Induction annealing device used for conductively heating a wire comprises transformers with parallel primary windings each wound around a magnetic core formed by a packet of annular cores made of highly permeable material

摘要

Induction annealing device comprises several transformers with parallel primary windings (16) each wound around a magnetic core and secondary windings formed by a common wire loop; a cooling device (14) for the heat-treated wire (2); and a voltage source (18) for feeding the primary windings. Each magnetic core is formed by a packet of annular cores (20) made of highly permeable material having a high saturation induction. The primary windings are formed as multithread windings. The cooling device is formed as a cooling nozzle through which the wire passes and is arranged in the short circuit loop. The voltage source delivers bipolar symmetrical voltage impulses having an effective value which can be adjusted over its shape, amplitude, frequency and/or width. Preferred Features: The primary windings are wound in a sinusoidal manner using high frequency strands. The annular cores are formed as C-cores.