Boring cutter

The boring tool comprises a tool body, the tool body is provided with a plurality of cutting tool bits, the tool body is provided with a chip groove, the tool body is provided with a main channel and liquid outlet channels corresponding to the cutting tool bits one to one, one end of each liquid outlet channel is connected with the main channel, and the other end of each liquid outlet channel penetrates through the groove wall of the chip groove. The extending direction of the liquid outlet channel is aligned with the cutting tool bit. When some workpieces with small hole diameters are machined, a cutting tool bit and a cutting part can be effectively cooled, and the problem that the cutting part cannot be cooled due to the fact that a traditional cooling mode does not have enough space to enable a liquid spraying pipe to stretch into a hole along with a boring tool is solved. 本发明一种镗孔刀具，包括刀具本体，刀具本体设置有若干个切削刀头，刀具本体上设置有排屑槽，刀具本体上设置有主通道和与切削刀头一一对应的出液通道，出液通道的一端与主通道相连，出液通道的另一端贯通排屑槽的槽壁，出液通道的延伸方向对准切削刀头。本发明在加工一些孔径较小的工件时