Boring mill grooving cutter tool for machining speed reducer box

The utility model discloses a boring mill grooving cutter tool for processing a speed reducer box body, which comprises a base, a taper sleeve is arranged on the end face of the base, a mandrel is arranged in the taper sleeve, the mandrel is provided with a cone matched with the internal taper part of the taper sleeve, the outer wall of the taper sleeve is in threaded connection with an eccentric shaft, the outer wall of the cone is provided with a groove, one end of the eccentric shaft is positioned in the groove, and the other end of the eccentric shaft is positioned in the groove. When the eccentric shaft is rotated, the eccentric shaft drives the cone to axially move through the groove, so that the cone is positioned and matched with the cone sleeve; one end of the mandrel is connected with a cutter mounting head through a cutter handle, and the mandrel, the cutter handle and the cutter mounting head are coaxially arranged; when different cutter handles are assembled, disassembled or replaced, the eccentr