Calculated and experimental determination of energy-power parameters in wire drawing in monolithic dies

The energy and power parameters of the drawing process depend on such technological factors as the mechanical properties of the material being processed, its tendency to harden during cold deformation, a single degree of deformation, the friction coefficient at the “metal - die” contact, the design parameters of the die, and the drawing speed. The stability (non-break) of the process, the efficient and trouble-free workload of the drawing machine, and the validity of the choice of drawing equipment when designing production lines depend on the accuracy of determining the energy-power parameters. In this article, a method for calculating the energy-power parameters of the drawing process in monolithic dies on straight-line drawing machines has been developed. The proposed method for calculating the wire drawing force makes it possible to take into account hardening during cold plastic deformation of the alloy being processed, the parameters of the deformation zone during monolithic drawing, namely the degree of deformation, the working half-angle of the die, and the friction at the “metal - die” contact. The drawing speed is determined from the features of the drawing process on straight-line machines, i.e. the increase in the speed of drawing from pass to pass is carried out by the value of the drawing coefficient in the die. The power consumed by the electric motors of each pull drum is determined by the drawing force and the linear drawing speed in a given pass. Experimental verification of the method for determining the drawing force carried out on an automated laboratory drawing machine showed its adequacy. The error between the calculated and experimental values of the drawing force did not exceed 12 %, which is acceptable when performing estimated calculations of the energy-power parameters of the wire drawing process. The proposed method for calculating the energy-power parameters of the wire drawing process in monolithic dies on straight-line machines can be useful in analyzing and correcting existing wire drawing routes, evaluating the efficiency of drawing machines, selecting and designing new drawing equipment, and developing wire manufacturing technology.