The dressing of CBN grinding wheel can be divided into two steps: Truing and Dressing. Truing is to make the grinding wheel reach the required geometric shape and dimensional accuracy by changing its macroscopic shape of the grinding wheel, and make the grinding wheel tip finely broken to form a sharp grinding edge; Dressing is to remove the binder between the grinding grains of the grinding wheel, so that the grinding grains protrude from the surface of the binder, forming the necessary chip space so that the grinding wheel has the best grinding capacity. According to the specific situation, shaping and sharpening can be unified or completed at the same time, also can be done step by step.

When the internal grinding is performed in the inner hole, and if the diameter of the grinding wheel is too large, the contact arc between the grinding wheel and the work-piece increases. It increases the grinding heat and is difficult to cool and remove the debris. If the diameter of the grinding wheel is small, it is difficult to achieve the ideal grinding speed(30m/s-50m/s), making the grinding thickness increased, the load of the abrasive grains increased, and it is easy to be blunt, and the surface roughness of the inner hole is increased.

With high efficiency, high life, high surface machining quality and environmental protection characteristics, diamond belt has been paid more and more attention in the field of hard and brittle metal materials precision machining， especially with the decrease of diamond price, its application field will be expanded gradually. There are a wide range of diamond abrasive belt products abroad, and there is a tendency to replace ordinary abrasive belts in the processing of hard and brittle materials and high-precision grinding.

Diamond honing oilstones generally use cold-pressing sintering or hot-pressing sintering. Cold pressing adopts metal mold, large forming pressure (400-500MPa), long mold life. Graphite mold is used for hot pressing, with low molding pressure (15-20MPa), low sintering temperature, small molding pressure, small loss of diamond strength, but large mold loss.

There are many cams on the camshaft of an auto engine, the rough and fine grinding of quenched cams are the key process of the cam quality. Usually, we adapt imitating shape grinding, the increasing of the workpiece speed is limited and easy to burn out. And the camber curve of cam surface is strongly affected by the diameter of grinding wheel.

When process hard cutting materials due to its different machining angle, grinding processing also enjoys more advantages!

Differences of machining hard to grind and cutting materials

Diameter of the grinding wheel is too large, the contact arc between the grinding wheel and the workpiece will increase, which will increase the grinding heat and make cooling and row cutting difficult. If the diameter of the grinding wheel is too small, it is difficult to achieve the ideal grinding speed (30m/s~50m/s), which increases the grinding thickness, increases the conformity of the grinding grains, and is easy to blunt, which increases the surface roughness of the inner hole and reduces the production efficiency when grinding the hole of workpiece.

Wheel selection is dependant on the kind of material to be ground and the type of grinding operation.