Calculation of indicators of plastic deformation nonuniformity during drawing of high-strength pearlitic steel

During drawing of high-strength pearlitic steel, deformation-induced nonuniformity of plastic deformation is characterized by the lead of the wire central layers and metal rise at the entry to the die working cone. A calculation-based method is proposed for controlling deformation nonuniformity using empirical equations describing the dependences of metal rise at the die entry on wire strength, single reduction, and drawing tool cone angle, as well as the relationship between the lead of the wire central layers and metal rise when the die deformation zone angle changes. Metal rise increases with increasing wire strength, single reduction, and drawing tool cone angle. A similar trend is also characteristic of the lead of the central layers in high-strength wire. When transitioning to an ultra-high-strength state, an increase in the lead of the central metal layers is observed with a decrease in the die working cone angle, which is associated with the increasing effect of the larger contact surface area in the deformation zone on the growth of drawing force and tensile stresses. Improvement of plastic deformation uniformity during multiple drawing is ensured by decreasing, in the final passes of the drawing route, the single reduction and drawing tool cone angle for high-strength wire, and the single reduction for ultra-high-strength wire. The calculated values of deformation nonuniformity indicators across the wire cross section agree with experimental results and are confirmed by monitoring the plastic properties of cold-drawn high-strength wire.

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