Investigation on the nonlinear relationship between relative velocity and material removal in bonnet polishing

There has been many models for material removal mechanisms of bonnet polishing (BP) based on the well-known Preston model. However, some experimental investigations have demonstrated that the relationship between process parameters and material removal are not linear at all, especially the relative velocity, which cannot be accounted explicitly by the classical model. Accordingly, in this paper, an analytical model is proposed to investigate the nonlinear relationship between relative velocity and material removal in BP based on the mutual interaction of the slurry, pad and workpiece among the BP interfaces with the micro-contact theory and the tribology theory. Good agreement between the predicted results of proposed model and the experimental data is obtained, and the nonlinear material removal with the change of relative velocity is attributed to the variation of the real contact area.