MANUFACTURING METHOD OF BRUSHES OF ELECTRICAL MACHINES Russian patent published in 2014 - IPC H01R43/12 

FIELD: electricity.

SUBSTANCE: invention relates to electrical brush production, namely to production of brushes for starters, generators and automobile motors with supply voltage of 12 and 24 V. A manufacturing method of brushes of electrical machines involves mixing of filler with a binding agent, crushing, pressing and sintering. Combined grinding of graphite filler with a polymer biding agent is performed in a vibratory mill. A polymer is dissolved in a granulator with ethyl alcohol for preparation of resin-graphite granules. Then, the solvent is dried in a vibrofluidised bed of an infrared drier. After pressing with simultaneous wire pressing, brushes are heated up to 200°C for polymerisation of the binding agent and sintered in a nitrogen medium with addition of hydrogen at 680-950°C.

EFFECT: obtaining homogeneous bulk moulding powder with good compactability, stable particle size composition for manufacture of a strong body of an electrical brush.

2 cl, 1 tbl