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US 4,369,077 AGranted
Method of manufacturing an electromagnetic core
AssigneeFuji Electric Co., Ltd.
InventorShigemasa Saito
Life of this patent
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Abstract
A method of manufacturing stationary electromagnetic cores utilizes mild steel having a carbon content of up to 0.01% by weight and an impurity content of less than 0.31% by weight. Use of this material lowers the cost of manufacturing electromagnetic cores by shortening the drawing process and obviating the necessity for magnetic annealing.
Claims9
A method of manufacturing an electromagnetic core material comprising the steps of:
- (a) hot-drawing a wire rod of mild steel containing about 0.01% or less by weight of carbon and an impurity content of less than about 0.31% by weight;
- (b) cold-drawing the hot-drawn wire rod;
- (c) annealing the cold-drawn wire rod;
- and
- (d) finish-drawing the annealed wire rod at a work rate of about 10% or less.
2 more elements
Dependencies are inferred from the claim text.