The utility model relates to the field of carbon
brush processing, and particularly discloses a pre-
grinding device for a junction surface of a carbon
brush and a
commutator, which comprises a motor, a motor clamping plate, a motor fixing block, a
grinding wheel connecting rod, a
grinding wheel, a tool side plate, a guide key, a carbon
brush square box and a bottom plate, the motor fixing block is fixed on the bottom plate, and the motor is clamped by the motor clamping plate and installed on the motor fixing block. One end of the
grinding wheel connecting rod penetrates through the motor fixing block and is connected with the motor, the
grinding wheel is installed at one end of the
grinding wheel connecting rod, the guide key is fixed to the bottom plate and is perpendicular to the length direction of the grinding wheel connecting rod, the tool side plate is installed on the bottom plate and located on one side of the grinding wheel, and a guide groove is formed in the bottom of the tool side plate. The carbon brush square box is installed on the tool side plate, traditional waterproof
abrasive paper is replaced with the grinding wheel for grinding, the grinding efficiency can be improved, the carbon brush with the
radian can be ground, and the running-in time of the carbon brush and a motor is omitted.