EoW September 2008

english technology news

For accurate unwinding at high speed

By launching the AVS, automatic winding width control, Joachim Uhing KG GmbH & Co offers a system to prevent the formation of dents and bulges in the switchover area during spool winding. This ensures high speed unwinding without jolts during post-processing. “The formation of dents is particularly critical during winding,” explains Burkhard W Bohn, managing director for the technology sector of Joachim Uhing. “Dents bear the risk of slippage, followed by bulging layers being wound on top. During unwinding, this can cause jolts and consequently result in material rupture.” AVS detects even the first signs of dents and bulges during winding. The intelligent device memorises the respective position and corrects the error during the next strokes. This results in the spool being completely filled with a continuously cylindrical winding. Correction occurs before the switchover point by changing the winding width. The stroke increases at this end when a The new LVC/PDH rod dry preparation and wire drawing system creates a completely dry substitute to phosphate and borax wet pre-coatings, enabling high-speed direct drawing with greatly reduced wire temperature. But where has the heat gone? The system permits ‘frictionless’ drawing with a full lubricant film at the wire-die interface in the most demanding multi-draft applications. It provides a strongly adherent coat for high-tensile wire, and light water soluble coat for plating wire. The process uses dry coating and lubrication technology enabling an automatically controlled fusion of standard dry lubrication compounds, completely eliminating traditional wet pre-coating chemicals and performing as an adherent and consistent residual coat, automatically adjustable at all speeds. The system eliminates wet pre-coating chemicals and permits frictionless drawing at 18m/s with H/C spring wire drawn directly from mechanically descaled bare rod. It facilitates die Advertorial on behalf of Decalub

Flexible taping lines WTM has developed new taping equip- ment with fully motorised heads suitable for taping and wrapping standard and special wires and cables, even when using the most difficult materials, due to the high sensitivity of the electronic tape tensioning control. Big traverse wound spools of tape can be used because the motor, even working at 2,500 rpm, drives the weight. The accuracy of the taping pitch is within hundredths of a millimetre. The flexibility of these systems allows production to switch from one type of tape to another just by changing the tape itself. Any other setting can be made immediately by selecting the appropriate preset values. The taping lines are available in both vertical and horizontal configurations to suit the requirements of the individual application. Every line can be equipped with a tele-assistance module. decreasing spool speed as a bulge.” An additional sensor tells the controller on which side the deviation has occurred. The controller is suited for all winding systems that use electrical pulses to switch over. It can handle cylindrical and bi-conical spools as well as conical winding on cylindrical spool cores. The AVS is not exclusively designed for Uhing rolling ring drives. It can also be implemented in other winding systems, threaded spindle drives, or an existing winding system can be retrofitted. Wolfgang Weber, managing director for Uhing Marketing asserts, “An optimum winding result can be achieved without manual intervention even in dirt-laden environments.” Joachim Uhing KG GmbH & Co – Germany Fax : +49 4347 906 40 Email : weber@uhing.com Website : www.uhing.com

AVS, automatic winding width control from ▲ ▲ Joachim Uhing

dent is detected. During the next strokes, more material is fed, and the dent is filled. In case of a bulge, the stroke decreases accordingly, and less material is fed. “Sensors monitor both values. The AVS interprets an increase of the spool speed at constant material speed as a dent since the winding diameter must be smaller at the deviation point, and interprets a

Where has the heat gone?

Rod/wire dry coating by LVC/PDH system, ▲ ▲ in a 0.88%C application

wear of 0.30-0.50 micron per tonne of wire drawn directly from 0.88%C mechanically descaled bare rod. The system allows an output of 2.2 tonne per hour with 5.5mm mechanically descaled 0.83-0.88%C bare rod drawn directly without wet pre-coating chemicals. Decalub – France Fax : +33 1 6020 2021 Email : info@decalub.com Website : www.decalub.com

WTM Srl – Italy Email : info@wtmachinery.com Website : www.wtmachinery.com

37

EuroWire – September 2008