METHOD OF METAL PLASTIC STRUCTURE FORMATION AND DEVICE TO THIS END Russian patent published in 2013 - IPC B21J5/00 B21J13/02 C21D7/10 B82B3/00 

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming, particularly, metal plastic structure formation by die forging at superhigh pressures to cause intensive shear stresses and can be used for making materials with futuristic level of properties. Die forging is executed in assy composed of female die and two male dies. One hollow male die makes a clearance with female die. Another male die is arranged inside said hollow male die. First, deforming force is applied to said another male die for back extrusion of workpiece from female die and angular extrusion in said clearance between female die and hollow male die. Then, deforming force is applied to both male dies for back extrusion, angular extrusion and upsetting. Female die and hollow male die may have the ledges to decrease said clearance in making larger diameter of upset workpiece.

EFFECT: homogeneous fine-grain structure.

3 cl, 3 dwg