Growth and Disappearance of Transversal Cracks on Stainless Steel Wire in Wire Drawing

Abstract

The surface crack is fatal for the spring which high fatigue characteristic is required. The surface crack of drawn wire has big influence on the quality of product. As a cause of a surface crack, rolling of a wire rod and the poor handling at the time of conveyance are cited. The authors carried out multi-pass drawing of the stainless steel wire with artificial transversal crack, and have investigated growth and disappearance of crack from both sides of experiment and FEM. If drawing of the wire rod with a surface crack is repeated, it will become the check mark which the width of a concave crack spreads. Furthermore, if drawing is repeated, it will become long and slender in the direction of an axis by stress, and will become quite small. However, the crack of the direction of an axis remained and it was shown clearly that quality is affected. Moreover, the influence which the surface treatment of peeling has on a wire was also considered.