There are many points for attention in the processing of optical Shi Ying glass:

First, the raw material processing stage

Inspection and cleaning

Before processing, Shi Ying glass raw materials need to be carefully inspected. Check whether there are surface cracks, bubbles and other defects. Because these defects may expand during processing, resulting in material scrap. For example, even tiny surface cracks may break the glass due to stress concentration during subsequent cutting or grinding.

Cleaning is also crucial. Shi Ying glass surface should avoid dust, oil and other impurities. You can use professional cleaners and soft wiping tools, such as dust-free cloth, for cleaning. Because impurities may scratch the glass surface during processing and affect the optical performance.

Second, the cutting process

Cutting tool selection

Choose the right cutting tool. For optical Shi Ying glass, diamond tools are usually used. Because of the high hardness of Shi Ying glass, the hardness of diamond tool is enough to effectively cut it. Moreover, the cutting edge quality of diamond tools is better, and the flatness and sharpness of the cutting edge directly affect the quality of the cutting surface.

Tool wear also needs attention. With the cutting process, the tool will gradually wear, and the worn tool may lead to rough cutting surface or edge collapse. Therefore, it is necessary to regularly check the degree of tool wear and change the tool in time.

Cutting parameter control

Cutting speed is an important parameter. Too fast speed may lead to thermal stress on the glass surface, causing glass to break; Too slow speed will affect the processing efficiency. For example, when cutting Shi Ying glass with CNC cutting machine, the cutting speed is generally controlled between several millimeters and tens of millimeters per minute, and the specific speed should be determined according to the thickness of the glass and the performance of the cutter.

The cutting depth also needs precise control. Too deep cutting depth may cause uneven cutting surface, and too shallow cutting depth will increase cutting times and processing cost.

III. Grinding and polishing process

Grinding materials and technology

The choice of grinding materials is very important. For optical Shi Ying glass, grinding materials such as silicon carbide and alumina are generally used. The granularity of these materials should be selected according to the grinding stage. In the rough grinding stage, abrasive materials with large granularity can be used to quickly remove the surplus; In the fine grinding stage, materials with smaller granularity, such as micron-sized alumina particles, should be used to improve the flatness of the grinding surface.

The grinding process is also particular. When grinding, the flatness of the grinding disc should be ensured, and the grinding trajectory should be uniform. For example, the use of planetary grinding trajectory can make the glass surface more uniform. At the same time, it is necessary to control the grinding pressure. Too much pressure may lead to scratches or local deformation on the glass surface, while too little pressure will lead to low grinding efficiency.

Polishing points

Polishing is a key step to improve the optical properties of Shi Ying glass. The polishing material usually adopts cerium oxide and the like. During polishing, it is necessary to ensure that the concentration of polishing solution is appropriate. If the concentration is too high, it may cause corrosion on the glass surface, while if the concentration is too low, the polishing effect will be poor.

The speed and time of polishing should also be controlled reasonably. If the speed is too fast or the time is too long, the glass surface may be over-thrown, which will lead to the decline of surface quality; If the speed is too slow or the time is too short, the ideal optical flatness and smoothness cannot be achieved.

Fourth, cleaning and quality inspection

Precautions for cleaning

The processed Shi Ying glass needs to be thoroughly cleaned. Because impurities such as grinding materials and polishing solution will remain during grinding and polishing. Use pure deionized water when cleaning to avoid impurities in the water from polluting the glass again.

Ultrasonic cleaning can be used to improve the cleaning effect. The frequency and time of ultrasonic cleaning should be determined according to the size and pollution degree of glass. For example, for small optical Shi Ying glass lenses, the ultrasonic cleaning time can be controlled between several minutes and ten minutes.

Quality inspection link

Strict quality inspection is required for optical Shi Ying glass after processing. The main detection indexes include surface smoothness, smoothness and optical transmittance. Surface flatness can be detected by interferometer, and smoothness can be evaluated by atomic force microscope and other equipment.

For the detection of optical transmittance, a professional spectrometer should be used. In the process of testing, the stability of the testing environment should be ensured to avoid environmental factors (such as temperature, humidity, etc.) affecting the testing results.