3차원 변형을 고려한 클로버 형상 소재의 업세팅 단조해석

Abstract

Upset forging of non-circular disks is characterized by the three-dimensional deformation with lateral sidewise spread as well as axial bulging along thickness. A kinematically admissible velocity field for the upset forging of clover-shaped disks is proposed. From the proposed velocity field the upper-bound load and the deformed configuration are determined by minimizing the total power consumption with respect to some chosen parameters. Experiments are carried out with annealed SM 15C steel billets at room temperature for different clover shapes and frictional conditions. The theoretical predictions both in the forging load and the deformed configuration are shown to be in good agreement with the experimental observations. Therefore, the proposed method of analysis in this work can be used for the prediction of forging load and deformation in upset forging of clover-shaped disks.