Spinning cutter for inner hole of part

The part inner hole spinning cutter comprises an outer shell, a locking nut and an inner shell, the outer shell, the inner shell and the locking nut are each of a cylindrical structure with an opening formed in one end, the inner shell is coaxially arranged in the outer shell, the outer diameter of the inner shell is matched with the inner diameter of the outer shell, and the locking nut is arranged in the outer shell. The opening direction of the inner shell is consistent with that of the outer shell, one end of the opening of the inner shell extends out of the outer shell, the locking nut is arranged opposite to one end of the opening of the outer shell, the outer shell is sleeved with the locking nut, the locking nut is in threaded connection with the outer shell, and the inner shell is just fixed in the outer shell through the locking nut; and one end of the mandrel penetrates through the via hole and is connected into the inner shell, a first mounting hole is formed in the other end of the mandrel, and t