WCA July 2016

Dies Feature

VNT dies for smaller sizes VNT dies were introduced for compacting and drawing for larger sizes, and they are now available for RBD and intermediate (smaller) sizes. Ajex & Turner is the first company in India to introduce VNT dies in the range from 0.8 to 70mm for copper/ aluminium/stainless steel/CO 2 /MIG/high and low carbon wire. The comparison between VNT dies and tungsten carbide dies shows that the tungsten carbide dies are the most popular due to low prices but quickly lose tolerance and do not possess the precious low-friction characteristic. As far as PCD dies are concerned though, they are better than tungsten carbide dies in terms of characteristics but the high rates of PCD dies, equally increases with bigger hole diameter. For largest diameter of compacting power cables, the prices of PCD dies goes completely out of reach, increasing the production cost.

The fair comparison makes it clear that the VNT die is the best solution due to economic and performance. It has multi- layer coating of pure nanocrystalline diamond and is not mixed with any other hard material. Due to its diamond coating there is less friction on the wire surface, which also gives good wire surface finish and the same characteristic of diamond coating, maintaining +0 tolerance through- out its working life. It plays a major role in reducing copper and aluminium dust, thus saving the metal. Ajex & Turner – India Website : www.ajexturner.com

❍ A range of dies from Ajex & Turner

The PWC-S system performs wire cleaning and polishing in-line with the wire drawing machine at 6 to 12 m/s (1,200 to 2,400 ft/min). The exceptional cleanliness that is obtained allows wire direct brass coating, copper coating, galvanising and wire cleaning prior to heat treatment, and coating applications including patenting, annealing, painting, plastic coating, etc. The system incorporates new technology that enables normal cold plant water to be converted into a unique cleaning medium generating high pressure wetting/ contaminants extreme pressure extrusion hydrodynamic cavitation displace/and contaminants flush out, used to clean drawn wire at high speed in a completely green application, providing wire glossy finish in plating quality, exiting the unit totally dry. The PWC-S system effectively removes lubricant residue from the base material and is particularly recommended for cleaning applications with wires drawn upon severe conditions resulting in increased heat and burned lubricant tightly bound to the wire surface and embedded in micro-cavities. For a clean mirror reflective wire finish for decorative applications, the system can be used with emulsion including a new rust preventive additive diluted at 3 to 5 per cent concentration. The PWC-S unit is compact and can be easily installed on the finishing/last block of a wire drawing machine. Wire green cleaning provides glossy finish resisting corrosion

❍ Wire cleaning by PWC-S system

The system provides the ultimate combination of simplicity and effectiveness: acid-free, caustic-free, without ultrasonic, without chemicals, hermetically sealed zero-emission system, no fumes, and no foam. Economical and environmentally friendly, the system provides significant process savings in production of clean wire. Decalub – France Website : www.decalub.com 

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Wire & Cable ASIA – July/August 2016