Optimization of Grinding Conditions of Axisymmetric Aspherical Grinding

Abstract

With the recent increase in the size and image quality of optical equipment, there is a strong demand for higher precision aspherical lenses. Generally, an aspherical glass lens or its mold is formed by grinding and then finished by polishing. Since the shape accuracy deteriorates in this polishing process, it is necessary to keep the polishing amount small. Therefore, it is desirable to optimize the grinding conditions and reduce the grinding surface roughness. In this paper, to optimize the grinding conditions of axisymmetric aspherical surface, maximum height roughness of axisymmetric aspherical ground surface is analyzed theoretically utilizing the statistical grinding theory. From the view point of relationship between the grain cutting direction and workpiece feed direction, grinding can be classified into parallel grinding and cross grinding. And it is found that the parallel grinding is suited to axisymmetric aspherical grinding.