Metal working – Method of mechanical manufacture – Electrical device making
Patent
1974-09-03
1976-05-25
Lanham, C. W.
Metal working
Method of mechanical manufacture
Electrical device making
29609, 72354, 72355, 72363, 72393, H02K 1500
Patent
active
039583252
ABSTRACT:
Annular metallic blanks which consist of packages of interconnected laminae or of sheet metal strips which are coiled edgewise and whose strata are riveted or otherwise secured to each other are converted into stators for electrical machines by cold forming between upper and lower dies and outer and inner calibrating members so that the inner diameter of each blank is increased during cold forming, that the peripheral surface of the stator has two cylindrical portions flanking a convex median portion, and that the outermost portions of the end surfaces of the stator are formed with annular recesses. Prior to cold forming, each blank is subjected to a preliminary shaping treatment including chamfering the axial ends of its internal and peripheral surfaces.
REFERENCES:
patent: 3298218 (1967-01-01), Gollwitzer
patent: 3497949 (1970-03-01), Salt
patent: 3665593 (1972-05-01), Savage
patent: 3706120 (1972-12-01), Bulgrin
patent: 3762041 (1973-10-01), Bair
patent: 3831268 (1974-08-01), Boyd et al.
patent: 3834013 (1974-09-01), Gerstle
patent: 3842493 (1974-10-01), Ohuchi et al.
Busch Rolf
Luders Rudeger
Mann Werner
Renz Klaus
Rick Manfred
Crane Dan C.
Lanham C. W.
Robert Bosch G.m.b.H.
Striker Michael J.
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