Glass is an ancient building material that appeared as early as ancient Egypt. With the common development of human society, the glass industry has created various types of glass with unique functions, which has led to the continuous prosperity of the glass family, such as bulletproof glass, photoelectric glass, vacuum glass, sapphire glass, etc., all of which play an irreplaceable role. Play a role in their respective fields. The following will introduce the polishing and grinding methods of sapphire mobile phone mirrors, and explain the characteristics of grinding techniques.

1. Polishing method

The grinding of sapphire phone mirrors is divided into rough grinding, fine grinding, and fine grinding.

① Rough grinding: Use larger grit abrasives to grind off the rough surface of glass or residual glass on the surface of the product during molding, and remove most of the blank residue. The achieved effect should maintain a rough geometric shape;

② Fine grinding: Fine grinding is a step of polishing based on rough grinding. The result is exactly the opposite of precision grinding, which can maintain more accurate geometric shapes and fine crack heights.

③ Polishing: Polishing is the process and part of achieving an optical surface. During the entire polishing process, it is possible to remove the broken layer left by fine and coarse grinding as much as possible to achieve the desired optical surface effect.

2. Grinding process

Sapphire is aluminum oxide with a hardness of 9. Ordinary abrasives are difficult to process, so diamond is generally used for grinding now.

Generally, electroplated diamond flat grinding discs are used for rough grinding, while soft diamond grinding discs with resin binders are used for grinding, gradually increasing the mesh size until it reaches 3000, and then replaced with BUFF grinding discs. Then, diamond grinding paste can be applied to the cloth wheel for polishing.

Diamond particles have strong abrasive properties, and large-sized diamond fragments generated in the previous stage need to be carefully removed to avoid being carried over to the next stage of grinding, otherwise difficult to remove scratches may occur.

The above is the polishing and grinding process for sapphire phone mirrors. Although sapphire has high wear resistance and is not easily damaged, it is still necessary to avoid some high hardness materials in daily use to prevent wear and tear.