Manufacturing method of metal graphite brush for DC motor

摘要

The present invention relates to a method for manufacturing a metal graphite brush for a DC motor, and in the related art, as the binder inside the brush is carbonized, components other than carbon evaporate to remain as pores, thereby increasing the resistivity of the brush and increasing the bonding force between graphite particles or copper particles. There was a problem of dropping the wear resistance of the brush.;Accordingly, the present invention is a kneading step of mixing the binder in the graphite powder, a heating step for curing it, a grinding step to have a predetermined particle size, a press molding step of mixing the copper and additives to form a molded body, plastic deformation By the heat treatment step and impregnating the molten tin (Sn) in the pores of the molded body to reduce the specific resistance of the brush and increase the bonding strength between the graphite particles or copper particles to obtain the effect of improving the strength of the brush have.