Eyeglass lens end face machining method

摘要

The following was done in order to mechanically polish a bevel face after bevel finishing without manually polishing and thereby speed up the polishing process and improve uniformity of finishing precision, as well as obtain fashionable eyeglasses: That is, a polishing wheel for polishing a bevel with a bevel polishing groove the shape of which essentially matches the bevel faces of the finished lens is used. The bevel is polished in two processes using said wheel. During the first process, the apex position of the bevel in the finished lens is displaced from the bevel-groove center position of the bevel polishing groove in the wheel to the concave side of the lens and the polishing allowance on the concave side of the bevel faces is polished. During the second process, the bevel apex position is displaced to the lens convex side so that the bevel apex position of the finished lens and the center position of the bevel-groove in the wheel match and the polishing allowance on the convex side and from the polishing irregularities that remained after the first polishing process is polished.Moreover, the following was done in order to prevent streaks from being made in the lens by the wheel when the planed end face of the eyeglass lens is polished to a mirror polish; That is, the eyeglass lens, one side of which is convex and the opposite side of which is concave, is pressed to the bevel polishing wheel, which has a bevel polishing groove the shape of which corresponds to the bevel and a polishing face, and the smooth face is polished to a mirror polish. The position of the eyeglass lens in the direction of the X axis is controlled during machining of the and face using the polishing face of the wheel so that the apex position of the end face on the convex side of the eyeglass lens where the surface on the convex side of the eyeglass lens and the end face intersect is the usually the boundary between the flanks that are in series with the bevel polishing groove and the planing and polish face that is in series with said flanks.