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Wire & Cable ASIA – May/June 2008 48
Quality control systems
from Conoptica
The Conoptica Production & Quality Control Systems are
unmatched. The company’s fast and accurate measuring
techniques help to improve production efficiency, reduce the
number of unintended wire production halts and enhance
die quality.
The full range of Conoptica Production and Quality Control
Systems cover applications from fast, accurate and low cost
measurement of round/shaped die and/or wire diameter to
high-end 3D full profile measurement of any geometrical
object (drawing/shaped/enamelling die/wire/rod/pin/needle/
tube) within systems range (0.010mm – 400.00mm).
Conoptica as – Norway
Fax: +47 7283 1435
Email:
Website:
Dies – a relationship
with wire
Ajex & Turner is a fast-growing, technology-driven
company engaged in the manufacturing of wire
drawing dies and die polishing, reconditioning
machines and their consumables.
The company is focussed on the direct relationship
between the wire drawing machine, the design of die
and the importance of the lubricant. The five zones of
a typical wire drawing die are the entrance zone or
bell, the reduction angle, the bearing, the back relief
and the countersink.
In a typical wire drawing operation, a number of
parameters need to be addressed besides the
draw forces, which are cumulative effects of all
passes. These include the degree of no uniformity
of deformation, changes in mechanical properties of
wire, temperature of wire at the contact interface
and history of temperature, residual stresses and
cumulative effects on wire breakage.
In the geometry of wire drawing dies, people are
now considering the importance of Contact zone.
This zone should be well designed and defined on
the basis of contact length.
Contact length means the length of reduction angle
where the actual deformation of wire takes place.
During wire drawing it is necessary to check the
contact length to achieve a better result.
A good contact length and right profile of die
produces very good results such as negligible wire
breakage. Using the existing experience some
parameters of contact length have been developed.
For instance in copper wire drawing the contact
length with 40 to 50% of wire diameter gives good
results.
For proper wire drawing, a certain area is needed for
deformation. When there is proper deformation then
there will be no typical change in the physical
properties of wire like a sudden increase in hardness
and low torsion.
For example, in steel, if the contact length is less the
deformation area will also be low. The deformation
time will also be low causing excessive heat
generation.
The excessive heat generation will spoil the physical
properties of the wire like torsional bending. But if the
area of contact length is more than wire, it will take
more time for deformation.
The heat generated during deformation will be
dispersed in a long contact area and the physical
properties will not cause negative effects.
Ajex & Turner Wire Dies Company – India
Fax: +91 11 2745 2640
Email:
Website:
The Conoptica Production & Quality Control Systems  