Characteristics of Resin Bonded CBN Grinding Wheels

Resin-bonded CBN grinding wheels use organic polymer compounds as binders to consolidate CBN abrasive grains together to form a grinding tool with a certain rigidity (strength and hardness). Resin bond CBN grinding wheel can process various metal materials and non-metal materials, especially in the field of fine grinding and polishing, it has excellent processing characteristics; it is suitable for grinding workpieces such as high-speed steel, cast iron, stainless steel and nitrided stainless steel. It is increasingly replacing ordinary abrasive tools, and is widely used in precision grinding of workpieces containing iron group elements in industries or fields such as automobiles, bearings, compressors and precision molds. It is an irreplaceable tool in grinding processing.

The resin-bonded CBN grinding wheel has a wide range of applications and has been applied in the grinding process of coarse, fine, fine, and polishing. The resin-bonded CBN grinding wheel has the following characteristics:

(1) High bonding strength. Compared with vitrified bond, resin bond CBN grinding wheel has high bonding strength, and its resin grinding wheel has a grinding linear speed of 80~120m/s, and can withstand greater grinding pressure.

(2) It has a certain elasticity. Compared with the vitrified CBN grinding wheel, the resin bonded grinding wheel has good toughness, certain plasticity and ductility, and is suitable for the preparation of various specifications of thin-film grinding wheels and high-speed cutting grinding wheels. Due to a certain elastic deformation, it can buffer the effect of grinding force, so the grinding effect is good, the polishing effect can be improved, and the roughness of the machined surface can be improved.

(3) Abrasives with various complex shapes and special requirements can be made. Due to the low hardening temperature of the resin bond CBN grinding wheel, it can be hardened at room temperature and has a small shrinkage rate, so it can be made into grinding wheels with various complex shapes and special requirements.

(4) It is beneficial to prevent the workpiece being ground from being burnt. The heat resistance of the resin bond is low, and the heat generated by the workpiece during the grinding process causes the resin to carbonize, and promotes the passivated abrasive to fall off automatically, exposing new sharp abrasive particles, reducing the heat in the grinding area and avoiding burns on the workpiece. .

(5) The hardening temperature is low. Resin CBN grinding wheel has low hardening temperature, short production cycle and simple equipment, which is conducive to specialized production.

However, compared with other bond grinding wheels, the disadvantages of resin bond CBN grinding wheels are: poor alkali resistance, poor water resistance, and easy aging; low heat resistance, high wear during grinding, and unsuitable for shaping Grinding; low porosity, processing odor, easy to cause environmental pollution problems.

CBN abrasives are the dominant factor in grinding. The CBN abrasives selected for resin-bonded CBN grinding wheels often have the following common characteristics: ①The crystal shape is irregular, and most of the particles are non-equal area. ②The surface of the grain is rough and not smooth. ③ Low strength and high brittleness. ④ poor thermal stability. CBN abrasives with these characteristics are suitable for the manufacture of resin-bonded grinding wheels. The reasons are: 1. The resin has a weak grip on the abrasive, and the abrasive surface is rough and irregular in shape, which is conducive to mechanical engagement with the resin; 2. The strength of the resin bond itself Low temperature, low manufacturing and use temperature, high strength and heat resistance of abrasives are not required, brittle grains only need low working pressure (normal grinding force) in grinding to be micro-edge fracture, showing Good self-sharpening, which is the fundamental reason for the low grinding force and low grinding temperature of the resin grinding wheel.