Auxiliary device for processing steam turbine cylinder body

The invention relates to an auxiliary device for processing a steam turbine cylinder body. The auxiliary device comprises a main shaft arranged in two tile mouths of the steam turbine cylinder body; the axial feeding drive and the rotary drive are connected to the end of the main shaft and used for driving the main shaft to drive a cutter installed on the main shaft to conduct axial feeding and rotary motion around the shaft respectively; and the radial feeding mechanism is arranged on the main shaft and is used for driving the cutter to feed in the radial direction. According to the auxiliary device for machining the steam turbine cylinder body, a three-drive linkage driving mode of axial feeding, rotation around the shaft and radial feeding is adopted, machining of the steam turbine cylinder body with small tile openings in the two ends and a large cavity in the middle can be achieved without disassembling the cylinder, the machining precision is high, and compared with a traditional machining technology, t