| 摘要 |
PURPOSE:To uniformly heat and anneal a laminated iron core having an arbitrary height size and to prevent the generation of a defective product by laminating and disposing plural pieces of small blocks consisting of magnetic materials corresponding to the height size of the laminated iron core to both ends of said iron core and subjecting the iron core to induction heating. CONSTITUTION:The laminated iron core 14 consisting of many annular iron core plates 14a is disposed in an induction heating device 11 disposed with induction coils 13 in a heating furnace 12. The heat treatment compensation blocks 15 consisting of the magnetic materials are disposed to the parts at both ends of the laminated iron core 14. The blocks 15 are constituted by laminating the plural small blocks 15a-15d and the number of the small blocks 15a... to be used is determined by the height size of the iron core 14. The iron core 14 is annealed by induction heating in the above-mentioned constitution, by which the heat radiation at both ends of the iron core 14 is suppressed and the magnetic flux passing the iron core 14 is uniformized. The iron core 14 is thus uniformly heated. |
