The invention discloses a method for
machining a
bottle-shaped shaft of a large pumped storage generator motor, and belongs to the technical field of
motor shaft machining. The method is characterizedby comprising the following steps of a, boring a matching hole of the center of a large end and a transition connecting plate; b, turning an outer circle and a
welding groove of the transition connecting plate, and assembling and
welding the transition connecting plate into a shaft center hole in the large end of the
bottle-shaped shaft; c, mounting a process dummy shaft at the large end of the
bottle-shaped shaft; d, turning the process dummy shaft; e, on a working platform of a
numerical control boring
machine, erecting and installing the process dummy shaft to be parallel to the numericalcontrol boring
machine by using angle iron, pressing a workpiece, checking by using a
height gauge according to a line, pressing a gauge on the lower side surface of the machined groove by using a dial gauge, moving the
machine tool away along an X axis, checking by using the
height gauge according to the line, and
machining a
magnet yoke key groove to obtain a bottle-shaped shaft finished product. The chuck precision of a horizontal lathe does not affect the rotation center of the bottle-shaped shaft, the machining difficulty is reduced, the machining stability is guaranteed, the machining precision is improved, and machining operation is more convenient.