An incremental inverted extrusion process was used to obtain magnitude and direction of particle velocities in a billet during the pressing of a tubular product. The material chosen was commercially pure lead which can be hot-worked at room temperature and is believed to be a representative species of hot-worked metals. The reported graphical technique using experimental data is applied to a problem presently insolvable by analytical methods. It was found that both axial stresses and mean pressures in the region of the die were higher on the extrusion axis and near the cylinder wall than in the central region of the billet. This stress distribution is appreciably different from that of a solid extrusion for the same reduction in area. The present solution is a distinct advance in the direction of understanding three-dimensional metal-forming problems.

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