Diamond grinding wheel is a circular bonded abrasive with a through hole in the center made of diamond abrasive as raw material, metal powder, resin powder, ceramic and electroplated metal as binders. However, diamond grinding wheel will also be worn during work. Here are some reasons for the wear of diamond grinding wheel for you to learn more about. In order to extend the service life of diamond grinding wheel, in addition to certain requirements for the quality of grinding wheel, daily use and maintenance are also very important.

1. Abrasion wear

In the workpiece material, there are often a variety of high-hardness particles. In the relative sliding process between the abrasive and the workpiece, the abrasive will be mechanically worn, so that the diamond grinding wheel will be worn.

2. Diffusion wear

It refers to the wear caused by the mutual diffusion of elements of diamond grinding wheel when the abrasive and the material being ground contact at high temperature, causing the surface layer of the abrasive to weaken. The mutual diffusion of elements between the two materials is closely related to the chemical composition of the materials. Since the ability of carbon in diamond abrasive to diffuse and dissolve in iron is greater than that of elements in boron nitride abrasive to diffuse and dissolve in iron, diamond grinding wheels are not suitable for grinding steel.

3. Thermal stress damage

During the grinding process, the working surface of the abrasive grains rises to a high temperature instantly, and the diamond grinding wheel is rapidly cooled under the action of the grinding fluid. The frequency of its hot and cold cycles is the same as the rotation speed of the grinding wheel, thus forming a large alternating thermal stress on the surface of the abrasive grains, causing the surface of the abrasive grains to crack and break. Thermal stress damage mainly depends on the thermal conductivity parameters, linear expansion coefficient and performance of the grinding fluid of the abrasive. The smaller the thermal conductivity coefficient, the larger the linear expansion coefficient, and the better the cooling performance of the grinding fluid, the greater the thermal stress, and the easier it is for the abrasive grains to crack and break due to thermal shock. The order of thermal conductivity of various abrasives is diamond, cubic boron nitride, silicon carbide, and corundum.

4. Oxidative wear

Common abrasives include oxides, carbides and nitrides. Oxide abrasives are stable in the air, while the surfaces of other abrasives will be oxidized at high temperatures, causing them to gradually consume.

5. Plastic wear

Under the high temperature of grinding, the abrasive grains will wear due to plastic deformation. Plastic wear mainly depends on the thermal hardness of the workpiece material. During grinding, if the thermal hardness of the diamond grinding wheel chips on the front cutting edge of the abrasive grains is greater than the thermal hardness of the abrasive grain contact area, the abrasive grains will undergo plastic wear.