Multi-frequency heat treatment of a workpiece by induction...

H - Electricity – 05 – B

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H05B 6/04 (2006.01) B23K 13/01 (2006.01) C21D 9/30 (2006.01) H01F 17/04 (2006.01) H05B 6/10 (2006.01) H05B 6/16 (2006.01) H05B 6/22 (2006.01) H05B 6/36 (2006.01)

Patent

CA 2562192

An apparatus and process are provided for multi-frequency induction heat treatment of workpieces (14) including gears. High frequency power is applied to an induction coil (12) that surrounds the workpiece (14) so that a high frequency magnetic field couples with the workpiece (14) to inductively heat the workpiece. A C-core inductor (16a-b) is coupled to a coil (18) that has low frequency power applied to it. The workpiece (14) is inserted in a gap in the C-core inductor magnetic circuit so that it experiences low frequency Joule effect heating when the low frequency current is applied to the coil (18) coupled with the C-core inductor. Alternatively the workpiece may be inserted around the C-core inductor (16a-b) when the workpiece has an opening.

L'invention concerne un appareil et un procédé de traitement thermique par induction multifréquence de pièces comprenant des engrenages. Un courant haute fréquence est appliqué sur une bobine d'induction entourant la pièce de façon qu'un champ magnétique haute fréquence vienne se coupler à la pièce pour chauffer celle-ci par induction. Un inducteur à noyau de type C est couplé à une bobine sur laquelle est appliquée un courant basse fréquence. La pièce est insérée dans un espace du circuit magnétique de l'inducteur à noyau de type C de manière à être chauffée avec effet Joule basse fréquence lorsque le courant basse fréquence est appliqué sur la bobine couplée à l'inducteur à noyau de type C. En variante, la pièce peut être insérée autour de l'inducteur à noyau de type C lorsque la pièce possède une ouverture.

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