Drilling of steel sheet

Details Drilling of steel sheet Drilling of steel sheet

1991-03-01

1992-02-18

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148110, 148120, 29609, 408 1R, 408 42, 408701, 2191217, 21912171, H01F 104

Patent

active

050890620

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.

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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.
patent: 4963144 (1990-10-01), Paulik et al.

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