The utility model relates to the technical field of
numerical control cutters, in particular to a cutter for
machining high-precision concentric circles. Comprising a cutter
handle and an auxiliary
assembly, the cutter
handle is provided with a threaded
broaching hole and a first water through hole, the auxiliary
assembly comprises a cutter bar and a blade, the cutter bar is provided with a second water through hole and a water guide groove, and during
machining, a main shaft rotates to drive the cutter
handle to rotate, so that the cutter bar rotates for
machining;
water flow enters the first water through hole and the second water through hole, part of the
water flow is directly sprayed out through the second water through hole to flush chips, part of the
water flow is sprayed to one side of the blade through the water guide groove during spraying to flush the blade, the water flow can directly carry heat in the cutter when passing through the first water through hole and the second water through hole, and cooling is achieved. And internal and external cooling is realized with an external cooling
nozzle, so that the
cooling effect of the cutter can be improved during
processing and use, the service life of the cutter is prolonged, the replacement time is prolonged, and the
processing and use cost is reduced.