Diamond and CBN Abrasive Grain Size Control
Mesh refers to the number of holes on the screen per square inch, 50 mesh means 50 holes per square inch, 500 mesh is 500, the higher the mesh, the more the holes, and the smaller the abrasive particle size. The finer the granularity. The filter screen divides the abrasive grains into different sizes.
One square inch of 36 mesh filter is divided into 36 □ 36 small squares, and one square inch of 80 mesh filter is divided into 80 □ 80 small squares.
The choice of abrasive grain size is related to the nature of the workpiece and the grinding process parameters, especially the surface roughness of the workpiece after grinding, the feed rate, and the maximum single-cut depth of cut.
The long particles in the picture, the width does not exceed the standard, but the length exceeds the standard, this kind of particles will also leak down the screen and mix into the 120/140 abrasive. The grinding wheel will easily cause scratches on the workpiece. If the fine-grained grinding wheel used for fine grinding causes scratches on the workpiece, the workpiece will be scrapped. Therefore, W10 and coarse-grained particles can generally be sieved several times to reduce long strips and flakes, while W10 fine-grained fine powders generally reduce long strips and large particles by increasing the number of sedimentation. The quality of the screen must be qualified.
In the use of screening equipment, the screen is a vulnerable part, and it must be replaced frequently, some even in less than three days. The so-called unqualified vibrating screen not only refers to the quality of the screen, but also the number of screen meshes. In line with national standards. Although it is generally difficult for users to judge the size of the mesh by themselves, the effect of the screening of materials will still be measured. If they reach their satisfaction, then the screen must be qualified.
"Grain size" is directly related to the grinding quality, especially the surface roughness. For abrasives of the same particle size, the sharper the abrasive grains, the higher the processing efficiency, and the rounder the processed surface quality is (the smaller the surface roughness value). Generally, round particles are stronger than sharp ones. The strength of the abrasive is related to the compactness of the crystal structure of the abrasive itself, that is, the ability to withstand external pressure without being broken when the edge of the abrasive grain is still quite sharp. Abrasives with poor strength have fast grinding particles, low cutting ability and short service life. In order to obtain better grinding processing, this requires abrasive grains to have sufficient strength. A piece of super hard grinding wheel not only needs round abrasive grains to ensure the surface quality of the processing, but also needs relatively sharp abrasive grains to improve its processing efficiency. We have been working hard for this!