The invention belongs to the field of hole
machining, and particularly relates to a spray-suction type hole
machining method which is used for improving hole
machining capacity and quality. One part of
cutting fluid flows to a
cutting edge part, and the other part of the
cutting fluid is obliquely sprayed backwards. A plurality of wedge-shaped protrusions are arranged on a
drill bit along the circumference, the wedge-shaped protrusions and the inner wall of a machined
deep hole form a wedge-shaped space, and a wedge-shaped
oil film is formed when oil flows through the wedge-shaped space. The distance between the wedge-shaped protrusions and the inner wall of the machined
deep hole is very small or equal to zero. Self-centering force of the
drill bit is finely adjusted through an adjustingcushion block, a positioning piece and a screw rod as required. The length of the
drill bit is larger than that of a
drill bit of an existing corresponding spray-suction drill. The machining method comprises the steps that firstly, a spray-suction drill
system and the
drill bit thereof are assembled; secondly, the spray-suction drill
system, the
drill bit and a workpiece are installed on a machinetool; and thirdly, the drill bit is rotated, and the
cutting fluid is brought into the wedge-shaped space. The force of the liquid is large, and
estimation is convenient. The drill bit is high in self-centering precision and good in self-correcting effect. The precision of a cutter
system is easy to guarantee, and high-speed rotation can be achieved.