Investigation of the stress-strain state of a wire during high-speed monolithic drawing

Abstract

This article presents the results of analytical studies conducted using computer modeling in the QForm package. The influence of technological parameters of high-speed monolithic drawing on the stress-strain state and strain rate of the wire made of steel grade 10 was assessed. A billet with a diameter of 3.5 mm was drawn into a wire with a diameter of 3.0 mm through monolithic dies with a half-angle of 3; 4; 5; 6; 7 and 8° at a friction coefficient of 0; 0.05 and 0.10. The drawing speed was taken to be 10, 20, and 40 m/s. The analysis has established that increasing the value of the half-angle of the drawing leads to the occurrence of tensile stresses and strains in the surface layers of the wire. The value of the friction coefficient has a significant effect on the stress-strain state of the wire during drawing, increasing its value leads to increased unevenness of deformation along the section and increases the values and depth of penetration of tensile stresses and strains along the wire section. It has been established that the half-angle of the drawing die has a significant effect on the uniformity of the distribution of strain rates over the wire cross section. The maximum strain rate during drawing in monolithic dies can exceed twice the average strain rate. An increase in the die half-angle from 3 to 8° leads to an increase in the strain rate up to 2.5 times. The localization of high strain rates at large half-angles of wires with is concentrated in the central part of the wire. An increase in the drawing speed from 10 to 40 m/s leads to an increase in the strain rate up to 5 times. As a result of the research, it was shown that the QForm package is applicable for computer simulation of the drawing process in a monolithic die. The adequacy of the obtained results of the numerical experiment allows us to recommend it for conducting studies of the effect of technological parameters on the stress-strain state of wire of various assortment