A study on the method of quality control by restraining the influence of curvature in curved surface polishing

This paper proposes a method of quality for the uneven removal caused by the change of the radius of curvature in the aspheric surface polishing and finishing. This method uses a polishing disk and a bonnet as polishing devices, two kinds of aspheric parts as workpieces with a concave surface and a convex surface respectively. By deriving the model of pressure and velocity at different positions, the equation between dwell time and curvature radius on the elliptical generatrix of aspheric workpiece could be obtained from the famous Preston equation on polishing material removal. According to the dwell time on the different path points, the movement of the robot could be controlled. In this way, only the dwell time of the path points on the elliptical generatrix needs to be calculated, rather than the entire aspheric surface. By measuring the values of surface roughness in the polishing of concave and convex aspheric surfaces, the experimental results verify that the method could improve the processing efficiency.