EoW May 2011

EuroWire – May 2011

technical article

Tokai University

Shonan Campus

4 1 1 Kitakaname,

Hiratsuka-shi,

Kanagawa, 259 1292 Japan

Tel

: +81 463 58 1211

This paper was presented at Istanbul

Cable &Wire ’09. It is reproduced here by kind

permission of the IWMA and WAI.

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

Parameters of crack

Shape-related parameter

V-shaped, concave shaped,

U-shaped cracks

Depth (h)

0.10, 0.35, 0.60, 1.0mm

Breadth (a)

0.73, 0.93, 1.15, 1.40mm

Angle (θ)

60º, 70º, 80º, 90º, 100º, 110º, 120º

Direction

Circumferential direction

Material condition for wire

Material

SUS304

Young’s modulus

206GPa

Diameter

10mm, 8mm

Die half angle, reduction

=6º, R/P=20%

Friction factor

0.05μm

▼

Table 3

Parameters of crack

Figure 10

Changes of crack after

each drawing pass in experiment and

analysis

Figure 11

Deformation

behaviour of U-shaped

crack during drawing

a) Mother wire

b) 1 pass

a) Mother wire

b) 1 pass

d) 3 passes

c) 2 passes

c) U shape

Drawing

direction

Mother

wire

1 pass

2 pass

3 pass

Drawing

direction

Experiment

Analysis

Distribution of residual stress in X-axis direction - 1400

1400 [MPa]