Machining method of porous thin-wall fan cases and work-piece locating tool

The invention discloses a machining method of porous thin-wall fan cases and a work-piece locating tool. The machining method of the porous thin-wall fan cases is high in machining efficiency and machining stability, and the tool is convenient to use. The machining method comprises the steps of roughly machining cavities of work-pieces; precisely machining the cavities of the work-pieces; machining threaded holes; roughly machining the peripheral contours of the work-pieces; uniformly coating the surface, making contact with the work-pieces, of the tool with fine gypsum powder with the thickness being 0.15 mm, slowly sleeving the tool with the cavities of the work-pieces and discharging the redundant gypsum powder between the tool and the work-pieces through the gap between the tool and the work-pieces; tensioning the work-pieces from the bottom surface of the tool through screws, and fixing the work-pieces through the friction force between the bottom surfaces of the work-pieces and the top surface of the tool; precisely machining the peripheral contours of the work-pieces; precisely machining the peripheral contours of the work-pieces again. By adopting the machining method, the clamping time of the work-pieces is shortened, machining deformation of thin-wall parts is controllable, the machining efficiency is high, and the machining stability of the thin-wall parts is improved.