文档介绍：Wire drawing
Vermeulen Dirk
R#KLPAA/06/197
Basic principle
To reduce the diameter of the wire:
! the volume(mass) of the wire remains the length increases the diameter is reduced
V0 = V1
V0
V1
d0
d1
L0
L1
Flow of the material
how
The deformation is done in a die
Here there is the deformation but also friction
power
Force
power
All used power is converted into:
90 to 95% to the deformation of the wire =
heat 10 to 5% in residual stresses
A drawing machine is huge heat exchanger
Cooling is the name of the game
Deformation
Inhomogeneous deformation, shear loss, redundant work
2
Friction loss
µ
contact length
Homogenous deformation
reduction
Deformation
Inhomogeneous deformation, shear loss, redundant work
2
Drawing force graph
..\PDF\boekje RV
power
To have sufficient force to draw the wire through the die we need POWER
Power : comes from electric motor
How much power??? Depends on:
Amount of deformation(= reduction or elongation) to versus to
Strength of the wire HICA (%C) versus LOCA (%C)
Speed 1m/sec versus 20 m/sec
Friction in the die ( lubricant, coating die angle..)
examples
wire rod drawn to ***@2 m/sec LOCA (%C )needs : HICA (%C) needs :
Wire drawn to @ 20m/sec LOCA (%C) needs : HICA (%C) needs : kW