MIRROR FINISHING METHOD FOR MAGNETIC DISK SUBSTRATE

摘要

PURPOSE:To permit mirror finishing with high accuracy by using diamond turn working as a mirror finishing method for a magnetic disk substrate subjected to nonmagnetic plating. CONSTITUTION:An aluminum alloy substrate 1 is subjected to the nonmagnetic Ni-P plating 2 to 10-several 10mum as a surface prepn. prior to the mirror finishing of the surface of the magnetic disk substrate. The surface of the plating 2 is thereafter subjected to the diamond turn working of 5-10mum by using a diamond tool 3, then the finished surface forms a specular surface having microscopically regular wave shapes. The treatment required thereafter is merely to clean the surface with a solvent in order to removing cutting oil.