The processing of metals by pressure includes technological processes, as a result of which the shape of a metal workpiece changes without disturbing its continuity due to the relative displacement of its individual parts, that is, by plastic deformation. In the processing of metal by pressure, the ability of metals, under certain conditions, under the influence of applied external forces, to change, without collapsing, the size and shape and retain the resulting shape after the termination of the forces, is widely used.