Research on the behaviour of the metallic material in the draw-plate while drawing the wire

Abstract

Abstract This research introduces the theoretical and experimental study of the plastic deformation through drawing of the copper wire, the presentation of the microstructures resulting after each drawing, certain possible flaws which occur within this plastic deformation process and the conclusions on the grains` flip-over and elongation. During the drawing process, the metallic material undergoes some important transformations in the draw-plate. The equiaxed grains are compressed in transversal direction and elongated in the drawing direction. The wire drawn is hardened due to the elongation of the grains and due to the development of a substructure of dislocations in the deformation grains. The theoretical presentation of the topics in discussion is then followed by a calculation of the reduction and the Δ parameter which causes less unused work if it is low value, limits the cold hardening of the wire and allows the possible execution of a higher total reduction between two annealing processes. A smaller angle for the drawing favours the coating of the lubricant and lengthens the contact area. Thus, a better cooling is obtained for the wire - draw-plate interface and the lubricant film is more stable.