| 摘要 |
PURPOSE:To remove an oxide layer formed on the end surface of a core, and to obtain the core having excellent magnetic characteristics by annealing the core consisting of an amorphous magnetic thin-band and giving the core vibrations by applying a large magnetic field. CONSTITUTION:Stress relief annealing is executed to a wound core 1 formed by winding an amorphous magnetic thin-band by an annealing device. An AC power supply 5 is connected to an exciting coil 3 through a high-frequency power amplifier 4, and the wound core 1 is excited by high frequency. The magnetic field of a magnetic flux density region larger than the service magnetic field of the wound core 1 or a high frequency region is applied to an oxide layer 6 generated on the end surface of the wound core 1 on annealing and the oxide layer 6 excited, thus easily peeling the oxide layer 6. Conditions in which the oxide layer on the end surface of the wound core 1 can be peeled by the adhesion of the oxide layer, the thickness (it differs by the quantity of oxygen and moisture content in an inert gas on annealing) of the oxide layer formed, exciting vibrating force (the quantity of magnetostriction differs by the magnitude of exciting frequency and magnetic flux density), etc. differ in the oxide layer.
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