WCA September 2012

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Dies, lubricantsand drawing
79 Wire & Cable ASIA – September/October 2012
Whole range available
Compacting dies are always used in bunched and stranded conductors. The
multiple wires drawn in wire drawing machines, a process before stranding, are
formed into circular/shaped conductors by passing and compressing wires to the
desired shape and sizes. The conductor sizes are mostly referred in sq, mm and
AWG.
The bow type
machines, whether
double or single
twist, are called
bunchers with the
take-up reel inside
the machine and
wire twisting at
very high speed,
usually at 5,000tpm
or above. The dies
are located at the
entrance of the
machine to gather
the incoming wires
for the bunched
conductors and
sometimes these
dies are located
before the take-up reel inside the machine to shape the wire that goes onto the
reel to make the conductor compacted, reducing the bow loading effect.
Based on the conductor construction, material and application type, the
stranding dies can be classified in the following types:
• Bunched or gathering dies
• Semi-compacting dies
• Highly compacting dies
The bunched or gathering and semi-compacting dies are basically used in low
voltage conductor making to reduce the over-all conductor diameter meeting the
specified conductor size in sq and mm. These dies are made in tungsten carbide
material.
For high voltage cables the conductor demands a high compactness level, better
shape and ridge-free formation. This is achieved using poly crystalline dies.
These dies are useful to get the exact the CR value and metal, polymer and other
accessories savings.
These dies are available for 16, 25, 35, 50, 70, 95, 120, 150, 185, 240, 300, 400,
500, 630, 800 and 1,000mm conductor.
Ajex & Turner Wire Dies Co – India Website:
New developments
There are two new developements in the wide range of tungsten carbide die
reworking machines from Bremer GmbH, Germany.
Bremer has developed the new machine KSPM1 Microcontrol. The machine
can work with very small diameter (range 0.07-0.5mm) and is specially
developed for repairing the conical section of tungsten carbide drawing dies
(0.08mm saw wire).
With automatic computer settings, the roundness can be reached with very
narrow tolerance. Furthermore, Bremer has developed grinding and polishing
equipment for the repair and production of tungsten carbide drawing dies with a
full automatic process (range 0.5-10mm).
Bremer GmbH – Germany
Website:
❍
❍ Dies from Ajex & Turner