Deformation conditions of the drawing process of high‑tensile wire made of perlite steel

The drawing process of high-strength perlite steel is characterized by an excess of the advance of the central layers of the wire in comparison with the rise of the metal at the entrance to the working cone of the draw. A quantitative assessment of the ratio of deformations across the cross-section of the wire depending on the taper of the drawing tool has been performed. An increase in the angle of the working cone of the draw increases the rise of the metal to a greater extent and reduces the excess of the advance of the axial zone of the wire. The increased deformation sensitivity of the rise of the metal allows it to be used as the main criterion for the unevenness of plastic deformation. Metal lifting is accompanied by an increase in compressive stresses and stresses on the contact surface, which makes it difficult to supply lubricant to the deformation zone and causes an increase in the drawing force and temperature. The dominance of tensile stresses in the deformation zone of the central layers of the wire accelerates the initiation of irreversible damage in the cold-deformed metal during the drawing process. To increase the uniformity of plastic deformation: counter-tension must be applied at all junctions of multiple drawing; a method for calculating optimal counter-tension is given, which should include the tension of wire alignment (straightening) before entering the fiber and an increase in drawing stress due to metal lifting at the beginning of the deformation focus; improvement of drawing technology in the hydrodynamic friction mode using prefabricated lugs is justified due to their rotation and reliable direct cooling with water of the outer surface of the cage of the rotating drawing tool.

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