What are the techniques of optical glass polishing?

Aug. 02, 2019

What are the techniques of optical glass polishing?

Changchun Brdoptial photoelectric technology co., LTD. Is specialized in various optical components, laser optical components, optical coating products. The main production of filters, reflectors, through infrared filters, half mirror, mirror, filter, color filter, splitter, infrared filters, narrow band filter, band pass filter, neutral density filter, optical coated glass, optical filter, optical glass, optical lenses, optical glass. Today, High Precision Optical Glass Dome Manufacturer would like to share about the optical glass polishing technology what skills?

Glass materials such as lenses, prisms, reflectors and Windows used in manufacturing optical instruments or mechanical systems. Including colorless optical glass (usually referred to as optical glass), colored optical glass, radiation resistant optical glass, radiation resistant glass and optical quartz glass, etc. Optical glass has high transparency, high uniformity in chemistry and physics (structure and properties), and specific and accurate optical constants. It can be divided into silicate, borate, phosphate, fluoride and series of sulfur compounds. There are many varieties and they are classified mainly by their position in the index of refraction (nD)- abbe value (VD) chart. Traditionally, all kinds of glasses with nD>1.60, VD>50 and nD<1.60, VD>55 are classified as coronal (K) glass, while other kinds of glasses are classified as flint (F) glass. Corona glass is generally used as a convex lens, flint glass as a concave lens. Generally, coronal glass belongs to alkali borosilicate system, light coronal glass belongs to aluminum silicate system, heavy coronal glass and barium flint glass belong to alkali free borosilicate system, and most of flint glass belongs to lead potassium silicate system. As the field of application of optical glass continues to expand, its variety continues to expand, and its composition includes almost all elements in the periodic table.

An inorganic glassy material that transmits light by refraction, reflection, transmission, or absorption, changing the intensity or spectral distribution of light. It has stable optical properties and high optical uniformity.

1) polishing bath: bath polishing is to point to the artifacts and pads are immersed in the fluid of the polishing, the depth of the schematic polishing liquid to devices used in stationary submerged workpiece 10 ~ 15 mm advisable, agitator is to make the polishing liquid in a suspended state, not precipitation, polishing glass in general use polishing materials such as iron oxide (pretty), alumina.

(2) ion beam polishing: ion beam polishing is a complementary polishing method used to further improve the polishing accuracy of glass workpiece after traditional polishing. First under the condition of vacuum (1.33 Pa), the inert gas (argon and krypton, xenon, etc.) atomic method such as using high frequency or discharge into ions, with 20 ~ 25 kv voltage acceleration, and then crash into a 1.33 x 10 Pa vacuum degree of vacuum indoor processed workpiece surface, the energy directly to the workpiece material atoms, make its escape surface and has been removed. This method can make the workpiece removal thickness up to 10 ~ 20 microns, which is a typical polishing technique by physical collision method, the surface roughness can reach 0.01 microns in general, and the precision is up to 0.6nm.

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(3) plasma assisted polishing: plasma assisted polishing is the use of chemical reaction and the realizing methods of polishing to remove the surface material, USES the specific gas, made active plasma, when the activity of plasma and surface effect, produces chemical reaction, generate a mixture of volatile gases, so as to remove surface material. The hardness of the abrasive must be greater than that of the glass, because the mechanical action is predominant when the glass is ground. Optical glass and daily glass grinding allowance is large, so generally used corundum or natural emery grinding efficiency is high. The grinding allowance of plate glass is small, but the area is large, the quantity is much, generally using cheap quartz sand. Commonly used polishing materials are red powder (iron oxide), cerium oxide, chromium oxide, zirconia, thorium oxide, and other daily glass processing also use feldspar powder.

The new polishing technology of High Precision Optical Glass Dome products is not suitable for the traditional grinding and polishing methods of optical glass processing from the aspects of precision and efficiency. Currently developed many new processing technology, such as CNC grinding and polishing technology, ion beam polishing technology, stress plate polishing technology, ultra smooth surface machining technology, ductile grinding machining, elastic emission polishing method, laser polishing, vibration polishing, etc., these new techniques, fully meet the demand of the rapid development of optical field. The new processing technology of optical lens is tested and corrected at the same time, which not only has high processing accuracy, but also improves the processing speed by several times to dozens of times. It has little dependence on artificial technology, and the new grinding and polishing technology has high intelligence degree and high repetition precision. CNC grinding and polishing, stress disc polishing technology, specifically for the processing of spherical and aspheric optical lens, very professional.

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