Gear tooth wear and micro-pitting is a very difficult phenomenonto predict analytically. The failure mode of micro-pitting isclosely correlated to the lambda ratio. Micropitting can be thelimiting design parameter for long-term durability. Also, thefailure mode of micropitting can progress to wear or macropitting,and then manifest into more severe failure modes such as bending.The results of a gearbox test and manufacturing process developmentprogram will be presented to evaluate super finishing and itsimpact on micropitting. Testing was designed using an existingaerospace two stage gearbox with a low lambda ratio. All gears werecarburized, ground and shot peened. Two populations were thencreated and tested. One population was finish honed and the secondwas shot peened and isotropic super finished. A standardqualification test was conducted for 150hrs at maximum continuousload. The honed gears experienced micro and macro pitting duringthe test. The Isotropic Super Finishing (ISF) gears were alsotested for 150hr under the same loading. The ISF gears were absentof any surface distress. The ISF gears were further subjected to a2000hr endurance test. The ISF gears had less surface distressafter 2000hr than the baseline honed gears after 150hrs.
- Edition:
- 11
- Published:
- 10/01/2011
- Number of Pages:
- 18
- File Size:
- 1 file , 1.1 MB
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