The utility model relates to the technical field of conical reamers, in particular to a high-precision straight shank Morse conical
reamer which comprises a straight shank, a
reamer body and a positioning shaft, the
reamer body is conical, a reamer groove and a
chip groove are formed in the reamer body, a blade is arranged on the reamer groove, the cross section of the blade is in a
parallelogram shape, and the positioning shaft is arranged on the straight shank. An inclined surface matched with the blade is arranged at the bottom of the cutter groove; a liquid inlet hole is formed in the side, close to the straight
handle, of the cutter body, a liquid outlet hole is formed in the position, located in the
chip discharging groove, of the cutter body, a liquid spraying hole is formed in the positioning shaft, and the liquid inlet hole is communicated with the liquid outlet hole and the liquid spraying hole. The liquid inlet hole, the liquid outlet hole and the liquid spraying hole are formed in the reamer body, cooling liquid is evenly and reliably thrown to the
contact position of the blade and a workpiece by means of rotation of the reamer, cooling is carried out, the reamer is prevented from being locked, the
machining reliability of the reamer is improved, and the reaming
machining precision is ensured.