Method for manufacturing amorphous magnetic core
First Claim
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1. A method of manufacturing an amorphous magnetic core comprising the steps of:
- in an uncoiler device, arranging a plurality of amorphous sheets having different degrees of relative magnetic quality to be respectively wound around a plurality of reels;
withdrawing said plurality of amorphous sheets from said reels;
bringing said plurality of amorphous sheets into close contact with one another to form a stack of said amorphous sheets so arranged that the amorphous sheets are stacked in an order of the degree of relative magnetic quality from low to high;
measuring a thickness of said stack and determining a cutting length of said stack with respect to the measured thickness;
cutting said stack in accordance with the determined length to obtain a cut stack of the amorphous sheets;
supplying the cut stack to a rectangular forming mandrel so that the low degree of magnetic quality side of the cut stack of said amorphous sheets is brought into contact with a first surface of said forming mandrel;
fixing the cut stack on the first surface of said rectangular forming mandrel at a predetermined position;
first press-forming the cut stack around the first surface of the mandrel to contact two adjacent side surfaces of said rectangular forming mandrel to form a U-shape block of the cut stack;
securing said U-shape block onto said rectangular forming mandrel;
bending both free end portions of the U-shape block on said rectangular forming mandrel by a second press-forming step to form a closed rectangular block integrally surrounding said forming mandrel;
securing the bent free end portions of the closed rectangular block onto the rectangular forming mandrel; and
annealing said rectangular magnetic core.
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Abstract
An amorphous magnetic core is arranged to be obtained by cutting a plurality of amorphous sheets to have a predetermined cut length by a cutter device and supplying the cut sheets to a rectangularly forming device, the sheets being supplied from an uncoiler device including a plurality of reels around which the sheets are wound, by winding the sheets of a predetermined number around a forming mandrel successively to form them into a rectangular shape, thereby forming the magnetic core, and by subjecting the magnetic core to magnetic annealing in an annealing device.
33 Citations
6 Claims
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1. A method of manufacturing an amorphous magnetic core comprising the steps of:
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in an uncoiler device, arranging a plurality of amorphous sheets having different degrees of relative magnetic quality to be respectively wound around a plurality of reels; withdrawing said plurality of amorphous sheets from said reels; bringing said plurality of amorphous sheets into close contact with one another to form a stack of said amorphous sheets so arranged that the amorphous sheets are stacked in an order of the degree of relative magnetic quality from low to high; measuring a thickness of said stack and determining a cutting length of said stack with respect to the measured thickness; cutting said stack in accordance with the determined length to obtain a cut stack of the amorphous sheets; supplying the cut stack to a rectangular forming mandrel so that the low degree of magnetic quality side of the cut stack of said amorphous sheets is brought into contact with a first surface of said forming mandrel; fixing the cut stack on the first surface of said rectangular forming mandrel at a predetermined position; first press-forming the cut stack around the first surface of the mandrel to contact two adjacent side surfaces of said rectangular forming mandrel to form a U-shape block of the cut stack; securing said U-shape block onto said rectangular forming mandrel; bending both free end portions of the U-shape block on said rectangular forming mandrel by a second press-forming step to form a closed rectangular block integrally surrounding said forming mandrel; securing the bent free end portions of the closed rectangular block onto the rectangular forming mandrel; and annealing said rectangular magnetic core. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification