Abrasive basic properties

Abrasive should have the following basic properties: ① high hardness, should generally be higher than the material to be processed; ② appropriate strength, but also a sharp cutting edge in the grain can withstand cutting forces without fragmentation, when cut to a certain  abrasive wheels  extent exposed to partial fragmentation of new sharp edges; ③ high temperature stability, in the grinding temperature can maintain its inherent hardness and strength; ④ chemical inertness, and being easy to produce a chemical reaction processing of materials. These properties and the chemical  Polycrystalline diamond of the abrasive, mineral composition, crystal morphology and integrity of the crystal and so on.
The thickness of the abrasive particles in said particle. Graded by sieving particles, the particle size is usually sieved through the sieve of the finest mesh representation. If appropriate side through a 20-per-inch mesh screen and pass under the adjacent sieve One, known as the 20th granularity. Particle number is larger, finer particles. The abrasive particle size less than 63 microns is called powder, generally based on water or air classification sedimentation method. Abrasive grains are usually composed of a number of "particle group" for the product, each level of granularity with which the particle swarm primary particle size range to that if the size number 28/20 powder, referring to the primary particle size of 28 ~ 20 microns. Thickness of the abrasive particle size, the surface quality of the workpiece by grinding and processing efficiency are greatly affected. When the workpiece machining allowance, demanding to improve processing efficiency without requiring high surface quality, the choice of coarse granularity; contrary, should be used in relatively fine-grained.