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AGMA 12FTM20:2012 Edition

AGMA 12FTM20:2012 Edition

$14.30

The Effect of the Surface Profile on Micropitting

Published By Publication Date Number of Pages
AGMA 2012 15
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A wide choice of surface roughness parameters is available to characterize components, such as gears or bearings, with the goal of predicting the performance of such metal­to­metal contacting parts. Commonly in industry, the Roughness Average (Ra) or the Mean Peak­to Valley Height (Rz (DIN)) is chosen to calculate the Specific Film Thickness Ratio for both superfinished and honed surfaces. However, these two surface roughness parameters fail to adequately predict the performance properties of surfaces that are superfinished or surfaces that are honed. In this paper, a superfinished surface is defined as a planarized surface having a = 0.25 mm Ra. A honed surface is not considered to be planarized, even with a finish of = 0.25 mm Ra. Thus, one is falsely led to predict that a planarized surface or a honed surface, having an equivalent Ra or Rz, will perform similarly. Nothing is further from the truth. Experimentally, an isotropic planarized surface delivers superior performance. The following discussion utilizes another roughness parameter, 3s50

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