The invention provides a
machining method of an aircraft engine crankcast. The
machining method can solve the problems that when an existing crankcast
machining method is used, crankcast deformation is large, machining precision is low, the manufacturing period is long, and the machining difficulty is large. The method comprises the following steps of blank dimension re-inspection, rough turning of a large end and a small end, rough milling of shape contour,
stress relief heat treatment, trimming of a large end datum and a small end datum, finish milling of two side faces of a longitudinal installing side and longitudinal installing side holes, segmentation,
grinding and trimming of wire-
electrode cut end faces, pre-assembling, semi finish turning of the large end and the small end, drilling of angular locating holes, semi finish milling of the shape, finish turning of the small end, finish milling of the shape and a small end installing side hole, finish reaming of the longitudinal installing side holes, finish turning of the large end, finish milling of a large end installing side hole, thread tapping,
laser marking, dying check,
fluorescence penetrant inspection and final inspection.