METHOD AND APPARATUS OF FORMING A ONE-PIECE CORE CAP STAMPING WITH KEYWAY

摘要

A core cap is formed from a one-piece sheet metal blank in which an inner cylindrical sleeve is formed and a reverse-fold outer sleeve determining a bight therebetween, and a recess is gradually formed by stamping in the bight and the inner sleeve so as to provide a keyway with parallel side walls symmetrically parallel with the axis of the inner sleeve.