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Wire
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-- 09-27-2004 @ 1:39 PM
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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.
This message was edited by vettecoupe on 11-8-07 @ 9:07 AM
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vettecoupe
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-- 09-28-2004 @ 9:37 AM
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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. ( http://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
This message was edited by vettecoupe on 4-9-05 @ 2:56 PM
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Wire
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-- 10-26-2004 @ 8:35 PM
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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
This message was edited by vettecoupe on 11-8-07 @ 9:08 AM
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vettecoupe
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-- 10-27-2004 @ 2:10 PM
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 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
This message was edited by vettecoupe on 4-9-05 @ 2:44 PM
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vettecoupe
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-- 11-07-2004 @ 1:20 PM
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In July of 2003, Fenn Technologies acquired BHS-Torin Inc. of Farmington, Connecticut. To contact people at Fenn Technologies, go to http://www.fennmfg.com/
Peter Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com
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Wire
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-- 12-27-2004 @ 10:57 PM
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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.
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vettecoupe
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-- 12-28-2004 @ 9:10 AM
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Thanks for the information Richard, this is one trick that we weren't aware of.
We do however have one more question. Even with this very minor rolling process, just how much damage is done to the enamel insulation? (After all we did note you said oil filled transformers.) We also presume that this is only for low voltage applications. (Say below 5000 volts)
Kindest Regards,
Peter Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com
This message was edited by vettecoupe on 4-9-05 @ 2:58 PM
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spectre
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-- 04-12-2005 @ 12:14 AM
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I've been gone, don't know where I went but I am back - jsut kidding. Generally the post rolling of the wire does not hurt the insulation because the elasticity of the film insulation is greter than the amount of deformation. Obviously if you "over do it" you could damage the insulation. Most of the post rolling is only making a couple of thousands changes in dimensions. I have not seen any hard data as to how much you can do but I think that it has is probably under 5% (one of the test elongates the wire 5% and then does a 180 bend and the insulation must not crack) plus the insulation must be properly adhered to the wire.
Again I don't know all of the details but I have seen it being done.
The wire was to be used in oil filled transformers. I do not know the limitation to the end product but this plant was making small distribution pole type transformers.
This message was edited by vettecoupe on 11-8-07 @ 9:06 AM
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vettecoupe
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-- 04-15-2005 @ 12:32 PM
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 Thanks Richard!
Kindest Regards,
Peter Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com
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