Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia:
S. M. Goloviznin, Cand. End., Associate Prof., Head of the Dept. of Metallurgy and Standardization, e-mail: smgoloviznin@magtu.ru
V. A. Kharitonov, Cand. Eng., Prof., Dept. of Materials Processing Technologies

The study of the wire drawing speed influence in a monolithic conical die on the stressstrain state inhomogeneity and drawing modes was presented. It was shown that the nonuniformity of stresses and strains during drawing in monolithic round dies could be divided into two types: static and dynamic. When drawing a round wire in a monolithic conical die, stress-strain state inhomogeneity occurs in the deformation zone, which results in microcracks at the wire center. The destruction degree depends on the value of Δ-factor, which characterizes the shape of the deformation zone. When the drawing speed increases, an additional speed or dynamic deformation inhomogeneity arises in the deformation zone due to the resulting acceleration and an increase in stresses. This causes a significant increase in the parameter Δ and the working half-angle of die, called “dynamic”. Analytical expressions were obtained for calculating the “dynamic” die angle and its velocity part. The analytical expressions analysis was carried out, the relationships between parameter Δ and the die half-angle on the drawing speed were obtained. A graphical dependence of the change in the safe zone, which excludes the destruction of the wire, on the value of the “dynamic” die angle and the degree of single deformation at various drawing speeds was plotted. It was shown that the “safe” zone decreases in proportion to the increase in the drawing speed. Solutions were proposed that provide an “acceptable” value of the parameter Δ for high-speed drawing. For this necessary to design wire drawing schedules using the maximum possible reductions per pass, and the values of the working half-angles of the wire drawing die, providing “static” inhomogeneity, should be reduced by the value of half-angles dynamic change. Wire drawing should be carried out at minimum tensile stresses.

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