小穴抜き加工特性に及ぼす工具形状の影響

抄録

Experiments and FEM analysis on small hole piercing were carried out. In this paper, small hole piercing is defined as piercing performed using punches that have smaller diameter than the material thickness. The results of this study clarified the followings ; 1) Shearing force, stripping force and pushing force are considerably affected by the friction between the punch flank and inner surface of pierced hole, 2) The use of tapered punch is effective for reducing frictional force, and 3) Increasing the linear portion at the punch tip increases the shearing force. The experimental and analytical results were also found to agree for these findings.