Drilling of steel sheet

Details Drilling of steel sheet Drilling of steel sheet

1988-10-14

1990-10-16

Sheehan, John P.

Metal treatment

Stock

Magnetic

148308, 428596, 428611, 428638, 428928, H01F 112

Patent

active

049631993

ABSTRACT:
A steel sheet (10) having a stress-relief annealed, structure with a plurality of magnetic domains (12) is made by drilling a plurality of closely spaced, small holes (15) through the entire thickness of the steel sheet, where the drilling is effective to form additional domain walls (17) and subdivide the magnetic domains.

REFERENCES:
patent: 3647575 (1972-03-01), Fledler et al.
patent: 4293350 (1981-10-01), Ichiyama et al.
patent: 4363677 (1982-02-01), Ichiyama et al.
patent: 4456812 (1984-06-01), Neiheisel et al.
patent: 4500771 (1985-02-01), Miller
patent: 4535218 (1985-08-01), Krause et al.
patent: 4613842 (1986-09-01), Ichiyama et al.
patent: 4645547 (1987-02-01), Krause et al.

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