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| Experimental Study on Film Cooling Hole Deburring by Alternating Rotating Magnetic Field |
| LI Kuo, CHEN Yan, ZHANG Zhichao, JIN Wenbo |
| (Institute of Advanced Grinding Technology, University of Science and Technology Liaoning, Anshan 114051, China) |
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Abstract 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.
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2017, 
