원통형 다이에서 스트립의 굽힘에 관한 실험

In industrial practice, it is difficult and rare to apply pure bending to workpieces; instead, metal strips, bars or sheets are often brought to a cylindrical shape by a cylindrical punch and die set. However, most of the previous research on bending and springback of strips and sheets has only examined pure bending. This paper experiments on bending of strips in cylindrical dies. An emphasis is placed on the separation between strips and punches and the occurrence of the multi-point bending during the process of deformation. The deformation mode and the final punch load influences the final shapes of strips, and the amount of springback depend on the material and the thickness of the strips.