せん断加工における凸輪郭部でのだれ増加機構

抄録

A large roll-over is formed on the cut edge around the convex portion of the blanked component and it causes some functional problems in gear products. This study is aimed at revealing the mechanism of roll-over formation and identifying the parameters affecting the formation. Through experiments using annealed pure aluminum, the increase in the height of roll-over d_p as in figures was observed to be independent of the punch-die clearance for a small convex-tip radius, whereas the roll-over height d_p increased only with large clearances for a large tip radius. Numerical results agreed well with the experimental results and suggested contributions of indentation deformation and radial material flow occurring at the convex tip to the increase in roll-over height d_p .