| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing an iron core, first without generating a problem on the processing of the iron core, second, having many properties required for an insulation layer, third, capable of continuously manufacturing a large number of iron cores at low cost using an inexpensive raw material.SOLUTION: The method for manufacturing an iron core comprises: applying a mixed solution of an alcohol dispersion of iron naphthenate with one of organic compounds consisting of carboxylate esters, glycols or glycol ethers on an electromagnetic steel sheet; laminating the electromagnetic steel sheet; punching the laminated sheet in the shape of the iron core by the application of a compressive load to form the iron core; manufacturing the iron core having an insulation layer consisting of an aggregate of granular fine maghemite particles and formed in an interlayer after applying a compressive load to the iron core to perform heat treatment and thermally decompose the iron naphthenate; and manufacturing the iron core having an insulation layer consisting of an aggregate of granular fine hematite particles after applying a compressive load to stress relief anneal the iron core. An inexpensive iron core can be manufactured since these iron cores does not have a problem of a conventional iron core.SELECTED DRAWING: Figure 1 |
