Environmental requirements for optical lens processing

Because of its high precision and special processing objects, optical lens processing must be carried out in a special optical workshop. Therefore, in addition to complying with the general machining rules, it is also necessary to comply with the safe operating requirements specific to optical machining. In the process of optical parts processing, most processes are sensitive to environmental factors such as temperature, humidity, dust, vibration, and light, especially for the processing of high-precision parts and special parts. Therefore, the optical workshop is closed, and requires constant temperature, constant humidity, limiting air flow, artificial lighting, dust prevention.

Effect of temperature on optical process. Constant temperature is one of the obvious characteristics of optical workshop. This includes two problems of constant temperature and fluctuation range. Due to different requirements in each workplace of the optical workshop, the requirements for constant temperature and its fluctuation range are different.

(1) The effect of temperature on polishing efficiency and quality Because the chemical action existing in the polishing process is intensified with the increase of temperature, the heating will improve the polishing efficiency. However, due to the classical process used in the polishing mold mold glue, bonding glue, etc. are mainly made of rosin and asphalt according to a certain ratio, a certain ratio is only used at a certain temperature. Moreover, they are more sensitive to temperature changes, the temperature is too low, and the consistency between the polishing die and the part is not good; The temperature is too high, and the polishing face of the polishing die is deformed. These two will make the precision of the machined parts difficult to guarantee, specifically in the aperture is difficult to control and modify. It is concluded from practice that the temperature between polishing rooms should generally be controlled at 22℃±2℃.

(2) dust prevention, because optical parts have extremely high requirements for surface quality, that is, surface finish and surface defects, the dust prevention problem of the optical workshop is also particularly prominent. Dust in polishing will cause the surface of parts to produce lines, scratches, bright silk; When coating, the film layer will appear pinholes, spots, fog; It will cause error of line position and broken line when marking. The main sources of dust are: brought in by outside air; Fall from the staff clothing (particle size is generally about 1 to 5μm, diameter of less than 1μm of dust, often can not rely on its own weight to fall, and a long time suspended in the air, affecting product quality); Unclean materials, auxiliary materials, jigs, etc. Dust generated during the production process (optical workshop purification conditions, if according to the weight concentration of indoor dust requirements, should be controlled in the order of mg/m 3. The requirements of the gluing chamber are more stringent, generally taking the particle concentration as the requirement, reaching the order of magnitude of the number of particles/liter).