Automatic cutter for machining hole parts

The invention discloses an automatic cutter for machining hole parts, relates to the technical field of part hole machining, and mainly aims to solve the problem that a scratch is left on the wall of a machined hole when an existing drilling and boring cutter retracts. The main structure comprises a power main shaft, a fixed tool apron, a movable tool apron and a tool bit, two sliding rails which are in radial sliding connection with the end face of the fixed tool apron are arranged in the middle of the end face of the movable tool apron, a driving sliding block is arranged between the two sliding rails, a pull rod is arranged in the power main shaft, one end of the pull rod is connected with a driving mechanism, and the other end of the pull rod is connected with the tool bit. The other end of the sliding rail is provided with an inclined driving clamping groove matched with the driving sliding block in a clamping mode, and the inclined driving clamping groove extends towards one end of the sliding rail. Acc