<Paper>Finite-Element Simulation on Wire Breakage Induced by Eccentric Inclusion in Shaped Wire Drawing

概要

論文の詳細を見る
The causes of wire breakage have long been studied. The most significant problem of wire breakage during fine wire drawing is breakage due to inclusions. In this paper, the effects of eccentric length (L_e) and inclusion size (D_I) of a noncenter-axis-located inclusion on shaped wire drawing were investigated. For this purpose, an experimental investigation for the optimal die half-angle was conducted for copper wire. Based on experimental data of the optimal die half-angle, the deformations, the mean normal stresses, the drawing stresses and the plastic strains of copper wire which contain an eccentric or centric inclusion were calculated by finite element analysis. It was found that during wire drawing, necking, wire bending and misalignment occur for eccentric inclusion wire drawing but only necking occurs for centric inclusion wire drawing. Inclusion rotation was found for eccentric wire drawing. Highly compressive stresses act on the die contact surface nearest to the eccentric inclusion so that the die contact surface easily wears out. For the same inclusion size, the drawing stresses are strongly influenced by inclusion size and slightly influenced by eccentric length, and drawing stresses of centric inclusion wire are greater than eccentric inclusion wire. The larger the inclusion size and the smaller the eccentric length, the higher the drawing stress, which leads to a higher possibility of wire breakage.
東海大学の論文