Cutter arbor of interchangeable tool bit formula drill bit

The utility model relates to a cutter arbor of interchangeable tool bit formula drill bit. Still do not have a structural design equitable at present, the machining precision is high, rotates steadily, and the tool bit clamping is convenient, firm, and the tool bit can be given up, long service life's drill bit cutter arbor. The utility model discloses a cutter bar body, the last chip groove that is provided with of cutter bar body, its characteristics lie in: cutter bar body's front end is provided with a boss and no. Two bosss, is provided with a supporting plane and a set screw hole on the boss, and the axis and a supporting plane in a set screw hole are perpendicular, are provided with no. Two supporting planes and no. Two set screw holes on no. Two bosss, and the axis and no. Two supporting planes in no. Two set screw holes are perpendicular, forms the blade groove between a supporting plane and no. Two supporting planes, and the bottom in blade groove is provided with the locating hole. The utility model has the advantages of reasonable structure design, the machining precision is high, rotates steadily, and the tool bit clamping is convenient, firm, and the tool bit can be given up, long service life.