Commutator ring manufacturing method and apparatus

Metal working – Method of mechanical manufacture – Electrical device making

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72354, 72370, H01R 4306

Patent

active

046113916

ABSTRACT:
A method for manufacturing commutator segmental rings, in which ring-shaped blanks (1) are transformed into commutator segmental rings. The method is carried out with a forming apparatus which uses a ring-shaped die (21) and a rib-forming die (25) to transform the blank (1) into a commutator segmental ring (2) with a flange (4) on its end and a shaft portion (3) with commutator segments (5) and cross pieces (7) connecting them. During the forming process, the die (25) moves against the force of an adjustable elastic counter-pressure apparatus (16; 13, 17, 19; 28). The counter-pressure on the facing side (24) of the upper punch (22), on which the die (25) fits, minimizes formation of a burr on the workpiece, and it permits use of a fastening means of reduced clamping power, thereby according the die (25) a greater pressure stability.

REFERENCES:
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patent: 3608350 (1971-09-01), Yamaguchi
patent: 3664012 (1972-05-01), Wilke et al.
patent: 3708872 (1973-01-01), Ohuchi et al.
patent: 3768295 (1973-10-01), Cudzik
patent: 3958326 (1976-05-01), Matsumoto et al.
patent: 4299112 (1981-11-01), Kondo et al.
patent: 4463590 (1984-08-01), Theobald

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