Symmetry of Products in an Opposed Projection Forging

概要

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An open die forging to form opposed projections at the center of both surfaces of a specimen is adopted as one of the basic types in forging, and the similarity of metal flow patterns between the plane strain deformation and the axi-symmetric one is examined. Influences of lubricants, working speed and die geometry are discussed and the heights of upper and lower projections of the products are compared with each other. In this research, a new flow pattern, which has a centripetal flow running only towards the lower projection, is observed in the plane strain deformation. This pattern occurs due to the side wall friction and causes the un-symmetry of the upper and the lower projections of the products. It is, therefore, not correct to assume simply the existence of similarity of metal flow patterns between a plane strain deformation and an axi-symmetric one.
一般社団法人日本機械学会の論文