In order to reduce costs by extending the operational life ofthe sun and input pinion gears of a helicopter transmission,scraped gears were subject to a superfinishing process. Thisprocess was found to remove minor foreign object damage byuniformly removing a minimal amount of material on the gear teeth,while meeting original manufacturing specifications for geometry.The process also resulted in enhanced surface quality and did notexhibit detrimental metallurgical effects on the surface orsub-surface of the teeth. The process was also found to eliminategray staining, an early precursor to pitting. This paper describesthe results of the helicopter gear repair project and includes thegeometry and metallurgical evaluations on the repaired gear.Further effort to characterize the durability and strengthcharacteristics of the repaired gear is ongoing.
- Edition:
- 05
- Published:
- 10/01/2005
- Number of Pages:
- 11
- File Size:
- 1 file , 1.9 MB
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