Abstract
	For generation of ultra fine grained (UFG) structure by intensive plastic deformation (IPD) several ways have been developed. Equal channel angular pressing (ECAP) method is one of the most important methods of IPD, thanks to its simplicity and productivity of much larger samples than others. ECAP method has undergone extensive design development, which was focused on the reduction of contact friction and on the increase of the intensity of deformation during one pass. Design changes were aimed at change of the angle between the channels, the movement of each ECAP die wall and multiple crank of channel within a single ECAP die. Design changes of shaping tools can be implemented using numerical simulation in various software products. Distribution and intensity ?ef  in the ECAP process can be geometrical affected by the angle ?, ? angle and by geometric shape of a sample cross-section. The most commonly used cross-section is a circle and square, also a rectangle or other shapes that are close to the final shape of the product. The subject of paper is the engineering design (modification) of ECAP channel and its functional verification using numerical simulation in the software product Deform 3D. Modification of ECAP channel uses a rectangular cross-sectioned sample, which allows a change in cross sectional orientations between input and output of the matrix. The numerical simulations show that for the modified ECAP channel distribution of ?ef is much higher and more homogeneous than for conventional ECAP channel (circular, rectangular cross-section) because the extruded metal is flowing in the zone of plastic deformation in two directions, in axis and radially directions.