The invention relates to the technical field of
drill bit buried hole drilling, and discloses a buried hole
drill bit. The buried hole
drill bit comprises a center rod and a
drill bit body, the center rod and the
drill bit body are coaxial, the center rod is clamped in the middle of the
drill bit body and plays a role in positioning and guiding, a cutter is arranged at the end of the drill bit body, and the inner
diameter of the cutter is matched with that of the drill bit body. A centrifugal weight is arranged behind the cutter, the centrifugal weight and the drill bit body are integrally formed, the buried hole drill bit penetrates into an original drilled hole, the buried hole drill bit rotates at a high speed during working, the center rod prevents a drilling angle from deflecting, and the centrifugal weight generates
centrifugal force to enable the drill bit body and the center rod to be separated. The cutter is used for expanding and drilling an original hole
diameter, the cutter is only used for expanding and drilling, and the requirement for the strength of the cutter is not high. According to the buried hole drill bit, the structure is simple, the working efficiency is high, the cost is low, a drilled hole can be used for
machining a buried hole in a drilled through hole or
blind hole, and the buried hole drill bit has the advantages that the hole burying cost is reduced, and the drill bit is richer in function.