WCA May 2008

(new & re-conditioned)

Quality control systems from Conoptica

Dies – a relationship with wire

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.

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.

The Conoptica Production & Quality Control Systems  

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: conoptica@conoptica.com Website: www.conoptica.com

Ajex & Turner Wire Dies Company – India Fax: +91 11 2745 2640

Email: ajexturner@gmail.com Website: www.ajexturner.com

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Wire & Cable ASIA – May/June 2008