FIELD: process engineering.
SUBSTANCE: invention relates to cold-drawing of electrical profiles from whatever bronzes that can not be thermally hardened. Proposed method comprises multipass drawing of metal. Said multipass drawing is carried out with accumulation of cold-work metal hardening and buildup of total drawing factor in passes. Note here that said factor is set for first pass equal to 1.28-1.36, while for second and next passes it is set to make 1.17-1.22.
EFFECT: hardness of commutator bar from cadmium bronze increased to 1200…1250 MPa.
1 dwg
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