| 摘要 |
A method of forming an armature core for an electric rotating machine is disclosed. The band-shaped metal sheet for forming a core sheet has a multiplicity of grooves formed along a longitudinal edge which defines the inner peripheral edge of a core sheet when the metal sheet is formed into an annular shape. The metal sheet is wound around a mandrel having projections thereon so that the grooves engage with the projections, respectively. Then, the grooves which open at the inner edge of the disk are deformed so as to be closed, for example, by ironing the inner peripheral edge of the disk. Thus, the inner surface of the core sheet for press-fitting an armature rotary shaft is formed into a continuous surface with no groove opening present therein. Accordingly, when the armature rotary shaft is press-fitted into the shaft, the core sheet contacts the shaft around the complete inner circumference of the bore, thus ensuring firm press-fitting of the shaft.
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