Tapered deep hole boring device based on double-conical-face principle

The utility model belongs to the technical field of tapered hole machining devices, particularly relates to a tapered deep hole boring device based on a double-conical-face principle, and solves the problems that an existing machining method of a tapered deep hole can not adapt to the situations that the hole is deep and the hole diameter is small. The device comprises a boring bar and a boring cutter, wherein holes are formed in the axial center and along the radial direction of the boring bar, the boring cutter is arranged in the radial hole of the boring bar, a double-conical-face core rod is arranged in the axial hole of the boring bar, the front end of the double-conical-face core rod is provided with two conical face bodies, the conical degree of the two conical face bodies are the same, a floating support is arranged in the boring bar, the tapered hole is arranged in the boring cutter, and the axis direction of the tapered hole is parallel to the axis direction of the boring bar. The tapered deep hole