High degree of accuracy and surface roughness of the mirror at the same time the requirements of a growing demand for processing

Recently, the ceramics, semiconductors, and optical glass as the representative of brittle materials have become increasingly demanding precision, especially high degree of precision and mirror surface roughness also requires processing needs are growing, this abrasive wheels is known as ultra-precision mirror finish. For the semiconductor substrate, and computer hard drives and other parts of simple geometry, usually after the first  cutting tools , polishing processing methods. But for the outer cylindrical surface and complex aspherical mirror ultra-precision machining, grinding process must also meet the high shape accuracy and small surface roughness of the dual requirements.