Thin-wall step type lining machining method

The invention belongs to the technical field of aero-engine accessories, and particularly relates to a thin-wall step type bush machining method. Comprising the following steps of blank surface turning, cylinder inner circle finish turning, step edge finish turning, surface cyaniding to improve hardness and abrasion resistance, cylinder end face grinding away from the step edge, cylinder outer circle finish turning, stress relief treatment and step edge end face hole drilling. Milling a step edge lace, finely trimming an outer circle, finely turning the end face of a step surface, drilling a radial small hole in the middle of a cylinder, carrying out clamp trimming, magnetic powder inspection, cleaning, rust prevention, plating, replacing a new lining and assembling the new lining to a casing shell, and carrying out combined machining after assembling. After the technical scheme is optimized, the machining quality of the lining can be guaranteed, and efficient installation can be supported. 本发明属于航空发动机配件技术领域，具