Test of 13 different die variants found substantial differences on the resulting mechanical properties for drawn steel carbon wire. Recently, the influence of the approach zone and the bearing part of a die on longitudinal residual stresses and mechanical properties of high-carbon steel wire has been investigated and published. In the research, different die types have been used, such as concave, convex and conical with a cylindrical and conical bearing part. The longitudinal residual stresses have been tested both in the laboratory (electrolytic etching) and by numerical analysis of a drawing process (Drawing 2D software). It has been found that the lowest values of residual stresses on the wire surface were for wires drawn in concave dies with a conical bearing part. The research considered only one value of the slope in the conical part, and because of difficulties in manufacturing concave dies it is worth searching for a way to achieve a drop of residual stresses from using typical conical dies with a modified bearing part.
展开▼
