Anyone have references or knowledge about the turk´s heads technology than use three rolls to cold rolling round wire? I only found information by manufacture such as Eurolls and Fenn, but nothing in articles.

Turks Heads as you no doubt know are by definition single plane, 4 roll cold rolling machines designed to convert round wire to rectangular or unusual shape profiles. ( www.karl-fuhr.com/en.pic.tech4b/blank.html ) In fact the name of the machine is believed to have come from the resemblance of the four rolls to the decorative Turks Head knot.

Volker Gerth, Technical Director of Karl Fuhr GmbH & Co. KG ( www.karl-fuhr.com ) wrote a short article titled "Profile Wire Rolling - With Universal Turks Heads" (4 rolls for rectangular profiles) in the November 2003 Issue of Wire & Cable Technology International Magazine.

Perhaps you can get a reprint from Karl Fuhr or from the magazine. Likewise Karl Fuhr may be able to help you with 3 roll rolling mills or with a specially designed "3 roll Turks Head".

Kindest Regards,
Peter Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com

Turks heads are an economical way to shape wire. They can be used alone or as an auxiliary piece of equipment added to a machine. Often they will be at the start end of a flat wire rolling mill and are used to pre-shape the rod prior to flattening. They have also been used by transformer manufactures to "post roll" shaped enameled wire so that they do not have to stock as many different sizes of materials. A good source of info would be Nelson Ferguson at BHS-Torin.
richard - spectre

Hi Richard,

We are pretty intrigued by your statement "They have also been used by transformer manufactures to "post roll" shaped enameled wire so that they do not have to stock as many different sizes of materials." Do you or anyone else reading this note have a reference on this post rolling process as we would have thought that there would have been enough damage to the enamel insulation to render the process impossible. Likewise, the surface area per unit weight would increase if the cross-section were reduced in size or changed from circular. Where would the enamel necessary to cover the increased surface area come from? Elastic stretch?

Kindest Regards,
Peter Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com

In July of 2003, Fenn Technologies acquired BHS-Torin Inc. of Farmington, Connecticut. To contact people at Fenn Technologies, go to www.fennmfg.com/

Peter Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com

Post rolling of enameled wire can be done when the supply wire is slightly bigger than the desired finished wire. Post rolling has been done by a major transformer manufacturer. Shaped wire has to pass a NEMA test that calls for 5% elongation and then edgwise bending. I think if you post roll and only reduce the width or thickes by a few thousands while keeping elongation under 5% you are ok. This wire is then used in an oil filled transformer. Richard - Spectre Engineering.