As the materials that need to be ground become more refined, various grinding wheels are constantly being updated. Traditional corundum grinding wheels and diamond grinding wheels are no longer sufficient to meet all grinding requirements. Many people on the market now choose CBN (cubic boron nitride) grinding wheels, but more people don’t know what a CBN grinding wheel is or what the benefits of a CBN grinding wheel are.
CBN (cubic boron nitride) is a superhard material synthesized by humans. Its hardness is second only to diamond and much higher than ordinary corundum and silicon carbide abrasives. Many people who come into contact with it for the first time will directly equate it with diamond. In fact, this is a misunderstanding. Compared with diamond, CBN still has many advantages that diamond cannot match. First of all, CBN has the characteristics of high temperature resistance and good thermal stability. CBN can withstand high temperatures of 1250-1350 degrees Celsius, which is higher than diamond’s heat resistance of 800 degrees Celsius. When grinding and cutting ferrous materials, there will be no chip sticking phenomenon. It is the most ideal grinding wheel for grinding quenched steel, high-vanadium high-speed steel, aluminum high-speed steel and other metal materials that are sensitive to grinding temperature. Secondly, the chemical inertness of CBN grinding wheels is very strong. Cubic boron nitride does not easily react chemically with iron group elements, so it can replace diamond for various high-speed steels, tool steels, grinding steels, high-alloy hardened steels, and chromium steels. It is very suitable for grinding materials with high temperature, high hardness and low thermal conductivity, such as nickel alloy, powder metallurgy and high temperature alloy. Therefore, when processing the above-mentioned iron group element materials, the durability is 3-5 times higher than that of diamond grinding wheels. If conditions permit, CBN grinding wheels can be used instead of ordinary grinding wheels for grinding hard steel, especially for grinding high-speed tool steel. The cost is lower and the use is more cost-effective.
Grinding wheels made of CBN abrasives can be divided into the following four types according to different processing techniques and binders with different components. Their properties and uses (referring to machining purposes) also differ. The first type is electroplated CBN grinding wheel, which is characterized by simple process, low production cost and simple molding. However, there is only one layer of coating, which cannot be corrected. During the processing, it is difficult to know when the grinding layer is damaged. It is suitable for machining of small batches and grinding of complex geometric shapes and used as a dressing roller. The second type is sintered CBN grinding wheel, which is characterized by high hardness and high density. It is costly to process into a high-precision dressing roller. Mainly used for dressing rollers of grinding wheels and processing of large quantities of super-hard materials. The third type is the resin CBN grinding wheel. The production process of the grinding wheel is simple and the production cost is low. The molding is simple but difficult to correct and shape. Used for processing multiple shapes and small batches. Such as tool grinding and tool processing, glass processing. The last one is the ceramic bond CBN grinding wheel, which is characterized by strong grinding force, high-speed processing without burning the workpiece, correction and durability, etc. It is currently the most ideal high-speed, efficient and high-precision grinding tool.