Apparatus for reducing the watt loss of a grain-oriented electro

Details Apparatus for reducing the watt loss of a grain-oriented electro Apparatus for reducing the watt loss of a grain-oriented electro

1982-07-15

1985-04-30

Larson, Lowell A.

Metal deforming

By shot-blasting

51418, 51410, 51310, B21J 2210

Patent

active

045135975

ABSTRACT:
The watt loss of a grain-oriented electromagnetic steel sheet can be reduced by known methods in which serrations or scratches are locally formed on the steel sheet or a small ball or disc is rolled or rotated over the steel sheet. The known methods are disadvantageous in that the rate of production is low and in that the steel sheet has a marked unevenness.
In the present invention, particles, e.g., steel shots, are projected onto substantially linear selected portions of a grain-oriented electromagnetic steel sheet, thereby producing strain in spot-formed regions. An apparatus according to the present invention comprises an endless conveyor and a means for projecting particles. Slits are formed in the endless conveyor, and particles are projected through these slits onto the substantially linear selected portions.

REFERENCES:
patent: 2195810 (1940-04-01), Bower
patent: 3696565 (1972-10-01), Claeys

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