THE EFFECT OF DRAWING SPEED ON FORCE PARAMETERS IN MULTIPASS DRAWING PROCESS OF STEEL WIRES

In this work the theoretical-experimental analysis of the effect of the drawing speed on force parameters in multipass drawing process of high carbon steel wires has been assessed. Theoretical analysis of the heating of the wire in the high speed multistage drawing process was carried out on software Drawing 2D, in which the longitudinal stresses, drawing forces and drawing stresses has been estimated. Whereas experimental studies consisted in measurement of force parameters in a real multipass drawing process of steel wires. The drawing process of phi 5.5 mm wire rod to the final wire of phi 1.7 mm was conducted in 12 passes, in industrial conditions, by means of a modern Koch multi-die drawing machine. The drawing speeds in the last passes were: 5, 10, 15, 20 and 25 m / s. The drawing power measurements carried out in industrial conditions during high speed multipass drawing process creates a unique possibility to verify the theoretical research based on the finite element method. The study showed a significant effect of the drawing speed on force parameters in drawing process. Depending on the actual conditions of the drawing, ie. temperature, friction and lubrication, increasing the drawing speed (in range of 5 to 25 m / s) can result in both an increase and a decrease in stress drawing.