Deburring unit and cutting machine

A deburring unit for removing burrs from a workpiece with the burrs formed along kerfs cut by a cutting blade, comprising:

• a chuck table that holds the workpiece on a holding surface thereof;
• an ultrasonic horn that emits ultrasonic waves from a lower surface thereof, the lower surface facing an upper surface of the workpiece held on the holding surface;
• a water film forming nozzle configured to supply water to the workpiece held on the holding surface and to form a water film such that the upper surface of the workpiece is covered in its entirety with the water film;
• and
• a controller,
• wherein the controller is configured to cause the ultrasonic horn to come into contact at the lower surface thereof with the water film formed with the water supplied from the water film forming nozzle and to cause ultrasonic vibrations to propagate to the water film, to thereby remove the burrs formed along the kerfs.