Metal working – Method of mechanical manufacture – Electrical device making
Patent
1986-05-12
1988-07-26
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
72377, H02K 1502
Patent
active
047591170
ABSTRACT:
A method of manufacturing a magnetic rotor core member for a rotating-field dynamomoelectric machine, particularly a small alternator, including the steps of: hot forging a segment of steel bar stock into a core blank approximating the external configuration desired for the rotor core member but with the pole piece fingers shorter than required for the finished pole pieces; de-burring the core blank; coining the core blank into closer conformation to the desired core member configuration; gradually cooling the core blank; rough machining only two opposed surfaces of the hub and base to assure a controlled uniform volume for subsequent processing; cold punching a shaft aperture through the hub of the core blank and simultaneously ironing the pole piece fingers into close conformity with the required finished dimensions, in particular lengthening the fingers; and, finally, cold-compressing the core blank to finished form as a rotor core member in a single cold compression step.
REFERENCES:
patent: 3271604 (1962-11-01), Priddy
patent: 4041754 (1977-08-01), Otani
patent: 4558511 (1985-12-01), Kato
Melvin H. Verson, "The Ford Sandusky Project", Nov. 2,3 and 4, 1965, pp. 8-10.
Hall Carl E.
Kato Iron Works, Ltd.
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