After processed by electrical discharge machining (EDM)

the film cooling hole of aircraft engine blade was surrounded by burr. It is difficult to remove the burr by using the method of traditional polishing. Using rotating electromagnetic field to drive the tiny magnetic pin rotating and collide with film cooling holes can effectively remove the burr which on the edge of film cooling holes.The principle of magnetic abrasive finishing (MAF)

the motion trajectory of magnetic pin during in MAF

and the influence factor of magnetic abrasive machining efficiency ware theoretically analyzed. Then the film cooling hole of blade was accomplished in the MAF experiment. The surface topography of the film cooling hole before and after polishing by the 3D depth of field electron microscopy is observed and recorded. The result shows that using magnetic abrasive finishing could achieve a good effect on removing burr on film cooling holes

improve the surface morphology and meet the requirement and precision.