TECHNOLOGY NEWS:
Induction annealers for round, flat and profile wires
Leading European producers of round, profile or flat wire made of copper, copper alloys and other non-ferrous metals have been the primary users of the new RI type continuous induction annealers developed by NBM. Up to now, 20 RI annealing systems have already gone into industrial operation, and an additional eight systems have been sold. NBM, a joint-venture company founded by Maschinenfabrik Niehoff, the rolling mill maker Bühler & Co. and the annealing specialist Dr. Menge, offers five system sizes.
The new annealing technology has several advantages: by feeding the wire contactless through magnetic cores, a voltage is induced and generates a current in the wire, which heats it up due to its electrical resistance. As there is no need for slip rings and carbon brushes, the associated friction is eliminated, and the annealer works without own drive unit. Compared with annealing in a bell furnace, continuous induction annealing causes the same wire material and at least equivalent mechanical properties. As the grain size is very fine, tensile strength and yield limit are up to 30N/mm2 higher, and elongation is the same or higher. The annealing method is particularly well suited for copper alloys such as brass, bronze, silver and also for nickel and nickel alloys. It can also be used for copper, tin-plated copper or silver-plated copper, precious metal wires and their alloys, as well as for composite wires such as Cu+Fe, Cu+Ni, Al+Cu, and special material wires such as dispersion materials a range of diameters from 0.15 to 4.5mm.
The RI-420-R and RI-560-R type annealers for round wires can run between 1.2 to 1.5mm diameter range at speeds up to 16m/s and for larger wire sizes (4.5mm resp. 5.3mm up to 2.2 m/s). The induction annealing systems enable wire manufacturers to produce higher quality annealed wire in-line with the drawing and/or rolling process, and they can also significantly reduce their production costs. NBM develops induction annealing systems, especially for non-ferrous metal applications, and integrates annealers in-line into drawing lines, rolling mills or combined systems. Niehoff Group and NBM together with its partners offer, except extruders, all kind of machines and equipment required for the production of wires and cables.
Maschinenfabrik Niehoff GmbH & Co. KG - Fürther Straße 30 - D-91126 Schwabach - Germany
Fax: Int’l +49 9122 977 155
E-mail: [email protected]
Website: www.niehoff.de
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NBM Niehoff Buhler GmbH |
Country: |
Germany |
Fax: |
+49 7231 600343 |
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