Research on machining topography of point grinding based on correlation function method

Point grinding uses the point contact to shape surface topography of workpiece which has high machining precision. Its surface topography has a close relation with its service performance. In order to study the topography of point grinding, these authors carried out the experiment and established a new assessing model based on the correlation function method. The inner characteristics of topography are revealed by self-correlation and mutual correlation function method and its mechanism is analyzed. The study shows that the topography of point grinding has obvious periodical portions, which means it is consistent and uniform. The mutual correlations of every direction show the surface topography of point grinding is isotropic. Point grinding surface has better consistency under larger included angle and smaller grinding depth. And it has better isotropy under larger included angle. Surface roughness has the opposite rule from the consistency and isotropy. The influence of point grinding angle on surface topology is much larger than grinding depth