Milling cutter arbor of facing cutter

The utility model discloses a milling cutter arbor of a milling cutter disc, and belongs to the technical field of machining. Comprising a milling cutter rod, a positioning shaft, an external thread column, a positioning key, a pressing ring and a nut, the positioning shaft is arranged at the front end of the milling cutter rod, a key groove is formed in the side wall of the positioning shaft, the positioning key is arranged in the key groove, the external thread column is arranged at the front end of the positioning shaft, the pressing ring is sleeved on the external thread column, and the nut is screwed into the external thread column through threads. The milling cutter arbor is adaptive to more milling cutter discs with small diameters through the mode of the inner positioning keys, so that various milling cutter discs can be quickly replaced after the milling cutter arbor is mounted on a milling machine, the mounting mode is simple, and the processing and production efficiency is improved. 本实用新型公开了一种铣刀盘的铣