Basic Requirements And Surface Properties Of Edging Agents In Optical Glass Processing
Optical glass corrosion and its appearance Optical glass water resistance and resistance to the surrounding environment Acid, alkali and other different media erosion, mainly depends on the optical glass chemical stability, which is different from the composition of the composition of the optical glass and SiO2 content. It is appropriate to add the polishing solution during the polishing process. Too little Participation in the ability to reduce the polishing powder particles and reduce the polishing efficiency. Too much, some polished particles do not participate in the work, but also bring a lot of liquid to the glass side of the temperature drop, affecting the polishing efficiency. The basic requirements and surface properties of edging glue in optical glass processing:
(1) Centering chuck geometry axis and the machine spindle coincidence accuracy should be more than the centering accuracy, generally 0.003 ~ 0.005 mm; this is a lot of use in the infrared optical glass.
(2) The center of the centering chuck should be strictly perpendicular to the geometry of the chuck; the precision of the optical glass lens depends on this.
(3) centering the chuck side of the two edges should be geometric axis concentric circles, the formation of thin and equal thickness of the circumference, the surface after grinding and polishing, so as not to scratch the lens;
(4) the center of the chuck should be smaller than the diameter of the lens after the center is 0.2 to 0.5 mm; store a few days or more than 10 days to facilitate the operation of the parts and the next process processing. After polishing the plate, and then make a number of additional protective measures, more reliable. (5) Select the direction of inclination of the center of the center chuck according to the surface shape (convex, flat, concave) of the centering chuck. In addition, in order to avoid the centering chuck heating and the lens pressure, chuck to have ventilation holes.
Optical glass is widely used, the concentration is too high, that is, less moisture, affecting the polishing pressure, polishing powder can not quickly walk evenly, resulting in various parts of the pressure range, resulting in local multi-grinding, the polishing of the aperture (stripes) quality. And the pressure per unit area is reduced, the efficiency is reduced, the debris produced in the polishing process can not be successfully ruled out, so that the workpiece surface rough. Generally, when the polishing is started, the polishing solution is slightly thicker, and when it is finished, the polishing solution is light and the number of times is small, which is advantageous for improving the polishing efficiency and finish. In addition, it is generally believed that the acidity (pH) of the polishing solution should be controlled between 6 and 8, otherwise the glass surface will be corroded and affect the surface finish.