SILICON STEEL SHEET FOR ADHESION TYPE LAMINATED IRON CORE

摘要

PURPOSE: To obtain an electrode steel sheet for an adhesion type iron core excellent in adhesive strength by adjusting the ruggedness on the surface of a steel sheet and regulating its three-dimensional surface roughness into a specified one. ;CONSTITUTION: The three-dimensional surface roughness of the surface of a steel sheet is regulated to ≤0.5μm by the center face average roughness SRa, and the maximum height SR_max is regulated to 0.1 to 2.0μm. Furthermore, in each recessed part, the point (the point at which the differential coefficient in the load curve other than the points at which the cut section area ratio is 0% or 100% is the minimum) at which the fall in the depth direction is the largest in the load curve is regarded as the center, the difference in the height direction between two points at which the cut section area ratio is different respectively by ±10% satisfies ≥50% of SR_max. Moreover, SRa in the tip face of the projecting part is regulated to ≤0.3μm. This adjustment of the ruggedness on the steel sheet surface can be executed by forming prescribed ruggedness on the surface of a rolling roll and transferring it to the surface of the steel sheet at the time of rolling. The surface of this electrode steel sheet is provided with an adhesion type insulating film having 3 to 20μm film thickness, and the steel sheet is laminated, and heating and press-adhering are executed to obtain a laminated iron core.;COPYRIGHT: (C)1994,JPO