Research on sub-surface crack depth in surface grinding for optical glass K9 based on grinding speed

According to the collaborative analysis of grinding parameters,the surface grinding experiment for optical glass is carried out based on the single factor of grinding speed while the abrasive paths are kept consistent.The damage depth of sub-surface crack layer is detected by specimen angle polishing and SEM,which shows that damage depth of the sub-surface crack layer decreases with the increase of the grinding speed.When the grinding speed increases from 500 r/min to 2500 r/min,the average value of the maximum subsurface crack layer depth drops to about 25 μm.The results of grinding experiment for optical glass show that grinding speed is an important factor to the damage depth of the sub-surface in grinding process,which has important influence on the formation of sub-surface crack.