METHOD OF COMPACTING ELECTRIC MACHINE BRUSH BILLETS FROM CARBON-BASED POWDERS AND MULTICAVITY MOULD TO THIS END Russian patent published in 2014 - IPC B22F3/02 B22F3/03 B30B15/02 

FIELD: process engineering.

SUBSTANCE: invention relates to powder metallurgy, particularly, to production of brushes from carbon-based powders. Brush workpiece is made in multicavity mould by vertical compaction. After vertical compaction, horizontal reduction force is applied from the side of the bush working end to make 10-15 % of vertical compaction at specific force of horizontal compaction 30-40% larger than specific vertical compaction force. Multicavity mould comprises female die 1, top vertical male die 2, chase 3, fixed male dies 4, set of cavity inserts to male cavities 6 to be filled with powder. Horizontal male die 8 and extra vertical male die 10 are conjugated in inclined surface 9 with inclination angle α=10…15 to the mould vertical axis. This mould incorporates the element designed to return horizontal male die to initial position and composed by resilient element.

EFFECT: higher density and strength, lower specific resistivity.

2 cl, 6 dwg