The difference and application of MCD single crystal diamond cutting tools and ND single crystal diamond cutting tools

The difference and application of MCD single crystal diamond cutting tools and ND single crystal diamond cutting tools

Single crystal diamond tools are currently the main cutting tools in the field of ultra-precision machining. Their cutting tools generally have a mass greater than 0.1g and a minimum diameter length of not less than 2mm. They can achieve mirror processing and can process extremely high workpiece precision and extremely low surface roughness. The cutting effect is very bright and it is recognized as an ideal ultra-precision machining tool. According to the different manufacturing methods of the selected materials, they can be divided into MCD single crystal diamond tools and ND single crystal diamond tools.

1. The definition difference between MCD single crystal diamond cutting tools and ND single crystal diamond cutting tools

MCD single crystal diamond cutter: MCD is the abbreviation of Manual crystal diamond, which is what we usually call artificial single crystal diamond or artificial diamond for short. It is a material grown through chemical crystallization under high temperature and high pressure.

Synthetic diamond is one of the type Ib single crystal synthetic diamonds. Nitrogen [N] is mostly dispersed or solid solution exists inside the crystal. As the name suggests, synthetic single crystal diamond is artificially synthesized in an oxygen-free and high-temperature environment (above 1000°C). ) is synthesized in a high-pressure environment and has high hardness, high wear resistance and high thermal conductivity comparable to diamond.Since it is a single crystal like diamond, its grain-boundary-free nature can produce very sharp blade quality, which is a level that other materials cannot achieve. It has long been used in the production of ultra-precision machining diamond tools, polishing tools and wear-resistant components. The current maximum size of artificial single crystal diamond can reach 8mm.

ND single crystal diamond cutter: Select high-quality natural diamond, use special welding technology to weld the natural diamond single crystal to the cutter holder, make it through special geometric angle design and sharpening technology, and process it into various angles and radians according to customer requirements.

About 98% of natural diamonds belong to type Ia nitrogen [N] (~2500ppm). Most of the natural diamonds are formed in rocks that are at least 2.5 billion years old, and are formed about 140 to 200 kilometers underground. At this depth Strong pressure (1.5 million pounds per square leaf) and extremely high temperatures (about 2800°C) cause rare carbon atoms to gather tightly together to form a crystal structure.After a volcanic eruption, intense energy violently pushed against ancient rocks containing diamonds, which were then quickly carried to the surface by magma or molten stone.Because diamond has high hardness, high wear resistance and high thermal conductivity, it has been used in cutting tools for a long time. In recent years, with the advancement of science and technology, the requirements for processing quality and error of the workpiece have been increased, and the characteristics of diamond have been widely used. Used in the processing of optical components.

2. The color difference between MCD single crystal diamond cutting tools and ND single crystal diamond cutting tools

MCD materials generally have two colors, one is nearly transparent and the other is light yellow. The production process of these two colors of single crystal diamond materials is the same, but the nitrogen remaining in the material is different.Transparent particles have very low nitrogen content and are closer to natural single crystal diamond. In practical applications, if they are made into tools, they can achieve a higher smoothness and at the same time, the tool life is better. Therefore, the price of transparent MCD single crystal diamond tools is also higher, and the production capacity is not as large as that of light yellow single crystal diamond tools.

ND single crystal diamond is transparent in color, the price of the tool is higher than that of artificial single crystal tool, and it can achieve higher precision and smoothness.

3. The application differences between MCD single crystal diamond tools and ND single crystal diamond tools

MCD single crystal diamond cutting tools, synthetic single crystals have good consistency in size, shape and performance, providing excellent wear resistance and longer tool life in precision applications. It can be used as a cutting tool for processing non-ferrous metals and non-metal materials. It is mainly used for processing non-ferrous metals, such as aluminum, copper, gold and other non-ferrous metals, acrylic, etc. Because the hardness of the tool itself is particularly high, it can achieve a very high finish. Currently, due to improvements in tool processing equipment and new processing technology, MCD single crystal diamond tools can not only be made into simple single crystal turning tools and single crystal chamfering tools. , you can also make special-shaped single crystal contour tools

ND single crystal diamond tools are expensive and are generally used for ultra-precision cutting of certain non-ferrous metals or the production of gold jewelry. Mainly used in the optical field, which requires very high precision and smoothness.Natural diamonds are harder than artificial diamonds, have better wear resistance, and can obtain better processing results.