THE INFLUENCE OF THE MULTIPASS DRAWING PROCESS IN CLASICAL AND HYDRODYNAMIC DIES ON RESIDUAL STRESSES OF HIGH CARBON STEEL WIRES

摘要

In the paper the influence of the multipass drawing process on residual stresses of high carbon steel wires has been assessed. The drawing process of 05.5 ram wires to the final wire of 01.6 mm was conducted in 11 passes, in industrial conditions, by means of a modern Koch multi-die drawing machine. The drawing speed in the last passes was 10 m/s. The experimental measure of residual stresses in wires drawn in classical and hydrodynamic dies by Sachs-Linicus method has been done. On the basis of numerical analyses of the wire drawing process, the distributions of longitudinal residual stresses on the cross section of wires, temperatures and redundant strain have been determined.