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Reasons For Wear Of Diamond Wheels
Feb 12, 2019

1. Grinding wear

In the workpiece material, a variety of high-hardness particles are often contained. During the process of sliding the abrasive grains and the workpiece, the abrasive grains are mechanically worn, and the grinding wheel is worn.

2. Oxidation wear

Commonly used abrasives are oxides, carbides and nitrides. Oxide abrasives are stable in air, and the surface of other abrasives will oxidize at high temperatures, allowing them to be gradually consumed.

3. Diffusion wear

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

4. broken by thermal stress

During the grinding process, the working surface of the abrasive particles rises to a high temperature instantaneously, and the grinding wheel is quenched under the action of the grinding fluid. The frequency of the hot and cold cycle is the same as the rotation speed of the grinding wheel, so that a large alternating current is formed on the surface of the abrasive grain. Thermal stress causes the surface of the abrasive grain to crack and break. Thermal stress damage depends primarily on the thermal conductivity of the abrasive, the coefficient of linear expansion, and the performance of the grinding fluid. The smaller the thermal conductivity is, the larger the linear expansion coefficient is, and the better the cooling performance of the grinding fluid is, the larger the thermal stress is, the easier it is to cause the abrasive particles to be cracked and broken by thermal shock. The order of thermal conductivity of various abrasives is diamond, cubic boron nitride, silicon carbide, corundum.

5. Plastic wear

Under the action of grinding high temperature, the abrasive particles will wear due to plastic deformation. Plastic wear is mainly determined by the thermal hardness of the workpiece material. During grinding, if the heat of the chips on the abrasive flank of the grinding wheel is greater than the thermal hardness of the abrasive grain contact zone, the abrasive grains are plastically worn.

The above reasons for the wear of the grinding wheel are not present in each grinding case. Depending on the abrasive, workpiece material and grinding conditions, the main causes of wear on the wheel will vary.

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