With the rapid development of the information industry, optical components are widely used in various electronic devices, and the precision and quality of their processing are becoming higher and higher. Traditional processing techniques and tools are difficult to meet their processing requirements, especially in diamond tools. Regardless of the increasingly specialized requirements of its structure and intrinsic quality, the pertinence requirements are getting stronger and stronger. Therefore, the transformation of the traditional diamond tool structure and the improvement of the internal quality in this field are becoming more and more important.
The diamond tools in this field mainly include milling grinding wheels for milling planes and spheres in roughing, edging wheels for edging, fine grinding and surface grinding in finishing, super-finished and polished sheets; Saw blades for materials, etc.
1. Main types of diamond tools for optical glass processing
Milling of optical glass is the main method of roughing, which is divided into flat and spherical milling wheels. The diameter of the surface milling grinding wheel is generally greater than 100mm, while the diameter of the spherical milling wheel is generally less than 100mm. The grinding wheel granularity is generally 60#～180#, the concentration is generally 50%～100%, and the bonding agent is bronze.
Diamond edging wheel
The diamond edging wheel is mainly used for grinding the outer circle of optical parts. The geometry and dimensions are shown in Figure 2 and Table 2. There are two kinds of bonding agents, one is electroplated nickel-based bonding agent, and the other is sintered bronze bonding. Agent. Its particle size is generally 230/270 -M28/20, the concentration is 100%-200% for electroplating, and 50%-100% for bronze.
Fine grinding disc, super fine grinding sheet
Fine and super-finished sheets are used to finish the rough-processed optical parts to fully demonstrate their optical properties. Fine grinding and super finishing have both surface and spherical processing. The fine grinding sheet generally uses a bronze, iron-based, nickel-based or cobalt-based bonding agent, and the super-fine grinding generally uses a resin organic bonding agent. The size of the refining sheet is generally 325/400～10/5, and the concentration is 100%~35%, while the superfine refining sheet is generally in the range of 14/8～7/5, and the concentration is 50%～25%.
Polishing sheets are mainly used to improve the surface finish of optical parts, ensure a certain aperture, and reduce the processing of surface deterioration layers. The main shape is like a refining sheet and a super-refining sheet, the binder is a resin, and the abrasive is cerium oxide and a small amount of diamond powder.
2. Reasonable selection of diamond products in optical glass processing
The reasonable choice of diamond products in optical glass processing mainly refers to the shape and size, bonding agent type, diamond particle size, diamond concentration and bonding agent of diamond tools according to the shape, grade, processing quality requirements and processing technology of the processed optical glass components. Select the hardness and so on. The general selection principle is: