Focus on challenging optical components

Make optical lens is the optical glass lenses, generally refers to can pass through and adjustment of the optical lens, optical lens must go through optical instrument measurement, test purity,

by:ChangHui     2020-05-26
Optical lenses after grinding fluid fine grinding, the surface is about 2-3 m thick layer cracks, in order to eliminate the crack layer method is the polishing. Polishing and grinding mechanism of the same, only the tool material and its use polishing liquid ( 浆) Different, polishing, flannelette (of materials 布) , polishing skin ( 聚氨酯) And asphalt ( 球场) , usually to achieve high precision polished surface, commonly used materials for advanced polishing asphalt. Today we talk about optical lens polishing process requirement: 1, the polishing powder materials, usually by cerium oxide polishing powder, alumina, silicon oxide, ferric oxide, zirconium oxide, chromium oxide components composition, different materials of different hardness, chemical properties are different in the water, thus different using occasions. Mohs hardness of 9 alumina and chromium oxide, cerium oxide and zirconia as 7, iron oxide is lower. The chemical activity of the cerium oxide and silicate glass is higher, the hardness is also quite, so it is widely used in optical glass polishing. In order to increase the cerium oxide polishing speed, usually join fluorine in cerium oxide polishing powder to increase the rate of grinding. Contain low amounts of cerium mixed rare earth polishing powder mixed with 3 - usually The fluorine; Pure cerium oxide polishing powder usually contains no fluoride. For the government or the F series of glass, because itself hardness is small, and the fluorine content of the material is higher, so as not containing fluorine is polishing powder as well. 2, cerium oxide particles, the greater the particle size of cerium oxide, the grinding force, the greater the more suitable for the harder materials, the government should use thinner glass polishing powder. Note that all of the distribution of particle degree of the cerium oxide has a problem, the size of the average particle size or the median diameter D50 only determines the speed of the polishing speed, and the largest size determines the on3dmax polishing accuracy of optical cold working production operation. Therefore, in order to get high precision requirements, must control the maximum particle polishing powder. 3, the hardness of polishing powder, polishing powder's real hardness is related to materials, such as the hardness of cerium oxide is mohs hardness around 7, all sorts of cerium oxide are the same. But to feel different cerium oxide body hardness is different, because usually for aggregate cerium oxide polishing powder. Of course, some polishing powder adding alumina harder materials, such as grinding rate and the wear resistance will increase. 4, polishing slurry concentration: in the process of polishing slurry concentration determines the polishing speed, the higher the concentration, the greater the polishing speed. When using small particles polishing powder, pulp concentration should be recalibrated. In the process of optical lens polishing must pay attention to the situation on the surface of the lens and precision inspection at any time. Lens surface defect inspection, because the process of detection is judged by personal vision and method, so the examiner to scratch and sand hole specification have in-depth understanding of, want to often scratch with sand hole standard template, in order to ensure the correctness of the test.
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