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| Based on Dowson-Higginson equation, this article obtains minimum film thickness of smooth tooth surface in meshing process. From the beginning of meshing process to its disengagement, the minimum film thickness increases gradually .its inflection point appears between the double teeth-meshing area and the single teeth-meshing area, and its maximum appears when the contact point closes the root of face gear. Using shaper to machine face gear with different module and pressure angle, it analyses backlash for the best minimum film thickness. According to the effect of grinding method to surface topography, the minimum film thickness correction factor is recommended, this paper analyzes minimum film thickness of lubrication in the tooth surfaces considering diverse rough surface. In the range of computing roughness, the minimum film thickness increases while surface roughness increases. The contact point near root in grinding wheel has maximum surface pattern parameter, and the minimum film thickness of this point has the least variation. |
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| Keywords:grinding machining; face gear; surface topography; film thickness; |
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