How to choose the appropriate CBN grinding wheel hardness? The hardness of the grinding wheel refers to the difficulty for the abrasive particles on the grinding wheel to fall off during grinding. We generally call it the hardness of the grinding wheel. Grinding wheels of different hardness are suitable for grinding different workpieces. If the grinding wheel is too soft, it will cause the grinding grains to fall off too fast to play its full role. The larger the contact surface between the grinding wheel and the workpiece, the softer the grinding wheel will be. On the contrary, the higher the hardness of the grinding wheel will be. The harder the workpiece, the softer the grinding wheel. The softer the workpiece, the harder the grinding wheel. In fine grinding and shape grinding, a hard wheel should be selected to maintain the necessary shape accuracy of the wheel. The hardness of the grinding wheel with coolant is 1~2 smaller stages higher than that of the dry grinding wheel; The larger the grinding wheel size, in order to avoid the grinding wheel being blocked by debris, generally choose a softer grinding wheel; Under the same grinding condition, the hardness of resin bonded grinding wheel is 1~2 small grades higher than that of ceramic bonded grinding wheel. Compared with circumferential grinding, the end grinding wheel should be softer. When the grinding wheel rotates at a high speed, the hardness of the grinding wheel can be selected as soft 1~2 small levels. The soft grinding wheel should be selected for the workpiece with poor thermal conductivity. When grinding soft and ductile non-ferrous metals, the hardness should be softer.

CBN grinding wheel processing object. Suitable for processing products with the following materials: high manganese steel; High chromium, nickel and molybdenum alloy steel; Chilled cast iron (HS80 ~ 90); All kinds of hardened steel (HRC55 ~ 65); All kinds of cast iron (HB200 ~ 400), etc., and has been in the domestic automobile (gear, flywheel, shaft, bearing and other processing), roller, slurry pump (impeller, vortex shell, plate, sheath and other processing), mold, cylinder liner; Glass, gemstone and other high hardness soft and tough materials, solve the machining of high hardness in all walks of life difficult to process materials, and can improve work efficiency, greatly save processing hours and electricity, and obtain huge economic benefits.

Super hard abrasive wheel made of diamond or cubic boron nitride (CBN) abrasive has been widely used in all aspects of grinding field due to its excellent grinding performance. Diamond grinding wheel is a tool for grinding hard and brittle materials such as hard alloy, glass, ceramic and precious stone. In recent years, along with the rapid development of grinding and super high speed grinding technology, higher requirements are put forward for grinding wheel, diamond ceramics and resin grinding wheel cannot meet the needs of all production, metal bond grinding wheel because of its high bonding strength and good formability, long life and other significant features and has been widely used in the production. There are two types of metal-bonded diamond grinding wheels, sintering and electroplating, according to different manufacturing methods.

In order to give full play to the role of super hard abrasive, a new grinding wheel, namely single-layer high temperature brazing super hard abrasive grinding wheel, has been developed in foreign countries since the early 1990s by using high temperature brazing technology. At present, this grinding wheel is still in the development stage in China. Sintered diamond grinding wheel sintered metal bonding agent grinding wheel mostly USES bronze and other metals as the bonding agent, and is manufactured by high temperature sintering method. It has high bonding strength, good molding property, high temperature resistance, good thermal conductivity and wear resistance, long service life, and can bear a large load.