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• Time of issue:2021-06-24
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(Summary description)Detailed description of optical cold working process data (process aging)

1. Polishing powder

1.1 Requirements for polishing powder

A. Granularity should be uniform, hardness should be slightly harder than polishing materials;

B. Polishing powder should be pure and free from impurities that may cause scratches;

C. It should have certain lattice form and defect, and have appropriate self-sharpness;

D. It should have good dispersibility and adsorption;

E. Good chemical stability, will not corrode the workpiece.

1.2 Types and properties of polishing powder

Common polishing powder has cerium oxide (CeO2) and iron oxide (FeO3).

A. Cerium oxide polishing powder particles are polygonal with obvious edges and angles, with an average diameter of about 2 microns, Mohs hardness of 7 ~ 8 and specific gravity of about 7.3. Due to the manufacturing process and the different content of cerium oxide, cerium oxide polishing powder has white (content of 98% or more), light yellow, brown yellow and so on.

B. Iron oxide polishing powder, commonly known as red powder, is spherical, particle size is about 0.5 ~ 1 micron, Mohler hardness is 4 ~ 7, specific gravity is about 5.2. The colors range from yellowish red to deep red.

To sum up, cerium oxide has a higher polishing efficiency than red powder, but red powder is better for parts requiring high surface finish.

2. Polishing mold layer (underlying) material) commonly used polishing mold layer material polishing

Glue and fiber materials.

2.1 polish glue

Polishing adhesive, also known as polishing tar, is made up of rosin and asphalt in different proportions, used for precision polishing of optical parts

2.2 Fiber Materials

In the polishing of optical workpiece, if the surface shape accuracy (aperture) of the polishing surface is not high, the long use of wool, felt and other fiber material as the material of polishing mold layer.

3. Common test instruments

Some quality indexes of optical parts, such as radius of curvature of lens and Angle of prism, need to be measured by special measuring instrument. The commonly used instruments are: optical comparator side Angle instrument, laser plane interferometer, ball diameter instrument and knife edge instrument, etc.