2129 マイクロチューブの逐次成形における成形限界と精度(S29-2 マイクロ/ナノ加工の動向と可能性(2),S29 マイクロ/ナノ加工の動向と可能性)

概要

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A conical punch with proper tip angle is used in the conventional forming of flaring or nosing on a tube end. The incremental forming is more effective for such a production, because the forming can be applied to various shapes with only one tool. In this research, miniature stainless-steel tubes ware deformed to flare and nose shape with bar tool, and characteristics of flaring and nosing were examined. The deformation behaviors in circumferential direction of two forming process were contrary to each other by direction of deformation and relative velocity of the bar tool transfer to the circumferential rotation at the outside of the tube. When the geometric ratio of diameter to thickness of tube was equated, the tendency of forming limit became almost the same. In case of large tool angle, the angle affected compressive force toward axial direction of the tube, and the forming limit declined.
2005-09-18