the springback of 2D-draw bending decreased.

ABSTRACT
 1. 서 론
 2. 2D-draw 굽힘 실험
  2.1 재료 특성
  2.2 2D-draw 굽힘 실험 장치
  2.3 실험 조건
 3. 2D-draw 굽힘 결과
  3.1 온도에 따른 스프링백발생 특성
  3.2 성형 속도에 따른 스프링백발생 특성
 4. 고찰 - 성형 속도에 따른 변형 특성
 5. 결 론
 References

• 김현우(Seoul National University of Science and Technology, Department of Mechanical Design and Manufacturing Engineering) | Hyun-Woo KIM
• 유제형(Seoul National University of Science and Technology, Department of Mechanical Design and Manufacturing Engineering) | Jaehyeong YU
• 이창환(Seoul National University of Science and Technology) | Chang-Whan LEE Corresponding Author