EoW May 2011

technical article

This paper was presented at Istanbul Cable &Wire ’09. It is reproduced here by kind permission of the IWMA and WAI.

Experiment

Analysis

Mother wire

References 1 H Tanaka et al, “Analysis of copper wire breaks,” Furukawadenko-jihou, Volume 59, 1976, pp 91-98 2 J Togasi et al, “An analysis of copper wire breaks during drawing,” Furukawadenko-jihou, Volume 66, 1979, pp 25-32 3 T Yamasita and K Yoshida, “Classification of wire breaks and countermeasures in superfine gold wire drawing,” Wire Journal International, March 2005, pp 180-184 4 T Yamasita and K Yoshida,“Analysis and prevention methods for wire breaks in ultra-fine gold wire drawing,” Wire Journal International, March 2007, pp 200-203 5 K Yoshida, “FEM analysis of wire breaks in drawing of superfine wire with an inclusion,” Wire Journal International, March 2000, pp 102-107 6 The Japan Society for Technology of Plasticity, Drawing, Corona sha Co Ltd 1990, pp 68-73 7 Standardization Committee of the Iron and Steel Institute of Japan, Definition of surface crack for steel rods, 1987 8 T Shinohara and K Yoshida, Iron and Steel, Volume 90, No 12, 2004, p 31 9 T Shinohara and K Yoshida, “Effect of rolling and drawing of rod wires on removal of surface cracks”, Wire Journal International, Volume 37, 2004, pp 52-57 10 The Japan Society for Technology of Plasticity, Drawing, Corona Co, Ltd p 14 and p 69 11 K Yoshida and Y Shinohara, Prediction of Surface Micro-Defects in Plate Rolling, No 9690, Current Advances in Materials and Processes, 2004, pp 11-14

1 pass

Drawing direction

2 pass

3 pass

Distribution of residual stress in X-axis direction - 1400

Figure 10 : Changes of crack after each drawing pass in experiment and analysis

1400 [MPa]

a) Mother wire

b) 1 pass

c) U shape

Drawing direction

b) 1 pass

a) Mother wire

Figure 11 : Deformation behaviour of U-shaped crack during drawing

d) 3 passes

c) 2 passes

▼ ▼ Table 3 : Parameters of crack

Parameters of crack

V-shaped, concave shaped, U-shaped cracks 0.10, 0.35, 0.60, 1.0mm 0.73, 0.93, 1.15, 1.40mm

Shape-related parameter

Depth (h) Breadth (a) Angle (θ) Direction

60º, 70º, 80º, 90º, 100º, 110º, 120º

Circumferential direction

Material condition for wire

Tokai University Shonan Campus 4 1 1 Kitakaname, Hiratsuka-shi, Kanagawa, 259 1292 Japan Tel : +81 463 58 1211

Material

SUS304 206GPa

Young’s modulus

Diameter

10mm, 8mm α =6º, R/P=20%

Die half angle, reduction

Friction factor

0.05μm

61

EuroWire – May 2011