WCA September 2008

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F I N I S H E D F O R P R E C I S I O N

The AVS, automatic winding width control, from Joachim Uhing KG GmbH is a system to prevent the formation of dents and bulges in the switchover area during spool winding, to ensure high speed unwinding during post-processing. “The formation of dents is particularly critical during winding,” explains Burkhard W Bohn, managing director of Uhing’s technology sector. “Dents bear the risk of slippage, followed by bulging layers being wound on top. During unwinding, this can cause jolts and 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 in respectively defined windows before the switchover points by changing the winding width. The stroke increases at this Uhing unwinds at high speed

tc. Drawing dies / Casings ➘ Die working machines ➘ Spare parts ➘ Service & Technical assistance ➘ Diamond suspension ➘ Diamond grinding pins ➘ Calibration pins L=80 mm ➘ Calibration wires L=35/40 mm ➘ Conical steel needles ➘ Machines

Die cone polishing machines for small diameter (steel cord) Ø 0.15 – 2.00 mm The die working machines KPS1 & EK2000F are equipped with a Siemens Simatic SPS Control and therefore offer a high degree of automation and efficiency. The die geometry as well as well as the diameter can be determined without any need of skilled and experienced operators. Calibration pins

end when a 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. “These corrections are based on the requirement that line speed and spool speed is proportional,” explains Bohn.

“Sensors monitor both values. The AVS inter- prets an increase of the spool speed at constant material speed as a dent since the winding diameter must be smaller at the deviation point. “On the other hand, the AVS interprets a decreasing spool speed as a bulge.” The AVS will immediately react by compensating the error on the respective side. 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 can be implemented for Uhing rolling ring drives and other winding systems such as timing belt or threaded spindle drives. Existing winding systems can be retrofitted. “The AVS can store up to ten different spool types,” says Wolfgang Weber of Uhing Marketing. “An optimum winding result can be achieved automatically, even in dirt-laden environments.” Joachim Uhing KG GmbH & Co m m launches the AVS, automatic winding width control system

We dispose of a new CNC-controlled High Tec machine, for the production of high quality Calibrating pins, particularly to be able to produce these pins

also in graduation steps of 0,001 mm, with an accurate tolerance of 1 μm.

To assure the accuracy of these very small tolerances, we dispose of a laser analyzer, where all Calibrating pins are verified after and during the production, to guarantee a very high preciseness of all pins manufactured by this new machine. WIRE Shanghai, 23.09. – 26.09.2008 F25 Hall W1

Drawing dies & modern Tc. Die working equipment Im Seifen 18 / D-35756 Mittenaar ( ++49 (0) 2778-2281 / ++49 (0) 2778-2190 www.bremer-willi.de Bremer.Willi@t-online.de

Joachim Uhing KG GmbH & Co – Germany Fax : +49 4347 906 40

Email : weber@uhing.com Website : www.uhing.com

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Wire & Cable ASIA – September/October 2008