Ya.E.Beygelzimer, V.N.Varyukhin, V.G.Synkov, S.G.Synkov
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An idea of intensive shear accumulation and the size effect are used to realize the nanostructural state (NSS) in materials by using the the alternating hydromechenical pressing with backpressure (AHPB) to 1GPa in helical die and by means of packet hydrostatic extrusion.
AHPB eliminates the problem of section compaction, pressing-out and loss of stability. During one deformation cycle, the accumulation of e=1-2 and e=2-3 is possible in ferrous- and non-ferrous metal speciment,respectively. Section of the helical bore, orthogonal to die axis, is constant along the axis. The angle of helical axis inclination to the extrusion axis varies from 0 to the maximum at die inlet, decreasing to zero at the outlet.
Apart from the above advantages, the packet hydrostatic extrusion with a special separation of wire elements at the initial stage of deformation and ending in their consolidation, realizes the idea of the interestial atom (N,C,B) generation from the separating substance to the body of microfibre, thus reinforcing the material with NSS stabilization.
Basing on kinematically possyble velocity fields, pressure values have been estimated for AHPB realization, calculation of the level of deformation accumulated in one cycle of pressing and for the evaluation of power consumption. The schemes were tested when producing rods from aluminium, copper, titanium, pearlite and austenitic steels.

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