Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5015783 | International Journal of Machine Tools and Manufacture | 2017 | 44 Pages |
Abstract
Micro-slot grinding (MSG) is an important processing method for the micro-machining of hard brittle crystalline materials. Modelling the MSG of crystal material is necessary to understand its precision micro-machining aspects. In this paper, a predictive model is developed for the grinding force in MSG in three different orientations of single crystal sapphire: the C-orientation {0001}, A-orientation {112¯0} and R-orientation {11¯02} are established. The crystalline effects of the density of Al+, âAl+ and DAl+; the density of Oâ hollows DOâ; the number of crystal layers ζ; and the weak shape of different orientations are incorporated. Three group experiments (144 paths) are performed, and the differences in the grinding forces from three orientations, {0001}, {112¯0} and {11¯02}, are discussed. The grinding forces of the A-orientation {112¯0} are higher than of the other two orientations {0001} and {1102¯}, and the number of crystal layers ζ is shown to play a vital role in determining the grinding force required for MSG of sapphire. The force ratio rF (Fx/Fy) is between 0.6 to 0.8, and the rF of {1102¯} is more stable than for the {112¯0} and {0001} orientations. A comparison with existing models and experimental data shows that the model used in this study fits the experimental data better, especially at lower feeding rates.
Keywords
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Physical Sciences and Engineering
Engineering
Industrial and Manufacturing Engineering
Authors
J. Cheng, J. Wu, Y.D. Gong, X.L. Wen, Q. Wen,