Grinding forces and the machining of magnesium oxide crystals
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The forces acting on magnesium oxide crystals during a surface grinding operation have been studied as a function of rate of material removal and crystal orientation, using two different conventional grinding wheels.
The results are discussed in terms of the resulting surface and subsurface damage and the geometry of the wheel-workpiece interaction. The results are consistent with the observations that chip formation occurs by plastic flow under a 46-grit alumina wheel, while material is removed completely by brittle fracture under a 100-grit diamond wheel. It is demonstrated that the stress on an individual chip is within an order of magnitude of the theoretical shear strength of the workpiece, thus accounting for the presence of both surface and subsurface plastic deformation.
KeywordsPolymer Brittle Plastic Deformation Shear Strength Material Removal
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